1Object::Remote::LoggingU:s:eLrogCgoenrt(r3i)buted Perl DOobcjuemcetn:t:aRteimoonte::Logging::Logger(3)
2
6 Object::Remote::Logging::Logger - Format and output a log message
7
9 use Object::Remote::Logging::Logger;
10 use Object::Remote::Logging qw( router arg_levels );
11 my $app_output = Object::Remote::Logging::Logger->new(
13 level_names => arg_levels, format => '%t %s',
14 min_level => 'verbose', max_level => 'info',
15 );
16 #Selector method can return 0 or more logger
18 #objects that will receive the messages
19 my $selector = sub {
20 my ($generating_package, $metadata) = @_;
21 return unless $metadata->{exporter} eq 'App::Logging::Subclass';
22 return $app_output;
23 };
24 #true value as second argument causes the selector
26 #to be stored with a weak reference
27 router->connect($selector, 1);
28 #disconnect the selector from the router
30 undef($selector);
31 #router will hold this logger forever
33 #and send it all log messages
34 router->connect(Object::Remote::Logging::Logger->new(
35 level_names => arg_levels, format => '%s at %f line %i, log level: %l'
36 min_level => 'warn', max_level => 'error',
37 ));
38
40 This class receives log messages from an instance of
41 Object::Remote::Logging::Router, formats them according to
42 configuration, and then outputs them to STDERR. In between the router
43 and the logger is a selector method which inspects the log message
44 metadata and can return 0 or more loggers that should receive the log
45 message.
46
48 A logger object receives the log messages that are generated and
49 converts them to formatted log entries then displays them to the end
50 user. Each logger has a set of active log levels and will only output a
51 log entry if the log message is at an active log level.
52 To gain access to the stream of log messages a connection is made to
54 the log router. A logger can directly connect to the router and
55 receive an unfiltered stream of log messages or a selector closure can
56 be used instead. The selector will be executed for each log message
57 with the message metadata and returns a list of 0 or more loggers that
58 should receive the log message. When the selector is executed the first
59 argument is the name of the package that generated the log message and
60 the second argument is a hash reference containing the message
61 metadata.
62
64 The message metadata is a hash reference with the following keys:
65 message_level
67 Name of the log level of the message.
68 exporter
70 Package name of the logging API that was used to generate the log
71 message.
72 caller_package
74 Name of the package that generated the log message.
75 method
77 Name of the method the message was generated inside of.
78 timestamp
80 Unix time of the message generation.
81 pid Process id of the Perl interpreter the message was generated in.
83 hostname
85 Hostname of the system where the message was generated.
86 filename
88 Name of the file the message was generated in.
89 line
91 Line of the source file the message was generated at.
92 object_remote
94 This is a reference to another hash that contains the
95 Object::Remote specific information. The keys are
96 connection_id
98 If the log message was generated on a remote Perl interpreter
99 then the Object::Remote::Connection id of that interpreter will
100 be available here.
101
103 level_names
104 This is a required attribute. Must be an array ref with the list of
105 log level names in it. The list must be ordered with the lowest
106 level as element 0 and the highest level as the last element. There
107 is no default value.
108 min_level
110 The lowest log level that will be output by the logger. There is no
111 default value.
112 max_level
114 The highest log level that will be output by the logger. The
115 default value is the highest level present in level_names.
116 format
118 The printf style format string to use when rendering the log
119 message. The following sequences are significant:
120 %l Level name that the log message was generated at.
122 %s Log message rendered into a string with a leading space before
124 any additional lines in a multiple line message.
125 %t Time the log message was generated rendered into a string. The
127 time value is taken from the Perl interpreter that generated
128 the log message; it is not the time that the logger received
129 the log message on the local interpreter if the log message was
130 forwarded.
131 %r Object::Remote connection information rendered into a string.
133 %c Package name of the logging API that was used to generate the
135 log message.
136 %p Name of the package that generated the log message.
138 %m Method name that generated the log message.
140 %f Filename that the log message was generated in.
142 %i Line number the log message was generated at.
144 %h Hostname the log message was generated on.
146 %P Process id of the Perl interpreter that generated the log
148 message.
149 %% A literal %.
151 %n A newline.
153perl v5.36.0 2023-01-20Object::Remote::Logging::Logger(3)