File 0001-Update-google.golang.org-grpc-to-1.56.3.patch of Package kubevirt

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File 0001-Update-google.golang.org-grpc-to-1.56.3.patch of Package kubevirt (Revision 13bf16cacab14e3493c421e7346a4edb)

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From ad6d2dc3f73aaf37b892ef58209902ec519b6edc Mon Sep 17 00:00:00 2001
From: Michael Henriksen <mhenriks@redhat.com>
Date: Thu, 2 Nov 2023 21:13:48 -0400
Subject: [PATCH] Update google.golang.org/grpc to 1.56.3

Address CVE-2023-44487

Signed-off-by: Michael Henriksen <mhenriks@redhat.com>
---
 go.mod                                        |  10 +-
 go.sum                                        |  13 +-
 .../github.com/cespare/xxhash/v2/BUILD.bazel  |   3 +-
 vendor/github.com/cespare/xxhash/v2/README.md |  31 +-
 .../github.com/cespare/xxhash/v2/testall.sh   |  10 +
 vendor/github.com/cespare/xxhash/v2/xxhash.go |  47 +-
 .../cespare/xxhash/v2/xxhash_amd64.s          | 336 ++++----
 .../cespare/xxhash/v2/xxhash_arm64.s          | 183 ++++
 .../v2/{xxhash_amd64.go => xxhash_asm.go}     |   2 +
 .../cespare/xxhash/v2/xxhash_other.go         |  22 +-
 .../cespare/xxhash/v2/xxhash_safe.go          |   1 +
 .../cespare/xxhash/v2/xxhash_unsafe.go        |   3 +-
 .../x/net/context/ctxhttp/BUILD.bazel         |   9 -
 .../x/net/context/ctxhttp/ctxhttp.go          |  71 --
 vendor/golang.org/x/oauth2/AUTHORS            |   3 -
 vendor/golang.org/x/oauth2/CONTRIBUTORS       |   3 -
 vendor/golang.org/x/oauth2/README.md          |  12 +-
 .../golang.org/x/oauth2/internal/BUILD.bazel  |   1 -
 vendor/golang.org/x/oauth2/internal/token.go  |   4 +-
 vendor/golang.org/x/oauth2/oauth2.go          |  33 +-
 vendor/golang.org/x/oauth2/token.go           |  14 +-
 .../googleapis/rpc/status/status.pb.go        |  10 +-
 vendor/google.golang.org/grpc/CONTRIBUTING.md |  25 +-
 .../grpc/attributes/attributes.go             |  31 +-
 vendor/google.golang.org/grpc/backoff.go      |   2 +-
 .../grpc/balancer/balancer.go                 |  33 +-
 .../grpc/balancer/base/balancer.go            |   4 +-
 .../grpc/balancer/conn_state_evaluator.go     |  12 +-
 .../grpc/balancer/roundrobin/roundrobin.go    |  16 +-
 .../grpc/balancer_conn_wrappers.go            | 529 ++++++------
 .../grpc_binarylog_v1/binarylog.pb.go         |  22 +-
 vendor/google.golang.org/grpc/call.go         |   5 +
 .../grpc/channelz/channelz.go                 |   2 +-
 vendor/google.golang.org/grpc/clientconn.go   | 798 +++++++++++-------
 .../grpc/codes/code_string.go                 |  51 +-
 .../grpc/credentials/credentials.go           |  20 +-
 .../google.golang.org/grpc/credentials/tls.go |   6 +-
 vendor/google.golang.org/grpc/dialoptions.go  |  87 +-
 .../grpc/encoding/encoding.go                 |   7 +-
 .../grpc/grpclog/loggerv2.go                  |   9 +-
 vendor/google.golang.org/grpc/idle.go         | 287 +++++++
 .../grpc/internal/binarylog/binarylog.go      |  31 +-
 .../grpc/internal/binarylog/env_config.go     |  20 +-
 .../grpc/internal/binarylog/method_logger.go  | 153 ++--
 .../grpc/internal/binarylog/sink.go           |  12 +-
 .../grpc/internal/buffer/unbounded.go         |  26 +-
 .../grpc/internal/channelz/types.go           |  16 +-
 .../grpc/internal/envconfig/envconfig.go      |  43 +-
 .../grpc/internal/envconfig/observability.go  |  42 +
 .../grpc/internal/envconfig/xds.go            |  51 +-
 .../grpc/internal/grpclog/grpclog.go          |   2 +-
 .../grpc/internal/grpclog/prefixLogger.go     |  12 +
 .../grpc/internal/grpcrand/grpcrand.go        |  21 +
 .../internal/grpcsync/callback_serializer.go  | 119 +++
 .../grpc/internal/grpcsync/oncefunc.go        |  32 +
 .../grpc/internal/grpcutil/compressor.go      |  47 ++
 .../grpc/internal/grpcutil/method.go          |   1 -
 .../grpc/internal/internal.go                 |  77 +-
 .../grpc/internal/metadata/metadata.go        |  62 +-
 .../internal/resolver/dns/dns_resolver.go     |   6 +-
 .../resolver/passthrough/passthrough.go       |  11 +-
 .../grpc/internal/resolver/unix/unix.go       |   9 +-
 .../grpc/internal/serviceconfig/duration.go   | 130 +++
 .../internal/serviceconfig/serviceconfig.go   |   8 +-
 .../grpc/internal/status/status.go            |  10 +
 .../grpc/internal/transport/controlbuf.go     | 131 +--
 .../grpc/internal/transport/defaults.go       |   6 +
 .../grpc/internal/transport/handler_server.go |  60 +-
 .../grpc/internal/transport/http2_client.go   | 314 ++++---
 .../grpc/internal/transport/http2_server.go   | 248 +++---
 .../grpc/internal/transport/http_util.go      |  49 +-
 .../grpc/internal/transport/logging.go        |  40 +
 .../grpc/internal/transport/transport.go      |  41 +-
 .../grpc/metadata/metadata.go                 |  86 +-
 .../google.golang.org/grpc/picker_wrapper.go  |  69 +-
 vendor/google.golang.org/grpc/pickfirst.go    |  58 +-
 vendor/google.golang.org/grpc/preloader.go    |   2 +-
 vendor/google.golang.org/grpc/regenerate.sh   |   7 +-
 .../grpc/resolver/resolver.go                 |  72 +-
 .../grpc/resolver_conn_wrapper.go             | 229 +++--
 vendor/google.golang.org/grpc/rpc_util.go     | 109 ++-
 vendor/google.golang.org/grpc/server.go       | 450 +++++++---
 .../google.golang.org/grpc/service_config.go  |  83 +-
 .../grpc/serviceconfig/serviceconfig.go       |   2 +-
 vendor/google.golang.org/grpc/stats/stats.go  |  22 +-
 .../google.golang.org/grpc/status/status.go   |  61 +-
 vendor/google.golang.org/grpc/stream.go       | 237 ++++--
 vendor/google.golang.org/grpc/tap/tap.go      |   2 +-
 vendor/google.golang.org/grpc/version.go      |   2 +-
 vendor/google.golang.org/grpc/vet.sh          |  40 +-
 vendor/modules.txt                            |  15 +-
 91 files changed, 4169 insertions(+), 1974 deletions(-)
 create mode 100644 vendor/github.com/cespare/xxhash/v2/testall.sh
 create mode 100644 vendor/github.com/cespare/xxhash/v2/xxhash_arm64.s
 rename vendor/github.com/cespare/xxhash/v2/{xxhash_amd64.go => xxhash_asm.go} (73%)
 delete mode 100644 vendor/golang.org/x/net/context/ctxhttp/BUILD.bazel
 delete mode 100644 vendor/golang.org/x/net/context/ctxhttp/ctxhttp.go
 delete mode 100644 vendor/golang.org/x/oauth2/AUTHORS
 delete mode 100644 vendor/golang.org/x/oauth2/CONTRIBUTORS
 create mode 100644 vendor/google.golang.org/grpc/idle.go
 create mode 100644 vendor/google.golang.org/grpc/internal/envconfig/observability.go
 create mode 100644 vendor/google.golang.org/grpc/internal/grpcsync/callback_serializer.go
 create mode 100644 vendor/google.golang.org/grpc/internal/grpcsync/oncefunc.go
 create mode 100644 vendor/google.golang.org/grpc/internal/grpcutil/compressor.go
 create mode 100644 vendor/google.golang.org/grpc/internal/serviceconfig/duration.go
 create mode 100644 vendor/google.golang.org/grpc/internal/transport/logging.go

diff --git a/go.mod b/go.mod
index c4adee251..1ae36f932 100644
--- a/go.mod
+++ b/go.mod
@@ -16,7 +16,7 @@ require (
 	github.com/go-openapi/strfmt v0.20.0
 	github.com/go-openapi/validate v0.20.2
 	github.com/gogo/protobuf v1.3.2
-	github.com/golang/glog v1.0.0
+	github.com/golang/glog v1.1.0
 	github.com/golang/mock v1.6.0
 	github.com/golang/protobuf v1.5.3
 	github.com/google/go-github/v32 v32.0.0
@@ -64,7 +64,7 @@ require (
 	golang.org/x/term v0.12.0
 	golang.org/x/time v0.3.0
 	golang.org/x/tools v0.13.0
-	google.golang.org/grpc v1.49.0
+	google.golang.org/grpc v1.56.3
 	gopkg.in/cheggaaa/pb.v1 v1.0.28
 	gopkg.in/yaml.v2 v2.4.0
 	k8s.io/api v0.27.1
@@ -90,7 +90,7 @@ require (
 	github.com/VividCortex/ewma v1.2.0 // indirect
 	github.com/asaskevich/govalidator v0.0.0-20200907205600-7a23bdc65eef // indirect
 	github.com/beorn7/perks v1.0.1 // indirect
-	github.com/cespare/xxhash/v2 v2.1.2 // indirect
+	github.com/cespare/xxhash/v2 v2.2.0 // indirect
 	github.com/cilium/ebpf v0.7.0 // indirect
 	github.com/coreos/go-systemd/v22 v22.4.0 // indirect
 	github.com/cyphar/filepath-securejoin v0.2.3 // indirect
@@ -145,10 +145,10 @@ require (
 	go.mongodb.org/mongo-driver v1.8.4 // indirect
 	golang.org/x/exp/typeparams v0.0.0-20230203172020-98cc5a0785f9 // indirect
 	golang.org/x/mod v0.12.0 // indirect
-	golang.org/x/oauth2 v0.0.0-20220223155221-ee480838109b // indirect
+	golang.org/x/oauth2 v0.7.0 // indirect
 	golang.org/x/text v0.13.0 // indirect
 	google.golang.org/appengine v1.6.7 // indirect
-	google.golang.org/genproto v0.0.0-20220720214146-176da50484ac // indirect
+	google.golang.org/genproto v0.0.0-20230410155749-daa745c078e1 // indirect
 	google.golang.org/protobuf v1.30.0 // indirect
 	gopkg.in/inf.v0 v0.9.1 // indirect
 	gopkg.in/tomb.v1 v1.0.0-20141024135613-dd632973f1e7 // indirect
diff --git a/go.sum b/go.sum
index f822c8405..0c551e9d7 100644
--- a/go.sum
+++ b/go.sum
@@ -167,8 +167,9 @@ github.com/cespare/xxhash v0.0.0-20181017004759-096ff4a8a059/go.mod h1:XrSqR1Vqq
 github.com/cespare/xxhash v1.1.0/go.mod h1:XrSqR1VqqWfGrhpAt58auRo0WTKS1nRRg3ghfAqPWnc=
 github.com/cespare/xxhash/v2 v2.1.0/go.mod h1:dgIUBU3pDso/gPgZ1osOZ0iQf77oPR28Tjxl5dIMyVM=
 github.com/cespare/xxhash/v2 v2.1.1/go.mod h1:VGX0DQ3Q6kWi7AoAeZDth3/j3BFtOZR5XLFGgcrjCOs=
-github.com/cespare/xxhash/v2 v2.1.2 h1:YRXhKfTDauu4ajMg1TPgFO5jnlC2HCbmLXMcTG5cbYE=
 github.com/cespare/xxhash/v2 v2.1.2/go.mod h1:VGX0DQ3Q6kWi7AoAeZDth3/j3BFtOZR5XLFGgcrjCOs=
+github.com/cespare/xxhash/v2 v2.2.0 h1:DC2CZ1Ep5Y4k3ZQ899DldepgrayRUGE6BBZ/cd9Cj44=
+github.com/cespare/xxhash/v2 v2.2.0/go.mod h1:VGX0DQ3Q6kWi7AoAeZDth3/j3BFtOZR5XLFGgcrjCOs=
 github.com/cheggaaa/pb/v3 v3.1.0 h1:3uouEsl32RL7gTiQsuaXD4Bzbfl5tGztXGUvXbs4O04=
 github.com/cheggaaa/pb/v3 v3.1.0/go.mod h1:YjrevcBqadFDaGQKRdmZxTY42pXEqda48Ea3lt0K/BE=
 github.com/chzyer/logex v1.1.10/go.mod h1:+Ywpsq7O8HXn0nuIou7OrIPyXbp3wmkHB+jjWRnGsAI=
@@ -1429,8 +1430,9 @@ golang.org/x/oauth2 v0.0.0-20210628180205-a41e5a781914/go.mod h1:KelEdhl1UZF7XfJ
 golang.org/x/oauth2 v0.0.0-20210805134026-6f1e6394065a/go.mod h1:KelEdhl1UZF7XfJ4dDtk6s++YSgaE7mD/BuKKDLBl4A=
 golang.org/x/oauth2 v0.0.0-20210819190943-2bc19b11175f/go.mod h1:KelEdhl1UZF7XfJ4dDtk6s++YSgaE7mD/BuKKDLBl4A=
 golang.org/x/oauth2 v0.0.0-20211104180415-d3ed0bb246c8/go.mod h1:KelEdhl1UZF7XfJ4dDtk6s++YSgaE7mD/BuKKDLBl4A=
-golang.org/x/oauth2 v0.0.0-20220223155221-ee480838109b h1:clP8eMhB30EHdc0bd2Twtq6kgU7yl5ub2cQLSdrv1Dg=
 golang.org/x/oauth2 v0.0.0-20220223155221-ee480838109b/go.mod h1:DAh4E804XQdzx2j+YRIaUnCqCV2RuMz24cGBJ5QYIrc=
+golang.org/x/oauth2 v0.7.0 h1:qe6s0zUXlPX80/dITx3440hWZ7GwMwgDDyrSGTPJG/g=
+golang.org/x/oauth2 v0.7.0/go.mod h1:hPLQkd9LyjfXTiRohC/41GhcFqxisoUQ99sCUOHO9x4=
 golang.org/x/sync v0.0.0-20180314180146-1d60e4601c6f/go.mod h1:RxMgew5VJxzue5/jJTE5uejpjVlOe/izrB70Jof72aM=
 golang.org/x/sync v0.0.0-20181108010431-42b317875d0f/go.mod h1:RxMgew5VJxzue5/jJTE5uejpjVlOe/izrB70Jof72aM=
 golang.org/x/sync v0.0.0-20181221193216-37e7f081c4d4/go.mod h1:RxMgew5VJxzue5/jJTE5uejpjVlOe/izrB70Jof72aM=
@@ -1793,8 +1795,8 @@ google.golang.org/genproto v0.0.0-20210903162649-d08c68adba83/go.mod h1:eFjDcFEc
 google.golang.org/genproto v0.0.0-20210924002016-3dee208752a0/go.mod h1:5CzLGKJ67TSI2B9POpiiyGha0AjJvZIUgRMt1dSmuhc=
 google.golang.org/genproto v0.0.0-20211118181313-81c1377c94b1/go.mod h1:5CzLGKJ67TSI2B9POpiiyGha0AjJvZIUgRMt1dSmuhc=
 google.golang.org/genproto v0.0.0-20220502173005-c8bf987b8c21/go.mod h1:RAyBrSAP7Fh3Nc84ghnVLDPuV51xc9agzmm4Ph6i0Q4=
-google.golang.org/genproto v0.0.0-20220720214146-176da50484ac h1:EOa+Yrhx1C0O+4pHeXeWrCwdI0tWI6IfUU56Vebs9wQ=
-google.golang.org/genproto v0.0.0-20220720214146-176da50484ac/go.mod h1:GkXuJDJ6aQ7lnJcRF+SJVgFdQhypqgl3LB1C9vabdRE=
+google.golang.org/genproto v0.0.0-20230410155749-daa745c078e1 h1:KpwkzHKEF7B9Zxg18WzOa7djJ+Ha5DzthMyZYQfEn2A=
+google.golang.org/genproto v0.0.0-20230410155749-daa745c078e1/go.mod h1:nKE/iIaLqn2bQwXBg8f1g2Ylh6r5MN5CmZvuzZCgsCU=
 google.golang.org/grpc v1.16.0/go.mod h1:0JHn/cJsOMiMfNA9+DeHDlAU7KAAB5GDlYFpa9MZMio=
 google.golang.org/grpc v1.17.0/go.mod h1:6QZJwpn2B+Zp71q/5VxRsJ6NXXVCE5NRUHRo+f3cWCs=
 google.golang.org/grpc v1.19.0/go.mod h1:mqu4LbDTu4XGKhr4mRzUsmM4RtVoemTSY81AxZiDr8c=
@@ -1833,8 +1835,9 @@ google.golang.org/grpc v1.41.0/go.mod h1:U3l9uK9J0sini8mHphKoXyaqDA/8VyGnDee1zzI
 google.golang.org/grpc v1.42.0/go.mod h1:k+4IHHFw41K8+bbowsex27ge2rCb65oeWqe4jJ590SU=
 google.golang.org/grpc v1.46.0/go.mod h1:vN9eftEi1UMyUsIF80+uQXhHjbXYbm0uXoFCACuMGWk=
 google.golang.org/grpc v1.46.2/go.mod h1:vN9eftEi1UMyUsIF80+uQXhHjbXYbm0uXoFCACuMGWk=
-google.golang.org/grpc v1.49.0 h1:WTLtQzmQori5FUH25Pq4WT22oCsv8USpQ+F6rqtsmxw=
 google.golang.org/grpc v1.49.0/go.mod h1:ZgQEeidpAuNRZ8iRrlBKXZQP1ghovWIVhdJRyCDK+GI=
+google.golang.org/grpc v1.56.3 h1:8I4C0Yq1EjstUzUJzpcRVbuYA2mODtEmpWiQoN/b2nc=
+google.golang.org/grpc v1.56.3/go.mod h1:I9bI3vqKfayGqPUAwGdOSu7kt6oIJLixfffKrpXqQ9s=
 google.golang.org/grpc/cmd/protoc-gen-go-grpc v1.1.0/go.mod h1:6Kw0yEErY5E/yWrBtf03jp27GLLJujG4z/JK95pnjjw=
 google.golang.org/protobuf v0.0.0-20200109180630-ec00e32a8dfd/go.mod h1:DFci5gLYBciE7Vtevhsrf46CRTquxDuWsQurQQe4oz8=
 google.golang.org/protobuf v0.0.0-20200221191635-4d8936d0db64/go.mod h1:kwYJMbMJ01Woi6D6+Kah6886xMZcty6N08ah7+eCXa0=
diff --git a/vendor/github.com/cespare/xxhash/v2/BUILD.bazel b/vendor/github.com/cespare/xxhash/v2/BUILD.bazel
index 9021f3c5d..2bfb7768d 100644
--- a/vendor/github.com/cespare/xxhash/v2/BUILD.bazel
+++ b/vendor/github.com/cespare/xxhash/v2/BUILD.bazel
@@ -4,8 +4,9 @@ go_library(
     name = "go_default_library",
     srcs = [
         "xxhash.go",
-        "xxhash_amd64.go",
         "xxhash_amd64.s",
+        "xxhash_arm64.s",
+        "xxhash_asm.go",
         "xxhash_other.go",
         "xxhash_unsafe.go",
     ],
diff --git a/vendor/github.com/cespare/xxhash/v2/README.md b/vendor/github.com/cespare/xxhash/v2/README.md
index 792b4a60b..8bf0e5b78 100644
--- a/vendor/github.com/cespare/xxhash/v2/README.md
+++ b/vendor/github.com/cespare/xxhash/v2/README.md
@@ -3,8 +3,7 @@
 [![Go Reference](https://pkg.go.dev/badge/github.com/cespare/xxhash/v2.svg)](https://pkg.go.dev/github.com/cespare/xxhash/v2)
 [![Test](https://github.com/cespare/xxhash/actions/workflows/test.yml/badge.svg)](https://github.com/cespare/xxhash/actions/workflows/test.yml)
 
-xxhash is a Go implementation of the 64-bit
-[xxHash](http://cyan4973.github.io/xxHash/) algorithm, XXH64. This is a
+xxhash is a Go implementation of the 64-bit [xxHash] algorithm, XXH64. This is a
 high-quality hashing algorithm that is much faster than anything in the Go
 standard library.
 
@@ -25,8 +24,11 @@ func (*Digest) WriteString(string) (int, error)
 func (*Digest) Sum64() uint64
 ```
 
-This implementation provides a fast pure-Go implementation and an even faster
-assembly implementation for amd64.
+The package is written with optimized pure Go and also contains even faster
+assembly implementations for amd64 and arm64. If desired, the `purego` build tag
+opts into using the Go code even on those architectures.
+
+[xxHash]: http://cyan4973.github.io/xxHash/
 
 ## Compatibility
 
@@ -45,19 +47,20 @@ I recommend using the latest release of Go.
 Here are some quick benchmarks comparing the pure-Go and assembly
 implementations of Sum64.
 
-| input size | purego | asm |
-| --- | --- | --- |
-| 5 B   |  979.66 MB/s |  1291.17 MB/s  |
-| 100 B | 7475.26 MB/s | 7973.40 MB/s  |
-| 4 KB  | 17573.46 MB/s | 17602.65 MB/s |
-| 10 MB | 17131.46 MB/s | 17142.16 MB/s |
+| input size | purego    | asm       |
+| ---------- | --------- | --------- |
+| 4 B        |  1.3 GB/s |  1.2 GB/s |
+| 16 B       |  2.9 GB/s |  3.5 GB/s |
+| 100 B      |  6.9 GB/s |  8.1 GB/s |
+| 4 KB       | 11.7 GB/s | 16.7 GB/s |
+| 10 MB      | 12.0 GB/s | 17.3 GB/s |
 
-These numbers were generated on Ubuntu 18.04 with an Intel i7-8700K CPU using
-the following commands under Go 1.11.2:
+These numbers were generated on Ubuntu 20.04 with an Intel Xeon Platinum 8252C
+CPU using the following commands under Go 1.19.2:
 
 ```
-$ go test -tags purego -benchtime 10s -bench '/xxhash,direct,bytes'
-$ go test -benchtime 10s -bench '/xxhash,direct,bytes'
+benchstat <(go test -tags purego -benchtime 500ms -count 15 -bench 'Sum64$')
+benchstat <(go test -benchtime 500ms -count 15 -bench 'Sum64$')
 ```
 
 ## Projects using this package
diff --git a/vendor/github.com/cespare/xxhash/v2/testall.sh b/vendor/github.com/cespare/xxhash/v2/testall.sh
new file mode 100644
index 000000000..94b9c4439
--- /dev/null
+++ b/vendor/github.com/cespare/xxhash/v2/testall.sh
@@ -0,0 +1,10 @@
+#!/bin/bash
+set -eu -o pipefail
+
+# Small convenience script for running the tests with various combinations of
+# arch/tags. This assumes we're running on amd64 and have qemu available.
+
+go test ./...
+go test -tags purego ./...
+GOARCH=arm64 go test
+GOARCH=arm64 go test -tags purego
diff --git a/vendor/github.com/cespare/xxhash/v2/xxhash.go b/vendor/github.com/cespare/xxhash/v2/xxhash.go
index 15c835d54..a9e0d45c9 100644
--- a/vendor/github.com/cespare/xxhash/v2/xxhash.go
+++ b/vendor/github.com/cespare/xxhash/v2/xxhash.go
@@ -16,19 +16,11 @@ const (
 	prime5 uint64 = 2870177450012600261
 )
 
-// NOTE(caleb): I'm using both consts and vars of the primes. Using consts where
-// possible in the Go code is worth a small (but measurable) performance boost
-// by avoiding some MOVQs. Vars are needed for the asm and also are useful for
-// convenience in the Go code in a few places where we need to intentionally
-// avoid constant arithmetic (e.g., v1 := prime1 + prime2 fails because the
-// result overflows a uint64).
-var (
-	prime1v = prime1
-	prime2v = prime2
-	prime3v = prime3
-	prime4v = prime4
-	prime5v = prime5
-)
+// Store the primes in an array as well.
+//
+// The consts are used when possible in Go code to avoid MOVs but we need a
+// contiguous array of the assembly code.
+var primes = [...]uint64{prime1, prime2, prime3, prime4, prime5}
 
 // Digest implements hash.Hash64.
 type Digest struct {
@@ -50,10 +42,10 @@ func New() *Digest {
 
 // Reset clears the Digest's state so that it can be reused.
 func (d *Digest) Reset() {
-	d.v1 = prime1v + prime2
+	d.v1 = primes[0] + prime2
 	d.v2 = prime2
 	d.v3 = 0
-	d.v4 = -prime1v
+	d.v4 = -primes[0]
 	d.total = 0
 	d.n = 0
 }
@@ -69,21 +61,23 @@ func (d *Digest) Write(b []byte) (n int, err error) {
 	n = len(b)
 	d.total += uint64(n)
 
+	memleft := d.mem[d.n&(len(d.mem)-1):]
+
 	if d.n+n < 32 {
 		// This new data doesn't even fill the current block.
-		copy(d.mem[d.n:], b)
+		copy(memleft, b)
 		d.n += n
 		return
 	}
 
 	if d.n > 0 {
 		// Finish off the partial block.
-		copy(d.mem[d.n:], b)
+		c := copy(memleft, b)
 		d.v1 = round(d.v1, u64(d.mem[0:8]))
 		d.v2 = round(d.v2, u64(d.mem[8:16]))
 		d.v3 = round(d.v3, u64(d.mem[16:24]))
 		d.v4 = round(d.v4, u64(d.mem[24:32]))
-		b = b[32-d.n:]
+		b = b[c:]
 		d.n = 0
 	}
 
@@ -133,21 +127,20 @@ func (d *Digest) Sum64() uint64 {
 
 	h += d.total
 
-	i, end := 0, d.n
-	for ; i+8 <= end; i += 8 {
-		k1 := round(0, u64(d.mem[i:i+8]))
+	b := d.mem[:d.n&(len(d.mem)-1)]
+	for ; len(b) >= 8; b = b[8:] {
+		k1 := round(0, u64(b[:8]))
 		h ^= k1
 		h = rol27(h)*prime1 + prime4
 	}
-	if i+4 <= end {
-		h ^= uint64(u32(d.mem[i:i+4])) * prime1
+	if len(b) >= 4 {
+		h ^= uint64(u32(b[:4])) * prime1
 		h = rol23(h)*prime2 + prime3
-		i += 4
+		b = b[4:]
 	}
-	for i < end {
-		h ^= uint64(d.mem[i]) * prime5
+	for ; len(b) > 0; b = b[1:] {
+		h ^= uint64(b[0]) * prime5
 		h = rol11(h) * prime1
-		i++
 	}
 
 	h ^= h >> 33
diff --git a/vendor/github.com/cespare/xxhash/v2/xxhash_amd64.s b/vendor/github.com/cespare/xxhash/v2/xxhash_amd64.s
index be8db5bf7..3e8b13257 100644
--- a/vendor/github.com/cespare/xxhash/v2/xxhash_amd64.s
+++ b/vendor/github.com/cespare/xxhash/v2/xxhash_amd64.s
@@ -1,215 +1,209 @@
+//go:build !appengine && gc && !purego
 // +build !appengine
 // +build gc
 // +build !purego
 
 #include "textflag.h"
 
-// Register allocation:
-// AX	h
-// SI	pointer to advance through b
-// DX	n
-// BX	loop end
-// R8	v1, k1
-// R9	v2
-// R10	v3
-// R11	v4
-// R12	tmp
-// R13	prime1v
-// R14	prime2v
-// DI	prime4v
-
-// round reads from and advances the buffer pointer in SI.
-// It assumes that R13 has prime1v and R14 has prime2v.
-#define round(r) \
-	MOVQ  (SI), R12 \
-	ADDQ  $8, SI    \
-	IMULQ R14, R12  \
-	ADDQ  R12, r    \
-	ROLQ  $31, r    \
-	IMULQ R13, r
-
-// mergeRound applies a merge round on the two registers acc and val.
-// It assumes that R13 has prime1v, R14 has prime2v, and DI has prime4v.
-#define mergeRound(acc, val) \
-	IMULQ R14, val \
-	ROLQ  $31, val \
-	IMULQ R13, val \
-	XORQ  val, acc \
-	IMULQ R13, acc \
-	ADDQ  DI, acc
+// Registers:
+#define h      AX
+#define d      AX
+#define p      SI // pointer to advance through b
+#define n      DX
+#define end    BX // loop end
+#define v1     R8
+#define v2     R9
+#define v3     R10
+#define v4     R11
+#define x      R12
+#define prime1 R13
+#define prime2 R14
+#define prime4 DI
+
+#define round(acc, x) \
+	IMULQ prime2, x   \
+	ADDQ  x, acc      \
+	ROLQ  $31, acc    \
+	IMULQ prime1, acc
+
+// round0 performs the operation x = round(0, x).
+#define round0(x) \
+	IMULQ prime2, x \
+	ROLQ  $31, x    \
+	IMULQ prime1, x
+
+// mergeRound applies a merge round on the two registers acc and x.
+// It assumes that prime1, prime2, and prime4 have been loaded.
+#define mergeRound(acc, x) \
+	round0(x)         \
+	XORQ  x, acc      \
+	IMULQ prime1, acc \
+	ADDQ  prime4, acc
+
+// blockLoop processes as many 32-byte blocks as possible,
+// updating v1, v2, v3, and v4. It assumes that there is at least one block
+// to process.
+#define blockLoop() \
+loop:  \
+	MOVQ +0(p), x  \
+	round(v1, x)   \
+	MOVQ +8(p), x  \
+	round(v2, x)   \
+	MOVQ +16(p), x \
+	round(v3, x)   \
+	MOVQ +24(p), x \
+	round(v4, x)   \
+	ADDQ $32, p    \
+	CMPQ p, end    \
+	JLE  loop
 
 // func Sum64(b []byte) uint64
-TEXT ·Sum64(SB), NOSPLIT, $0-32
+TEXT ·Sum64(SB), NOSPLIT|NOFRAME, $0-32
 	// Load fixed primes.
-	MOVQ ·prime1v(SB), R13
-	MOVQ ·prime2v(SB), R14
-	MOVQ ·prime4v(SB), DI
+	MOVQ ·primes+0(SB), prime1
+	MOVQ ·primes+8(SB), prime2
+	MOVQ ·primes+24(SB), prime4
 
 	// Load slice.
-	MOVQ b_base+0(FP), SI
-	MOVQ b_len+8(FP), DX
-	LEAQ (SI)(DX*1), BX
+	MOVQ b_base+0(FP), p
+	MOVQ b_len+8(FP), n
+	LEAQ (p)(n*1), end
 
 	// The first loop limit will be len(b)-32.
-	SUBQ $32, BX
+	SUBQ $32, end
 
 	// Check whether we have at least one block.
-	CMPQ DX, $32
+	CMPQ n, $32
 	JLT  noBlocks
 
 	// Set up initial state (v1, v2, v3, v4).
-	MOVQ R13, R8
-	ADDQ R14, R8
-	MOVQ R14, R9
-	XORQ R10, R10
-	XORQ R11, R11
-	SUBQ R13, R11
-
-	// Loop until SI > BX.
-blockLoop:
-	round(R8)
-	round(R9)
-	round(R10)
-	round(R11)
-
-	CMPQ SI, BX
-	JLE  blockLoop
-
-	MOVQ R8, AX
-	ROLQ $1, AX
-	MOVQ R9, R12
-	ROLQ $7, R12
-	ADDQ R12, AX
-	MOVQ R10, R12
-	ROLQ $12, R12
-	ADDQ R12, AX
-	MOVQ R11, R12
-	ROLQ $18, R12
-	ADDQ R12, AX
-
-	mergeRound(AX, R8)
-	mergeRound(AX, R9)
-	mergeRound(AX, R10)
-	mergeRound(AX, R11)
+	MOVQ prime1, v1
+	ADDQ prime2, v1
+	MOVQ prime2, v2
+	XORQ v3, v3
+	XORQ v4, v4
+	SUBQ prime1, v4
+
+	blockLoop()
+
+	MOVQ v1, h
+	ROLQ $1, h
+	MOVQ v2, x
+	ROLQ $7, x
+	ADDQ x, h
+	MOVQ v3, x
+	ROLQ $12, x
+	ADDQ x, h
+	MOVQ v4, x
+	ROLQ $18, x
+	ADDQ x, h
+
+	mergeRound(h, v1)
+	mergeRound(h, v2)
+	mergeRound(h, v3)
+	mergeRound(h, v4)
 
 	JMP afterBlocks
 
 noBlocks:
-	MOVQ ·prime5v(SB), AX
+	MOVQ ·primes+32(SB), h
 
 afterBlocks:
-	ADDQ DX, AX
-
-	// Right now BX has len(b)-32, and we want to loop until SI > len(b)-8.
-	ADDQ $24, BX
-
-	CMPQ SI, BX
-	JG   fourByte
-
-wordLoop:
-	// Calculate k1.
-	MOVQ  (SI), R8
-	ADDQ  $8, SI
-	IMULQ R14, R8
-	ROLQ  $31, R8
-	IMULQ R13, R8
-
-	XORQ  R8, AX
-	ROLQ  $27, AX
-	IMULQ R13, AX
-	ADDQ  DI, AX
-
-	CMPQ SI, BX
-	JLE  wordLoop
-
-fourByte:
-	ADDQ $4, BX
-	CMPQ SI, BX
-	JG   singles
-
-	MOVL  (SI), R8
-	ADDQ  $4, SI
-	IMULQ R13, R8
-	XORQ  R8, AX
-
-	ROLQ  $23, AX
-	IMULQ R14, AX
-	ADDQ  ·prime3v(SB), AX
-
-singles:
-	ADDQ $4, BX
-	CMPQ SI, BX
+	ADDQ n, h
+
+	ADDQ $24, end
+	CMPQ p, end
+	JG   try4
+
+loop8:
+	MOVQ  (p), x
+	ADDQ  $8, p
+	round0(x)
+	XORQ  x, h
+	ROLQ  $27, h
+	IMULQ prime1, h
+	ADDQ  prime4, h
+
+	CMPQ p, end
+	JLE  loop8
+
+try4:
+	ADDQ $4, end
+	CMPQ p, end
+	JG   try1
+
+	MOVL  (p), x
+	ADDQ  $4, p
+	IMULQ prime1, x
+	XORQ  x, h
+
+	ROLQ  $23, h
+	IMULQ prime2, h
+	ADDQ  ·primes+16(SB), h
+
+try1:
+	ADDQ $4, end
+	CMPQ p, end
 	JGE  finalize
 
-singlesLoop:
-	MOVBQZX (SI), R12
-	ADDQ    $1, SI
-	IMULQ   ·prime5v(SB), R12
-	XORQ    R12, AX
+loop1:
+	MOVBQZX (p), x
+	ADDQ    $1, p
+	IMULQ   ·primes+32(SB), x
+	XORQ    x, h
+	ROLQ    $11, h
+	IMULQ   prime1, h
 
-	ROLQ  $11, AX
-	IMULQ R13, AX
-
-	CMPQ SI, BX
-	JL   singlesLoop
+	CMPQ p, end
+	JL   loop1
 
 finalize:
-	MOVQ  AX, R12
-	SHRQ  $33, R12
-	XORQ  R12, AX
-	IMULQ R14, AX
-	MOVQ  AX, R12
-	SHRQ  $29, R12
-	XORQ  R12, AX
-	IMULQ ·prime3v(SB), AX
-	MOVQ  AX, R12
-	SHRQ  $32, R12
-	XORQ  R12, AX
-
-	MOVQ AX, ret+24(FP)
+	MOVQ  h, x
+	SHRQ  $33, x
+	XORQ  x, h
+	IMULQ prime2, h
+	MOVQ  h, x
+	SHRQ  $29, x
+	XORQ  x, h
+	IMULQ ·primes+16(SB), h
+	MOVQ  h, x
+	SHRQ  $32, x
+	XORQ  x, h
+
+	MOVQ h, ret+24(FP)
 	RET
 
-// writeBlocks uses the same registers as above except that it uses AX to store
-// the d pointer.
-
 // func writeBlocks(d *Digest, b []byte) int
-TEXT ·writeBlocks(SB), NOSPLIT, $0-40
+TEXT ·writeBlocks(SB), NOSPLIT|NOFRAME, $0-40
 	// Load fixed primes needed for round.
-	MOVQ ·prime1v(SB), R13
-	MOVQ ·prime2v(SB), R14
+	MOVQ ·primes+0(SB), prime1
+	MOVQ ·primes+8(SB), prime2
 
 	// Load slice.
-	MOVQ b_base+8(FP), SI
-	MOVQ b_len+16(FP), DX
-	LEAQ (SI)(DX*1), BX
-	SUBQ $32, BX
+	MOVQ b_base+8(FP), p
+	MOVQ b_len+16(FP), n
+	LEAQ (p)(n*1), end
+	SUBQ $32, end
 
 	// Load vN from d.
-	MOVQ d+0(FP), AX
-	MOVQ 0(AX), R8   // v1
-	MOVQ 8(AX), R9   // v2
-	MOVQ 16(AX), R10 // v3
-	MOVQ 24(AX), R11 // v4
+	MOVQ s+0(FP), d
+	MOVQ 0(d), v1
+	MOVQ 8(d), v2
+	MOVQ 16(d), v3
+	MOVQ 24(d), v4
 
 	// We don't need to check the loop condition here; this function is
 	// always called with at least one block of data to process.
-blockLoop:
-	round(R8)
-	round(R9)
-	round(R10)
-	round(R11)
-
-	CMPQ SI, BX
-	JLE  blockLoop
+	blockLoop()
 
 	// Copy vN back to d.
-	MOVQ R8, 0(AX)
-	MOVQ R9, 8(AX)
-	MOVQ R10, 16(AX)
-	MOVQ R11, 24(AX)
-
-	// The number of bytes written is SI minus the old base pointer.
-	SUBQ b_base+8(FP), SI
-	MOVQ SI, ret+32(FP)
+	MOVQ v1, 0(d)
+	MOVQ v2, 8(d)
+	MOVQ v3, 16(d)
+	MOVQ v4, 24(d)
+
+	// The number of bytes written is p minus the old base pointer.
+	SUBQ b_base+8(FP), p
+	MOVQ p, ret+32(FP)
 
 	RET
diff --git a/vendor/github.com/cespare/xxhash/v2/xxhash_arm64.s b/vendor/github.com/cespare/xxhash/v2/xxhash_arm64.s
new file mode 100644
index 000000000..7e3145a22
--- /dev/null
+++ b/vendor/github.com/cespare/xxhash/v2/xxhash_arm64.s
@@ -0,0 +1,183 @@
+//go:build !appengine && gc && !purego
+// +build !appengine
+// +build gc
+// +build !purego
+
+#include "textflag.h"
+
+// Registers:
+#define digest	R1
+#define h	R2 // return value
+#define p	R3 // input pointer
+#define n	R4 // input length
+#define nblocks	R5 // n / 32
+#define prime1	R7
+#define prime2	R8
+#define prime3	R9
+#define prime4	R10
+#define prime5	R11
+#define v1	R12
+#define v2	R13
+#define v3	R14
+#define v4	R15
+#define x1	R20
+#define x2	R21
+#define x3	R22
+#define x4	R23
+
+#define round(acc, x) \
+	MADD prime2, acc, x, acc \
+	ROR  $64-31, acc         \
+	MUL  prime1, acc
+
+// round0 performs the operation x = round(0, x).
+#define round0(x) \
+	MUL prime2, x \
+	ROR $64-31, x \
+	MUL prime1, x
+
+#define mergeRound(acc, x) \
+	round0(x)                     \
+	EOR  x, acc                   \
+	MADD acc, prime4, prime1, acc
+
+// blockLoop processes as many 32-byte blocks as possible,
+// updating v1, v2, v3, and v4. It assumes that n >= 32.
+#define blockLoop() \
+	LSR     $5, n, nblocks  \
+	PCALIGN $16             \
+	loop:                   \
+	LDP.P   16(p), (x1, x2) \
+	LDP.P   16(p), (x3, x4) \
+	round(v1, x1)           \
+	round(v2, x2)           \
+	round(v3, x3)           \
+	round(v4, x4)           \
+	SUB     $1, nblocks     \
+	CBNZ    nblocks, loop
+
+// func Sum64(b []byte) uint64
+TEXT ·Sum64(SB), NOSPLIT|NOFRAME, $0-32
+	LDP b_base+0(FP), (p, n)
+
+	LDP  ·primes+0(SB), (prime1, prime2)
+	LDP  ·primes+16(SB), (prime3, prime4)
+	MOVD ·primes+32(SB), prime5
+
+	CMP  $32, n
+	CSEL LT, prime5, ZR, h // if n < 32 { h = prime5 } else { h = 0 }
+	BLT  afterLoop
+
+	ADD  prime1, prime2, v1
+	MOVD prime2, v2
+	MOVD $0, v3
+	NEG  prime1, v4
+
+	blockLoop()
+
+	ROR $64-1, v1, x1
+	ROR $64-7, v2, x2
+	ADD x1, x2
+	ROR $64-12, v3, x3
+	ROR $64-18, v4, x4
+	ADD x3, x4
+	ADD x2, x4, h
+
+	mergeRound(h, v1)
+	mergeRound(h, v2)
+	mergeRound(h, v3)
+	mergeRound(h, v4)
+
+afterLoop:
+	ADD n, h
+
+	TBZ   $4, n, try8
+	LDP.P 16(p), (x1, x2)
+
+	round0(x1)
+
+	// NOTE: here and below, sequencing the EOR after the ROR (using a
+	// rotated register) is worth a small but measurable speedup for small
+	// inputs.
+	ROR  $64-27, h
+	EOR  x1 @> 64-27, h, h
+	MADD h, prime4, prime1, h
+
+	round0(x2)
+	ROR  $64-27, h
+	EOR  x2 @> 64-27, h, h
+	MADD h, prime4, prime1, h
+
+try8:
+	TBZ    $3, n, try4
+	MOVD.P 8(p), x1
+
+	round0(x1)
+	ROR  $64-27, h
+	EOR  x1 @> 64-27, h, h
+	MADD h, prime4, prime1, h
+
+try4:
+	TBZ     $2, n, try2
+	MOVWU.P 4(p), x2
+
+	MUL  prime1, x2
+	ROR  $64-23, h
+	EOR  x2 @> 64-23, h, h
+	MADD h, prime3, prime2, h
+
+try2:
+	TBZ     $1, n, try1
+	MOVHU.P 2(p), x3
+	AND     $255, x3, x1
+	LSR     $8, x3, x2
+
+	MUL prime5, x1
+	ROR $64-11, h
+	EOR x1 @> 64-11, h, h
+	MUL prime1, h
+
+	MUL prime5, x2
+	ROR $64-11, h
+	EOR x2 @> 64-11, h, h
+	MUL prime1, h
+
+try1:
+	TBZ   $0, n, finalize
+	MOVBU (p), x4
+
+	MUL prime5, x4
+	ROR $64-11, h
+	EOR x4 @> 64-11, h, h
+	MUL prime1, h
+
+finalize:
+	EOR h >> 33, h
+	MUL prime2, h
+	EOR h >> 29, h
+	MUL prime3, h
+	EOR h >> 32, h
+
+	MOVD h, ret+24(FP)
+	RET
+
+// func writeBlocks(d *Digest, b []byte) int
+TEXT ·writeBlocks(SB), NOSPLIT|NOFRAME, $0-40
+	LDP ·primes+0(SB), (prime1, prime2)
+
+	// Load state. Assume v[1-4] are stored contiguously.
+	MOVD d+0(FP), digest
+	LDP  0(digest), (v1, v2)
+	LDP  16(digest), (v3, v4)
+
+	LDP b_base+8(FP), (p, n)
+
+	blockLoop()
+
+	// Store updated state.
+	STP (v1, v2), 0(digest)
+	STP (v3, v4), 16(digest)
+
+	BIC  $31, n
+	MOVD n, ret+32(FP)
+	RET
diff --git a/vendor/github.com/cespare/xxhash/v2/xxhash_amd64.go b/vendor/github.com/cespare/xxhash/v2/xxhash_asm.go
similarity index 73%
rename from vendor/github.com/cespare/xxhash/v2/xxhash_amd64.go
rename to vendor/github.com/cespare/xxhash/v2/xxhash_asm.go
index ad14b807f..9216e0a40 100644
--- a/vendor/github.com/cespare/xxhash/v2/xxhash_amd64.go
+++ b/vendor/github.com/cespare/xxhash/v2/xxhash_asm.go
@@ -1,3 +1,5 @@
+//go:build (amd64 || arm64) && !appengine && gc && !purego
+// +build amd64 arm64
 // +build !appengine
 // +build gc
 // +build !purego
diff --git a/vendor/github.com/cespare/xxhash/v2/xxhash_other.go b/vendor/github.com/cespare/xxhash/v2/xxhash_other.go
index 4a5a82160..26df13bba 100644
--- a/vendor/github.com/cespare/xxhash/v2/xxhash_other.go
+++ b/vendor/github.com/cespare/xxhash/v2/xxhash_other.go
@@ -1,4 +1,5 @@
-// +build !amd64 appengine !gc purego
+//go:build (!amd64 && !arm64) || appengine || !gc || purego
+// +build !amd64,!arm64 appengine !gc purego
 
 package xxhash
 
@@ -14,10 +15,10 @@ func Sum64(b []byte) uint64 {
 	var h uint64
 
 	if n >= 32 {
-		v1 := prime1v + prime2
+		v1 := primes[0] + prime2
 		v2 := prime2
 		v3 := uint64(0)
-		v4 := -prime1v
+		v4 := -primes[0]
 		for len(b) >= 32 {
 			v1 = round(v1, u64(b[0:8:len(b)]))
 			v2 = round(v2, u64(b[8:16:len(b)]))
@@ -36,19 +37,18 @@ func Sum64(b []byte) uint64 {
 
 	h += uint64(n)
 
-	i, end := 0, len(b)
-	for ; i+8 <= end; i += 8 {
-		k1 := round(0, u64(b[i:i+8:len(b)]))
+	for ; len(b) >= 8; b = b[8:] {
+		k1 := round(0, u64(b[:8]))
 		h ^= k1
 		h = rol27(h)*prime1 + prime4
 	}
-	if i+4 <= end {
-		h ^= uint64(u32(b[i:i+4:len(b)])) * prime1
+	if len(b) >= 4 {
+		h ^= uint64(u32(b[:4])) * prime1
 		h = rol23(h)*prime2 + prime3
-		i += 4
+		b = b[4:]
 	}
-	for ; i < end; i++ {
-		h ^= uint64(b[i]) * prime5
+	for ; len(b) > 0; b = b[1:] {
+		h ^= uint64(b[0]) * prime5
 		h = rol11(h) * prime1
 	}
 
diff --git a/vendor/github.com/cespare/xxhash/v2/xxhash_safe.go b/vendor/github.com/cespare/xxhash/v2/xxhash_safe.go
index fc9bea7a3..e86f1b5fd 100644
--- a/vendor/github.com/cespare/xxhash/v2/xxhash_safe.go
+++ b/vendor/github.com/cespare/xxhash/v2/xxhash_safe.go
@@ -1,3 +1,4 @@
+//go:build appengine
 // +build appengine
 
 // This file contains the safe implementations of otherwise unsafe-using code.
diff --git a/vendor/github.com/cespare/xxhash/v2/xxhash_unsafe.go b/vendor/github.com/cespare/xxhash/v2/xxhash_unsafe.go
index 376e0ca2e..1c1638fd8 100644
--- a/vendor/github.com/cespare/xxhash/v2/xxhash_unsafe.go
+++ b/vendor/github.com/cespare/xxhash/v2/xxhash_unsafe.go
@@ -1,3 +1,4 @@
+//go:build !appengine
 // +build !appengine
 
 // This file encapsulates usage of unsafe.
@@ -11,7 +12,7 @@ import (
 
 // In the future it's possible that compiler optimizations will make these
 // XxxString functions unnecessary by realizing that calls such as
-// Sum64([]byte(s)) don't need to copy s. See https://golang.org/issue/2205.
+// Sum64([]byte(s)) don't need to copy s. See https://go.dev/issue/2205.
 // If that happens, even if we keep these functions they can be replaced with
 // the trivial safe code.
 
diff --git a/vendor/golang.org/x/net/context/ctxhttp/BUILD.bazel b/vendor/golang.org/x/net/context/ctxhttp/BUILD.bazel
deleted file mode 100644
index 0ac02dea2..000000000
--- a/vendor/golang.org/x/net/context/ctxhttp/BUILD.bazel
+++ /dev/null
@@ -1,9 +0,0 @@
-load("@io_bazel_rules_go//go:def.bzl", "go_library")
-
-go_library(
-    name = "go_default_library",
-    srcs = ["ctxhttp.go"],
-    importmap = "kubevirt.io/kubevirt/vendor/golang.org/x/net/context/ctxhttp",
-    importpath = "golang.org/x/net/context/ctxhttp",
-    visibility = ["//visibility:public"],
-)
diff --git a/vendor/golang.org/x/net/context/ctxhttp/ctxhttp.go b/vendor/golang.org/x/net/context/ctxhttp/ctxhttp.go
deleted file mode 100644
index 37dc0cfdb..000000000
--- a/vendor/golang.org/x/net/context/ctxhttp/ctxhttp.go
+++ /dev/null
@@ -1,71 +0,0 @@
-// Copyright 2016 The Go Authors. All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
-
-// Package ctxhttp provides helper functions for performing context-aware HTTP requests.
-package ctxhttp // import "golang.org/x/net/context/ctxhttp"
-
-import (
-	"context"
-	"io"
-	"net/http"
-	"net/url"
-	"strings"
-)
-
-// Do sends an HTTP request with the provided http.Client and returns
-// an HTTP response.
-//
-// If the client is nil, http.DefaultClient is used.
-//
-// The provided ctx must be non-nil. If it is canceled or times out,
-// ctx.Err() will be returned.
-func Do(ctx context.Context, client *http.Client, req *http.Request) (*http.Response, error) {
-	if client == nil {
-		client = http.DefaultClient
-	}
-	resp, err := client.Do(req.WithContext(ctx))
-	// If we got an error, and the context has been canceled,
-	// the context's error is probably more useful.
-	if err != nil {
-		select {
-		case <-ctx.Done():
-			err = ctx.Err()
-		default:
-		}
-	}
-	return resp, err
-}
-
-// Get issues a GET request via the Do function.
-func Get(ctx context.Context, client *http.Client, url string) (*http.Response, error) {
-	req, err := http.NewRequest("GET", url, nil)
-	if err != nil {
-		return nil, err
-	}
-	return Do(ctx, client, req)
-}
-
-// Head issues a HEAD request via the Do function.
-func Head(ctx context.Context, client *http.Client, url string) (*http.Response, error) {
-	req, err := http.NewRequest("HEAD", url, nil)
-	if err != nil {
-		return nil, err
-	}
-	return Do(ctx, client, req)
-}
-
-// Post issues a POST request via the Do function.
-func Post(ctx context.Context, client *http.Client, url string, bodyType string, body io.Reader) (*http.Response, error) {
-	req, err := http.NewRequest("POST", url, body)
-	if err != nil {
-		return nil, err
-	}
-	req.Header.Set("Content-Type", bodyType)
-	return Do(ctx, client, req)
-}
-
-// PostForm issues a POST request via the Do function.
-func PostForm(ctx context.Context, client *http.Client, url string, data url.Values) (*http.Response, error) {
-	return Post(ctx, client, url, "application/x-www-form-urlencoded", strings.NewReader(data.Encode()))
-}
diff --git a/vendor/golang.org/x/oauth2/AUTHORS b/vendor/golang.org/x/oauth2/AUTHORS
deleted file mode 100644
index 15167cd74..000000000
--- a/vendor/golang.org/x/oauth2/AUTHORS
+++ /dev/null
@@ -1,3 +0,0 @@
-# This source code refers to The Go Authors for copyright purposes.
-# The master list of authors is in the main Go distribution,
-# visible at http://tip.golang.org/AUTHORS.
diff --git a/vendor/golang.org/x/oauth2/CONTRIBUTORS b/vendor/golang.org/x/oauth2/CONTRIBUTORS
deleted file mode 100644
index 1c4577e96..000000000
--- a/vendor/golang.org/x/oauth2/CONTRIBUTORS
+++ /dev/null
@@ -1,3 +0,0 @@
-# This source code was written by the Go contributors.
-# The master list of contributors is in the main Go distribution,
-# visible at http://tip.golang.org/CONTRIBUTORS.
diff --git a/vendor/golang.org/x/oauth2/README.md b/vendor/golang.org/x/oauth2/README.md
index 1473e1296..781770c20 100644
--- a/vendor/golang.org/x/oauth2/README.md
+++ b/vendor/golang.org/x/oauth2/README.md
@@ -19,7 +19,7 @@ See pkg.go.dev for further documentation and examples.
 * [pkg.go.dev/golang.org/x/oauth2](https://pkg.go.dev/golang.org/x/oauth2)
 * [pkg.go.dev/golang.org/x/oauth2/google](https://pkg.go.dev/golang.org/x/oauth2/google)
 
-## Policy for new packages
+## Policy for new endpoints
 
 We no longer accept new provider-specific packages in this repo if all
 they do is add a single endpoint variable. If you just want to add a
@@ -29,8 +29,12 @@ package.
 
 ## Report Issues / Send Patches
 
-This repository uses Gerrit for code changes. To learn how to submit changes to
-this repository, see https://golang.org/doc/contribute.html.
-
 The main issue tracker for the oauth2 repository is located at
 https://github.com/golang/oauth2/issues.
+
+This repository uses Gerrit for code changes. To learn how to submit changes to
+this repository, see https://golang.org/doc/contribute.html. In particular:
+
+* Excluding trivial changes, all contributions should be connected to an existing issue.
+* API changes must go through the [change proposal process](https://go.dev/s/proposal-process) before they can be accepted.
+* The code owners are listed at [dev.golang.org/owners](https://dev.golang.org/owners#:~:text=x/oauth2).
diff --git a/vendor/golang.org/x/oauth2/internal/BUILD.bazel b/vendor/golang.org/x/oauth2/internal/BUILD.bazel
index 6c625078f..1de6d207c 100644
--- a/vendor/golang.org/x/oauth2/internal/BUILD.bazel
+++ b/vendor/golang.org/x/oauth2/internal/BUILD.bazel
@@ -11,5 +11,4 @@ go_library(
     importmap = "kubevirt.io/kubevirt/vendor/golang.org/x/oauth2/internal",
     importpath = "golang.org/x/oauth2/internal",
     visibility = ["//vendor/golang.org/x/oauth2:__subpackages__"],
-    deps = ["//vendor/golang.org/x/net/context/ctxhttp:go_default_library"],
 )
diff --git a/vendor/golang.org/x/oauth2/internal/token.go b/vendor/golang.org/x/oauth2/internal/token.go
index 355c38696..b4723fcac 100644
--- a/vendor/golang.org/x/oauth2/internal/token.go
+++ b/vendor/golang.org/x/oauth2/internal/token.go
@@ -19,8 +19,6 @@ import (
 	"strings"
 	"sync"
 	"time"
-
-	"golang.org/x/net/context/ctxhttp"
 )
 
 // Token represents the credentials used to authorize
@@ -229,7 +227,7 @@ func RetrieveToken(ctx context.Context, clientID, clientSecret, tokenURL string,
 }
 
 func doTokenRoundTrip(ctx context.Context, req *http.Request) (*Token, error) {
-	r, err := ctxhttp.Do(ctx, ContextClient(ctx), req)
+	r, err := ContextClient(ctx).Do(req.WithContext(ctx))
 	if err != nil {
 		return nil, err
 	}
diff --git a/vendor/golang.org/x/oauth2/oauth2.go b/vendor/golang.org/x/oauth2/oauth2.go
index 291df5c83..9085fabe3 100644
--- a/vendor/golang.org/x/oauth2/oauth2.go
+++ b/vendor/golang.org/x/oauth2/oauth2.go
@@ -16,6 +16,7 @@ import (
 	"net/url"
 	"strings"
 	"sync"
+	"time"
 
 	"golang.org/x/oauth2/internal"
 )
@@ -140,7 +141,7 @@ func SetAuthURLParam(key, value string) AuthCodeOption {
 //
 // State is a token to protect the user from CSRF attacks. You must
 // always provide a non-empty string and validate that it matches the
-// the state query parameter on your redirect callback.
+// state query parameter on your redirect callback.
 // See http://tools.ietf.org/html/rfc6749#section-10.12 for more info.
 //
 // Opts may include AccessTypeOnline or AccessTypeOffline, as well
@@ -290,6 +291,8 @@ type reuseTokenSource struct {
 
 	mu sync.Mutex // guards t
 	t  *Token
+
+	expiryDelta time.Duration
 }
 
 // Token returns the current token if it's still valid, else will
@@ -305,6 +308,7 @@ func (s *reuseTokenSource) Token() (*Token, error) {
 	if err != nil {
 		return nil, err
 	}
+	t.expiryDelta = s.expiryDelta
 	s.t = t
 	return t, nil
 }
@@ -379,3 +383,30 @@ func ReuseTokenSource(t *Token, src TokenSource) TokenSource {
 		new: src,
 	}
 }
+
+// ReuseTokenSource returns a TokenSource that acts in the same manner as the
+// TokenSource returned by ReuseTokenSource, except the expiry buffer is
+// configurable. The expiration time of a token is calculated as
+// t.Expiry.Add(-earlyExpiry).
+func ReuseTokenSourceWithExpiry(t *Token, src TokenSource, earlyExpiry time.Duration) TokenSource {
+	// Don't wrap a reuseTokenSource in itself. That would work,
+	// but cause an unnecessary number of mutex operations.
+	// Just build the equivalent one.
+	if rt, ok := src.(*reuseTokenSource); ok {
+		if t == nil {
+			// Just use it directly, but set the expiryDelta to earlyExpiry,
+			// so the behavior matches what the user expects.
+			rt.expiryDelta = earlyExpiry
+			return rt
+		}
+		src = rt.new
+	}
+	if t != nil {
+		t.expiryDelta = earlyExpiry
+	}
+	return &reuseTokenSource{
+		t:           t,
+		new:         src,
+		expiryDelta: earlyExpiry,
+	}
+}
diff --git a/vendor/golang.org/x/oauth2/token.go b/vendor/golang.org/x/oauth2/token.go
index 822720341..7c64006de 100644
--- a/vendor/golang.org/x/oauth2/token.go
+++ b/vendor/golang.org/x/oauth2/token.go
@@ -16,10 +16,10 @@ import (
 	"golang.org/x/oauth2/internal"
 )
 
-// expiryDelta determines how earlier a token should be considered
+// defaultExpiryDelta determines how earlier a token should be considered
 // expired than its actual expiration time. It is used to avoid late
 // expirations due to client-server time mismatches.
-const expiryDelta = 10 * time.Second
+const defaultExpiryDelta = 10 * time.Second
 
 // Token represents the credentials used to authorize
 // the requests to access protected resources on the OAuth 2.0
@@ -52,6 +52,11 @@ type Token struct {
 	// raw optionally contains extra metadata from the server
 	// when updating a token.
 	raw interface{}
+
+	// expiryDelta is used to calculate when a token is considered
+	// expired, by subtracting from Expiry. If zero, defaultExpiryDelta
+	// is used.
+	expiryDelta time.Duration
 }
 
 // Type returns t.TokenType if non-empty, else "Bearer".
@@ -127,6 +132,11 @@ func (t *Token) expired() bool {
 	if t.Expiry.IsZero() {
 		return false
 	}
+
+	expiryDelta := defaultExpiryDelta
+	if t.expiryDelta != 0 {
+		expiryDelta = t.expiryDelta
+	}
 	return t.Expiry.Round(0).Add(-expiryDelta).Before(timeNow())
 }
 
diff --git a/vendor/google.golang.org/genproto/googleapis/rpc/status/status.pb.go b/vendor/google.golang.org/genproto/googleapis/rpc/status/status.pb.go
index f34a38e4e..a6b508188 100644
--- a/vendor/google.golang.org/genproto/googleapis/rpc/status/status.pb.go
+++ b/vendor/google.golang.org/genproto/googleapis/rpc/status/status.pb.go
@@ -1,4 +1,4 @@
-// Copyright 2020 Google LLC
+// Copyright 2022 Google LLC
 //
 // Licensed under the Apache License, Version 2.0 (the "License");
 // you may not use this file except in compliance with the License.
@@ -15,7 +15,7 @@
 // Code generated by protoc-gen-go. DO NOT EDIT.
 // versions:
 // 	protoc-gen-go v1.26.0
-// 	protoc        v3.12.2
+// 	protoc        v3.21.9
 // source: google/rpc/status.proto
 
 package status
@@ -48,11 +48,13 @@ type Status struct {
 	sizeCache     protoimpl.SizeCache
 	unknownFields protoimpl.UnknownFields
 
-	// The status code, which should be an enum value of [google.rpc.Code][google.rpc.Code].
+	// The status code, which should be an enum value of
+	// [google.rpc.Code][google.rpc.Code].
 	Code int32 `protobuf:"varint,1,opt,name=code,proto3" json:"code,omitempty"`
 	// A developer-facing error message, which should be in English. Any
 	// user-facing error message should be localized and sent in the
-	// [google.rpc.Status.details][google.rpc.Status.details] field, or localized by the client.
+	// [google.rpc.Status.details][google.rpc.Status.details] field, or localized
+	// by the client.
 	Message string `protobuf:"bytes,2,opt,name=message,proto3" json:"message,omitempty"`
 	// A list of messages that carry the error details.  There is a common set of
 	// message types for APIs to use.
diff --git a/vendor/google.golang.org/grpc/CONTRIBUTING.md b/vendor/google.golang.org/grpc/CONTRIBUTING.md
index 52338d004..608aa6e1a 100644
--- a/vendor/google.golang.org/grpc/CONTRIBUTING.md
+++ b/vendor/google.golang.org/grpc/CONTRIBUTING.md
@@ -20,6 +20,15 @@ How to get your contributions merged smoothly and quickly.
   both author's & review's time is wasted. Create more PRs to address different
   concerns and everyone will be happy.
 
+- If you are searching for features to work on, issues labeled [Status: Help
+  Wanted](https://github.com/grpc/grpc-go/issues?q=is%3Aissue+is%3Aopen+sort%3Aupdated-desc+label%3A%22Status%3A+Help+Wanted%22)
+  is a great place to start. These issues are well-documented and usually can be
+  resolved with a single pull request.
+
+- If you are adding a new file, make sure it has the copyright message template 
+  at the top as a comment. You can copy over the message from an existing file 
+  and update the year.
+
 - The grpc package should only depend on standard Go packages and a small number
   of exceptions. If your contribution introduces new dependencies which are NOT
   in the [list](https://godoc.org/google.golang.org/grpc?imports), you need a
@@ -32,14 +41,18 @@ How to get your contributions merged smoothly and quickly.
 - Provide a good **PR description** as a record of **what** change is being made
   and **why** it was made. Link to a github issue if it exists.
 
-- Don't fix code style and formatting unless you are already changing that line
-  to address an issue. PRs with irrelevant changes won't be merged. If you do
-  want to fix formatting or style, do that in a separate PR.
+- If you want to fix formatting or style, consider whether your changes are an 
+  obvious improvement or might be considered a personal preference. If a style 
+  change is based on preference, it likely will not be accepted. If it corrects 
+  widely agreed-upon anti-patterns, then please do create a PR and explain the 
+  benefits of the change.
 
 - Unless your PR is trivial, you should expect there will be reviewer comments
-  that you'll need to address before merging. We expect you to be reasonably
-  responsive to those comments, otherwise the PR will be closed after 2-3 weeks
-  of inactivity.
+  that you'll need to address before merging. We'll mark it as `Status: Requires
+  Reporter Clarification` if we expect you to respond to these comments in a
+  timely manner. If the PR remains inactive for 6 days, it will be marked as
+  `stale` and automatically close 7 days after that if we don't hear back from
+  you.
 
 - Maintain **clean commit history** and use **meaningful commit messages**. PRs
   with messy commit history are difficult to review and won't be merged. Use
diff --git a/vendor/google.golang.org/grpc/attributes/attributes.go b/vendor/google.golang.org/grpc/attributes/attributes.go
index ae13ddac1..3efca4591 100644
--- a/vendor/google.golang.org/grpc/attributes/attributes.go
+++ b/vendor/google.golang.org/grpc/attributes/attributes.go
@@ -19,12 +19,17 @@
 // Package attributes defines a generic key/value store used in various gRPC
 // components.
 //
-// Experimental
+// # Experimental
 //
 // Notice: This package is EXPERIMENTAL and may be changed or removed in a
 // later release.
 package attributes
 
+import (
+	"fmt"
+	"strings"
+)
+
 // Attributes is an immutable struct for storing and retrieving generic
 // key/value pairs.  Keys must be hashable, and users should define their own
 // types for keys.  Values should not be modified after they are added to an
@@ -99,3 +104,27 @@ func (a *Attributes) Equal(o *Attributes) bool {
 	}
 	return true
 }
+
+// String prints the attribute map. If any key or values throughout the map
+// implement fmt.Stringer, it calls that method and appends.
+func (a *Attributes) String() string {
+	var sb strings.Builder
+	sb.WriteString("{")
+	first := true
+	for k, v := range a.m {
+		var key, val string
+		if str, ok := k.(interface{ String() string }); ok {
+			key = str.String()
+		}
+		if str, ok := v.(interface{ String() string }); ok {
+			val = str.String()
+		}
+		if !first {
+			sb.WriteString(", ")
+		}
+		sb.WriteString(fmt.Sprintf("%q: %q, ", key, val))
+		first = false
+	}
+	sb.WriteString("}")
+	return sb.String()
+}
diff --git a/vendor/google.golang.org/grpc/backoff.go b/vendor/google.golang.org/grpc/backoff.go
index 542594f5c..29475e31c 100644
--- a/vendor/google.golang.org/grpc/backoff.go
+++ b/vendor/google.golang.org/grpc/backoff.go
@@ -48,7 +48,7 @@ type BackoffConfig struct {
 // here for more details:
 // https://github.com/grpc/grpc/blob/master/doc/connection-backoff.md.
 //
-// Experimental
+// # Experimental
 //
 // Notice: This type is EXPERIMENTAL and may be changed or removed in a
 // later release.
diff --git a/vendor/google.golang.org/grpc/balancer/balancer.go b/vendor/google.golang.org/grpc/balancer/balancer.go
index 257139080..8f00523c0 100644
--- a/vendor/google.golang.org/grpc/balancer/balancer.go
+++ b/vendor/google.golang.org/grpc/balancer/balancer.go
@@ -110,6 +110,11 @@ type SubConn interface {
 	UpdateAddresses([]resolver.Address)
 	// Connect starts the connecting for this SubConn.
 	Connect()
+	// GetOrBuildProducer returns a reference to the existing Producer for this
+	// ProducerBuilder in this SubConn, or, if one does not currently exist,
+	// creates a new one and returns it.  Returns a close function which must
+	// be called when the Producer is no longer needed.
+	GetOrBuildProducer(ProducerBuilder) (p Producer, close func())
 }
 
 // NewSubConnOptions contains options to create new SubConn.
@@ -244,7 +249,7 @@ type DoneInfo struct {
 	// ServerLoad is the load received from server. It's usually sent as part of
 	// trailing metadata.
 	//
-	// The only supported type now is *orca_v1.LoadReport.
+	// The only supported type now is *orca_v3.LoadReport.
 	ServerLoad interface{}
 }
 
@@ -274,6 +279,14 @@ type PickResult struct {
 	// type, Done may not be called.  May be nil if the balancer does not wish
 	// to be notified when the RPC completes.
 	Done func(DoneInfo)
+
+	// Metadata provides a way for LB policies to inject arbitrary per-call
+	// metadata. Any metadata returned here will be merged with existing
+	// metadata added by the client application.
+	//
+	// LB policies with child policies are responsible for propagating metadata
+	// injected by their children to the ClientConn, as part of Pick().
+	Metadata metadata.MD
 }
 
 // TransientFailureError returns e.  It exists for backward compatibility and
@@ -371,3 +384,21 @@ type ClientConnState struct {
 // ErrBadResolverState may be returned by UpdateClientConnState to indicate a
 // problem with the provided name resolver data.
 var ErrBadResolverState = errors.New("bad resolver state")
+
+// A ProducerBuilder is a simple constructor for a Producer.  It is used by the
+// SubConn to create producers when needed.
+type ProducerBuilder interface {
+	// Build creates a Producer.  The first parameter is always a
+	// grpc.ClientConnInterface (a type to allow creating RPCs/streams on the
+	// associated SubConn), but is declared as interface{} to avoid a
+	// dependency cycle.  Should also return a close function that will be
+	// called when all references to the Producer have been given up.
+	Build(grpcClientConnInterface interface{}) (p Producer, close func())
+}
+
+// A Producer is a type shared among potentially many consumers.  It is
+// associated with a SubConn, and an implementation will typically contain
+// other methods to provide additional functionality, e.g. configuration or
+// subscription registration.
+type Producer interface {
+}
diff --git a/vendor/google.golang.org/grpc/balancer/base/balancer.go b/vendor/google.golang.org/grpc/balancer/base/balancer.go
index e8dfc828a..3929c26d3 100644
--- a/vendor/google.golang.org/grpc/balancer/base/balancer.go
+++ b/vendor/google.golang.org/grpc/balancer/base/balancer.go
@@ -157,8 +157,8 @@ func (b *baseBalancer) mergeErrors() error {
 
 // regeneratePicker takes a snapshot of the balancer, and generates a picker
 // from it. The picker is
-//  - errPicker if the balancer is in TransientFailure,
-//  - built by the pickerBuilder with all READY SubConns otherwise.
+//   - errPicker if the balancer is in TransientFailure,
+//   - built by the pickerBuilder with all READY SubConns otherwise.
 func (b *baseBalancer) regeneratePicker() {
 	if b.state == connectivity.TransientFailure {
 		b.picker = NewErrPicker(b.mergeErrors())
diff --git a/vendor/google.golang.org/grpc/balancer/conn_state_evaluator.go b/vendor/google.golang.org/grpc/balancer/conn_state_evaluator.go
index a87b6809a..c33413581 100644
--- a/vendor/google.golang.org/grpc/balancer/conn_state_evaluator.go
+++ b/vendor/google.golang.org/grpc/balancer/conn_state_evaluator.go
@@ -34,10 +34,10 @@ type ConnectivityStateEvaluator struct {
 // RecordTransition records state change happening in subConn and based on that
 // it evaluates what aggregated state should be.
 //
-//  - If at least one SubConn in Ready, the aggregated state is Ready;
-//  - Else if at least one SubConn in Connecting, the aggregated state is Connecting;
-//  - Else if at least one SubConn is Idle, the aggregated state is Idle;
-//  - Else if at least one SubConn is TransientFailure (or there are no SubConns), the aggregated state is Transient Failure.
+//   - If at least one SubConn in Ready, the aggregated state is Ready;
+//   - Else if at least one SubConn in Connecting, the aggregated state is Connecting;
+//   - Else if at least one SubConn is Idle, the aggregated state is Idle;
+//   - Else if at least one SubConn is TransientFailure (or there are no SubConns), the aggregated state is Transient Failure.
 //
 // Shutdown is not considered.
 func (cse *ConnectivityStateEvaluator) RecordTransition(oldState, newState connectivity.State) connectivity.State {
@@ -55,7 +55,11 @@ func (cse *ConnectivityStateEvaluator) RecordTransition(oldState, newState conne
 			cse.numIdle += updateVal
 		}
 	}
+	return cse.CurrentState()
+}
 
+// CurrentState returns the current aggregate conn state by evaluating the counters
+func (cse *ConnectivityStateEvaluator) CurrentState() connectivity.State {
 	// Evaluate.
 	if cse.numReady > 0 {
 		return connectivity.Ready
diff --git a/vendor/google.golang.org/grpc/balancer/roundrobin/roundrobin.go b/vendor/google.golang.org/grpc/balancer/roundrobin/roundrobin.go
index 274eb2f85..f7031ad22 100644
--- a/vendor/google.golang.org/grpc/balancer/roundrobin/roundrobin.go
+++ b/vendor/google.golang.org/grpc/balancer/roundrobin/roundrobin.go
@@ -22,7 +22,7 @@
 package roundrobin
 
 import (
-	"sync"
+	"sync/atomic"
 
 	"google.golang.org/grpc/balancer"
 	"google.golang.org/grpc/balancer/base"
@@ -60,7 +60,7 @@ func (*rrPickerBuilder) Build(info base.PickerBuildInfo) balancer.Picker {
 		// Start at a random index, as the same RR balancer rebuilds a new
 		// picker when SubConn states change, and we don't want to apply excess
 		// load to the first server in the list.
-		next: grpcrand.Intn(len(scs)),
+		next: uint32(grpcrand.Intn(len(scs))),
 	}
 }
 
@@ -69,15 +69,13 @@ type rrPicker struct {
 	// created. The slice is immutable. Each Get() will do a round robin
 	// selection from it and return the selected SubConn.
 	subConns []balancer.SubConn
-
-	mu   sync.Mutex
-	next int
+	next     uint32
 }
 
 func (p *rrPicker) Pick(balancer.PickInfo) (balancer.PickResult, error) {
-	p.mu.Lock()
-	sc := p.subConns[p.next]
-	p.next = (p.next + 1) % len(p.subConns)
-	p.mu.Unlock()
+	subConnsLen := uint32(len(p.subConns))
+	nextIndex := atomic.AddUint32(&p.next, 1)
+
+	sc := p.subConns[nextIndex%subConnsLen]
 	return balancer.PickResult{SubConn: sc}, nil
 }
diff --git a/vendor/google.golang.org/grpc/balancer_conn_wrappers.go b/vendor/google.golang.org/grpc/balancer_conn_wrappers.go
index b1c23eaae..04b9ad411 100644
--- a/vendor/google.golang.org/grpc/balancer_conn_wrappers.go
+++ b/vendor/google.golang.org/grpc/balancer_conn_wrappers.go
@@ -19,6 +19,7 @@
 package grpc
 
 import (
+	"context"
 	"fmt"
 	"strings"
 	"sync"
@@ -26,12 +27,20 @@ import (
 	"google.golang.org/grpc/balancer"
 	"google.golang.org/grpc/connectivity"
 	"google.golang.org/grpc/internal/balancer/gracefulswitch"
-	"google.golang.org/grpc/internal/buffer"
 	"google.golang.org/grpc/internal/channelz"
 	"google.golang.org/grpc/internal/grpcsync"
 	"google.golang.org/grpc/resolver"
 )
 
+type ccbMode int
+
+const (
+	ccbModeActive = iota
+	ccbModeIdle
+	ccbModeClosed
+	ccbModeExitingIdle
+)
+
 // ccBalancerWrapper sits between the ClientConn and the Balancer.
 //
 // ccBalancerWrapper implements methods corresponding to the ones on the
@@ -46,192 +55,101 @@ import (
 // It uses the gracefulswitch.Balancer internally to ensure that balancer
 // switches happen in a graceful manner.
 type ccBalancerWrapper struct {
-	cc *ClientConn
-
-	// Since these fields are accessed only from handleXxx() methods which are
-	// synchronized by the watcher goroutine, we do not need a mutex to protect
-	// these fields.
+	// The following fields are initialized when the wrapper is created and are
+	// read-only afterwards, and therefore can be accessed without a mutex.
+	cc   *ClientConn
+	opts balancer.BuildOptions
+
+	// Outgoing (gRPC --> balancer) calls are guaranteed to execute in a
+	// mutually exclusive manner as they are scheduled in the serializer. Fields
+	// accessed *only* in these serializer callbacks, can therefore be accessed
+	// without a mutex.
 	balancer        *gracefulswitch.Balancer
 	curBalancerName string
 
-	updateCh *buffer.Unbounded // Updates written on this channel are processed by watcher().
-	resultCh *buffer.Unbounded // Results of calls to UpdateClientConnState() are pushed here.
-	closed   *grpcsync.Event   // Indicates if close has been called.
-	done     *grpcsync.Event   // Indicates if close has completed its work.
+	// mu guards access to the below fields. Access to the serializer and its
+	// cancel function needs to be mutex protected because they are overwritten
+	// when the wrapper exits idle mode.
+	mu               sync.Mutex
+	serializer       *grpcsync.CallbackSerializer // To serialize all outoing calls.
+	serializerCancel context.CancelFunc           // To close the seralizer at close/enterIdle time.
+	mode             ccbMode                      // Tracks the current mode of the wrapper.
 }
 
 // newCCBalancerWrapper creates a new balancer wrapper. The underlying balancer
 // is not created until the switchTo() method is invoked.
 func newCCBalancerWrapper(cc *ClientConn, bopts balancer.BuildOptions) *ccBalancerWrapper {
+	ctx, cancel := context.WithCancel(context.Background())
 	ccb := &ccBalancerWrapper{
-		cc:       cc,
-		updateCh: buffer.NewUnbounded(),
-		resultCh: buffer.NewUnbounded(),
-		closed:   grpcsync.NewEvent(),
-		done:     grpcsync.NewEvent(),
+		cc:               cc,
+		opts:             bopts,
+		serializer:       grpcsync.NewCallbackSerializer(ctx),
+		serializerCancel: cancel,
 	}
-	go ccb.watcher()
 	ccb.balancer = gracefulswitch.NewBalancer(ccb, bopts)
 	return ccb
 }
 
-// The following xxxUpdate structs wrap the arguments received as part of the
-// corresponding update. The watcher goroutine uses the 'type' of the update to
-// invoke the appropriate handler routine to handle the update.
-
-type ccStateUpdate struct {
-	ccs *balancer.ClientConnState
-}
-
-type scStateUpdate struct {
-	sc    balancer.SubConn
-	state connectivity.State
-	err   error
-}
-
-type exitIdleUpdate struct{}
-
-type resolverErrorUpdate struct {
-	err error
-}
-
-type switchToUpdate struct {
-	name string
-}
-
-type subConnUpdate struct {
-	acbw *acBalancerWrapper
-}
-
-// watcher is a long-running goroutine which reads updates from a channel and
-// invokes corresponding methods on the underlying balancer. It ensures that
-// these methods are invoked in a synchronous fashion. It also ensures that
-// these methods are invoked in the order in which the updates were received.
-func (ccb *ccBalancerWrapper) watcher() {
-	for {
-		select {
-		case u := <-ccb.updateCh.Get():
-			ccb.updateCh.Load()
-			if ccb.closed.HasFired() {
-				break
-			}
-			switch update := u.(type) {
-			case *ccStateUpdate:
-				ccb.handleClientConnStateChange(update.ccs)
-			case *scStateUpdate:
-				ccb.handleSubConnStateChange(update)
-			case *exitIdleUpdate:
-				ccb.handleExitIdle()
-			case *resolverErrorUpdate:
-				ccb.handleResolverError(update.err)
-			case *switchToUpdate:
-				ccb.handleSwitchTo(update.name)
-			case *subConnUpdate:
-				ccb.handleRemoveSubConn(update.acbw)
-			default:
-				logger.Errorf("ccBalancerWrapper.watcher: unknown update %+v, type %T", update, update)
-			}
-		case <-ccb.closed.Done():
-		}
-
-		if ccb.closed.HasFired() {
-			ccb.handleClose()
-			return
-		}
-	}
-}
-
 // updateClientConnState is invoked by grpc to push a ClientConnState update to
 // the underlying balancer.
-//
-// Unlike other methods invoked by grpc to push updates to the underlying
-// balancer, this method cannot simply push the update onto the update channel
-// and return. It needs to return the error returned by the underlying balancer
-// back to grpc which propagates that to the resolver.
 func (ccb *ccBalancerWrapper) updateClientConnState(ccs *balancer.ClientConnState) error {
-	ccb.updateCh.Put(&ccStateUpdate{ccs: ccs})
-
-	var res interface{}
-	select {
-	case res = <-ccb.resultCh.Get():
-		ccb.resultCh.Load()
-	case <-ccb.closed.Done():
-		// Return early if the balancer wrapper is closed while we are waiting for
-		// the underlying balancer to process a ClientConnState update.
-		return nil
-	}
-	// If the returned error is nil, attempting to type assert to error leads to
-	// panic. So, this needs to handled separately.
-	if res == nil {
-		return nil
-	}
-	return res.(error)
-}
-
-// handleClientConnStateChange handles a ClientConnState update from the update
-// channel and invokes the appropriate method on the underlying balancer.
-//
-// If the addresses specified in the update contain addresses of type "grpclb"
-// and the selected LB policy is not "grpclb", these addresses will be filtered
-// out and ccs will be modified with the updated address list.
-func (ccb *ccBalancerWrapper) handleClientConnStateChange(ccs *balancer.ClientConnState) {
-	if ccb.curBalancerName != grpclbName {
-		// Filter any grpclb addresses since we don't have the grpclb balancer.
-		var addrs []resolver.Address
-		for _, addr := range ccs.ResolverState.Addresses {
-			if addr.Type == resolver.GRPCLB {
-				continue
+	ccb.mu.Lock()
+	errCh := make(chan error, 1)
+	// Here and everywhere else where Schedule() is called, it is done with the
+	// lock held. But the lock guards only the scheduling part. The actual
+	// callback is called asynchronously without the lock being held.
+	ok := ccb.serializer.Schedule(func(_ context.Context) {
+		// If the addresses specified in the update contain addresses of type
+		// "grpclb" and the selected LB policy is not "grpclb", these addresses
+		// will be filtered out and ccs will be modified with the updated
+		// address list.
+		if ccb.curBalancerName != grpclbName {
+			var addrs []resolver.Address
+			for _, addr := range ccs.ResolverState.Addresses {
+				if addr.Type == resolver.GRPCLB {
+					continue
+				}
+				addrs = append(addrs, addr)
 			}
-			addrs = append(addrs, addr)
+			ccs.ResolverState.Addresses = addrs
 		}
-		ccs.ResolverState.Addresses = addrs
+		errCh <- ccb.balancer.UpdateClientConnState(*ccs)
+	})
+	if !ok {
+		// If we are unable to schedule a function with the serializer, it
+		// indicates that it has been closed. A serializer is only closed when
+		// the wrapper is closed or is in idle.
+		ccb.mu.Unlock()
+		return fmt.Errorf("grpc: cannot send state update to a closed or idle balancer")
 	}
-	ccb.resultCh.Put(ccb.balancer.UpdateClientConnState(*ccs))
+	ccb.mu.Unlock()
+
+	// We get here only if the above call to Schedule succeeds, in which case it
+	// is guaranteed that the scheduled function will run. Therefore it is safe
+	// to block on this channel.
+	err := <-errCh
+	if logger.V(2) && err != nil {
+		logger.Infof("error from balancer.UpdateClientConnState: %v", err)
+	}
+	return err
 }
 
 // updateSubConnState is invoked by grpc to push a subConn state update to the
 // underlying balancer.
 func (ccb *ccBalancerWrapper) updateSubConnState(sc balancer.SubConn, s connectivity.State, err error) {
-	// When updating addresses for a SubConn, if the address in use is not in
-	// the new addresses, the old ac will be tearDown() and a new ac will be
-	// created. tearDown() generates a state change with Shutdown state, we
-	// don't want the balancer to receive this state change. So before
-	// tearDown() on the old ac, ac.acbw (acWrapper) will be set to nil, and
-	// this function will be called with (nil, Shutdown). We don't need to call
-	// balancer method in this case.
-	if sc == nil {
-		return
-	}
-	ccb.updateCh.Put(&scStateUpdate{
-		sc:    sc,
-		state: s,
-		err:   err,
+	ccb.mu.Lock()
+	ccb.serializer.Schedule(func(_ context.Context) {
+		ccb.balancer.UpdateSubConnState(sc, balancer.SubConnState{ConnectivityState: s, ConnectionError: err})
 	})
-}
-
-// handleSubConnStateChange handles a SubConnState update from the update
-// channel and invokes the appropriate method on the underlying balancer.
-func (ccb *ccBalancerWrapper) handleSubConnStateChange(update *scStateUpdate) {
-	ccb.balancer.UpdateSubConnState(update.sc, balancer.SubConnState{ConnectivityState: update.state, ConnectionError: update.err})
-}
-
-func (ccb *ccBalancerWrapper) exitIdle() {
-	ccb.updateCh.Put(&exitIdleUpdate{})
-}
-
-func (ccb *ccBalancerWrapper) handleExitIdle() {
-	if ccb.cc.GetState() != connectivity.Idle {
-		return
-	}
-	ccb.balancer.ExitIdle()
+	ccb.mu.Unlock()
 }
 
 func (ccb *ccBalancerWrapper) resolverError(err error) {
-	ccb.updateCh.Put(&resolverErrorUpdate{err: err})
-}
-
-func (ccb *ccBalancerWrapper) handleResolverError(err error) {
-	ccb.balancer.ResolverError(err)
+	ccb.mu.Lock()
+	ccb.serializer.Schedule(func(_ context.Context) {
+		ccb.balancer.ResolverError(err)
+	})
+	ccb.mu.Unlock()
 }
 
 // switchTo is invoked by grpc to instruct the balancer wrapper to switch to the
@@ -245,24 +163,27 @@ func (ccb *ccBalancerWrapper) handleResolverError(err error) {
 // the ccBalancerWrapper keeps track of the current LB policy name, and skips
 // the graceful balancer switching process if the name does not change.
 func (ccb *ccBalancerWrapper) switchTo(name string) {
-	ccb.updateCh.Put(&switchToUpdate{name: name})
+	ccb.mu.Lock()
+	ccb.serializer.Schedule(func(_ context.Context) {
+		// TODO: Other languages use case-sensitive balancer registries. We should
+		// switch as well. See: https://github.com/grpc/grpc-go/issues/5288.
+		if strings.EqualFold(ccb.curBalancerName, name) {
+			return
+		}
+		ccb.buildLoadBalancingPolicy(name)
+	})
+	ccb.mu.Unlock()
 }
 
-// handleSwitchTo handles a balancer switch update from the update channel. It
-// calls the SwitchTo() method on the gracefulswitch.Balancer with a
-// balancer.Builder corresponding to name. If no balancer.Builder is registered
-// for the given name, it uses the default LB policy which is "pick_first".
-func (ccb *ccBalancerWrapper) handleSwitchTo(name string) {
-	// TODO: Other languages use case-insensitive balancer registries. We should
-	// switch as well. See: https://github.com/grpc/grpc-go/issues/5288.
-	if strings.EqualFold(ccb.curBalancerName, name) {
-		return
-	}
-
-	// TODO: Ensure that name is a registered LB policy when we get here.
-	// We currently only validate the `loadBalancingConfig` field. We need to do
-	// the same for the `loadBalancingPolicy` field and reject the service config
-	// if the specified policy is not registered.
+// buildLoadBalancingPolicy performs the following:
+//   - retrieve a balancer builder for the given name. Use the default LB
+//     policy, pick_first, if no LB policy with name is found in the registry.
+//   - instruct the gracefulswitch balancer to switch to the above builder. This
+//     will actually build the new balancer.
+//   - update the `curBalancerName` field
+//
+// Must be called from a serializer callback.
+func (ccb *ccBalancerWrapper) buildLoadBalancingPolicy(name string) {
 	builder := balancer.Get(name)
 	if builder == nil {
 		channelz.Warningf(logger, ccb.cc.channelzID, "Channel switches to new LB policy %q, since the specified LB policy %q was not registered", PickFirstBalancerName, name)
@@ -278,26 +199,114 @@ func (ccb *ccBalancerWrapper) handleSwitchTo(name string) {
 	ccb.curBalancerName = builder.Name()
 }
 
-// handleRemoveSucConn handles a request from the underlying balancer to remove
-// a subConn.
-//
-// See comments in RemoveSubConn() for more details.
-func (ccb *ccBalancerWrapper) handleRemoveSubConn(acbw *acBalancerWrapper) {
-	ccb.cc.removeAddrConn(acbw.getAddrConn(), errConnDrain)
+func (ccb *ccBalancerWrapper) close() {
+	channelz.Info(logger, ccb.cc.channelzID, "ccBalancerWrapper: closing")
+	ccb.closeBalancer(ccbModeClosed)
 }
 
-func (ccb *ccBalancerWrapper) close() {
-	ccb.closed.Fire()
-	<-ccb.done.Done()
+// enterIdleMode is invoked by grpc when the channel enters idle mode upon
+// expiry of idle_timeout. This call blocks until the balancer is closed.
+func (ccb *ccBalancerWrapper) enterIdleMode() {
+	channelz.Info(logger, ccb.cc.channelzID, "ccBalancerWrapper: entering idle mode")
+	ccb.closeBalancer(ccbModeIdle)
 }
 
-func (ccb *ccBalancerWrapper) handleClose() {
-	ccb.balancer.Close()
-	ccb.done.Fire()
+// closeBalancer is invoked when the channel is being closed or when it enters
+// idle mode upon expiry of idle_timeout.
+func (ccb *ccBalancerWrapper) closeBalancer(m ccbMode) {
+	ccb.mu.Lock()
+	if ccb.mode == ccbModeClosed || ccb.mode == ccbModeIdle {
+		ccb.mu.Unlock()
+		return
+	}
+
+	ccb.mode = m
+	done := ccb.serializer.Done
+	b := ccb.balancer
+	ok := ccb.serializer.Schedule(func(_ context.Context) {
+		// Close the serializer to ensure that no more calls from gRPC are sent
+		// to the balancer.
+		ccb.serializerCancel()
+		// Empty the current balancer name because we don't have a balancer
+		// anymore and also so that we act on the next call to switchTo by
+		// creating a new balancer specified by the new resolver.
+		ccb.curBalancerName = ""
+	})
+	if !ok {
+		ccb.mu.Unlock()
+		return
+	}
+	ccb.mu.Unlock()
+
+	// Give enqueued callbacks a chance to finish.
+	<-done
+	// Spawn a goroutine to close the balancer (since it may block trying to
+	// cleanup all allocated resources) and return early.
+	go b.Close()
+}
+
+// exitIdleMode is invoked by grpc when the channel exits idle mode either
+// because of an RPC or because of an invocation of the Connect() API. This
+// recreates the balancer that was closed previously when entering idle mode.
+//
+// If the channel is not in idle mode, we know for a fact that we are here as a
+// result of the user calling the Connect() method on the ClientConn. In this
+// case, we can simply forward the call to the underlying balancer, instructing
+// it to reconnect to the backends.
+func (ccb *ccBalancerWrapper) exitIdleMode() {
+	ccb.mu.Lock()
+	if ccb.mode == ccbModeClosed {
+		// Request to exit idle is a no-op when wrapper is already closed.
+		ccb.mu.Unlock()
+		return
+	}
+
+	if ccb.mode == ccbModeIdle {
+		// Recreate the serializer which was closed when we entered idle.
+		ctx, cancel := context.WithCancel(context.Background())
+		ccb.serializer = grpcsync.NewCallbackSerializer(ctx)
+		ccb.serializerCancel = cancel
+	}
+
+	// The ClientConn guarantees that mutual exclusion between close() and
+	// exitIdleMode(), and since we just created a new serializer, we can be
+	// sure that the below function will be scheduled.
+	done := make(chan struct{})
+	ccb.serializer.Schedule(func(_ context.Context) {
+		defer close(done)
+
+		ccb.mu.Lock()
+		defer ccb.mu.Unlock()
+
+		if ccb.mode != ccbModeIdle {
+			ccb.balancer.ExitIdle()
+			return
+		}
+
+		// Gracefulswitch balancer does not support a switchTo operation after
+		// being closed. Hence we need to create a new one here.
+		ccb.balancer = gracefulswitch.NewBalancer(ccb, ccb.opts)
+		ccb.mode = ccbModeActive
+		channelz.Info(logger, ccb.cc.channelzID, "ccBalancerWrapper: exiting idle mode")
+
+	})
+	ccb.mu.Unlock()
+
+	<-done
+}
+
+func (ccb *ccBalancerWrapper) isIdleOrClosed() bool {
+	ccb.mu.Lock()
+	defer ccb.mu.Unlock()
+	return ccb.mode == ccbModeIdle || ccb.mode == ccbModeClosed
 }
 
 func (ccb *ccBalancerWrapper) NewSubConn(addrs []resolver.Address, opts balancer.NewSubConnOptions) (balancer.SubConn, error) {
-	if len(addrs) <= 0 {
+	if ccb.isIdleOrClosed() {
+		return nil, fmt.Errorf("grpc: cannot create SubConn when balancer is closed or idle")
+	}
+
+	if len(addrs) == 0 {
 		return nil, fmt.Errorf("grpc: cannot create SubConn with empty address list")
 	}
 	ac, err := ccb.cc.newAddrConn(addrs, opts)
@@ -305,32 +314,36 @@ func (ccb *ccBalancerWrapper) NewSubConn(addrs []resolver.Address, opts balancer
 		channelz.Warningf(logger, ccb.cc.channelzID, "acBalancerWrapper: NewSubConn: failed to newAddrConn: %v", err)
 		return nil, err
 	}
-	acbw := &acBalancerWrapper{ac: ac}
-	acbw.ac.mu.Lock()
+	acbw := &acBalancerWrapper{ac: ac, producers: make(map[balancer.ProducerBuilder]*refCountedProducer)}
 	ac.acbw = acbw
-	acbw.ac.mu.Unlock()
 	return acbw, nil
 }
 
 func (ccb *ccBalancerWrapper) RemoveSubConn(sc balancer.SubConn) {
-	// Before we switched the ccBalancerWrapper to use gracefulswitch.Balancer, it
-	// was required to handle the RemoveSubConn() method asynchronously by pushing
-	// the update onto the update channel. This was done to avoid a deadlock as
-	// switchBalancer() was holding cc.mu when calling Close() on the old
-	// balancer, which would in turn call RemoveSubConn().
-	//
-	// With the use of gracefulswitch.Balancer in ccBalancerWrapper, handling this
-	// asynchronously is probably not required anymore since the switchTo() method
-	// handles the balancer switch by pushing the update onto the channel.
-	// TODO(easwars): Handle this inline.
+	if ccb.isIdleOrClosed() {
+		// It it safe to ignore this call when the balancer is closed or in idle
+		// because the ClientConn takes care of closing the connections.
+		//
+		// Not returning early from here when the balancer is closed or in idle
+		// leads to a deadlock though, because of the following sequence of
+		// calls when holding cc.mu:
+		// cc.exitIdleMode --> ccb.enterIdleMode --> gsw.Close -->
+		// ccb.RemoveAddrConn --> cc.removeAddrConn
+		return
+	}
+
 	acbw, ok := sc.(*acBalancerWrapper)
 	if !ok {
 		return
 	}
-	ccb.updateCh.Put(&subConnUpdate{acbw: acbw})
+	ccb.cc.removeAddrConn(acbw.ac, errConnDrain)
 }
 
 func (ccb *ccBalancerWrapper) UpdateAddresses(sc balancer.SubConn, addrs []resolver.Address) {
+	if ccb.isIdleOrClosed() {
+		return
+	}
+
 	acbw, ok := sc.(*acBalancerWrapper)
 	if !ok {
 		return
@@ -339,6 +352,10 @@ func (ccb *ccBalancerWrapper) UpdateAddresses(sc balancer.SubConn, addrs []resol
 }
 
 func (ccb *ccBalancerWrapper) UpdateState(s balancer.State) {
+	if ccb.isIdleOrClosed() {
+		return
+	}
+
 	// Update picker before updating state.  Even though the ordering here does
 	// not matter, it can lead to multiple calls of Pick in the common start-up
 	// case where we wait for ready and then perform an RPC.  If the picker is
@@ -349,6 +366,10 @@ func (ccb *ccBalancerWrapper) UpdateState(s balancer.State) {
 }
 
 func (ccb *ccBalancerWrapper) ResolveNow(o resolver.ResolveNowOptions) {
+	if ccb.isIdleOrClosed() {
+		return
+	}
+
 	ccb.cc.resolveNow(o)
 }
 
@@ -359,58 +380,80 @@ func (ccb *ccBalancerWrapper) Target() string {
 // acBalancerWrapper is a wrapper on top of ac for balancers.
 // It implements balancer.SubConn interface.
 type acBalancerWrapper struct {
-	mu sync.Mutex
-	ac *addrConn
+	ac *addrConn // read-only
+
+	mu        sync.Mutex
+	producers map[balancer.ProducerBuilder]*refCountedProducer
+}
+
+func (acbw *acBalancerWrapper) String() string {
+	return fmt.Sprintf("SubConn(id:%d)", acbw.ac.channelzID.Int())
 }
 
 func (acbw *acBalancerWrapper) UpdateAddresses(addrs []resolver.Address) {
-	acbw.mu.Lock()
-	defer acbw.mu.Unlock()
-	if len(addrs) <= 0 {
-		acbw.ac.cc.removeAddrConn(acbw.ac, errConnDrain)
-		return
+	acbw.ac.updateAddrs(addrs)
+}
+
+func (acbw *acBalancerWrapper) Connect() {
+	go acbw.ac.connect()
+}
+
+// NewStream begins a streaming RPC on the addrConn.  If the addrConn is not
+// ready, blocks until it is or ctx expires.  Returns an error when the context
+// expires or the addrConn is shut down.
+func (acbw *acBalancerWrapper) NewStream(ctx context.Context, desc *StreamDesc, method string, opts ...CallOption) (ClientStream, error) {
+	transport, err := acbw.ac.getTransport(ctx)
+	if err != nil {
+		return nil, err
 	}
-	if !acbw.ac.tryUpdateAddrs(addrs) {
-		cc := acbw.ac.cc
-		opts := acbw.ac.scopts
-		acbw.ac.mu.Lock()
-		// Set old ac.acbw to nil so the Shutdown state update will be ignored
-		// by balancer.
-		//
-		// TODO(bar) the state transition could be wrong when tearDown() old ac
-		// and creating new ac, fix the transition.
-		acbw.ac.acbw = nil
-		acbw.ac.mu.Unlock()
-		acState := acbw.ac.getState()
-		acbw.ac.cc.removeAddrConn(acbw.ac, errConnDrain)
-
-		if acState == connectivity.Shutdown {
-			return
-		}
+	return newNonRetryClientStream(ctx, desc, method, transport, acbw.ac, opts...)
+}
 
-		newAC, err := cc.newAddrConn(addrs, opts)
-		if err != nil {
-			channelz.Warningf(logger, acbw.ac.channelzID, "acBalancerWrapper: UpdateAddresses: failed to newAddrConn: %v", err)
-			return
-		}
-		acbw.ac = newAC
-		newAC.mu.Lock()
-		newAC.acbw = acbw
-		newAC.mu.Unlock()
-		if acState != connectivity.Idle {
-			go newAC.connect()
-		}
+// Invoke performs a unary RPC.  If the addrConn is not ready, returns
+// errSubConnNotReady.
+func (acbw *acBalancerWrapper) Invoke(ctx context.Context, method string, args interface{}, reply interface{}, opts ...CallOption) error {
+	cs, err := acbw.NewStream(ctx, unaryStreamDesc, method, opts...)
+	if err != nil {
+		return err
+	}
+	if err := cs.SendMsg(args); err != nil {
+		return err
 	}
+	return cs.RecvMsg(reply)
 }
 
-func (acbw *acBalancerWrapper) Connect() {
-	acbw.mu.Lock()
-	defer acbw.mu.Unlock()
-	go acbw.ac.connect()
+type refCountedProducer struct {
+	producer balancer.Producer
+	refs     int    // number of current refs to the producer
+	close    func() // underlying producer's close function
 }
 
-func (acbw *acBalancerWrapper) getAddrConn() *addrConn {
+func (acbw *acBalancerWrapper) GetOrBuildProducer(pb balancer.ProducerBuilder) (balancer.Producer, func()) {
 	acbw.mu.Lock()
 	defer acbw.mu.Unlock()
-	return acbw.ac
+
+	// Look up existing producer from this builder.
+	pData := acbw.producers[pb]
+	if pData == nil {
+		// Not found; create a new one and add it to the producers map.
+		p, close := pb.Build(acbw)
+		pData = &refCountedProducer{producer: p, close: close}
+		acbw.producers[pb] = pData
+	}
+	// Account for this new reference.
+	pData.refs++
+
+	// Return a cleanup function wrapped in a OnceFunc to remove this reference
+	// and delete the refCountedProducer from the map if the total reference
+	// count goes to zero.
+	unref := func() {
+		acbw.mu.Lock()
+		pData.refs--
+		if pData.refs == 0 {
+			defer pData.close() // Run outside the acbw mutex
+			delete(acbw.producers, pb)
+		}
+		acbw.mu.Unlock()
+	}
+	return pData.producer, grpcsync.OnceFunc(unref)
 }
diff --git a/vendor/google.golang.org/grpc/binarylog/grpc_binarylog_v1/binarylog.pb.go b/vendor/google.golang.org/grpc/binarylog/grpc_binarylog_v1/binarylog.pb.go
index ed75290cd..ec2c2fa14 100644
--- a/vendor/google.golang.org/grpc/binarylog/grpc_binarylog_v1/binarylog.pb.go
+++ b/vendor/google.golang.org/grpc/binarylog/grpc_binarylog_v1/binarylog.pb.go
@@ -18,14 +18,13 @@
 
 // Code generated by protoc-gen-go. DO NOT EDIT.
 // versions:
-// 	protoc-gen-go v1.25.0
-// 	protoc        v3.14.0
+// 	protoc-gen-go v1.30.0
+// 	protoc        v4.22.0
 // source: grpc/binlog/v1/binarylog.proto
 
 package grpc_binarylog_v1
 
 import (
-	proto "github.com/golang/protobuf/proto"
 	protoreflect "google.golang.org/protobuf/reflect/protoreflect"
 	protoimpl "google.golang.org/protobuf/runtime/protoimpl"
 	durationpb "google.golang.org/protobuf/types/known/durationpb"
@@ -41,10 +40,6 @@ const (
 	_ = protoimpl.EnforceVersion(protoimpl.MaxVersion - 20)
 )
 
-// This is a compile-time assertion that a sufficiently up-to-date version
-// of the legacy proto package is being used.
-const _ = proto.ProtoPackageIsVersion4
-
 // Enumerates the type of event
 // Note the terminology is different from the RPC semantics
 // definition, but the same meaning is expressed here.
@@ -261,6 +256,7 @@ type GrpcLogEntry struct {
 	// according to the type of the log entry.
 	//
 	// Types that are assignable to Payload:
+	//
 	//	*GrpcLogEntry_ClientHeader
 	//	*GrpcLogEntry_ServerHeader
 	//	*GrpcLogEntry_Message
@@ -694,12 +690,12 @@ func (x *Message) GetData() []byte {
 // Header keys added by gRPC are omitted. To be more specific,
 // implementations will not log the following entries, and this is
 // not to be treated as a truncation:
-// - entries handled by grpc that are not user visible, such as those
-//   that begin with 'grpc-' (with exception of grpc-trace-bin)
-//   or keys like 'lb-token'
-// - transport specific entries, including but not limited to:
-//   ':path', ':authority', 'content-encoding', 'user-agent', 'te', etc
-// - entries added for call credentials
+//   - entries handled by grpc that are not user visible, such as those
+//     that begin with 'grpc-' (with exception of grpc-trace-bin)
+//     or keys like 'lb-token'
+//   - transport specific entries, including but not limited to:
+//     ':path', ':authority', 'content-encoding', 'user-agent', 'te', etc
+//   - entries added for call credentials
 //
 // Implementations must always log grpc-trace-bin if it is present.
 // Practically speaking it will only be visible on server side because
diff --git a/vendor/google.golang.org/grpc/call.go b/vendor/google.golang.org/grpc/call.go
index 9e20e4d38..e6a1dc5d7 100644
--- a/vendor/google.golang.org/grpc/call.go
+++ b/vendor/google.golang.org/grpc/call.go
@@ -27,6 +27,11 @@ import (
 //
 // All errors returned by Invoke are compatible with the status package.
 func (cc *ClientConn) Invoke(ctx context.Context, method string, args, reply interface{}, opts ...CallOption) error {
+	if err := cc.idlenessMgr.onCallBegin(); err != nil {
+		return err
+	}
+	defer cc.idlenessMgr.onCallEnd()
+
 	// allow interceptor to see all applicable call options, which means those
 	// configured as defaults from dial option as well as per-call options
 	opts = combine(cc.dopts.callOptions, opts)
diff --git a/vendor/google.golang.org/grpc/channelz/channelz.go b/vendor/google.golang.org/grpc/channelz/channelz.go
index a220c47c5..32b7fa579 100644
--- a/vendor/google.golang.org/grpc/channelz/channelz.go
+++ b/vendor/google.golang.org/grpc/channelz/channelz.go
@@ -23,7 +23,7 @@
 // https://github.com/grpc/proposal/blob/master/A14-channelz.md, is provided by
 // the `internal/channelz` package.
 //
-// Experimental
+// # Experimental
 //
 // Notice: All APIs in this package are experimental and may be removed in a
 // later release.
diff --git a/vendor/google.golang.org/grpc/clientconn.go b/vendor/google.golang.org/grpc/clientconn.go
index 779b03bca..95a7459b0 100644
--- a/vendor/google.golang.org/grpc/clientconn.go
+++ b/vendor/google.golang.org/grpc/clientconn.go
@@ -24,7 +24,6 @@ import (
 	"fmt"
 	"math"
 	"net/url"
-	"reflect"
 	"strings"
 	"sync"
 	"sync/atomic"
@@ -69,6 +68,9 @@ var (
 	errConnDrain = errors.New("grpc: the connection is drained")
 	// errConnClosing indicates that the connection is closing.
 	errConnClosing = errors.New("grpc: the connection is closing")
+	// errConnIdling indicates the the connection is being closed as the channel
+	// is moving to an idle mode due to inactivity.
+	errConnIdling = errors.New("grpc: the connection is closing due to channel idleness")
 	// invalidDefaultServiceConfigErrPrefix is used to prefix the json parsing error for the default
 	// service config.
 	invalidDefaultServiceConfigErrPrefix = "grpc: the provided default service config is invalid"
@@ -134,20 +136,42 @@ func (dcs *defaultConfigSelector) SelectConfig(rpcInfo iresolver.RPCInfo) (*ires
 // e.g. to use dns resolver, a "dns:///" prefix should be applied to the target.
 func DialContext(ctx context.Context, target string, opts ...DialOption) (conn *ClientConn, err error) {
 	cc := &ClientConn{
-		target:            target,
-		csMgr:             &connectivityStateManager{},
-		conns:             make(map[*addrConn]struct{}),
-		dopts:             defaultDialOptions(),
-		blockingpicker:    newPickerWrapper(),
-		czData:            new(channelzData),
-		firstResolveEvent: grpcsync.NewEvent(),
-	}
+		target: target,
+		csMgr:  &connectivityStateManager{},
+		conns:  make(map[*addrConn]struct{}),
+		dopts:  defaultDialOptions(),
+		czData: new(channelzData),
+	}
+
+	// We start the channel off in idle mode, but kick it out of idle at the end
+	// of this method, instead of waiting for the first RPC. Other gRPC
+	// implementations do wait for the first RPC to kick the channel out of
+	// idle. But doing so would be a major behavior change for our users who are
+	// used to seeing the channel active after Dial.
+	//
+	// Taking this approach of kicking it out of idle at the end of this method
+	// allows us to share the code between channel creation and exiting idle
+	// mode. This will also make it easy for us to switch to starting the
+	// channel off in idle, if at all we ever get to do that.
+	cc.idlenessState = ccIdlenessStateIdle
+
 	cc.retryThrottler.Store((*retryThrottler)(nil))
 	cc.safeConfigSelector.UpdateConfigSelector(&defaultConfigSelector{nil})
 	cc.ctx, cc.cancel = context.WithCancel(context.Background())
+	cc.exitIdleCond = sync.NewCond(&cc.mu)
 
-	for _, opt := range extraDialOptions {
-		opt.apply(&cc.dopts)
+	disableGlobalOpts := false
+	for _, opt := range opts {
+		if _, ok := opt.(*disableGlobalDialOptions); ok {
+			disableGlobalOpts = true
+			break
+		}
+	}
+
+	if !disableGlobalOpts {
+		for _, opt := range globalDialOptions {
+			opt.apply(&cc.dopts)
+		}
 	}
 
 	for _, opt := range opts {
@@ -163,40 +187,11 @@ func DialContext(ctx context.Context, target string, opts ...DialOption) (conn *
 		}
 	}()
 
-	pid := cc.dopts.channelzParentID
-	cc.channelzID = channelz.RegisterChannel(&channelzChannel{cc}, pid, target)
-	ted := &channelz.TraceEventDesc{
-		Desc:     "Channel created",
-		Severity: channelz.CtInfo,
-	}
-	if cc.dopts.channelzParentID != nil {
-		ted.Parent = &channelz.TraceEventDesc{
-			Desc:     fmt.Sprintf("Nested Channel(id:%d) created", cc.channelzID.Int()),
-			Severity: channelz.CtInfo,
-		}
-	}
-	channelz.AddTraceEvent(logger, cc.channelzID, 1, ted)
-	cc.csMgr.channelzID = cc.channelzID
+	// Register ClientConn with channelz.
+	cc.channelzRegistration(target)
 
-	if cc.dopts.copts.TransportCredentials == nil && cc.dopts.copts.CredsBundle == nil {
-		return nil, errNoTransportSecurity
-	}
-	if cc.dopts.copts.TransportCredentials != nil && cc.dopts.copts.CredsBundle != nil {
-		return nil, errTransportCredsAndBundle
-	}
-	if cc.dopts.copts.CredsBundle != nil && cc.dopts.copts.CredsBundle.TransportCredentials() == nil {
-		return nil, errNoTransportCredsInBundle
-	}
-	transportCreds := cc.dopts.copts.TransportCredentials
-	if transportCreds == nil {
-		transportCreds = cc.dopts.copts.CredsBundle.TransportCredentials()
-	}
-	if transportCreds.Info().SecurityProtocol == "insecure" {
-		for _, cd := range cc.dopts.copts.PerRPCCredentials {
-			if cd.RequireTransportSecurity() {
-				return nil, errTransportCredentialsMissing
-			}
-		}
+	if err := cc.validateTransportCredentials(); err != nil {
+		return nil, err
 	}
 
 	if cc.dopts.defaultServiceConfigRawJSON != nil {
@@ -234,35 +229,19 @@ func DialContext(ctx context.Context, target string, opts ...DialOption) (conn *
 		}
 	}()
 
-	scSet := false
-	if cc.dopts.scChan != nil {
-		// Try to get an initial service config.
-		select {
-		case sc, ok := <-cc.dopts.scChan:
-			if ok {
-				cc.sc = &sc
-				cc.safeConfigSelector.UpdateConfigSelector(&defaultConfigSelector{&sc})
-				scSet = true
-			}
-		default:
-		}
-	}
 	if cc.dopts.bs == nil {
 		cc.dopts.bs = backoff.DefaultExponential
 	}
 
 	// Determine the resolver to use.
-	resolverBuilder, err := cc.parseTargetAndFindResolver()
-	if err != nil {
+	if err := cc.parseTargetAndFindResolver(); err != nil {
 		return nil, err
 	}
-	cc.authority, err = determineAuthority(cc.parsedTarget.Endpoint, cc.target, cc.dopts)
-	if err != nil {
+	if err = cc.determineAuthority(); err != nil {
 		return nil, err
 	}
-	channelz.Infof(logger, cc.channelzID, "Channel authority set to %q", cc.authority)
 
-	if cc.dopts.scChan != nil && !scSet {
+	if cc.dopts.scChan != nil {
 		// Blocking wait for the initial service config.
 		select {
 		case sc, ok := <-cc.dopts.scChan:
@@ -278,57 +257,224 @@ func DialContext(ctx context.Context, target string, opts ...DialOption) (conn *
 		go cc.scWatcher()
 	}
 
+	// This creates the name resolver, load balancer, blocking picker etc.
+	if err := cc.exitIdleMode(); err != nil {
+		return nil, err
+	}
+
+	// Configure idleness support with configured idle timeout or default idle
+	// timeout duration. Idleness can be explicitly disabled by the user, by
+	// setting the dial option to 0.
+	cc.idlenessMgr = newIdlenessManager(cc, cc.dopts.idleTimeout)
+
+	// Return early for non-blocking dials.
+	if !cc.dopts.block {
+		return cc, nil
+	}
+
+	// A blocking dial blocks until the clientConn is ready.
+	for {
+		s := cc.GetState()
+		if s == connectivity.Idle {
+			cc.Connect()
+		}
+		if s == connectivity.Ready {
+			return cc, nil
+		} else if cc.dopts.copts.FailOnNonTempDialError && s == connectivity.TransientFailure {
+			if err = cc.connectionError(); err != nil {
+				terr, ok := err.(interface {
+					Temporary() bool
+				})
+				if ok && !terr.Temporary() {
+					return nil, err
+				}
+			}
+		}
+		if !cc.WaitForStateChange(ctx, s) {
+			// ctx got timeout or canceled.
+			if err = cc.connectionError(); err != nil && cc.dopts.returnLastError {
+				return nil, err
+			}
+			return nil, ctx.Err()
+		}
+	}
+}
+
+// addTraceEvent is a helper method to add a trace event on the channel. If the
+// channel is a nested one, the same event is also added on the parent channel.
+func (cc *ClientConn) addTraceEvent(msg string) {
+	ted := &channelz.TraceEventDesc{
+		Desc:     fmt.Sprintf("Channel %s", msg),
+		Severity: channelz.CtInfo,
+	}
+	if cc.dopts.channelzParentID != nil {
+		ted.Parent = &channelz.TraceEventDesc{
+			Desc:     fmt.Sprintf("Nested channel(id:%d) %s", cc.channelzID.Int(), msg),
+			Severity: channelz.CtInfo,
+		}
+	}
+	channelz.AddTraceEvent(logger, cc.channelzID, 0, ted)
+}
+
+// exitIdleMode moves the channel out of idle mode by recreating the name
+// resolver and load balancer.
+func (cc *ClientConn) exitIdleMode() error {
+	cc.mu.Lock()
+	if cc.conns == nil {
+		cc.mu.Unlock()
+		return errConnClosing
+	}
+	if cc.idlenessState != ccIdlenessStateIdle {
+		cc.mu.Unlock()
+		logger.Info("ClientConn asked to exit idle mode when not in idle mode")
+		return nil
+	}
+
+	defer func() {
+		// When Close() and exitIdleMode() race against each other, one of the
+		// following two can happen:
+		// - Close() wins the race and runs first. exitIdleMode() runs after, and
+		//   sees that the ClientConn is already closed and hence returns early.
+		// - exitIdleMode() wins the race and runs first and recreates the balancer
+		//   and releases the lock before recreating the resolver. If Close() runs
+		//   in this window, it will wait for exitIdleMode to complete.
+		//
+		// We achieve this synchronization using the below condition variable.
+		cc.mu.Lock()
+		cc.idlenessState = ccIdlenessStateActive
+		cc.exitIdleCond.Signal()
+		cc.mu.Unlock()
+	}()
+
+	cc.idlenessState = ccIdlenessStateExitingIdle
+	exitedIdle := false
+	if cc.blockingpicker == nil {
+		cc.blockingpicker = newPickerWrapper()
+	} else {
+		cc.blockingpicker.exitIdleMode()
+		exitedIdle = true
+	}
+
 	var credsClone credentials.TransportCredentials
 	if creds := cc.dopts.copts.TransportCredentials; creds != nil {
 		credsClone = creds.Clone()
 	}
-	cc.balancerWrapper = newCCBalancerWrapper(cc, balancer.BuildOptions{
-		DialCreds:        credsClone,
-		CredsBundle:      cc.dopts.copts.CredsBundle,
-		Dialer:           cc.dopts.copts.Dialer,
-		Authority:        cc.authority,
-		CustomUserAgent:  cc.dopts.copts.UserAgent,
-		ChannelzParentID: cc.channelzID,
-		Target:           cc.parsedTarget,
-	})
+	if cc.balancerWrapper == nil {
+		cc.balancerWrapper = newCCBalancerWrapper(cc, balancer.BuildOptions{
+			DialCreds:        credsClone,
+			CredsBundle:      cc.dopts.copts.CredsBundle,
+			Dialer:           cc.dopts.copts.Dialer,
+			Authority:        cc.authority,
+			CustomUserAgent:  cc.dopts.copts.UserAgent,
+			ChannelzParentID: cc.channelzID,
+			Target:           cc.parsedTarget,
+		})
+	} else {
+		cc.balancerWrapper.exitIdleMode()
+	}
+	cc.firstResolveEvent = grpcsync.NewEvent()
+	cc.mu.Unlock()
 
-	// Build the resolver.
-	rWrapper, err := newCCResolverWrapper(cc, resolverBuilder)
-	if err != nil {
-		return nil, fmt.Errorf("failed to build resolver: %v", err)
+	// This needs to be called without cc.mu because this builds a new resolver
+	// which might update state or report error inline which needs to be handled
+	// by cc.updateResolverState() which also grabs cc.mu.
+	if err := cc.initResolverWrapper(credsClone); err != nil {
+		return err
 	}
+
+	if exitedIdle {
+		cc.addTraceEvent("exiting idle mode")
+	}
+	return nil
+}
+
+// enterIdleMode puts the channel in idle mode, and as part of it shuts down the
+// name resolver, load balancer and any subchannels.
+func (cc *ClientConn) enterIdleMode() error {
 	cc.mu.Lock()
-	cc.resolverWrapper = rWrapper
+	if cc.conns == nil {
+		cc.mu.Unlock()
+		return ErrClientConnClosing
+	}
+	if cc.idlenessState != ccIdlenessStateActive {
+		logger.Error("ClientConn asked to enter idle mode when not active")
+		return nil
+	}
+
+	// cc.conns == nil is a proxy for the ClientConn being closed. So, instead
+	// of setting it to nil here, we recreate the map. This also means that we
+	// don't have to do this when exiting idle mode.
+	conns := cc.conns
+	cc.conns = make(map[*addrConn]struct{})
+
+	// TODO: Currently, we close the resolver wrapper upon entering idle mode
+	// and create a new one upon exiting idle mode. This means that the
+	// `cc.resolverWrapper` field would be overwritten everytime we exit idle
+	// mode. While this means that we need to hold `cc.mu` when accessing
+	// `cc.resolverWrapper`, it makes the code simpler in the wrapper. We should
+	// try to do the same for the balancer and picker wrappers too.
+	cc.resolverWrapper.close()
+	cc.blockingpicker.enterIdleMode()
+	cc.balancerWrapper.enterIdleMode()
+	cc.csMgr.updateState(connectivity.Idle)
+	cc.idlenessState = ccIdlenessStateIdle
 	cc.mu.Unlock()
 
-	// A blocking dial blocks until the clientConn is ready.
-	if cc.dopts.block {
-		for {
-			cc.Connect()
-			s := cc.GetState()
-			if s == connectivity.Ready {
-				break
-			} else if cc.dopts.copts.FailOnNonTempDialError && s == connectivity.TransientFailure {
-				if err = cc.connectionError(); err != nil {
-					terr, ok := err.(interface {
-						Temporary() bool
-					})
-					if ok && !terr.Temporary() {
-						return nil, err
-					}
-				}
-			}
-			if !cc.WaitForStateChange(ctx, s) {
-				// ctx got timeout or canceled.
-				if err = cc.connectionError(); err != nil && cc.dopts.returnLastError {
-					return nil, err
-				}
-				return nil, ctx.Err()
+	go func() {
+		cc.addTraceEvent("entering idle mode")
+		for ac := range conns {
+			ac.tearDown(errConnIdling)
+		}
+	}()
+	return nil
+}
+
+// validateTransportCredentials performs a series of checks on the configured
+// transport credentials. It returns a non-nil error if any of these conditions
+// are met:
+//   - no transport creds and no creds bundle is configured
+//   - both transport creds and creds bundle are configured
+//   - creds bundle is configured, but it lacks a transport credentials
+//   - insecure transport creds configured alongside call creds that require
+//     transport level security
+//
+// If none of the above conditions are met, the configured credentials are
+// deemed valid and a nil error is returned.
+func (cc *ClientConn) validateTransportCredentials() error {
+	if cc.dopts.copts.TransportCredentials == nil && cc.dopts.copts.CredsBundle == nil {
+		return errNoTransportSecurity
+	}
+	if cc.dopts.copts.TransportCredentials != nil && cc.dopts.copts.CredsBundle != nil {
+		return errTransportCredsAndBundle
+	}
+	if cc.dopts.copts.CredsBundle != nil && cc.dopts.copts.CredsBundle.TransportCredentials() == nil {
+		return errNoTransportCredsInBundle
+	}
+	transportCreds := cc.dopts.copts.TransportCredentials
+	if transportCreds == nil {
+		transportCreds = cc.dopts.copts.CredsBundle.TransportCredentials()
+	}
+	if transportCreds.Info().SecurityProtocol == "insecure" {
+		for _, cd := range cc.dopts.copts.PerRPCCredentials {
+			if cd.RequireTransportSecurity() {
+				return errTransportCredentialsMissing
 			}
 		}
 	}
+	return nil
+}
 
-	return cc, nil
+// channelzRegistration registers the newly created ClientConn with channelz and
+// stores the returned identifier in `cc.channelzID` and `cc.csMgr.channelzID`.
+// A channelz trace event is emitted for ClientConn creation. If the newly
+// created ClientConn is a nested one, i.e a valid parent ClientConn ID is
+// specified via a dial option, the trace event is also added to the parent.
+//
+// Doesn't grab cc.mu as this method is expected to be called only at Dial time.
+func (cc *ClientConn) channelzRegistration(target string) {
+	cc.channelzID = channelz.RegisterChannel(&channelzChannel{cc}, cc.dopts.channelzParentID, target)
+	cc.addTraceEvent("created")
+	cc.csMgr.channelzID = cc.channelzID
 }
 
 // chainUnaryClientInterceptors chains all unary client interceptors into one.
@@ -474,7 +620,9 @@ type ClientConn struct {
 	authority       string               // See determineAuthority().
 	dopts           dialOptions          // Default and user specified dial options.
 	channelzID      *channelz.Identifier // Channelz identifier for the channel.
+	resolverBuilder resolver.Builder     // See parseTargetAndFindResolver().
 	balancerWrapper *ccBalancerWrapper   // Uses gracefulswitch.balancer underneath.
+	idlenessMgr     idlenessManager
 
 	// The following provide their own synchronization, and therefore don't
 	// require cc.mu to be held to access them.
@@ -495,15 +643,35 @@ type ClientConn struct {
 	sc              *ServiceConfig             // Latest service config received from the resolver.
 	conns           map[*addrConn]struct{}     // Set to nil on close.
 	mkp             keepalive.ClientParameters // May be updated upon receipt of a GoAway.
+	idlenessState   ccIdlenessState            // Tracks idleness state of the channel.
+	exitIdleCond    *sync.Cond                 // Signalled when channel exits idle.
 
 	lceMu               sync.Mutex // protects lastConnectionError
 	lastConnectionError error
 }
 
+// ccIdlenessState tracks the idleness state of the channel.
+//
+// Channels start off in `active` and move to `idle` after a period of
+// inactivity. When moving back to `active` upon an incoming RPC, they
+// transition through `exiting_idle`. This state is useful for synchronization
+// with Close().
+//
+// This state tracking is mostly for self-protection. The idlenessManager is
+// expected to keep track of the state as well, and is expected not to call into
+// the ClientConn unnecessarily.
+type ccIdlenessState int8
+
+const (
+	ccIdlenessStateActive ccIdlenessState = iota
+	ccIdlenessStateIdle
+	ccIdlenessStateExitingIdle
+)
+
 // WaitForStateChange waits until the connectivity.State of ClientConn changes from sourceState or
 // ctx expires. A true value is returned in former case and false in latter.
 //
-// Experimental
+// # Experimental
 //
 // Notice: This API is EXPERIMENTAL and may be changed or removed in a
 // later release.
@@ -522,7 +690,7 @@ func (cc *ClientConn) WaitForStateChange(ctx context.Context, sourceState connec
 
 // GetState returns the connectivity.State of ClientConn.
 //
-// Experimental
+// # Experimental
 //
 // Notice: This API is EXPERIMENTAL and may be changed or removed in a later
 // release.
@@ -534,12 +702,15 @@ func (cc *ClientConn) GetState() connectivity.State {
 // the channel is idle.  Does not wait for the connection attempts to begin
 // before returning.
 //
-// Experimental
+// # Experimental
 //
 // Notice: This API is EXPERIMENTAL and may be changed or removed in a later
 // release.
 func (cc *ClientConn) Connect() {
-	cc.balancerWrapper.exitIdle()
+	cc.exitIdleMode()
+	// If the ClientConn was not in idle mode, we need to call ExitIdle on the
+	// LB policy so that connections can be created.
+	cc.balancerWrapper.exitIdleMode()
 }
 
 func (cc *ClientConn) scWatcher() {
@@ -708,6 +879,7 @@ func (cc *ClientConn) newAddrConn(addrs []resolver.Address, opts balancer.NewSub
 		dopts:        cc.dopts,
 		czData:       new(channelzData),
 		resetBackoff: make(chan struct{}),
+		stateChan:    make(chan struct{}),
 	}
 	ac.ctx, ac.cancel = context.WithCancel(cc.ctx)
 	// Track ac in cc. This needs to be done before any getTransport(...) is called.
@@ -761,7 +933,7 @@ func (cc *ClientConn) channelzMetric() *channelz.ChannelInternalMetric {
 
 // Target returns the target string of the ClientConn.
 //
-// Experimental
+// # Experimental
 //
 // Notice: This API is EXPERIMENTAL and may be changed or removed in a
 // later release.
@@ -788,16 +960,19 @@ func (cc *ClientConn) incrCallsFailed() {
 func (ac *addrConn) connect() error {
 	ac.mu.Lock()
 	if ac.state == connectivity.Shutdown {
+		if logger.V(2) {
+			logger.Infof("connect called on shutdown addrConn; ignoring.")
+		}
 		ac.mu.Unlock()
 		return errConnClosing
 	}
 	if ac.state != connectivity.Idle {
+		if logger.V(2) {
+			logger.Infof("connect called on addrConn in non-idle state (%v); ignoring.", ac.state)
+		}
 		ac.mu.Unlock()
 		return nil
 	}
-	// Update connectivity state within the lock to prevent subsequent or
-	// concurrent calls from resetting the transport more than once.
-	ac.updateConnectivityState(connectivity.Connecting, nil)
 	ac.mu.Unlock()
 
 	ac.resetTransport()
@@ -816,58 +991,62 @@ func equalAddresses(a, b []resolver.Address) bool {
 	return true
 }
 
-// tryUpdateAddrs tries to update ac.addrs with the new addresses list.
-//
-// If ac is TransientFailure, it updates ac.addrs and returns true. The updated
-// addresses will be picked up by retry in the next iteration after backoff.
-//
-// If ac is Shutdown or Idle, it updates ac.addrs and returns true.
-//
-// If the addresses is the same as the old list, it does nothing and returns
-// true.
-//
-// If ac is Connecting, it returns false. The caller should tear down the ac and
-// create a new one. Note that the backoff will be reset when this happens.
-//
-// If ac is Ready, it checks whether current connected address of ac is in the
-// new addrs list.
-//  - If true, it updates ac.addrs and returns true. The ac will keep using
-//    the existing connection.
-//  - If false, it does nothing and returns false.
-func (ac *addrConn) tryUpdateAddrs(addrs []resolver.Address) bool {
+// updateAddrs updates ac.addrs with the new addresses list and handles active
+// connections or connection attempts.
+func (ac *addrConn) updateAddrs(addrs []resolver.Address) {
 	ac.mu.Lock()
-	defer ac.mu.Unlock()
-	channelz.Infof(logger, ac.channelzID, "addrConn: tryUpdateAddrs curAddr: %v, addrs: %v", ac.curAddr, addrs)
+	channelz.Infof(logger, ac.channelzID, "addrConn: updateAddrs curAddr: %v, addrs: %v", ac.curAddr, addrs)
+
+	if equalAddresses(ac.addrs, addrs) {
+		ac.mu.Unlock()
+		return
+	}
+
+	ac.addrs = addrs
+
 	if ac.state == connectivity.Shutdown ||
 		ac.state == connectivity.TransientFailure ||
 		ac.state == connectivity.Idle {
-		ac.addrs = addrs
-		return true
+		// We were not connecting, so do nothing but update the addresses.
+		ac.mu.Unlock()
+		return
 	}
 
-	if equalAddresses(ac.addrs, addrs) {
-		return true
+	if ac.state == connectivity.Ready {
+		// Try to find the connected address.
+		for _, a := range addrs {
+			a.ServerName = ac.cc.getServerName(a)
+			if a.Equal(ac.curAddr) {
+				// We are connected to a valid address, so do nothing but
+				// update the addresses.
+				ac.mu.Unlock()
+				return
+			}
+		}
 	}
 
-	if ac.state == connectivity.Connecting {
-		return false
-	}
+	// We are either connected to the wrong address or currently connecting.
+	// Stop the current iteration and restart.
 
-	// ac.state is Ready, try to find the connected address.
-	var curAddrFound bool
-	for _, a := range addrs {
-		a.ServerName = ac.cc.getServerName(a)
-		if reflect.DeepEqual(ac.curAddr, a) {
-			curAddrFound = true
-			break
-		}
+	ac.cancel()
+	ac.ctx, ac.cancel = context.WithCancel(ac.cc.ctx)
+
+	// We have to defer here because GracefulClose => Close => onClose, which
+	// requires locking ac.mu.
+	if ac.transport != nil {
+		defer ac.transport.GracefulClose()
+		ac.transport = nil
 	}
-	channelz.Infof(logger, ac.channelzID, "addrConn: tryUpdateAddrs curAddrFound: %v", curAddrFound)
-	if curAddrFound {
-		ac.addrs = addrs
+
+	if len(addrs) == 0 {
+		ac.updateConnectivityState(connectivity.Idle, nil)
 	}
 
-	return curAddrFound
+	ac.mu.Unlock()
+
+	// Since we were connecting/connected, we should start a new connection
+	// attempt.
+	go ac.resetTransport()
 }
 
 // getServerName determines the serverName to be used in the connection
@@ -928,7 +1107,7 @@ func (cc *ClientConn) healthCheckConfig() *healthCheckConfig {
 	return cc.sc.healthCheckConfig
 }
 
-func (cc *ClientConn) getTransport(ctx context.Context, failfast bool, method string) (transport.ClientTransport, func(balancer.DoneInfo), error) {
+func (cc *ClientConn) getTransport(ctx context.Context, failfast bool, method string) (transport.ClientTransport, balancer.PickResult, error) {
 	return cc.blockingpicker.pick(ctx, failfast, balancer.PickInfo{
 		Ctx:            ctx,
 		FullMethodName: method,
@@ -998,7 +1177,7 @@ func (cc *ClientConn) resolveNow(o resolver.ResolveNowOptions) {
 // However, if a previously unavailable network becomes available, this may be
 // used to trigger an immediate reconnect.
 //
-// Experimental
+// # Experimental
 //
 // Notice: This API is EXPERIMENTAL and may be changed or removed in a
 // later release.
@@ -1020,39 +1199,40 @@ func (cc *ClientConn) Close() error {
 		cc.mu.Unlock()
 		return ErrClientConnClosing
 	}
+
+	for cc.idlenessState == ccIdlenessStateExitingIdle {
+		cc.exitIdleCond.Wait()
+	}
+
 	conns := cc.conns
 	cc.conns = nil
 	cc.csMgr.updateState(connectivity.Shutdown)
 
+	pWrapper := cc.blockingpicker
 	rWrapper := cc.resolverWrapper
-	cc.resolverWrapper = nil
 	bWrapper := cc.balancerWrapper
+	idlenessMgr := cc.idlenessMgr
 	cc.mu.Unlock()
 
 	// The order of closing matters here since the balancer wrapper assumes the
 	// picker is closed before it is closed.
-	cc.blockingpicker.close()
+	if pWrapper != nil {
+		pWrapper.close()
+	}
 	if bWrapper != nil {
 		bWrapper.close()
 	}
 	if rWrapper != nil {
 		rWrapper.close()
 	}
+	if idlenessMgr != nil {
+		idlenessMgr.close()
+	}
 
 	for ac := range conns {
 		ac.tearDown(ErrClientConnClosing)
 	}
-	ted := &channelz.TraceEventDesc{
-		Desc:     "Channel deleted",
-		Severity: channelz.CtInfo,
-	}
-	if cc.dopts.channelzParentID != nil {
-		ted.Parent = &channelz.TraceEventDesc{
-			Desc:     fmt.Sprintf("Nested channel(id:%d) deleted", cc.channelzID.Int()),
-			Severity: channelz.CtInfo,
-		}
-	}
-	channelz.AddTraceEvent(logger, cc.channelzID, 0, ted)
+	cc.addTraceEvent("deleted")
 	// TraceEvent needs to be called before RemoveEntry, as TraceEvent may add
 	// trace reference to the entity being deleted, and thus prevent it from being
 	// deleted right away.
@@ -1082,7 +1262,8 @@ type addrConn struct {
 	addrs   []resolver.Address // All addresses that the resolver resolved to.
 
 	// Use updateConnectivityState for updating addrConn's connectivity state.
-	state connectivity.State
+	state     connectivity.State
+	stateChan chan struct{} // closed and recreated on every state change.
 
 	backoffIdx   int // Needs to be stateful for resetConnectBackoff.
 	resetBackoff chan struct{}
@@ -1096,8 +1277,15 @@ func (ac *addrConn) updateConnectivityState(s connectivity.State, lastErr error)
 	if ac.state == s {
 		return
 	}
+	// When changing states, reset the state change channel.
+	close(ac.stateChan)
+	ac.stateChan = make(chan struct{})
 	ac.state = s
-	channelz.Infof(logger, ac.channelzID, "Subchannel Connectivity change to %v", s)
+	if lastErr == nil {
+		channelz.Infof(logger, ac.channelzID, "Subchannel Connectivity change to %v", s)
+	} else {
+		channelz.Infof(logger, ac.channelzID, "Subchannel Connectivity change to %v, last error: %s", s, lastErr)
+	}
 	ac.cc.handleSubConnStateChange(ac.acbw, s, lastErr)
 }
 
@@ -1117,7 +1305,8 @@ func (ac *addrConn) adjustParams(r transport.GoAwayReason) {
 
 func (ac *addrConn) resetTransport() {
 	ac.mu.Lock()
-	if ac.state == connectivity.Shutdown {
+	acCtx := ac.ctx
+	if acCtx.Err() != nil {
 		ac.mu.Unlock()
 		return
 	}
@@ -1145,15 +1334,14 @@ func (ac *addrConn) resetTransport() {
 	ac.updateConnectivityState(connectivity.Connecting, nil)
 	ac.mu.Unlock()
 
-	if err := ac.tryAllAddrs(addrs, connectDeadline); err != nil {
+	if err := ac.tryAllAddrs(acCtx, addrs, connectDeadline); err != nil {
 		ac.cc.resolveNow(resolver.ResolveNowOptions{})
 		// After exhausting all addresses, the addrConn enters
 		// TRANSIENT_FAILURE.
-		ac.mu.Lock()
-		if ac.state == connectivity.Shutdown {
-			ac.mu.Unlock()
+		if acCtx.Err() != nil {
 			return
 		}
+		ac.mu.Lock()
 		ac.updateConnectivityState(connectivity.TransientFailure, err)
 
 		// Backoff.
@@ -1168,13 +1356,13 @@ func (ac *addrConn) resetTransport() {
 			ac.mu.Unlock()
 		case <-b:
 			timer.Stop()
-		case <-ac.ctx.Done():
+		case <-acCtx.Done():
 			timer.Stop()
 			return
 		}
 
 		ac.mu.Lock()
-		if ac.state != connectivity.Shutdown {
+		if acCtx.Err() == nil {
 			ac.updateConnectivityState(connectivity.Idle, err)
 		}
 		ac.mu.Unlock()
@@ -1189,14 +1377,13 @@ func (ac *addrConn) resetTransport() {
 // tryAllAddrs tries to creates a connection to the addresses, and stop when at
 // the first successful one. It returns an error if no address was successfully
 // connected, or updates ac appropriately with the new transport.
-func (ac *addrConn) tryAllAddrs(addrs []resolver.Address, connectDeadline time.Time) error {
+func (ac *addrConn) tryAllAddrs(ctx context.Context, addrs []resolver.Address, connectDeadline time.Time) error {
 	var firstConnErr error
 	for _, addr := range addrs {
-		ac.mu.Lock()
-		if ac.state == connectivity.Shutdown {
-			ac.mu.Unlock()
+		if ctx.Err() != nil {
 			return errConnClosing
 		}
+		ac.mu.Lock()
 
 		ac.cc.mu.RLock()
 		ac.dopts.copts.KeepaliveParams = ac.cc.mkp
@@ -1210,7 +1397,7 @@ func (ac *addrConn) tryAllAddrs(addrs []resolver.Address, connectDeadline time.T
 
 		channelz.Infof(logger, ac.channelzID, "Subchannel picks a new address %q to connect", addr.Addr)
 
-		err := ac.createTransport(addr, copts, connectDeadline)
+		err := ac.createTransport(ctx, addr, copts, connectDeadline)
 		if err == nil {
 			return nil
 		}
@@ -1227,112 +1414,84 @@ func (ac *addrConn) tryAllAddrs(addrs []resolver.Address, connectDeadline time.T
 // createTransport creates a connection to addr. It returns an error if the
 // address was not successfully connected, or updates ac appropriately with the
 // new transport.
-func (ac *addrConn) createTransport(addr resolver.Address, copts transport.ConnectOptions, connectDeadline time.Time) error {
-	// TODO: Delete prefaceReceived and move the logic to wait for it into the
-	// transport.
-	prefaceReceived := grpcsync.NewEvent()
-	connClosed := grpcsync.NewEvent()
-
+func (ac *addrConn) createTransport(ctx context.Context, addr resolver.Address, copts transport.ConnectOptions, connectDeadline time.Time) error {
 	addr.ServerName = ac.cc.getServerName(addr)
-	hctx, hcancel := context.WithCancel(ac.ctx)
-	hcStarted := false // protected by ac.mu
+	hctx, hcancel := context.WithCancel(ctx)
 
-	onClose := func() {
+	onClose := func(r transport.GoAwayReason) {
 		ac.mu.Lock()
 		defer ac.mu.Unlock()
-		defer connClosed.Fire()
-		defer hcancel()
-		if !hcStarted || hctx.Err() != nil {
-			// We didn't start the health check or set the state to READY, so
-			// no need to do anything else here.
-			//
-			// OR, we have already cancelled the health check context, meaning
-			// we have already called onClose once for this transport.  In this
-			// case it would be dangerous to clear the transport and update the
-			// state, since there may be a new transport in this addrConn.
+		// adjust params based on GoAwayReason
+		ac.adjustParams(r)
+		if ctx.Err() != nil {
+			// Already shut down or connection attempt canceled.  tearDown() or
+			// updateAddrs() already cleared the transport and canceled hctx
+			// via ac.ctx, and we expected this connection to be closed, so do
+			// nothing here.
+			return
+		}
+		hcancel()
+		if ac.transport == nil {
+			// We're still connecting to this address, which could error.  Do
+			// not update the connectivity state or resolve; these will happen
+			// at the end of the tryAllAddrs connection loop in the event of an
+			// error.
 			return
 		}
 		ac.transport = nil
-		// Refresh the name resolver
+		// Refresh the name resolver on any connection loss.
 		ac.cc.resolveNow(resolver.ResolveNowOptions{})
-		if ac.state != connectivity.Shutdown {
-			ac.updateConnectivityState(connectivity.Idle, nil)
-		}
+		// Always go idle and wait for the LB policy to initiate a new
+		// connection attempt.
+		ac.updateConnectivityState(connectivity.Idle, nil)
 	}
 
-	onGoAway := func(r transport.GoAwayReason) {
-		ac.mu.Lock()
-		ac.adjustParams(r)
-		ac.mu.Unlock()
-		onClose()
-	}
-
-	connectCtx, cancel := context.WithDeadline(ac.ctx, connectDeadline)
+	connectCtx, cancel := context.WithDeadline(ctx, connectDeadline)
 	defer cancel()
 	copts.ChannelzParentID = ac.channelzID
 
-	newTr, err := transport.NewClientTransport(connectCtx, ac.cc.ctx, addr, copts, func() { prefaceReceived.Fire() }, onGoAway, onClose)
+	newTr, err := transport.NewClientTransport(connectCtx, ac.cc.ctx, addr, copts, onClose)
 	if err != nil {
+		if logger.V(2) {
+			logger.Infof("Creating new client transport to %q: %v", addr, err)
+		}
 		// newTr is either nil, or closed.
 		hcancel()
 		channelz.Warningf(logger, ac.channelzID, "grpc: addrConn.createTransport failed to connect to %s. Err: %v", addr, err)
 		return err
 	}
 
-	select {
-	case <-connectCtx.Done():
-		// We didn't get the preface in time.
+	ac.mu.Lock()
+	defer ac.mu.Unlock()
+	if ctx.Err() != nil {
+		// This can happen if the subConn was removed while in `Connecting`
+		// state. tearDown() would have set the state to `Shutdown`, but
+		// would not have closed the transport since ac.transport would not
+		// have been set at that point.
+		//
+		// We run this in a goroutine because newTr.Close() calls onClose()
+		// inline, which requires locking ac.mu.
+		//
 		// The error we pass to Close() is immaterial since there are no open
 		// streams at this point, so no trailers with error details will be sent
 		// out. We just need to pass a non-nil error.
-		newTr.Close(transport.ErrConnClosing)
-		if connectCtx.Err() == context.DeadlineExceeded {
-			err := errors.New("failed to receive server preface within timeout")
-			channelz.Warningf(logger, ac.channelzID, "grpc: addrConn.createTransport failed to connect to %s: %v", addr, err)
-			return err
-		}
+		//
+		// This can also happen when updateAddrs is called during a connection
+		// attempt.
+		go newTr.Close(transport.ErrConnClosing)
 		return nil
-	case <-prefaceReceived.Done():
-		// We got the preface - huzzah! things are good.
-		ac.mu.Lock()
-		defer ac.mu.Unlock()
-		if connClosed.HasFired() {
-			// onClose called first; go idle but do nothing else.
-			if ac.state != connectivity.Shutdown {
-				ac.updateConnectivityState(connectivity.Idle, nil)
-			}
-			return nil
-		}
-		if ac.state == connectivity.Shutdown {
-			// This can happen if the subConn was removed while in `Connecting`
-			// state. tearDown() would have set the state to `Shutdown`, but
-			// would not have closed the transport since ac.transport would not
-			// been set at that point.
-			//
-			// We run this in a goroutine because newTr.Close() calls onClose()
-			// inline, which requires locking ac.mu.
-			//
-			// The error we pass to Close() is immaterial since there are no open
-			// streams at this point, so no trailers with error details will be sent
-			// out. We just need to pass a non-nil error.
-			go newTr.Close(transport.ErrConnClosing)
-			return nil
-		}
-		ac.curAddr = addr
-		ac.transport = newTr
-		hcStarted = true
-		ac.startHealthCheck(hctx) // Will set state to READY if appropriate.
+	}
+	if hctx.Err() != nil {
+		// onClose was already called for this connection, but the connection
+		// was successfully established first.  Consider it a success and set
+		// the new state to Idle.
+		ac.updateConnectivityState(connectivity.Idle, nil)
 		return nil
-	case <-connClosed.Done():
-		// The transport has already closed.  If we received the preface, too,
-		// this is not an error.
-		select {
-		case <-prefaceReceived.Done():
-			return nil
-		default:
-			return errors.New("connection closed before server preface received")
-		}
 	}
+	ac.curAddr = addr
+	ac.transport = newTr
+	ac.startHealthCheck(hctx) // Will set state to READY if appropriate.
+	return nil
 }
 
 // startHealthCheck starts the health checking stream (RPC) to watch the health
@@ -1402,7 +1561,7 @@ func (ac *addrConn) startHealthCheck(ctx context.Context) {
 			if status.Code(err) == codes.Unimplemented {
 				channelz.Error(logger, ac.channelzID, "Subchannel health check is unimplemented at server side, thus health check is disabled")
 			} else {
-				channelz.Errorf(logger, ac.channelzID, "HealthCheckFunc exits with unexpected error %v", err)
+				channelz.Errorf(logger, ac.channelzID, "Health checking failed: %v", err)
 			}
 		}
 	}()
@@ -1426,6 +1585,29 @@ func (ac *addrConn) getReadyTransport() transport.ClientTransport {
 	return nil
 }
 
+// getTransport waits until the addrconn is ready and returns the transport.
+// If the context expires first, returns an appropriate status.  If the
+// addrConn is stopped first, returns an Unavailable status error.
+func (ac *addrConn) getTransport(ctx context.Context) (transport.ClientTransport, error) {
+	for ctx.Err() == nil {
+		ac.mu.Lock()
+		t, state, sc := ac.transport, ac.state, ac.stateChan
+		ac.mu.Unlock()
+		if state == connectivity.Ready {
+			return t, nil
+		}
+		if state == connectivity.Shutdown {
+			return nil, status.Errorf(codes.Unavailable, "SubConn shutting down")
+		}
+
+		select {
+		case <-ctx.Done():
+		case <-sc:
+		}
+	}
+	return nil, status.FromContextError(ctx.Err()).Err()
+}
+
 // tearDown starts to tear down the addrConn.
 //
 // Note that tearDown doesn't remove ac from ac.cc.conns, so the addrConn struct
@@ -1553,6 +1735,9 @@ func (c *channelzChannel) ChannelzMetric() *channelz.ChannelInternalMetric {
 // referenced by users.
 var ErrClientConnTimeout = errors.New("grpc: timed out when dialing")
 
+// getResolver finds the scheme in the cc's resolvers or the global registry.
+// scheme should always be lowercase (typically by virtue of url.Parse()
+// performing proper RFC3986 behavior).
 func (cc *ClientConn) getResolver(scheme string) resolver.Builder {
 	for _, rb := range cc.dopts.resolvers {
 		if scheme == rb.Scheme() {
@@ -1574,7 +1759,14 @@ func (cc *ClientConn) connectionError() error {
 	return cc.lastConnectionError
 }
 
-func (cc *ClientConn) parseTargetAndFindResolver() (resolver.Builder, error) {
+// parseTargetAndFindResolver parses the user's dial target and stores the
+// parsed target in `cc.parsedTarget`.
+//
+// The resolver to use is determined based on the scheme in the parsed target
+// and the same is stored in `cc.resolverBuilder`.
+//
+// Doesn't grab cc.mu as this method is expected to be called only at Dial time.
+func (cc *ClientConn) parseTargetAndFindResolver() error {
 	channelz.Infof(logger, cc.channelzID, "original dial target is: %q", cc.target)
 
 	var rb resolver.Builder
@@ -1583,10 +1775,11 @@ func (cc *ClientConn) parseTargetAndFindResolver() (resolver.Builder, error) {
 		channelz.Infof(logger, cc.channelzID, "dial target %q parse failed: %v", cc.target, err)
 	} else {
 		channelz.Infof(logger, cc.channelzID, "parsed dial target is: %+v", parsedTarget)
-		rb = cc.getResolver(parsedTarget.Scheme)
+		rb = cc.getResolver(parsedTarget.URL.Scheme)
 		if rb != nil {
 			cc.parsedTarget = parsedTarget
-			return rb, nil
+			cc.resolverBuilder = rb
+			return nil
 		}
 	}
 
@@ -1601,42 +1794,30 @@ func (cc *ClientConn) parseTargetAndFindResolver() (resolver.Builder, error) {
 	parsedTarget, err = parseTarget(canonicalTarget)
 	if err != nil {
 		channelz.Infof(logger, cc.channelzID, "dial target %q parse failed: %v", canonicalTarget, err)
-		return nil, err
+		return err
 	}
 	channelz.Infof(logger, cc.channelzID, "parsed dial target is: %+v", parsedTarget)
-	rb = cc.getResolver(parsedTarget.Scheme)
+	rb = cc.getResolver(parsedTarget.URL.Scheme)
 	if rb == nil {
-		return nil, fmt.Errorf("could not get resolver for default scheme: %q", parsedTarget.Scheme)
+		return fmt.Errorf("could not get resolver for default scheme: %q", parsedTarget.URL.Scheme)
 	}
 	cc.parsedTarget = parsedTarget
-	return rb, nil
+	cc.resolverBuilder = rb
+	return nil
 }
 
 // parseTarget uses RFC 3986 semantics to parse the given target into a
-// resolver.Target struct containing scheme, authority and endpoint. Query
+// resolver.Target struct containing scheme, authority and url. Query
 // params are stripped from the endpoint.
 func parseTarget(target string) (resolver.Target, error) {
 	u, err := url.Parse(target)
 	if err != nil {
 		return resolver.Target{}, err
 	}
-	// For targets of the form "[scheme]://[authority]/endpoint, the endpoint
-	// value returned from url.Parse() contains a leading "/". Although this is
-	// in accordance with RFC 3986, we do not want to break existing resolver
-	// implementations which expect the endpoint without the leading "/". So, we
-	// end up stripping the leading "/" here. But this will result in an
-	// incorrect parsing for something like "unix:///path/to/socket". Since we
-	// own the "unix" resolver, we can workaround in the unix resolver by using
-	// the `URL` field instead of the `Endpoint` field.
-	endpoint := u.Path
-	if endpoint == "" {
-		endpoint = u.Opaque
-	}
-	endpoint = strings.TrimPrefix(endpoint, "/")
+
 	return resolver.Target{
 		Scheme:    u.Scheme,
 		Authority: u.Host,
-		Endpoint:  endpoint,
 		URL:       *u,
 	}, nil
 }
@@ -1645,7 +1826,15 @@ func parseTarget(target string) (resolver.Target, error) {
 // - user specified authority override using `WithAuthority` dial option
 // - creds' notion of server name for the authentication handshake
 // - endpoint from dial target of the form "scheme://[authority]/endpoint"
-func determineAuthority(endpoint, target string, dopts dialOptions) (string, error) {
+//
+// Stores the determined authority in `cc.authority`.
+//
+// Returns a non-nil error if the authority returned by the transport
+// credentials do not match the authority configured through the dial option.
+//
+// Doesn't grab cc.mu as this method is expected to be called only at Dial time.
+func (cc *ClientConn) determineAuthority() error {
+	dopts := cc.dopts
 	// Historically, we had two options for users to specify the serverName or
 	// authority for a channel. One was through the transport credentials
 	// (either in its constructor, or through the OverrideServerName() method).
@@ -1662,25 +1851,58 @@ func determineAuthority(endpoint, target string, dopts dialOptions) (string, err
 	}
 	authorityFromDialOption := dopts.authority
 	if (authorityFromCreds != "" && authorityFromDialOption != "") && authorityFromCreds != authorityFromDialOption {
-		return "", fmt.Errorf("ClientConn's authority from transport creds %q and dial option %q don't match", authorityFromCreds, authorityFromDialOption)
+		return fmt.Errorf("ClientConn's authority from transport creds %q and dial option %q don't match", authorityFromCreds, authorityFromDialOption)
 	}
 
+	endpoint := cc.parsedTarget.Endpoint()
+	target := cc.target
 	switch {
 	case authorityFromDialOption != "":
-		return authorityFromDialOption, nil
+		cc.authority = authorityFromDialOption
 	case authorityFromCreds != "":
-		return authorityFromCreds, nil
+		cc.authority = authorityFromCreds
 	case strings.HasPrefix(target, "unix:") || strings.HasPrefix(target, "unix-abstract:"):
 		// TODO: remove when the unix resolver implements optional interface to
 		// return channel authority.
-		return "localhost", nil
+		cc.authority = "localhost"
 	case strings.HasPrefix(endpoint, ":"):
-		return "localhost" + endpoint, nil
+		cc.authority = "localhost" + endpoint
 	default:
 		// TODO: Define an optional interface on the resolver builder to return
 		// the channel authority given the user's dial target. For resolvers
 		// which don't implement this interface, we will use the endpoint from
 		// "scheme://authority/endpoint" as the default authority.
-		return endpoint, nil
+		cc.authority = endpoint
 	}
+	channelz.Infof(logger, cc.channelzID, "Channel authority set to %q", cc.authority)
+	return nil
+}
+
+// initResolverWrapper creates a ccResolverWrapper, which builds the name
+// resolver. This method grabs the lock to assign the newly built resolver
+// wrapper to the cc.resolverWrapper field.
+func (cc *ClientConn) initResolverWrapper(creds credentials.TransportCredentials) error {
+	rw, err := newCCResolverWrapper(cc, ccResolverWrapperOpts{
+		target:  cc.parsedTarget,
+		builder: cc.resolverBuilder,
+		bOpts: resolver.BuildOptions{
+			DisableServiceConfig: cc.dopts.disableServiceConfig,
+			DialCreds:            creds,
+			CredsBundle:          cc.dopts.copts.CredsBundle,
+			Dialer:               cc.dopts.copts.Dialer,
+		},
+		channelzID: cc.channelzID,
+	})
+	if err != nil {
+		return fmt.Errorf("failed to build resolver: %v", err)
+	}
+	// Resolver implementations may report state update or error inline when
+	// built (or right after), and this is handled in cc.updateResolverState.
+	// Also, an error from the resolver might lead to a re-resolution request
+	// from the balancer, which is handled in resolveNow() where
+	// `cc.resolverWrapper` is accessed. Hence, we need to hold the lock here.
+	cc.mu.Lock()
+	cc.resolverWrapper = rw
+	cc.mu.Unlock()
+	return nil
 }
diff --git a/vendor/google.golang.org/grpc/codes/code_string.go b/vendor/google.golang.org/grpc/codes/code_string.go
index 0b206a578..934fac2b0 100644
--- a/vendor/google.golang.org/grpc/codes/code_string.go
+++ b/vendor/google.golang.org/grpc/codes/code_string.go
@@ -18,7 +18,15 @@
 
 package codes
 
-import "strconv"
+import (
+	"strconv"
+
+	"google.golang.org/grpc/internal"
+)
+
+func init() {
+	internal.CanonicalString = canonicalString
+}
 
 func (c Code) String() string {
 	switch c {
@@ -60,3 +68,44 @@ func (c Code) String() string {
 		return "Code(" + strconv.FormatInt(int64(c), 10) + ")"
 	}
 }
+
+func canonicalString(c Code) string {
+	switch c {
+	case OK:
+		return "OK"
+	case Canceled:
+		return "CANCELLED"
+	case Unknown:
+		return "UNKNOWN"
+	case InvalidArgument:
+		return "INVALID_ARGUMENT"
+	case DeadlineExceeded:
+		return "DEADLINE_EXCEEDED"
+	case NotFound:
+		return "NOT_FOUND"
+	case AlreadyExists:
+		return "ALREADY_EXISTS"
+	case PermissionDenied:
+		return "PERMISSION_DENIED"
+	case ResourceExhausted:
+		return "RESOURCE_EXHAUSTED"
+	case FailedPrecondition:
+		return "FAILED_PRECONDITION"
+	case Aborted:
+		return "ABORTED"
+	case OutOfRange:
+		return "OUT_OF_RANGE"
+	case Unimplemented:
+		return "UNIMPLEMENTED"
+	case Internal:
+		return "INTERNAL"
+	case Unavailable:
+		return "UNAVAILABLE"
+	case DataLoss:
+		return "DATA_LOSS"
+	case Unauthenticated:
+		return "UNAUTHENTICATED"
+	default:
+		return "CODE(" + strconv.FormatInt(int64(c), 10) + ")"
+	}
+}
diff --git a/vendor/google.golang.org/grpc/credentials/credentials.go b/vendor/google.golang.org/grpc/credentials/credentials.go
index 96ff1877e..5feac3aa0 100644
--- a/vendor/google.golang.org/grpc/credentials/credentials.go
+++ b/vendor/google.golang.org/grpc/credentials/credentials.go
@@ -36,16 +36,16 @@ import (
 // PerRPCCredentials defines the common interface for the credentials which need to
 // attach security information to every RPC (e.g., oauth2).
 type PerRPCCredentials interface {
-	// GetRequestMetadata gets the current request metadata, refreshing
-	// tokens if required. This should be called by the transport layer on
-	// each request, and the data should be populated in headers or other
-	// context. If a status code is returned, it will be used as the status
-	// for the RPC. uri is the URI of the entry point for the request.
-	// When supported by the underlying implementation, ctx can be used for
-	// timeout and cancellation. Additionally, RequestInfo data will be
-	// available via ctx to this call.
-	// TODO(zhaoq): Define the set of the qualified keys instead of leaving
-	// it as an arbitrary string.
+	// GetRequestMetadata gets the current request metadata, refreshing tokens
+	// if required. This should be called by the transport layer on each
+	// request, and the data should be populated in headers or other
+	// context. If a status code is returned, it will be used as the status for
+	// the RPC (restricted to an allowable set of codes as defined by gRFC
+	// A54). uri is the URI of the entry point for the request.  When supported
+	// by the underlying implementation, ctx can be used for timeout and
+	// cancellation. Additionally, RequestInfo data will be available via ctx
+	// to this call.  TODO(zhaoq): Define the set of the qualified keys instead
+	// of leaving it as an arbitrary string.
 	GetRequestMetadata(ctx context.Context, uri ...string) (map[string]string, error)
 	// RequireTransportSecurity indicates whether the credentials requires
 	// transport security.
diff --git a/vendor/google.golang.org/grpc/credentials/tls.go b/vendor/google.golang.org/grpc/credentials/tls.go
index 784822d05..877b7cd21 100644
--- a/vendor/google.golang.org/grpc/credentials/tls.go
+++ b/vendor/google.golang.org/grpc/credentials/tls.go
@@ -23,9 +23,9 @@ import (
 	"crypto/tls"
 	"crypto/x509"
 	"fmt"
-	"io/ioutil"
 	"net"
 	"net/url"
+	"os"
 
 	credinternal "google.golang.org/grpc/internal/credentials"
 )
@@ -166,7 +166,7 @@ func NewClientTLSFromCert(cp *x509.CertPool, serverNameOverride string) Transpor
 // it will override the virtual host name of authority (e.g. :authority header
 // field) in requests.
 func NewClientTLSFromFile(certFile, serverNameOverride string) (TransportCredentials, error) {
-	b, err := ioutil.ReadFile(certFile)
+	b, err := os.ReadFile(certFile)
 	if err != nil {
 		return nil, err
 	}
@@ -195,7 +195,7 @@ func NewServerTLSFromFile(certFile, keyFile string) (TransportCredentials, error
 // TLSChannelzSecurityValue defines the struct that TLS protocol should return
 // from GetSecurityValue(), containing security info like cipher and certificate used.
 //
-// Experimental
+// # Experimental
 //
 // Notice: This type is EXPERIMENTAL and may be changed or removed in a
 // later release.
diff --git a/vendor/google.golang.org/grpc/dialoptions.go b/vendor/google.golang.org/grpc/dialoptions.go
index 60403bc16..15a3d5102 100644
--- a/vendor/google.golang.org/grpc/dialoptions.go
+++ b/vendor/google.golang.org/grpc/dialoptions.go
@@ -29,6 +29,7 @@ import (
 	"google.golang.org/grpc/credentials/insecure"
 	"google.golang.org/grpc/internal"
 	internalbackoff "google.golang.org/grpc/internal/backoff"
+	"google.golang.org/grpc/internal/binarylog"
 	"google.golang.org/grpc/internal/transport"
 	"google.golang.org/grpc/keepalive"
 	"google.golang.org/grpc/resolver"
@@ -36,12 +37,15 @@ import (
 )
 
 func init() {
-	internal.AddExtraDialOptions = func(opt ...DialOption) {
-		extraDialOptions = append(extraDialOptions, opt...)
+	internal.AddGlobalDialOptions = func(opt ...DialOption) {
+		globalDialOptions = append(globalDialOptions, opt...)
 	}
-	internal.ClearExtraDialOptions = func() {
-		extraDialOptions = nil
+	internal.ClearGlobalDialOptions = func() {
+		globalDialOptions = nil
 	}
+	internal.WithBinaryLogger = withBinaryLogger
+	internal.JoinDialOptions = newJoinDialOption
+	internal.DisableGlobalDialOptions = newDisableGlobalDialOptions
 }
 
 // dialOptions configure a Dial call. dialOptions are set by the DialOption
@@ -61,6 +65,7 @@ type dialOptions struct {
 	timeout                     time.Duration
 	scChan                      <-chan ServiceConfig
 	authority                   string
+	binaryLogger                binarylog.Logger
 	copts                       transport.ConnectOptions
 	callOptions                 []CallOption
 	channelzParentID            *channelz.Identifier
@@ -72,6 +77,7 @@ type dialOptions struct {
 	defaultServiceConfig        *ServiceConfig // defaultServiceConfig is parsed from defaultServiceConfigRawJSON.
 	defaultServiceConfigRawJSON *string
 	resolvers                   []resolver.Builder
+	idleTimeout                 time.Duration
 }
 
 // DialOption configures how we set up the connection.
@@ -79,7 +85,7 @@ type DialOption interface {
 	apply(*dialOptions)
 }
 
-var extraDialOptions []DialOption
+var globalDialOptions []DialOption
 
 // EmptyDialOption does not alter the dial configuration. It can be embedded in
 // another structure to build custom dial options.
@@ -92,6 +98,16 @@ type EmptyDialOption struct{}
 
 func (EmptyDialOption) apply(*dialOptions) {}
 
+type disableGlobalDialOptions struct{}
+
+func (disableGlobalDialOptions) apply(*dialOptions) {}
+
+// newDisableGlobalDialOptions returns a DialOption that prevents the ClientConn
+// from applying the global DialOptions (set via AddGlobalDialOptions).
+func newDisableGlobalDialOptions() DialOption {
+	return &disableGlobalDialOptions{}
+}
+
 // funcDialOption wraps a function that modifies dialOptions into an
 // implementation of the DialOption interface.
 type funcDialOption struct {
@@ -108,13 +124,28 @@ func newFuncDialOption(f func(*dialOptions)) *funcDialOption {
 	}
 }
 
+type joinDialOption struct {
+	opts []DialOption
+}
+
+func (jdo *joinDialOption) apply(do *dialOptions) {
+	for _, opt := range jdo.opts {
+		opt.apply(do)
+	}
+}
+
+func newJoinDialOption(opts ...DialOption) DialOption {
+	return &joinDialOption{opts: opts}
+}
+
 // WithWriteBufferSize determines how much data can be batched before doing a
 // write on the wire. The corresponding memory allocation for this buffer will
 // be twice the size to keep syscalls low. The default value for this buffer is
 // 32KB.
 //
-// Zero will disable the write buffer such that each write will be on underlying
-// connection. Note: A Send call may not directly translate to a write.
+// Zero or negative values will disable the write buffer such that each write
+// will be on underlying connection. Note: A Send call may not directly
+// translate to a write.
 func WithWriteBufferSize(s int) DialOption {
 	return newFuncDialOption(func(o *dialOptions) {
 		o.copts.WriteBufferSize = s
@@ -124,8 +155,9 @@ func WithWriteBufferSize(s int) DialOption {
 // WithReadBufferSize lets you set the size of read buffer, this determines how
 // much data can be read at most for each read syscall.
 //
-// The default value for this buffer is 32KB. Zero will disable read buffer for
-// a connection so data framer can access the underlying conn directly.
+// The default value for this buffer is 32KB. Zero or negative values will
+// disable read buffer for a connection so data framer can access the
+// underlying conn directly.
 func WithReadBufferSize(s int) DialOption {
 	return newFuncDialOption(func(o *dialOptions) {
 		o.copts.ReadBufferSize = s
@@ -264,6 +296,9 @@ func withBackoff(bs internalbackoff.Strategy) DialOption {
 // WithBlock returns a DialOption which makes callers of Dial block until the
 // underlying connection is up. Without this, Dial returns immediately and
 // connecting the server happens in background.
+//
+// Use of this feature is not recommended.  For more information, please see:
+// https://github.com/grpc/grpc-go/blob/master/Documentation/anti-patterns.md
 func WithBlock() DialOption {
 	return newFuncDialOption(func(o *dialOptions) {
 		o.block = true
@@ -275,6 +310,9 @@ func WithBlock() DialOption {
 // the context.DeadlineExceeded error.
 // Implies WithBlock()
 //
+// Use of this feature is not recommended.  For more information, please see:
+// https://github.com/grpc/grpc-go/blob/master/Documentation/anti-patterns.md
+//
 // # Experimental
 //
 // Notice: This API is EXPERIMENTAL and may be changed or removed in a
@@ -401,6 +439,14 @@ func WithStatsHandler(h stats.Handler) DialOption {
 	})
 }
 
+// withBinaryLogger returns a DialOption that specifies the binary logger for
+// this ClientConn.
+func withBinaryLogger(bl binarylog.Logger) DialOption {
+	return newFuncDialOption(func(o *dialOptions) {
+		o.binaryLogger = bl
+	})
+}
+
 // FailOnNonTempDialError returns a DialOption that specifies if gRPC fails on
 // non-temporary dial errors. If f is true, and dialer returns a non-temporary
 // error, gRPC will fail the connection to the network address and won't try to
@@ -409,6 +455,9 @@ func WithStatsHandler(h stats.Handler) DialOption {
 // FailOnNonTempDialError only affects the initial dial, and does not do
 // anything useful unless you are also using WithBlock().
 //
+// Use of this feature is not recommended.  For more information, please see:
+// https://github.com/grpc/grpc-go/blob/master/Documentation/anti-patterns.md
+//
 // # Experimental
 //
 // Notice: This API is EXPERIMENTAL and may be changed or removed in a
@@ -607,3 +656,23 @@ func WithResolvers(rs ...resolver.Builder) DialOption {
 		o.resolvers = append(o.resolvers, rs...)
 	})
 }
+
+// WithIdleTimeout returns a DialOption that configures an idle timeout for the
+// channel. If the channel is idle for the configured timeout, i.e there are no
+// ongoing RPCs and no new RPCs are initiated, the channel will enter idle mode
+// and as a result the name resolver and load balancer will be shut down. The
+// channel will exit idle mode when the Connect() method is called or when an
+// RPC is initiated.
+//
+// By default this feature is disabled, which can also be explicitly configured
+// by passing zero to this function.
+//
+// # Experimental
+//
+// Notice: This API is EXPERIMENTAL and may be changed or removed in a
+// later release.
+func WithIdleTimeout(d time.Duration) DialOption {
+	return newFuncDialOption(func(o *dialOptions) {
+		o.idleTimeout = d
+	})
+}
diff --git a/vendor/google.golang.org/grpc/encoding/encoding.go b/vendor/google.golang.org/grpc/encoding/encoding.go
index 18e530fc9..07a586135 100644
--- a/vendor/google.golang.org/grpc/encoding/encoding.go
+++ b/vendor/google.golang.org/grpc/encoding/encoding.go
@@ -19,7 +19,7 @@
 // Package encoding defines the interface for the compressor and codec, and
 // functions to register and retrieve compressors and codecs.
 //
-// Experimental
+// # Experimental
 //
 // Notice: This package is EXPERIMENTAL and may be changed or removed in a
 // later release.
@@ -28,6 +28,8 @@ package encoding
 import (
 	"io"
 	"strings"
+
+	"google.golang.org/grpc/internal/grpcutil"
 )
 
 // Identity specifies the optional encoding for uncompressed streams.
@@ -73,6 +75,9 @@ var registeredCompressor = make(map[string]Compressor)
 // registered with the same name, the one registered last will take effect.
 func RegisterCompressor(c Compressor) {
 	registeredCompressor[c.Name()] = c
+	if !grpcutil.IsCompressorNameRegistered(c.Name()) {
+		grpcutil.RegisteredCompressorNames = append(grpcutil.RegisteredCompressorNames, c.Name())
+	}
 }
 
 // GetCompressor returns Compressor for the given compressor name.
diff --git a/vendor/google.golang.org/grpc/grpclog/loggerv2.go b/vendor/google.golang.org/grpc/grpclog/loggerv2.go
index 7c1f66409..5de66e40d 100644
--- a/vendor/google.golang.org/grpc/grpclog/loggerv2.go
+++ b/vendor/google.golang.org/grpc/grpclog/loggerv2.go
@@ -22,7 +22,6 @@ import (
 	"encoding/json"
 	"fmt"
 	"io"
-	"io/ioutil"
 	"log"
 	"os"
 	"strconv"
@@ -140,9 +139,9 @@ func newLoggerV2WithConfig(infoW, warningW, errorW io.Writer, c loggerV2Config)
 // newLoggerV2 creates a loggerV2 to be used as default logger.
 // All logs are written to stderr.
 func newLoggerV2() LoggerV2 {
-	errorW := ioutil.Discard
-	warningW := ioutil.Discard
-	infoW := ioutil.Discard
+	errorW := io.Discard
+	warningW := io.Discard
+	infoW := io.Discard
 
 	logLevel := os.Getenv("GRPC_GO_LOG_SEVERITY_LEVEL")
 	switch logLevel {
@@ -242,7 +241,7 @@ func (g *loggerT) V(l int) bool {
 // DepthLoggerV2, the below functions will be called with the appropriate stack
 // depth set for trivial functions the logger may ignore.
 //
-// Experimental
+// # Experimental
 //
 // Notice: This type is EXPERIMENTAL and may be changed or removed in a
 // later release.
diff --git a/vendor/google.golang.org/grpc/idle.go b/vendor/google.golang.org/grpc/idle.go
new file mode 100644
index 000000000..dc3dc72f6
--- /dev/null
+++ b/vendor/google.golang.org/grpc/idle.go
@@ -0,0 +1,287 @@
+/*
+ *
+ * Copyright 2023 gRPC authors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ *
+ */
+
+package grpc
+
+import (
+	"fmt"
+	"math"
+	"sync"
+	"sync/atomic"
+	"time"
+)
+
+// For overriding in unit tests.
+var timeAfterFunc = func(d time.Duration, f func()) *time.Timer {
+	return time.AfterFunc(d, f)
+}
+
+// idlenessEnforcer is the functionality provided by grpc.ClientConn to enter
+// and exit from idle mode.
+type idlenessEnforcer interface {
+	exitIdleMode() error
+	enterIdleMode() error
+}
+
+// idlenessManager defines the functionality required to track RPC activity on a
+// channel.
+type idlenessManager interface {
+	onCallBegin() error
+	onCallEnd()
+	close()
+}
+
+type noopIdlenessManager struct{}
+
+func (noopIdlenessManager) onCallBegin() error { return nil }
+func (noopIdlenessManager) onCallEnd()         {}
+func (noopIdlenessManager) close()             {}
+
+// idlenessManagerImpl implements the idlenessManager interface. It uses atomic
+// operations to synchronize access to shared state and a mutex to guarantee
+// mutual exclusion in a critical section.
+type idlenessManagerImpl struct {
+	// State accessed atomically.
+	lastCallEndTime           int64 // Unix timestamp in nanos; time when the most recent RPC completed.
+	activeCallsCount          int32 // Count of active RPCs; -math.MaxInt32 means channel is idle or is trying to get there.
+	activeSinceLastTimerCheck int32 // Boolean; True if there was an RPC since the last timer callback.
+	closed                    int32 // Boolean; True when the manager is closed.
+
+	// Can be accessed without atomics or mutex since these are set at creation
+	// time and read-only after that.
+	enforcer idlenessEnforcer // Functionality provided by grpc.ClientConn.
+	timeout  int64            // Idle timeout duration nanos stored as an int64.
+
+	// idleMu is used to guarantee mutual exclusion in two scenarios:
+	// - Opposing intentions:
+	//   - a: Idle timeout has fired and handleIdleTimeout() is trying to put
+	//     the channel in idle mode because the channel has been inactive.
+	//   - b: At the same time an RPC is made on the channel, and onCallBegin()
+	//     is trying to prevent the channel from going idle.
+	// - Competing intentions:
+	//   - The channel is in idle mode and there are multiple RPCs starting at
+	//     the same time, all trying to move the channel out of idle. Only one
+	//     of them should succeed in doing so, while the other RPCs should
+	//     piggyback on the first one and be successfully handled.
+	idleMu       sync.RWMutex
+	actuallyIdle bool
+	timer        *time.Timer
+}
+
+// newIdlenessManager creates a new idleness manager implementation for the
+// given idle timeout.
+func newIdlenessManager(enforcer idlenessEnforcer, idleTimeout time.Duration) idlenessManager {
+	if idleTimeout == 0 {
+		return noopIdlenessManager{}
+	}
+
+	i := &idlenessManagerImpl{
+		enforcer: enforcer,
+		timeout:  int64(idleTimeout),
+	}
+	i.timer = timeAfterFunc(idleTimeout, i.handleIdleTimeout)
+	return i
+}
+
+// resetIdleTimer resets the idle timer to the given duration. This method
+// should only be called from the timer callback.
+func (i *idlenessManagerImpl) resetIdleTimer(d time.Duration) {
+	i.idleMu.Lock()
+	defer i.idleMu.Unlock()
+
+	if i.timer == nil {
+		// Only close sets timer to nil. We are done.
+		return
+	}
+
+	// It is safe to ignore the return value from Reset() because this method is
+	// only ever called from the timer callback, which means the timer has
+	// already fired.
+	i.timer.Reset(d)
+}
+
+// handleIdleTimeout is the timer callback that is invoked upon expiry of the
+// configured idle timeout. The channel is considered inactive if there are no
+// ongoing calls and no RPC activity since the last time the timer fired.
+func (i *idlenessManagerImpl) handleIdleTimeout() {
+	if i.isClosed() {
+		return
+	}
+
+	if atomic.LoadInt32(&i.activeCallsCount) > 0 {
+		i.resetIdleTimer(time.Duration(i.timeout))
+		return
+	}
+
+	// There has been activity on the channel since we last got here. Reset the
+	// timer and return.
+	if atomic.LoadInt32(&i.activeSinceLastTimerCheck) == 1 {
+		// Set the timer to fire after a duration of idle timeout, calculated
+		// from the time the most recent RPC completed.
+		atomic.StoreInt32(&i.activeSinceLastTimerCheck, 0)
+		i.resetIdleTimer(time.Duration(atomic.LoadInt64(&i.lastCallEndTime) + i.timeout - time.Now().UnixNano()))
+		return
+	}
+
+	// This CAS operation is extremely likely to succeed given that there has
+	// been no activity since the last time we were here.  Setting the
+	// activeCallsCount to -math.MaxInt32 indicates to onCallBegin() that the
+	// channel is either in idle mode or is trying to get there.
+	if !atomic.CompareAndSwapInt32(&i.activeCallsCount, 0, -math.MaxInt32) {
+		// This CAS operation can fail if an RPC started after we checked for
+		// activity at the top of this method, or one was ongoing from before
+		// the last time we were here. In both case, reset the timer and return.
+		i.resetIdleTimer(time.Duration(i.timeout))
+		return
+	}
+
+	// Now that we've set the active calls count to -math.MaxInt32, it's time to
+	// actually move to idle mode.
+	if i.tryEnterIdleMode() {
+		// Successfully entered idle mode. No timer needed until we exit idle.
+		return
+	}
+
+	// Failed to enter idle mode due to a concurrent RPC that kept the channel
+	// active, or because of an error from the channel. Undo the attempt to
+	// enter idle, and reset the timer to try again later.
+	atomic.AddInt32(&i.activeCallsCount, math.MaxInt32)
+	i.resetIdleTimer(time.Duration(i.timeout))
+}
+
+// tryEnterIdleMode instructs the channel to enter idle mode. But before
+// that, it performs a last minute check to ensure that no new RPC has come in,
+// making the channel active.
+//
+// Return value indicates whether or not the channel moved to idle mode.
+//
+// Holds idleMu which ensures mutual exclusion with exitIdleMode.
+func (i *idlenessManagerImpl) tryEnterIdleMode() bool {
+	i.idleMu.Lock()
+	defer i.idleMu.Unlock()
+
+	if atomic.LoadInt32(&i.activeCallsCount) != -math.MaxInt32 {
+		// We raced and lost to a new RPC. Very rare, but stop entering idle.
+		return false
+	}
+	if atomic.LoadInt32(&i.activeSinceLastTimerCheck) == 1 {
+		// An very short RPC could have come in (and also finished) after we
+		// checked for calls count and activity in handleIdleTimeout(), but
+		// before the CAS operation. So, we need to check for activity again.
+		return false
+	}
+
+	// No new RPCs have come in since we last set the active calls count value
+	// -math.MaxInt32 in the timer callback. And since we have the lock, it is
+	// safe to enter idle mode now.
+	if err := i.enforcer.enterIdleMode(); err != nil {
+		logger.Errorf("Failed to enter idle mode: %v", err)
+		return false
+	}
+
+	// Successfully entered idle mode.
+	i.actuallyIdle = true
+	return true
+}
+
+// onCallBegin is invoked at the start of every RPC.
+func (i *idlenessManagerImpl) onCallBegin() error {
+	if i.isClosed() {
+		return nil
+	}
+
+	if atomic.AddInt32(&i.activeCallsCount, 1) > 0 {
+		// Channel is not idle now. Set the activity bit and allow the call.
+		atomic.StoreInt32(&i.activeSinceLastTimerCheck, 1)
+		return nil
+	}
+
+	// Channel is either in idle mode or is in the process of moving to idle
+	// mode. Attempt to exit idle mode to allow this RPC.
+	if err := i.exitIdleMode(); err != nil {
+		// Undo the increment to calls count, and return an error causing the
+		// RPC to fail.
+		atomic.AddInt32(&i.activeCallsCount, -1)
+		return err
+	}
+
+	atomic.StoreInt32(&i.activeSinceLastTimerCheck, 1)
+	return nil
+}
+
+// exitIdleMode instructs the channel to exit idle mode.
+//
+// Holds idleMu which ensures mutual exclusion with tryEnterIdleMode.
+func (i *idlenessManagerImpl) exitIdleMode() error {
+	i.idleMu.Lock()
+	defer i.idleMu.Unlock()
+
+	if !i.actuallyIdle {
+		// This can happen in two scenarios:
+		// - handleIdleTimeout() set the calls count to -math.MaxInt32 and called
+		//   tryEnterIdleMode(). But before the latter could grab the lock, an RPC
+		//   came in and onCallBegin() noticed that the calls count is negative.
+		// - Channel is in idle mode, and multiple new RPCs come in at the same
+		//   time, all of them notice a negative calls count in onCallBegin and get
+		//   here. The first one to get the lock would got the channel to exit idle.
+		//
+		// Either way, nothing to do here.
+		return nil
+	}
+
+	if err := i.enforcer.exitIdleMode(); err != nil {
+		return fmt.Errorf("channel failed to exit idle mode: %v", err)
+	}
+
+	// Undo the idle entry process. This also respects any new RPC attempts.
+	atomic.AddInt32(&i.activeCallsCount, math.MaxInt32)
+	i.actuallyIdle = false
+
+	// Start a new timer to fire after the configured idle timeout.
+	i.timer = timeAfterFunc(time.Duration(i.timeout), i.handleIdleTimeout)
+	return nil
+}
+
+// onCallEnd is invoked at the end of every RPC.
+func (i *idlenessManagerImpl) onCallEnd() {
+	if i.isClosed() {
+		return
+	}
+
+	// Record the time at which the most recent call finished.
+	atomic.StoreInt64(&i.lastCallEndTime, time.Now().UnixNano())
+
+	// Decrement the active calls count. This count can temporarily go negative
+	// when the timer callback is in the process of moving the channel to idle
+	// mode, but one or more RPCs come in and complete before the timer callback
+	// can get done with the process of moving to idle mode.
+	atomic.AddInt32(&i.activeCallsCount, -1)
+}
+
+func (i *idlenessManagerImpl) isClosed() bool {
+	return atomic.LoadInt32(&i.closed) == 1
+}
+
+func (i *idlenessManagerImpl) close() {
+	atomic.StoreInt32(&i.closed, 1)
+
+	i.idleMu.Lock()
+	i.timer.Stop()
+	i.timer = nil
+	i.idleMu.Unlock()
+}
diff --git a/vendor/google.golang.org/grpc/internal/binarylog/binarylog.go b/vendor/google.golang.org/grpc/internal/binarylog/binarylog.go
index e3dfe204f..755fdebc1 100644
--- a/vendor/google.golang.org/grpc/internal/binarylog/binarylog.go
+++ b/vendor/google.golang.org/grpc/internal/binarylog/binarylog.go
@@ -28,8 +28,13 @@ import (
 	"google.golang.org/grpc/internal/grpcutil"
 )
 
-// Logger is the global binary logger. It can be used to get binary logger for
-// each method.
+var grpclogLogger = grpclog.Component("binarylog")
+
+// Logger specifies MethodLoggers for method names with a Log call that
+// takes a context.
+//
+// This is used in the 1.0 release of gcp/observability, and thus must not be
+// deleted or changed.
 type Logger interface {
 	GetMethodLogger(methodName string) MethodLogger
 }
@@ -37,11 +42,9 @@ type Logger interface {
 // binLogger is the global binary logger for the binary. One of this should be
 // built at init time from the configuration (environment variable or flags).
 //
-// It is used to get a methodLogger for each individual method.
+// It is used to get a MethodLogger for each individual method.
 var binLogger Logger
 
-var grpclogLogger = grpclog.Component("binarylog")
-
 // SetLogger sets the binary logger.
 //
 // Only call this at init time.
@@ -56,11 +59,11 @@ func GetLogger() Logger {
 	return binLogger
 }
 
-// GetMethodLogger returns the methodLogger for the given methodName.
+// GetMethodLogger returns the MethodLogger for the given methodName.
 //
 // methodName should be in the format of "/service/method".
 //
-// Each methodLogger returned by this method is a new instance. This is to
+// Each MethodLogger returned by this method is a new instance. This is to
 // generate sequence id within the call.
 func GetMethodLogger(methodName string) MethodLogger {
 	if binLogger == nil {
@@ -117,7 +120,7 @@ func (l *logger) setDefaultMethodLogger(ml *MethodLoggerConfig) error {
 
 // Set method logger for "service/*".
 //
-// New methodLogger with same service overrides the old one.
+// New MethodLogger with same service overrides the old one.
 func (l *logger) setServiceMethodLogger(service string, ml *MethodLoggerConfig) error {
 	if _, ok := l.config.Services[service]; ok {
 		return fmt.Errorf("conflicting service rules for service %v found", service)
@@ -131,7 +134,7 @@ func (l *logger) setServiceMethodLogger(service string, ml *MethodLoggerConfig)
 
 // Set method logger for "service/method".
 //
-// New methodLogger with same method overrides the old one.
+// New MethodLogger with same method overrides the old one.
 func (l *logger) setMethodMethodLogger(method string, ml *MethodLoggerConfig) error {
 	if _, ok := l.config.Blacklist[method]; ok {
 		return fmt.Errorf("conflicting blacklist rules for method %v found", method)
@@ -161,11 +164,11 @@ func (l *logger) setBlacklist(method string) error {
 	return nil
 }
 
-// getMethodLogger returns the methodLogger for the given methodName.
+// getMethodLogger returns the MethodLogger for the given methodName.
 //
 // methodName should be in the format of "/service/method".
 //
-// Each methodLogger returned by this method is a new instance. This is to
+// Each MethodLogger returned by this method is a new instance. This is to
 // generate sequence id within the call.
 func (l *logger) GetMethodLogger(methodName string) MethodLogger {
 	s, m, err := grpcutil.ParseMethod(methodName)
@@ -174,16 +177,16 @@ func (l *logger) GetMethodLogger(methodName string) MethodLogger {
 		return nil
 	}
 	if ml, ok := l.config.Methods[s+"/"+m]; ok {
-		return newMethodLogger(ml.Header, ml.Message)
+		return NewTruncatingMethodLogger(ml.Header, ml.Message)
 	}
 	if _, ok := l.config.Blacklist[s+"/"+m]; ok {
 		return nil
 	}
 	if ml, ok := l.config.Services[s]; ok {
-		return newMethodLogger(ml.Header, ml.Message)
+		return NewTruncatingMethodLogger(ml.Header, ml.Message)
 	}
 	if l.config.All == nil {
 		return nil
 	}
-	return newMethodLogger(l.config.All.Header, l.config.All.Message)
+	return NewTruncatingMethodLogger(l.config.All.Header, l.config.All.Message)
 }
diff --git a/vendor/google.golang.org/grpc/internal/binarylog/env_config.go b/vendor/google.golang.org/grpc/internal/binarylog/env_config.go
index ab589a76b..f9e80e27a 100644
--- a/vendor/google.golang.org/grpc/internal/binarylog/env_config.go
+++ b/vendor/google.golang.org/grpc/internal/binarylog/env_config.go
@@ -30,15 +30,15 @@ import (
 // to build a new logger and assign it to binarylog.Logger.
 //
 // Example filter config strings:
-//  - "" Nothing will be logged
-//  - "*" All headers and messages will be fully logged.
-//  - "*{h}" Only headers will be logged.
-//  - "*{m:256}" Only the first 256 bytes of each message will be logged.
-//  - "Foo/*" Logs every method in service Foo
-//  - "Foo/*,-Foo/Bar" Logs every method in service Foo except method /Foo/Bar
-//  - "Foo/*,Foo/Bar{m:256}" Logs the first 256 bytes of each message in method
-//    /Foo/Bar, logs all headers and messages in every other method in service
-//    Foo.
+//   - "" Nothing will be logged
+//   - "*" All headers and messages will be fully logged.
+//   - "*{h}" Only headers will be logged.
+//   - "*{m:256}" Only the first 256 bytes of each message will be logged.
+//   - "Foo/*" Logs every method in service Foo
+//   - "Foo/*,-Foo/Bar" Logs every method in service Foo except method /Foo/Bar
+//   - "Foo/*,Foo/Bar{m:256}" Logs the first 256 bytes of each message in method
+//     /Foo/Bar, logs all headers and messages in every other method in service
+//     Foo.
 //
 // If two configs exist for one certain method or service, the one specified
 // later overrides the previous config.
@@ -57,7 +57,7 @@ func NewLoggerFromConfigString(s string) Logger {
 	return l
 }
 
-// fillMethodLoggerWithConfigString parses config, creates methodLogger and adds
+// fillMethodLoggerWithConfigString parses config, creates TruncatingMethodLogger and adds
 // it to the right map in the logger.
 func (l *logger) fillMethodLoggerWithConfigString(config string) error {
 	// "" is invalid.
diff --git a/vendor/google.golang.org/grpc/internal/binarylog/method_logger.go b/vendor/google.golang.org/grpc/internal/binarylog/method_logger.go
index 24df0a1a0..6c3f63221 100644
--- a/vendor/google.golang.org/grpc/internal/binarylog/method_logger.go
+++ b/vendor/google.golang.org/grpc/internal/binarylog/method_logger.go
@@ -19,6 +19,7 @@
 package binarylog
 
 import (
+	"context"
 	"net"
 	"strings"
 	"sync/atomic"
@@ -26,7 +27,7 @@ import (
 
 	"github.com/golang/protobuf/proto"
 	"github.com/golang/protobuf/ptypes"
-	pb "google.golang.org/grpc/binarylog/grpc_binarylog_v1"
+	binlogpb "google.golang.org/grpc/binarylog/grpc_binarylog_v1"
 	"google.golang.org/grpc/metadata"
 	"google.golang.org/grpc/status"
 )
@@ -48,11 +49,16 @@ func (g *callIDGenerator) reset() {
 var idGen callIDGenerator
 
 // MethodLogger is the sub-logger for each method.
+//
+// This is used in the 1.0 release of gcp/observability, and thus must not be
+// deleted or changed.
 type MethodLogger interface {
-	Log(LogEntryConfig)
+	Log(context.Context, LogEntryConfig)
 }
 
-type methodLogger struct {
+// TruncatingMethodLogger is a method logger that truncates headers and messages
+// based on configured fields.
+type TruncatingMethodLogger struct {
 	headerMaxLen, messageMaxLen uint64
 
 	callID          uint64
@@ -61,8 +67,12 @@ type methodLogger struct {
 	sink Sink // TODO(blog): make this plugable.
 }
 
-func newMethodLogger(h, m uint64) *methodLogger {
-	return &methodLogger{
+// NewTruncatingMethodLogger returns a new truncating method logger.
+//
+// This is used in the 1.0 release of gcp/observability, and thus must not be
+// deleted or changed.
+func NewTruncatingMethodLogger(h, m uint64) *TruncatingMethodLogger {
+	return &TruncatingMethodLogger{
 		headerMaxLen:  h,
 		messageMaxLen: m,
 
@@ -75,8 +85,8 @@ func newMethodLogger(h, m uint64) *methodLogger {
 
 // Build is an internal only method for building the proto message out of the
 // input event. It's made public to enable other library to reuse as much logic
-// in methodLogger as possible.
-func (ml *methodLogger) Build(c LogEntryConfig) *pb.GrpcLogEntry {
+// in TruncatingMethodLogger as possible.
+func (ml *TruncatingMethodLogger) Build(c LogEntryConfig) *binlogpb.GrpcLogEntry {
 	m := c.toProto()
 	timestamp, _ := ptypes.TimestampProto(time.Now())
 	m.Timestamp = timestamp
@@ -84,22 +94,22 @@ func (ml *methodLogger) Build(c LogEntryConfig) *pb.GrpcLogEntry {
 	m.SequenceIdWithinCall = ml.idWithinCallGen.next()
 
 	switch pay := m.Payload.(type) {
-	case *pb.GrpcLogEntry_ClientHeader:
+	case *binlogpb.GrpcLogEntry_ClientHeader:
 		m.PayloadTruncated = ml.truncateMetadata(pay.ClientHeader.GetMetadata())
-	case *pb.GrpcLogEntry_ServerHeader:
+	case *binlogpb.GrpcLogEntry_ServerHeader:
 		m.PayloadTruncated = ml.truncateMetadata(pay.ServerHeader.GetMetadata())
-	case *pb.GrpcLogEntry_Message:
+	case *binlogpb.GrpcLogEntry_Message:
 		m.PayloadTruncated = ml.truncateMessage(pay.Message)
 	}
 	return m
 }
 
 // Log creates a proto binary log entry, and logs it to the sink.
-func (ml *methodLogger) Log(c LogEntryConfig) {
+func (ml *TruncatingMethodLogger) Log(ctx context.Context, c LogEntryConfig) {
 	ml.sink.Write(ml.Build(c))
 }
 
-func (ml *methodLogger) truncateMetadata(mdPb *pb.Metadata) (truncated bool) {
+func (ml *TruncatingMethodLogger) truncateMetadata(mdPb *binlogpb.Metadata) (truncated bool) {
 	if ml.headerMaxLen == maxUInt {
 		return false
 	}
@@ -118,7 +128,7 @@ func (ml *methodLogger) truncateMetadata(mdPb *pb.Metadata) (truncated bool) {
 			// but not counted towards the size limit.
 			continue
 		}
-		currentEntryLen := uint64(len(entry.Value))
+		currentEntryLen := uint64(len(entry.GetKey())) + uint64(len(entry.GetValue()))
 		if currentEntryLen > bytesLimit {
 			break
 		}
@@ -129,7 +139,7 @@ func (ml *methodLogger) truncateMetadata(mdPb *pb.Metadata) (truncated bool) {
 	return truncated
 }
 
-func (ml *methodLogger) truncateMessage(msgPb *pb.Message) (truncated bool) {
+func (ml *TruncatingMethodLogger) truncateMessage(msgPb *binlogpb.Message) (truncated bool) {
 	if ml.messageMaxLen == maxUInt {
 		return false
 	}
@@ -141,8 +151,11 @@ func (ml *methodLogger) truncateMessage(msgPb *pb.Message) (truncated bool) {
 }
 
 // LogEntryConfig represents the configuration for binary log entry.
+//
+// This is used in the 1.0 release of gcp/observability, and thus must not be
+// deleted or changed.
 type LogEntryConfig interface {
-	toProto() *pb.GrpcLogEntry
+	toProto() *binlogpb.GrpcLogEntry
 }
 
 // ClientHeader configs the binary log entry to be a ClientHeader entry.
@@ -156,10 +169,10 @@ type ClientHeader struct {
 	PeerAddr net.Addr
 }
 
-func (c *ClientHeader) toProto() *pb.GrpcLogEntry {
+func (c *ClientHeader) toProto() *binlogpb.GrpcLogEntry {
 	// This function doesn't need to set all the fields (e.g. seq ID). The Log
 	// function will set the fields when necessary.
-	clientHeader := &pb.ClientHeader{
+	clientHeader := &binlogpb.ClientHeader{
 		Metadata:   mdToMetadataProto(c.Header),
 		MethodName: c.MethodName,
 		Authority:  c.Authority,
@@ -167,16 +180,16 @@ func (c *ClientHeader) toProto() *pb.GrpcLogEntry {
 	if c.Timeout > 0 {
 		clientHeader.Timeout = ptypes.DurationProto(c.Timeout)
 	}
-	ret := &pb.GrpcLogEntry{
-		Type: pb.GrpcLogEntry_EVENT_TYPE_CLIENT_HEADER,
-		Payload: &pb.GrpcLogEntry_ClientHeader{
+	ret := &binlogpb.GrpcLogEntry{
+		Type: binlogpb.GrpcLogEntry_EVENT_TYPE_CLIENT_HEADER,
+		Payload: &binlogpb.GrpcLogEntry_ClientHeader{
 			ClientHeader: clientHeader,
 		},
 	}
 	if c.OnClientSide {
-		ret.Logger = pb.GrpcLogEntry_LOGGER_CLIENT
+		ret.Logger = binlogpb.GrpcLogEntry_LOGGER_CLIENT
 	} else {
-		ret.Logger = pb.GrpcLogEntry_LOGGER_SERVER
+		ret.Logger = binlogpb.GrpcLogEntry_LOGGER_SERVER
 	}
 	if c.PeerAddr != nil {
 		ret.Peer = addrToProto(c.PeerAddr)
@@ -192,19 +205,19 @@ type ServerHeader struct {
 	PeerAddr net.Addr
 }
 
-func (c *ServerHeader) toProto() *pb.GrpcLogEntry {
-	ret := &pb.GrpcLogEntry{
-		Type: pb.GrpcLogEntry_EVENT_TYPE_SERVER_HEADER,
-		Payload: &pb.GrpcLogEntry_ServerHeader{
-			ServerHeader: &pb.ServerHeader{
+func (c *ServerHeader) toProto() *binlogpb.GrpcLogEntry {
+	ret := &binlogpb.GrpcLogEntry{
+		Type: binlogpb.GrpcLogEntry_EVENT_TYPE_SERVER_HEADER,
+		Payload: &binlogpb.GrpcLogEntry_ServerHeader{
+			ServerHeader: &binlogpb.ServerHeader{
 				Metadata: mdToMetadataProto(c.Header),
 			},
 		},
 	}
 	if c.OnClientSide {
-		ret.Logger = pb.GrpcLogEntry_LOGGER_CLIENT
+		ret.Logger = binlogpb.GrpcLogEntry_LOGGER_CLIENT
 	} else {
-		ret.Logger = pb.GrpcLogEntry_LOGGER_SERVER
+		ret.Logger = binlogpb.GrpcLogEntry_LOGGER_SERVER
 	}
 	if c.PeerAddr != nil {
 		ret.Peer = addrToProto(c.PeerAddr)
@@ -220,7 +233,7 @@ type ClientMessage struct {
 	Message interface{}
 }
 
-func (c *ClientMessage) toProto() *pb.GrpcLogEntry {
+func (c *ClientMessage) toProto() *binlogpb.GrpcLogEntry {
 	var (
 		data []byte
 		err  error
@@ -235,19 +248,19 @@ func (c *ClientMessage) toProto() *pb.GrpcLogEntry {
 	} else {
 		grpclogLogger.Infof("binarylogging: message to log is neither proto.message nor []byte")
 	}
-	ret := &pb.GrpcLogEntry{
-		Type: pb.GrpcLogEntry_EVENT_TYPE_CLIENT_MESSAGE,
-		Payload: &pb.GrpcLogEntry_Message{
-			Message: &pb.Message{
+	ret := &binlogpb.GrpcLogEntry{
+		Type: binlogpb.GrpcLogEntry_EVENT_TYPE_CLIENT_MESSAGE,
+		Payload: &binlogpb.GrpcLogEntry_Message{
+			Message: &binlogpb.Message{
 				Length: uint32(len(data)),
 				Data:   data,
 			},
 		},
 	}
 	if c.OnClientSide {
-		ret.Logger = pb.GrpcLogEntry_LOGGER_CLIENT
+		ret.Logger = binlogpb.GrpcLogEntry_LOGGER_CLIENT
 	} else {
-		ret.Logger = pb.GrpcLogEntry_LOGGER_SERVER
+		ret.Logger = binlogpb.GrpcLogEntry_LOGGER_SERVER
 	}
 	return ret
 }
@@ -260,7 +273,7 @@ type ServerMessage struct {
 	Message interface{}
 }
 
-func (c *ServerMessage) toProto() *pb.GrpcLogEntry {
+func (c *ServerMessage) toProto() *binlogpb.GrpcLogEntry {
 	var (
 		data []byte
 		err  error
@@ -275,19 +288,19 @@ func (c *ServerMessage) toProto() *pb.GrpcLogEntry {
 	} else {
 		grpclogLogger.Infof("binarylogging: message to log is neither proto.message nor []byte")
 	}
-	ret := &pb.GrpcLogEntry{
-		Type: pb.GrpcLogEntry_EVENT_TYPE_SERVER_MESSAGE,
-		Payload: &pb.GrpcLogEntry_Message{
-			Message: &pb.Message{
+	ret := &binlogpb.GrpcLogEntry{
+		Type: binlogpb.GrpcLogEntry_EVENT_TYPE_SERVER_MESSAGE,
+		Payload: &binlogpb.GrpcLogEntry_Message{
+			Message: &binlogpb.Message{
 				Length: uint32(len(data)),
 				Data:   data,
 			},
 		},
 	}
 	if c.OnClientSide {
-		ret.Logger = pb.GrpcLogEntry_LOGGER_CLIENT
+		ret.Logger = binlogpb.GrpcLogEntry_LOGGER_CLIENT
 	} else {
-		ret.Logger = pb.GrpcLogEntry_LOGGER_SERVER
+		ret.Logger = binlogpb.GrpcLogEntry_LOGGER_SERVER
 	}
 	return ret
 }
@@ -297,15 +310,15 @@ type ClientHalfClose struct {
 	OnClientSide bool
 }
 
-func (c *ClientHalfClose) toProto() *pb.GrpcLogEntry {
-	ret := &pb.GrpcLogEntry{
-		Type:    pb.GrpcLogEntry_EVENT_TYPE_CLIENT_HALF_CLOSE,
+func (c *ClientHalfClose) toProto() *binlogpb.GrpcLogEntry {
+	ret := &binlogpb.GrpcLogEntry{
+		Type:    binlogpb.GrpcLogEntry_EVENT_TYPE_CLIENT_HALF_CLOSE,
 		Payload: nil, // No payload here.
 	}
 	if c.OnClientSide {
-		ret.Logger = pb.GrpcLogEntry_LOGGER_CLIENT
+		ret.Logger = binlogpb.GrpcLogEntry_LOGGER_CLIENT
 	} else {
-		ret.Logger = pb.GrpcLogEntry_LOGGER_SERVER
+		ret.Logger = binlogpb.GrpcLogEntry_LOGGER_SERVER
 	}
 	return ret
 }
@@ -321,7 +334,7 @@ type ServerTrailer struct {
 	PeerAddr net.Addr
 }
 
-func (c *ServerTrailer) toProto() *pb.GrpcLogEntry {
+func (c *ServerTrailer) toProto() *binlogpb.GrpcLogEntry {
 	st, ok := status.FromError(c.Err)
 	if !ok {
 		grpclogLogger.Info("binarylogging: error in trailer is not a status error")
@@ -337,10 +350,10 @@ func (c *ServerTrailer) toProto() *pb.GrpcLogEntry {
 			grpclogLogger.Infof("binarylogging: failed to marshal status proto: %v", err)
 		}
 	}
-	ret := &pb.GrpcLogEntry{
-		Type: pb.GrpcLogEntry_EVENT_TYPE_SERVER_TRAILER,
-		Payload: &pb.GrpcLogEntry_Trailer{
-			Trailer: &pb.Trailer{
+	ret := &binlogpb.GrpcLogEntry{
+		Type: binlogpb.GrpcLogEntry_EVENT_TYPE_SERVER_TRAILER,
+		Payload: &binlogpb.GrpcLogEntry_Trailer{
+			Trailer: &binlogpb.Trailer{
 				Metadata:      mdToMetadataProto(c.Trailer),
 				StatusCode:    uint32(st.Code()),
 				StatusMessage: st.Message(),
@@ -349,9 +362,9 @@ func (c *ServerTrailer) toProto() *pb.GrpcLogEntry {
 		},
 	}
 	if c.OnClientSide {
-		ret.Logger = pb.GrpcLogEntry_LOGGER_CLIENT
+		ret.Logger = binlogpb.GrpcLogEntry_LOGGER_CLIENT
 	} else {
-		ret.Logger = pb.GrpcLogEntry_LOGGER_SERVER
+		ret.Logger = binlogpb.GrpcLogEntry_LOGGER_SERVER
 	}
 	if c.PeerAddr != nil {
 		ret.Peer = addrToProto(c.PeerAddr)
@@ -364,15 +377,15 @@ type Cancel struct {
 	OnClientSide bool
 }
 
-func (c *Cancel) toProto() *pb.GrpcLogEntry {
-	ret := &pb.GrpcLogEntry{
-		Type:    pb.GrpcLogEntry_EVENT_TYPE_CANCEL,
+func (c *Cancel) toProto() *binlogpb.GrpcLogEntry {
+	ret := &binlogpb.GrpcLogEntry{
+		Type:    binlogpb.GrpcLogEntry_EVENT_TYPE_CANCEL,
 		Payload: nil,
 	}
 	if c.OnClientSide {
-		ret.Logger = pb.GrpcLogEntry_LOGGER_CLIENT
+		ret.Logger = binlogpb.GrpcLogEntry_LOGGER_CLIENT
 	} else {
-		ret.Logger = pb.GrpcLogEntry_LOGGER_SERVER
+		ret.Logger = binlogpb.GrpcLogEntry_LOGGER_SERVER
 	}
 	return ret
 }
@@ -389,15 +402,15 @@ func metadataKeyOmit(key string) bool {
 	return strings.HasPrefix(key, "grpc-")
 }
 
-func mdToMetadataProto(md metadata.MD) *pb.Metadata {
-	ret := &pb.Metadata{}
+func mdToMetadataProto(md metadata.MD) *binlogpb.Metadata {
+	ret := &binlogpb.Metadata{}
 	for k, vv := range md {
 		if metadataKeyOmit(k) {
 			continue
 		}
 		for _, v := range vv {
 			ret.Entry = append(ret.Entry,
-				&pb.MetadataEntry{
+				&binlogpb.MetadataEntry{
 					Key:   k,
 					Value: []byte(v),
 				},
@@ -407,26 +420,26 @@ func mdToMetadataProto(md metadata.MD) *pb.Metadata {
 	return ret
 }
 
-func addrToProto(addr net.Addr) *pb.Address {
-	ret := &pb.Address{}
+func addrToProto(addr net.Addr) *binlogpb.Address {
+	ret := &binlogpb.Address{}
 	switch a := addr.(type) {
 	case *net.TCPAddr:
 		if a.IP.To4() != nil {
-			ret.Type = pb.Address_TYPE_IPV4
+			ret.Type = binlogpb.Address_TYPE_IPV4
 		} else if a.IP.To16() != nil {
-			ret.Type = pb.Address_TYPE_IPV6
+			ret.Type = binlogpb.Address_TYPE_IPV6
 		} else {
-			ret.Type = pb.Address_TYPE_UNKNOWN
+			ret.Type = binlogpb.Address_TYPE_UNKNOWN
 			// Do not set address and port fields.
 			break
 		}
 		ret.Address = a.IP.String()
 		ret.IpPort = uint32(a.Port)
 	case *net.UnixAddr:
-		ret.Type = pb.Address_TYPE_UNIX
+		ret.Type = binlogpb.Address_TYPE_UNIX
 		ret.Address = a.String()
 	default:
-		ret.Type = pb.Address_TYPE_UNKNOWN
+		ret.Type = binlogpb.Address_TYPE_UNKNOWN
 	}
 	return ret
 }
diff --git a/vendor/google.golang.org/grpc/internal/binarylog/sink.go b/vendor/google.golang.org/grpc/internal/binarylog/sink.go
index c2fdd58b3..264de387c 100644
--- a/vendor/google.golang.org/grpc/internal/binarylog/sink.go
+++ b/vendor/google.golang.org/grpc/internal/binarylog/sink.go
@@ -26,7 +26,7 @@ import (
 	"time"
 
 	"github.com/golang/protobuf/proto"
-	pb "google.golang.org/grpc/binarylog/grpc_binarylog_v1"
+	binlogpb "google.golang.org/grpc/binarylog/grpc_binarylog_v1"
 )
 
 var (
@@ -42,15 +42,15 @@ type Sink interface {
 	// Write will be called to write the log entry into the sink.
 	//
 	// It should be thread-safe so it can be called in parallel.
-	Write(*pb.GrpcLogEntry) error
+	Write(*binlogpb.GrpcLogEntry) error
 	// Close will be called when the Sink is replaced by a new Sink.
 	Close() error
 }
 
 type noopSink struct{}
 
-func (ns *noopSink) Write(*pb.GrpcLogEntry) error { return nil }
-func (ns *noopSink) Close() error                 { return nil }
+func (ns *noopSink) Write(*binlogpb.GrpcLogEntry) error { return nil }
+func (ns *noopSink) Close() error                       { return nil }
 
 // newWriterSink creates a binary log sink with the given writer.
 //
@@ -66,7 +66,7 @@ type writerSink struct {
 	out io.Writer
 }
 
-func (ws *writerSink) Write(e *pb.GrpcLogEntry) error {
+func (ws *writerSink) Write(e *binlogpb.GrpcLogEntry) error {
 	b, err := proto.Marshal(e)
 	if err != nil {
 		grpclogLogger.Errorf("binary logging: failed to marshal proto message: %v", err)
@@ -96,7 +96,7 @@ type bufferedSink struct {
 	done        chan struct{}
 }
 
-func (fs *bufferedSink) Write(e *pb.GrpcLogEntry) error {
+func (fs *bufferedSink) Write(e *binlogpb.GrpcLogEntry) error {
 	fs.mu.Lock()
 	defer fs.mu.Unlock()
 	if !fs.flusherStarted {
diff --git a/vendor/google.golang.org/grpc/internal/buffer/unbounded.go b/vendor/google.golang.org/grpc/internal/buffer/unbounded.go
index 9f6a0c120..81c2f5fd7 100644
--- a/vendor/google.golang.org/grpc/internal/buffer/unbounded.go
+++ b/vendor/google.golang.org/grpc/internal/buffer/unbounded.go
@@ -35,6 +35,7 @@ import "sync"
 // internal/transport/transport.go for an example of this.
 type Unbounded struct {
 	c       chan interface{}
+	closed  bool
 	mu      sync.Mutex
 	backlog []interface{}
 }
@@ -47,16 +48,18 @@ func NewUnbounded() *Unbounded {
 // Put adds t to the unbounded buffer.
 func (b *Unbounded) Put(t interface{}) {
 	b.mu.Lock()
+	defer b.mu.Unlock()
+	if b.closed {
+		return
+	}
 	if len(b.backlog) == 0 {
 		select {
 		case b.c <- t:
-			b.mu.Unlock()
 			return
 		default:
 		}
 	}
 	b.backlog = append(b.backlog, t)
-	b.mu.Unlock()
 }
 
 // Load sends the earliest buffered data, if any, onto the read channel
@@ -64,6 +67,10 @@ func (b *Unbounded) Put(t interface{}) {
 // value from the read channel.
 func (b *Unbounded) Load() {
 	b.mu.Lock()
+	defer b.mu.Unlock()
+	if b.closed {
+		return
+	}
 	if len(b.backlog) > 0 {
 		select {
 		case b.c <- b.backlog[0]:
@@ -72,7 +79,6 @@ func (b *Unbounded) Load() {
 		default:
 		}
 	}
-	b.mu.Unlock()
 }
 
 // Get returns a read channel on which values added to the buffer, via Put(),
@@ -80,6 +86,20 @@ func (b *Unbounded) Load() {
 //
 // Upon reading a value from this channel, users are expected to call Load() to
 // send the next buffered value onto the channel if there is any.
+//
+// If the unbounded buffer is closed, the read channel returned by this method
+// is closed.
 func (b *Unbounded) Get() <-chan interface{} {
 	return b.c
 }
+
+// Close closes the unbounded buffer.
+func (b *Unbounded) Close() {
+	b.mu.Lock()
+	defer b.mu.Unlock()
+	if b.closed {
+		return
+	}
+	b.closed = true
+	close(b.c)
+}
diff --git a/vendor/google.golang.org/grpc/internal/channelz/types.go b/vendor/google.golang.org/grpc/internal/channelz/types.go
index ad0ce4dab..7b2f350e2 100644
--- a/vendor/google.golang.org/grpc/internal/channelz/types.go
+++ b/vendor/google.golang.org/grpc/internal/channelz/types.go
@@ -273,10 +273,10 @@ func (c *channel) deleteSelfFromMap() (delete bool) {
 
 // deleteSelfIfReady tries to delete the channel itself from the channelz database.
 // The delete process includes two steps:
-// 1. delete the channel from the entry relation tree, i.e. delete the channel reference from its
-//    parent's child list.
-// 2. delete the channel from the map, i.e. delete the channel entirely from channelz. Lookup by id
-//    will return entry not found error.
+//  1. delete the channel from the entry relation tree, i.e. delete the channel reference from its
+//     parent's child list.
+//  2. delete the channel from the map, i.e. delete the channel entirely from channelz. Lookup by id
+//     will return entry not found error.
 func (c *channel) deleteSelfIfReady() {
 	if !c.deleteSelfFromTree() {
 		return
@@ -381,10 +381,10 @@ func (sc *subChannel) deleteSelfFromMap() (delete bool) {
 
 // deleteSelfIfReady tries to delete the subchannel itself from the channelz database.
 // The delete process includes two steps:
-// 1. delete the subchannel from the entry relation tree, i.e. delete the subchannel reference from
-//    its parent's child list.
-// 2. delete the subchannel from the map, i.e. delete the subchannel entirely from channelz. Lookup
-//    by id will return entry not found error.
+//  1. delete the subchannel from the entry relation tree, i.e. delete the subchannel reference from
+//     its parent's child list.
+//  2. delete the subchannel from the map, i.e. delete the subchannel entirely from channelz. Lookup
+//     by id will return entry not found error.
 func (sc *subChannel) deleteSelfIfReady() {
 	if !sc.deleteSelfFromTree() {
 		return
diff --git a/vendor/google.golang.org/grpc/internal/envconfig/envconfig.go b/vendor/google.golang.org/grpc/internal/envconfig/envconfig.go
index 6f0272543..80fd5c7d2 100644
--- a/vendor/google.golang.org/grpc/internal/envconfig/envconfig.go
+++ b/vendor/google.golang.org/grpc/internal/envconfig/envconfig.go
@@ -21,15 +21,46 @@ package envconfig
 
 import (
 	"os"
+	"strconv"
 	"strings"
 )
 
-const (
-	prefix          = "GRPC_GO_"
-	txtErrIgnoreStr = prefix + "IGNORE_TXT_ERRORS"
-)
-
 var (
 	// TXTErrIgnore is set if TXT errors should be ignored ("GRPC_GO_IGNORE_TXT_ERRORS" is not "false").
-	TXTErrIgnore = !strings.EqualFold(os.Getenv(txtErrIgnoreStr), "false")
+	TXTErrIgnore = boolFromEnv("GRPC_GO_IGNORE_TXT_ERRORS", true)
+	// AdvertiseCompressors is set if registered compressor should be advertised
+	// ("GRPC_GO_ADVERTISE_COMPRESSORS" is not "false").
+	AdvertiseCompressors = boolFromEnv("GRPC_GO_ADVERTISE_COMPRESSORS", true)
+	// RingHashCap indicates the maximum ring size which defaults to 4096
+	// entries but may be overridden by setting the environment variable
+	// "GRPC_RING_HASH_CAP".  This does not override the default bounds
+	// checking which NACKs configs specifying ring sizes > 8*1024*1024 (~8M).
+	RingHashCap = uint64FromEnv("GRPC_RING_HASH_CAP", 4096, 1, 8*1024*1024)
+	// PickFirstLBConfig is set if we should support configuration of the
+	// pick_first LB policy, which can be enabled by setting the environment
+	// variable "GRPC_EXPERIMENTAL_PICKFIRST_LB_CONFIG" to "true".
+	PickFirstLBConfig = boolFromEnv("GRPC_EXPERIMENTAL_PICKFIRST_LB_CONFIG", false)
 )
+
+func boolFromEnv(envVar string, def bool) bool {
+	if def {
+		// The default is true; return true unless the variable is "false".
+		return !strings.EqualFold(os.Getenv(envVar), "false")
+	}
+	// The default is false; return false unless the variable is "true".
+	return strings.EqualFold(os.Getenv(envVar), "true")
+}
+
+func uint64FromEnv(envVar string, def, min, max uint64) uint64 {
+	v, err := strconv.ParseUint(os.Getenv(envVar), 10, 64)
+	if err != nil {
+		return def
+	}
+	if v < min {
+		return min
+	}
+	if v > max {
+		return max
+	}
+	return v
+}
diff --git a/vendor/google.golang.org/grpc/internal/envconfig/observability.go b/vendor/google.golang.org/grpc/internal/envconfig/observability.go
new file mode 100644
index 000000000..dd314cfb1
--- /dev/null
+++ b/vendor/google.golang.org/grpc/internal/envconfig/observability.go
@@ -0,0 +1,42 @@
+/*
+ *
+ * Copyright 2022 gRPC authors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ *
+ */
+
+package envconfig
+
+import "os"
+
+const (
+	envObservabilityConfig     = "GRPC_GCP_OBSERVABILITY_CONFIG"
+	envObservabilityConfigFile = "GRPC_GCP_OBSERVABILITY_CONFIG_FILE"
+)
+
+var (
+	// ObservabilityConfig is the json configuration for the gcp/observability
+	// package specified directly in the envObservabilityConfig env var.
+	//
+	// This is used in the 1.0 release of gcp/observability, and thus must not be
+	// deleted or changed.
+	ObservabilityConfig = os.Getenv(envObservabilityConfig)
+	// ObservabilityConfigFile is the json configuration for the
+	// gcp/observability specified in a file with the location specified in
+	// envObservabilityConfigFile env var.
+	//
+	// This is used in the 1.0 release of gcp/observability, and thus must not be
+	// deleted or changed.
+	ObservabilityConfigFile = os.Getenv(envObservabilityConfigFile)
+)
diff --git a/vendor/google.golang.org/grpc/internal/envconfig/xds.go b/vendor/google.golang.org/grpc/internal/envconfig/xds.go
index a83b26bb8..02b4b6a1c 100644
--- a/vendor/google.golang.org/grpc/internal/envconfig/xds.go
+++ b/vendor/google.golang.org/grpc/internal/envconfig/xds.go
@@ -20,7 +20,6 @@ package envconfig
 
 import (
 	"os"
-	"strings"
 )
 
 const (
@@ -36,15 +35,6 @@ const (
 	//
 	// When both bootstrap FileName and FileContent are set, FileName is used.
 	XDSBootstrapFileContentEnv = "GRPC_XDS_BOOTSTRAP_CONFIG"
-
-	ringHashSupportEnv           = "GRPC_XDS_EXPERIMENTAL_ENABLE_RING_HASH"
-	clientSideSecuritySupportEnv = "GRPC_XDS_EXPERIMENTAL_SECURITY_SUPPORT"
-	aggregateAndDNSSupportEnv    = "GRPC_XDS_EXPERIMENTAL_ENABLE_AGGREGATE_AND_LOGICAL_DNS_CLUSTER"
-	rbacSupportEnv               = "GRPC_XDS_EXPERIMENTAL_RBAC"
-	federationEnv                = "GRPC_EXPERIMENTAL_XDS_FEDERATION"
-	rlsInXDSEnv                  = "GRPC_EXPERIMENTAL_XDS_RLS_LB"
-
-	c2pResolverTestOnlyTrafficDirectorURIEnv = "GRPC_TEST_ONLY_GOOGLE_C2P_RESOLVER_TRAFFIC_DIRECTOR_URI"
 )
 
 var (
@@ -63,38 +53,43 @@ var (
 	// XDSRingHash indicates whether ring hash support is enabled, which can be
 	// disabled by setting the environment variable
 	// "GRPC_XDS_EXPERIMENTAL_ENABLE_RING_HASH" to "false".
-	XDSRingHash = !strings.EqualFold(os.Getenv(ringHashSupportEnv), "false")
+	XDSRingHash = boolFromEnv("GRPC_XDS_EXPERIMENTAL_ENABLE_RING_HASH", true)
 	// XDSClientSideSecurity is used to control processing of security
 	// configuration on the client-side.
 	//
 	// Note that there is no env var protection for the server-side because we
 	// have a brand new API on the server-side and users explicitly need to use
 	// the new API to get security integration on the server.
-	XDSClientSideSecurity = !strings.EqualFold(os.Getenv(clientSideSecuritySupportEnv), "false")
-	// XDSAggregateAndDNS indicates whether processing of aggregated cluster
-	// and DNS cluster is enabled, which can be enabled by setting the
-	// environment variable
-	// "GRPC_XDS_EXPERIMENTAL_ENABLE_AGGREGATE_AND_LOGICAL_DNS_CLUSTER" to
-	// "true".
-	XDSAggregateAndDNS = !strings.EqualFold(os.Getenv(aggregateAndDNSSupportEnv), "false")
+	XDSClientSideSecurity = boolFromEnv("GRPC_XDS_EXPERIMENTAL_SECURITY_SUPPORT", true)
+	// XDSAggregateAndDNS indicates whether processing of aggregated cluster and
+	// DNS cluster is enabled, which can be disabled by setting the environment
+	// variable "GRPC_XDS_EXPERIMENTAL_ENABLE_AGGREGATE_AND_LOGICAL_DNS_CLUSTER"
+	// to "false".
+	XDSAggregateAndDNS = boolFromEnv("GRPC_XDS_EXPERIMENTAL_ENABLE_AGGREGATE_AND_LOGICAL_DNS_CLUSTER", true)
 
 	// XDSRBAC indicates whether xDS configured RBAC HTTP Filter is enabled,
 	// which can be disabled by setting the environment variable
 	// "GRPC_XDS_EXPERIMENTAL_RBAC" to "false".
-	XDSRBAC = !strings.EqualFold(os.Getenv(rbacSupportEnv), "false")
+	XDSRBAC = boolFromEnv("GRPC_XDS_EXPERIMENTAL_RBAC", true)
 	// XDSOutlierDetection indicates whether outlier detection support is
-	// enabled, which can be enabled by setting the environment variable
-	// "GRPC_EXPERIMENTAL_ENABLE_OUTLIER_DETECTION" to "true".
-	XDSOutlierDetection = false
-	// XDSFederation indicates whether federation support is enabled.
-	XDSFederation = strings.EqualFold(os.Getenv(federationEnv), "true")
+	// enabled, which can be disabled by setting the environment variable
+	// "GRPC_EXPERIMENTAL_ENABLE_OUTLIER_DETECTION" to "false".
+	XDSOutlierDetection = boolFromEnv("GRPC_EXPERIMENTAL_ENABLE_OUTLIER_DETECTION", true)
+	// XDSFederation indicates whether federation support is enabled, which can
+	// be enabled by setting the environment variable
+	// "GRPC_EXPERIMENTAL_XDS_FEDERATION" to "true".
+	XDSFederation = boolFromEnv("GRPC_EXPERIMENTAL_XDS_FEDERATION", true)
 
 	// XDSRLS indicates whether processing of Cluster Specifier plugins and
-	// support for the RLS CLuster Specifier is enabled, which can be enabled by
+	// support for the RLS CLuster Specifier is enabled, which can be disabled by
 	// setting the environment variable "GRPC_EXPERIMENTAL_XDS_RLS_LB" to
-	// "true".
-	XDSRLS = strings.EqualFold(os.Getenv(rlsInXDSEnv), "true")
+	// "false".
+	XDSRLS = boolFromEnv("GRPC_EXPERIMENTAL_XDS_RLS_LB", true)
 
 	// C2PResolverTestOnlyTrafficDirectorURI is the TD URI for testing.
-	C2PResolverTestOnlyTrafficDirectorURI = os.Getenv(c2pResolverTestOnlyTrafficDirectorURIEnv)
+	C2PResolverTestOnlyTrafficDirectorURI = os.Getenv("GRPC_TEST_ONLY_GOOGLE_C2P_RESOLVER_TRAFFIC_DIRECTOR_URI")
+	// XDSCustomLBPolicy indicates whether Custom LB Policies are enabled, which
+	// can be disabled by setting the environment variable
+	// "GRPC_EXPERIMENTAL_XDS_CUSTOM_LB_CONFIG" to "false".
+	XDSCustomLBPolicy = boolFromEnv("GRPC_EXPERIMENTAL_XDS_CUSTOM_LB_CONFIG", true)
 )
diff --git a/vendor/google.golang.org/grpc/internal/grpclog/grpclog.go b/vendor/google.golang.org/grpc/internal/grpclog/grpclog.go
index 30a3b4258..b68e26a36 100644
--- a/vendor/google.golang.org/grpc/internal/grpclog/grpclog.go
+++ b/vendor/google.golang.org/grpc/internal/grpclog/grpclog.go
@@ -110,7 +110,7 @@ type LoggerV2 interface {
 // This is a copy of the DepthLoggerV2 defined in the external grpclog package.
 // It is defined here to avoid a circular dependency.
 //
-// Experimental
+// # Experimental
 //
 // Notice: This type is EXPERIMENTAL and may be changed or removed in a
 // later release.
diff --git a/vendor/google.golang.org/grpc/internal/grpclog/prefixLogger.go b/vendor/google.golang.org/grpc/internal/grpclog/prefixLogger.go
index 82af70e96..02224b42c 100644
--- a/vendor/google.golang.org/grpc/internal/grpclog/prefixLogger.go
+++ b/vendor/google.golang.org/grpc/internal/grpclog/prefixLogger.go
@@ -63,6 +63,9 @@ func (pl *PrefixLogger) Errorf(format string, args ...interface{}) {
 
 // Debugf does info logging at verbose level 2.
 func (pl *PrefixLogger) Debugf(format string, args ...interface{}) {
+	// TODO(6044): Refactor interfaces LoggerV2 and DepthLogger, and maybe
+	// rewrite PrefixLogger a little to ensure that we don't use the global
+	// `Logger` here, and instead use the `logger` field.
 	if !Logger.V(2) {
 		return
 	}
@@ -73,6 +76,15 @@ func (pl *PrefixLogger) Debugf(format string, args ...interface{}) {
 		return
 	}
 	InfoDepth(1, fmt.Sprintf(format, args...))
+
+}
+
+// V reports whether verbosity level l is at least the requested verbose level.
+func (pl *PrefixLogger) V(l int) bool {
+	// TODO(6044): Refactor interfaces LoggerV2 and DepthLogger, and maybe
+	// rewrite PrefixLogger a little to ensure that we don't use the global
+	// `Logger` here, and instead use the `logger` field.
+	return Logger.V(l)
 }
 
 // NewPrefixLogger creates a prefix logger with the given prefix.
diff --git a/vendor/google.golang.org/grpc/internal/grpcrand/grpcrand.go b/vendor/google.golang.org/grpc/internal/grpcrand/grpcrand.go
index 740f83c2b..d08e3e907 100644
--- a/vendor/google.golang.org/grpc/internal/grpcrand/grpcrand.go
+++ b/vendor/google.golang.org/grpc/internal/grpcrand/grpcrand.go
@@ -52,6 +52,13 @@ func Intn(n int) int {
 	return r.Intn(n)
 }
 
+// Int31n implements rand.Int31n on the grpcrand global source.
+func Int31n(n int32) int32 {
+	mu.Lock()
+	defer mu.Unlock()
+	return r.Int31n(n)
+}
+
 // Float64 implements rand.Float64 on the grpcrand global source.
 func Float64() float64 {
 	mu.Lock()
@@ -65,3 +72,17 @@ func Uint64() uint64 {
 	defer mu.Unlock()
 	return r.Uint64()
 }
+
+// Uint32 implements rand.Uint32 on the grpcrand global source.
+func Uint32() uint32 {
+	mu.Lock()
+	defer mu.Unlock()
+	return r.Uint32()
+}
+
+// Shuffle implements rand.Shuffle on the grpcrand global source.
+var Shuffle = func(n int, f func(int, int)) {
+	mu.Lock()
+	defer mu.Unlock()
+	r.Shuffle(n, f)
+}
diff --git a/vendor/google.golang.org/grpc/internal/grpcsync/callback_serializer.go b/vendor/google.golang.org/grpc/internal/grpcsync/callback_serializer.go
new file mode 100644
index 000000000..37b8d4117
--- /dev/null
+++ b/vendor/google.golang.org/grpc/internal/grpcsync/callback_serializer.go
@@ -0,0 +1,119 @@
+/*
+ *
+ * Copyright 2022 gRPC authors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ *
+ */
+
+package grpcsync
+
+import (
+	"context"
+	"sync"
+
+	"google.golang.org/grpc/internal/buffer"
+)
+
+// CallbackSerializer provides a mechanism to schedule callbacks in a
+// synchronized manner. It provides a FIFO guarantee on the order of execution
+// of scheduled callbacks. New callbacks can be scheduled by invoking the
+// Schedule() method.
+//
+// This type is safe for concurrent access.
+type CallbackSerializer struct {
+	// Done is closed once the serializer is shut down completely, i.e all
+	// scheduled callbacks are executed and the serializer has deallocated all
+	// its resources.
+	Done chan struct{}
+
+	callbacks *buffer.Unbounded
+	closedMu  sync.Mutex
+	closed    bool
+}
+
+// NewCallbackSerializer returns a new CallbackSerializer instance. The provided
+// context will be passed to the scheduled callbacks. Users should cancel the
+// provided context to shutdown the CallbackSerializer. It is guaranteed that no
+// callbacks will be added once this context is canceled, and any pending un-run
+// callbacks will be executed before the serializer is shut down.
+func NewCallbackSerializer(ctx context.Context) *CallbackSerializer {
+	t := &CallbackSerializer{
+		Done:      make(chan struct{}),
+		callbacks: buffer.NewUnbounded(),
+	}
+	go t.run(ctx)
+	return t
+}
+
+// Schedule adds a callback to be scheduled after existing callbacks are run.
+//
+// Callbacks are expected to honor the context when performing any blocking
+// operations, and should return early when the context is canceled.
+//
+// Return value indicates if the callback was successfully added to the list of
+// callbacks to be executed by the serializer. It is not possible to add
+// callbacks once the context passed to NewCallbackSerializer is cancelled.
+func (t *CallbackSerializer) Schedule(f func(ctx context.Context)) bool {
+	t.closedMu.Lock()
+	defer t.closedMu.Unlock()
+
+	if t.closed {
+		return false
+	}
+	t.callbacks.Put(f)
+	return true
+}
+
+func (t *CallbackSerializer) run(ctx context.Context) {
+	var backlog []func(context.Context)
+
+	defer close(t.Done)
+	for ctx.Err() == nil {
+		select {
+		case <-ctx.Done():
+			// Do nothing here. Next iteration of the for loop will not happen,
+			// since ctx.Err() would be non-nil.
+		case callback, ok := <-t.callbacks.Get():
+			if !ok {
+				return
+			}
+			t.callbacks.Load()
+			callback.(func(ctx context.Context))(ctx)
+		}
+	}
+
+	// Fetch pending callbacks if any, and execute them before returning from
+	// this method and closing t.Done.
+	t.closedMu.Lock()
+	t.closed = true
+	backlog = t.fetchPendingCallbacks()
+	t.callbacks.Close()
+	t.closedMu.Unlock()
+	for _, b := range backlog {
+		b(ctx)
+	}
+}
+
+func (t *CallbackSerializer) fetchPendingCallbacks() []func(context.Context) {
+	var backlog []func(context.Context)
+	for {
+		select {
+		case b := <-t.callbacks.Get():
+			backlog = append(backlog, b.(func(context.Context)))
+			t.callbacks.Load()
+		default:
+			return backlog
+		}
+	}
+}
diff --git a/vendor/google.golang.org/grpc/internal/grpcsync/oncefunc.go b/vendor/google.golang.org/grpc/internal/grpcsync/oncefunc.go
new file mode 100644
index 000000000..6635f7bca
--- /dev/null
+++ b/vendor/google.golang.org/grpc/internal/grpcsync/oncefunc.go
@@ -0,0 +1,32 @@
+/*
+ *
+ * Copyright 2022 gRPC authors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ *
+ */
+
+package grpcsync
+
+import (
+	"sync"
+)
+
+// OnceFunc returns a function wrapping f which ensures f is only executed
+// once even if the returned function is executed multiple times.
+func OnceFunc(f func()) func() {
+	var once sync.Once
+	return func() {
+		once.Do(f)
+	}
+}
diff --git a/vendor/google.golang.org/grpc/internal/grpcutil/compressor.go b/vendor/google.golang.org/grpc/internal/grpcutil/compressor.go
new file mode 100644
index 000000000..9f4090967
--- /dev/null
+++ b/vendor/google.golang.org/grpc/internal/grpcutil/compressor.go
@@ -0,0 +1,47 @@
+/*
+ *
+ * Copyright 2022 gRPC authors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ *
+ */
+
+package grpcutil
+
+import (
+	"strings"
+
+	"google.golang.org/grpc/internal/envconfig"
+)
+
+// RegisteredCompressorNames holds names of the registered compressors.
+var RegisteredCompressorNames []string
+
+// IsCompressorNameRegistered returns true when name is available in registry.
+func IsCompressorNameRegistered(name string) bool {
+	for _, compressor := range RegisteredCompressorNames {
+		if compressor == name {
+			return true
+		}
+	}
+	return false
+}
+
+// RegisteredCompressors returns a string of registered compressor names
+// separated by comma.
+func RegisteredCompressors() string {
+	if !envconfig.AdvertiseCompressors {
+		return ""
+	}
+	return strings.Join(RegisteredCompressorNames, ",")
+}
diff --git a/vendor/google.golang.org/grpc/internal/grpcutil/method.go b/vendor/google.golang.org/grpc/internal/grpcutil/method.go
index e9c4af648..ec62b4775 100644
--- a/vendor/google.golang.org/grpc/internal/grpcutil/method.go
+++ b/vendor/google.golang.org/grpc/internal/grpcutil/method.go
@@ -25,7 +25,6 @@ import (
 
 // ParseMethod splits service and method from the input. It expects format
 // "/service/method".
-//
 func ParseMethod(methodName string) (service, method string, _ error) {
 	if !strings.HasPrefix(methodName, "/") {
 		return "", "", errors.New("invalid method name: should start with /")
diff --git a/vendor/google.golang.org/grpc/internal/internal.go b/vendor/google.golang.org/grpc/internal/internal.go
index 83018be7c..42ff39c84 100644
--- a/vendor/google.golang.org/grpc/internal/internal.go
+++ b/vendor/google.golang.org/grpc/internal/internal.go
@@ -58,25 +58,69 @@ var (
 	// gRPC server. An xDS-enabled server needs to know what type of credentials
 	// is configured on the underlying gRPC server. This is set by server.go.
 	GetServerCredentials interface{} // func (*grpc.Server) credentials.TransportCredentials
+	// CanonicalString returns the canonical string of the code defined here:
+	// https://github.com/grpc/grpc/blob/master/doc/statuscodes.md.
+	//
+	// This is used in the 1.0 release of gcp/observability, and thus must not be
+	// deleted or changed.
+	CanonicalString interface{} // func (codes.Code) string
 	// DrainServerTransports initiates a graceful close of existing connections
 	// on a gRPC server accepted on the provided listener address. An
 	// xDS-enabled server invokes this method on a grpc.Server when a particular
 	// listener moves to "not-serving" mode.
 	DrainServerTransports interface{} // func(*grpc.Server, string)
-	// AddExtraServerOptions adds an array of ServerOption that will be
+	// AddGlobalServerOptions adds an array of ServerOption that will be
 	// effective globally for newly created servers. The priority will be: 1.
 	// user-provided; 2. this method; 3. default values.
-	AddExtraServerOptions interface{} // func(opt ...ServerOption)
-	// ClearExtraServerOptions clears the array of extra ServerOption. This
+	//
+	// This is used in the 1.0 release of gcp/observability, and thus must not be
+	// deleted or changed.
+	AddGlobalServerOptions interface{} // func(opt ...ServerOption)
+	// ClearGlobalServerOptions clears the array of extra ServerOption. This
 	// method is useful in testing and benchmarking.
-	ClearExtraServerOptions func()
-	// AddExtraDialOptions adds an array of DialOption that will be effective
+	//
+	// This is used in the 1.0 release of gcp/observability, and thus must not be
+	// deleted or changed.
+	ClearGlobalServerOptions func()
+	// AddGlobalDialOptions adds an array of DialOption that will be effective
 	// globally for newly created client channels. The priority will be: 1.
 	// user-provided; 2. this method; 3. default values.
-	AddExtraDialOptions interface{} // func(opt ...DialOption)
-	// ClearExtraDialOptions clears the array of extra DialOption. This
+	//
+	// This is used in the 1.0 release of gcp/observability, and thus must not be
+	// deleted or changed.
+	AddGlobalDialOptions interface{} // func(opt ...DialOption)
+	// DisableGlobalDialOptions returns a DialOption that prevents the
+	// ClientConn from applying the global DialOptions (set via
+	// AddGlobalDialOptions).
+	//
+	// This is used in the 1.0 release of gcp/observability, and thus must not be
+	// deleted or changed.
+	DisableGlobalDialOptions interface{} // func() grpc.DialOption
+	// ClearGlobalDialOptions clears the array of extra DialOption. This
 	// method is useful in testing and benchmarking.
-	ClearExtraDialOptions func()
+	//
+	// This is used in the 1.0 release of gcp/observability, and thus must not be
+	// deleted or changed.
+	ClearGlobalDialOptions func()
+	// JoinDialOptions combines the dial options passed as arguments into a
+	// single dial option.
+	JoinDialOptions interface{} // func(...grpc.DialOption) grpc.DialOption
+	// JoinServerOptions combines the server options passed as arguments into a
+	// single server option.
+	JoinServerOptions interface{} // func(...grpc.ServerOption) grpc.ServerOption
+
+	// WithBinaryLogger returns a DialOption that specifies the binary logger
+	// for a ClientConn.
+	//
+	// This is used in the 1.0 release of gcp/observability, and thus must not be
+	// deleted or changed.
+	WithBinaryLogger interface{} // func(binarylog.Logger) grpc.DialOption
+	// BinaryLogger returns a ServerOption that can set the binary logger for a
+	// server.
+	//
+	// This is used in the 1.0 release of gcp/observability, and thus must not be
+	// deleted or changed.
+	BinaryLogger interface{} // func(binarylog.Logger) grpc.ServerOption
 
 	// NewXDSResolverWithConfigForTesting creates a new xds resolver builder using
 	// the provided xds bootstrap config instead of the global configuration from
@@ -118,21 +162,8 @@ var (
 	// TODO: Remove this function once the RBAC env var is removed.
 	UnregisterRBACHTTPFilterForTesting func()
 
-	// RegisterOutlierDetectionBalancerForTesting registers the Outlier
-	// Detection Balancer for testing purposes, regardless of the Outlier
-	// Detection environment variable.
-	//
-	// TODO: Remove this function once the Outlier Detection env var is removed.
-	RegisterOutlierDetectionBalancerForTesting func()
-
-	// UnregisterOutlierDetectionBalancerForTesting unregisters the Outlier
-	// Detection Balancer for testing purposes. This is needed because there is
-	// no way to unregister the Outlier Detection Balancer after registering it
-	// solely for testing purposes using
-	// RegisterOutlierDetectionBalancerForTesting().
-	//
-	// TODO: Remove this function once the Outlier Detection env var is removed.
-	UnregisterOutlierDetectionBalancerForTesting func()
+	// ORCAAllowAnyMinReportingInterval is for examples/orca use ONLY.
+	ORCAAllowAnyMinReportingInterval interface{} // func(so *orca.ServiceOptions)
 )
 
 // HealthChecker defines the signature of the client-side LB channel health checking function.
diff --git a/vendor/google.golang.org/grpc/internal/metadata/metadata.go b/vendor/google.golang.org/grpc/internal/metadata/metadata.go
index b2980f8ac..c82e608e0 100644
--- a/vendor/google.golang.org/grpc/internal/metadata/metadata.go
+++ b/vendor/google.golang.org/grpc/internal/metadata/metadata.go
@@ -76,33 +76,11 @@ func Set(addr resolver.Address, md metadata.MD) resolver.Address {
 	return addr
 }
 
-// Validate returns an error if the input md contains invalid keys or values.
-//
-// If the header is not a pseudo-header, the following items are checked:
-// - header names must contain one or more characters from this set [0-9 a-z _ - .].
-// - if the header-name ends with a "-bin" suffix, no validation of the header value is performed.
-// - otherwise, the header value must contain one or more characters from the set [%x20-%x7E].
+// Validate validates every pair in md with ValidatePair.
 func Validate(md metadata.MD) error {
 	for k, vals := range md {
-		// pseudo-header will be ignored
-		if k[0] == ':' {
-			continue
-		}
-		// check key, for i that saving a conversion if not using for range
-		for i := 0; i < len(k); i++ {
-			r := k[i]
-			if !(r >= 'a' && r <= 'z') && !(r >= '0' && r <= '9') && r != '.' && r != '-' && r != '_' {
-				return fmt.Errorf("header key %q contains illegal characters not in [0-9a-z-_.]", k)
-			}
-		}
-		if strings.HasSuffix(k, "-bin") {
-			continue
-		}
-		// check value
-		for _, val := range vals {
-			if hasNotPrintable(val) {
-				return fmt.Errorf("header key %q contains value with non-printable ASCII characters", k)
-			}
+		if err := ValidatePair(k, vals...); err != nil {
+			return err
 		}
 	}
 	return nil
@@ -118,3 +96,37 @@ func hasNotPrintable(msg string) bool {
 	}
 	return false
 }
+
+// ValidatePair validate a key-value pair with the following rules (the pseudo-header will be skipped) :
+//
+// - key must contain one or more characters.
+// - the characters in the key must be contained in [0-9 a-z _ - .].
+// - if the key ends with a "-bin" suffix, no validation of the corresponding value is performed.
+// - the characters in the every value must be printable (in [%x20-%x7E]).
+func ValidatePair(key string, vals ...string) error {
+	// key should not be empty
+	if key == "" {
+		return fmt.Errorf("there is an empty key in the header")
+	}
+	// pseudo-header will be ignored
+	if key[0] == ':' {
+		return nil
+	}
+	// check key, for i that saving a conversion if not using for range
+	for i := 0; i < len(key); i++ {
+		r := key[i]
+		if !(r >= 'a' && r <= 'z') && !(r >= '0' && r <= '9') && r != '.' && r != '-' && r != '_' {
+			return fmt.Errorf("header key %q contains illegal characters not in [0-9a-z-_.]", key)
+		}
+	}
+	if strings.HasSuffix(key, "-bin") {
+		return nil
+	}
+	// check value
+	for _, val := range vals {
+		if hasNotPrintable(val) {
+			return fmt.Errorf("header key %q contains value with non-printable ASCII characters", key)
+		}
+	}
+	return nil
+}
diff --git a/vendor/google.golang.org/grpc/internal/resolver/dns/dns_resolver.go b/vendor/google.golang.org/grpc/internal/resolver/dns/dns_resolver.go
index 75301c514..09a667f33 100644
--- a/vendor/google.golang.org/grpc/internal/resolver/dns/dns_resolver.go
+++ b/vendor/google.golang.org/grpc/internal/resolver/dns/dns_resolver.go
@@ -116,7 +116,7 @@ type dnsBuilder struct{}
 
 // Build creates and starts a DNS resolver that watches the name resolution of the target.
 func (b *dnsBuilder) Build(target resolver.Target, cc resolver.ClientConn, opts resolver.BuildOptions) (resolver.Resolver, error) {
-	host, port, err := parseTarget(target.Endpoint, defaultPort)
+	host, port, err := parseTarget(target.Endpoint(), defaultPort)
 	if err != nil {
 		return nil, err
 	}
@@ -140,10 +140,10 @@ func (b *dnsBuilder) Build(target resolver.Target, cc resolver.ClientConn, opts
 		disableServiceConfig: opts.DisableServiceConfig,
 	}
 
-	if target.Authority == "" {
+	if target.URL.Host == "" {
 		d.resolver = defaultResolver
 	} else {
-		d.resolver, err = customAuthorityResolver(target.Authority)
+		d.resolver, err = customAuthorityResolver(target.URL.Host)
 		if err != nil {
 			return nil, err
 		}
diff --git a/vendor/google.golang.org/grpc/internal/resolver/passthrough/passthrough.go b/vendor/google.golang.org/grpc/internal/resolver/passthrough/passthrough.go
index 520d9229e..afac56572 100644
--- a/vendor/google.golang.org/grpc/internal/resolver/passthrough/passthrough.go
+++ b/vendor/google.golang.org/grpc/internal/resolver/passthrough/passthrough.go
@@ -20,13 +20,20 @@
 // name without scheme back to gRPC as resolved address.
 package passthrough
 
-import "google.golang.org/grpc/resolver"
+import (
+	"errors"
+
+	"google.golang.org/grpc/resolver"
+)
 
 const scheme = "passthrough"
 
 type passthroughBuilder struct{}
 
 func (*passthroughBuilder) Build(target resolver.Target, cc resolver.ClientConn, opts resolver.BuildOptions) (resolver.Resolver, error) {
+	if target.Endpoint() == "" && opts.Dialer == nil {
+		return nil, errors.New("passthrough: received empty target in Build()")
+	}
 	r := &passthroughResolver{
 		target: target,
 		cc:     cc,
@@ -45,7 +52,7 @@ type passthroughResolver struct {
 }
 
 func (r *passthroughResolver) start() {
-	r.cc.UpdateState(resolver.State{Addresses: []resolver.Address{{Addr: r.target.Endpoint}}})
+	r.cc.UpdateState(resolver.State{Addresses: []resolver.Address{{Addr: r.target.Endpoint()}}})
 }
 
 func (*passthroughResolver) ResolveNow(o resolver.ResolveNowOptions) {}
diff --git a/vendor/google.golang.org/grpc/internal/resolver/unix/unix.go b/vendor/google.golang.org/grpc/internal/resolver/unix/unix.go
index 20852e59d..160911687 100644
--- a/vendor/google.golang.org/grpc/internal/resolver/unix/unix.go
+++ b/vendor/google.golang.org/grpc/internal/resolver/unix/unix.go
@@ -34,8 +34,8 @@ type builder struct {
 }
 
 func (b *builder) Build(target resolver.Target, cc resolver.ClientConn, _ resolver.BuildOptions) (resolver.Resolver, error) {
-	if target.Authority != "" {
-		return nil, fmt.Errorf("invalid (non-empty) authority: %v", target.Authority)
+	if target.URL.Host != "" {
+		return nil, fmt.Errorf("invalid (non-empty) authority: %v", target.URL.Host)
 	}
 
 	// gRPC was parsing the dial target manually before PR #4817, and we
@@ -49,8 +49,9 @@ func (b *builder) Build(target resolver.Target, cc resolver.ClientConn, _ resolv
 	}
 	addr := resolver.Address{Addr: endpoint}
 	if b.scheme == unixAbstractScheme {
-		// prepend "\x00" to address for unix-abstract
-		addr.Addr = "\x00" + addr.Addr
+		// We can not prepend \0 as c++ gRPC does, as in Golang '@' is used to signify we do
+		// not want trailing \0 in address.
+		addr.Addr = "@" + addr.Addr
 	}
 	cc.UpdateState(resolver.State{Addresses: []resolver.Address{networktype.Set(addr, "unix")}})
 	return &nopResolver{}, nil
diff --git a/vendor/google.golang.org/grpc/internal/serviceconfig/duration.go b/vendor/google.golang.org/grpc/internal/serviceconfig/duration.go
new file mode 100644
index 000000000..11d82afcc
--- /dev/null
+++ b/vendor/google.golang.org/grpc/internal/serviceconfig/duration.go
@@ -0,0 +1,130 @@
+/*
+ *
+ * Copyright 2023 gRPC authors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ *
+ */
+
+package serviceconfig
+
+import (
+	"encoding/json"
+	"fmt"
+	"math"
+	"strconv"
+	"strings"
+	"time"
+)
+
+// Duration defines JSON marshal and unmarshal methods to conform to the
+// protobuf JSON spec defined [here].
+//
+// [here]: https://protobuf.dev/reference/protobuf/google.protobuf/#duration
+type Duration time.Duration
+
+func (d Duration) String() string {
+	return fmt.Sprint(time.Duration(d))
+}
+
+// MarshalJSON converts from d to a JSON string output.
+func (d Duration) MarshalJSON() ([]byte, error) {
+	ns := time.Duration(d).Nanoseconds()
+	sec := ns / int64(time.Second)
+	ns = ns % int64(time.Second)
+
+	var sign string
+	if sec < 0 || ns < 0 {
+		sign, sec, ns = "-", -1*sec, -1*ns
+	}
+
+	// Generated output always contains 0, 3, 6, or 9 fractional digits,
+	// depending on required precision.
+	str := fmt.Sprintf("%s%d.%09d", sign, sec, ns)
+	str = strings.TrimSuffix(str, "000")
+	str = strings.TrimSuffix(str, "000")
+	str = strings.TrimSuffix(str, ".000")
+	return []byte(fmt.Sprintf("\"%ss\"", str)), nil
+}
+
+// UnmarshalJSON unmarshals b as a duration JSON string into d.
+func (d *Duration) UnmarshalJSON(b []byte) error {
+	var s string
+	if err := json.Unmarshal(b, &s); err != nil {
+		return err
+	}
+	if !strings.HasSuffix(s, "s") {
+		return fmt.Errorf("malformed duration %q: missing seconds unit", s)
+	}
+	neg := false
+	if s[0] == '-' {
+		neg = true
+		s = s[1:]
+	}
+	ss := strings.SplitN(s[:len(s)-1], ".", 3)
+	if len(ss) > 2 {
+		return fmt.Errorf("malformed duration %q: too many decimals", s)
+	}
+	// hasDigits is set if either the whole or fractional part of the number is
+	// present, since both are optional but one is required.
+	hasDigits := false
+	var sec, ns int64
+	if len(ss[0]) > 0 {
+		var err error
+		if sec, err = strconv.ParseInt(ss[0], 10, 64); err != nil {
+			return fmt.Errorf("malformed duration %q: %v", s, err)
+		}
+		// Maximum seconds value per the durationpb spec.
+		const maxProtoSeconds = 315_576_000_000
+		if sec > maxProtoSeconds {
+			return fmt.Errorf("out of range: %q", s)
+		}
+		hasDigits = true
+	}
+	if len(ss) == 2 && len(ss[1]) > 0 {
+		if len(ss[1]) > 9 {
+			return fmt.Errorf("malformed duration %q: too many digits after decimal", s)
+		}
+		var err error
+		if ns, err = strconv.ParseInt(ss[1], 10, 64); err != nil {
+			return fmt.Errorf("malformed duration %q: %v", s, err)
+		}
+		for i := 9; i > len(ss[1]); i-- {
+			ns *= 10
+		}
+		hasDigits = true
+	}
+	if !hasDigits {
+		return fmt.Errorf("malformed duration %q: contains no numbers", s)
+	}
+
+	if neg {
+		sec *= -1
+		ns *= -1
+	}
+
+	// Maximum/minimum seconds/nanoseconds representable by Go's time.Duration.
+	const maxSeconds = math.MaxInt64 / int64(time.Second)
+	const maxNanosAtMaxSeconds = math.MaxInt64 % int64(time.Second)
+	const minSeconds = math.MinInt64 / int64(time.Second)
+	const minNanosAtMinSeconds = math.MinInt64 % int64(time.Second)
+
+	if sec > maxSeconds || (sec == maxSeconds && ns >= maxNanosAtMaxSeconds) {
+		*d = Duration(math.MaxInt64)
+	} else if sec < minSeconds || (sec == minSeconds && ns <= minNanosAtMinSeconds) {
+		*d = Duration(math.MinInt64)
+	} else {
+		*d = Duration(sec*int64(time.Second) + ns)
+	}
+	return nil
+}
diff --git a/vendor/google.golang.org/grpc/internal/serviceconfig/serviceconfig.go b/vendor/google.golang.org/grpc/internal/serviceconfig/serviceconfig.go
index badbdbf59..51e733e49 100644
--- a/vendor/google.golang.org/grpc/internal/serviceconfig/serviceconfig.go
+++ b/vendor/google.golang.org/grpc/internal/serviceconfig/serviceconfig.go
@@ -67,10 +67,10 @@ func (bc *BalancerConfig) MarshalJSON() ([]byte, error) {
 // ServiceConfig contains a list of loadBalancingConfigs, each with a name and
 // config. This method iterates through that list in order, and stops at the
 // first policy that is supported.
-// - If the config for the first supported policy is invalid, the whole service
-//   config is invalid.
-// - If the list doesn't contain any supported policy, the whole service config
-//   is invalid.
+//   - If the config for the first supported policy is invalid, the whole service
+//     config is invalid.
+//   - If the list doesn't contain any supported policy, the whole service config
+//     is invalid.
 func (bc *BalancerConfig) UnmarshalJSON(b []byte) error {
 	var ir intermediateBalancerConfig
 	err := json.Unmarshal(b, &ir)
diff --git a/vendor/google.golang.org/grpc/internal/status/status.go b/vendor/google.golang.org/grpc/internal/status/status.go
index e5c6513ed..b0ead4f54 100644
--- a/vendor/google.golang.org/grpc/internal/status/status.go
+++ b/vendor/google.golang.org/grpc/internal/status/status.go
@@ -164,3 +164,13 @@ func (e *Error) Is(target error) bool {
 	}
 	return proto.Equal(e.s.s, tse.s.s)
 }
+
+// IsRestrictedControlPlaneCode returns whether the status includes a code
+// restricted for control plane usage as defined by gRFC A54.
+func IsRestrictedControlPlaneCode(s *Status) bool {
+	switch s.Code() {
+	case codes.InvalidArgument, codes.NotFound, codes.AlreadyExists, codes.FailedPrecondition, codes.Aborted, codes.OutOfRange, codes.DataLoss:
+		return true
+	}
+	return false
+}
diff --git a/vendor/google.golang.org/grpc/internal/transport/controlbuf.go b/vendor/google.golang.org/grpc/internal/transport/controlbuf.go
index 244f4b081..be5a9c81e 100644
--- a/vendor/google.golang.org/grpc/internal/transport/controlbuf.go
+++ b/vendor/google.golang.org/grpc/internal/transport/controlbuf.go
@@ -22,6 +22,7 @@ import (
 	"bytes"
 	"errors"
 	"fmt"
+	"net"
 	"runtime"
 	"strconv"
 	"sync"
@@ -29,6 +30,7 @@ import (
 
 	"golang.org/x/net/http2"
 	"golang.org/x/net/http2/hpack"
+	"google.golang.org/grpc/internal/grpclog"
 	"google.golang.org/grpc/internal/grpcutil"
 	"google.golang.org/grpc/status"
 )
@@ -191,7 +193,7 @@ type goAway struct {
 	code      http2.ErrCode
 	debugData []byte
 	headsUp   bool
-	closeConn bool
+	closeConn error // if set, loopyWriter will exit, resulting in conn closure
 }
 
 func (*goAway) isTransportResponseFrame() bool { return false }
@@ -209,6 +211,14 @@ type outFlowControlSizeRequest struct {
 
 func (*outFlowControlSizeRequest) isTransportResponseFrame() bool { return false }
 
+// closeConnection is an instruction to tell the loopy writer to flush the
+// framer and exit, which will cause the transport's connection to be closed
+// (by the client or server).  The transport itself will close after the reader
+// encounters the EOF caused by the connection closure.
+type closeConnection struct{}
+
+func (closeConnection) isTransportResponseFrame() bool { return false }
+
 type outStreamState int
 
 const (
@@ -408,7 +418,7 @@ func (c *controlBuffer) get(block bool) (interface{}, error) {
 		select {
 		case <-c.ch:
 		case <-c.done:
-			return nil, ErrConnClosing
+			return nil, errors.New("transport closed by client")
 		}
 	}
 }
@@ -478,12 +488,14 @@ type loopyWriter struct {
 	hEnc          *hpack.Encoder // HPACK encoder.
 	bdpEst        *bdpEstimator
 	draining      bool
+	conn          net.Conn
+	logger        *grpclog.PrefixLogger
 
 	// Side-specific handlers
 	ssGoAwayHandler func(*goAway) (bool, error)
 }
 
-func newLoopyWriter(s side, fr *framer, cbuf *controlBuffer, bdpEst *bdpEstimator) *loopyWriter {
+func newLoopyWriter(s side, fr *framer, cbuf *controlBuffer, bdpEst *bdpEstimator, conn net.Conn, logger *grpclog.PrefixLogger) *loopyWriter {
 	var buf bytes.Buffer
 	l := &loopyWriter{
 		side:          s,
@@ -496,6 +508,8 @@ func newLoopyWriter(s side, fr *framer, cbuf *controlBuffer, bdpEst *bdpEstimato
 		hBuf:          &buf,
 		hEnc:          hpack.NewEncoder(&buf),
 		bdpEst:        bdpEst,
+		conn:          conn,
+		logger:        logger,
 	}
 	return l
 }
@@ -513,23 +527,26 @@ const minBatchSize = 1000
 // 2. Stream level flow control quota available.
 //
 // In each iteration of run loop, other than processing the incoming control
-// frame, loopy calls processData, which processes one node from the activeStreams linked-list.
-// This results in writing of HTTP2 frames into an underlying write buffer.
-// When there's no more control frames to read from controlBuf, loopy flushes the write buffer.
-// As an optimization, to increase the batch size for each flush, loopy yields the processor, once
-// if the batch size is too low to give stream goroutines a chance to fill it up.
+// frame, loopy calls processData, which processes one node from the
+// activeStreams linked-list.  This results in writing of HTTP2 frames into an
+// underlying write buffer.  When there's no more control frames to read from
+// controlBuf, loopy flushes the write buffer.  As an optimization, to increase
+// the batch size for each flush, loopy yields the processor, once if the batch
+// size is too low to give stream goroutines a chance to fill it up.
+//
+// Upon exiting, if the error causing the exit is not an I/O error, run()
+// flushes and closes the underlying connection.  Otherwise, the connection is
+// left open to allow the I/O error to be encountered by the reader instead.
 func (l *loopyWriter) run() (err error) {
 	defer func() {
-		if err == ErrConnClosing {
-			// Don't log ErrConnClosing as error since it happens
-			// 1. When the connection is closed by some other known issue.
-			// 2. User closed the connection.
-			// 3. A graceful close of connection.
-			if logger.V(logLevel) {
-				logger.Infof("transport: loopyWriter.run returning. %v", err)
-			}
-			err = nil
+		if l.logger.V(logLevel) {
+			l.logger.Infof("loopyWriter exiting with error: %v", err)
 		}
+		if !isIOError(err) {
+			l.framer.writer.Flush()
+			l.conn.Close()
+		}
+		l.cbuf.finish()
 	}()
 	for {
 		it, err := l.cbuf.get(true)
@@ -574,7 +591,6 @@ func (l *loopyWriter) run() (err error) {
 			}
 			l.framer.writer.Flush()
 			break hasdata
-
 		}
 	}
 }
@@ -583,11 +599,11 @@ func (l *loopyWriter) outgoingWindowUpdateHandler(w *outgoingWindowUpdate) error
 	return l.framer.fr.WriteWindowUpdate(w.streamID, w.increment)
 }
 
-func (l *loopyWriter) incomingWindowUpdateHandler(w *incomingWindowUpdate) error {
+func (l *loopyWriter) incomingWindowUpdateHandler(w *incomingWindowUpdate) {
 	// Otherwise update the quota.
 	if w.streamID == 0 {
 		l.sendQuota += w.increment
-		return nil
+		return
 	}
 	// Find the stream and update it.
 	if str, ok := l.estdStreams[w.streamID]; ok {
@@ -595,10 +611,9 @@ func (l *loopyWriter) incomingWindowUpdateHandler(w *incomingWindowUpdate) error
 		if strQuota := int(l.oiws) - str.bytesOutStanding; strQuota > 0 && str.state == waitingOnStreamQuota {
 			str.state = active
 			l.activeStreams.enqueue(str)
-			return nil
+			return
 		}
 	}
-	return nil
 }
 
 func (l *loopyWriter) outgoingSettingsHandler(s *outgoingSettings) error {
@@ -606,13 +621,11 @@ func (l *loopyWriter) outgoingSettingsHandler(s *outgoingSettings) error {
 }
 
 func (l *loopyWriter) incomingSettingsHandler(s *incomingSettings) error {
-	if err := l.applySettings(s.ss); err != nil {
-		return err
-	}
+	l.applySettings(s.ss)
 	return l.framer.fr.WriteSettingsAck()
 }
 
-func (l *loopyWriter) registerStreamHandler(h *registerStream) error {
+func (l *loopyWriter) registerStreamHandler(h *registerStream) {
 	str := &outStream{
 		id:    h.streamID,
 		state: empty,
@@ -620,15 +633,14 @@ func (l *loopyWriter) registerStreamHandler(h *registerStream) error {
 		wq:    h.wq,
 	}
 	l.estdStreams[h.streamID] = str
-	return nil
 }
 
 func (l *loopyWriter) headerHandler(h *headerFrame) error {
 	if l.side == serverSide {
 		str, ok := l.estdStreams[h.streamID]
 		if !ok {
-			if logger.V(logLevel) {
-				logger.Warningf("transport: loopy doesn't recognize the stream: %d", h.streamID)
+			if l.logger.V(logLevel) {
+				l.logger.Infof("Unrecognized streamID %d in loopyWriter", h.streamID)
 			}
 			return nil
 		}
@@ -655,19 +667,20 @@ func (l *loopyWriter) headerHandler(h *headerFrame) error {
 		itl:   &itemList{},
 		wq:    h.wq,
 	}
-	str.itl.enqueue(h)
-	return l.originateStream(str)
+	return l.originateStream(str, h)
 }
 
-func (l *loopyWriter) originateStream(str *outStream) error {
-	hdr := str.itl.dequeue().(*headerFrame)
-	if err := hdr.initStream(str.id); err != nil {
-		if err == ErrConnClosing {
-			return err
-		}
-		// Other errors(errStreamDrain) need not close transport.
+func (l *loopyWriter) originateStream(str *outStream, hdr *headerFrame) error {
+	// l.draining is set when handling GoAway. In which case, we want to avoid
+	// creating new streams.
+	if l.draining {
+		// TODO: provide a better error with the reason we are in draining.
+		hdr.onOrphaned(errStreamDrain)
 		return nil
 	}
+	if err := hdr.initStream(str.id); err != nil {
+		return err
+	}
 	if err := l.writeHeader(str.id, hdr.endStream, hdr.hf, hdr.onWrite); err != nil {
 		return err
 	}
@@ -682,8 +695,8 @@ func (l *loopyWriter) writeHeader(streamID uint32, endStream bool, hf []hpack.He
 	l.hBuf.Reset()
 	for _, f := range hf {
 		if err := l.hEnc.WriteField(f); err != nil {
-			if logger.V(logLevel) {
-				logger.Warningf("transport: loopyWriter.writeHeader encountered error while encoding headers: %v", err)
+			if l.logger.V(logLevel) {
+				l.logger.Warningf("Encountered error while encoding headers: %v", err)
 			}
 		}
 	}
@@ -721,10 +734,10 @@ func (l *loopyWriter) writeHeader(streamID uint32, endStream bool, hf []hpack.He
 	return nil
 }
 
-func (l *loopyWriter) preprocessData(df *dataFrame) error {
+func (l *loopyWriter) preprocessData(df *dataFrame) {
 	str, ok := l.estdStreams[df.streamID]
 	if !ok {
-		return nil
+		return
 	}
 	// If we got data for a stream it means that
 	// stream was originated and the headers were sent out.
@@ -733,7 +746,6 @@ func (l *loopyWriter) preprocessData(df *dataFrame) error {
 		str.state = active
 		l.activeStreams.enqueue(str)
 	}
-	return nil
 }
 
 func (l *loopyWriter) pingHandler(p *ping) error {
@@ -744,9 +756,8 @@ func (l *loopyWriter) pingHandler(p *ping) error {
 
 }
 
-func (l *loopyWriter) outFlowControlSizeRequestHandler(o *outFlowControlSizeRequest) error {
+func (l *loopyWriter) outFlowControlSizeRequestHandler(o *outFlowControlSizeRequest) {
 	o.resp <- l.sendQuota
-	return nil
 }
 
 func (l *loopyWriter) cleanupStreamHandler(c *cleanupStream) error {
@@ -763,8 +774,9 @@ func (l *loopyWriter) cleanupStreamHandler(c *cleanupStream) error {
 			return err
 		}
 	}
-	if l.side == clientSide && l.draining && len(l.estdStreams) == 0 {
-		return ErrConnClosing
+	if l.draining && len(l.estdStreams) == 0 {
+		// Flush and close the connection; we are done with it.
+		return errors.New("finished processing active streams while in draining mode")
 	}
 	return nil
 }
@@ -799,7 +811,8 @@ func (l *loopyWriter) incomingGoAwayHandler(*incomingGoAway) error {
 	if l.side == clientSide {
 		l.draining = true
 		if len(l.estdStreams) == 0 {
-			return ErrConnClosing
+			// Flush and close the connection; we are done with it.
+			return errors.New("received GOAWAY with no active streams")
 		}
 	}
 	return nil
@@ -820,7 +833,7 @@ func (l *loopyWriter) goAwayHandler(g *goAway) error {
 func (l *loopyWriter) handle(i interface{}) error {
 	switch i := i.(type) {
 	case *incomingWindowUpdate:
-		return l.incomingWindowUpdateHandler(i)
+		l.incomingWindowUpdateHandler(i)
 	case *outgoingWindowUpdate:
 		return l.outgoingWindowUpdateHandler(i)
 	case *incomingSettings:
@@ -830,7 +843,7 @@ func (l *loopyWriter) handle(i interface{}) error {
 	case *headerFrame:
 		return l.headerHandler(i)
 	case *registerStream:
-		return l.registerStreamHandler(i)
+		l.registerStreamHandler(i)
 	case *cleanupStream:
 		return l.cleanupStreamHandler(i)
 	case *earlyAbortStream:
@@ -838,19 +851,24 @@ func (l *loopyWriter) handle(i interface{}) error {
 	case *incomingGoAway:
 		return l.incomingGoAwayHandler(i)
 	case *dataFrame:
-		return l.preprocessData(i)
+		l.preprocessData(i)
 	case *ping:
 		return l.pingHandler(i)
 	case *goAway:
 		return l.goAwayHandler(i)
 	case *outFlowControlSizeRequest:
-		return l.outFlowControlSizeRequestHandler(i)
+		l.outFlowControlSizeRequestHandler(i)
+	case closeConnection:
+		// Just return a non-I/O error and run() will flush and close the
+		// connection.
+		return ErrConnClosing
 	default:
 		return fmt.Errorf("transport: unknown control message type %T", i)
 	}
+	return nil
 }
 
-func (l *loopyWriter) applySettings(ss []http2.Setting) error {
+func (l *loopyWriter) applySettings(ss []http2.Setting) {
 	for _, s := range ss {
 		switch s.ID {
 		case http2.SettingInitialWindowSize:
@@ -869,7 +887,6 @@ func (l *loopyWriter) applySettings(ss []http2.Setting) error {
 			updateHeaderTblSize(l.hEnc, s.Val)
 		}
 	}
-	return nil
 }
 
 // processData removes the first stream from active streams, writes out at most 16KB
@@ -886,9 +903,9 @@ func (l *loopyWriter) processData() (bool, error) {
 	dataItem := str.itl.peek().(*dataFrame) // Peek at the first data item this stream.
 	// A data item is represented by a dataFrame, since it later translates into
 	// multiple HTTP2 data frames.
-	// Every dataFrame has two buffers; h that keeps grpc-message header and d that is acutal data.
+	// Every dataFrame has two buffers; h that keeps grpc-message header and d that is actual data.
 	// As an optimization to keep wire traffic low, data from d is copied to h to make as big as the
-	// maximum possilbe HTTP2 frame size.
+	// maximum possible HTTP2 frame size.
 
 	if len(dataItem.h) == 0 && len(dataItem.d) == 0 { // Empty data frame
 		// Client sends out empty data frame with endStream = true
@@ -903,7 +920,7 @@ func (l *loopyWriter) processData() (bool, error) {
 				return false, err
 			}
 			if err := l.cleanupStreamHandler(trailer.cleanup); err != nil {
-				return false, nil
+				return false, err
 			}
 		} else {
 			l.activeStreams.enqueue(str)
diff --git a/vendor/google.golang.org/grpc/internal/transport/defaults.go b/vendor/google.golang.org/grpc/internal/transport/defaults.go
index 9fa306b2e..bc8ee0747 100644
--- a/vendor/google.golang.org/grpc/internal/transport/defaults.go
+++ b/vendor/google.golang.org/grpc/internal/transport/defaults.go
@@ -47,3 +47,9 @@ const (
 	defaultClientMaxHeaderListSize = uint32(16 << 20)
 	defaultServerMaxHeaderListSize = uint32(16 << 20)
 )
+
+// MaxStreamID is the upper bound for the stream ID before the current
+// transport gracefully closes and new transport is created for subsequent RPCs.
+// This is set to 75% of 2^31-1. Streams are identified with an unsigned 31-bit
+// integer. It's exported so that tests can override it.
+var MaxStreamID = uint32(math.MaxInt32 * 3 / 4)
diff --git a/vendor/google.golang.org/grpc/internal/transport/handler_server.go b/vendor/google.golang.org/grpc/internal/transport/handler_server.go
index 090120925..98f80e3fa 100644
--- a/vendor/google.golang.org/grpc/internal/transport/handler_server.go
+++ b/vendor/google.golang.org/grpc/internal/transport/handler_server.go
@@ -39,6 +39,7 @@ import (
 	"golang.org/x/net/http2"
 	"google.golang.org/grpc/codes"
 	"google.golang.org/grpc/credentials"
+	"google.golang.org/grpc/internal/grpclog"
 	"google.golang.org/grpc/internal/grpcutil"
 	"google.golang.org/grpc/metadata"
 	"google.golang.org/grpc/peer"
@@ -46,24 +47,32 @@ import (
 	"google.golang.org/grpc/status"
 )
 
-// NewServerHandlerTransport returns a ServerTransport handling gRPC
-// from inside an http.Handler. It requires that the http Server
-// supports HTTP/2.
+// NewServerHandlerTransport returns a ServerTransport handling gRPC from
+// inside an http.Handler, or writes an HTTP error to w and returns an error.
+// It requires that the http Server supports HTTP/2.
 func NewServerHandlerTransport(w http.ResponseWriter, r *http.Request, stats []stats.Handler) (ServerTransport, error) {
 	if r.ProtoMajor != 2 {
-		return nil, errors.New("gRPC requires HTTP/2")
+		msg := "gRPC requires HTTP/2"
+		http.Error(w, msg, http.StatusBadRequest)
+		return nil, errors.New(msg)
 	}
 	if r.Method != "POST" {
-		return nil, errors.New("invalid gRPC request method")
+		msg := fmt.Sprintf("invalid gRPC request method %q", r.Method)
+		http.Error(w, msg, http.StatusBadRequest)
+		return nil, errors.New(msg)
 	}
 	contentType := r.Header.Get("Content-Type")
 	// TODO: do we assume contentType is lowercase? we did before
 	contentSubtype, validContentType := grpcutil.ContentSubtype(contentType)
 	if !validContentType {
-		return nil, errors.New("invalid gRPC request content-type")
+		msg := fmt.Sprintf("invalid gRPC request content-type %q", contentType)
+		http.Error(w, msg, http.StatusUnsupportedMediaType)
+		return nil, errors.New(msg)
 	}
 	if _, ok := w.(http.Flusher); !ok {
-		return nil, errors.New("gRPC requires a ResponseWriter supporting http.Flusher")
+		msg := "gRPC requires a ResponseWriter supporting http.Flusher"
+		http.Error(w, msg, http.StatusInternalServerError)
+		return nil, errors.New(msg)
 	}
 
 	st := &serverHandlerTransport{
@@ -75,11 +84,14 @@ func NewServerHandlerTransport(w http.ResponseWriter, r *http.Request, stats []s
 		contentSubtype: contentSubtype,
 		stats:          stats,
 	}
+	st.logger = prefixLoggerForServerHandlerTransport(st)
 
 	if v := r.Header.Get("grpc-timeout"); v != "" {
 		to, err := decodeTimeout(v)
 		if err != nil {
-			return nil, status.Errorf(codes.Internal, "malformed time-out: %v", err)
+			msg := fmt.Sprintf("malformed grpc-timeout: %v", err)
+			http.Error(w, msg, http.StatusBadRequest)
+			return nil, status.Error(codes.Internal, msg)
 		}
 		st.timeoutSet = true
 		st.timeout = to
@@ -97,7 +109,9 @@ func NewServerHandlerTransport(w http.ResponseWriter, r *http.Request, stats []s
 		for _, v := range vv {
 			v, err := decodeMetadataHeader(k, v)
 			if err != nil {
-				return nil, status.Errorf(codes.Internal, "malformed binary metadata: %v", err)
+				msg := fmt.Sprintf("malformed binary metadata %q in header %q: %v", v, k, err)
+				http.Error(w, msg, http.StatusBadRequest)
+				return nil, status.Error(codes.Internal, msg)
 			}
 			metakv = append(metakv, k, v)
 		}
@@ -138,15 +152,19 @@ type serverHandlerTransport struct {
 	// TODO make sure this is consistent across handler_server and http2_server
 	contentSubtype string
 
-	stats []stats.Handler
+	stats  []stats.Handler
+	logger *grpclog.PrefixLogger
 }
 
-func (ht *serverHandlerTransport) Close() {
-	ht.closeOnce.Do(ht.closeCloseChanOnce)
+func (ht *serverHandlerTransport) Close(err error) {
+	ht.closeOnce.Do(func() {
+		if ht.logger.V(logLevel) {
+			ht.logger.Infof("Closing: %v", err)
+		}
+		close(ht.closedCh)
+	})
 }
 
-func (ht *serverHandlerTransport) closeCloseChanOnce() { close(ht.closedCh) }
-
 func (ht *serverHandlerTransport) RemoteAddr() net.Addr { return strAddr(ht.req.RemoteAddr) }
 
 // strAddr is a net.Addr backed by either a TCP "ip:port" string, or
@@ -236,7 +254,7 @@ func (ht *serverHandlerTransport) WriteStatus(s *Stream, st *status.Status) erro
 			})
 		}
 	}
-	ht.Close()
+	ht.Close(errors.New("finished writing status"))
 	return err
 }
 
@@ -346,7 +364,7 @@ func (ht *serverHandlerTransport) HandleStreams(startStream func(*Stream), trace
 		case <-ht.req.Context().Done():
 		}
 		cancel()
-		ht.Close()
+		ht.Close(errors.New("request is done processing"))
 	}()
 
 	req := ht.req
@@ -435,17 +453,17 @@ func (ht *serverHandlerTransport) IncrMsgSent() {}
 
 func (ht *serverHandlerTransport) IncrMsgRecv() {}
 
-func (ht *serverHandlerTransport) Drain() {
+func (ht *serverHandlerTransport) Drain(debugData string) {
 	panic("Drain() is not implemented")
 }
 
 // mapRecvMsgError returns the non-nil err into the appropriate
 // error value as expected by callers of *grpc.parser.recvMsg.
 // In particular, in can only be:
-//   * io.EOF
-//   * io.ErrUnexpectedEOF
-//   * of type transport.ConnectionError
-//   * an error from the status package
+//   - io.EOF
+//   - io.ErrUnexpectedEOF
+//   - of type transport.ConnectionError
+//   - an error from the status package
 func mapRecvMsgError(err error) error {
 	if err == io.EOF || err == io.ErrUnexpectedEOF {
 		return err
diff --git a/vendor/google.golang.org/grpc/internal/transport/http2_client.go b/vendor/google.golang.org/grpc/internal/transport/http2_client.go
index 28c77af70..326bf0848 100644
--- a/vendor/google.golang.org/grpc/internal/transport/http2_client.go
+++ b/vendor/google.golang.org/grpc/internal/transport/http2_client.go
@@ -38,8 +38,11 @@ import (
 	"google.golang.org/grpc/credentials"
 	"google.golang.org/grpc/internal/channelz"
 	icredentials "google.golang.org/grpc/internal/credentials"
+	"google.golang.org/grpc/internal/grpclog"
+	"google.golang.org/grpc/internal/grpcsync"
 	"google.golang.org/grpc/internal/grpcutil"
 	imetadata "google.golang.org/grpc/internal/metadata"
+	istatus "google.golang.org/grpc/internal/status"
 	"google.golang.org/grpc/internal/syscall"
 	"google.golang.org/grpc/internal/transport/networktype"
 	"google.golang.org/grpc/keepalive"
@@ -57,11 +60,15 @@ var clientConnectionCounter uint64
 
 // http2Client implements the ClientTransport interface with HTTP2.
 type http2Client struct {
-	lastRead   int64 // Keep this field 64-bit aligned. Accessed atomically.
-	ctx        context.Context
-	cancel     context.CancelFunc
-	ctxDone    <-chan struct{} // Cache the ctx.Done() chan.
-	userAgent  string
+	lastRead  int64 // Keep this field 64-bit aligned. Accessed atomically.
+	ctx       context.Context
+	cancel    context.CancelFunc
+	ctxDone   <-chan struct{} // Cache the ctx.Done() chan.
+	userAgent string
+	// address contains the resolver returned address for this transport.
+	// If the `ServerName` field is set, it takes precedence over `CallHdr.Host`
+	// passed to `NewStream`, when determining the :authority header.
+	address    resolver.Address
 	md         metadata.MD
 	conn       net.Conn // underlying communication channel
 	loopy      *loopyWriter
@@ -99,16 +106,13 @@ type http2Client struct {
 	maxSendHeaderListSize *uint32
 
 	bdpEst *bdpEstimator
-	// onPrefaceReceipt is a callback that client transport calls upon
-	// receiving server preface to signal that a succefull HTTP2
-	// connection was established.
-	onPrefaceReceipt func()
 
 	maxConcurrentStreams  uint32
 	streamQuota           int64
 	streamsQuotaAvailable chan struct{}
 	waitingStreams        uint32
 	nextID                uint32
+	registeredCompressors string
 
 	// Do not access controlBuf with mu held.
 	mu            sync.Mutex // guard the following variables
@@ -137,12 +141,12 @@ type http2Client struct {
 	channelzID *channelz.Identifier
 	czData     *channelzData
 
-	onGoAway func(GoAwayReason)
-	onClose  func()
+	onClose func(GoAwayReason)
 
 	bufferPool *bufferPool
 
 	connectionID uint64
+	logger       *grpclog.PrefixLogger
 }
 
 func dial(ctx context.Context, fn func(context.Context, string) (net.Conn, error), addr resolver.Address, useProxy bool, grpcUA string) (net.Conn, error) {
@@ -194,7 +198,7 @@ func isTemporary(err error) bool {
 // newHTTP2Client constructs a connected ClientTransport to addr based on HTTP2
 // and starts to receive messages on it. Non-nil error returns if construction
 // fails.
-func newHTTP2Client(connectCtx, ctx context.Context, addr resolver.Address, opts ConnectOptions, onPrefaceReceipt func(), onGoAway func(GoAwayReason), onClose func()) (_ *http2Client, err error) {
+func newHTTP2Client(connectCtx, ctx context.Context, addr resolver.Address, opts ConnectOptions, onClose func(GoAwayReason)) (_ *http2Client, err error) {
 	scheme := "http"
 	ctx, cancel := context.WithCancel(ctx)
 	defer func() {
@@ -214,14 +218,40 @@ func newHTTP2Client(connectCtx, ctx context.Context, addr resolver.Address, opts
 		if opts.FailOnNonTempDialError {
 			return nil, connectionErrorf(isTemporary(err), err, "transport: error while dialing: %v", err)
 		}
-		return nil, connectionErrorf(true, err, "transport: Error while dialing %v", err)
+		return nil, connectionErrorf(true, err, "transport: Error while dialing: %v", err)
 	}
+
 	// Any further errors will close the underlying connection
 	defer func(conn net.Conn) {
 		if err != nil {
 			conn.Close()
 		}
 	}(conn)
+
+	// The following defer and goroutine monitor the connectCtx for cancelation
+	// and deadline.  On context expiration, the connection is hard closed and
+	// this function will naturally fail as a result.  Otherwise, the defer
+	// waits for the goroutine to exit to prevent the context from being
+	// monitored (and to prevent the connection from ever being closed) after
+	// returning from this function.
+	ctxMonitorDone := grpcsync.NewEvent()
+	newClientCtx, newClientDone := context.WithCancel(connectCtx)
+	defer func() {
+		newClientDone()         // Awaken the goroutine below if connectCtx hasn't expired.
+		<-ctxMonitorDone.Done() // Wait for the goroutine below to exit.
+	}()
+	go func(conn net.Conn) {
+		defer ctxMonitorDone.Fire() // Signal this goroutine has exited.
+		<-newClientCtx.Done()       // Block until connectCtx expires or the defer above executes.
+		if err := connectCtx.Err(); err != nil {
+			// connectCtx expired before exiting the function.  Hard close the connection.
+			if logger.V(logLevel) {
+				logger.Infof("Aborting due to connect deadline expiring: %v", err)
+			}
+			conn.Close()
+		}
+	}(conn)
+
 	kp := opts.KeepaliveParams
 	// Validate keepalive parameters.
 	if kp.Time == 0 {
@@ -253,15 +283,7 @@ func newHTTP2Client(connectCtx, ctx context.Context, addr resolver.Address, opts
 		}
 	}
 	if transportCreds != nil {
-		rawConn := conn
-		// Pull the deadline from the connectCtx, which will be used for
-		// timeouts in the authentication protocol handshake. Can ignore the
-		// boolean as the deadline will return the zero value, which will make
-		// the conn not timeout on I/O operations.
-		deadline, _ := connectCtx.Deadline()
-		rawConn.SetDeadline(deadline)
-		conn, authInfo, err = transportCreds.ClientHandshake(connectCtx, addr.ServerName, rawConn)
-		rawConn.SetDeadline(time.Time{})
+		conn, authInfo, err = transportCreds.ClientHandshake(connectCtx, addr.ServerName, conn)
 		if err != nil {
 			return nil, connectionErrorf(isTemporary(err), err, "transport: authentication handshake failed: %v", err)
 		}
@@ -299,6 +321,8 @@ func newHTTP2Client(connectCtx, ctx context.Context, addr resolver.Address, opts
 		ctxDone:               ctx.Done(), // Cache Done chan.
 		cancel:                cancel,
 		userAgent:             opts.UserAgent,
+		registeredCompressors: grpcutil.RegisteredCompressors(),
+		address:               addr,
 		conn:                  conn,
 		remoteAddr:            conn.RemoteAddr(),
 		localAddr:             conn.LocalAddr(),
@@ -315,17 +339,18 @@ func newHTTP2Client(connectCtx, ctx context.Context, addr resolver.Address, opts
 		kp:                    kp,
 		statsHandlers:         opts.StatsHandlers,
 		initialWindowSize:     initialWindowSize,
-		onPrefaceReceipt:      onPrefaceReceipt,
 		nextID:                1,
 		maxConcurrentStreams:  defaultMaxStreamsClient,
 		streamQuota:           defaultMaxStreamsClient,
 		streamsQuotaAvailable: make(chan struct{}, 1),
 		czData:                new(channelzData),
-		onGoAway:              onGoAway,
-		onClose:               onClose,
 		keepaliveEnabled:      keepaliveEnabled,
 		bufferPool:            newBufferPool(),
+		onClose:               onClose,
 	}
+	t.logger = prefixLoggerForClientTransport(t)
+	// Add peer information to the http2client context.
+	t.ctx = peer.NewContext(t.ctx, t.getPeer())
 
 	if md, ok := addr.Metadata.(*metadata.MD); ok {
 		t.md = *md
@@ -361,21 +386,32 @@ func newHTTP2Client(connectCtx, ctx context.Context, addr resolver.Address, opts
 		t.kpDormancyCond = sync.NewCond(&t.mu)
 		go t.keepalive()
 	}
-	// Start the reader goroutine for incoming message. Each transport has
-	// a dedicated goroutine which reads HTTP2 frame from network. Then it
-	// dispatches the frame to the corresponding stream entity.
-	go t.reader()
+
+	// Start the reader goroutine for incoming messages. Each transport has a
+	// dedicated goroutine which reads HTTP2 frames from the network. Then it
+	// dispatches the frame to the corresponding stream entity.  When the
+	// server preface is received, readerErrCh is closed.  If an error occurs
+	// first, an error is pushed to the channel.  This must be checked before
+	// returning from this function.
+	readerErrCh := make(chan error, 1)
+	go t.reader(readerErrCh)
+	defer func() {
+		if err == nil {
+			err = <-readerErrCh
+		}
+		if err != nil {
+			t.Close(err)
+		}
+	}()
 
 	// Send connection preface to server.
 	n, err := t.conn.Write(clientPreface)
 	if err != nil {
 		err = connectionErrorf(true, err, "transport: failed to write client preface: %v", err)
-		t.Close(err)
 		return nil, err
 	}
 	if n != len(clientPreface) {
 		err = connectionErrorf(true, nil, "transport: preface mismatch, wrote %d bytes; want %d", n, len(clientPreface))
-		t.Close(err)
 		return nil, err
 	}
 	var ss []http2.Setting
@@ -395,14 +431,12 @@ func newHTTP2Client(connectCtx, ctx context.Context, addr resolver.Address, opts
 	err = t.framer.fr.WriteSettings(ss...)
 	if err != nil {
 		err = connectionErrorf(true, err, "transport: failed to write initial settings frame: %v", err)
-		t.Close(err)
 		return nil, err
 	}
 	// Adjust the connection flow control window if needed.
 	if delta := uint32(icwz - defaultWindowSize); delta > 0 {
 		if err := t.framer.fr.WriteWindowUpdate(0, delta); err != nil {
 			err = connectionErrorf(true, err, "transport: failed to write window update: %v", err)
-			t.Close(err)
 			return nil, err
 		}
 	}
@@ -413,17 +447,8 @@ func newHTTP2Client(connectCtx, ctx context.Context, addr resolver.Address, opts
 		return nil, err
 	}
 	go func() {
-		t.loopy = newLoopyWriter(clientSide, t.framer, t.controlBuf, t.bdpEst)
-		err := t.loopy.run()
-		if err != nil {
-			if logger.V(logLevel) {
-				logger.Errorf("transport: loopyWriter.run returning. Err: %v", err)
-			}
-		}
-		// Do not close the transport.  Let reader goroutine handle it since
-		// there might be data in the buffers.
-		t.conn.Close()
-		t.controlBuf.finish()
+		t.loopy = newLoopyWriter(clientSide, t.framer, t.controlBuf, t.bdpEst, t.conn, t.logger)
+		t.loopy.run()
 		close(t.writerDone)
 	}()
 	return t, nil
@@ -469,7 +494,7 @@ func (t *http2Client) newStream(ctx context.Context, callHdr *CallHdr) *Stream {
 func (t *http2Client) getPeer() *peer.Peer {
 	return &peer.Peer{
 		Addr:     t.remoteAddr,
-		AuthInfo: t.authInfo,
+		AuthInfo: t.authInfo, // Can be nil
 	}
 }
 
@@ -505,9 +530,22 @@ func (t *http2Client) createHeaderFields(ctx context.Context, callHdr *CallHdr)
 		headerFields = append(headerFields, hpack.HeaderField{Name: "grpc-previous-rpc-attempts", Value: strconv.Itoa(callHdr.PreviousAttempts)})
 	}
 
+	registeredCompressors := t.registeredCompressors
 	if callHdr.SendCompress != "" {
 		headerFields = append(headerFields, hpack.HeaderField{Name: "grpc-encoding", Value: callHdr.SendCompress})
-		headerFields = append(headerFields, hpack.HeaderField{Name: "grpc-accept-encoding", Value: callHdr.SendCompress})
+		// Include the outgoing compressor name when compressor is not registered
+		// via encoding.RegisterCompressor. This is possible when client uses
+		// WithCompressor dial option.
+		if !grpcutil.IsCompressorNameRegistered(callHdr.SendCompress) {
+			if registeredCompressors != "" {
+				registeredCompressors += ","
+			}
+			registeredCompressors += callHdr.SendCompress
+		}
+	}
+
+	if registeredCompressors != "" {
+		headerFields = append(headerFields, hpack.HeaderField{Name: "grpc-accept-encoding", Value: registeredCompressors})
 	}
 	if dl, ok := ctx.Deadline(); ok {
 		// Send out timeout regardless its value. The server can detect timeout context by itself.
@@ -587,7 +625,11 @@ func (t *http2Client) getTrAuthData(ctx context.Context, audience string) (map[s
 	for _, c := range t.perRPCCreds {
 		data, err := c.GetRequestMetadata(ctx, audience)
 		if err != nil {
-			if _, ok := status.FromError(err); ok {
+			if st, ok := status.FromError(err); ok {
+				// Restrict the code to the list allowed by gRFC A54.
+				if istatus.IsRestrictedControlPlaneCode(st) {
+					err = status.Errorf(codes.Internal, "transport: received per-RPC creds error with illegal status: %v", err)
+				}
 				return nil, err
 			}
 
@@ -616,7 +658,14 @@ func (t *http2Client) getCallAuthData(ctx context.Context, audience string, call
 		}
 		data, err := callCreds.GetRequestMetadata(ctx, audience)
 		if err != nil {
-			return nil, status.Errorf(codes.Internal, "transport: %v", err)
+			if st, ok := status.FromError(err); ok {
+				// Restrict the code to the list allowed by gRFC A54.
+				if istatus.IsRestrictedControlPlaneCode(st) {
+					err = status.Errorf(codes.Internal, "transport: received per-RPC creds error with illegal status: %v", err)
+				}
+				return nil, err
+			}
+			return nil, status.Errorf(codes.Internal, "transport: per-RPC creds failed due to error: %v", err)
 		}
 		callAuthData = make(map[string]string, len(data))
 		for k, v := range data {
@@ -632,13 +681,13 @@ func (t *http2Client) getCallAuthData(ctx context.Context, audience string, call
 // NewStream errors result in transparent retry, as they mean nothing went onto
 // the wire.  However, there are two notable exceptions:
 //
-// 1. If the stream headers violate the max header list size allowed by the
-//    server.  It's possible this could succeed on another transport, even if
-//    it's unlikely, but do not transparently retry.
-// 2. If the credentials errored when requesting their headers.  In this case,
-//    it's possible a retry can fix the problem, but indefinitely transparently
-//    retrying is not appropriate as it is likely the credentials, if they can
-//    eventually succeed, would need I/O to do so.
+//  1. If the stream headers violate the max header list size allowed by the
+//     server.  It's possible this could succeed on another transport, even if
+//     it's unlikely, but do not transparently retry.
+//  2. If the credentials errored when requesting their headers.  In this case,
+//     it's possible a retry can fix the problem, but indefinitely transparently
+//     retrying is not appropriate as it is likely the credentials, if they can
+//     eventually succeed, would need I/O to do so.
 type NewStreamError struct {
 	Err error
 
@@ -653,6 +702,18 @@ func (e NewStreamError) Error() string {
 // streams.  All non-nil errors returned will be *NewStreamError.
 func (t *http2Client) NewStream(ctx context.Context, callHdr *CallHdr) (*Stream, error) {
 	ctx = peer.NewContext(ctx, t.getPeer())
+
+	// ServerName field of the resolver returned address takes precedence over
+	// Host field of CallHdr to determine the :authority header. This is because,
+	// the ServerName field takes precedence for server authentication during
+	// TLS handshake, and the :authority header should match the value used
+	// for server authentication.
+	if t.address.ServerName != "" {
+		newCallHdr := *callHdr
+		newCallHdr.Host = t.address.ServerName
+		callHdr = &newCallHdr
+	}
+
 	headerFields, err := t.createHeaderFields(ctx, callHdr)
 	if err != nil {
 		return nil, &NewStreamError{Err: err, AllowTransparentRetry: false}
@@ -677,15 +738,12 @@ func (t *http2Client) NewStream(ctx context.Context, callHdr *CallHdr) (*Stream,
 		endStream: false,
 		initStream: func(id uint32) error {
 			t.mu.Lock()
-			if state := t.state; state != reachable {
+			// TODO: handle transport closure in loopy instead and remove this
+			// initStream is never called when transport is draining.
+			if t.state == closing {
 				t.mu.Unlock()
-				// Do a quick cleanup.
-				err := error(errStreamDrain)
-				if state == closing {
-					err = ErrConnClosing
-				}
-				cleanup(err)
-				return err
+				cleanup(ErrConnClosing)
+				return ErrConnClosing
 			}
 			if channelz.IsOn() {
 				atomic.AddInt64(&t.czData.streamsStarted, 1)
@@ -703,6 +761,7 @@ func (t *http2Client) NewStream(ctx context.Context, callHdr *CallHdr) (*Stream,
 	}
 	firstTry := true
 	var ch chan struct{}
+	transportDrainRequired := false
 	checkForStreamQuota := func(it interface{}) bool {
 		if t.streamQuota <= 0 { // Can go negative if server decreases it.
 			if firstTry {
@@ -718,10 +777,15 @@ func (t *http2Client) NewStream(ctx context.Context, callHdr *CallHdr) (*Stream,
 		h := it.(*headerFrame)
 		h.streamID = t.nextID
 		t.nextID += 2
+
+		// Drain client transport if nextID > MaxStreamID which signals gRPC that
+		// the connection is closed and a new one must be created for subsequent RPCs.
+		transportDrainRequired = t.nextID > MaxStreamID
+
 		s.id = h.streamID
 		s.fc = &inFlow{limit: uint32(t.initialWindowSize)}
 		t.mu.Lock()
-		if t.activeStreams == nil { // Can be niled from Close().
+		if t.state == draining || t.activeStreams == nil { // Can be niled from Close().
 			t.mu.Unlock()
 			return false // Don't create a stream if the transport is already closed.
 		}
@@ -797,6 +861,12 @@ func (t *http2Client) NewStream(ctx context.Context, callHdr *CallHdr) (*Stream,
 			sh.HandleRPC(s.ctx, outHeader)
 		}
 	}
+	if transportDrainRequired {
+		if t.logger.V(logLevel) {
+			t.logger.Infof("Draining transport: t.nextID > MaxStreamID")
+		}
+		t.GracefulClose()
+	}
 	return s, nil
 }
 
@@ -878,20 +948,21 @@ func (t *http2Client) closeStream(s *Stream, err error, rst bool, rstCode http2.
 // Close kicks off the shutdown process of the transport. This should be called
 // only once on a transport. Once it is called, the transport should not be
 // accessed any more.
-//
-// This method blocks until the addrConn that initiated this transport is
-// re-connected. This happens because t.onClose() begins reconnect logic at the
-// addrConn level and blocks until the addrConn is successfully connected.
 func (t *http2Client) Close(err error) {
 	t.mu.Lock()
-	// Make sure we only Close once.
+	// Make sure we only close once.
 	if t.state == closing {
 		t.mu.Unlock()
 		return
 	}
-	// Call t.onClose before setting the state to closing to prevent the client
-	// from attempting to create new streams ASAP.
-	t.onClose()
+	if t.logger.V(logLevel) {
+		t.logger.Infof("Closing: %v", err)
+	}
+	// Call t.onClose ASAP to prevent the client from attempting to create new
+	// streams.
+	if t.state != draining {
+		t.onClose(GoAwayInvalid)
+	}
 	t.state = closing
 	streams := t.activeStreams
 	t.activeStreams = nil
@@ -941,11 +1012,15 @@ func (t *http2Client) GracefulClose() {
 		t.mu.Unlock()
 		return
 	}
+	if t.logger.V(logLevel) {
+		t.logger.Infof("GracefulClose called")
+	}
+	t.onClose(GoAwayInvalid)
 	t.state = draining
 	active := len(t.activeStreams)
 	t.mu.Unlock()
 	if active == 0 {
-		t.Close(ErrConnClosing)
+		t.Close(connectionErrorf(true, nil, "no active streams left to process while draining"))
 		return
 	}
 	t.controlBuf.put(&incomingGoAway{})
@@ -1102,8 +1177,8 @@ func (t *http2Client) handleRSTStream(f *http2.RSTStreamFrame) {
 	}
 	statusCode, ok := http2ErrConvTab[f.ErrCode]
 	if !ok {
-		if logger.V(logLevel) {
-			logger.Warningf("transport: http2Client.handleRSTStream found no mapped gRPC status for the received http2 error %v", f.ErrCode)
+		if t.logger.V(logLevel) {
+			t.logger.Infof("Received a RST_STREAM frame with code %q, but found no mapped gRPC status", f.ErrCode)
 		}
 		statusCode = codes.Unknown
 	}
@@ -1185,10 +1260,12 @@ func (t *http2Client) handleGoAway(f *http2.GoAwayFrame) {
 		t.mu.Unlock()
 		return
 	}
-	if f.ErrCode == http2.ErrCodeEnhanceYourCalm {
-		if logger.V(logLevel) {
-			logger.Infof("Client received GoAway with http2.ErrCodeEnhanceYourCalm.")
-		}
+	if f.ErrCode == http2.ErrCodeEnhanceYourCalm && string(f.DebugData()) == "too_many_pings" {
+		// When a client receives a GOAWAY with error code ENHANCE_YOUR_CALM and debug
+		// data equal to ASCII "too_many_pings", it should log the occurrence at a log level that is
+		// enabled by default and double the configure KEEPALIVE_TIME used for new connections
+		// on that channel.
+		logger.Errorf("Client received GoAway with error code ENHANCE_YOUR_CALM and debug data equal to ASCII \"too_many_pings\".")
 	}
 	id := f.LastStreamID
 	if id > 0 && id%2 == 0 {
@@ -1221,8 +1298,10 @@ func (t *http2Client) handleGoAway(f *http2.GoAwayFrame) {
 		// Notify the clientconn about the GOAWAY before we set the state to
 		// draining, to allow the client to stop attempting to create streams
 		// before disallowing new streams on this connection.
-		t.onGoAway(t.goAwayReason)
-		t.state = draining
+		if t.state != draining {
+			t.onClose(t.goAwayReason)
+			t.state = draining
+		}
 	}
 	// All streams with IDs greater than the GoAwayId
 	// and smaller than the previous GoAway ID should be killed.
@@ -1230,24 +1309,35 @@ func (t *http2Client) handleGoAway(f *http2.GoAwayFrame) {
 	if upperLimit == 0 { // This is the first GoAway Frame.
 		upperLimit = math.MaxUint32 // Kill all streams after the GoAway ID.
 	}
+
+	t.prevGoAwayID = id
+	if len(t.activeStreams) == 0 {
+		t.mu.Unlock()
+		t.Close(connectionErrorf(true, nil, "received goaway and there are no active streams"))
+		return
+	}
+
+	streamsToClose := make([]*Stream, 0)
 	for streamID, stream := range t.activeStreams {
 		if streamID > id && streamID <= upperLimit {
 			// The stream was unprocessed by the server.
-			atomic.StoreUint32(&stream.unprocessed, 1)
-			t.closeStream(stream, errStreamDrain, false, http2.ErrCodeNo, statusGoAway, nil, false)
+			if streamID > id && streamID <= upperLimit {
+				atomic.StoreUint32(&stream.unprocessed, 1)
+				streamsToClose = append(streamsToClose, stream)
+			}
 		}
 	}
-	t.prevGoAwayID = id
-	active := len(t.activeStreams)
 	t.mu.Unlock()
-	if active == 0 {
-		t.Close(connectionErrorf(true, nil, "received goaway and there are no active streams"))
+	// Called outside t.mu because closeStream can take controlBuf's mu, which
+	// could induce deadlock and is not allowed.
+	for _, stream := range streamsToClose {
+		t.closeStream(stream, errStreamDrain, false, http2.ErrCodeNo, statusGoAway, nil, false)
 	}
 }
 
 // setGoAwayReason sets the value of t.goAwayReason based
 // on the GoAway frame received.
-// It expects a lock on transport's mutext to be held by
+// It expects a lock on transport's mutex to be held by
 // the caller.
 func (t *http2Client) setGoAwayReason(f *http2.GoAwayFrame) {
 	t.goAwayReason = GoAwayNoReason
@@ -1469,33 +1559,35 @@ func (t *http2Client) operateHeaders(frame *http2.MetaHeadersFrame) {
 	t.closeStream(s, io.EOF, rst, http2.ErrCodeNo, statusGen, mdata, true)
 }
 
-// reader runs as a separate goroutine in charge of reading data from network
-// connection.
-//
-// TODO(zhaoq): currently one reader per transport. Investigate whether this is
-// optimal.
-// TODO(zhaoq): Check the validity of the incoming frame sequence.
-func (t *http2Client) reader() {
-	defer close(t.readerDone)
-	// Check the validity of server preface.
+// readServerPreface reads and handles the initial settings frame from the
+// server.
+func (t *http2Client) readServerPreface() error {
 	frame, err := t.framer.fr.ReadFrame()
 	if err != nil {
-		err = connectionErrorf(true, err, "error reading server preface: %v", err)
-		t.Close(err) // this kicks off resetTransport, so must be last before return
-		return
-	}
-	t.conn.SetReadDeadline(time.Time{}) // reset deadline once we get the settings frame (we didn't time out, yay!)
-	if t.keepaliveEnabled {
-		atomic.StoreInt64(&t.lastRead, time.Now().UnixNano())
+		return connectionErrorf(true, err, "error reading server preface: %v", err)
 	}
 	sf, ok := frame.(*http2.SettingsFrame)
 	if !ok {
-		// this kicks off resetTransport, so must be last before return
-		t.Close(connectionErrorf(true, nil, "initial http2 frame from server is not a settings frame: %T", frame))
-		return
+		return connectionErrorf(true, nil, "initial http2 frame from server is not a settings frame: %T", frame)
 	}
-	t.onPrefaceReceipt()
 	t.handleSettings(sf, true)
+	return nil
+}
+
+// reader verifies the server preface and reads all subsequent data from
+// network connection.  If the server preface is not read successfully, an
+// error is pushed to errCh; otherwise errCh is closed with no error.
+func (t *http2Client) reader(errCh chan<- error) {
+	defer close(t.readerDone)
+
+	if err := t.readServerPreface(); err != nil {
+		errCh <- err
+		return
+	}
+	close(errCh)
+	if t.keepaliveEnabled {
+		atomic.StoreInt64(&t.lastRead, time.Now().UnixNano())
+	}
 
 	// loop to keep reading incoming messages on this transport.
 	for {
@@ -1698,3 +1790,9 @@ func (t *http2Client) getOutFlowWindow() int64 {
 		return -2
 	}
 }
+
+func (t *http2Client) stateForTesting() transportState {
+	t.mu.Lock()
+	defer t.mu.Unlock()
+	return t.state
+}
diff --git a/vendor/google.golang.org/grpc/internal/transport/http2_server.go b/vendor/google.golang.org/grpc/internal/transport/http2_server.go
index 28bcba0a3..ec4eef213 100644
--- a/vendor/google.golang.org/grpc/internal/transport/http2_server.go
+++ b/vendor/google.golang.org/grpc/internal/transport/http2_server.go
@@ -21,6 +21,7 @@ package transport
 import (
 	"bytes"
 	"context"
+	"errors"
 	"fmt"
 	"io"
 	"math"
@@ -34,13 +35,16 @@ import (
 	"github.com/golang/protobuf/proto"
 	"golang.org/x/net/http2"
 	"golang.org/x/net/http2/hpack"
+	"google.golang.org/grpc/internal/grpclog"
 	"google.golang.org/grpc/internal/grpcutil"
+	"google.golang.org/grpc/internal/pretty"
 	"google.golang.org/grpc/internal/syscall"
 
 	"google.golang.org/grpc/codes"
 	"google.golang.org/grpc/credentials"
 	"google.golang.org/grpc/internal/channelz"
 	"google.golang.org/grpc/internal/grpcrand"
+	"google.golang.org/grpc/internal/grpcsync"
 	"google.golang.org/grpc/keepalive"
 	"google.golang.org/grpc/metadata"
 	"google.golang.org/grpc/peer"
@@ -101,13 +105,13 @@ type http2Server struct {
 
 	mu sync.Mutex // guard the following
 
-	// drainChan is initialized when Drain() is called the first time.
-	// After which the server writes out the first GoAway(with ID 2^31-1) frame.
-	// Then an independent goroutine will be launched to later send the second GoAway.
-	// During this time we don't want to write another first GoAway(with ID 2^31 -1) frame.
-	// Thus call to Drain() will be a no-op if drainChan is already initialized since draining is
-	// already underway.
-	drainChan     chan struct{}
+	// drainEvent is initialized when Drain() is called the first time. After
+	// which the server writes out the first GoAway(with ID 2^31-1) frame. Then
+	// an independent goroutine will be launched to later send the second
+	// GoAway. During this time we don't want to write another first GoAway(with
+	// ID 2^31 -1) frame. Thus call to Drain() will be a no-op if drainEvent is
+	// already initialized since draining is already underway.
+	drainEvent    *grpcsync.Event
 	state         transportState
 	activeStreams map[uint32]*Stream
 	// idle is the time instant when the connection went idle.
@@ -127,6 +131,8 @@ type http2Server struct {
 	// This lock may not be taken if mu is already held.
 	maxStreamMu sync.Mutex
 	maxStreamID uint32 // max stream ID ever seen
+
+	logger *grpclog.PrefixLogger
 }
 
 // NewServerTransport creates a http2 transport with conn and configuration
@@ -165,15 +171,10 @@ func NewServerTransport(conn net.Conn, config *ServerConfig) (_ ServerTransport,
 		ID:  http2.SettingMaxFrameSize,
 		Val: http2MaxFrameLen,
 	}}
-	// TODO(zhaoq): Have a better way to signal "no limit" because 0 is
-	// permitted in the HTTP2 spec.
-	maxStreams := config.MaxStreams
-	if maxStreams == 0 {
-		maxStreams = math.MaxUint32
-	} else {
+	if config.MaxStreams != math.MaxUint32 {
 		isettings = append(isettings, http2.Setting{
 			ID:  http2.SettingMaxConcurrentStreams,
-			Val: maxStreams,
+			Val: config.MaxStreams,
 		})
 	}
 	dynamicWindow := true
@@ -252,7 +253,7 @@ func NewServerTransport(conn net.Conn, config *ServerConfig) (_ ServerTransport,
 		framer:            framer,
 		readerDone:        make(chan struct{}),
 		writerDone:        make(chan struct{}),
-		maxStreams:        maxStreams,
+		maxStreams:        config.MaxStreams,
 		inTapHandle:       config.InTapHandle,
 		fc:                &trInFlow{limit: uint32(icwz)},
 		state:             reachable,
@@ -265,6 +266,10 @@ func NewServerTransport(conn net.Conn, config *ServerConfig) (_ ServerTransport,
 		czData:            new(channelzData),
 		bufferPool:        newBufferPool(),
 	}
+	t.logger = prefixLoggerForServerTransport(t)
+	// Add peer information to the http2server context.
+	t.ctx = peer.NewContext(t.ctx, t.getPeer())
+
 	t.controlBuf = newControlBuffer(t.done)
 	if dynamicWindow {
 		t.bdpEst = &bdpEstimator{
@@ -290,7 +295,7 @@ func NewServerTransport(conn net.Conn, config *ServerConfig) (_ ServerTransport,
 
 	defer func() {
 		if err != nil {
-			t.Close()
+			t.Close(err)
 		}
 	}()
 
@@ -326,23 +331,18 @@ func NewServerTransport(conn net.Conn, config *ServerConfig) (_ ServerTransport,
 	t.handleSettings(sf)
 
 	go func() {
-		t.loopy = newLoopyWriter(serverSide, t.framer, t.controlBuf, t.bdpEst)
+		t.loopy = newLoopyWriter(serverSide, t.framer, t.controlBuf, t.bdpEst, t.conn, t.logger)
 		t.loopy.ssGoAwayHandler = t.outgoingGoAwayHandler
-		if err := t.loopy.run(); err != nil {
-			if logger.V(logLevel) {
-				logger.Errorf("transport: loopyWriter.run returning. Err: %v", err)
-			}
-		}
-		t.conn.Close()
-		t.controlBuf.finish()
+		t.loopy.run()
 		close(t.writerDone)
 	}()
 	go t.keepalive()
 	return t, nil
 }
 
-// operateHeader takes action on the decoded headers.
-func (t *http2Server) operateHeaders(frame *http2.MetaHeadersFrame, handle func(*Stream), traceCtx func(context.Context, string) context.Context) (fatal bool) {
+// operateHeaders takes action on the decoded headers. Returns an error if fatal
+// error encountered and transport needs to close, otherwise returns nil.
+func (t *http2Server) operateHeaders(frame *http2.MetaHeadersFrame, handle func(*Stream), traceCtx func(context.Context, string) context.Context) error {
 	// Acquire max stream ID lock for entire duration
 	t.maxStreamMu.Lock()
 	defer t.maxStreamMu.Unlock()
@@ -358,15 +358,12 @@ func (t *http2Server) operateHeaders(frame *http2.MetaHeadersFrame, handle func(
 			rstCode:  http2.ErrCodeFrameSize,
 			onWrite:  func() {},
 		})
-		return false
+		return nil
 	}
 
 	if streamID%2 != 1 || streamID <= t.maxStreamID {
 		// illegal gRPC stream id.
-		if logger.V(logLevel) {
-			logger.Errorf("transport: http2Server.HandleStreams received an illegal stream id: %v", streamID)
-		}
-		return true
+		return fmt.Errorf("received an illegal stream id: %v. headers frame: %+v", streamID, frame)
 	}
 	t.maxStreamID = streamID
 
@@ -378,13 +375,14 @@ func (t *http2Server) operateHeaders(frame *http2.MetaHeadersFrame, handle func(
 		fc:  &inFlow{limit: uint32(t.initialWindowSize)},
 	}
 	var (
-		// If a gRPC Response-Headers has already been received, then it means
-		// that the peer is speaking gRPC and we are in gRPC mode.
-		isGRPC     = false
-		mdata      = make(map[string][]string)
-		httpMethod string
-		// headerError is set if an error is encountered while parsing the headers
-		headerError bool
+		// if false, content-type was missing or invalid
+		isGRPC      = false
+		contentType = ""
+		mdata       = make(metadata.MD, len(frame.Fields))
+		httpMethod  string
+		// these are set if an error is encountered while parsing the headers
+		protocolError bool
+		headerError   *status.Status
 
 		timeoutSet bool
 		timeout    time.Duration
@@ -395,11 +393,23 @@ func (t *http2Server) operateHeaders(frame *http2.MetaHeadersFrame, handle func(
 		case "content-type":
 			contentSubtype, validContentType := grpcutil.ContentSubtype(hf.Value)
 			if !validContentType {
+				contentType = hf.Value
 				break
 			}
 			mdata[hf.Name] = append(mdata[hf.Name], hf.Value)
 			s.contentSubtype = contentSubtype
 			isGRPC = true
+
+		case "grpc-accept-encoding":
+			mdata[hf.Name] = append(mdata[hf.Name], hf.Value)
+			if hf.Value == "" {
+				continue
+			}
+			compressors := hf.Value
+			if s.clientAdvertisedCompressors != "" {
+				compressors = s.clientAdvertisedCompressors + "," + compressors
+			}
+			s.clientAdvertisedCompressors = compressors
 		case "grpc-encoding":
 			s.recvCompress = hf.Value
 		case ":method":
@@ -410,23 +420,23 @@ func (t *http2Server) operateHeaders(frame *http2.MetaHeadersFrame, handle func(
 			timeoutSet = true
 			var err error
 			if timeout, err = decodeTimeout(hf.Value); err != nil {
-				headerError = true
+				headerError = status.Newf(codes.Internal, "malformed grpc-timeout: %v", err)
 			}
 		// "Transports must consider requests containing the Connection header
 		// as malformed." - A41
 		case "connection":
-			if logger.V(logLevel) {
-				logger.Errorf("transport: http2Server.operateHeaders parsed a :connection header which makes a request malformed as per the HTTP/2 spec")
+			if t.logger.V(logLevel) {
+				t.logger.Infof("Received a HEADERS frame with a :connection header which makes the request malformed, as per the HTTP/2 spec")
 			}
-			headerError = true
+			protocolError = true
 		default:
 			if isReservedHeader(hf.Name) && !isWhitelistedHeader(hf.Name) {
 				break
 			}
 			v, err := decodeMetadataHeader(hf.Name, hf.Value)
 			if err != nil {
-				headerError = true
-				logger.Warningf("Failed to decode metadata header (%q, %q): %v", hf.Name, hf.Value, err)
+				headerError = status.Newf(codes.Internal, "malformed binary metadata %q in header %q: %v", hf.Value, hf.Name, err)
+				t.logger.Warningf("Failed to decode metadata header (%q, %q): %v", hf.Name, hf.Value, err)
 				break
 			}
 			mdata[hf.Name] = append(mdata[hf.Name], v)
@@ -440,27 +450,47 @@ func (t *http2Server) operateHeaders(frame *http2.MetaHeadersFrame, handle func(
 	// error, this takes precedence over a client not speaking gRPC.
 	if len(mdata[":authority"]) > 1 || len(mdata["host"]) > 1 {
 		errMsg := fmt.Sprintf("num values of :authority: %v, num values of host: %v, both must only have 1 value as per HTTP/2 spec", len(mdata[":authority"]), len(mdata["host"]))
-		if logger.V(logLevel) {
-			logger.Errorf("transport: %v", errMsg)
+		if t.logger.V(logLevel) {
+			t.logger.Infof("Aborting the stream early: %v", errMsg)
 		}
 		t.controlBuf.put(&earlyAbortStream{
-			httpStatus:     400,
+			httpStatus:     http.StatusBadRequest,
 			streamID:       streamID,
 			contentSubtype: s.contentSubtype,
 			status:         status.New(codes.Internal, errMsg),
 			rst:            !frame.StreamEnded(),
 		})
-		return false
+		return nil
 	}
 
-	if !isGRPC || headerError {
+	if protocolError {
 		t.controlBuf.put(&cleanupStream{
 			streamID: streamID,
 			rst:      true,
 			rstCode:  http2.ErrCodeProtocol,
 			onWrite:  func() {},
 		})
-		return false
+		return nil
+	}
+	if !isGRPC {
+		t.controlBuf.put(&earlyAbortStream{
+			httpStatus:     http.StatusUnsupportedMediaType,
+			streamID:       streamID,
+			contentSubtype: s.contentSubtype,
+			status:         status.Newf(codes.InvalidArgument, "invalid gRPC request content-type %q", contentType),
+			rst:            !frame.StreamEnded(),
+		})
+		return nil
+	}
+	if headerError != nil {
+		t.controlBuf.put(&earlyAbortStream{
+			httpStatus:     http.StatusBadRequest,
+			streamID:       streamID,
+			contentSubtype: s.contentSubtype,
+			status:         headerError,
+			rst:            !frame.StreamEnded(),
+		})
+		return nil
 	}
 
 	// "If :authority is missing, Host must be renamed to :authority." - A41
@@ -485,14 +515,7 @@ func (t *http2Server) operateHeaders(frame *http2.MetaHeadersFrame, handle func(
 	} else {
 		s.ctx, s.cancel = context.WithCancel(t.ctx)
 	}
-	pr := &peer.Peer{
-		Addr: t.remoteAddr,
-	}
-	// Attach Auth info if there is any.
-	if t.authInfo != nil {
-		pr.AuthInfo = t.authInfo
-	}
-	s.ctx = peer.NewContext(s.ctx, pr)
+
 	// Attach the received metadata to the context.
 	if len(mdata) > 0 {
 		s.ctx = metadata.NewIncomingContext(s.ctx, mdata)
@@ -507,7 +530,7 @@ func (t *http2Server) operateHeaders(frame *http2.MetaHeadersFrame, handle func(
 	if t.state != reachable {
 		t.mu.Unlock()
 		s.cancel()
-		return false
+		return nil
 	}
 	if uint32(len(t.activeStreams)) >= t.maxStreams {
 		t.mu.Unlock()
@@ -518,13 +541,13 @@ func (t *http2Server) operateHeaders(frame *http2.MetaHeadersFrame, handle func(
 			onWrite:  func() {},
 		})
 		s.cancel()
-		return false
+		return nil
 	}
 	if httpMethod != http.MethodPost {
 		t.mu.Unlock()
-		errMsg := fmt.Sprintf("http2Server.operateHeaders parsed a :method field: %v which should be POST", httpMethod)
-		if logger.V(logLevel) {
-			logger.Infof("transport: %v", errMsg)
+		errMsg := fmt.Sprintf("Received a HEADERS frame with :method %q which should be POST", httpMethod)
+		if t.logger.V(logLevel) {
+			t.logger.Infof("Aborting the stream early: %v", errMsg)
 		}
 		t.controlBuf.put(&earlyAbortStream{
 			httpStatus:     405,
@@ -534,14 +557,14 @@ func (t *http2Server) operateHeaders(frame *http2.MetaHeadersFrame, handle func(
 			rst:            !frame.StreamEnded(),
 		})
 		s.cancel()
-		return false
+		return nil
 	}
 	if t.inTapHandle != nil {
 		var err error
 		if s.ctx, err = t.inTapHandle(s.ctx, &tap.Info{FullMethodName: s.method}); err != nil {
 			t.mu.Unlock()
-			if logger.V(logLevel) {
-				logger.Infof("transport: http2Server.operateHeaders got an error from InTapHandle: %v", err)
+			if t.logger.V(logLevel) {
+				t.logger.Infof("Aborting the stream early due to InTapHandle failure: %v", err)
 			}
 			stat, ok := status.FromError(err)
 			if !ok {
@@ -554,7 +577,7 @@ func (t *http2Server) operateHeaders(frame *http2.MetaHeadersFrame, handle func(
 				status:         stat,
 				rst:            !frame.StreamEnded(),
 			})
-			return false
+			return nil
 		}
 	}
 	t.activeStreams[streamID] = s
@@ -578,7 +601,7 @@ func (t *http2Server) operateHeaders(frame *http2.MetaHeadersFrame, handle func(
 			LocalAddr:   t.localAddr,
 			Compression: s.recvCompress,
 			WireLength:  int(frame.Header().Length),
-			Header:      metadata.MD(mdata).Copy(),
+			Header:      mdata.Copy(),
 		}
 		sh.HandleRPC(s.ctx, inHeader)
 	}
@@ -601,7 +624,7 @@ func (t *http2Server) operateHeaders(frame *http2.MetaHeadersFrame, handle func(
 		wq:       s.wq,
 	})
 	handle(s)
-	return false
+	return nil
 }
 
 // HandleStreams receives incoming streams using the given handler. This is
@@ -615,8 +638,8 @@ func (t *http2Server) HandleStreams(handle func(*Stream), traceCtx func(context.
 		atomic.StoreInt64(&t.lastRead, time.Now().UnixNano())
 		if err != nil {
 			if se, ok := err.(http2.StreamError); ok {
-				if logger.V(logLevel) {
-					logger.Warningf("transport: http2Server.HandleStreams encountered http2.StreamError: %v", se)
+				if t.logger.V(logLevel) {
+					t.logger.Warningf("Encountered http2.StreamError: %v", se)
 				}
 				t.mu.Lock()
 				s := t.activeStreams[se.StreamID]
@@ -634,19 +657,16 @@ func (t *http2Server) HandleStreams(handle func(*Stream), traceCtx func(context.
 				continue
 			}
 			if err == io.EOF || err == io.ErrUnexpectedEOF {
-				t.Close()
+				t.Close(err)
 				return
 			}
-			if logger.V(logLevel) {
-				logger.Warningf("transport: http2Server.HandleStreams failed to read frame: %v", err)
-			}
-			t.Close()
+			t.Close(err)
 			return
 		}
 		switch frame := frame.(type) {
 		case *http2.MetaHeadersFrame:
-			if t.operateHeaders(frame, handle, traceCtx) {
-				t.Close()
+			if err := t.operateHeaders(frame, handle, traceCtx); err != nil {
+				t.Close(err)
 				break
 			}
 		case *http2.DataFrame:
@@ -662,8 +682,8 @@ func (t *http2Server) HandleStreams(handle func(*Stream), traceCtx func(context.
 		case *http2.GoAwayFrame:
 			// TODO: Handle GoAway from the client appropriately.
 		default:
-			if logger.V(logLevel) {
-				logger.Errorf("transport: http2Server.HandleStreams found unhandled frame type %v.", frame)
+			if t.logger.V(logLevel) {
+				t.logger.Infof("Received unsupported frame type %T", frame)
 			}
 		}
 	}
@@ -847,8 +867,8 @@ const (
 
 func (t *http2Server) handlePing(f *http2.PingFrame) {
 	if f.IsAck() {
-		if f.Data == goAwayPing.data && t.drainChan != nil {
-			close(t.drainChan)
+		if f.Data == goAwayPing.data && t.drainEvent != nil {
+			t.drainEvent.Fire()
 			return
 		}
 		// Maybe it's a BDP ping.
@@ -890,10 +910,7 @@ func (t *http2Server) handlePing(f *http2.PingFrame) {
 
 	if t.pingStrikes > maxPingStrikes {
 		// Send goaway and close the connection.
-		if logger.V(logLevel) {
-			logger.Errorf("transport: Got too many pings from the client, closing the connection.")
-		}
-		t.controlBuf.put(&goAway{code: http2.ErrCodeEnhanceYourCalm, debugData: []byte("too_many_pings"), closeConn: true})
+		t.controlBuf.put(&goAway{code: http2.ErrCodeEnhanceYourCalm, debugData: []byte("too_many_pings"), closeConn: errors.New("got too many pings from the client")})
 	}
 }
 
@@ -925,8 +942,8 @@ func (t *http2Server) checkForHeaderListSize(it interface{}) bool {
 	var sz int64
 	for _, f := range hdrFrame.hf {
 		if sz += int64(f.Size()); sz > int64(*t.maxSendHeaderListSize) {
-			if logger.V(logLevel) {
-				logger.Errorf("header list size to send violates the maximum size (%d bytes) set by client", *t.maxSendHeaderListSize)
+			if t.logger.V(logLevel) {
+				t.logger.Infof("Header list size to send violates the maximum size (%d bytes) set by client", *t.maxSendHeaderListSize)
 			}
 			return false
 		}
@@ -1039,7 +1056,7 @@ func (t *http2Server) WriteStatus(s *Stream, st *status.Status) error {
 		stBytes, err := proto.Marshal(p)
 		if err != nil {
 			// TODO: return error instead, when callers are able to handle it.
-			logger.Errorf("transport: failed to marshal rpc status: %v, error: %v", p, err)
+			t.logger.Errorf("Failed to marshal rpc status: %s, error: %v", pretty.ToJSON(p), err)
 		} else {
 			headerFields = append(headerFields, hpack.HeaderField{Name: "grpc-status-details-bin", Value: encodeBinHeader(stBytes)})
 		}
@@ -1144,20 +1161,20 @@ func (t *http2Server) keepalive() {
 			if val <= 0 {
 				// The connection has been idle for a duration of keepalive.MaxConnectionIdle or more.
 				// Gracefully close the connection.
-				t.Drain()
+				t.Drain("max_idle")
 				return
 			}
 			idleTimer.Reset(val)
 		case <-ageTimer.C:
-			t.Drain()
+			t.Drain("max_age")
 			ageTimer.Reset(t.kp.MaxConnectionAgeGrace)
 			select {
 			case <-ageTimer.C:
 				// Close the connection after grace period.
-				if logger.V(logLevel) {
-					logger.Infof("transport: closing server transport due to maximum connection age.")
+				if t.logger.V(logLevel) {
+					t.logger.Infof("Closing server transport due to maximum connection age")
 				}
-				t.Close()
+				t.controlBuf.put(closeConnection{})
 			case <-t.done:
 			}
 			return
@@ -1173,10 +1190,7 @@ func (t *http2Server) keepalive() {
 				continue
 			}
 			if outstandingPing && kpTimeoutLeft <= 0 {
-				if logger.V(logLevel) {
-					logger.Infof("transport: closing server transport due to idleness.")
-				}
-				t.Close()
+				t.Close(fmt.Errorf("keepalive ping not acked within timeout %s", t.kp.Time))
 				return
 			}
 			if !outstandingPing {
@@ -1203,20 +1217,23 @@ func (t *http2Server) keepalive() {
 // Close starts shutting down the http2Server transport.
 // TODO(zhaoq): Now the destruction is not blocked on any pending streams. This
 // could cause some resource issue. Revisit this later.
-func (t *http2Server) Close() {
+func (t *http2Server) Close(err error) {
 	t.mu.Lock()
 	if t.state == closing {
 		t.mu.Unlock()
 		return
 	}
+	if t.logger.V(logLevel) {
+		t.logger.Infof("Closing: %v", err)
+	}
 	t.state = closing
 	streams := t.activeStreams
 	t.activeStreams = nil
 	t.mu.Unlock()
 	t.controlBuf.finish()
 	close(t.done)
-	if err := t.conn.Close(); err != nil && logger.V(logLevel) {
-		logger.Infof("transport: error closing conn during Close: %v", err)
+	if err := t.conn.Close(); err != nil && t.logger.V(logLevel) {
+		t.logger.Infof("Error closing underlying net.Conn during Close: %v", err)
 	}
 	channelz.RemoveEntry(t.channelzID)
 	// Cancel all active streams.
@@ -1296,14 +1313,14 @@ func (t *http2Server) RemoteAddr() net.Addr {
 	return t.remoteAddr
 }
 
-func (t *http2Server) Drain() {
+func (t *http2Server) Drain(debugData string) {
 	t.mu.Lock()
 	defer t.mu.Unlock()
-	if t.drainChan != nil {
+	if t.drainEvent != nil {
 		return
 	}
-	t.drainChan = make(chan struct{})
-	t.controlBuf.put(&goAway{code: http2.ErrCodeNo, debugData: []byte{}, headsUp: true})
+	t.drainEvent = grpcsync.NewEvent()
+	t.controlBuf.put(&goAway{code: http2.ErrCodeNo, debugData: []byte(debugData), headsUp: true})
 }
 
 var goAwayPing = &ping{data: [8]byte{1, 6, 1, 8, 0, 3, 3, 9}}
@@ -1323,19 +1340,17 @@ func (t *http2Server) outgoingGoAwayHandler(g *goAway) (bool, error) {
 		// Stop accepting more streams now.
 		t.state = draining
 		sid := t.maxStreamID
+		retErr := g.closeConn
 		if len(t.activeStreams) == 0 {
-			g.closeConn = true
+			retErr = errors.New("second GOAWAY written and no active streams left to process")
 		}
 		t.mu.Unlock()
 		t.maxStreamMu.Unlock()
 		if err := t.framer.fr.WriteGoAway(sid, g.code, g.debugData); err != nil {
 			return false, err
 		}
-		if g.closeConn {
-			// Abruptly close the connection following the GoAway (via
-			// loopywriter).  But flush out what's inside the buffer first.
-			t.framer.writer.Flush()
-			return false, fmt.Errorf("transport: Connection closing")
+		if retErr != nil {
+			return false, retErr
 		}
 		return true, nil
 	}
@@ -1347,7 +1362,7 @@ func (t *http2Server) outgoingGoAwayHandler(g *goAway) (bool, error) {
 	// originated before the GoAway reaches the client.
 	// After getting the ack or timer expiration send out another GoAway this
 	// time with an ID of the max stream server intends to process.
-	if err := t.framer.fr.WriteGoAway(math.MaxUint32, http2.ErrCodeNo, []byte{}); err != nil {
+	if err := t.framer.fr.WriteGoAway(math.MaxUint32, http2.ErrCodeNo, g.debugData); err != nil {
 		return false, err
 	}
 	if err := t.framer.fr.WritePing(false, goAwayPing.data); err != nil {
@@ -1357,7 +1372,7 @@ func (t *http2Server) outgoingGoAwayHandler(g *goAway) (bool, error) {
 		timer := time.NewTimer(time.Minute)
 		defer timer.Stop()
 		select {
-		case <-t.drainChan:
+		case <-t.drainEvent.Done():
 		case <-timer.C:
 		case <-t.done:
 			return
@@ -1416,6 +1431,13 @@ func (t *http2Server) getOutFlowWindow() int64 {
 	}
 }
 
+func (t *http2Server) getPeer() *peer.Peer {
+	return &peer.Peer{
+		Addr:     t.remoteAddr,
+		AuthInfo: t.authInfo, // Can be nil
+	}
+}
+
 func getJitter(v time.Duration) time.Duration {
 	if v == infinity {
 		return 0
diff --git a/vendor/google.golang.org/grpc/internal/transport/http_util.go b/vendor/google.golang.org/grpc/internal/transport/http_util.go
index 56e95788d..19cbb18f5 100644
--- a/vendor/google.golang.org/grpc/internal/transport/http_util.go
+++ b/vendor/google.golang.org/grpc/internal/transport/http_util.go
@@ -20,8 +20,8 @@ package transport
 
 import (
 	"bufio"
-	"bytes"
 	"encoding/base64"
+	"errors"
 	"fmt"
 	"io"
 	"math"
@@ -38,14 +38,13 @@ import (
 	"golang.org/x/net/http2/hpack"
 	spb "google.golang.org/genproto/googleapis/rpc/status"
 	"google.golang.org/grpc/codes"
-	"google.golang.org/grpc/grpclog"
 	"google.golang.org/grpc/status"
 )
 
 const (
 	// http2MaxFrameLen specifies the max length of a HTTP2 frame.
 	http2MaxFrameLen = 16384 // 16KB frame
-	// http://http2.github.io/http2-spec/#SettingValues
+	// https://httpwg.org/specs/rfc7540.html#SettingValues
 	http2InitHeaderTableSize = 4096
 )
 
@@ -86,7 +85,6 @@ var (
 		// 504 Gateway timeout - UNAVAILABLE.
 		http.StatusGatewayTimeout: codes.Unavailable,
 	}
-	logger = grpclog.Component("transport")
 )
 
 // isReservedHeader checks whether hdr belongs to HTTP2 headers
@@ -251,13 +249,13 @@ func encodeGrpcMessage(msg string) string {
 }
 
 func encodeGrpcMessageUnchecked(msg string) string {
-	var buf bytes.Buffer
+	var sb strings.Builder
 	for len(msg) > 0 {
 		r, size := utf8.DecodeRuneInString(msg)
 		for _, b := range []byte(string(r)) {
 			if size > 1 {
 				// If size > 1, r is not ascii. Always do percent encoding.
-				buf.WriteString(fmt.Sprintf("%%%02X", b))
+				fmt.Fprintf(&sb, "%%%02X", b)
 				continue
 			}
 
@@ -266,14 +264,14 @@ func encodeGrpcMessageUnchecked(msg string) string {
 			//
 			// fmt.Sprintf("%%%02X", utf8.RuneError) gives "%FFFD".
 			if b >= spaceByte && b <= tildeByte && b != percentByte {
-				buf.WriteByte(b)
+				sb.WriteByte(b)
 			} else {
-				buf.WriteString(fmt.Sprintf("%%%02X", b))
+				fmt.Fprintf(&sb, "%%%02X", b)
 			}
 		}
 		msg = msg[size:]
 	}
-	return buf.String()
+	return sb.String()
 }
 
 // decodeGrpcMessage decodes the msg encoded by encodeGrpcMessage.
@@ -291,23 +289,23 @@ func decodeGrpcMessage(msg string) string {
 }
 
 func decodeGrpcMessageUnchecked(msg string) string {
-	var buf bytes.Buffer
+	var sb strings.Builder
 	lenMsg := len(msg)
 	for i := 0; i < lenMsg; i++ {
 		c := msg[i]
 		if c == percentByte && i+2 < lenMsg {
 			parsed, err := strconv.ParseUint(msg[i+1:i+3], 16, 8)
 			if err != nil {
-				buf.WriteByte(c)
+				sb.WriteByte(c)
 			} else {
-				buf.WriteByte(byte(parsed))
+				sb.WriteByte(byte(parsed))
 				i += 2
 			}
 		} else {
-			buf.WriteByte(c)
+			sb.WriteByte(c)
 		}
 	}
-	return buf.String()
+	return sb.String()
 }
 
 type bufWriter struct {
@@ -331,7 +329,8 @@ func (w *bufWriter) Write(b []byte) (n int, err error) {
 		return 0, w.err
 	}
 	if w.batchSize == 0 { // Buffer has been disabled.
-		return w.conn.Write(b)
+		n, err = w.conn.Write(b)
+		return n, toIOError(err)
 	}
 	for len(b) > 0 {
 		nn := copy(w.buf[w.offset:], b)
@@ -353,10 +352,30 @@ func (w *bufWriter) Flush() error {
 		return nil
 	}
 	_, w.err = w.conn.Write(w.buf[:w.offset])
+	w.err = toIOError(w.err)
 	w.offset = 0
 	return w.err
 }
 
+type ioError struct {
+	error
+}
+
+func (i ioError) Unwrap() error {
+	return i.error
+}
+
+func isIOError(err error) bool {
+	return errors.As(err, &ioError{})
+}
+
+func toIOError(err error) error {
+	if err == nil {
+		return nil
+	}
+	return ioError{error: err}
+}
+
 type framer struct {
 	writer *bufWriter
 	fr     *http2.Framer
diff --git a/vendor/google.golang.org/grpc/internal/transport/logging.go b/vendor/google.golang.org/grpc/internal/transport/logging.go
new file mode 100644
index 000000000..42ed2b07a
--- /dev/null
+++ b/vendor/google.golang.org/grpc/internal/transport/logging.go
@@ -0,0 +1,40 @@
+/*
+ *
+ * Copyright 2023 gRPC authors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ *
+ */
+
+package transport
+
+import (
+	"fmt"
+
+	"google.golang.org/grpc/grpclog"
+	internalgrpclog "google.golang.org/grpc/internal/grpclog"
+)
+
+var logger = grpclog.Component("transport")
+
+func prefixLoggerForServerTransport(p *http2Server) *internalgrpclog.PrefixLogger {
+	return internalgrpclog.NewPrefixLogger(logger, fmt.Sprintf("[server-transport %p] ", p))
+}
+
+func prefixLoggerForServerHandlerTransport(p *serverHandlerTransport) *internalgrpclog.PrefixLogger {
+	return internalgrpclog.NewPrefixLogger(logger, fmt.Sprintf("[server-handler-transport %p] ", p))
+}
+
+func prefixLoggerForClientTransport(p *http2Client) *internalgrpclog.PrefixLogger {
+	return internalgrpclog.NewPrefixLogger(logger, fmt.Sprintf("[client-transport %p] ", p))
+}
diff --git a/vendor/google.golang.org/grpc/internal/transport/transport.go b/vendor/google.golang.org/grpc/internal/transport/transport.go
index 6c3ba8515..aa1c89659 100644
--- a/vendor/google.golang.org/grpc/internal/transport/transport.go
+++ b/vendor/google.golang.org/grpc/internal/transport/transport.go
@@ -43,6 +43,10 @@ import (
 	"google.golang.org/grpc/tap"
 )
 
+// ErrNoHeaders is used as a signal that a trailers only response was received,
+// and is not a real error.
+var ErrNoHeaders = errors.New("stream has no headers")
+
 const logLevel = 2
 
 type bufferPool struct {
@@ -253,6 +257,9 @@ type Stream struct {
 	fc           *inFlow
 	wq           *writeQuota
 
+	// Holds compressor names passed in grpc-accept-encoding metadata from the
+	// client. This is empty for the client side stream.
+	clientAdvertisedCompressors string
 	// Callback to state application's intentions to read data. This
 	// is used to adjust flow control, if needed.
 	requestRead func(int)
@@ -341,8 +348,24 @@ func (s *Stream) RecvCompress() string {
 }
 
 // SetSendCompress sets the compression algorithm to the stream.
-func (s *Stream) SetSendCompress(str string) {
-	s.sendCompress = str
+func (s *Stream) SetSendCompress(name string) error {
+	if s.isHeaderSent() || s.getState() == streamDone {
+		return errors.New("transport: set send compressor called after headers sent or stream done")
+	}
+
+	s.sendCompress = name
+	return nil
+}
+
+// SendCompress returns the send compressor name.
+func (s *Stream) SendCompress() string {
+	return s.sendCompress
+}
+
+// ClientAdvertisedCompressors returns the compressor names advertised by the
+// client via grpc-accept-encoding header.
+func (s *Stream) ClientAdvertisedCompressors() string {
+	return s.clientAdvertisedCompressors
 }
 
 // Done returns a channel which is closed when it receives the final status
@@ -366,9 +389,15 @@ func (s *Stream) Header() (metadata.MD, error) {
 		return s.header.Copy(), nil
 	}
 	s.waitOnHeader()
+
 	if !s.headerValid {
 		return nil, s.status.Err()
 	}
+
+	if s.noHeaders {
+		return nil, ErrNoHeaders
+	}
+
 	return s.header.Copy(), nil
 }
 
@@ -573,8 +602,8 @@ type ConnectOptions struct {
 
 // NewClientTransport establishes the transport with the required ConnectOptions
 // and returns it to the caller.
-func NewClientTransport(connectCtx, ctx context.Context, addr resolver.Address, opts ConnectOptions, onPrefaceReceipt func(), onGoAway func(GoAwayReason), onClose func()) (ClientTransport, error) {
-	return newHTTP2Client(connectCtx, ctx, addr, opts, onPrefaceReceipt, onGoAway, onClose)
+func NewClientTransport(connectCtx, ctx context.Context, addr resolver.Address, opts ConnectOptions, onClose func(GoAwayReason)) (ClientTransport, error) {
+	return newHTTP2Client(connectCtx, ctx, addr, opts, onClose)
 }
 
 // Options provides additional hints and information for message
@@ -691,13 +720,13 @@ type ServerTransport interface {
 	// Close tears down the transport. Once it is called, the transport
 	// should not be accessed any more. All the pending streams and their
 	// handlers will be terminated asynchronously.
-	Close()
+	Close(err error)
 
 	// RemoteAddr returns the remote network address.
 	RemoteAddr() net.Addr
 
 	// Drain notifies the client this ServerTransport stops accepting new RPCs.
-	Drain()
+	Drain(debugData string)
 
 	// IncrMsgSent increments the number of message sent through this transport.
 	IncrMsgSent()
diff --git a/vendor/google.golang.org/grpc/metadata/metadata.go b/vendor/google.golang.org/grpc/metadata/metadata.go
index 8e0f6abe8..a2cdcaf12 100644
--- a/vendor/google.golang.org/grpc/metadata/metadata.go
+++ b/vendor/google.golang.org/grpc/metadata/metadata.go
@@ -41,16 +41,17 @@ type MD map[string][]string
 // New creates an MD from a given key-value map.
 //
 // Only the following ASCII characters are allowed in keys:
-//  - digits: 0-9
-//  - uppercase letters: A-Z (normalized to lower)
-//  - lowercase letters: a-z
-//  - special characters: -_.
+//   - digits: 0-9
+//   - uppercase letters: A-Z (normalized to lower)
+//   - lowercase letters: a-z
+//   - special characters: -_.
+//
 // Uppercase letters are automatically converted to lowercase.
 //
 // Keys beginning with "grpc-" are reserved for grpc-internal use only and may
 // result in errors if set in metadata.
 func New(m map[string]string) MD {
-	md := MD{}
+	md := make(MD, len(m))
 	for k, val := range m {
 		key := strings.ToLower(k)
 		md[key] = append(md[key], val)
@@ -62,10 +63,11 @@ func New(m map[string]string) MD {
 // Pairs panics if len(kv) is odd.
 //
 // Only the following ASCII characters are allowed in keys:
-//  - digits: 0-9
-//  - uppercase letters: A-Z (normalized to lower)
-//  - lowercase letters: a-z
-//  - special characters: -_.
+//   - digits: 0-9
+//   - uppercase letters: A-Z (normalized to lower)
+//   - lowercase letters: a-z
+//   - special characters: -_.
+//
 // Uppercase letters are automatically converted to lowercase.
 //
 // Keys beginning with "grpc-" are reserved for grpc-internal use only and may
@@ -74,7 +76,7 @@ func Pairs(kv ...string) MD {
 	if len(kv)%2 == 1 {
 		panic(fmt.Sprintf("metadata: Pairs got the odd number of input pairs for metadata: %d", len(kv)))
 	}
-	md := MD{}
+	md := make(MD, len(kv)/2)
 	for i := 0; i < len(kv); i += 2 {
 		key := strings.ToLower(kv[i])
 		md[key] = append(md[key], kv[i+1])
@@ -89,7 +91,11 @@ func (md MD) Len() int {
 
 // Copy returns a copy of md.
 func (md MD) Copy() MD {
-	return Join(md)
+	out := make(MD, len(md))
+	for k, v := range md {
+		out[k] = copyOf(v)
+	}
+	return out
 }
 
 // Get obtains the values for a given key.
@@ -169,8 +175,11 @@ func AppendToOutgoingContext(ctx context.Context, kv ...string) context.Context
 	md, _ := ctx.Value(mdOutgoingKey{}).(rawMD)
 	added := make([][]string, len(md.added)+1)
 	copy(added, md.added)
-	added[len(added)-1] = make([]string, len(kv))
-	copy(added[len(added)-1], kv)
+	kvCopy := make([]string, 0, len(kv))
+	for i := 0; i < len(kv); i += 2 {
+		kvCopy = append(kvCopy, strings.ToLower(kv[i]), kv[i+1])
+	}
+	added[len(added)-1] = kvCopy
 	return context.WithValue(ctx, mdOutgoingKey{}, rawMD{md: md.md, added: added})
 }
 
@@ -182,19 +191,51 @@ func FromIncomingContext(ctx context.Context) (MD, bool) {
 	if !ok {
 		return nil, false
 	}
-	out := MD{}
+	out := make(MD, len(md))
 	for k, v := range md {
 		// We need to manually convert all keys to lower case, because MD is a
 		// map, and there's no guarantee that the MD attached to the context is
 		// created using our helper functions.
 		key := strings.ToLower(k)
-		s := make([]string, len(v))
-		copy(s, v)
-		out[key] = s
+		out[key] = copyOf(v)
 	}
 	return out, true
 }
 
+// ValueFromIncomingContext returns the metadata value corresponding to the metadata
+// key from the incoming metadata if it exists. Key must be lower-case.
+//
+// # Experimental
+//
+// Notice: This API is EXPERIMENTAL and may be changed or removed in a
+// later release.
+func ValueFromIncomingContext(ctx context.Context, key string) []string {
+	md, ok := ctx.Value(mdIncomingKey{}).(MD)
+	if !ok {
+		return nil
+	}
+
+	if v, ok := md[key]; ok {
+		return copyOf(v)
+	}
+	for k, v := range md {
+		// We need to manually convert all keys to lower case, because MD is a
+		// map, and there's no guarantee that the MD attached to the context is
+		// created using our helper functions.
+		if strings.ToLower(k) == key {
+			return copyOf(v)
+		}
+	}
+	return nil
+}
+
+// the returned slice must not be modified in place
+func copyOf(v []string) []string {
+	vals := make([]string, len(v))
+	copy(vals, v)
+	return vals
+}
+
 // FromOutgoingContextRaw returns the un-merged, intermediary contents of rawMD.
 //
 // Remember to perform strings.ToLower on the keys, for both the returned MD (MD
@@ -222,15 +263,18 @@ func FromOutgoingContext(ctx context.Context) (MD, bool) {
 		return nil, false
 	}
 
-	out := MD{}
+	mdSize := len(raw.md)
+	for i := range raw.added {
+		mdSize += len(raw.added[i]) / 2
+	}
+
+	out := make(MD, mdSize)
 	for k, v := range raw.md {
 		// We need to manually convert all keys to lower case, because MD is a
 		// map, and there's no guarantee that the MD attached to the context is
 		// created using our helper functions.
 		key := strings.ToLower(k)
-		s := make([]string, len(v))
-		copy(s, v)
-		out[key] = s
+		out[key] = copyOf(v)
 	}
 	for _, added := range raw.added {
 		if len(added)%2 == 1 {
diff --git a/vendor/google.golang.org/grpc/picker_wrapper.go b/vendor/google.golang.org/grpc/picker_wrapper.go
index 843633c91..02f975951 100644
--- a/vendor/google.golang.org/grpc/picker_wrapper.go
+++ b/vendor/google.golang.org/grpc/picker_wrapper.go
@@ -26,6 +26,7 @@ import (
 	"google.golang.org/grpc/balancer"
 	"google.golang.org/grpc/codes"
 	"google.golang.org/grpc/internal/channelz"
+	istatus "google.golang.org/grpc/internal/status"
 	"google.golang.org/grpc/internal/transport"
 	"google.golang.org/grpc/status"
 )
@@ -35,6 +36,7 @@ import (
 type pickerWrapper struct {
 	mu         sync.Mutex
 	done       bool
+	idle       bool
 	blockingCh chan struct{}
 	picker     balancer.Picker
 }
@@ -46,7 +48,11 @@ func newPickerWrapper() *pickerWrapper {
 // updatePicker is called by UpdateBalancerState. It unblocks all blocked pick.
 func (pw *pickerWrapper) updatePicker(p balancer.Picker) {
 	pw.mu.Lock()
-	if pw.done {
+	if pw.done || pw.idle {
+		// There is a small window where a picker update from the LB policy can
+		// race with the channel going to idle mode. If the picker is idle here,
+		// it is because the channel asked it to do so, and therefore it is sage
+		// to ignore the update from the LB policy.
 		pw.mu.Unlock()
 		return
 	}
@@ -57,12 +63,16 @@ func (pw *pickerWrapper) updatePicker(p balancer.Picker) {
 	pw.mu.Unlock()
 }
 
-func doneChannelzWrapper(acw *acBalancerWrapper, done func(balancer.DoneInfo)) func(balancer.DoneInfo) {
-	acw.mu.Lock()
-	ac := acw.ac
-	acw.mu.Unlock()
+// doneChannelzWrapper performs the following:
+//   - increments the calls started channelz counter
+//   - wraps the done function in the passed in result to increment the calls
+//     failed or calls succeeded channelz counter before invoking the actual
+//     done function.
+func doneChannelzWrapper(acbw *acBalancerWrapper, result *balancer.PickResult) {
+	ac := acbw.ac
 	ac.incrCallsStarted()
-	return func(b balancer.DoneInfo) {
+	done := result.Done
+	result.Done = func(b balancer.DoneInfo) {
 		if b.Err != nil && b.Err != io.EOF {
 			ac.incrCallsFailed()
 		} else {
@@ -81,7 +91,7 @@ func doneChannelzWrapper(acw *acBalancerWrapper, done func(balancer.DoneInfo)) f
 // - the current picker returns other errors and failfast is false.
 // - the subConn returned by the current picker is not READY
 // When one of these situations happens, pick blocks until the picker gets updated.
-func (pw *pickerWrapper) pick(ctx context.Context, failfast bool, info balancer.PickInfo) (transport.ClientTransport, func(balancer.DoneInfo), error) {
+func (pw *pickerWrapper) pick(ctx context.Context, failfast bool, info balancer.PickInfo) (transport.ClientTransport, balancer.PickResult, error) {
 	var ch chan struct{}
 
 	var lastPickErr error
@@ -89,7 +99,7 @@ func (pw *pickerWrapper) pick(ctx context.Context, failfast bool, info balancer.
 		pw.mu.Lock()
 		if pw.done {
 			pw.mu.Unlock()
-			return nil, nil, ErrClientConnClosing
+			return nil, balancer.PickResult{}, ErrClientConnClosing
 		}
 
 		if pw.picker == nil {
@@ -110,9 +120,9 @@ func (pw *pickerWrapper) pick(ctx context.Context, failfast bool, info balancer.
 				}
 				switch ctx.Err() {
 				case context.DeadlineExceeded:
-					return nil, nil, status.Error(codes.DeadlineExceeded, errStr)
+					return nil, balancer.PickResult{}, status.Error(codes.DeadlineExceeded, errStr)
 				case context.Canceled:
-					return nil, nil, status.Error(codes.Canceled, errStr)
+					return nil, balancer.PickResult{}, status.Error(codes.Canceled, errStr)
 				}
 			case <-ch:
 			}
@@ -124,14 +134,17 @@ func (pw *pickerWrapper) pick(ctx context.Context, failfast bool, info balancer.
 		pw.mu.Unlock()
 
 		pickResult, err := p.Pick(info)
-
 		if err != nil {
 			if err == balancer.ErrNoSubConnAvailable {
 				continue
 			}
-			if _, ok := status.FromError(err); ok {
+			if st, ok := status.FromError(err); ok {
 				// Status error: end the RPC unconditionally with this status.
-				return nil, nil, dropError{error: err}
+				// First restrict the code to the list allowed by gRFC A54.
+				if istatus.IsRestrictedControlPlaneCode(st) {
+					err = status.Errorf(codes.Internal, "received picker error with illegal status: %v", err)
+				}
+				return nil, balancer.PickResult{}, dropError{error: err}
 			}
 			// For all other errors, wait for ready RPCs should block and other
 			// RPCs should fail with unavailable.
@@ -139,19 +152,20 @@ func (pw *pickerWrapper) pick(ctx context.Context, failfast bool, info balancer.
 				lastPickErr = err
 				continue
 			}
-			return nil, nil, status.Error(codes.Unavailable, err.Error())
+			return nil, balancer.PickResult{}, status.Error(codes.Unavailable, err.Error())
 		}
 
-		acw, ok := pickResult.SubConn.(*acBalancerWrapper)
+		acbw, ok := pickResult.SubConn.(*acBalancerWrapper)
 		if !ok {
 			logger.Errorf("subconn returned from pick is type %T, not *acBalancerWrapper", pickResult.SubConn)
 			continue
 		}
-		if t := acw.getAddrConn().getReadyTransport(); t != nil {
+		if t := acbw.ac.getReadyTransport(); t != nil {
 			if channelz.IsOn() {
-				return t, doneChannelzWrapper(acw, pickResult.Done), nil
+				doneChannelzWrapper(acbw, &pickResult)
+				return t, pickResult, nil
 			}
-			return t, pickResult.Done, nil
+			return t, pickResult, nil
 		}
 		if pickResult.Done != nil {
 			// Calling done with nil error, no bytes sent and no bytes received.
@@ -176,6 +190,25 @@ func (pw *pickerWrapper) close() {
 	close(pw.blockingCh)
 }
 
+func (pw *pickerWrapper) enterIdleMode() {
+	pw.mu.Lock()
+	defer pw.mu.Unlock()
+	if pw.done {
+		return
+	}
+	pw.idle = true
+}
+
+func (pw *pickerWrapper) exitIdleMode() {
+	pw.mu.Lock()
+	defer pw.mu.Unlock()
+	if pw.done {
+		return
+	}
+	pw.blockingCh = make(chan struct{})
+	pw.idle = false
+}
+
 // dropError is a wrapper error that indicates the LB policy wishes to drop the
 // RPC and not retry it.
 type dropError struct {
diff --git a/vendor/google.golang.org/grpc/pickfirst.go b/vendor/google.golang.org/grpc/pickfirst.go
index fb7a99e0a..abe266b02 100644
--- a/vendor/google.golang.org/grpc/pickfirst.go
+++ b/vendor/google.golang.org/grpc/pickfirst.go
@@ -19,11 +19,15 @@
 package grpc
 
 import (
+	"encoding/json"
 	"errors"
 	"fmt"
 
 	"google.golang.org/grpc/balancer"
 	"google.golang.org/grpc/connectivity"
+	"google.golang.org/grpc/internal/envconfig"
+	"google.golang.org/grpc/internal/grpcrand"
+	"google.golang.org/grpc/serviceconfig"
 )
 
 // PickFirstBalancerName is the name of the pick_first balancer.
@@ -43,15 +47,33 @@ func (*pickfirstBuilder) Name() string {
 	return PickFirstBalancerName
 }
 
+type pfConfig struct {
+	serviceconfig.LoadBalancingConfig `json:"-"`
+
+	// If set to true, instructs the LB policy to shuffle the order of the list
+	// of addresses received from the name resolver before attempting to
+	// connect to them.
+	ShuffleAddressList bool `json:"shuffleAddressList"`
+}
+
+func (*pickfirstBuilder) ParseConfig(js json.RawMessage) (serviceconfig.LoadBalancingConfig, error) {
+	cfg := &pfConfig{}
+	if err := json.Unmarshal(js, cfg); err != nil {
+		return nil, fmt.Errorf("pickfirst: unable to unmarshal LB policy config: %s, error: %v", string(js), err)
+	}
+	return cfg, nil
+}
+
 type pickfirstBalancer struct {
 	state   connectivity.State
 	cc      balancer.ClientConn
 	subConn balancer.SubConn
+	cfg     *pfConfig
 }
 
 func (b *pickfirstBalancer) ResolverError(err error) {
 	if logger.V(2) {
-		logger.Infof("pickfirstBalancer: ResolverError called with error %v", err)
+		logger.Infof("pickfirstBalancer: ResolverError called with error: %v", err)
 	}
 	if b.subConn == nil {
 		b.state = connectivity.TransientFailure
@@ -69,7 +91,8 @@ func (b *pickfirstBalancer) ResolverError(err error) {
 }
 
 func (b *pickfirstBalancer) UpdateClientConnState(state balancer.ClientConnState) error {
-	if len(state.ResolverState.Addresses) == 0 {
+	addrs := state.ResolverState.Addresses
+	if len(addrs) == 0 {
 		// The resolver reported an empty address list. Treat it like an error by
 		// calling b.ResolverError.
 		if b.subConn != nil {
@@ -82,12 +105,23 @@ func (b *pickfirstBalancer) UpdateClientConnState(state balancer.ClientConnState
 		return balancer.ErrBadResolverState
 	}
 
+	if state.BalancerConfig != nil {
+		cfg, ok := state.BalancerConfig.(*pfConfig)
+		if !ok {
+			return fmt.Errorf("pickfirstBalancer: received nil or illegal BalancerConfig (type %T): %v", state.BalancerConfig, state.BalancerConfig)
+		}
+		b.cfg = cfg
+	}
+
+	if envconfig.PickFirstLBConfig && b.cfg != nil && b.cfg.ShuffleAddressList {
+		grpcrand.Shuffle(len(addrs), func(i, j int) { addrs[i], addrs[j] = addrs[j], addrs[i] })
+	}
 	if b.subConn != nil {
-		b.cc.UpdateAddresses(b.subConn, state.ResolverState.Addresses)
+		b.cc.UpdateAddresses(b.subConn, addrs)
 		return nil
 	}
 
-	subConn, err := b.cc.NewSubConn(state.ResolverState.Addresses, balancer.NewSubConnOptions{})
+	subConn, err := b.cc.NewSubConn(addrs, balancer.NewSubConnOptions{})
 	if err != nil {
 		if logger.V(2) {
 			logger.Errorf("pickfirstBalancer: failed to NewSubConn: %v", err)
@@ -102,8 +136,8 @@ func (b *pickfirstBalancer) UpdateClientConnState(state balancer.ClientConnState
 	b.subConn = subConn
 	b.state = connectivity.Idle
 	b.cc.UpdateState(balancer.State{
-		ConnectivityState: connectivity.Idle,
-		Picker:            &picker{result: balancer.PickResult{SubConn: b.subConn}},
+		ConnectivityState: connectivity.Connecting,
+		Picker:            &picker{err: balancer.ErrNoSubConnAvailable},
 	})
 	b.subConn.Connect()
 	return nil
@@ -119,7 +153,6 @@ func (b *pickfirstBalancer) UpdateSubConnState(subConn balancer.SubConn, state b
 		}
 		return
 	}
-	b.state = state.ConnectivityState
 	if state.ConnectivityState == connectivity.Shutdown {
 		b.subConn = nil
 		return
@@ -132,11 +165,21 @@ func (b *pickfirstBalancer) UpdateSubConnState(subConn balancer.SubConn, state b
 			Picker:            &picker{result: balancer.PickResult{SubConn: subConn}},
 		})
 	case connectivity.Connecting:
+		if b.state == connectivity.TransientFailure {
+			// We stay in TransientFailure until we are Ready. See A62.
+			return
+		}
 		b.cc.UpdateState(balancer.State{
 			ConnectivityState: state.ConnectivityState,
 			Picker:            &picker{err: balancer.ErrNoSubConnAvailable},
 		})
 	case connectivity.Idle:
+		if b.state == connectivity.TransientFailure {
+			// We stay in TransientFailure until we are Ready. Also kick the
+			// subConn out of Idle into Connecting. See A62.
+			b.subConn.Connect()
+			return
+		}
 		b.cc.UpdateState(balancer.State{
 			ConnectivityState: state.ConnectivityState,
 			Picker:            &idlePicker{subConn: subConn},
@@ -147,6 +190,7 @@ func (b *pickfirstBalancer) UpdateSubConnState(subConn balancer.SubConn, state b
 			Picker:            &picker{err: state.ConnectionError},
 		})
 	}
+	b.state = state.ConnectivityState
 }
 
 func (b *pickfirstBalancer) Close() {
diff --git a/vendor/google.golang.org/grpc/preloader.go b/vendor/google.golang.org/grpc/preloader.go
index 0a1e975ad..cd4554785 100644
--- a/vendor/google.golang.org/grpc/preloader.go
+++ b/vendor/google.golang.org/grpc/preloader.go
@@ -25,7 +25,7 @@ import (
 
 // PreparedMsg is responsible for creating a Marshalled and Compressed object.
 //
-// Experimental
+// # Experimental
 //
 // Notice: This type is EXPERIMENTAL and may be changed or removed in a
 // later release.
diff --git a/vendor/google.golang.org/grpc/regenerate.sh b/vendor/google.golang.org/grpc/regenerate.sh
index 99db79faf..a6f26c8ab 100644
--- a/vendor/google.golang.org/grpc/regenerate.sh
+++ b/vendor/google.golang.org/grpc/regenerate.sh
@@ -57,7 +57,8 @@ LEGACY_SOURCES=(
   ${WORKDIR}/grpc-proto/grpc/health/v1/health.proto
   ${WORKDIR}/grpc-proto/grpc/lb/v1/load_balancer.proto
   profiling/proto/service.proto
-  reflection/grpc_reflection_v1alpha/reflection.proto
+  ${WORKDIR}/grpc-proto/grpc/reflection/v1alpha/reflection.proto
+  ${WORKDIR}/grpc-proto/grpc/reflection/v1/reflection.proto
 )
 
 # Generates only the new gRPC Service symbols
@@ -119,8 +120,4 @@ mv ${WORKDIR}/out/google.golang.org/grpc/lookup/grpc_lookup_v1/* ${WORKDIR}/out/
 # see grpc_testing_not_regenerate/README.md for details.
 rm ${WORKDIR}/out/google.golang.org/grpc/reflection/grpc_testing_not_regenerate/*.pb.go
 
-# grpc/testing does not have a go_package option.
-mv ${WORKDIR}/out/grpc/testing/*.pb.go interop/grpc_testing/
-mv ${WORKDIR}/out/grpc/core/*.pb.go interop/grpc_testing/core/
-
 cp -R ${WORKDIR}/out/google.golang.org/grpc/* .
diff --git a/vendor/google.golang.org/grpc/resolver/resolver.go b/vendor/google.golang.org/grpc/resolver/resolver.go
index ca2e35a35..353c10b69 100644
--- a/vendor/google.golang.org/grpc/resolver/resolver.go
+++ b/vendor/google.golang.org/grpc/resolver/resolver.go
@@ -22,12 +22,13 @@ package resolver
 
 import (
 	"context"
+	"fmt"
 	"net"
 	"net/url"
+	"strings"
 
 	"google.golang.org/grpc/attributes"
 	"google.golang.org/grpc/credentials"
-	"google.golang.org/grpc/internal/pretty"
 	"google.golang.org/grpc/serviceconfig"
 )
 
@@ -40,8 +41,9 @@ var (
 
 // TODO(bar) install dns resolver in init(){}.
 
-// Register registers the resolver builder to the resolver map. b.Scheme will be
-// used as the scheme registered with this builder.
+// Register registers the resolver builder to the resolver map. b.Scheme will
+// be used as the scheme registered with this builder. The registry is case
+// sensitive, and schemes should not contain any uppercase characters.
 //
 // NOTE: this function must only be called during initialization time (i.e. in
 // an init() function), and is not thread-safe. If multiple Resolvers are
@@ -96,7 +98,7 @@ const (
 
 // Address represents a server the client connects to.
 //
-// Experimental
+// # Experimental
 //
 // Notice: This type is EXPERIMENTAL and may be changed or removed in a
 // later release.
@@ -122,7 +124,7 @@ type Address struct {
 	Attributes *attributes.Attributes
 
 	// BalancerAttributes contains arbitrary data about this address intended
-	// for consumption by the LB policy.  These attribes do not affect SubConn
+	// for consumption by the LB policy.  These attributes do not affect SubConn
 	// creation, connection establishment, handshaking, etc.
 	BalancerAttributes *attributes.Attributes
 
@@ -149,7 +151,17 @@ func (a Address) Equal(o Address) bool {
 
 // String returns JSON formatted string representation of the address.
 func (a Address) String() string {
-	return pretty.ToJSON(a)
+	var sb strings.Builder
+	sb.WriteString(fmt.Sprintf("{Addr: %q, ", a.Addr))
+	sb.WriteString(fmt.Sprintf("ServerName: %q, ", a.ServerName))
+	if a.Attributes != nil {
+		sb.WriteString(fmt.Sprintf("Attributes: %v, ", a.Attributes.String()))
+	}
+	if a.BalancerAttributes != nil {
+		sb.WriteString(fmt.Sprintf("BalancerAttributes: %v", a.BalancerAttributes.String()))
+	}
+	sb.WriteString("}")
+	return sb.String()
 }
 
 // BuildOptions includes additional information for the builder to create
@@ -202,6 +214,15 @@ type State struct {
 // gRPC to add new methods to this interface.
 type ClientConn interface {
 	// UpdateState updates the state of the ClientConn appropriately.
+	//
+	// If an error is returned, the resolver should try to resolve the
+	// target again. The resolver should use a backoff timer to prevent
+	// overloading the server with requests. If a resolver is certain that
+	// reresolving will not change the result, e.g. because it is
+	// a watch-based resolver, returned errors can be ignored.
+	//
+	// If the resolved State is the same as the last reported one, calling
+	// UpdateState can be omitted.
 	UpdateState(State) error
 	// ReportError notifies the ClientConn that the Resolver encountered an
 	// error.  The ClientConn will notify the load balancer and begin calling
@@ -236,20 +257,17 @@ type ClientConn interface {
 //
 // Examples:
 //
-// - "dns://some_authority/foo.bar"
-//   Target{Scheme: "dns", Authority: "some_authority", Endpoint: "foo.bar"}
-// - "foo.bar"
-//   Target{Scheme: resolver.GetDefaultScheme(), Endpoint: "foo.bar"}
-// - "unknown_scheme://authority/endpoint"
-//   Target{Scheme: resolver.GetDefaultScheme(), Endpoint: "unknown_scheme://authority/endpoint"}
+//   - "dns://some_authority/foo.bar"
+//     Target{Scheme: "dns", Authority: "some_authority", Endpoint: "foo.bar"}
+//   - "foo.bar"
+//     Target{Scheme: resolver.GetDefaultScheme(), Endpoint: "foo.bar"}
+//   - "unknown_scheme://authority/endpoint"
+//     Target{Scheme: resolver.GetDefaultScheme(), Endpoint: "unknown_scheme://authority/endpoint"}
 type Target struct {
 	// Deprecated: use URL.Scheme instead.
 	Scheme string
 	// Deprecated: use URL.Host instead.
 	Authority string
-	// Deprecated: use URL.Path or URL.Opaque instead. The latter is set when
-	// the former is empty.
-	Endpoint string
 	// URL contains the parsed dial target with an optional default scheme added
 	// to it if the original dial target contained no scheme or contained an
 	// unregistered scheme. Any query params specified in the original dial
@@ -257,6 +275,24 @@ type Target struct {
 	URL url.URL
 }
 
+// Endpoint retrieves endpoint without leading "/" from either `URL.Path`
+// or `URL.Opaque`. The latter is used when the former is empty.
+func (t Target) Endpoint() string {
+	endpoint := t.URL.Path
+	if endpoint == "" {
+		endpoint = t.URL.Opaque
+	}
+	// For targets of the form "[scheme]://[authority]/endpoint, the endpoint
+	// value returned from url.Parse() contains a leading "/". Although this is
+	// in accordance with RFC 3986, we do not want to break existing resolver
+	// implementations which expect the endpoint without the leading "/". So, we
+	// end up stripping the leading "/" here. But this will result in an
+	// incorrect parsing for something like "unix:///path/to/socket". Since we
+	// own the "unix" resolver, we can workaround in the unix resolver by using
+	// the `URL` field.
+	return strings.TrimPrefix(endpoint, "/")
+}
+
 // Builder creates a resolver that will be used to watch name resolution updates.
 type Builder interface {
 	// Build creates a new resolver for the given target.
@@ -264,8 +300,10 @@ type Builder interface {
 	// gRPC dial calls Build synchronously, and fails if the returned error is
 	// not nil.
 	Build(target Target, cc ClientConn, opts BuildOptions) (Resolver, error)
-	// Scheme returns the scheme supported by this resolver.
-	// Scheme is defined at https://github.com/grpc/grpc/blob/master/doc/naming.md.
+	// Scheme returns the scheme supported by this resolver.  Scheme is defined
+	// at https://github.com/grpc/grpc/blob/master/doc/naming.md.  The returned
+	// string should not contain uppercase characters, as they will not match
+	// the parsed target's scheme as defined in RFC 3986.
 	Scheme() string
 }
 
diff --git a/vendor/google.golang.org/grpc/resolver_conn_wrapper.go b/vendor/google.golang.org/grpc/resolver_conn_wrapper.go
index 05a9d4e0b..b408b3688 100644
--- a/vendor/google.golang.org/grpc/resolver_conn_wrapper.go
+++ b/vendor/google.golang.org/grpc/resolver_conn_wrapper.go
@@ -19,11 +19,11 @@
 package grpc
 
 import (
+	"context"
 	"strings"
 	"sync"
 
 	"google.golang.org/grpc/balancer"
-	"google.golang.org/grpc/credentials"
 	"google.golang.org/grpc/internal/channelz"
 	"google.golang.org/grpc/internal/grpcsync"
 	"google.golang.org/grpc/internal/pretty"
@@ -31,129 +31,192 @@ import (
 	"google.golang.org/grpc/serviceconfig"
 )
 
+// resolverStateUpdater wraps the single method used by ccResolverWrapper to
+// report a state update from the actual resolver implementation.
+type resolverStateUpdater interface {
+	updateResolverState(s resolver.State, err error) error
+}
+
 // ccResolverWrapper is a wrapper on top of cc for resolvers.
 // It implements resolver.ClientConn interface.
 type ccResolverWrapper struct {
-	cc         *ClientConn
-	resolverMu sync.Mutex
-	resolver   resolver.Resolver
-	done       *grpcsync.Event
-	curState   resolver.State
+	// The following fields are initialized when the wrapper is created and are
+	// read-only afterwards, and therefore can be accessed without a mutex.
+	cc                  resolverStateUpdater
+	channelzID          *channelz.Identifier
+	ignoreServiceConfig bool
+	opts                ccResolverWrapperOpts
+	serializer          *grpcsync.CallbackSerializer // To serialize all incoming calls.
+	serializerCancel    context.CancelFunc           // To close the serializer, accessed only from close().
+
+	// All incoming (resolver --> gRPC) calls are guaranteed to execute in a
+	// mutually exclusive manner as they are scheduled on the serializer.
+	// Fields accessed *only* in these serializer callbacks, can therefore be
+	// accessed without a mutex.
+	curState resolver.State
+
+	// mu guards access to the below fields.
+	mu       sync.Mutex
+	closed   bool
+	resolver resolver.Resolver // Accessed only from outgoing calls.
+}
 
-	incomingMu sync.Mutex // Synchronizes all the incoming calls.
+// ccResolverWrapperOpts wraps the arguments to be passed when creating a new
+// ccResolverWrapper.
+type ccResolverWrapperOpts struct {
+	target     resolver.Target       // User specified dial target to resolve.
+	builder    resolver.Builder      // Resolver builder to use.
+	bOpts      resolver.BuildOptions // Resolver build options to use.
+	channelzID *channelz.Identifier  // Channelz identifier for the channel.
 }
 
 // newCCResolverWrapper uses the resolver.Builder to build a Resolver and
 // returns a ccResolverWrapper object which wraps the newly built resolver.
-func newCCResolverWrapper(cc *ClientConn, rb resolver.Builder) (*ccResolverWrapper, error) {
+func newCCResolverWrapper(cc resolverStateUpdater, opts ccResolverWrapperOpts) (*ccResolverWrapper, error) {
+	ctx, cancel := context.WithCancel(context.Background())
 	ccr := &ccResolverWrapper{
-		cc:   cc,
-		done: grpcsync.NewEvent(),
-	}
-
-	var credsClone credentials.TransportCredentials
-	if creds := cc.dopts.copts.TransportCredentials; creds != nil {
-		credsClone = creds.Clone()
-	}
-	rbo := resolver.BuildOptions{
-		DisableServiceConfig: cc.dopts.disableServiceConfig,
-		DialCreds:            credsClone,
-		CredsBundle:          cc.dopts.copts.CredsBundle,
-		Dialer:               cc.dopts.copts.Dialer,
-	}
-
-	var err error
-	// We need to hold the lock here while we assign to the ccr.resolver field
-	// to guard against a data race caused by the following code path,
-	// rb.Build-->ccr.ReportError-->ccr.poll-->ccr.resolveNow, would end up
-	// accessing ccr.resolver which is being assigned here.
-	ccr.resolverMu.Lock()
-	defer ccr.resolverMu.Unlock()
-	ccr.resolver, err = rb.Build(cc.parsedTarget, ccr, rbo)
+		cc:                  cc,
+		channelzID:          opts.channelzID,
+		ignoreServiceConfig: opts.bOpts.DisableServiceConfig,
+		opts:                opts,
+		serializer:          grpcsync.NewCallbackSerializer(ctx),
+		serializerCancel:    cancel,
+	}
+
+	// Cannot hold the lock at build time because the resolver can send an
+	// update or error inline and these incoming calls grab the lock to schedule
+	// a callback in the serializer.
+	r, err := opts.builder.Build(opts.target, ccr, opts.bOpts)
 	if err != nil {
+		cancel()
 		return nil, err
 	}
+
+	// Any error reported by the resolver at build time that leads to a
+	// re-resolution request from the balancer is dropped by grpc until we
+	// return from this function. So, we don't have to handle pending resolveNow
+	// requests here.
+	ccr.mu.Lock()
+	ccr.resolver = r
+	ccr.mu.Unlock()
+
 	return ccr, nil
 }
 
 func (ccr *ccResolverWrapper) resolveNow(o resolver.ResolveNowOptions) {
-	ccr.resolverMu.Lock()
-	if !ccr.done.HasFired() {
-		ccr.resolver.ResolveNow(o)
+	ccr.mu.Lock()
+	defer ccr.mu.Unlock()
+
+	// ccr.resolver field is set only after the call to Build() returns. But in
+	// the process of building, the resolver may send an error update which when
+	// propagated to the balancer may result in a re-resolution request.
+	if ccr.closed || ccr.resolver == nil {
+		return
 	}
-	ccr.resolverMu.Unlock()
+	ccr.resolver.ResolveNow(o)
 }
 
 func (ccr *ccResolverWrapper) close() {
-	ccr.resolverMu.Lock()
-	ccr.resolver.Close()
-	ccr.done.Fire()
-	ccr.resolverMu.Unlock()
+	ccr.mu.Lock()
+	if ccr.closed {
+		ccr.mu.Unlock()
+		return
+	}
+
+	channelz.Info(logger, ccr.channelzID, "Closing the name resolver")
+
+	// Close the serializer to ensure that no more calls from the resolver are
+	// handled, before actually closing the resolver.
+	ccr.serializerCancel()
+	ccr.closed = true
+	r := ccr.resolver
+	ccr.mu.Unlock()
+
+	// Give enqueued callbacks a chance to finish.
+	<-ccr.serializer.Done
+
+	// Spawn a goroutine to close the resolver (since it may block trying to
+	// cleanup all allocated resources) and return early.
+	go r.Close()
+}
+
+// serializerScheduleLocked is a convenience method to schedule a function to be
+// run on the serializer while holding ccr.mu.
+func (ccr *ccResolverWrapper) serializerScheduleLocked(f func(context.Context)) {
+	ccr.mu.Lock()
+	ccr.serializer.Schedule(f)
+	ccr.mu.Unlock()
 }
 
+// UpdateState is called by resolver implementations to report new state to gRPC
+// which includes addresses and service config.
 func (ccr *ccResolverWrapper) UpdateState(s resolver.State) error {
-	ccr.incomingMu.Lock()
-	defer ccr.incomingMu.Unlock()
-	if ccr.done.HasFired() {
+	errCh := make(chan error, 1)
+	ok := ccr.serializer.Schedule(func(context.Context) {
+		ccr.addChannelzTraceEvent(s)
+		ccr.curState = s
+		if err := ccr.cc.updateResolverState(ccr.curState, nil); err == balancer.ErrBadResolverState {
+			errCh <- balancer.ErrBadResolverState
+			return
+		}
+		errCh <- nil
+	})
+	if !ok {
+		// The only time when Schedule() fail to add the callback to the
+		// serializer is when the serializer is closed, and this happens only
+		// when the resolver wrapper is closed.
 		return nil
 	}
-	ccr.addChannelzTraceEvent(s)
-	ccr.curState = s
-	if err := ccr.cc.updateResolverState(ccr.curState, nil); err == balancer.ErrBadResolverState {
-		return balancer.ErrBadResolverState
-	}
-	return nil
+	return <-errCh
 }
 
+// ReportError is called by resolver implementations to report errors
+// encountered during name resolution to gRPC.
 func (ccr *ccResolverWrapper) ReportError(err error) {
-	ccr.incomingMu.Lock()
-	defer ccr.incomingMu.Unlock()
-	if ccr.done.HasFired() {
-		return
-	}
-	channelz.Warningf(logger, ccr.cc.channelzID, "ccResolverWrapper: reporting error to cc: %v", err)
-	ccr.cc.updateResolverState(resolver.State{}, err)
+	ccr.serializerScheduleLocked(func(_ context.Context) {
+		channelz.Warningf(logger, ccr.channelzID, "ccResolverWrapper: reporting error to cc: %v", err)
+		ccr.cc.updateResolverState(resolver.State{}, err)
+	})
 }
 
-// NewAddress is called by the resolver implementation to send addresses to gRPC.
+// NewAddress is called by the resolver implementation to send addresses to
+// gRPC.
 func (ccr *ccResolverWrapper) NewAddress(addrs []resolver.Address) {
-	ccr.incomingMu.Lock()
-	defer ccr.incomingMu.Unlock()
-	if ccr.done.HasFired() {
-		return
-	}
-	ccr.addChannelzTraceEvent(resolver.State{Addresses: addrs, ServiceConfig: ccr.curState.ServiceConfig})
-	ccr.curState.Addresses = addrs
-	ccr.cc.updateResolverState(ccr.curState, nil)
+	ccr.serializerScheduleLocked(func(_ context.Context) {
+		ccr.addChannelzTraceEvent(resolver.State{Addresses: addrs, ServiceConfig: ccr.curState.ServiceConfig})
+		ccr.curState.Addresses = addrs
+		ccr.cc.updateResolverState(ccr.curState, nil)
+	})
 }
 
 // NewServiceConfig is called by the resolver implementation to send service
 // configs to gRPC.
 func (ccr *ccResolverWrapper) NewServiceConfig(sc string) {
-	ccr.incomingMu.Lock()
-	defer ccr.incomingMu.Unlock()
-	if ccr.done.HasFired() {
-		return
-	}
-	channelz.Infof(logger, ccr.cc.channelzID, "ccResolverWrapper: got new service config: %s", sc)
-	if ccr.cc.dopts.disableServiceConfig {
-		channelz.Info(logger, ccr.cc.channelzID, "Service config lookups disabled; ignoring config")
-		return
-	}
-	scpr := parseServiceConfig(sc)
-	if scpr.Err != nil {
-		channelz.Warningf(logger, ccr.cc.channelzID, "ccResolverWrapper: error parsing service config: %v", scpr.Err)
-		return
-	}
-	ccr.addChannelzTraceEvent(resolver.State{Addresses: ccr.curState.Addresses, ServiceConfig: scpr})
-	ccr.curState.ServiceConfig = scpr
-	ccr.cc.updateResolverState(ccr.curState, nil)
+	ccr.serializerScheduleLocked(func(_ context.Context) {
+		channelz.Infof(logger, ccr.channelzID, "ccResolverWrapper: got new service config: %s", sc)
+		if ccr.ignoreServiceConfig {
+			channelz.Info(logger, ccr.channelzID, "Service config lookups disabled; ignoring config")
+			return
+		}
+		scpr := parseServiceConfig(sc)
+		if scpr.Err != nil {
+			channelz.Warningf(logger, ccr.channelzID, "ccResolverWrapper: error parsing service config: %v", scpr.Err)
+			return
+		}
+		ccr.addChannelzTraceEvent(resolver.State{Addresses: ccr.curState.Addresses, ServiceConfig: scpr})
+		ccr.curState.ServiceConfig = scpr
+		ccr.cc.updateResolverState(ccr.curState, nil)
+	})
 }
 
+// ParseServiceConfig is called by resolver implementations to parse a JSON
+// representation of the service config.
 func (ccr *ccResolverWrapper) ParseServiceConfig(scJSON string) *serviceconfig.ParseResult {
 	return parseServiceConfig(scJSON)
 }
 
+// addChannelzTraceEvent adds a channelz trace event containing the new
+// state received from resolver implementations.
 func (ccr *ccResolverWrapper) addChannelzTraceEvent(s resolver.State) {
 	var updates []string
 	var oldSC, newSC *ServiceConfig
@@ -172,5 +235,5 @@ func (ccr *ccResolverWrapper) addChannelzTraceEvent(s resolver.State) {
 	} else if len(ccr.curState.Addresses) == 0 && len(s.Addresses) > 0 {
 		updates = append(updates, "resolver returned new addresses")
 	}
-	channelz.Infof(logger, ccr.cc.channelzID, "Resolver state updated: %s (%v)", pretty.ToJSON(s), strings.Join(updates, "; "))
+	channelz.Infof(logger, ccr.channelzID, "Resolver state updated: %s (%v)", pretty.ToJSON(s), strings.Join(updates, "; "))
 }
diff --git a/vendor/google.golang.org/grpc/rpc_util.go b/vendor/google.golang.org/grpc/rpc_util.go
index 5d407b004..2030736a3 100644
--- a/vendor/google.golang.org/grpc/rpc_util.go
+++ b/vendor/google.golang.org/grpc/rpc_util.go
@@ -25,7 +25,6 @@ import (
 	"encoding/binary"
 	"fmt"
 	"io"
-	"io/ioutil"
 	"math"
 	"strings"
 	"sync"
@@ -77,7 +76,7 @@ func NewGZIPCompressorWithLevel(level int) (Compressor, error) {
 	return &gzipCompressor{
 		pool: sync.Pool{
 			New: func() interface{} {
-				w, err := gzip.NewWriterLevel(ioutil.Discard, level)
+				w, err := gzip.NewWriterLevel(io.Discard, level)
 				if err != nil {
 					panic(err)
 				}
@@ -143,7 +142,7 @@ func (d *gzipDecompressor) Do(r io.Reader) ([]byte, error) {
 		z.Close()
 		d.pool.Put(z)
 	}()
-	return ioutil.ReadAll(z)
+	return io.ReadAll(z)
 }
 
 func (d *gzipDecompressor) Type() string {
@@ -160,6 +159,7 @@ type callInfo struct {
 	contentSubtype        string
 	codec                 baseCodec
 	maxRetryRPCBufferSize int
+	onFinish              []func(err error)
 }
 
 func defaultCallInfo() *callInfo {
@@ -198,7 +198,7 @@ func Header(md *metadata.MD) CallOption {
 // HeaderCallOption is a CallOption for collecting response header metadata.
 // The metadata field will be populated *after* the RPC completes.
 //
-// Experimental
+// # Experimental
 //
 // Notice: This type is EXPERIMENTAL and may be changed or removed in a
 // later release.
@@ -220,7 +220,7 @@ func Trailer(md *metadata.MD) CallOption {
 // TrailerCallOption is a CallOption for collecting response trailer metadata.
 // The metadata field will be populated *after* the RPC completes.
 //
-// Experimental
+// # Experimental
 //
 // Notice: This type is EXPERIMENTAL and may be changed or removed in a
 // later release.
@@ -242,7 +242,7 @@ func Peer(p *peer.Peer) CallOption {
 // PeerCallOption is a CallOption for collecting the identity of the remote
 // peer. The peer field will be populated *after* the RPC completes.
 //
-// Experimental
+// # Experimental
 //
 // Notice: This type is EXPERIMENTAL and may be changed or removed in a
 // later release.
@@ -282,7 +282,7 @@ func FailFast(failFast bool) CallOption {
 // FailFastCallOption is a CallOption for indicating whether an RPC should fail
 // fast or not.
 //
-// Experimental
+// # Experimental
 //
 // Notice: This type is EXPERIMENTAL and may be changed or removed in a
 // later release.
@@ -296,8 +296,44 @@ func (o FailFastCallOption) before(c *callInfo) error {
 }
 func (o FailFastCallOption) after(c *callInfo, attempt *csAttempt) {}
 
+// OnFinish returns a CallOption that configures a callback to be called when
+// the call completes. The error passed to the callback is the status of the
+// RPC, and may be nil. The onFinish callback provided will only be called once
+// by gRPC. This is mainly used to be used by streaming interceptors, to be
+// notified when the RPC completes along with information about the status of
+// the RPC.
+//
+// # Experimental
+//
+// Notice: This API is EXPERIMENTAL and may be changed or removed in a
+// later release.
+func OnFinish(onFinish func(err error)) CallOption {
+	return OnFinishCallOption{
+		OnFinish: onFinish,
+	}
+}
+
+// OnFinishCallOption is CallOption that indicates a callback to be called when
+// the call completes.
+//
+// # Experimental
+//
+// Notice: This type is EXPERIMENTAL and may be changed or removed in a
+// later release.
+type OnFinishCallOption struct {
+	OnFinish func(error)
+}
+
+func (o OnFinishCallOption) before(c *callInfo) error {
+	c.onFinish = append(c.onFinish, o.OnFinish)
+	return nil
+}
+
+func (o OnFinishCallOption) after(c *callInfo, attempt *csAttempt) {}
+
 // MaxCallRecvMsgSize returns a CallOption which sets the maximum message size
-// in bytes the client can receive.
+// in bytes the client can receive. If this is not set, gRPC uses the default
+// 4MB.
 func MaxCallRecvMsgSize(bytes int) CallOption {
 	return MaxRecvMsgSizeCallOption{MaxRecvMsgSize: bytes}
 }
@@ -305,7 +341,7 @@ func MaxCallRecvMsgSize(bytes int) CallOption {
 // MaxRecvMsgSizeCallOption is a CallOption that indicates the maximum message
 // size in bytes the client can receive.
 //
-// Experimental
+// # Experimental
 //
 // Notice: This type is EXPERIMENTAL and may be changed or removed in a
 // later release.
@@ -320,7 +356,8 @@ func (o MaxRecvMsgSizeCallOption) before(c *callInfo) error {
 func (o MaxRecvMsgSizeCallOption) after(c *callInfo, attempt *csAttempt) {}
 
 // MaxCallSendMsgSize returns a CallOption which sets the maximum message size
-// in bytes the client can send.
+// in bytes the client can send. If this is not set, gRPC uses the default
+// `math.MaxInt32`.
 func MaxCallSendMsgSize(bytes int) CallOption {
 	return MaxSendMsgSizeCallOption{MaxSendMsgSize: bytes}
 }
@@ -328,7 +365,7 @@ func MaxCallSendMsgSize(bytes int) CallOption {
 // MaxSendMsgSizeCallOption is a CallOption that indicates the maximum message
 // size in bytes the client can send.
 //
-// Experimental
+// # Experimental
 //
 // Notice: This type is EXPERIMENTAL and may be changed or removed in a
 // later release.
@@ -351,7 +388,7 @@ func PerRPCCredentials(creds credentials.PerRPCCredentials) CallOption {
 // PerRPCCredsCallOption is a CallOption that indicates the per-RPC
 // credentials to use for the call.
 //
-// Experimental
+// # Experimental
 //
 // Notice: This type is EXPERIMENTAL and may be changed or removed in a
 // later release.
@@ -369,7 +406,7 @@ func (o PerRPCCredsCallOption) after(c *callInfo, attempt *csAttempt) {}
 // sending the request.  If WithCompressor is also set, UseCompressor has
 // higher priority.
 //
-// Experimental
+// # Experimental
 //
 // Notice: This API is EXPERIMENTAL and may be changed or removed in a
 // later release.
@@ -379,7 +416,7 @@ func UseCompressor(name string) CallOption {
 
 // CompressorCallOption is a CallOption that indicates the compressor to use.
 //
-// Experimental
+// # Experimental
 //
 // Notice: This type is EXPERIMENTAL and may be changed or removed in a
 // later release.
@@ -416,7 +453,7 @@ func CallContentSubtype(contentSubtype string) CallOption {
 // ContentSubtypeCallOption is a CallOption that indicates the content-subtype
 // used for marshaling messages.
 //
-// Experimental
+// # Experimental
 //
 // Notice: This type is EXPERIMENTAL and may be changed or removed in a
 // later release.
@@ -444,7 +481,7 @@ func (o ContentSubtypeCallOption) after(c *callInfo, attempt *csAttempt) {}
 // This function is provided for advanced users; prefer to use only
 // CallContentSubtype to select a registered codec instead.
 //
-// Experimental
+// # Experimental
 //
 // Notice: This API is EXPERIMENTAL and may be changed or removed in a
 // later release.
@@ -455,7 +492,7 @@ func ForceCodec(codec encoding.Codec) CallOption {
 // ForceCodecCallOption is a CallOption that indicates the codec used for
 // marshaling messages.
 //
-// Experimental
+// # Experimental
 //
 // Notice: This type is EXPERIMENTAL and may be changed or removed in a
 // later release.
@@ -480,7 +517,7 @@ func CallCustomCodec(codec Codec) CallOption {
 // CustomCodecCallOption is a CallOption that indicates the codec used for
 // marshaling messages.
 //
-// Experimental
+// # Experimental
 //
 // Notice: This type is EXPERIMENTAL and may be changed or removed in a
 // later release.
@@ -497,7 +534,7 @@ func (o CustomCodecCallOption) after(c *callInfo, attempt *csAttempt) {}
 // MaxRetryRPCBufferSize returns a CallOption that limits the amount of memory
 // used for buffering this RPC's requests for retry purposes.
 //
-// Experimental
+// # Experimental
 //
 // Notice: This API is EXPERIMENTAL and may be changed or removed in a
 // later release.
@@ -508,7 +545,7 @@ func MaxRetryRPCBufferSize(bytes int) CallOption {
 // MaxRetryRPCBufferSizeCallOption is a CallOption indicating the amount of
 // memory to be used for caching this RPC for retry purposes.
 //
-// Experimental
+// # Experimental
 //
 // Notice: This type is EXPERIMENTAL and may be changed or removed in a
 // later release.
@@ -548,10 +585,11 @@ type parser struct {
 // format. The caller owns the returned msg memory.
 //
 // If there is an error, possible values are:
-//   * io.EOF, when no messages remain
-//   * io.ErrUnexpectedEOF
-//   * of type transport.ConnectionError
-//   * an error from the status package
+//   - io.EOF, when no messages remain
+//   - io.ErrUnexpectedEOF
+//   - of type transport.ConnectionError
+//   - an error from the status package
+//
 // No other error values or types must be returned, which also means
 // that the underlying io.Reader must not return an incompatible
 // error.
@@ -656,12 +694,13 @@ func msgHeader(data, compData []byte) (hdr []byte, payload []byte) {
 
 func outPayload(client bool, msg interface{}, data, payload []byte, t time.Time) *stats.OutPayload {
 	return &stats.OutPayload{
-		Client:     client,
-		Payload:    msg,
-		Data:       data,
-		Length:     len(data),
-		WireLength: len(payload) + headerLen,
-		SentTime:   t,
+		Client:           client,
+		Payload:          msg,
+		Data:             data,
+		Length:           len(data),
+		WireLength:       len(payload) + headerLen,
+		CompressedLength: len(payload),
+		SentTime:         t,
 	}
 }
 
@@ -682,7 +721,7 @@ func checkRecvPayload(pf payloadFormat, recvCompress string, haveCompressor bool
 }
 
 type payloadInfo struct {
-	wireLength        int // The compressed length got from wire.
+	compressedLength  int // The compressed length got from wire.
 	uncompressedBytes []byte
 }
 
@@ -692,7 +731,7 @@ func recvAndDecompress(p *parser, s *transport.Stream, dc Decompressor, maxRecei
 		return nil, err
 	}
 	if payInfo != nil {
-		payInfo.wireLength = len(d)
+		payInfo.compressedLength = len(d)
 	}
 
 	if st := checkRecvPayload(pf, s.RecvCompress(), compressor != nil || dc != nil); st != nil {
@@ -710,7 +749,7 @@ func recvAndDecompress(p *parser, s *transport.Stream, dc Decompressor, maxRecei
 			d, size, err = decompress(compressor, d, maxReceiveMessageSize)
 		}
 		if err != nil {
-			return nil, status.Errorf(codes.Internal, "grpc: failed to decompress the received message %v", err)
+			return nil, status.Errorf(codes.Internal, "grpc: failed to decompress the received message: %v", err)
 		}
 		if size > maxReceiveMessageSize {
 			// TODO: Revisit the error code. Currently keep it consistent with java
@@ -745,7 +784,7 @@ func decompress(compressor encoding.Compressor, d []byte, maxReceiveMessageSize
 	}
 	// Read from LimitReader with limit max+1. So if the underlying
 	// reader is over limit, the result will be bigger than max.
-	d, err = ioutil.ReadAll(io.LimitReader(dcReader, int64(maxReceiveMessageSize)+1))
+	d, err = io.ReadAll(io.LimitReader(dcReader, int64(maxReceiveMessageSize)+1))
 	return d, len(d), err
 }
 
@@ -758,7 +797,7 @@ func recv(p *parser, c baseCodec, s *transport.Stream, dc Decompressor, m interf
 		return err
 	}
 	if err := c.Unmarshal(d, m); err != nil {
-		return status.Errorf(codes.Internal, "grpc: failed to unmarshal the received message %v", err)
+		return status.Errorf(codes.Internal, "grpc: failed to unmarshal the received message: %v", err)
 	}
 	if payInfo != nil {
 		payInfo.uncompressedBytes = d
diff --git a/vendor/google.golang.org/grpc/server.go b/vendor/google.golang.org/grpc/server.go
index 2ad9da7bf..8869cc906 100644
--- a/vendor/google.golang.org/grpc/server.go
+++ b/vendor/google.golang.org/grpc/server.go
@@ -43,8 +43,8 @@ import (
 	"google.golang.org/grpc/internal"
 	"google.golang.org/grpc/internal/binarylog"
 	"google.golang.org/grpc/internal/channelz"
-	"google.golang.org/grpc/internal/grpcrand"
 	"google.golang.org/grpc/internal/grpcsync"
+	"google.golang.org/grpc/internal/grpcutil"
 	"google.golang.org/grpc/internal/transport"
 	"google.golang.org/grpc/keepalive"
 	"google.golang.org/grpc/metadata"
@@ -73,12 +73,14 @@ func init() {
 	internal.DrainServerTransports = func(srv *Server, addr string) {
 		srv.drainServerTransports(addr)
 	}
-	internal.AddExtraServerOptions = func(opt ...ServerOption) {
-		extraServerOptions = opt
+	internal.AddGlobalServerOptions = func(opt ...ServerOption) {
+		globalServerOptions = append(globalServerOptions, opt...)
 	}
-	internal.ClearExtraServerOptions = func() {
-		extraServerOptions = nil
+	internal.ClearGlobalServerOptions = func() {
+		globalServerOptions = nil
 	}
+	internal.BinaryLogger = binaryLogger
+	internal.JoinServerOptions = newJoinServerOption
 }
 
 var statusOK = status.New(codes.OK, "")
@@ -113,12 +115,6 @@ type serviceInfo struct {
 	mdata       interface{}
 }
 
-type serverWorkerData struct {
-	st     transport.ServerTransport
-	wg     *sync.WaitGroup
-	stream *transport.Stream
-}
-
 // Server is a gRPC server to serve RPC requests.
 type Server struct {
 	opts serverOptions
@@ -143,7 +139,7 @@ type Server struct {
 	channelzID *channelz.Identifier
 	czData     *channelzData
 
-	serverWorkerChannels []chan *serverWorkerData
+	serverWorkerChannel chan func()
 }
 
 type serverOptions struct {
@@ -155,6 +151,7 @@ type serverOptions struct {
 	streamInt             StreamServerInterceptor
 	chainUnaryInts        []UnaryServerInterceptor
 	chainStreamInts       []StreamServerInterceptor
+	binaryLogger          binarylog.Logger
 	inTapHandle           tap.ServerInHandle
 	statsHandlers         []stats.Handler
 	maxConcurrentStreams  uint32
@@ -174,13 +171,14 @@ type serverOptions struct {
 }
 
 var defaultServerOptions = serverOptions{
+	maxConcurrentStreams:  math.MaxUint32,
 	maxReceiveMessageSize: defaultServerMaxReceiveMessageSize,
 	maxSendMessageSize:    defaultServerMaxSendMessageSize,
 	connectionTimeout:     120 * time.Second,
 	writeBufferSize:       defaultWriteBufSize,
 	readBufferSize:        defaultReadBufSize,
 }
-var extraServerOptions []ServerOption
+var globalServerOptions []ServerOption
 
 // A ServerOption sets options such as credentials, codec and keepalive parameters, etc.
 type ServerOption interface {
@@ -214,10 +212,27 @@ func newFuncServerOption(f func(*serverOptions)) *funcServerOption {
 	}
 }
 
-// WriteBufferSize determines how much data can be batched before doing a write on the wire.
-// The corresponding memory allocation for this buffer will be twice the size to keep syscalls low.
-// The default value for this buffer is 32KB.
-// Zero will disable the write buffer such that each write will be on underlying connection.
+// joinServerOption provides a way to combine arbitrary number of server
+// options into one.
+type joinServerOption struct {
+	opts []ServerOption
+}
+
+func (mdo *joinServerOption) apply(do *serverOptions) {
+	for _, opt := range mdo.opts {
+		opt.apply(do)
+	}
+}
+
+func newJoinServerOption(opts ...ServerOption) ServerOption {
+	return &joinServerOption{opts: opts}
+}
+
+// WriteBufferSize determines how much data can be batched before doing a write
+// on the wire. The corresponding memory allocation for this buffer will be
+// twice the size to keep syscalls low. The default value for this buffer is
+// 32KB. Zero or negative values will disable the write buffer such that each
+// write will be on underlying connection.
 // Note: A Send call may not directly translate to a write.
 func WriteBufferSize(s int) ServerOption {
 	return newFuncServerOption(func(o *serverOptions) {
@@ -225,11 +240,10 @@ func WriteBufferSize(s int) ServerOption {
 	})
 }
 
-// ReadBufferSize lets you set the size of read buffer, this determines how much data can be read at most
-// for one read syscall.
-// The default value for this buffer is 32KB.
-// Zero will disable read buffer for a connection so data framer can access the underlying
-// conn directly.
+// ReadBufferSize lets you set the size of read buffer, this determines how much
+// data can be read at most for one read syscall. The default value for this
+// buffer is 32KB. Zero or negative values will disable read buffer for a
+// connection so data framer can access the underlying conn directly.
 func ReadBufferSize(s int) ServerOption {
 	return newFuncServerOption(func(o *serverOptions) {
 		o.readBufferSize = s
@@ -368,6 +382,9 @@ func MaxSendMsgSize(m int) ServerOption {
 // MaxConcurrentStreams returns a ServerOption that will apply a limit on the number
 // of concurrent streams to each ServerTransport.
 func MaxConcurrentStreams(n uint32) ServerOption {
+	if n == 0 {
+		n = math.MaxUint32
+	}
 	return newFuncServerOption(func(o *serverOptions) {
 		o.maxConcurrentStreams = n
 	})
@@ -452,6 +469,14 @@ func StatsHandler(h stats.Handler) ServerOption {
 	})
 }
 
+// binaryLogger returns a ServerOption that can set the binary logger for the
+// server.
+func binaryLogger(bl binarylog.Logger) ServerOption {
+	return newFuncServerOption(func(o *serverOptions) {
+		o.binaryLogger = bl
+	})
+}
+
 // UnknownServiceHandler returns a ServerOption that allows for adding a custom
 // unknown service handler. The provided method is a bidi-streaming RPC service
 // handler that will be invoked instead of returning the "unimplemented" gRPC
@@ -533,47 +558,40 @@ func NumStreamWorkers(numServerWorkers uint32) ServerOption {
 const serverWorkerResetThreshold = 1 << 16
 
 // serverWorkers blocks on a *transport.Stream channel forever and waits for
-// data to be fed by serveStreams. This allows different requests to be
+// data to be fed by serveStreams. This allows multiple requests to be
 // processed by the same goroutine, removing the need for expensive stack
 // re-allocations (see the runtime.morestack problem [1]).
 //
 // [1] https://github.com/golang/go/issues/18138
-func (s *Server) serverWorker(ch chan *serverWorkerData) {
-	// To make sure all server workers don't reset at the same time, choose a
-	// random number of iterations before resetting.
-	threshold := serverWorkerResetThreshold + grpcrand.Intn(serverWorkerResetThreshold)
-	for completed := 0; completed < threshold; completed++ {
-		data, ok := <-ch
+func (s *Server) serverWorker() {
+	for completed := 0; completed < serverWorkerResetThreshold; completed++ {
+		f, ok := <-s.serverWorkerChannel
 		if !ok {
 			return
 		}
-		s.handleStream(data.st, data.stream, s.traceInfo(data.st, data.stream))
-		data.wg.Done()
+		f()
 	}
-	go s.serverWorker(ch)
+	go s.serverWorker()
 }
 
-// initServerWorkers creates worker goroutines and channels to process incoming
+// initServerWorkers creates worker goroutines and a channel to process incoming
 // connections to reduce the time spent overall on runtime.morestack.
 func (s *Server) initServerWorkers() {
-	s.serverWorkerChannels = make([]chan *serverWorkerData, s.opts.numServerWorkers)
+	s.serverWorkerChannel = make(chan func())
 	for i := uint32(0); i < s.opts.numServerWorkers; i++ {
-		s.serverWorkerChannels[i] = make(chan *serverWorkerData)
-		go s.serverWorker(s.serverWorkerChannels[i])
+		go s.serverWorker()
 	}
 }
 
 func (s *Server) stopServerWorkers() {
-	for i := uint32(0); i < s.opts.numServerWorkers; i++ {
-		close(s.serverWorkerChannels[i])
-	}
+	close(s.serverWorkerChannel)
 }
 
 // NewServer creates a gRPC server which has no service registered and has not
 // started to accept requests yet.
 func NewServer(opt ...ServerOption) *Server {
 	opts := defaultServerOptions
-	for _, o := range extraServerOptions {
+	for _, o := range globalServerOptions {
 		o.apply(&opts)
 	}
 	for _, o := range opt {
@@ -870,7 +888,7 @@ func (s *Server) drainServerTransports(addr string) {
 	s.mu.Lock()
 	conns := s.conns[addr]
 	for st := range conns {
-		st.Drain()
+		st.Drain("")
 	}
 	s.mu.Unlock()
 }
@@ -915,29 +933,29 @@ func (s *Server) newHTTP2Transport(c net.Conn) transport.ServerTransport {
 }
 
 func (s *Server) serveStreams(st transport.ServerTransport) {
-	defer st.Close()
+	defer st.Close(errors.New("finished serving streams for the server transport"))
 	var wg sync.WaitGroup
 
-	var roundRobinCounter uint32
+	streamQuota := newHandlerQuota(s.opts.maxConcurrentStreams)
 	st.HandleStreams(func(stream *transport.Stream) {
 		wg.Add(1)
+
+		streamQuota.acquire()
+		f := func() {
+			defer streamQuota.release()
+			defer wg.Done()
+			s.handleStream(st, stream, s.traceInfo(st, stream))
+		}
+
 		if s.opts.numServerWorkers > 0 {
-			data := &serverWorkerData{st: st, wg: &wg, stream: stream}
 			select {
-			case s.serverWorkerChannels[atomic.AddUint32(&roundRobinCounter, 1)%s.opts.numServerWorkers] <- data:
+			case s.serverWorkerChannel <- f:
+				return
 			default:
 				// If all stream workers are busy, fallback to the default code path.
-				go func() {
-					s.handleStream(st, stream, s.traceInfo(st, stream))
-					wg.Done()
-				}()
 			}
-		} else {
-			go func() {
-				defer wg.Done()
-				s.handleStream(st, stream, s.traceInfo(st, stream))
-			}()
 		}
+		go f()
 	}, func(ctx context.Context, method string) context.Context {
 		if !EnableTracing {
 			return ctx
@@ -981,7 +999,8 @@ var _ http.Handler = (*Server)(nil)
 func (s *Server) ServeHTTP(w http.ResponseWriter, r *http.Request) {
 	st, err := transport.NewServerHandlerTransport(w, r, s.opts.statsHandlers)
 	if err != nil {
-		http.Error(w, err.Error(), http.StatusInternalServerError)
+		// Errors returned from transport.NewServerHandlerTransport have
+		// already been written to w.
 		return
 	}
 	if !s.addConn(listenerAddressForServeHTTP, st) {
@@ -1019,13 +1038,13 @@ func (s *Server) addConn(addr string, st transport.ServerTransport) bool {
 	s.mu.Lock()
 	defer s.mu.Unlock()
 	if s.conns == nil {
-		st.Close()
+		st.Close(errors.New("Server.addConn called when server has already been stopped"))
 		return false
 	}
 	if s.drain {
 		// Transport added after we drained our existing conns: drain it
 		// immediately.
-		st.Drain()
+		st.Drain("")
 	}
 
 	if s.conns[addr] == nil {
@@ -1123,21 +1142,16 @@ func chainUnaryServerInterceptors(s *Server) {
 
 func chainUnaryInterceptors(interceptors []UnaryServerInterceptor) UnaryServerInterceptor {
 	return func(ctx context.Context, req interface{}, info *UnaryServerInfo, handler UnaryHandler) (interface{}, error) {
-		// the struct ensures the variables are allocated together, rather than separately, since we
-		// know they should be garbage collected together. This saves 1 allocation and decreases
-		// time/call by about 10% on the microbenchmark.
-		var state struct {
-			i    int
-			next UnaryHandler
-		}
-		state.next = func(ctx context.Context, req interface{}) (interface{}, error) {
-			if state.i == len(interceptors)-1 {
-				return interceptors[state.i](ctx, req, info, handler)
-			}
-			state.i++
-			return interceptors[state.i-1](ctx, req, info, state.next)
-		}
-		return state.next(ctx, req)
+		return interceptors[0](ctx, req, info, getChainUnaryHandler(interceptors, 0, info, handler))
+	}
+}
+
+func getChainUnaryHandler(interceptors []UnaryServerInterceptor, curr int, info *UnaryServerInfo, finalHandler UnaryHandler) UnaryHandler {
+	if curr == len(interceptors)-1 {
+		return finalHandler
+	}
+	return func(ctx context.Context, req interface{}) (interface{}, error) {
+		return interceptors[curr+1](ctx, req, info, getChainUnaryHandler(interceptors, curr+1, info, finalHandler))
 	}
 }
 
@@ -1199,9 +1213,16 @@ func (s *Server) processUnaryRPC(t transport.ServerTransport, stream *transport.
 			}
 		}()
 	}
-
-	binlog := binarylog.GetMethodLogger(stream.Method())
-	if binlog != nil {
+	var binlogs []binarylog.MethodLogger
+	if ml := binarylog.GetMethodLogger(stream.Method()); ml != nil {
+		binlogs = append(binlogs, ml)
+	}
+	if s.opts.binaryLogger != nil {
+		if ml := s.opts.binaryLogger.GetMethodLogger(stream.Method()); ml != nil {
+			binlogs = append(binlogs, ml)
+		}
+	}
+	if len(binlogs) != 0 {
 		ctx := stream.Context()
 		md, _ := metadata.FromIncomingContext(ctx)
 		logEntry := &binarylog.ClientHeader{
@@ -1221,7 +1242,9 @@ func (s *Server) processUnaryRPC(t transport.ServerTransport, stream *transport.
 		if peer, ok := peer.FromContext(ctx); ok {
 			logEntry.PeerAddr = peer.Addr
 		}
-		binlog.Log(logEntry)
+		for _, binlog := range binlogs {
+			binlog.Log(ctx, logEntry)
+		}
 	}
 
 	// comp and cp are used for compression.  decomp and dc are used for
@@ -1231,6 +1254,7 @@ func (s *Server) processUnaryRPC(t transport.ServerTransport, stream *transport.
 	var comp, decomp encoding.Compressor
 	var cp Compressor
 	var dc Decompressor
+	var sendCompressorName string
 
 	// If dc is set and matches the stream's compression, use it.  Otherwise, try
 	// to find a matching registered compressor for decomp.
@@ -1251,23 +1275,29 @@ func (s *Server) processUnaryRPC(t transport.ServerTransport, stream *transport.
 	// NOTE: this needs to be ahead of all handling, https://github.com/grpc/grpc-go/issues/686.
 	if s.opts.cp != nil {
 		cp = s.opts.cp
-		stream.SetSendCompress(cp.Type())
+		sendCompressorName = cp.Type()
 	} else if rc := stream.RecvCompress(); rc != "" && rc != encoding.Identity {
 		// Legacy compressor not specified; attempt to respond with same encoding.
 		comp = encoding.GetCompressor(rc)
 		if comp != nil {
-			stream.SetSendCompress(rc)
+			sendCompressorName = comp.Name()
+		}
+	}
+
+	if sendCompressorName != "" {
+		if err := stream.SetSendCompress(sendCompressorName); err != nil {
+			return status.Errorf(codes.Internal, "grpc: failed to set send compressor: %v", err)
 		}
 	}
 
 	var payInfo *payloadInfo
-	if len(shs) != 0 || binlog != nil {
+	if len(shs) != 0 || len(binlogs) != 0 {
 		payInfo = &payloadInfo{}
 	}
 	d, err := recvAndDecompress(&parser{r: stream}, stream, dc, s.opts.maxReceiveMessageSize, payInfo, decomp)
 	if err != nil {
 		if e := t.WriteStatus(stream, status.Convert(err)); e != nil {
-			channelz.Warningf(logger, s.channelzID, "grpc: Server.processUnaryRPC failed to write status %v", e)
+			channelz.Warningf(logger, s.channelzID, "grpc: Server.processUnaryRPC failed to write status: %v", e)
 		}
 		return err
 	}
@@ -1280,17 +1310,21 @@ func (s *Server) processUnaryRPC(t transport.ServerTransport, stream *transport.
 		}
 		for _, sh := range shs {
 			sh.HandleRPC(stream.Context(), &stats.InPayload{
-				RecvTime:   time.Now(),
-				Payload:    v,
-				WireLength: payInfo.wireLength + headerLen,
-				Data:       d,
-				Length:     len(d),
+				RecvTime:         time.Now(),
+				Payload:          v,
+				Length:           len(d),
+				WireLength:       payInfo.compressedLength + headerLen,
+				CompressedLength: payInfo.compressedLength,
+				Data:             d,
 			})
 		}
-		if binlog != nil {
-			binlog.Log(&binarylog.ClientMessage{
+		if len(binlogs) != 0 {
+			cm := &binarylog.ClientMessage{
 				Message: d,
-			})
+			}
+			for _, binlog := range binlogs {
+				binlog.Log(stream.Context(), cm)
+			}
 		}
 		if trInfo != nil {
 			trInfo.tr.LazyLog(&payload{sent: false, msg: v}, true)
@@ -1314,18 +1348,24 @@ func (s *Server) processUnaryRPC(t transport.ServerTransport, stream *transport.
 		if e := t.WriteStatus(stream, appStatus); e != nil {
 			channelz.Warningf(logger, s.channelzID, "grpc: Server.processUnaryRPC failed to write status: %v", e)
 		}
-		if binlog != nil {
+		if len(binlogs) != 0 {
 			if h, _ := stream.Header(); h.Len() > 0 {
 				// Only log serverHeader if there was header. Otherwise it can
 				// be trailer only.
-				binlog.Log(&binarylog.ServerHeader{
+				sh := &binarylog.ServerHeader{
 					Header: h,
-				})
+				}
+				for _, binlog := range binlogs {
+					binlog.Log(stream.Context(), sh)
+				}
 			}
-			binlog.Log(&binarylog.ServerTrailer{
+			st := &binarylog.ServerTrailer{
 				Trailer: stream.Trailer(),
 				Err:     appErr,
-			})
+			}
+			for _, binlog := range binlogs {
+				binlog.Log(stream.Context(), st)
+			}
 		}
 		return appErr
 	}
@@ -1334,6 +1374,11 @@ func (s *Server) processUnaryRPC(t transport.ServerTransport, stream *transport.
 	}
 	opts := &transport.Options{Last: true}
 
+	// Server handler could have set new compressor by calling SetSendCompressor.
+	// In case it is set, we need to use it for compressing outbound message.
+	if stream.SendCompress() != sendCompressorName {
+		comp = encoding.GetCompressor(stream.SendCompress())
+	}
 	if err := s.sendResponse(t, stream, reply, cp, opts, comp); err != nil {
 		if err == io.EOF {
 			// The entire stream is done (for unary RPC only).
@@ -1351,26 +1396,34 @@ func (s *Server) processUnaryRPC(t transport.ServerTransport, stream *transport.
 				panic(fmt.Sprintf("grpc: Unexpected error (%T) from sendResponse: %v", st, st))
 			}
 		}
-		if binlog != nil {
+		if len(binlogs) != 0 {
 			h, _ := stream.Header()
-			binlog.Log(&binarylog.ServerHeader{
+			sh := &binarylog.ServerHeader{
 				Header: h,
-			})
-			binlog.Log(&binarylog.ServerTrailer{
+			}
+			st := &binarylog.ServerTrailer{
 				Trailer: stream.Trailer(),
 				Err:     appErr,
-			})
+			}
+			for _, binlog := range binlogs {
+				binlog.Log(stream.Context(), sh)
+				binlog.Log(stream.Context(), st)
+			}
 		}
 		return err
 	}
-	if binlog != nil {
+	if len(binlogs) != 0 {
 		h, _ := stream.Header()
-		binlog.Log(&binarylog.ServerHeader{
+		sh := &binarylog.ServerHeader{
 			Header: h,
-		})
-		binlog.Log(&binarylog.ServerMessage{
+		}
+		sm := &binarylog.ServerMessage{
 			Message: reply,
-		})
+		}
+		for _, binlog := range binlogs {
+			binlog.Log(stream.Context(), sh)
+			binlog.Log(stream.Context(), sm)
+		}
 	}
 	if channelz.IsOn() {
 		t.IncrMsgSent()
@@ -1381,14 +1434,16 @@ func (s *Server) processUnaryRPC(t transport.ServerTransport, stream *transport.
 	// TODO: Should we be logging if writing status failed here, like above?
 	// Should the logging be in WriteStatus?  Should we ignore the WriteStatus
 	// error or allow the stats handler to see it?
-	err = t.WriteStatus(stream, statusOK)
-	if binlog != nil {
-		binlog.Log(&binarylog.ServerTrailer{
+	if len(binlogs) != 0 {
+		st := &binarylog.ServerTrailer{
 			Trailer: stream.Trailer(),
 			Err:     appErr,
-		})
+		}
+		for _, binlog := range binlogs {
+			binlog.Log(stream.Context(), st)
+		}
 	}
-	return err
+	return t.WriteStatus(stream, statusOK)
 }
 
 // chainStreamServerInterceptors chains all stream server interceptors into one.
@@ -1414,21 +1469,16 @@ func chainStreamServerInterceptors(s *Server) {
 
 func chainStreamInterceptors(interceptors []StreamServerInterceptor) StreamServerInterceptor {
 	return func(srv interface{}, ss ServerStream, info *StreamServerInfo, handler StreamHandler) error {
-		// the struct ensures the variables are allocated together, rather than separately, since we
-		// know they should be garbage collected together. This saves 1 allocation and decreases
-		// time/call by about 10% on the microbenchmark.
-		var state struct {
-			i    int
-			next StreamHandler
-		}
-		state.next = func(srv interface{}, ss ServerStream) error {
-			if state.i == len(interceptors)-1 {
-				return interceptors[state.i](srv, ss, info, handler)
-			}
-			state.i++
-			return interceptors[state.i-1](srv, ss, info, state.next)
-		}
-		return state.next(srv, ss)
+		return interceptors[0](srv, ss, info, getChainStreamHandler(interceptors, 0, info, handler))
+	}
+}
+
+func getChainStreamHandler(interceptors []StreamServerInterceptor, curr int, info *StreamServerInfo, finalHandler StreamHandler) StreamHandler {
+	if curr == len(interceptors)-1 {
+		return finalHandler
+	}
+	return func(srv interface{}, stream ServerStream) error {
+		return interceptors[curr+1](srv, stream, info, getChainStreamHandler(interceptors, curr+1, info, finalHandler))
 	}
 }
 
@@ -1499,8 +1549,15 @@ func (s *Server) processStreamingRPC(t transport.ServerTransport, stream *transp
 		}()
 	}
 
-	ss.binlog = binarylog.GetMethodLogger(stream.Method())
-	if ss.binlog != nil {
+	if ml := binarylog.GetMethodLogger(stream.Method()); ml != nil {
+		ss.binlogs = append(ss.binlogs, ml)
+	}
+	if s.opts.binaryLogger != nil {
+		if ml := s.opts.binaryLogger.GetMethodLogger(stream.Method()); ml != nil {
+			ss.binlogs = append(ss.binlogs, ml)
+		}
+	}
+	if len(ss.binlogs) != 0 {
 		md, _ := metadata.FromIncomingContext(ctx)
 		logEntry := &binarylog.ClientHeader{
 			Header:     md,
@@ -1519,7 +1576,9 @@ func (s *Server) processStreamingRPC(t transport.ServerTransport, stream *transp
 		if peer, ok := peer.FromContext(ss.Context()); ok {
 			logEntry.PeerAddr = peer.Addr
 		}
-		ss.binlog.Log(logEntry)
+		for _, binlog := range ss.binlogs {
+			binlog.Log(stream.Context(), logEntry)
+		}
 	}
 
 	// If dc is set and matches the stream's compression, use it.  Otherwise, try
@@ -1541,12 +1600,18 @@ func (s *Server) processStreamingRPC(t transport.ServerTransport, stream *transp
 	// NOTE: this needs to be ahead of all handling, https://github.com/grpc/grpc-go/issues/686.
 	if s.opts.cp != nil {
 		ss.cp = s.opts.cp
-		stream.SetSendCompress(s.opts.cp.Type())
+		ss.sendCompressorName = s.opts.cp.Type()
 	} else if rc := stream.RecvCompress(); rc != "" && rc != encoding.Identity {
 		// Legacy compressor not specified; attempt to respond with same encoding.
 		ss.comp = encoding.GetCompressor(rc)
 		if ss.comp != nil {
-			stream.SetSendCompress(rc)
+			ss.sendCompressorName = rc
+		}
+	}
+
+	if ss.sendCompressorName != "" {
+		if err := stream.SetSendCompress(ss.sendCompressorName); err != nil {
+			return status.Errorf(codes.Internal, "grpc: failed to set send compressor: %v", err)
 		}
 	}
 
@@ -1584,13 +1649,16 @@ func (s *Server) processStreamingRPC(t transport.ServerTransport, stream *transp
 			ss.trInfo.tr.SetError()
 			ss.mu.Unlock()
 		}
-		t.WriteStatus(ss.s, appStatus)
-		if ss.binlog != nil {
-			ss.binlog.Log(&binarylog.ServerTrailer{
+		if len(ss.binlogs) != 0 {
+			st := &binarylog.ServerTrailer{
 				Trailer: ss.s.Trailer(),
 				Err:     appErr,
-			})
+			}
+			for _, binlog := range ss.binlogs {
+				binlog.Log(stream.Context(), st)
+			}
 		}
+		t.WriteStatus(ss.s, appStatus)
 		// TODO: Should we log an error from WriteStatus here and below?
 		return appErr
 	}
@@ -1599,14 +1667,16 @@ func (s *Server) processStreamingRPC(t transport.ServerTransport, stream *transp
 		ss.trInfo.tr.LazyLog(stringer("OK"), false)
 		ss.mu.Unlock()
 	}
-	err = t.WriteStatus(ss.s, statusOK)
-	if ss.binlog != nil {
-		ss.binlog.Log(&binarylog.ServerTrailer{
+	if len(ss.binlogs) != 0 {
+		st := &binarylog.ServerTrailer{
 			Trailer: ss.s.Trailer(),
 			Err:     appErr,
-		})
+		}
+		for _, binlog := range ss.binlogs {
+			binlog.Log(stream.Context(), st)
+		}
 	}
-	return err
+	return t.WriteStatus(ss.s, statusOK)
 }
 
 func (s *Server) handleStream(t transport.ServerTransport, stream *transport.Stream, trInfo *traceInfo) {
@@ -1748,7 +1818,7 @@ func (s *Server) Stop() {
 	}
 	for _, cs := range conns {
 		for st := range cs {
-			st.Close()
+			st.Close(errors.New("Server.Stop called"))
 		}
 	}
 	if s.opts.numServerWorkers > 0 {
@@ -1784,7 +1854,7 @@ func (s *Server) GracefulStop() {
 	if !s.drain {
 		for _, conns := range s.conns {
 			for st := range conns {
-				st.Drain()
+				st.Drain("graceful_stop")
 			}
 		}
 		s.drain = true
@@ -1873,6 +1943,60 @@ func SendHeader(ctx context.Context, md metadata.MD) error {
 	return nil
 }
 
+// SetSendCompressor sets a compressor for outbound messages from the server.
+// It must not be called after any event that causes headers to be sent
+// (see ServerStream.SetHeader for the complete list). Provided compressor is
+// used when below conditions are met:
+//
+//   - compressor is registered via encoding.RegisterCompressor
+//   - compressor name must exist in the client advertised compressor names
+//     sent in grpc-accept-encoding header. Use ClientSupportedCompressors to
+//     get client supported compressor names.
+//
+// The context provided must be the context passed to the server's handler.
+// It must be noted that compressor name encoding.Identity disables the
+// outbound compression.
+// By default, server messages will be sent using the same compressor with
+// which request messages were sent.
+//
+// It is not safe to call SetSendCompressor concurrently with SendHeader and
+// SendMsg.
+//
+// # Experimental
+//
+// Notice: This function is EXPERIMENTAL and may be changed or removed in a
+// later release.
+func SetSendCompressor(ctx context.Context, name string) error {
+	stream, ok := ServerTransportStreamFromContext(ctx).(*transport.Stream)
+	if !ok || stream == nil {
+		return fmt.Errorf("failed to fetch the stream from the given context")
+	}
+
+	if err := validateSendCompressor(name, stream.ClientAdvertisedCompressors()); err != nil {
+		return fmt.Errorf("unable to set send compressor: %w", err)
+	}
+
+	return stream.SetSendCompress(name)
+}
+
+// ClientSupportedCompressors returns compressor names advertised by the client
+// via grpc-accept-encoding header.
+//
+// The context provided must be the context passed to the server's handler.
+//
+// # Experimental
+//
+// Notice: This function is EXPERIMENTAL and may be changed or removed in a
+// later release.
+func ClientSupportedCompressors(ctx context.Context) ([]string, error) {
+	stream, ok := ServerTransportStreamFromContext(ctx).(*transport.Stream)
+	if !ok || stream == nil {
+		return nil, fmt.Errorf("failed to fetch the stream from the given context %v", ctx)
+	}
+
+	return strings.Split(stream.ClientAdvertisedCompressors(), ","), nil
+}
+
 // SetTrailer sets the trailer metadata that will be sent when an RPC returns.
 // When called more than once, all the provided metadata will be merged.
 //
@@ -1907,3 +2031,51 @@ type channelzServer struct {
 func (c *channelzServer) ChannelzMetric() *channelz.ServerInternalMetric {
 	return c.s.channelzMetric()
 }
+
+// validateSendCompressor returns an error when given compressor name cannot be
+// handled by the server or the client based on the advertised compressors.
+func validateSendCompressor(name, clientCompressors string) error {
+	if name == encoding.Identity {
+		return nil
+	}
+
+	if !grpcutil.IsCompressorNameRegistered(name) {
+		return fmt.Errorf("compressor not registered %q", name)
+	}
+
+	for _, c := range strings.Split(clientCompressors, ",") {
+		if c == name {
+			return nil // found match
+		}
+	}
+	return fmt.Errorf("client does not support compressor %q", name)
+}
+
+// atomicSemaphore implements a blocking, counting semaphore. acquire should be
+// called synchronously; release may be called asynchronously.
+type atomicSemaphore struct {
+	n    int64
+	wait chan struct{}
+}
+
+func (q *atomicSemaphore) acquire() {
+	if atomic.AddInt64(&q.n, -1) < 0 {
+		// We ran out of quota.  Block until a release happens.
+		<-q.wait
+	}
+}
+
+func (q *atomicSemaphore) release() {
+	// N.B. the "<= 0" check below should allow for this to work with multiple
+	// concurrent calls to acquire, but also note that with synchronous calls to
+	// acquire, as our system does, n will never be less than -1.  There are
+	// fairness issues (queuing) to consider if this was to be generalized.
+	if atomic.AddInt64(&q.n, 1) <= 0 {
+		// An acquire was waiting on us.  Unblock it.
+		q.wait <- struct{}{}
+	}
+}
+
+func newHandlerQuota(n uint32) *atomicSemaphore {
+	return &atomicSemaphore{n: int64(n), wait: make(chan struct{}, 1)}
+}
diff --git a/vendor/google.golang.org/grpc/service_config.go b/vendor/google.golang.org/grpc/service_config.go
index 01bbb2025..0df11fc09 100644
--- a/vendor/google.golang.org/grpc/service_config.go
+++ b/vendor/google.golang.org/grpc/service_config.go
@@ -23,8 +23,6 @@ import (
 	"errors"
 	"fmt"
 	"reflect"
-	"strconv"
-	"strings"
 	"time"
 
 	"google.golang.org/grpc/codes"
@@ -106,8 +104,8 @@ type healthCheckConfig struct {
 
 type jsonRetryPolicy struct {
 	MaxAttempts          int
-	InitialBackoff       string
-	MaxBackoff           string
+	InitialBackoff       internalserviceconfig.Duration
+	MaxBackoff           internalserviceconfig.Duration
 	BackoffMultiplier    float64
 	RetryableStatusCodes []codes.Code
 }
@@ -129,50 +127,6 @@ type retryThrottlingPolicy struct {
 	TokenRatio float64
 }
 
-func parseDuration(s *string) (*time.Duration, error) {
-	if s == nil {
-		return nil, nil
-	}
-	if !strings.HasSuffix(*s, "s") {
-		return nil, fmt.Errorf("malformed duration %q", *s)
-	}
-	ss := strings.SplitN((*s)[:len(*s)-1], ".", 3)
-	if len(ss) > 2 {
-		return nil, fmt.Errorf("malformed duration %q", *s)
-	}
-	// hasDigits is set if either the whole or fractional part of the number is
-	// present, since both are optional but one is required.
-	hasDigits := false
-	var d time.Duration
-	if len(ss[0]) > 0 {
-		i, err := strconv.ParseInt(ss[0], 10, 32)
-		if err != nil {
-			return nil, fmt.Errorf("malformed duration %q: %v", *s, err)
-		}
-		d = time.Duration(i) * time.Second
-		hasDigits = true
-	}
-	if len(ss) == 2 && len(ss[1]) > 0 {
-		if len(ss[1]) > 9 {
-			return nil, fmt.Errorf("malformed duration %q", *s)
-		}
-		f, err := strconv.ParseInt(ss[1], 10, 64)
-		if err != nil {
-			return nil, fmt.Errorf("malformed duration %q: %v", *s, err)
-		}
-		for i := 9; i > len(ss[1]); i-- {
-			f *= 10
-		}
-		d += time.Duration(f)
-		hasDigits = true
-	}
-	if !hasDigits {
-		return nil, fmt.Errorf("malformed duration %q", *s)
-	}
-
-	return &d, nil
-}
-
 type jsonName struct {
 	Service string
 	Method  string
@@ -201,7 +155,7 @@ func (j jsonName) generatePath() (string, error) {
 type jsonMC struct {
 	Name                    *[]jsonName
 	WaitForReady            *bool
-	Timeout                 *string
+	Timeout                 *internalserviceconfig.Duration
 	MaxRequestMessageBytes  *int64
 	MaxResponseMessageBytes *int64
 	RetryPolicy             *jsonRetryPolicy
@@ -226,7 +180,7 @@ func parseServiceConfig(js string) *serviceconfig.ParseResult {
 	var rsc jsonSC
 	err := json.Unmarshal([]byte(js), &rsc)
 	if err != nil {
-		logger.Warningf("grpc: parseServiceConfig error unmarshaling %s due to %v", js, err)
+		logger.Warningf("grpc: unmarshaling service config %s: %v", js, err)
 		return &serviceconfig.ParseResult{Err: err}
 	}
 	sc := ServiceConfig{
@@ -252,18 +206,13 @@ func parseServiceConfig(js string) *serviceconfig.ParseResult {
 		if m.Name == nil {
 			continue
 		}
-		d, err := parseDuration(m.Timeout)
-		if err != nil {
-			logger.Warningf("grpc: parseServiceConfig error unmarshaling %s due to %v", js, err)
-			return &serviceconfig.ParseResult{Err: err}
-		}
 
 		mc := MethodConfig{
 			WaitForReady: m.WaitForReady,
-			Timeout:      d,
+			Timeout:      (*time.Duration)(m.Timeout),
 		}
 		if mc.RetryPolicy, err = convertRetryPolicy(m.RetryPolicy); err != nil {
-			logger.Warningf("grpc: parseServiceConfig error unmarshaling %s due to %v", js, err)
+			logger.Warningf("grpc: unmarshaling service config %s: %v", js, err)
 			return &serviceconfig.ParseResult{Err: err}
 		}
 		if m.MaxRequestMessageBytes != nil {
@@ -283,13 +232,13 @@ func parseServiceConfig(js string) *serviceconfig.ParseResult {
 		for i, n := range *m.Name {
 			path, err := n.generatePath()
 			if err != nil {
-				logger.Warningf("grpc: parseServiceConfig error unmarshaling %s due to methodConfig[%d]: %v", js, i, err)
+				logger.Warningf("grpc: error unmarshaling service config %s due to methodConfig[%d]: %v", js, i, err)
 				return &serviceconfig.ParseResult{Err: err}
 			}
 
 			if _, ok := paths[path]; ok {
 				err = errDuplicatedName
-				logger.Warningf("grpc: parseServiceConfig error unmarshaling %s due to methodConfig[%d]: %v", js, i, err)
+				logger.Warningf("grpc: error unmarshaling service config %s due to methodConfig[%d]: %v", js, i, err)
 				return &serviceconfig.ParseResult{Err: err}
 			}
 			paths[path] = struct{}{}
@@ -312,18 +261,10 @@ func convertRetryPolicy(jrp *jsonRetryPolicy) (p *internalserviceconfig.RetryPol
 	if jrp == nil {
 		return nil, nil
 	}
-	ib, err := parseDuration(&jrp.InitialBackoff)
-	if err != nil {
-		return nil, err
-	}
-	mb, err := parseDuration(&jrp.MaxBackoff)
-	if err != nil {
-		return nil, err
-	}
 
 	if jrp.MaxAttempts <= 1 ||
-		*ib <= 0 ||
-		*mb <= 0 ||
+		jrp.InitialBackoff <= 0 ||
+		jrp.MaxBackoff <= 0 ||
 		jrp.BackoffMultiplier <= 0 ||
 		len(jrp.RetryableStatusCodes) == 0 {
 		logger.Warningf("grpc: ignoring retry policy %v due to illegal configuration", jrp)
@@ -332,8 +273,8 @@ func convertRetryPolicy(jrp *jsonRetryPolicy) (p *internalserviceconfig.RetryPol
 
 	rp := &internalserviceconfig.RetryPolicy{
 		MaxAttempts:          jrp.MaxAttempts,
-		InitialBackoff:       *ib,
-		MaxBackoff:           *mb,
+		InitialBackoff:       time.Duration(jrp.InitialBackoff),
+		MaxBackoff:           time.Duration(jrp.MaxBackoff),
 		BackoffMultiplier:    jrp.BackoffMultiplier,
 		RetryableStatusCodes: make(map[codes.Code]bool),
 	}
diff --git a/vendor/google.golang.org/grpc/serviceconfig/serviceconfig.go b/vendor/google.golang.org/grpc/serviceconfig/serviceconfig.go
index 73a2f9266..35e7a20a0 100644
--- a/vendor/google.golang.org/grpc/serviceconfig/serviceconfig.go
+++ b/vendor/google.golang.org/grpc/serviceconfig/serviceconfig.go
@@ -19,7 +19,7 @@
 // Package serviceconfig defines types and methods for operating on gRPC
 // service configs.
 //
-// Experimental
+// # Experimental
 //
 // Notice: This package is EXPERIMENTAL and may be changed or removed in a
 // later release.
diff --git a/vendor/google.golang.org/grpc/stats/stats.go b/vendor/google.golang.org/grpc/stats/stats.go
index 0285dcc6a..7a552a9b7 100644
--- a/vendor/google.golang.org/grpc/stats/stats.go
+++ b/vendor/google.golang.org/grpc/stats/stats.go
@@ -67,10 +67,18 @@ type InPayload struct {
 	Payload interface{}
 	// Data is the serialized message payload.
 	Data []byte
-	// Length is the length of uncompressed data.
+
+	// Length is the size of the uncompressed payload data. Does not include any
+	// framing (gRPC or HTTP/2).
 	Length int
-	// WireLength is the length of data on wire (compressed, signed, encrypted).
+	// CompressedLength is the size of the compressed payload data. Does not
+	// include any framing (gRPC or HTTP/2). Same as Length if compression not
+	// enabled.
+	CompressedLength int
+	// WireLength is the size of the compressed payload data plus gRPC framing.
+	// Does not include HTTP/2 framing.
 	WireLength int
+
 	// RecvTime is the time when the payload is received.
 	RecvTime time.Time
 }
@@ -129,9 +137,15 @@ type OutPayload struct {
 	Payload interface{}
 	// Data is the serialized message payload.
 	Data []byte
-	// Length is the length of uncompressed data.
+	// Length is the size of the uncompressed payload data. Does not include any
+	// framing (gRPC or HTTP/2).
 	Length int
-	// WireLength is the length of data on wire (compressed, signed, encrypted).
+	// CompressedLength is the size of the compressed payload data. Does not
+	// include any framing (gRPC or HTTP/2). Same as Length if compression not
+	// enabled.
+	CompressedLength int
+	// WireLength is the size of the compressed payload data plus gRPC framing.
+	// Does not include HTTP/2 framing.
 	WireLength int
 	// SentTime is the time when the payload is sent.
 	SentTime time.Time
diff --git a/vendor/google.golang.org/grpc/status/status.go b/vendor/google.golang.org/grpc/status/status.go
index 6d163b6e3..bcf2e4d81 100644
--- a/vendor/google.golang.org/grpc/status/status.go
+++ b/vendor/google.golang.org/grpc/status/status.go
@@ -76,22 +76,50 @@ func FromProto(s *spb.Status) *Status {
 
 // FromError returns a Status representation of err.
 //
-// - If err was produced by this package or implements the method `GRPCStatus()
-//   *Status`, the appropriate Status is returned.
+//   - If err was produced by this package or implements the method `GRPCStatus()
+//     *Status` and `GRPCStatus()` does not return nil, or if err wraps a type
+//     satisfying this, the Status from `GRPCStatus()` is returned.  For wrapped
+//     errors, the message returned contains the entire err.Error() text and not
+//     just the wrapped status. In that case, ok is true.
 //
-// - If err is nil, a Status is returned with codes.OK and no message.
+//   - If err is nil, a Status is returned with codes.OK and no message, and ok
+//     is true.
 //
-// - Otherwise, err is an error not compatible with this package.  In this
-//   case, a Status is returned with codes.Unknown and err's Error() message,
-//   and ok is false.
+//   - If err implements the method `GRPCStatus() *Status` and `GRPCStatus()`
+//     returns nil (which maps to Codes.OK), or if err wraps a type
+//     satisfying this, a Status is returned with codes.Unknown and err's
+//     Error() message, and ok is false.
+//
+//   - Otherwise, err is an error not compatible with this package.  In this
+//     case, a Status is returned with codes.Unknown and err's Error() message,
+//     and ok is false.
 func FromError(err error) (s *Status, ok bool) {
 	if err == nil {
 		return nil, true
 	}
-	if se, ok := err.(interface {
-		GRPCStatus() *Status
-	}); ok {
-		return se.GRPCStatus(), true
+	type grpcstatus interface{ GRPCStatus() *Status }
+	if gs, ok := err.(grpcstatus); ok {
+		if gs.GRPCStatus() == nil {
+			// Error has status nil, which maps to codes.OK. There
+			// is no sensible behavior for this, so we turn it into
+			// an error with codes.Unknown and discard the existing
+			// status.
+			return New(codes.Unknown, err.Error()), false
+		}
+		return gs.GRPCStatus(), true
+	}
+	var gs grpcstatus
+	if errors.As(err, &gs) {
+		if gs.GRPCStatus() == nil {
+			// Error wraps an error that has status nil, which maps
+			// to codes.OK.  There is no sensible behavior for this,
+			// so we turn it into an error with codes.Unknown and
+			// discard the existing status.
+			return New(codes.Unknown, err.Error()), false
+		}
+		p := gs.GRPCStatus().Proto()
+		p.Message = err.Error()
+		return status.FromProto(p), true
 	}
 	return New(codes.Unknown, err.Error()), false
 }
@@ -103,19 +131,16 @@ func Convert(err error) *Status {
 	return s
 }
 
-// Code returns the Code of the error if it is a Status error, codes.OK if err
-// is nil, or codes.Unknown otherwise.
+// Code returns the Code of the error if it is a Status error or if it wraps a
+// Status error. If that is not the case, it returns codes.OK if err is nil, or
+// codes.Unknown otherwise.
 func Code(err error) codes.Code {
 	// Don't use FromError to avoid allocation of OK status.
 	if err == nil {
 		return codes.OK
 	}
-	if se, ok := err.(interface {
-		GRPCStatus() *Status
-	}); ok {
-		return se.GRPCStatus().Code()
-	}
-	return codes.Unknown
+
+	return Convert(err).Code()
 }
 
 // FromContextError converts a context error or wrapped context error into a
diff --git a/vendor/google.golang.org/grpc/stream.go b/vendor/google.golang.org/grpc/stream.go
index 446a91e32..10092685b 100644
--- a/vendor/google.golang.org/grpc/stream.go
+++ b/vendor/google.golang.org/grpc/stream.go
@@ -39,6 +39,7 @@ import (
 	imetadata "google.golang.org/grpc/internal/metadata"
 	iresolver "google.golang.org/grpc/internal/resolver"
 	"google.golang.org/grpc/internal/serviceconfig"
+	istatus "google.golang.org/grpc/internal/status"
 	"google.golang.org/grpc/internal/transport"
 	"google.golang.org/grpc/metadata"
 	"google.golang.org/grpc/peer"
@@ -122,6 +123,9 @@ type ClientStream interface {
 	// calling RecvMsg on the same stream at the same time, but it is not safe
 	// to call SendMsg on the same stream in different goroutines. It is also
 	// not safe to call CloseSend concurrently with SendMsg.
+	//
+	// It is not safe to modify the message after calling SendMsg. Tracing
+	// libraries and stats handlers may use the message lazily.
 	SendMsg(m interface{}) error
 	// RecvMsg blocks until it receives a message into m or the stream is
 	// done. It returns io.EOF when the stream completes successfully. On
@@ -151,6 +155,11 @@ type ClientStream interface {
 // If none of the above happen, a goroutine and a context will be leaked, and grpc
 // will not call the optionally-configured stats handler with a stats.End message.
 func (cc *ClientConn) NewStream(ctx context.Context, desc *StreamDesc, method string, opts ...CallOption) (ClientStream, error) {
+	if err := cc.idlenessMgr.onCallBegin(); err != nil {
+		return nil, err
+	}
+	defer cc.idlenessMgr.onCallEnd()
+
 	// allow interceptor to see all applicable call options, which means those
 	// configured as defaults from dial option as well as per-call options
 	opts = combine(cc.dopts.callOptions, opts)
@@ -167,10 +176,19 @@ func NewClientStream(ctx context.Context, desc *StreamDesc, cc *ClientConn, meth
 }
 
 func newClientStream(ctx context.Context, desc *StreamDesc, cc *ClientConn, method string, opts ...CallOption) (_ ClientStream, err error) {
-	if md, _, ok := metadata.FromOutgoingContextRaw(ctx); ok {
+	if md, added, ok := metadata.FromOutgoingContextRaw(ctx); ok {
+		// validate md
 		if err := imetadata.Validate(md); err != nil {
 			return nil, status.Error(codes.Internal, err.Error())
 		}
+		// validate added
+		for _, kvs := range added {
+			for i := 0; i < len(kvs); i += 2 {
+				if err := imetadata.ValidatePair(kvs[i], kvs[i+1]); err != nil {
+					return nil, status.Error(codes.Internal, err.Error())
+				}
+			}
+		}
 	}
 	if channelz.IsOn() {
 		cc.incrCallsStarted()
@@ -195,6 +213,13 @@ func newClientStream(ctx context.Context, desc *StreamDesc, cc *ClientConn, meth
 	rpcInfo := iresolver.RPCInfo{Context: ctx, Method: method}
 	rpcConfig, err := cc.safeConfigSelector.SelectConfig(rpcInfo)
 	if err != nil {
+		if st, ok := status.FromError(err); ok {
+			// Restrict the code to the list allowed by gRFC A54.
+			if istatus.IsRestrictedControlPlaneCode(st) {
+				err = status.Errorf(codes.Internal, "config selector returned illegal status: %v", err)
+			}
+			return nil, err
+		}
 		return nil, toRPCErr(err)
 	}
 
@@ -301,7 +326,14 @@ func newClientStreamWithParams(ctx context.Context, desc *StreamDesc, cc *Client
 	if !cc.dopts.disableRetry {
 		cs.retryThrottler = cc.retryThrottler.Load().(*retryThrottler)
 	}
-	cs.binlog = binarylog.GetMethodLogger(method)
+	if ml := binarylog.GetMethodLogger(method); ml != nil {
+		cs.binlogs = append(cs.binlogs, ml)
+	}
+	if cc.dopts.binaryLogger != nil {
+		if ml := cc.dopts.binaryLogger.GetMethodLogger(method); ml != nil {
+			cs.binlogs = append(cs.binlogs, ml)
+		}
+	}
 
 	// Pick the transport to use and create a new stream on the transport.
 	// Assign cs.attempt upon success.
@@ -322,7 +354,7 @@ func newClientStreamWithParams(ctx context.Context, desc *StreamDesc, cc *Client
 		return nil, err
 	}
 
-	if cs.binlog != nil {
+	if len(cs.binlogs) != 0 {
 		md, _ := metadata.FromOutgoingContext(ctx)
 		logEntry := &binarylog.ClientHeader{
 			OnClientSide: true,
@@ -336,7 +368,9 @@ func newClientStreamWithParams(ctx context.Context, desc *StreamDesc, cc *Client
 				logEntry.Timeout = 0
 			}
 		}
-		cs.binlog.Log(logEntry)
+		for _, binlog := range cs.binlogs {
+			binlog.Log(cs.ctx, logEntry)
+		}
 	}
 
 	if desc != unaryStreamDesc {
@@ -399,7 +433,7 @@ func (cs *clientStream) newAttemptLocked(isTransparent bool) (*csAttempt, error)
 		ctx = trace.NewContext(ctx, trInfo.tr)
 	}
 
-	if cs.cc.parsedTarget.Scheme == "xds" {
+	if cs.cc.parsedTarget.URL.Scheme == "xds" {
 		// Add extra metadata (metadata that will be added by transport) to context
 		// so the balancer can see them.
 		ctx = grpcutil.WithExtraMetadata(ctx, metadata.Pairs(
@@ -421,7 +455,7 @@ func (a *csAttempt) getTransport() error {
 	cs := a.cs
 
 	var err error
-	a.t, a.done, err = cs.cc.getTransport(a.ctx, cs.callInfo.failFast, cs.callHdr.Method)
+	a.t, a.pickResult, err = cs.cc.getTransport(a.ctx, cs.callInfo.failFast, cs.callHdr.Method)
 	if err != nil {
 		if de, ok := err.(dropError); ok {
 			err = de.error
@@ -438,6 +472,25 @@ func (a *csAttempt) getTransport() error {
 func (a *csAttempt) newStream() error {
 	cs := a.cs
 	cs.callHdr.PreviousAttempts = cs.numRetries
+
+	// Merge metadata stored in PickResult, if any, with existing call metadata.
+	// It is safe to overwrite the csAttempt's context here, since all state
+	// maintained in it are local to the attempt. When the attempt has to be
+	// retried, a new instance of csAttempt will be created.
+	if a.pickResult.Metadata != nil {
+		// We currently do not have a function it the metadata package which
+		// merges given metadata with existing metadata in a context. Existing
+		// function `AppendToOutgoingContext()` takes a variadic argument of key
+		// value pairs.
+		//
+		// TODO: Make it possible to retrieve key value pairs from metadata.MD
+		// in a form passable to AppendToOutgoingContext(), or create a version
+		// of AppendToOutgoingContext() that accepts a metadata.MD.
+		md, _ := metadata.FromOutgoingContext(a.ctx)
+		md = metadata.Join(md, a.pickResult.Metadata)
+		a.ctx = metadata.NewOutgoingContext(a.ctx, md)
+	}
+
 	s, err := a.t.NewStream(a.ctx, cs.callHdr)
 	if err != nil {
 		nse, ok := err.(*transport.NewStreamError)
@@ -480,7 +533,7 @@ type clientStream struct {
 
 	retryThrottler *retryThrottler // The throttler active when the RPC began.
 
-	binlog binarylog.MethodLogger // Binary logger, can be nil.
+	binlogs []binarylog.MethodLogger
 	// serverHeaderBinlogged is a boolean for whether server header has been
 	// logged. Server header will be logged when the first time one of those
 	// happens: stream.Header(), stream.Recv().
@@ -512,12 +565,12 @@ type clientStream struct {
 // csAttempt implements a single transport stream attempt within a
 // clientStream.
 type csAttempt struct {
-	ctx  context.Context
-	cs   *clientStream
-	t    transport.ClientTransport
-	s    *transport.Stream
-	p    *parser
-	done func(balancer.DoneInfo)
+	ctx        context.Context
+	cs         *clientStream
+	t          transport.ClientTransport
+	s          *transport.Stream
+	p          *parser
+	pickResult balancer.PickResult
 
 	finished  bool
 	dc        Decompressor
@@ -735,17 +788,25 @@ func (cs *clientStream) withRetry(op func(a *csAttempt) error, onSuccess func())
 
 func (cs *clientStream) Header() (metadata.MD, error) {
 	var m metadata.MD
+	noHeader := false
 	err := cs.withRetry(func(a *csAttempt) error {
 		var err error
 		m, err = a.s.Header()
+		if err == transport.ErrNoHeaders {
+			noHeader = true
+			return nil
+		}
 		return toRPCErr(err)
 	}, cs.commitAttemptLocked)
+
 	if err != nil {
 		cs.finish(err)
 		return nil, err
 	}
-	if cs.binlog != nil && !cs.serverHeaderBinlogged {
-		// Only log if binary log is on and header has not been logged.
+
+	if len(cs.binlogs) != 0 && !cs.serverHeaderBinlogged && !noHeader {
+		// Only log if binary log is on and header has not been logged, and
+		// there is actually headers to log.
 		logEntry := &binarylog.ServerHeader{
 			OnClientSide: true,
 			Header:       m,
@@ -754,8 +815,10 @@ func (cs *clientStream) Header() (metadata.MD, error) {
 		if peer, ok := peer.FromContext(cs.Context()); ok {
 			logEntry.PeerAddr = peer.Addr
 		}
-		cs.binlog.Log(logEntry)
 		cs.serverHeaderBinlogged = true
+		for _, binlog := range cs.binlogs {
+			binlog.Log(cs.ctx, logEntry)
+		}
 	}
 	return m, nil
 }
@@ -829,38 +892,44 @@ func (cs *clientStream) SendMsg(m interface{}) (err error) {
 		return a.sendMsg(m, hdr, payload, data)
 	}
 	err = cs.withRetry(op, func() { cs.bufferForRetryLocked(len(hdr)+len(payload), op) })
-	if cs.binlog != nil && err == nil {
-		cs.binlog.Log(&binarylog.ClientMessage{
+	if len(cs.binlogs) != 0 && err == nil {
+		cm := &binarylog.ClientMessage{
 			OnClientSide: true,
 			Message:      data,
-		})
+		}
+		for _, binlog := range cs.binlogs {
+			binlog.Log(cs.ctx, cm)
+		}
 	}
 	return err
 }
 
 func (cs *clientStream) RecvMsg(m interface{}) error {
-	if cs.binlog != nil && !cs.serverHeaderBinlogged {
+	if len(cs.binlogs) != 0 && !cs.serverHeaderBinlogged {
 		// Call Header() to binary log header if it's not already logged.
 		cs.Header()
 	}
 	var recvInfo *payloadInfo
-	if cs.binlog != nil {
+	if len(cs.binlogs) != 0 {
 		recvInfo = &payloadInfo{}
 	}
 	err := cs.withRetry(func(a *csAttempt) error {
 		return a.recvMsg(m, recvInfo)
 	}, cs.commitAttemptLocked)
-	if cs.binlog != nil && err == nil {
-		cs.binlog.Log(&binarylog.ServerMessage{
+	if len(cs.binlogs) != 0 && err == nil {
+		sm := &binarylog.ServerMessage{
 			OnClientSide: true,
 			Message:      recvInfo.uncompressedBytes,
-		})
+		}
+		for _, binlog := range cs.binlogs {
+			binlog.Log(cs.ctx, sm)
+		}
 	}
 	if err != nil || !cs.desc.ServerStreams {
 		// err != nil or non-server-streaming indicates end of stream.
 		cs.finish(err)
 
-		if cs.binlog != nil {
+		if len(cs.binlogs) != 0 {
 			// finish will not log Trailer. Log Trailer here.
 			logEntry := &binarylog.ServerTrailer{
 				OnClientSide: true,
@@ -873,7 +942,9 @@ func (cs *clientStream) RecvMsg(m interface{}) error {
 			if peer, ok := peer.FromContext(cs.Context()); ok {
 				logEntry.PeerAddr = peer.Addr
 			}
-			cs.binlog.Log(logEntry)
+			for _, binlog := range cs.binlogs {
+				binlog.Log(cs.ctx, logEntry)
+			}
 		}
 	}
 	return err
@@ -894,10 +965,13 @@ func (cs *clientStream) CloseSend() error {
 		return nil
 	}
 	cs.withRetry(op, func() { cs.bufferForRetryLocked(0, op) })
-	if cs.binlog != nil {
-		cs.binlog.Log(&binarylog.ClientHalfClose{
+	if len(cs.binlogs) != 0 {
+		chc := &binarylog.ClientHalfClose{
 			OnClientSide: true,
-		})
+		}
+		for _, binlog := range cs.binlogs {
+			binlog.Log(cs.ctx, chc)
+		}
 	}
 	// We never returned an error here for reasons.
 	return nil
@@ -914,6 +988,9 @@ func (cs *clientStream) finish(err error) {
 		return
 	}
 	cs.finished = true
+	for _, onFinish := range cs.callInfo.onFinish {
+		onFinish(err)
+	}
 	cs.commitAttemptLocked()
 	if cs.attempt != nil {
 		cs.attempt.finish(err)
@@ -930,10 +1007,13 @@ func (cs *clientStream) finish(err error) {
 	//
 	// Only one of cancel or trailer needs to be logged. In the cases where
 	// users don't call RecvMsg, users must have already canceled the RPC.
-	if cs.binlog != nil && status.Code(err) == codes.Canceled {
-		cs.binlog.Log(&binarylog.Cancel{
+	if len(cs.binlogs) != 0 && status.Code(err) == codes.Canceled {
+		c := &binarylog.Cancel{
 			OnClientSide: true,
-		})
+		}
+		for _, binlog := range cs.binlogs {
+			binlog.Log(cs.ctx, c)
+		}
 	}
 	if err == nil {
 		cs.retryThrottler.successfulRPC()
@@ -1005,6 +1085,7 @@ func (a *csAttempt) recvMsg(m interface{}, payInfo *payloadInfo) (err error) {
 			}
 			return io.EOF // indicates successful end of stream.
 		}
+
 		return toRPCErr(err)
 	}
 	if a.trInfo != nil {
@@ -1020,9 +1101,10 @@ func (a *csAttempt) recvMsg(m interface{}, payInfo *payloadInfo) (err error) {
 			RecvTime: time.Now(),
 			Payload:  m,
 			// TODO truncate large payload.
-			Data:       payInfo.uncompressedBytes,
-			WireLength: payInfo.wireLength + headerLen,
-			Length:     len(payInfo.uncompressedBytes),
+			Data:             payInfo.uncompressedBytes,
+			WireLength:       payInfo.compressedLength + headerLen,
+			CompressedLength: payInfo.compressedLength,
+			Length:           len(payInfo.uncompressedBytes),
 		})
 	}
 	if channelz.IsOn() {
@@ -1061,12 +1143,12 @@ func (a *csAttempt) finish(err error) {
 		tr = a.s.Trailer()
 	}
 
-	if a.done != nil {
+	if a.pickResult.Done != nil {
 		br := false
 		if a.s != nil {
 			br = a.s.BytesReceived()
 		}
-		a.done(balancer.DoneInfo{
+		a.pickResult.Done(balancer.DoneInfo{
 			Err:           err,
 			Trailer:       tr,
 			BytesSent:     a.s != nil,
@@ -1191,14 +1273,19 @@ func newNonRetryClientStream(ctx context.Context, desc *StreamDesc, method strin
 	as.p = &parser{r: s}
 	ac.incrCallsStarted()
 	if desc != unaryStreamDesc {
-		// Listen on cc and stream contexts to cleanup when the user closes the
-		// ClientConn or cancels the stream context.  In all other cases, an error
-		// should already be injected into the recv buffer by the transport, which
-		// the client will eventually receive, and then we will cancel the stream's
-		// context in clientStream.finish.
+		// Listen on stream context to cleanup when the stream context is
+		// canceled.  Also listen for the addrConn's context in case the
+		// addrConn is closed or reconnects to a different address.  In all
+		// other cases, an error should already be injected into the recv
+		// buffer by the transport, which the client will eventually receive,
+		// and then we will cancel the stream's context in
+		// addrConnStream.finish.
 		go func() {
+			ac.mu.Lock()
+			acCtx := ac.ctx
+			ac.mu.Unlock()
 			select {
-			case <-ac.ctx.Done():
+			case <-acCtx.Done():
 				as.finish(status.Error(codes.Canceled, "grpc: the SubConn is closing"))
 			case <-ctx.Done():
 				as.finish(toRPCErr(ctx.Err()))
@@ -1422,6 +1509,9 @@ type ServerStream interface {
 	// It is safe to have a goroutine calling SendMsg and another goroutine
 	// calling RecvMsg on the same stream at the same time, but it is not safe
 	// to call SendMsg on the same stream in different goroutines.
+	//
+	// It is not safe to modify the message after calling SendMsg. Tracing
+	// libraries and stats handlers may use the message lazily.
 	SendMsg(m interface{}) error
 	// RecvMsg blocks until it receives a message into m or the stream is
 	// done. It returns io.EOF when the client has performed a CloseSend. On
@@ -1447,13 +1537,15 @@ type serverStream struct {
 	comp   encoding.Compressor
 	decomp encoding.Compressor
 
+	sendCompressorName string
+
 	maxReceiveMessageSize int
 	maxSendMessageSize    int
 	trInfo                *traceInfo
 
 	statsHandler []stats.Handler
 
-	binlog binarylog.MethodLogger
+	binlogs []binarylog.MethodLogger
 	// serverHeaderBinlogged indicates whether server header has been logged. It
 	// will happen when one of the following two happens: stream.SendHeader(),
 	// stream.Send().
@@ -1487,12 +1579,15 @@ func (ss *serverStream) SendHeader(md metadata.MD) error {
 	}
 
 	err = ss.t.WriteHeader(ss.s, md)
-	if ss.binlog != nil && !ss.serverHeaderBinlogged {
+	if len(ss.binlogs) != 0 && !ss.serverHeaderBinlogged {
 		h, _ := ss.s.Header()
-		ss.binlog.Log(&binarylog.ServerHeader{
+		sh := &binarylog.ServerHeader{
 			Header: h,
-		})
+		}
 		ss.serverHeaderBinlogged = true
+		for _, binlog := range ss.binlogs {
+			binlog.Log(ss.ctx, sh)
+		}
 	}
 	return err
 }
@@ -1536,6 +1631,13 @@ func (ss *serverStream) SendMsg(m interface{}) (err error) {
 		}
 	}()
 
+	// Server handler could have set new compressor by calling SetSendCompressor.
+	// In case it is set, we need to use it for compressing outbound message.
+	if sendCompressorsName := ss.s.SendCompress(); sendCompressorsName != ss.sendCompressorName {
+		ss.comp = encoding.GetCompressor(sendCompressorsName)
+		ss.sendCompressorName = sendCompressorsName
+	}
+
 	// load hdr, payload, data
 	hdr, payload, data, err := prepareMsg(m, ss.codec, ss.cp, ss.comp)
 	if err != nil {
@@ -1549,17 +1651,23 @@ func (ss *serverStream) SendMsg(m interface{}) (err error) {
 	if err := ss.t.Write(ss.s, hdr, payload, &transport.Options{Last: false}); err != nil {
 		return toRPCErr(err)
 	}
-	if ss.binlog != nil {
+	if len(ss.binlogs) != 0 {
 		if !ss.serverHeaderBinlogged {
 			h, _ := ss.s.Header()
-			ss.binlog.Log(&binarylog.ServerHeader{
+			sh := &binarylog.ServerHeader{
 				Header: h,
-			})
+			}
 			ss.serverHeaderBinlogged = true
+			for _, binlog := range ss.binlogs {
+				binlog.Log(ss.ctx, sh)
+			}
 		}
-		ss.binlog.Log(&binarylog.ServerMessage{
+		sm := &binarylog.ServerMessage{
 			Message: data,
-		})
+		}
+		for _, binlog := range ss.binlogs {
+			binlog.Log(ss.ctx, sm)
+		}
 	}
 	if len(ss.statsHandler) != 0 {
 		for _, sh := range ss.statsHandler {
@@ -1598,13 +1706,16 @@ func (ss *serverStream) RecvMsg(m interface{}) (err error) {
 		}
 	}()
 	var payInfo *payloadInfo
-	if len(ss.statsHandler) != 0 || ss.binlog != nil {
+	if len(ss.statsHandler) != 0 || len(ss.binlogs) != 0 {
 		payInfo = &payloadInfo{}
 	}
 	if err := recv(ss.p, ss.codec, ss.s, ss.dc, m, ss.maxReceiveMessageSize, payInfo, ss.decomp); err != nil {
 		if err == io.EOF {
-			if ss.binlog != nil {
-				ss.binlog.Log(&binarylog.ClientHalfClose{})
+			if len(ss.binlogs) != 0 {
+				chc := &binarylog.ClientHalfClose{}
+				for _, binlog := range ss.binlogs {
+					binlog.Log(ss.ctx, chc)
+				}
 			}
 			return err
 		}
@@ -1619,16 +1730,20 @@ func (ss *serverStream) RecvMsg(m interface{}) (err error) {
 				RecvTime: time.Now(),
 				Payload:  m,
 				// TODO truncate large payload.
-				Data:       payInfo.uncompressedBytes,
-				WireLength: payInfo.wireLength + headerLen,
-				Length:     len(payInfo.uncompressedBytes),
+				Data:             payInfo.uncompressedBytes,
+				Length:           len(payInfo.uncompressedBytes),
+				WireLength:       payInfo.compressedLength + headerLen,
+				CompressedLength: payInfo.compressedLength,
 			})
 		}
 	}
-	if ss.binlog != nil {
-		ss.binlog.Log(&binarylog.ClientMessage{
+	if len(ss.binlogs) != 0 {
+		cm := &binarylog.ClientMessage{
 			Message: payInfo.uncompressedBytes,
-		})
+		}
+		for _, binlog := range ss.binlogs {
+			binlog.Log(ss.ctx, cm)
+		}
 	}
 	return nil
 }
diff --git a/vendor/google.golang.org/grpc/tap/tap.go b/vendor/google.golang.org/grpc/tap/tap.go
index dbf34e6bb..bfa5dfa40 100644
--- a/vendor/google.golang.org/grpc/tap/tap.go
+++ b/vendor/google.golang.org/grpc/tap/tap.go
@@ -19,7 +19,7 @@
 // Package tap defines the function handles which are executed on the transport
 // layer of gRPC-Go and related information.
 //
-// Experimental
+// # Experimental
 //
 // Notice: This API is EXPERIMENTAL and may be changed or removed in a
 // later release.
diff --git a/vendor/google.golang.org/grpc/version.go b/vendor/google.golang.org/grpc/version.go
index 8934f06bc..3cc754062 100644
--- a/vendor/google.golang.org/grpc/version.go
+++ b/vendor/google.golang.org/grpc/version.go
@@ -19,4 +19,4 @@
 package grpc
 
 // Version is the current grpc version.
-const Version = "1.49.0"
+const Version = "1.56.3"
diff --git a/vendor/google.golang.org/grpc/vet.sh b/vendor/google.golang.org/grpc/vet.sh
index c3fc8253b..a8e4732b3 100644
--- a/vendor/google.golang.org/grpc/vet.sh
+++ b/vendor/google.golang.org/grpc/vet.sh
@@ -41,16 +41,8 @@ if [[ "$1" = "-install" ]]; then
     github.com/client9/misspell/cmd/misspell
   popd
   if [[ -z "${VET_SKIP_PROTO}" ]]; then
-    if [[ "${TRAVIS}" = "true" ]]; then
-      PROTOBUF_VERSION=3.14.0
-      PROTOC_FILENAME=protoc-${PROTOBUF_VERSION}-linux-x86_64.zip
-      pushd /home/travis
-      wget https://github.com/google/protobuf/releases/download/v${PROTOBUF_VERSION}/${PROTOC_FILENAME}
-      unzip ${PROTOC_FILENAME}
-      bin/protoc --version
-      popd
-    elif [[ "${GITHUB_ACTIONS}" = "true" ]]; then
-      PROTOBUF_VERSION=3.14.0
+    if [[ "${GITHUB_ACTIONS}" = "true" ]]; then
+      PROTOBUF_VERSION=22.0 # a.k.a v4.22.0 in pb.go files.
       PROTOC_FILENAME=protoc-${PROTOBUF_VERSION}-linux-x86_64.zip
       pushd /home/runner/go
       wget https://github.com/google/protobuf/releases/download/v${PROTOBUF_VERSION}/${PROTOC_FILENAME}
@@ -66,8 +58,20 @@ elif [[ "$#" -ne 0 ]]; then
   die "Unknown argument(s): $*"
 fi
 
+# - Check that generated proto files are up to date.
+if [[ -z "${VET_SKIP_PROTO}" ]]; then
+  make proto && git status --porcelain 2>&1 | fail_on_output || \
+    (git status; git --no-pager diff; exit 1)
+fi
+
+if [[ -n "${VET_ONLY_PROTO}" ]]; then
+  exit 0
+fi
+
 # - Ensure all source files contain a copyright message.
-not git grep -L "$Copyright [0-9]\{4,\} gRPC authors$\|DO NOT EDIT" -- '*.go'
+# (Done in two parts because Darwin "git grep" has broken support for compound
+# exclusion matches.)
+(grep -L "DO NOT EDIT" $(git grep -L "$Copyright [0-9]\{4,\} gRPC authors$" -- '*.go') || true) | fail_on_output
 
 # - Make sure all tests in grpc and grpc/test use leakcheck via Teardown.
 not grep 'func Test[^(]' *_test.go
@@ -81,7 +85,7 @@ not git grep -l 'x/net/context' -- "*.go"
 git grep -l '"math/rand"' -- "*.go" 2>&1 | not grep -v '^examples\|^stress\|grpcrand\|^benchmark\|wrr_test'
 
 # - Do not call grpclog directly. Use grpclog.Component instead.
-git grep -l 'grpclog.I\|grpclog.W\|grpclog.E\|grpclog.F\|grpclog.V' -- "*.go" | not grep -v '^grpclog/component.go\|^internal/grpctest/tlogger_test.go'
+git grep -l -e 'grpclog.I' --or -e 'grpclog.W' --or -e 'grpclog.E' --or -e 'grpclog.F' --or -e 'grpclog.V' -- "*.go" | not grep -v '^grpclog/component.go\|^internal/grpctest/tlogger_test.go'
 
 # - Ensure all ptypes proto packages are renamed when importing.
 not git grep "$import \|^\s*$\"github.com/golang/protobuf/ptypes/" -- "*.go"
@@ -91,13 +95,6 @@ git grep '"github.com/envoyproxy/go-control-plane/envoy' -- '*.go' ':(exclude)*.
 
 misspell -error .
 
-# - Check that generated proto files are up to date.
-if [[ -z "${VET_SKIP_PROTO}" ]]; then
-  PATH="/home/travis/bin:${PATH}" make proto && \
-    git status --porcelain 2>&1 | fail_on_output || \
-    (git status; git --no-pager diff; exit 1)
-fi
-
 # - gofmt, goimports, golint (with exceptions for generated code), go vet,
 # go mod tidy.
 # Perform these checks on each module inside gRPC.
@@ -109,7 +106,7 @@ for MOD_FILE in $(find . -name 'go.mod'); do
   goimports -l . 2>&1 | not grep -vE "\.pb\.go"
   golint ./... 2>&1 | not grep -vE "/grpc_testing_not_regenerate/.*\.pb\.go:"
 
-  go mod tidy
+  go mod tidy -compat=1.17
   git status --porcelain 2>&1 | fail_on_output || \
     (git status; git --no-pager diff; exit 1)
   popd
@@ -119,8 +116,9 @@ done
 #
 # TODO(dfawley): don't use deprecated functions in examples or first-party
 # plugins.
+# TODO(dfawley): enable ST1019 (duplicate imports) but allow for protobufs.
 SC_OUT="$(mktemp)"
-staticcheck -go 1.9 -checks 'inherit,-ST1015' ./... > "${SC_OUT}" || true
+staticcheck -go 1.19 -checks 'inherit,-ST1015,-ST1019,-SA1019' ./... > "${SC_OUT}" || true
 # Error if anything other than deprecation warnings are printed.
 not grep -v "is deprecated:.*SA1019" "${SC_OUT}"
 # Only ignore the following deprecated types/fields/functions.
diff --git a/vendor/modules.txt b/vendor/modules.txt
index 414fb1c0e..764c5a790 100644
--- a/vendor/modules.txt
+++ b/vendor/modules.txt
@@ -16,7 +16,7 @@ github.com/blang/semver
 # github.com/c9s/goprocinfo v0.0.0-20210130143923-c95fcf8c64a8
 ## explicit
 github.com/c9s/goprocinfo/linux
-# github.com/cespare/xxhash/v2 v2.1.2
+# github.com/cespare/xxhash/v2 v2.2.0
 ## explicit; go 1.11
 github.com/cespare/xxhash/v2
 # github.com/cheggaaa/pb/v3 v3.1.0
@@ -128,7 +128,7 @@ github.com/gogo/protobuf/gogoproto
 github.com/gogo/protobuf/proto
 github.com/gogo/protobuf/protoc-gen-gogo/descriptor
 github.com/gogo/protobuf/sortkeys
-# github.com/golang/glog v1.0.0 => ./staging/src/github.com/golang/glog
+# github.com/golang/glog v1.1.0 => ./staging/src/github.com/golang/glog
 ## explicit; go 1.12
 github.com/golang/glog
 # github.com/golang/groupcache v0.0.0-20210331224755-41bb18bfe9da
@@ -492,7 +492,6 @@ golang.org/x/mod/semver
 ## explicit; go 1.17
 golang.org/x/net/bpf
 golang.org/x/net/context
-golang.org/x/net/context/ctxhttp
 golang.org/x/net/html
 golang.org/x/net/html/atom
 golang.org/x/net/html/charset
@@ -508,8 +507,8 @@ golang.org/x/net/ipv4
 golang.org/x/net/ipv6
 golang.org/x/net/proxy
 golang.org/x/net/trace
-# golang.org/x/oauth2 v0.0.0-20220223155221-ee480838109b
-## explicit; go 1.11
+# golang.org/x/oauth2 v0.7.0
+## explicit; go 1.17
 golang.org/x/oauth2
 golang.org/x/oauth2/internal
 # golang.org/x/sync v0.3.0
@@ -581,10 +580,10 @@ google.golang.org/appengine/internal/log
 google.golang.org/appengine/internal/remote_api
 google.golang.org/appengine/internal/urlfetch
 google.golang.org/appengine/urlfetch
-# google.golang.org/genproto v0.0.0-20220720214146-176da50484ac
-## explicit; go 1.17
+# google.golang.org/genproto v0.0.0-20230410155749-daa745c078e1
+## explicit; go 1.19
 google.golang.org/genproto/googleapis/rpc/status
-# google.golang.org/grpc v1.49.0
+# google.golang.org/grpc v1.56.3
 ## explicit; go 1.17
 google.golang.org/grpc
 google.golang.org/grpc/attributes
-- 
2.42.0

Places

File 0001-Update-google.golang.org-grpc-to-1.56.3.patch of Package kubevirt (Revision 13bf16cacab14e3493c421e7346a4edb)

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