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0192-kernel-Cleanup-logger-docs-a-bit.patch
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File 0192-kernel-Cleanup-logger-docs-a-bit.patch of Package erlang
From 56b39597c44e1f3dc579adde7ed4ce75759aa43c Mon Sep 17 00:00:00 2001 From: Lukas Larsson <lukas@erlang.org> Date: Wed, 29 May 2024 21:40:13 +0200 Subject: [PATCH 2/6] kernel: Cleanup logger docs a bit --- lib/kernel/doc/guides/logger_chapter.md | 88 ++++++++++-------------- lib/kernel/doc/guides/logger_cookbook.md | 4 +- lib/kernel/doc/kernel_app.md | 4 +- lib/kernel/src/logger.erl | 20 +++--- lib/kernel/src/logger_disk_log_h.erl | 10 +-- lib/kernel/src/logger_formatter.erl | 4 +- lib/kernel/src/logger_std_h.erl | 8 +-- 7 files changed, 60 insertions(+), 78 deletions(-) diff --git a/lib/kernel/doc/guides/logger_chapter.md b/lib/kernel/doc/guides/logger_chapter.md index 2fb6ec2e06..1d809b5766 100644 --- a/lib/kernel/doc/guides/logger_chapter.md +++ b/lib/kernel/doc/guides/logger_chapter.md @@ -80,7 +80,7 @@ Log levels are expressed as atoms. Internally in Logger, the atoms are mapped to integer values, and a log event passes the log level check if the integer value of its log level is less than or equal to the currently configured log level. That is, the check passes if the event is equally or more severe than the -configured level. See section [Log Level](logger_chapter.md#log_level) for a +configured level. See section [Log Level](#log-level) for a listing and description of all log levels. The primary log level can be overridden by a log level configured per module. @@ -90,12 +90,12 @@ system. Filter functions can be used for more sophisticated filtering than the log level check provides. A filter function can stop or pass a log event, based on any of the event's contents. It can also modify all parts of the log event. See section -[Filters](logger_chapter.md#filters) for more details. +[Filters](#filters) for more details. If a log event passes through all primary filters and all handler filters for a specific handler, Logger forwards the event to the _handler callback_. The handler formats and prints the event to its destination. See section -[Handlers](logger_chapter.md#handlers) for more details. +[Handlers](#handlers) for more details. Everything up to and including the call to the handler callbacks is executed on the client process, that is, the process where the log event was issued. It is @@ -103,8 +103,6 @@ up to the handler implementation if other processes are involved or not. The handlers are called in sequence, and the order is not defined. -[](){: #logger_api } - ## Logger API The API for logging consists of a set of [macros](`m:logger#module-macros`), and a set @@ -123,8 +121,6 @@ macros add location (originator) information to the metadata, and performs lazy evaluation by wrapping the logger call in a case statement, so it is only evaluated if the log level of the event passes the primary log level check. -[](){: #log_level } - ### Log Level The log level indicates the severity of a event. In accordance with the Syslog @@ -149,8 +145,6 @@ Notice that the integer value is only used internally in Logger. In the API, you must always use the atom. To compare the severity of two log levels, use `logger:compare_levels/2`. -[](){: #log_message } - ### Log Message The log message contains the information to be logged. The message can consist @@ -159,13 +153,13 @@ API), a string or a report. Example, format string and arguments: -```text +```erlang logger:error("The file does not exist: ~ts",[Filename]) ``` Example, string: -```text +```erlang logger:notice("Something strange happened!") ``` @@ -175,13 +169,13 @@ the log event as it needs to. Example, report: -```text +```erlang ?LOG_ERROR(#{ user => joe, filename => Filename, reason => enoent }) ``` Reports can be accompanied by a _report callback_ specified in the log event's -[metadata](logger_chapter.md#metadata). The report callback is a convenience -function that the [formatter](logger_chapter.md#formatters) can use to convert +[metadata](#metadata). The report callback is a convenience +function that the [formatter](#formatters) can use to convert the report to a format string and arguments, or directly to a string. The formatter can also use its own conversion function, if no callback is provided, or if a customized formatting is desired. @@ -249,8 +243,6 @@ See the description of the `t:logger:metadata/0` type for information about which default keys Logger inserts, and how the different metadata maps are merged. -[](){: #filter } - ## Filters Filters can be primary, or attached to a specific handler. Logger calls the @@ -294,12 +286,12 @@ Logger forwards the event to the handler callback. If `filter_default` is set to Primary filters are added with `logger:add_primary_filter/2` and removed with `logger:remove_primary_filter/1`. They can also be added at system start via the -Kernel configuration parameter [`logger`](logger_chapter.md#logger_parameter). +Kernel configuration parameter [`logger`](#logger_parameter). Handler filters are added with `logger:add_handler_filter/3` and removed with `logger:remove_handler_filter/2`. They can also be specified directly in the configuration when adding a handler with `logger:add_handler/3` or via the -Kernel configuration parameter [`logger`](logger_chapter.md#logger_parameter). +Kernel configuration parameter [`logger`](#logger_parameter). To see which filters are currently installed in the system, use `logger:get_config/0`, or `logger:get_primary_config/0` and @@ -399,9 +391,9 @@ information about this module. At system start, Logger is configured through Kernel configuration parameters. The parameters that apply to Logger are described in section -[Kernel Configuration Parameters](logger_chapter.md#kernel_config_params). +[Kernel Configuration Parameters](#kernel-configuration-parameters). Examples are found in section -[Configuration Examples](logger_chapter.md#config_examples). +[Configuration Examples](#configuration-examples). During runtime, Logger configuration is changed via API functions. See section [Configuration API Functions](`m:logger#configuration-api-functions`) in the `m:logger` @@ -419,16 +411,16 @@ Logger API functions that apply to the primary Logger configuration are: The primary Logger configuration is a map with the following keys: -- **`level = `{: #primary_level }`t:logger:level/0`` | all | none`** - Specifies +- **`level = `{: #primary_level }`t:logger:level/0` ` | all | none`** - Specifies the primary log level, that is, log event that are equally or more severe than this level, are forwarded to the primary filters. Less severe log events are immediately discarded. - See section [Log Level](logger_chapter.md#log_level) for a listing and + See section [Log Level](#log-level) for a listing and description of possible log levels. The initial value of this option is set by the Kernel configuration parameter - [`logger_level`](logger_chapter.md#logger_level). It is changed during runtime + [`logger_level`](#logger_level). It is changed during runtime with [`logger:set_primary_config(level,Level)`](`logger:set_primary_config/2`). @@ -440,11 +432,11 @@ The primary Logger configuration is a map with the following keys: - `Filter = ``t:logger:filter/0` The initial value of this option is set by the Kernel configuration parameter - [`logger`](logger_chapter.md#logger_parameter). During runtime, primary + [`logger`](#logger_parameter). During runtime, primary filters are added and removed with `logger:add_primary_filter/2` and `logger:remove_primary_filter/1`, respectively. - See section [Filters](logger_chapter.md#filters) for more detailed + See section [Filters](#filters) for more detailed information. Defaults to `[]`. @@ -452,7 +444,7 @@ The primary Logger configuration is a map with the following keys: - **`filter_default = log | stop`** - Specifies what happens to a log event if all filters return `ignore`, or if no filters exist. - See section [Filters](logger_chapter.md#filters) for more information about + See section [Filters](#filters) for more information about how this option is used. Defaults to `log`. @@ -460,13 +452,11 @@ The primary Logger configuration is a map with the following keys: - **`metadata = `[`metadata()`](`t:logger:metadata/0`)** - The primary metadata to be used for all log calls. - See section [Metadata](logger_chapter.md#metadata) for more information about + See section [Metadata](#metadata) for more information about how this option is used. Defaults to `#{}`. -[](){: #handler_configuration } - ### Handler Configuration Logger API functions that apply to handler configuration are: @@ -492,7 +482,7 @@ The configuration for a handler is a map with the following keys: the handler, that is, log events that are equally or more severe than this level, are forwarded to the handler filters for this handler. - See section [Log Level](logger_chapter.md#log_level) for a listing and + See section [Log Level](#log-level) for a listing and description of possible log levels. The log level is specified when adding the handler, or changed during runtime @@ -510,14 +500,14 @@ The configuration for a handler is a map with the following keys: during runtime with `logger:add_handler_filter/3` and `logger:remove_handler_filter/2`, respectively. - See [Filters](logger_chapter.md#filters) for more detailed information. + See [Filters](#filters) for more detailed information. Defaults to `[]`. - **`filter_default = log | stop`** - Specifies what happens to a log event if all filters return `ignore`, or if no filters exist. - See section [Filters](logger_chapter.md#filters) for more information about + See section [Filters](#filters) for more information about how this option is used. Defaults to `log`. @@ -535,7 +525,7 @@ The configuration for a handler is a map with the following keys: the complete formatter information can be overwritten with, for instance, `logger:set_handler_config/3`. - See section [Formatters](logger_chapter.md#formatters) for more detailed + See section [Formatters](#formatters) for more detailed information. Defaults to `{logger_formatter,DefaultFormatterConfig}`. See the @@ -553,21 +543,19 @@ Notice that `level` and `filters` are obeyed by Logger itself before forwarding the log events to each handler, while `formatter` and all handler specific options are left to the handler implementation. -[](){: #kernel_config_params } - ### Kernel Configuration Parameters The following Kernel configuration parameters apply to Logger: - **`logger = [Config]`{: #logger_parameter }** - Specifies the configuration for [Logger](`m:logger`), except the primary log level, which is specified - with [`logger_level`](logger_chapter.md#logger_level), and the compatibility + with [`logger_level`](#logger_level), and the compatibility with [SASL Error Logging](`e:sasl:error_logging.md`), which is specified with - [`logger_sasl_compatible`](logger_chapter.md#logger_sasl_compatible). + [`logger_sasl_compatible`](#logger_sasl_compatible). With this parameter, you can modify or disable the default handler, add custom handlers and primary logger filters, set log levels per module, and modify the - [proxy](logger_chapter.md#proxy) configuration. + [proxy](#logger-proxy) configuration. `Config` is any (zero or more) of the following: @@ -618,7 +606,7 @@ The following Kernel configuration parameters apply to Logger: for each `Filter`. `FilterDefault` specifies the behaviour if all primary filters return - `ignore`, see section [Filters](logger_chapter.md#filters). + `ignore`, see section [Filters](#filters). Only one entry of this type is allowed. @@ -643,7 +631,7 @@ The following Kernel configuration parameters apply to Logger: Only one entry of this type is allowed. - See section [Configuration Examples](logger_chapter.md#config_examples) for + See section [Configuration Examples](#configuration-examples) for examples using the `logger` parameter for system configuration. - **`logger_metadata = map()`{: #logger_metadata }** - Specifies the primary @@ -660,8 +648,6 @@ The following Kernel configuration parameters apply to Logger: [`kernel(6)`](kernel_app.md#logger_sasl_compatible) manual page for more information about this parameter. -[](){: #config_examples } - ### Configuration Examples The value of the Kernel configuration parameter `logger` is a list of tuples. It @@ -722,8 +708,6 @@ Modify the default handler to only print errors and more severe log events to ]}]}]. ``` -[](){: #compatibility } - ## Backwards Compatibility with error_logger Logger provides backwards compatibility with `error_logger` in the following @@ -741,7 +725,7 @@ ways: contains the actual log message, and `Metadata` contains additional information which can be used for creating backwards compatible events for legacy `error_logger` event handlers, see section - [Legacy Event Handlers](logger_chapter.md#legacy_event_handlers). + [Legacy Event Handlers](#legacy_event_handlers). - **Output Format** - To get log events on the same format as produced by `error_logger_tty_h` and `error_logger_file_h`, use the default formatter, @@ -777,7 +761,7 @@ ways: - Progress reports are issued as `info` level log events, and since the default primary log level is `notice`, these are not logged by default. To enable printing of progress reports, set the - [primary log level](logger_chapter.md#primary_level) to `info`. + [primary log level](#primary_level) to `info`. - The output format is the same for all log events. If the old behaviour is preferred, the Kernel configuration parameter @@ -831,7 +815,7 @@ in question from the configuration, and print a short error message to the terminal. A debug event containing the crash reason and other details is also issued. -See section [Log Message](logger_chapter.md#log_message) for more information +See section [Log Message](#log-message) for more information about report callbacks and valid forms of log messages. ## Example: Add a handler to log info events to file @@ -885,7 +869,7 @@ all non-info events. The built-in filter `logger_filters:level/2` can do this: ok ``` -See section [Filters](logger_chapter.md#filters) for more information about the +See section [Filters](#filters) for more information about the filters and the `filter_default` configuration parameter. ## Example: Implement a handler @@ -942,7 +926,7 @@ Notice that the above handler does not have any overload protection, and all log events are printed directly from the client process. For information and examples of overload protection, please refer to section -[Protecting the Handler from Overload](logger_chapter.md#overload_protection), +[Protecting the Handler from Overload](#overload_protection), and the implementation of `m:logger_std_h` and [`logger_disk_log_h` ](`m:logger_disk_log_h`). @@ -1007,7 +991,7 @@ actions, exist: - **`sync_mode_qlen`** - As long as the length of the message queue is lower than this value, all log events are handled asynchronously. This means that the client process sending the log event, by calling a log function in the - [Logger API](logger_chapter.md#logger_api), does not wait for a response from + [Logger API](#logger-api), does not wait for a response from the handler but continues executing immediately after the event is sent. It is not affected by the time it takes the handler to print the event to the log device. If the message queue grows larger than this value, the handler starts @@ -1169,8 +1153,6 @@ place, and the handler is back in action. > information about how to limit the size of log events, see the > `m:logger_formatter` manual page. -[](){: #proxy } - ## Logger Proxy The Logger proxy is an Erlang process which is part of the Kernel application's @@ -1188,7 +1170,7 @@ When receiving a log event, either from the emulator or from a remote node, the proxy calls the Logger API to log the event. The proxy process is overload protected in the same way as described in section -[Protecting the Handler from Overload](logger_chapter.md#overload_protection), +[Protecting the Handler from Overload](#overload_protection), but with the following default values: ```erlang diff --git a/lib/kernel/doc/guides/logger_cookbook.md b/lib/kernel/doc/guides/logger_cookbook.md index de90fca9ff..4cf5bc3e61 100644 --- a/lib/kernel/doc/guides/logger_cookbook.md +++ b/lib/kernel/doc/guides/logger_cookbook.md @@ -312,7 +312,7 @@ or the below if you use a single line formatter: #### See also -- [Log Message](logger_chapter.md#log_message) in the Logging User's Guide +- [Log Message](logger_chapter.md#log-message) in the Logging User's Guide ### Report call-backs and printing of events @@ -348,7 +348,7 @@ where the second argument is the formatting options. #### See also -- [Log Message](logger_chapter.md#log_message) in the Logging User's Guide +- [Log Message](logger_chapter.md#log-message) in the Logging User's Guide - [Logger Report Callbacks](`t:logger:report_cb/0`) ## Filters diff --git a/lib/kernel/doc/kernel_app.md b/lib/kernel/doc/kernel_app.md index 8d303c6064..432d678823 100644 --- a/lib/kernel/doc/kernel_app.md +++ b/lib/kernel/doc/kernel_app.md @@ -184,7 +184,7 @@ For more information about configuration parameters, see file See section [SASL Error Logging](`e:sasl:error_logging.md`) in the SASL User's Guide, and section - [Backwards Compatibility with error_logger](logger_chapter.md#compatibility) + [Backwards Compatibility with error_logger](logger_chapter.md#backwards-compatibility-with-error_logger) in the Kernel User's Guide for information about the SASL error logging functionality, and how Logger can be backwards compatible with this. @@ -519,5 +519,5 @@ set. erl -kernel logger '[{handler,default,logger_std_h,#{formatter=>{logger_formatter,#{legacy_header=>true,template=>[{logger_formatter,header},"\n",msg,"\n"],depth=>10}}}]' ``` -See [Backwards compatibility with error_logger](logger_chapter.md#compatibility) +See [Backwards compatibility with error_logger](logger_chapter.md#backwards-compatibility-with-error_logger) for more information. diff --git a/lib/kernel/src/logger.erl b/lib/kernel/src/logger.erl index f34c755c9a..5d1ba10d95 100644 --- a/lib/kernel/src/logger.erl +++ b/lib/kernel/src/logger.erl @@ -175,7 +175,7 @@ equal to or below the configured log level. A fun which converts a [`report()`](`t:report/0`) to a format string and arguments, or directly to a string. -See section [Log Message](logger_chapter.md#log_message) in the User's Guide +See section [Log Message](logger_chapter.md#log-message) in the User's Guide for more information. """. -type report_cb() :: fun((report()) -> {io:format(),[term()]}) | @@ -235,7 +235,7 @@ The following custom metadata keys have special meaning: `report_cb` key can be associated with a fun (report callback) that converts the report to a format string and arguments, or directly to a string. See the type definition of `t:report_cb/0`, and section - [Log Message](logger_chapter.md#log_message) in the User's Guide for more + [Log Message](logger_chapter.md#log-message) in the User's Guide for more information about report callbacks. """. -type metadata() :: #{pid => pid(), @@ -529,8 +529,8 @@ log(Level, StringOrReport) -> do_log(Level,StringOrReport,#{}). -doc """ -Create a log event at the given [log level](logger_chapter.md#log_level), with -the given [message](logger_chapter.md#log_message) to be logged and +Create a log event at the given [log level](logger_chapter.md#log-level), with +the given [message](logger_chapter.md#log-message) to be logged and [_metadata_](logger_chapter.md#metadata). *Example*: @@ -561,8 +561,8 @@ log(Level, FunOrFormat, Args) -> do_log(Level,{FunOrFormat,Args},#{}). -doc """ -Create a log event at the given [log level](logger_chapter.md#log_level), with -the given [message](logger_chapter.md#log_message) to be logged and +Create a log event at the given [log level](logger_chapter.md#log-level), with +the given [message](logger_chapter.md#log-message) to be logged and [_metadata_](logger_chapter.md#metadata). The message and metadata can either be given directly in the arguments, or @@ -656,7 +656,7 @@ format_otp_report(Report) -> -doc """ Convert a log message on report form to `{Format, Args}`. This is the default report callback used by `m:logger_formatter` when no custom report callback is -found. See section [Log Message](logger_chapter.md#log_message) in the Kernel +found. See section [Log Message](logger_chapter.md#log-message) in the Kernel User's Guide for information about report callbacks and valid forms of log messages. @@ -949,7 +949,7 @@ complex merge is needed, read the current configuration with the new configuration back with this function. For more information about the proxy, see section -[Logger Proxy](logger_chapter.md#proxy) in the Kernel User's Guide. +[Logger Proxy](logger_chapter.md#logger-proxy) in the Kernel User's Guide. """. -doc(#{title => <<"Configuration API functions">>,since => <<"OTP 21.3">>}). -spec set_proxy_config(Config) -> ok | {error,term()} when @@ -1045,7 +1045,7 @@ To overwrite the existing configuration without any merge, use [`set_proxy_config/1` ](`set_proxy_config/1`). For more information about the proxy, see section -[Logger Proxy](logger_chapter.md#proxy) in the Kernel User's Guide. +[Logger Proxy](logger_chapter.md#logger-proxy) in the Kernel User's Guide. """. -doc(#{title => <<"Configuration API functions">>,since => <<"OTP 21.3">>}). -spec update_proxy_config(Config) -> ok | {error,term()} when @@ -1098,7 +1098,7 @@ get_handler_ids() -> Look up the current configuration for the Logger proxy. For more information about the proxy, see section -[Logger Proxy](logger_chapter.md#proxy) in the Kernel User's Guide. +[Logger Proxy](logger_chapter.md#logger-proxy) in the Kernel User's Guide. """. -doc(#{title => <<"Configuration API functions">>,since => <<"OTP 21.3">>}). -spec get_proxy_config() -> Config when diff --git a/lib/kernel/src/logger_disk_log_h.erl b/lib/kernel/src/logger_disk_log_h.erl index 21c6033346..ea513fd16c 100644 --- a/lib/kernel/src/logger_disk_log_h.erl +++ b/lib/kernel/src/logger_disk_log_h.erl @@ -32,12 +32,12 @@ handler at startup of the Kernel application. See an example of this below. The handler has an overload protection mechanism that keeps the handler process and the Kernel application alive during high loads of log events. How overload protection works, and how to configure it, is described in the -[`User's Guide` ](logger_chapter.md#overload_protection). +[`User's Guide`](logger_chapter.md#overload_protection). To add a new instance of the disk_log handler, use -[`logger:add_handler/3` ](`logger:add_handler/3`). The handler configuration +[`logger:add_handler/3`](`logger:add_handler/3`). The handler configuration argument is a map which can contain general configuration parameters, as -documented in the [`User's Guide` ](logger_chapter.md#handler_configuration), +documented in the [`User's Guide`](logger_chapter.md#handler-configuration), and handler specific parameters. The specific data is stored in a sub map with the key `config`, and can contain the following parameters: @@ -89,13 +89,13 @@ the key `config`, and can contain the following parameters: Defaults to `5000` milliseconds. If `no_repeat` is set as value, the repeated sync operation is disabled. The - user can also call the [`filesync/1` ](`filesync/1`)function to perform a + user can also call the [`filesync/1`](`filesync/1`) function to perform a disk_log sync. Other configuration parameters exist, to be used for customizing the overload protection behaviour. The same parameters are used both in the standard handler and the disk_log handler, and are documented in the -[`User's Guide` ](logger_chapter.md#overload_protection). +[`User's Guide`](logger_chapter.md#overload_protection). Notice that when changing the configuration of the handler in runtime, the disk_log options (`file`, `type`, `max_no_files`, `max_no_bytes`) must not be diff --git a/lib/kernel/src/logger_formatter.erl b/lib/kernel/src/logger_formatter.erl index 5fd8da296f..65e56f18eb 100644 --- a/lib/kernel/src/logger_formatter.erl +++ b/lib/kernel/src/logger_formatter.erl @@ -23,7 +23,7 @@ Default formatter for Logger. Each Logger handler has a configured formatter specified as a module and a configuration term. The purpose of the formatter is to translate the log events -to a final printable string ([`unicode:chardata()` ](`t:unicode:chardata/0`)) +to a final printable string ([`unicode:chardata()`](`t:unicode:chardata/0`)) which can be written to the output device of the handler. See sections [Handlers](logger_chapter.md#handlers) and [Formatters](logger_chapter.md#formatters) in the Kernel User's Guide for more @@ -279,7 +279,7 @@ The log event is processed as follows: - If the message is on report form, it is converted to `{Format,Args}` by calling the report callback. See section - [Log Message](logger_chapter.md#log_message) in the Kernel User's Guide for + [Log Message](logger_chapter.md#log-message) in the Kernel User's Guide for more information about report callbacks and valid forms of log messages. - The message size is limited according to the values of configuration parameters [`chars_limit`](`m:logger_formatter#chars_limit`) and diff --git a/lib/kernel/src/logger_std_h.erl b/lib/kernel/src/logger_std_h.erl index 441c64ed59..5c03d88e99 100644 --- a/lib/kernel/src/logger_std_h.erl +++ b/lib/kernel/src/logger_std_h.erl @@ -29,12 +29,12 @@ be added to Logger, and each instance prints logs to The handler has an overload protection mechanism that keeps the handler process and the Kernel application alive during high loads of log events. How overload protection works, and how to configure it, is described in the -[`User's Guide` ](logger_chapter.md#overload_protection). +[`User's Guide`](logger_chapter.md#overload_protection). To add a new instance of the standard handler, use -[`logger:add_handler/3` ](`logger:add_handler/3`). The handler configuration +[`logger:add_handler/3`](`logger:add_handler/3`). The handler configuration argument is a map which can contain general configuration parameters, as -documented in the [`User's Guide` ](logger_chapter.md#handler_configuration), +documented in the [`User's Guide`](logger_chapter.md#handler-configuration), and handler specific parameters. The specific data is stored in a sub map with the key `config`, and can contain the following parameters: @@ -139,7 +139,7 @@ the key `config`, and can contain the following parameters: Other configuration parameters exist, to be used for customizing the overload protection behaviour. The same parameters are used both in the standard handler and the disk_log handler, and are documented in the -[`User's Guide` ](logger_chapter.md#overload_protection). +[`User's Guide`](logger_chapter.md#overload_protection). Notice that if changing the configuration of the handler in runtime, the `type`, `file`, or `modes` parameters must not be modified. -- 2.35.3
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