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authorSiri Hansen <[email protected]>2018-04-24 14:26:31 +0200
committerSiri Hansen <[email protected]>2018-04-26 14:37:30 +0200
commit0deea4a8f369013ec00e231d0c2c37e4ab3f0ba1 (patch)
tree054b8465a9eb07b07fde4596f2209ee1df689a92 /lib/kernel/doc/src/logger_formatter.xml
parent0183ddffb112d898d9b8c0396afa7f2210b9e169 (diff)
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Add logger
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+<?xml version="1.0" encoding="utf-8" ?>
+<!DOCTYPE erlref SYSTEM "erlref.dtd">
+
+<erlref>
+ <header>
+ <copyright>
+ <year>2017</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_formatter</title>
+ <prepared></prepared>
+ <responsible></responsible>
+ <docno></docno>
+ <approved></approved>
+ <checked></checked>
+ <date></date>
+ <rev>A</rev>
+ <file>logger_formatter.xml</file>
+ </header>
+ <module>logger_formatter</module>
+ <modulesummary>Default formatter for the Logger application.</modulesummary>
+
+ <description>
+ <p>Default formatter for the Logger application.</p>
+ </description>
+
+ <datatypes>
+ <datatype>
+ <name name="template"/>
+ <desc>
+ </desc>
+ </datatype>
+ </datatypes>
+
+ <funcs>
+ <func>
+ <name name="format" arity="2"/>
+ <fsummary>Formats the given message.</fsummary>
+ <desc>
+ <p>Formats the given message.</p>
+ <p>The template is a list of atoms, tuples and strings. Atoms
+ can be <c>level</c> or <c>msg</c>, which are placeholders
+ for the severity level and the log message,
+ repectively. Tuples are interpreted as placeholders for
+ metadata. Each element in the tuple must be an atom which
+ matches a key in the nested metadata map, e.g. the
+ tuple <c>{key1,key2}</c> will be replaced by the value of
+ the key2 field in this nested map (the value vill be
+ converted to a string):</p>
+
+<code>
+#{key1=>#{key2=>my_value,
+ ...},
+ ...}</code>
+
+
+ <p> Strings are printed literally.</p>
+
+ <p><c>depth</c> is a positive integer representing the maximum
+ depth to which terms shall be printed by this
+ formatter. Format strings passed to this formatter are
+ rewritten. The format controls ~p and ~w are replaced with
+ ~P and ~W, respectively, and the value is used as the depth
+ parameter. For details, see
+ <seealso marker="stdlib:io#format-2">io:format/2</seealso>
+ in STDLIB.</p>
+
+ <p><c>max_size</c> is a positive integer representing the
+ maximum size a string returned from this formatter can
+ have. If the formatted string is longer, it will be
+ truncated.</p>
+
+ <p><c>utc</c> is a boolean. If set to true, all dates are
+ displayed in Universal Coordinated Time. Default
+ is <c>false</c>.</p>
+
+ <p><c>report_cb</c> must be a function with arity 1,
+ returning <c>{Format,Args}</c>. This function will replace
+ any <c>report_cb</c> found in metadata.</p>
+
+ <p>If <c>single_line=true</c>, all newlines in the message are
+ replaced with <c>", "</c>, and whitespaces following directly
+ after newlines are removed. Note that newlines added by the
+ formatter template are not replaced.</p>
+
+ <p>If <c>legacy_header=true</c> a header field is added to
+ logger_formatter's part of <c>Metadata</c>. The value of
+ this field is a string similar to the header created by the
+ old <c>error_logger</c> event handlers. It can be included
+ in the log event by adding the
+ tuple <c>{logger_formatter,header}</c> to the template.</p>
+
+ <p>The default template when <c>legacy_header=true</c> is</p>
+
+ <code>[{logger_formatter,header},"\n",msg,"\n"]</code>
+
+ <p>which will cause log entries like this:</p>
+
+ <code>=ERROR REPORT==== 29-Dec-2017::13:30:51.245123 ===
+ process: &lt;0.74.0&gt;
+ exit_reason: "Something went wrong"</code>
+
+ <p>Note that all eight levels might occur here, not
+ only <c>ERROR</c>, <c>WARNING</c> or <c>INFO</c>. And also
+ that micro seconds are added at the end of the
+ timestamp.</p>
+
+ <p>The default template when <c>single_line=true</c> is</p>
+
+ <code>[time," ",level,": ",msg,"\n"]</code>
+
+ <p>which will cause log entries like this:</p>
+
+ <code>2017-12-29 13:31:49.640317 error: process: &lt;0.74.0&gt;, exit_reason: "Something went wrong"</code>
+
+ <p>The default template when both <c>legacy_header</c> and
+ <c>single_line</c> are set to false is:</p>
+
+ <code>[time," ",level,":\n",msg,"\n"]</code>
+
+ <p>which will cause log entries like this:</p>
+
+ <code>2017-12-29 13:32:25.191925 error:
+ process: &lt;0.74.0&gt;
+ exit_reason: "Something went wrong"</code>
+
+ </desc>
+ </func>
+
+ </funcs>
+
+</erlref>
+
+