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authorSiri Hansen <[email protected]>2018-05-02 11:50:49 +0200
committerSiri Hansen <[email protected]>2018-05-03 11:52:37 +0200
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Update logger documentation
Diffstat (limited to 'lib/kernel/doc/src/logger_formatter.xml')
-rw-r--r--lib/kernel/doc/src/logger_formatter.xml217
1 files changed, 129 insertions, 88 deletions
diff --git a/lib/kernel/doc/src/logger_formatter.xml b/lib/kernel/doc/src/logger_formatter.xml
index 6a17e3641f..a0940100ee 100644
--- a/lib/kernel/doc/src/logger_formatter.xml
+++ b/lib/kernel/doc/src/logger_formatter.xml
@@ -37,116 +37,157 @@
<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/2,3</seealso>
- in STDLIB.</p>
-
- <p><c>chars_limit</c> is a positive integer representing the
- value of the option with the same name to be used when calling
- <seealso marker="stdlib:io#format-3">io:format/3</seealso>. This
- value limits the total number of characters printed bu the
- formatter. Notes that this is a soft limit. For a hard
- truncation limit, see option <c>max_size</c>.</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, after possibly
- being limited by <c>depth</c> and/or <c>chars_limit</c>, 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>
+ </description>
- <p>If <c>legacy_header=true</c> a header field is added to
+ <section>
+ <title>Configuration</title>
+ <p>The following configuration parameters can be set
+ for <c>logger_formatter</c>:</p>
+ <taglist>
+ <tag><c>single_line = boolean()</c></tag>
+ <item>
+ <p>If set to <c>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>Default is <c>true</c>.</p>
+ </item>
+ <tag><c>legacy_header = boolen()</c></tag>
+ <item>
+ <p>If set to <c>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>
+ tuple <c>{logger_formatter,header}</c> to the
+ template. See <seealso marker="#default_templates">Default
+ Templates</seealso> for more information</p>
+ <p>Default is <c>false</c>.</p>
+ </item>
+ <tag><c>report_cb = fun((logger:report()) -> {io:format(),[term()]})</c></tag>
+ <item>
+ <p>A function with arity 1,
+ returning <c>{Format,Args}</c>. This function will replace
+ any <c>report_cb</c> found in metadata.</p>
+ </item>
+ <tag><c>depth = pos_integer() | unlimited</c></tag>
+ <item>
+ <p>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/2,3</seealso>
+ in STDLIB.</p>
+ <p>Default is <c>unlimited</c>.</p>
+ </item>
+ <tag><c>chars_limit = pos_integer() | unlimited</c></tag>
+ <item>
+ <p>A positive integer representing the value of the option
+ with the same name to be used when calling
+ <seealso marker="stdlib:io_lib#format-3">io_lib:format/3</seealso>.
+ This value limits the total number of characters printed
+ for each log event. Note that this is a soft limit. For a
+ hard truncation limit, see option <c>max_size</c>.</p>
+ <p>Default is <c>unlimited</c>.</p>
+ </item>
+ <tag><c>max_size = pos_integer() | unlimited</c></tag>
+ <item>
+ <p>A positive integer representing the absolute maximum size
+ a string returned from this formatter can have. If the
+ formatted string is longer, after possibly being limited
+ by <c>depth</c> and/or <c>chars_limit</c>, it will be
+ truncated.</p>
+ <p>Default is <c>unlimited</c>.</p>
+ </item>
+ <tag><c>template = </c><seealso marker="#type-template"><c>template()</c></seealso></tag>
+ <item>
+ <p>The template is a list of atoms, tuples and strings. The
+ atoms <c>level</c> or <c>msg</c>, are treated as
+ placeholders for the severity level and the log message,
+ repectively. Other atoms or tuples are interpreted as
+ placeholders for metadata, where atoms are expected to
+ match top level keys, and tuples represent paths to sub
+ keys in a nested map. For example the
+ tuple <c>{key1,key2}</c> will be replaced by the value of
+ the <c>key2</c> field in the nested map below. The
+ atom <c>key1</c> on its own would be replaced by the
+ complete value of the <c>key1</c> field. The values are
+ converted to strings.</p>
- <p>which will cause log entries like this:</p>
+<code>
+#{key1=>#{key2=>my_value,
+ ...}
+ ...}</code>
- <code>=ERROR REPORT==== 29-Dec-2017::13:30:51.245123 ===
+ <p>Strings are printed literally.</p>
+ <p>The default template differs depending on the values
+ of <c>legacy_header</c>
+ and <c>single_line</c>. See <seealso marker="#default_templates">Default
+ Templates</seealso> for more information</p>
+ </item>
+ <tag><c>utc = boolean()</c></tag>
+ <item>
+ <p>If set to <c>true</c>, all dates are displayed in Universal
+ Coordinated Time. Default is <c>false</c>.</p>
+ </item>
+ </taglist>
+ </section>
+
+ <section>
+ <marker id="default_templates"/>
+ <title>Default templates</title>
+ <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>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>
+ <p>The default template when <c>single_line=true</c> is</p>
- <code>[time," ",level,": ",msg,"\n"]</code>
+ <code>[time," ",level,": ",msg,"\n"]</code>
- <p>which will cause log entries like this:</p>
+ <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>
+ <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>
+ <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>
+ <code>[time," ",level,":\n",msg,"\n"]</code>
- <p>which will cause log entries like this:</p>
+ <p>which will cause log entries like this:</p>
- <code>2017-12-29 13:32:25.191925 error:
+ <code>2017-12-29 13:32:25.191925 error:
process: &lt;0.74.0&gt;
exit_reason: "Something went wrong"</code>
+ </section>
+
+ <datatypes>
+ <datatype>
+ <name name="template"/>
+ <desc>
+ </desc>
+ </datatype>
+ </datatypes>
+ <funcs>
+ <func>
+ <name name="format" arity="2"/>
+ <fsummary>Formats the given message.</fsummary>
+ <desc>
+ <p>This the callback function to be called from handlers. It
+ formats the given messages.</p>
</desc>
</func>