1 package Object::Remote::Logging::Logger;
4 use Scalar::Util qw(weaken);
7 #TODO sigh invoking a logger with a log level name the same
8 #as an attribute could happen - restrict attributes to _ prefix
9 #and restrict log levels to not start with out that prefix?
10 has format => ( is => 'ro', required => 1, default => sub { '%l: %s' } );
11 has level_names => ( is => 'ro', required => 1 );
12 has min_level => ( is => 'ro', required => 1, default => sub { 'info' } );
13 has max_level => ( is => 'lazy', required => 1 );
14 has _level_active => ( is => 'lazy' );
16 #just a stub so it doesn't get to AUTOLOAD
22 (my $method) = (our $AUTOLOAD =~ /([^:]+)$/);
26 if ($method =~ m/^_/) {
27 croak "invalid method name $method for " . ref($self);
30 if ($method =~ m/^is_(.+)/) {
32 my $is_method = "is_$level_name";
33 *{$is_method} = sub { shift(@_)->_level_active->{$level_name} };
34 return $self->$is_method;
37 my $level_name = $method;
38 *{$level_name} = sub {
40 unless(exists($self->_level_active->{$level_name})) {
41 croak "$level_name is not a valid log level name";
44 $self->_log($level_name, @_);
47 return $self->$level_name(@_);
50 sub _build_max_level {
52 return $self->level_names->[-1];
55 sub _build__level_active {
58 my $min_level = $self->min_level;
59 my $max_level = $self->max_level;
62 foreach my $level (@{$self->level_names}) {
63 if($level eq $min_level) {
67 $active{$level} = $should_log;
69 if (defined $max_level && $level eq $max_level) {
78 my ($self, $level, $content, $metadata_in) = @_;
79 my %metadata = %$metadata_in;
80 my $rendered = $self->_render($level, \%metadata, @$content);
81 $self->_output($rendered);
84 sub _create_format_lookup {
85 my ($self, $level, $metadata, $content) = @_;
86 my $method = $metadata->{method};
88 $method = '(none)' unless defined $method;
91 '%' => '%', 'n' => "\n",
92 t => $self->_render_time($metadata->{timestamp}),
93 r => $self->_render_remote($metadata->{object_remote}),
94 s => $self->_render_log(@$content), l => $level,
95 c => $metadata->{controller}, p => $metadata->{package}, m => $method,
96 f => $metadata->{filename}, i => $metadata->{line},
97 h => $metadata->{hostname}, P => $metadata->{pid},
101 sub _get_format_var_value {
102 my ($self, $name, $data) = @_;
103 my $val = $data->{$name};
104 return $val if defined $val;
105 return '(undefined)';
109 my ($self, $time) = @_;
110 return scalar(localtime($time));
114 my ($self, $remote) = @_;
115 return 'local' if ! defined $remote || ! defined $remote->{connection_id};
116 return 'remote #' . $remote->{connection_id};
120 my ($self, @content) = @_;
121 return join('', @content);
124 my ($self, $level, $metadata, @content) = @_;
125 my $var_table = $self->_create_format_lookup($level, $metadata, [@content]);
126 my $template = $self->format;
128 $template =~ s/%([\w%])/$self->_get_format_var_value($1, $var_table)/ge;
131 $template =~ s/\n/\n /g;
137 my ($self, $content) = @_;
138 print STDERR $content;
147 Object::Remote::Logging::Logger - Format and output a log message
151 use Object::Remote::Logging::Logger;
152 use Object::Remote::Logging qw( router arg_levels );
154 my $app_output = Object::Remote::Logging::Logger->new(
155 level_names => arg_levels, format => '%t %s',
156 min_level => 'verbose', max_level => 'info',
159 #Selector method can return 0 or more logger
160 #objects that will receive the messages
162 my ($generating_package, $metadata) = @_;
163 return unless $metadata->{controller} eq 'App::Logging::Subclass';
167 #true value as second argument causes the selector
168 #to be stored with a weak reference
169 router->connect($selector, 1);
171 #disconnect the selector from the router
174 #router will hold this logger forever
175 #and send it all log messages
176 router->connect(Object::Remote::Logging::WarnLogger->new(
177 level_names => arg_levels, format => '%s at %f line %i, log level: %l'
178 min_level => 'warn', max_level => 'error',
183 This class receives log messages from an instance of L<Object::Remote::Log::Router>,
184 formats them according to configuration, and then outputs them to STDERR. In between
185 the router and the logger is a selector method which inspects the log message metadata
186 and can return 0 or more loggers that should receive the log message.
190 A logger object receives the log messages that are generated and converts them to
191 formatted log entries then displays them to the end user. Each logger has a set
192 of active log levels and will only output a log entry if the log message is at
195 To gain access to the stream of log messages a connection is made to the log router.
196 A logger can directly connect to the router and receive an unfiltered stream of
197 log messages or a selector closure can be used instead. The selector will be executed
198 for each log message with the message metadata and returns a list of 0 or more loggers
199 that should receive the log message. When the selector is executed the first argument
200 is the class name of the package that generated the log message and the second argument
201 is a hash reference containing the message metadata.
205 The message metadata is a hash reference with the following keys:
211 Name of the log level of the message.
215 Name of the sub-class of Object::Remote::Logging in use by
216 the generating package.
220 Name of the package that generated the log message.
224 Name of the method the message was generated inside of.
228 Unix time of the message generation.
232 Process id of the Perl interpreter the message was generated in.
236 Hostname of the system where the message was generated.
240 Name of the file the message was generated in.
244 Line of the source file the message was generated at.
248 This is a reference to another hash that contains the Object::Remote
249 specific information. The keys are
255 If the log message was generated on a remote Perl interpreter then the
256 Object::Remote::Connection id of that interpreter will be available here.
268 This is a required attribute. Must be an array ref with the list of log level names
269 in it. The list must be ordered with the lowest level as element 0 and the highest
270 level as the last element. There is no default value.
274 The lowest log level that will be output by the logger. There is no default value.
278 The highest log level that will be output by the logger. The default value is the
279 highest level present in level_names.
283 The printf style format string to use when rendering the log message. The following
284 sequences are significant:
290 Level name that the log message was generated at.
294 Log message rendered into a string with a leading space before any additional lines in a
295 multiple line message.
299 Time the log message was generated rendered into a string. The time value is taken from
300 the Perl interpreter that generated the log message; it is not the time that the logger
301 received the log message on the local interpreter if the log message was forwarded.
305 Log::Remote connection information rendered into a string.
309 Name of the sub-class of Object::Remote::Logging that was used by the class
310 that generated the log message. Can also be Object::Remote::Logging itself.
314 Package name of the class that generated the log message.
318 Method name that generated the log message.
322 Filename that the log message was generated in.
326 Line number the log message was generated at.
330 Hostname the log message was generated on.
334 Process id of the Perl interpreter that generated the log message.