File 6865-kernel-Add-logger_handler-callbacks.patch of Package erlang

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File 6865-kernel-Add-logger_handler-callbacks.patch of Package erlang (Revision 7ca8474baff281f894ff6ebde8ccfe01)

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From 2afd6748f16ad226d0ae12b54e57e0147dafdbdd Mon Sep 17 00:00:00 2001
From: Lukas Larsson <lukas@erlang.org>
Date: Wed, 4 Oct 2023 13:59:22 +0200
Subject: [PATCH 05/10] kernel: Add logger_handler callbacks

We move the handler callbacks to a separate module so
that the documentation can live there and so that we
can use -behavior(logger_handler) which makes more sense
than -behaviour(logger).
---
 lib/kernel/doc/src/Makefile               |   1 +
 lib/kernel/doc/src/logger.xml             | 185 ++----------------
 lib/kernel/doc/src/logger_chapter.xml     |  16 +-
 lib/kernel/doc/src/logger_handler.xml     | 224 ++++++++++++++++++++++
 lib/kernel/doc/src/ref_man.xml            |   1 +
 lib/kernel/doc/src/specs.xml              |   1 +
 lib/kernel/src/Makefile                   |   8 +-
 lib/kernel/src/error_logger.erl           |   8 +-
 lib/kernel/src/kernel.app.src             |   1 +
 lib/kernel/src/logger.erl                 |  93 ++++-----
 lib/kernel/src/logger_disk_log_h.erl      |   4 +-
 lib/kernel/src/logger_h_common.erl        |   4 +-
 lib/kernel/src/logger_handler.erl         |  61 ++++++
 lib/kernel/src/logger_handler_watcher.erl |   2 +-
 lib/kernel/src/logger_simple_h.erl        |   2 +
 lib/kernel/src/logger_std_h.erl           |  16 +-
 16 files changed, 369 insertions(+), 258 deletions(-)
 create mode 100644 lib/kernel/doc/src/logger_handler.xml
 create mode 100644 lib/kernel/src/logger_handler.erl

diff --git a/lib/kernel/doc/src/Makefile b/lib/kernel/doc/src/Makefile
index a9fd26904a..143a841f3b 100644
--- a/lib/kernel/doc/src/Makefile
+++ b/lib/kernel/doc/src/Makefile
@@ -59,6 +59,7 @@ XML_REF3_FILES = application.xml \
 logger_disk_log_h.xml \
 logger_filters.xml \
 logger_formatter.xml \
+ logger_handler.xml \
 	net.xml \
 	net_adm.xml \
 	net_kernel.xml \
diff --git a/lib/kernel/doc/src/logger.xml b/lib/kernel/doc/src/logger.xml
index 0c2a963e6e..ceafb8e0df 100644
--- a/lib/kernel/doc/src/logger.xml
+++ b/lib/kernel/doc/src/logger.xml
@@ -134,40 +134,21 @@ logger:error("error happened because: ~p", [Reason]). % Without macro
 <datatype>
 <name name="handler_config"/>
 <desc>
-	Handler configuration data for Logger. The following
-	 default values apply:
-	<list>
-	 <item><c>level => all</c></item>
-	 <item><c>filter_default => log</c></item>
-	 <item><c>filters => []</c></item>
-	 <item><c>formatter => {logger_formatter, DefaultFormatterConfig</c>}</item>
-	</list>
-	In addition to these, the following fields are
-	 automatically inserted by Logger, values taken from the
-	 two first parameters
-	 to <seemfa marker="#add_handler/3"><c>add_handler/3</c></seemfa>:
-	<list>
-	 <item><c>id => HandlerId</c></item>
-	 <item><c>module => Module</c></item>
-	</list>
-	These are read-only and cannot be changed in runtime.
-	Handler specific configuration data is inserted by the
-	 handler callback itself, in a sub structure associated with
-	 the field named <c>config</c>. See
-	 the <seeerl marker="logger_std_h"><c>logger_std_h(3)</c></seeerl>
-	 and <seeerl marker="logger_disk_log_h"><c>logger_disk_log_h(3)</c></seeerl>
-	 manual pages for information about the specific configuration
-	 for these handlers.
-	See the <seetype marker="logger_formatter#config">
-	 <c>logger_formatter(3)</c></seetype> manual page for
-	 information about the default configuration for this
-	 formatter.
+	 Handler configuration data for Logger.
+ <note>
+ DEPRECATED: Use <seetype marker="logger_handler#config"><c>logger_handler:config()</c></seetype> instead.
+ 
+ </note>
 </desc>
 </datatype>
 <datatype>
 <name name="handler_id"/>
 <desc>
-	A unique identifier for a handler instance.
+	 A unique identifier for a handler instance.
+ <note>
+ DEPRECATED: Use <seetype marker="logger_handler#id"><c>logger_handler:id()</c></seetype> instead.
+ 
+ </note>
 </desc>
 </datatype>
 <datatype>
@@ -837,8 +818,8 @@ start(_, []) ->
 	 the rest, use <seemfa marker="#update_handler_config/3">
 	 <c>update_handler_config/3</c></seemfa>.
 	See the definition of
-	 the <seetype marker="#handler_config">
-	 <c>handler_config()</c></seetype> type for more
+	 the <seetype marker="logger_handler#config">
+	 <c>logger_handler:config()</c></seetype> type for more
 	 information about the different parameters.
 </desc>
 </func>
@@ -1073,8 +1054,8 @@ logger:set_handler_config(HandlerId, maps:merge(Old, Config)).
 	 use <seemfa marker="#set_handler_config/3">
 	 <c>set_handler_config/3</c></seemfa>.
 	See the definition of
-	 the <seetype marker="#handler_config">
-	 <c>handler_config()</c></seetype> type for more
+	 the <seetype marker="logger_handler#config">
+	 <c>logger_handler:config()</c></seetype> type for more
 	 information about the different parameters.
 </desc>
 </func>
@@ -1134,7 +1115,6 @@ logger:set_proxy_config(maps:merge(Old, Config)).
 </func>
 </funcs>
 
- 
 <funcs>
 <fsdescription>
 <marker id="misc_API"/>
@@ -1203,142 +1183,6 @@ logger:set_proxy_config(maps:merge(Old, Config)).
 
 </funcs>
 
- 
-
- <funcs>
- <fsdescription>
- <marker id="handler_callback_functions"/>
- <title>Handler Callback Functions</title>
- The following functions are to be exported from a handler
- callback module.
- </fsdescription>
- <func>
- <name since="OTP 21.0">Module:adding_handler(Config1) -> {ok, Config2} | {error,
-	Reason}</name>
- <fsummary>An instance of this handler is about to be added.</fsummary>
- <type>
-	<v>Config1 = Config2 =
-	 <seetype marker="#handler_config">handler_config()</seetype></v>
-	<v>Reason = term()</v>
- </type>
- <desc>
-	This callback function is optional.
-	The function is called on a temporary process when a new
-	 handler is about to be added. The purpose is to verify the
-	 configuration and initiate all resources needed by the
-	 handler.
-	The handler identity is associated with the <c>id</c> key
-	 in <c>Config1</c>.
-	If everything succeeds, the callback function can add
-	 possible default values or internal state values to the
-	 configuration, and return the adjusted map
-	 in <c>{ok,Config2}</c>.
-	If the configuration is faulty, or if the initiation fails,
-	 the callback function must return <c>{error,Reason}</c>.
- </desc>
- </func>
-
- <func>
- <name since="OTP 21.2">Module:changing_config(SetOrUpdate, OldConfig, NewConfig) -> {ok, Config} | {error, Reason}</name>
- <fsummary>The configuration for this handler is about to change.</fsummary>
- <type>
-	<v>SetOrUpdate = set | update</v>
-	<v>OldConfig = NewConfig = Config =
-	 <seetype marker="#handler_config">handler_config()</seetype></v>
-	<v>Reason = term()</v>
- </type>
- <desc>
-	This callback function is optional.
-	The function is called on a temporary process when the
-	 configuration for a handler is about to change. The purpose
-	 is to verify and act on the new configuration.
-	<c>OldConfig</c> is the existing configuration
-	 and <c>NewConfig</c> is the new configuration.
-	The handler identity is associated with the <c>id</c> key
-	 in <c>OldConfig</c>.
-	<c>SetOrUpdate</c> has the value <c>set</c> if the
-	 configuration change originates from a call to
-	 <seemfa marker="#set_handler_config/2">
-	 <c>set_handler_config/2,3</c></seemfa>, and <c>update</c>
-	 if it originates from <seemfa marker="#update_handler_config/2">
-	 <c>update_handler_config/2,3</c></seemfa>. The handler can
-	 use this parameter to decide how to update the value of
-	 the <c>config</c> field, that is, the handler specific
-	 configuration data. Typically, if <c>SetOrUpdate</c>
-	 equals <c>set</c>, values that are not specified must be
-	 given their default values. If <c>SetOrUpdate</c>
-	 equals <c>update</c>, the values found in <c>OldConfig</c>
-	 must be used instead.
-	If everything succeeds, the callback function must return a
-	 possibly adjusted configuration in <c>{ok,Config}</c>.
-	If the configuration is faulty, the callback function must
-	 return <c>{error,Reason}</c>.
- </desc>
- </func>
-
- <func>
- <name since="OTP 21.2">Module:filter_config(Config) -> FilteredConfig</name>
- <fsummary>Remove internal data from configuration.</fsummary>
- <type>
-	<v>Config = FilteredConfig =
-	 <seetype marker="#handler_config">handler_config()</seetype></v>
- </type>
- <desc>
-	This callback function is optional.
-	The function is called when one of the Logger API functions
-	 for fetching the handler configuration is called, for
-	 example
-	 <seemfa marker="#get_handler_config/1">
-	 <c>logger:get_handler_config/1</c></seemfa>.
-	It allows the handler to remove internal data fields from
-	 its configuration data before it is returned to the
-	 caller.
- </desc>
- </func>
-
- <func>
- <name since="OTP 21.0">Module:log(LogEvent, Config) -> void()</name>
- <fsummary>Log the given log event.</fsummary>
- <type>
-	<v>LogEvent =
-	 <seetype marker="#log_event">log_event()</seetype></v>
-	<v>Config =
-	 <seetype marker="#handler_config">handler_config()</seetype></v>
- </type>
- <desc>
-	This callback function is mandatory.
-	The function is called when all primary filters and all
-	 handler filters for the handler in question have passed for
-	 the given log event. It is called on the client process, that
-	 is, the process that issued the log event.
-	The handler identity is associated with the <c>id</c> key
-	 in <c>Config</c>.
-	The handler must log the event.
-	The return value from this function is ignored by
-	 Logger.
- </desc>
- </func>
-
- <func>
- <name since="OTP 21.0">Module:removing_handler(Config) -> ok</name>
- <fsummary>The given handler is about to be removed.</fsummary>
- <type>
-	<v>Config =
-	 <seetype marker="#handler_config">handler_config()</seetype></v>
- </type>
- <desc>
-	This callback function is optional.
-	The function is called on a temporary process when a
-	 handler is about to be removed. The purpose is to release
-	 all resources used by the handler.
-	The handler identity is associated with the <c>id</c> key
-	 in <c>Config</c>.
-	The return value is ignored by Logger.
- </desc>
- </func>
-
- </funcs>
-
 <section>
 <title>See Also</title>
 
@@ -1347,6 +1191,7 @@ logger:set_proxy_config(maps:merge(Old, Config)).
 <seeerl marker="stdlib:io"><c>io(3)</c></seeerl>,
 <seeerl marker="logger_disk_log_h"><c>logger_disk_log_h(3)</c></seeerl>,
 <seeerl marker="logger_filters"><c>logger_filters(3)</c></seeerl>,
+ <seeerl marker="logger_handler"><c>logger_handler(3)</c></seeerl>,
 <seeerl marker="logger_formatter"><c>logger_formatter(3)</c></seeerl>,
 <seeerl marker="logger_std_h"><c>logger_std_h(3)</c></seeerl>,
 <seeerl marker="stdlib:unicode"><c>unicode(3)</c></seeerl>
diff --git a/lib/kernel/doc/src/logger_chapter.xml b/lib/kernel/doc/src/logger_chapter.xml
index d35cef3465..302666cc3e 100644
--- a/lib/kernel/doc/src/logger_chapter.xml
+++ b/lib/kernel/doc/src/logger_chapter.xml
@@ -390,7 +390,7 @@ logger:debug(#{got => connection_request, id => Id, state => State},
 A handler is defined as a module exporting at least the
 following callback function:
 
- <pre><seemfa marker="logger#Module:log/2">log(LogEvent, Config) -> void()</seemfa></pre>
+ <pre><seemfa marker="logger_handler#Module:log/2">log(LogEvent, Config) -> void()</seemfa></pre>
 
 This function is called when a log event has passed through all
 primary filters, and all handler filters attached to the handler
@@ -408,9 +408,8 @@ logger:debug(#{got => connection_request, id => Id, state => State},
 handler module can export the optional callback
 functions <c>adding_handler/1</c>, <c>changing_config/3</c>,
 <c>filter_config/1</c>, and <c>removing_handler/1</c>. See
- section <seeerl marker="logger#handler_callback_functions">Handler
- Callback Functions</seeerl> in the logger(3) manual page for
- more information about these function.
+ <seeerl marker="logger_handler">logger_handler(3)</seeerl>
+ for more information about these function.
 
 The following built-in handlers exist:
 
@@ -453,7 +452,7 @@ logger:debug(#{got => connection_request, id => Id, state => State},
 handler's destination. The handler callback receives the
 formatter information as part of the handler configuration,
 which is passed as the second argument
- to <seemfa marker="logger#Module:log/2">
+ to <seemfa marker="logger_handler#Module:log/2">
 	<c>HModule:log/2</c></seemfa>.
 The formatter information consist of a formatter
 module, <c>FModule</c> and its
@@ -594,8 +593,8 @@ logger:debug(#{got => connection_request, id => Id, state => State},
 </list>
 The configuration for a handler is a map with the following keys:
 <taglist>
-	<tag><c>id = </c><seetype marker="logger#handler_id">
-	 <c>logger:handler_id()</c></seetype></tag>
+	<tag><c>id = </c><seetype marker="logger_handler#id">
+	 <c>logger_handler:id()</c></seetype></tag>
 	<item>
 	 Automatically inserted by Logger. The value is the same
 	 as the <c>HandlerId</c> specified when adding the handler,
@@ -1062,8 +1061,7 @@ ok</pre>
 
 <section>
 <title>Example: Implement a handler</title>
- Section <seeerl marker="logger#handler_callback_functions">Handler
-	Callback Functions</seeerl> in the logger(3) manual page
+ <seeerl marker="logger_handler">logger_handler(3)</seeerl>
 	describes the callback functions that can be implemented for a
 	Logger handler.
 A handler callback module must export:
diff --git a/lib/kernel/doc/src/logger_handler.xml b/lib/kernel/doc/src/logger_handler.xml
new file mode 100644
index 0000000000..204a2a2244
--- /dev/null
+++ b/lib/kernel/doc/src/logger_handler.xml
@@ -0,0 +1,224 @@
+<?xml version="1.0" encoding="utf-8" ?>
+<!DOCTYPE erlref SYSTEM "erlref.dtd">
+
+<erlref>
+ <header>
+ <copyright>
+ <year>2023</year><year>2023</year>
+ <holder>Ericsson AB. All Rights Reserved.</holder>
+ </copyright>
+ <legalnotice>
+ 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.
+
+ </legalnotice>
+
+ <title>logger_handler</title>
+ <prepared></prepared>
+ <responsible></responsible>
+ <docno></docno>
+ <approved></approved>
+ <checked></checked>
+ <date></date>
+ <rev>A</rev>
+ <file>logger_handler.xml</file>
+ </header>
+ <module since="OTP @OTP-XYZ@">logger_handler</module>
+ <modulesummary>logger_handler behavior module.</modulesummary>
+
+ <description>
+ The behaviour module for logger handlers. A logger handler
+ is a callback module that is called when a log event has passed
+ all filters and is ready to be logged somewhere. For more information
+ see <seeguide marker="logger_chapter#handlers">Handlers</seeguide> in
+ the Users Guide.
+ </description>
+
+ <datatypes>
+ <datatype>
+ <name name="config"/>
+ <desc>
+	Handler configuration data for Logger. The following
+	 default values apply:
+	<list>
+	 <item><c>level => all</c></item>
+	 <item><c>filter_default => log</c></item>
+	 <item><c>filters => []</c></item>
+	 <item><c>formatter => {logger_formatter, DefaultFormatterConfig</c>}</item>
+	</list>
+	In addition to these, the following fields are
+	 automatically inserted by Logger, values taken from the
+	 two first parameters
+	 to <seemfa marker="logger#add_handler/3"><c>logger:add_handler/3</c></seemfa>:
+	<list>
+	 <item><c>id => HandlerId</c></item>
+	 <item><c>module => Module</c></item>
+	</list>
+	These are read-only and cannot be changed in runtime.
+	Handler specific configuration data is inserted by the
+	 handler callback itself, in a sub structure associated with
+	 the field named <c>config</c>. See
+	 the <seeerl marker="logger_std_h"><c>logger_std_h(3)</c></seeerl>
+	 and <seeerl marker="logger_disk_log_h"><c>logger_disk_log_h(3)</c></seeerl>
+	 manual pages for information about the specific configuration
+	 for these handlers.
+	See the <seetype marker="logger_formatter#config">
+	 <c>logger_formatter(3)</c></seetype> manual page for
+	 information about the default configuration for this
+	 formatter.
+ </desc>
+ </datatype>
+ <datatype>
+ <name name="id"/>
+ <desc>
+	A unique identifier for a handler instance.
+ </desc>
+ </datatype>
+ </datatypes>
+
+ <funcs>
+ <func>
+ <name since="OTP 21.0">Module:adding_handler(Config1) -> {ok, Config2} | {error,
+	Reason}</name>
+ <fsummary>An instance of this handler is about to be added.</fsummary>
+ <type>
+	<v>Config1 = Config2 =
+	 <seetype marker="#config">config()</seetype></v>
+	<v>Reason = term()</v>
+ </type>
+ <desc>
+	This callback function is optional.
+	The function is called on a temporary process when a new
+	 handler is about to be added. The purpose is to verify the
+	 configuration and initiate all resources needed by the
+	 handler.
+	The handler identity is associated with the <c>id</c> key
+	 in <c>Config1</c>.
+	If everything succeeds, the callback function can add
+	 possible default values or internal state values to the
+	 configuration, and return the adjusted map
+	 in <c>{ok,Config2}</c>.
+	If the configuration is faulty, or if the initiation fails,
+	 the callback function must return <c>{error,Reason}</c>.
+ </desc>
+ </func>
+
+ <func>
+ <name since="OTP 21.2">Module:changing_config(SetOrUpdate, OldConfig, NewConfig) -> {ok, Config} | {error, Reason}</name>
+ <fsummary>The configuration for this handler is about to change.</fsummary>
+ <type>
+	<v>SetOrUpdate = set | update</v>
+	<v>OldConfig = NewConfig = Config =
+	 <seetype marker="#config">config()</seetype></v>
+	<v>Reason = term()</v>
+ </type>
+ <desc>
+	This callback function is optional.
+	The function is called on a temporary process when the
+	 configuration for a handler is about to change. The purpose
+	 is to verify and act on the new configuration.
+	<c>OldConfig</c> is the existing configuration
+	 and <c>NewConfig</c> is the new configuration.
+	The handler identity is associated with the <c>id</c> key
+	 in <c>OldConfig</c>.
+	<c>SetOrUpdate</c> has the value <c>set</c> if the
+	 configuration change originates from a call to
+	 <seemfa marker="logger#set_handler_config/2">
+	 <c>logger:set_handler_config/2,3</c></seemfa>, and <c>update</c>
+	 if it originates from <seemfa marker="logger#update_handler_config/2">
+	 <c>logger:update_handler_config/2,3</c></seemfa>. The handler can
+	 use this parameter to decide how to update the value of
+	 the <c>config</c> field, that is, the handler specific
+	 configuration data. Typically, if <c>SetOrUpdate</c>
+	 equals <c>set</c>, values that are not specified must be
+	 given their default values. If <c>SetOrUpdate</c>
+	 equals <c>update</c>, the values found in <c>OldConfig</c>
+	 must be used instead.
+	If everything succeeds, the callback function must return a
+	 possibly adjusted configuration in <c>{ok,Config}</c>.
+	If the configuration is faulty, the callback function must
+	 return <c>{error,Reason}</c>.
+ </desc>
+ </func>
+
+ <func>
+ <name since="OTP 21.2">Module:filter_config(Config) -> FilteredConfig</name>
+ <fsummary>Remove internal data from configuration.</fsummary>
+ <type>
+	<v>Config = FilteredConfig =
+	 <seetype marker="#config">config()</seetype></v>
+ </type>
+ <desc>
+	This callback function is optional.
+	The function is called when one of the Logger API functions
+	 for fetching the handler configuration is called, for
+	 example
+	 <seemfa marker="logger#get_handler_config/1">
+	 <c>logger:get_handler_config/1</c></seemfa>.
+	It allows the handler to remove internal data fields from
+	 its configuration data before it is returned to the
+	 caller.
+ </desc>
+ </func>
+
+ <func>
+ <name since="OTP 21.0">Module:log(LogEvent, Config) -> void()</name>
+ <fsummary>Log the given log event.</fsummary>
+ <type>
+	<v>LogEvent =
+	 <seetype marker="logger#log_event">logger:log_event()</seetype></v>
+	<v>Config =
+	 <seetype marker="#config">config()</seetype></v>
+ </type>
+ <desc>
+	This callback function is mandatory.
+	The function is called when all primary filters and all
+	 handler filters for the handler in question have passed for
+	 the given log event. It is called on the client process, that
+	 is, the process that issued the log event.
+	The handler identity is associated with the <c>id</c> key
+	 in <c>Config</c>.
+	The handler must log the event.
+	The return value from this function is ignored by
+	 Logger.
+ </desc>
+ </func>
+
+ <func>
+ <name since="OTP 21.0">Module:removing_handler(Config) -> ok</name>
+ <fsummary>The given handler is about to be removed.</fsummary>
+ <type>
+	<v>Config =
+	 <seetype marker="#config">config()</seetype></v>
+ </type>
+ <desc>
+	This callback function is optional.
+	The function is called on a temporary process when a
+	 handler is about to be removed. The purpose is to release
+	 all resources used by the handler.
+	The handler identity is associated with the <c>id</c> key
+	 in <c>Config</c>.
+	The return value is ignored by Logger.
+ </desc>
+ </func>
+
+ </funcs>
+
+ <section>
+ <title>See Also</title>
+ 
+ <seeerl marker="logger_filters"><c>logger_filters(3)</c></seeerl>,
+ <seeerl marker="logger_formatter"><c>logger_formatter(3)</c></seeerl>,
+ <seeerl marker="logger"><c>logger(3)</c></seeerl>
+ 
+ </section>
+</erlref>
diff --git a/lib/kernel/doc/src/ref_man.xml b/lib/kernel/doc/src/ref_man.xml
index 39973158d6..05c022e4ea 100644
--- a/lib/kernel/doc/src/ref_man.xml
+++ b/lib/kernel/doc/src/ref_man.xml
@@ -59,6 +59,7 @@
 <xi:include href="logger.xml"/>
 <xi:include href="logger_filters.xml"/>
 <xi:include href="logger_formatter.xml"/>
+ <xi:include href="logger_handler.xml"/>
 <xi:include href="logger_std_h.xml"/>
 <xi:include href="logger_disk_log_h.xml"/>
 <xi:include href="net.xml"/>
diff --git a/lib/kernel/doc/src/specs.xml b/lib/kernel/doc/src/specs.xml
index fd3877d9a8..ec7f0af552 100644
--- a/lib/kernel/doc/src/specs.xml
+++ b/lib/kernel/doc/src/specs.xml
@@ -25,6 +25,7 @@
 <xi:include href="../specs/specs_logger.xml"/>
 <xi:include href="../specs/specs_logger_filters.xml"/>
 <xi:include href="../specs/specs_logger_formatter.xml"/>
+ <xi:include href="../specs/specs_logger_handler.xml"/>
 <xi:include href="../specs/specs_logger_std_h.xml"/>
 <xi:include href="../specs/specs_logger_disk_log_h.xml"/>
 <xi:include href="../specs/specs_net.xml"/>
diff --git a/lib/kernel/src/Makefile b/lib/kernel/src/Makefile
index 929f1d2c4e..8ac4768674 100644
--- a/lib/kernel/src/Makefile
+++ b/lib/kernel/src/Makefile
@@ -119,6 +119,7 @@ MODULES = \
 logger \
 logger_backend \
 logger_config \
+	logger_handler \
 	logger_handler_watcher \
 	logger_std_h \
 	logger_disk_log_h \
@@ -185,6 +186,7 @@ APPUP_TARGET= $(EBIN)/$(APPUP_FILE)
 
 ERL_COMPILE_FLAGS += -Werror
 ERL_COMPILE_FLAGS += -I../include
+ERL_COMPILE_FLAGS += -pa ../ebin
 
 
 # ----------------------------------------------------
@@ -283,14 +285,14 @@ $(EBIN)/local_tcp.beam: inet_int.hrl
 $(EBIN)/logger.beam: logger_internal.hrl ../include/logger.hrl
 $(EBIN)/logger_backend.beam: logger_internal.hrl ../include/logger.hrl
 $(EBIN)/logger_config.beam: logger_internal.hrl ../include/logger.hrl
-$(EBIN)/logger_disk_log_h.beam: logger_h_common.hrl logger_internal.hrl ../include/logger.hrl ../include/file.hrl
+$(EBIN)/logger_disk_log_h.beam: $(EBIN)/logger_handler.beam logger_h_common.hrl logger_internal.hrl ../include/logger.hrl ../include/file.hrl
 $(EBIN)/logger_filters.beam: logger_internal.hrl ../include/logger.hrl
 $(EBIN)/logger_formatter.beam: logger_internal.hrl ../include/logger.hrl
 $(EBIN)/logger_olp.beam: logger_olp.hrl logger_internal.hrl
 $(EBIN)/logger_proxy.beam: logger_internal.hrl
 $(EBIN)/logger_server.beam: logger_internal.hrl ../include/logger.hrl
-$(EBIN)/logger_simple_h.beam: logger_internal.hrl ../include/logger.hrl
-$(EBIN)/logger_std_h.beam: logger_h_common.hrl logger_internal.hrl ../include/logger.hrl ../include/file.hrl
+$(EBIN)/logger_simple_h.beam: $(EBIN)/logger_handler.beam logger_internal.hrl ../include/logger.hrl
+$(EBIN)/logger_std_h.beam: $(EBIN)/logger_handler.beam logger_h_common.hrl logger_internal.hrl ../include/logger.hrl ../include/file.hrl
 $(EBIN)/logger_h_common.beam: logger_h_common.hrl logger_internal.hrl ../include/logger.hrl
 $(EBIN)/net_kernel.beam: ../include/net_address.hrl
 $(EBIN)/os.beam: ../include/file.hrl
diff --git a/lib/kernel/src/error_logger.erl b/lib/kernel/src/error_logger.erl
index 829f28f00d..c243fa9fd3 100644
--- a/lib/kernel/src/error_logger.erl
+++ b/lib/kernel/src/error_logger.erl
@@ -106,8 +106,8 @@ stop() ->
 
 %%%-----------------------------------------------------------------
 %%% Callbacks for logger
--spec adding_handler(logger:handler_config()) ->
- {ok,logger:handler_config()} | {error,term()}.
+-spec adding_handler(logger_handler:config()) ->
+ {ok,logger_handler:config()} | {error,term()}.
 adding_handler(#{id:=?MODULE}=Config) ->
 case start() of
 ok ->
@@ -116,12 +116,12 @@ adding_handler(#{id:=?MODULE}=Config) ->
 Error
 end.
 
--spec removing_handler(logger:handler_config()) -> ok.
+-spec removing_handler(logger_handler:config()) -> ok.
 removing_handler(#{id:=?MODULE}) ->
 stop(),
 ok.
 
--spec log(logger:log_event(),logger:handler_config()) -> ok.
+-spec log(logger:log_event(),logger_handler:config()) -> ok.
 log(#{level:=Level,msg:=Msg,meta:=Meta},_Config) ->
 do_log(Level,Msg,Meta).
 
diff --git a/lib/kernel/src/kernel.app.src b/lib/kernel/src/kernel.app.src
index 4ae0fb6bb5..a06840ac1c 100644
--- a/lib/kernel/src/kernel.app.src
+++ b/lib/kernel/src/kernel.app.src
@@ -72,6 +72,7 @@
 logger_filters,
 logger_formatter,
 logger_h_common,
+ logger_handler,
 logger_handler_watcher,
 logger_olp,
 logger_proxy,
diff --git a/lib/kernel/src/logger.erl b/lib/kernel/src/logger.erl
index 83f7aeba2a..14f47ddf9b 100644
--- a/lib/kernel/src/logger.erl
+++ b/lib/kernel/src/logger.erl
@@ -103,7 +103,6 @@
 -type location() :: #{mfa := {module(),atom(),non_neg_integer()},
 file := file:filename(),
 line := non_neg_integer()}.
--type handler_id() :: atom().
 -type filter_id() :: atom().
 -type filter() :: {fun((log_event(),filter_arg()) ->
 filter_return()),filter_arg()}.
@@ -113,17 +112,10 @@
 metadata => metadata(),
 filter_default => log | stop,
 filters => [{filter_id(),filter()}]}.
--type handler_config() :: #{id => handler_id(),
- config => term(),
- level => level() | all | none,
- module => module(),
- filter_default => log | stop,
- filters => [{filter_id(),filter()}],
- formatter => {module(),formatter_config()}}.
 -type timestamp() :: integer().
 -type formatter_config() :: #{atom() => term()}.
 
--type config_handler() :: {handler, handler_id(), module(), handler_config()}.
+-type config_handler() :: {handler, logger_handler:id(), module(), logger_handler:config()}.
 
 -type config_logger() :: [{handler,default,undefined} |
 config_handler() |
@@ -142,6 +134,10 @@
 overload_kill_restart_after =>
 non_neg_integer() | infinity}.
 
+%% Kept for backwards compatibility
+-type handler_id() :: logger_handler:id().
+-type handler_config() :: logger_handler:config().
+
 -export_type([log_event/0,
 level/0,
 report/0,
@@ -161,31 +157,6 @@
 olp_config/0,
 timestamp/0]).
 
-%%%-----------------------------------------------------------------
-%%% Callbacks
--callback adding_handler(Config1) -> {ok, Config2} | {error, Reason} when
- Config1 :: handler_config(),
- Config2 :: handler_config(),
- Reason :: term().
-
--callback changing_config(SetOrUpdate, OldConfig, NewConfig) ->
- {ok, Config} | {error, Reason} when
- SetOrUpdate :: set | update,
- OldConfig :: handler_config(),
- NewConfig :: handler_config(),
- Config :: handler_config(),
- Reason :: term().
-
--callback filter_config(Config) -> FilteredConfig when
- Config :: handler_config(),
- FilteredConfig :: handler_config().
-
--callback log(LogEvent, Config) -> term() when
- LogEvent :: log_event(), Config :: handler_config().
-
--callback removing_handler(Config) -> ok when
- Config :: handler_config().
-
 %%%-----------------------------------------------------------------
 %%% API
 emergency(X) ->
@@ -399,7 +370,7 @@ add_primary_filter(FilterId,Filter) ->
 logger_server:add_filter(primary,{FilterId,Filter}).
 
 -spec add_handler_filter(HandlerId,FilterId,Filter) -> ok | {error,term()} when
- HandlerId :: handler_id(),
+ HandlerId :: logger_handler:id(),
 FilterId :: filter_id(),
 Filter :: filter().
 add_handler_filter(HandlerId,FilterId,Filter) ->
@@ -412,20 +383,20 @@ remove_primary_filter(FilterId) ->
 logger_server:remove_filter(primary,FilterId).
 
 -spec remove_handler_filter(HandlerId,FilterId) -> ok | {error,term()} when
- HandlerId :: handler_id(),
+ HandlerId :: logger_handler:id(),
 FilterId :: filter_id().
 remove_handler_filter(HandlerId,FilterId) ->
 logger_server:remove_filter(HandlerId,FilterId).
 
 -spec add_handler(HandlerId,Module,Config) -> ok | {error,term()} when
- HandlerId :: handler_id(),
+ HandlerId :: logger_handler:id(),
 Module :: module(),
- Config :: handler_config().
+ Config :: logger_handler:config().
 add_handler(HandlerId,Module,Config) ->
 logger_server:add_handler(HandlerId,Module,Config).
 
 -spec remove_handler(HandlerId) -> ok | {error,term()} when
- HandlerId :: handler_id().
+ HandlerId :: logger_handler:id().
 remove_handler(HandlerId) ->
 logger_server:remove_handler(HandlerId).
 
@@ -447,31 +418,31 @@ set_primary_config(Config) ->
 
 
 -spec set_handler_config(HandlerId,level,Level) -> Return when
- HandlerId :: handler_id(),
+ HandlerId :: logger_handler:id(),
 Level :: level() | all | none,
 Return :: ok | {error,term()};
 (HandlerId,filter_default,FilterDefault) -> Return when
- HandlerId :: handler_id(),
+ HandlerId :: logger_handler:id(),
 FilterDefault :: log | stop,
 Return :: ok | {error,term()};
 (HandlerId,filters,Filters) -> Return when
- HandlerId :: handler_id(),
+ HandlerId :: logger_handler:id(),
 Filters :: [{filter_id(),filter()}],
 Return :: ok | {error,term()};
 (HandlerId,formatter,Formatter) -> Return when
- HandlerId :: handler_id(),
+ HandlerId :: logger_handler:id(),
 Formatter :: {module(), formatter_config()},
 Return :: ok | {error,term()};
 (HandlerId,config,Config) -> Return when
- HandlerId :: handler_id(),
+ HandlerId :: logger_handler:id(),
 Config :: term(),
 Return :: ok | {error,term()}.
 set_handler_config(HandlerId,Key,Value) ->
 logger_server:set_config(HandlerId,Key,Value).
 
 -spec set_handler_config(HandlerId,Config) -> ok | {error,term()} when
- HandlerId :: handler_id(),
- Config :: handler_config().
+ HandlerId :: logger_handler:id(),
+ Config :: logger_handler:config().
 set_handler_config(HandlerId,Config) ->
 logger_server:set_config(HandlerId,Config).
 
@@ -486,31 +457,31 @@ update_primary_config(Config) ->
 logger_server:update_config(primary,Config).
 
 -spec update_handler_config(HandlerId,level,Level) -> Return when
- HandlerId :: handler_id(),
+ HandlerId :: logger_handler:id(),
 Level :: level() | all | none,
 Return :: ok | {error,term()};
 (HandlerId,filter_default,FilterDefault) -> Return when
- HandlerId :: handler_id(),
+ HandlerId :: logger_handler:id(),
 FilterDefault :: log | stop,
 Return :: ok | {error,term()};
 (HandlerId,filters,Filters) -> Return when
- HandlerId :: handler_id(),
+ HandlerId :: logger_handler:id(),
 Filters :: [{filter_id(),filter()}],
 Return :: ok | {error,term()};
 (HandlerId,formatter,Formatter) -> Return when
- HandlerId :: handler_id(),
+ HandlerId :: logger_handler:id(),
 Formatter :: {module(), formatter_config()},
 Return :: ok | {error,term()};
 (HandlerId,config,Config) -> Return when
- HandlerId :: handler_id(),
+ HandlerId :: logger_handler:id(),
 Config :: term(),
 Return :: ok | {error,term()}.
 update_handler_config(HandlerId,Key,Value) ->
 logger_server:update_config(HandlerId,Key,Value).
 
 -spec update_handler_config(HandlerId,Config) -> ok | {error,term()} when
- HandlerId :: handler_id(),
- Config :: handler_config().
+ HandlerId :: logger_handler:id(),
+ Config :: logger_handler:config().
 update_handler_config(HandlerId,Config) ->
 logger_server:update_config(HandlerId,Config).
 
@@ -526,8 +497,8 @@ get_primary_config() ->
 maps:remove(handlers,Config).
 
 -spec get_handler_config(HandlerId) -> {ok,Config} | {error,term()} when
- HandlerId :: handler_id(),
- Config :: handler_config().
+ HandlerId :: logger_handler:id(),
+ Config :: logger_handler:config().
 get_handler_config(HandlerId) ->
 case logger_config:get(?LOGGER_TABLE,HandlerId) of
 {ok,#{module:=Module}=Config} ->
@@ -539,7 +510,7 @@ get_handler_config(HandlerId) ->
 end.
 
 -spec get_handler_config() -> [Config] when
- Config :: handler_config().
+ Config :: logger_handler:config().
 get_handler_config() ->
 [begin
 {ok,Config} = get_handler_config(HandlerId),
@@ -547,7 +518,7 @@ get_handler_config() ->
 end || HandlerId <- get_handler_ids()].
 
 -spec get_handler_ids() -> [HandlerId] when
- HandlerId :: handler_id().
+ HandlerId :: logger_handler:id().
 get_handler_ids() ->
 {ok,#{handlers:=HandlerIds}} = logger_config:get(?LOGGER_TABLE,primary),
 HandlerIds.
@@ -560,14 +531,14 @@ get_proxy_config() ->
 
 -spec update_formatter_config(HandlerId,FormatterConfig) ->
 ok | {error,term()} when
- HandlerId :: handler_id(),
+ HandlerId :: logger_handler:id(),
 FormatterConfig :: formatter_config().
 update_formatter_config(HandlerId,FormatterConfig) ->
 logger_server:update_formatter_config(HandlerId,FormatterConfig).
 
 -spec update_formatter_config(HandlerId,Key,Value) ->
 ok | {error,term()} when
- HandlerId :: handler_id(),
+ HandlerId :: logger_handler:id(),
 Key :: atom(),
 Value :: term().
 update_formatter_config(HandlerId,Key,Value) ->
@@ -677,7 +648,7 @@ unset_process_metadata() ->
 ok.
 
 -spec get_config() -> #{primary=>primary_config(),
- handlers=>[handler_config()],
+ handlers=>[logger_handler:config()],
 proxy=>olp_config(),
 module_levels=>[{module(),level() | all | none}]}.
 get_config() ->
@@ -699,7 +670,7 @@ i() ->
 i_modules(Modules,M).
 
 -spec i(What) -> ok when
- What :: primary | handlers | proxy | modules | handler_id().
+ What :: primary | handlers | proxy | modules | logger_handler:id().
 i(primary) ->
 i_primary(get_primary_config(),modifier());
 i(handlers) ->
diff --git a/lib/kernel/src/logger_disk_log_h.erl b/lib/kernel/src/logger_disk_log_h.erl
index 2f386acbf3..ca209ace8e 100644
--- a/lib/kernel/src/logger_disk_log_h.erl
+++ b/lib/kernel/src/logger_disk_log_h.erl
@@ -26,6 +26,8 @@
 %%% API
 -export([filesync/1]).
 
+-behaviour(logger_handler).
+
 %% logger_h_common callbacks
 -export([init/2, check_config/4, reset_state/2,
 filesync/3, write/4, handle_info/3, terminate/3]).
@@ -70,7 +72,7 @@ removing_handler(Config) ->
 %%% Log a string or report
 -spec log(LogEvent,Config) -> ok when
 LogEvent :: logger:log_event(),
- Config :: logger:handler_config().
+ Config :: logger_handler:config().
 
 log(LogEvent,Config) ->
 logger_h_common:log(LogEvent,Config).
diff --git a/lib/kernel/src/logger_h_common.erl b/lib/kernel/src/logger_h_common.erl
index 3c99d49f3d..99c258c40f 100644
--- a/lib/kernel/src/logger_h_common.erl
+++ b/lib/kernel/src/logger_h_common.erl
@@ -168,7 +168,7 @@ changing_config(SetOrUpdate,
 %%% Log a string or report
 -spec log(LogEvent, Config) -> ok when
 LogEvent :: logger:log_event(),
- Config :: logger:handler_config().
+ Config :: logger_handler:config().
 
 log(LogEvent, Config = #{config := #{olp:=Olp}}) ->
 %% if the handler has crashed, we must drop this event
@@ -379,7 +379,7 @@ log_handler_info(Name, Format, Args, #{module:=Module,
 %%% Convert log data on any form to binary
 -spec log_to_binary(LogEvent,Config) -> LogString when
 LogEvent :: logger:log_event(),
- Config :: logger:handler_config(),
+ Config :: logger_handler:config(),
 LogString :: binary().
 log_to_binary(#{msg:={report,_},meta:=#{report_cb:=_}}=Log,Config) ->
 do_log_to_binary(Log,Config);
diff --git a/lib/kernel/src/logger_handler.erl b/lib/kernel/src/logger_handler.erl
new file mode 100644
index 0000000000..f8aef0fe6e
--- /dev/null
+++ b/lib/kernel/src/logger_handler.erl
@@ -0,0 +1,61 @@
+%%
+%% %CopyrightBegin%
+%%
+%% Copyright Ericsson AB 2023-2023. All Rights Reserved.
+%%
+%% 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.
+%%
+%% %CopyrightEnd%
+%%
+-module(logger_handler).
+
+%%%
+%%% Types
+-type config() :: #{id => id(),
+ config => term(),
+ level => logger:level() | all | none,
+ module => module(),
+ filter_default => log | stop,
+ filters => [{logger:filter_id(),logger:filter()}],
+ formatter => {module(),logger:formatter_config()}}.
+-type id() :: atom().
+
+-export_type([config/0, id/0]).
+
+%%%-----------------------------------------------------------------
+%%% Callbacks
+-callback adding_handler(Config1) -> {ok, Config2} | {error, Reason} when
+ Config1 :: config(),
+ Config2 :: config(),
+ Reason :: term().
+
+-callback changing_config(SetOrUpdate, OldConfig, NewConfig) ->
+ {ok, Config} | {error, Reason} when
+ SetOrUpdate :: set | update,
+ OldConfig :: config(),
+ NewConfig :: config(),
+ Config :: config(),
+ Reason :: term().
+
+-callback filter_config(Config) -> FilteredConfig when
+ Config :: config(),
+ FilteredConfig :: config().
+
+-callback log(LogEvent, Config) -> term() when
+ LogEvent :: logger:log_event(), Config :: config().
+
+-callback removing_handler(Config) -> ok when
+ Config :: config().
+
+-optional_callbacks([adding_handler/1, changing_config/3,
+ filter_config/1, removing_handler/1]).
diff --git a/lib/kernel/src/logger_handler_watcher.erl b/lib/kernel/src/logger_handler_watcher.erl
index 6f622b169c..1e4cd4ce48 100644
--- a/lib/kernel/src/logger_handler_watcher.erl
+++ b/lib/kernel/src/logger_handler_watcher.erl
@@ -43,7 +43,7 @@
 start_link() ->
 gen_server:start_link({local, ?SERVER}, ?MODULE, [], []).
 
--spec register_handler(Id::logger:handler_id(),Pid::pid()) -> ok.
+-spec register_handler(Id :: logger_handler:id(), Pid :: pid()) -> ok.
 register_handler(Id,Pid) ->
 gen_server:call(?SERVER,{register,Id,Pid}).
 
diff --git a/lib/kernel/src/logger_simple_h.erl b/lib/kernel/src/logger_simple_h.erl
index d35c533b6d..cd677e505b 100644
--- a/lib/kernel/src/logger_simple_h.erl
+++ b/lib/kernel/src/logger_simple_h.erl
@@ -21,6 +21,8 @@
 
 -export([adding_handler/1, removing_handler/1, log/2]).
 
+-behaviour(logger_handler).
+
 %% This module implements a simple handler for logger. It is the
 %% default used during system start.
 
diff --git a/lib/kernel/src/logger_std_h.erl b/lib/kernel/src/logger_std_h.erl
index 1b2fabad72..d90f9b2acb 100644
--- a/lib/kernel/src/logger_std_h.erl
+++ b/lib/kernel/src/logger_std_h.erl
@@ -28,6 +28,8 @@
 %% API
 -export([filesync/1]).
 
+-behaviour(logger_handler).
+
 %% logger_h_common callbacks
 -export([init/2, check_config/4, config_changed/3, reset_state/2,
 filesync/3, write/4, handle_info/3, terminate/3]).
@@ -58,7 +60,7 @@ filesync(Name) ->
 %%%-----------------------------------------------------------------
 %%% Handler being added
 -spec adding_handler(Config) -> {ok,Config} | {error,Reason} when
- Config :: logger:handler_config(),
+ Config :: logger_handler:config(),
 Reason :: term().
 
 adding_handler(Config) ->
@@ -69,9 +71,9 @@ adding_handler(Config) ->
 -spec changing_config(SetOrUpdate, OldConfig, NewConfig) ->
 {ok,Config} | {error,Reason} when
 SetOrUpdate :: set | update,
- OldConfig :: logger:handler_config(),
- NewConfig :: logger:handler_config(),
- Config :: logger:handler_config(),
+ OldConfig :: logger_handler:config(),
+ NewConfig :: logger_handler:config(),
+ Config :: logger_handler:config(),
 Reason :: term().
 
 changing_config(SetOrUpdate, OldConfig, NewConfig) ->
@@ -80,7 +82,7 @@ changing_config(SetOrUpdate, OldConfig, NewConfig) ->
 %%%-----------------------------------------------------------------
 %%% Handler being removed
 -spec removing_handler(Config) -> ok when
- Config :: logger:handler_config().
+ Config :: logger_handler:config().
 
 removing_handler(Config) ->
 logger_h_common:removing_handler(Config).
@@ -89,7 +91,7 @@ removing_handler(Config) ->
 %%% Log a string or report
 -spec log(LogEvent, Config) -> ok when
 LogEvent :: logger:log_event(),
- Config :: logger:handler_config().
+ Config :: logger_handler:config().
 
 log(LogEvent, Config) ->
 logger_h_common:log(LogEvent, Config).
@@ -97,7 +99,7 @@ log(LogEvent, Config) ->
 %%%-----------------------------------------------------------------
 %%% Remove internal fields from configuration
 -spec filter_config(Config) -> Config when
- Config :: logger:handler_config().
+ Config :: logger_handler:config().
 
 filter_config(Config) ->
 logger_h_common:filter_config(Config).
-- 
2.35.3

Places

File 6865-kernel-Add-logger_handler-callbacks.patch of Package erlang (Revision 7ca8474baff281f894ff6ebde8ccfe01)

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