File 3201-ftp-Use-OTP-supervisor-as-intended.patch of Package erlang

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File 3201-ftp-Use-OTP-supervisor-as-intended.patch of Package erlang (Revision b31a222d17452b4f889310930aa1eb06)

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From ab496b62705d3b7908b4bb56bd407bf7155ea649 Mon Sep 17 00:00:00 2001
From: Ingela Anderton Andin <ingela@erlang.org>
Date: Fri, 29 Jan 2021 18:43:28 +0100
Subject: [PATCH 1/6] ftp: Use OTP supervisor as intended

Due to legacy reasons FTP clients are not part of the FTP
applications supervisor tree unless they where started
with start_service/1. This function is a legcy from a mechanism
in inets that was never intended to be part of the ftp application.
---
 lib/ftp/doc/src/ftp.xml              | 23 +++++++--------
 lib/ftp/doc/src/ftp_client.xml       |  4 +--
 lib/ftp/src/ftp.erl                  | 44 +++++++---------------------
 lib/ftp/test/ftp_SUITE.erl           | 41 ++++----------------------
 lib/stdlib/src/otp_internal.erl      |  4 +++
 system/doc/general_info/DEPRECATIONS |  3 ++
 6 files changed, 34 insertions(+), 85 deletions(-)

diff --git a/lib/ftp/doc/src/ftp.xml b/lib/ftp/doc/src/ftp.xml
index c643ba4fa0..3dc0c097ad 100644
--- a/lib/ftp/doc/src/ftp.xml
+++ b/lib/ftp/doc/src/ftp.xml
@@ -42,12 +42,10 @@
 to active FTP mode if this fails. This default behavior can be 
 changed by start option <seeerl marker="#mode">mode</seeerl>.
 
- <marker id="two_start"></marker>
-
- An FTP client can be started in two ways. One is using the 
- <seeerl marker="#service_start">service_start</seeerl> function,
- the other is to start it directly as a standalone process
- using function <seeerl marker="#open">open</seeerl>.
+ An FTP client is always started as part of the ftp application
+ and legacy 
+ <seeerl marker="#service_start">start_service</seeerl> function,
+ is deprecated in OTP-24 
 
 For a simple example of an FTP session, see 
 <seeguide marker="ftp_client">FTP User's Guide</seeguide>.
@@ -74,16 +72,16 @@
 error if the request is a listing of the contents of a directory
 that exists but is empty.
 
- <marker id="service_start"></marker>
+ <marker id="service_start"></marker>
 </description>
 
 <section>
- <title>FTP CLIENT SERVICE START/STOP</title>
+ <title>FTP CLIENT START/STOP</title>
 
 The FTP client can be started and stopped dynamically in runtime by
 calling the <c>ftp</c> application API
- <c>ftp:start_service(ServiceConfig)</c> and
- <c>ftp:stop_service(Pid)</c>.
+ <c>ftp:open(Host, Options)</c> and
+ <c>ftp:close(Client)</c>.
 
 The available configuration options are as follows:
 
@@ -538,7 +536,7 @@
 <func>
 <name since="">open(Host) -> {ok, Pid} | {error, Reason}</name>
 <name since="">open(Host, Opts) -> {ok, Pid} | {error, Reason}</name>
- <fsummary>Starts a standalone FTP client.</fsummary>
+ <fsummary>Starts a FTP client.</fsummary>
 <type>
 	<v>Host = string() | ip_address()</v>
 	<v>Opts = options()</v>
@@ -564,8 +562,7 @@
 </type>
 
 <desc>
-	Starts a standalone FTP client process 
- (without the <c>ftp</c> service framework) and
+	Starts a FTP client process and
 opens a session with the FTP server at <c>Host</c>. 
 
 	If option <c>{tls, tls_options()}</c> is present, the FTP session 
diff --git a/lib/ftp/doc/src/ftp_client.xml b/lib/ftp/doc/src/ftp_client.xml
index 047b055be7..7686548388 100644
--- a/lib/ftp/doc/src/ftp_client.xml
+++ b/lib/ftp/doc/src/ftp_client.xml
@@ -55,7 +55,7 @@
 <code type="erl"><![CDATA[
 1> ftp:start().
 ok
- 2> {ok, Pid} = ftp:start_service([{host, "erlang.org"}]).
+ 2> {ok, Pid} = ftp:open([{host, "erlang.org"}]).
 {ok,<0.22.0>}
 3> ftp:user(Pid, "guest", "password").
 ok
@@ -69,7 +69,7 @@
 ok
 8> ftp:recv(Pid, "appl.erl").
 ok
- 9> ftp:stop_service(Pid).
+ 9> ftp:close(Pid).
 ok
 10> ftp:stop().
 ok
diff --git a/lib/ftp/src/ftp.erl b/lib/ftp/src/ftp.erl
index 4ad6acaef0..c4d909a1d0 100644
--- a/lib/ftp/src/ftp.erl
+++ b/lib/ftp/src/ftp.erl
@@ -23,17 +23,15 @@
 
 -behaviour(gen_server).
 
+-deprecated([{start_service, 1, "use ftp:open/2 instead"},
+ {stop_service, 1, "use ftp:close/1 instead"}]).
+
 -export([start/0,
 start_service/1,
 stop/0,
- stop_service/1,
- services/0,
- service_info/1
+ stop_service/1
 ]).
 
-%% Added for backward compatibility
--export([start_standalone/1]).
-
 -export([start_link/1, start_link/2]).
 
 %% API - Client interface
@@ -136,20 +134,10 @@
 start() ->
 application:start(ftp).
 
-start_standalone(Options) ->
- try
- {ok, StartOptions} = start_options(Options),
- case start_link(StartOptions, []) of
- {ok, Pid} ->
- call(Pid, {open, ip_comm, Options}, plain);
- Error1 ->
- Error1
- end
- catch
- throw:Error2 ->
- Error2
- end.
-
+%% This should be made an internal function when we remove the deprecation
+%% ftp client processes should always be part of ftp supervisor tree.
+%% We consider it a bug that the "standalone" concept of inets was 
+%% not removed when ftp was broken out, and it is now fixed.
 start_service(Options) ->
 try
 {ok, StartOptions} = start_options(Options),
@@ -170,17 +158,6 @@ stop() ->
 stop_service(Pid) ->
 close(Pid).
 
-services() ->
- [{ftpc, Pid} || {_, Pid, _, _} <-
- supervisor:which_children(ftp_sup)].
-service_info(Pid) ->
- {ok, Info} = call(Pid, info, list),
- {ok, [proplists:lookup(mode, Info),
- proplists:lookup(local_port, Info),
- proplists:lookup(peer, Info),
- proplists:lookup(peer_port, Info)]}.
-
-
 %%%=========================================================================
 %%% API - CLIENT FUNCTIONS
 %%%=========================================================================
@@ -215,7 +192,7 @@ open(Host, Port) when is_integer(Port) ->
 %% </BACKWARD-COMPATIBILLITY>
 
 open(Host, Options) when is_list(Options) ->
- start_standalone([{host,Host}|Options]).
+ start_service([{host,Host}|Options]).
 
 %%--------------------------------------------------------------------------
 %% user(Pid, User, Pass, <Acc>) -> ok | {error, euser} | {error, econn}
@@ -1520,8 +1497,7 @@ code_change(_Vsn, State, _Extra) ->
 %% start_link([Opts, GenServerOptions]) -> {ok, Pid} | {error, Reason}
 %%
 %% Description: Callback function for the ftp supervisor. It is called
-%% : when start_service/1 calls ftp_sup:start_child/1 to start an
-%% : instance of the ftp process. Also called by start_standalone/1
+%% : when open or legacy is called. 
 %%--------------------------------------------------------------------------
 start_link([Opts, GenServerOptions]) ->
 start_link(Opts, GenServerOptions).
diff --git a/lib/ftp/test/ftp_SUITE.erl b/lib/ftp/test/ftp_SUITE.erl
index d5c827f0f2..b2cdd882c6 100644
--- a/lib/ftp/test/ftp_SUITE.erl
+++ b/lib/ftp/test/ftp_SUITE.erl
@@ -128,7 +128,6 @@ ftp_tests_smoke() ->
 
 ftp_sup_tests() ->
 [
- start_ftp,
 ftp_worker
 ].
 
@@ -292,22 +291,10 @@ init_per_group(Group, Config) when Group == ftpes_passive;
 _:_ ->
 {skip, "Crypto did not start"}
 end;
-init_per_group(ftp_sup, Config) ->
- try ftp:start() of
- ok ->
- start_ftpd(Config)
- catch
- _:_ ->
- {skip, "Ftp did not start"}
- end;
+
 init_per_group(_Group, Config) ->
 start_ftpd(Config).
 
-
-end_per_group(ftp_sup, Config) ->
- ftp:stop(),
- stop_ftpd(Config),
- Config;
 end_per_group(_Group, Config) ->
 stop_ftpd(Config),
 Config.
@@ -316,6 +303,7 @@ end_per_group(_Group, Config) ->
 init_per_testcase(T, Config0) when T =:= app; T =:= appup ->
 Config0;
 init_per_testcase(Case, Config0) ->
+ application:ensure_started(ftp),
 case Case of
 error_datafail ->
 catch crypto:stop(),
@@ -362,7 +350,7 @@ init_per_testcase2(Case, Config0) ->
 ftpes_active_reuse -> ftp__open(Config0, TLSReuse ++ ACTIVE ++ ExtraOpts);
 ftps_passive_reuse -> ftp__open(Config0, SSLReuse ++ PASSIVE ++ ExtraOpts);
 ftps_active_reuse -> ftp__open(Config0, SSLReuse ++ ACTIVE ++ ExtraOpts);
- ftp_sup -> ftp_start_service(Config0, ACTIVE ++ ExtraOpts);
+ ftp_sup -> ftp__open(Config0, ACTIVE ++ ExtraOpts);
 undefined -> Config0
 end,
 case Case of
@@ -1025,26 +1013,6 @@ clean_shutdown(Config) ->
 end
 end.
 
-%%-------------------------------------------------------------------------
-start_ftp() ->
- [{doc, "Start/stop of ftp service"}].
-start_ftp(Config) ->
- Pid0 = proplists:get_value(ftp,Config),
- Pids0 = [ServicePid || {_, ServicePid} <- ftp:services()],
- true = lists:member(Pid0, Pids0),
- {ok, [_|_]} = ftp:service_info(Pid0),
- ftp:stop_service(Pid0),
- ct:sleep(100),
- Pids1 = [ServicePid || {_, ServicePid} <- ftp:services()],
- false = lists:member(Pid0, Pids1),
-
- Host = proplists:get_value(ftpd_host,Config),
- Port = proplists:get_value(ftpd_port,Config),
-
- {ok, Pid1} = ftp:start_standalone([{host, Host},{port, Port}]),
- Pids2 = [ServicePid || {_, ServicePid} <- ftp:services()],
- false = lists:member(Pid1, Pids2).
-
 %%-------------------------------------------------------------------------
 ftp_worker() ->
 [{doc, "Makes sure the ftp worker processes are added and removed "
@@ -1053,7 +1021,7 @@ ftp_worker(Config) ->
 Pid = proplists:get_value(ftp,Config),
 case supervisor:which_children(ftp_sup) of
 [{_,_, worker, [ftp]}] ->
- ftp:stop_service(Pid),
+ ftp:close(Pid),
 ct:sleep(5000),
 [] = supervisor:which_children(ftp_sup),
 ok;
@@ -1264,6 +1232,7 @@ ftpd_running(Config) ->
 undefined =/= ChkUp(proplists:get_value(ftpd_start_result,Config)).
 
 ftp__open(Config, Options) ->
+ application:ensure_started(ftp),
 Host = proplists:get_value(ftpd_host,Config),
 Port = proplists:get_value(ftpd_port,Config),
 ct:log("Host=~p, Port=~p",[Host,Port]),
diff --git a/lib/stdlib/src/otp_internal.erl b/lib/stdlib/src/otp_internal.erl
index 6f691f2c3c..55fbbc4a6e 100644
--- a/lib/stdlib/src/otp_internal.erl
+++ b/lib/stdlib/src/otp_internal.erl
@@ -23,6 +23,10 @@
 -include("otp_internal.hrl").
 %%
 -dialyzer({no_match, obsolete/3}).
+obsolete(ftp, start_service, 1) ->
+ {deprecated, "use ftp:open/2 instead"};
+obsolete(ftp, stop_service, 1) ->
+ {deprecated, "use ftp:close/1 instead"};
 obsolete(auth, cookie, 0) ->
 {deprecated, "use erlang:get_cookie/0 instead"};
 obsolete(auth, cookie, 1) ->
diff --git a/system/doc/general_info/DEPRECATIONS b/system/doc/general_info/DEPRECATIONS
index 0b18d6216f..54994ce80f 100644
--- a/system/doc/general_info/DEPRECATIONS
+++ b/system/doc/general_info/DEPRECATIONS
@@ -17,6 +17,12 @@
 # is scheduled to be removed in OTP 25.
 #
 
+#
+# Added in OTP 24.
+#
+
+ftp:start_service/1 since=24 remove=26
+ftp:start_service/1 since=24 remove=26
 disk_log:accessible_logs/0 since=24 remove=26
 disk_log:lclose/1 since=24 remove=26
 disk_log:lclose/2 since=24 remove=26
-- 
2.26.2

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