Commit | Line | Data |
0daa11f3 |
1 | package Log::Contextual; |
2 | |
a2777569 |
3 | use strict; |
4 | use warnings; |
2033c911 |
5 | |
0c180ced |
6 | our $VERSION = '0.004202'; |
2033c911 |
7 | |
ae9785e2 |
8 | my @levels = qw(debug trace warn info error fatal); |
9 | |
675503c7 |
10 | use Exporter::Declare; |
11 | use Exporter::Declare::Export::Generator; |
f11f9542 |
12 | use Data::Dumper::Concise; |
5b094c87 |
13 | use Scalar::Util 'blessed'; |
2033c911 |
14 | |
b144ba01 |
15 | eval { |
16 | require Log::Log4perl; |
17 | die if $Log::Log4perl::VERSION < 1.29; |
18 | Log::Log4perl->wrapper_register(__PACKAGE__) |
19 | }; |
20 | |
5fd26f45 |
21 | # ____ is because tags must have at least one export and we don't want to |
22 | # export anything but the levels selected |
6ae293d7 |
23 | sub ____ { } |
5fd26f45 |
24 | |
6ae293d7 |
25 | exports(qw(____ set_logger with_logger )); |
f11f9542 |
26 | |
5fd26f45 |
27 | export_tag dlog => ('____'); |
28 | export_tag log => ('____'); |
675503c7 |
29 | import_arguments qw(logger package_logger default_logger); |
30 | |
139ded54 |
31 | sub router { |
0092c26a |
32 | our $Router_Instance ||= do { |
33 | require Log::Contextual::Router; |
34 | Log::Contextual::Router->new |
6ae293d7 |
35 | } |
0092c26a |
36 | } |
37 | |
6ae293d7 |
38 | sub arg_logger { $_[1] } |
39 | sub arg_levels { $_[1] || [qw(debug trace warn info error fatal)] } |
8112b699 |
40 | sub arg_package_logger { $_[1] } |
41 | sub arg_default_logger { $_[1] } |
42 | |
675503c7 |
43 | sub before_import { |
44 | my ($class, $importer, $spec) = @_; |
6ae293d7 |
45 | my $router = $class->router; |
46 | my $exports = $spec->exports; |
47 | my %router_args = ( |
48 | exporter => $class, |
49 | target => $importer, |
50 | arguments => $spec->argument_info |
51 | ); |
f11f9542 |
52 | |
f11f9542 |
53 | die 'Log::Contextual does not have a default import list' |
6ae293d7 |
54 | if $spec->config->{default}; |
675503c7 |
55 | |
a5454e75 |
56 | $router->before_import(%router_args); |
8112b699 |
57 | |
6ae293d7 |
58 | $spec->add_export( |
59 | '&set_logger', |
60 | sub { |
61 | my $router = $class->router; |
4d605164 |
62 | |
6ae293d7 |
63 | die ref($router) . " does not support set_logger()" |
64 | unless $router->does('Log::Contextual::Role::Router::SetLogger'); |
4d605164 |
65 | |
6ae293d7 |
66 | return $router->set_logger(@_); |
67 | }) if $exports->{'&set_logger'}; |
4d605164 |
68 | |
6ae293d7 |
69 | $spec->add_export( |
70 | '&with_logger', |
71 | sub { |
72 | my $router = $class->router; |
4d605164 |
73 | |
6ae293d7 |
74 | die ref($router) . " does not support with_logger()" |
75 | unless $router->does('Log::Contextual::Role::Router::WithLogger'); |
4d605164 |
76 | |
6ae293d7 |
77 | return $router->with_logger(@_); |
78 | }) if $exports->{'&with_logger'}; |
4d605164 |
79 | |
5fd26f45 |
80 | my @levels = @{$class->arg_levels($spec->config->{levels})}; |
675503c7 |
81 | for my $level (@levels) { |
82 | if ($spec->config->{log}) { |
6ae293d7 |
83 | $spec->add_export( |
84 | "&log_$level", |
85 | sub (&@) { |
86 | my ($code, @args) = @_; |
87 | $router->handle_log_request( |
88 | exporter => $class, |
89 | caller_package => scalar(caller), |
90 | caller_level => 1, |
91 | message_level => $level, |
92 | message_sub => $code, |
93 | message_args => \@args, |
94 | ); |
95 | return @args; |
96 | }); |
97 | $spec->add_export( |
98 | "&logS_$level", |
99 | sub (&@) { |
100 | my ($code, @args) = @_; |
101 | $router->handle_log_request( |
102 | exporter => $class, |
103 | caller_package => scalar(caller), |
104 | caller_level => 1, |
105 | message_level => $level, |
106 | message_sub => $code, |
107 | message_args => \@args, |
108 | ); |
109 | return $args[0]; |
110 | }); |
675503c7 |
111 | } |
112 | if ($spec->config->{dlog}) { |
6ae293d7 |
113 | $spec->add_export( |
114 | "&Dlog_$level", |
115 | sub (&@) { |
116 | my ($code, @args) = @_; |
117 | my $wrapped = sub { |
118 | local $_ = (@_ ? Data::Dumper::Concise::Dumper @_ : '()'); |
119 | &$code; |
120 | }; |
121 | $router->handle_log_request( |
122 | exporter => $class, |
123 | caller_package => scalar(caller), |
124 | caller_level => 1, |
125 | message_level => $level, |
126 | message_sub => $wrapped, |
127 | message_args => \@args, |
128 | ); |
129 | return @args; |
130 | }); |
131 | $spec->add_export( |
132 | "&DlogS_$level", |
133 | sub (&$) { |
134 | my ($code, $ref) = @_; |
135 | my $wrapped = sub { |
136 | local $_ = Data::Dumper::Concise::Dumper($_[0]); |
137 | &$code; |
138 | }; |
139 | $router->handle_log_request( |
140 | exporter => $class, |
141 | caller_package => scalar(caller), |
142 | caller_level => 1, |
143 | message_level => $level, |
144 | message_sub => $wrapped, |
145 | message_args => [$ref], |
146 | ); |
147 | return $ref; |
148 | }); |
a2777569 |
149 | } |
150 | } |
675503c7 |
151 | } |
152 | |
a5454e75 |
153 | sub after_import { |
154 | my ($class, $importer, $spec) = @_; |
6ae293d7 |
155 | my %router_args = ( |
156 | exporter => $class, |
157 | target => $importer, |
158 | arguments => $spec->argument_info |
159 | ); |
a5454e75 |
160 | $class->router->after_import(%router_args); |
161 | } |
709d11fe |
162 | |
0daa11f3 |
163 | 1; |
0a3750e2 |
164 | |
165 | __END__ |
166 | |
2daff231 |
167 | =head1 NAME |
168 | |
8bc568d2 |
169 | Log::Contextual - Simple logging interface with a contextual log |
2daff231 |
170 | |
171 | =head1 SYNOPSIS |
172 | |
9b8e24d5 |
173 | use Log::Contextual qw( :log :dlog set_logger with_logger ); |
5b094c87 |
174 | use Log::Contextual::SimpleLogger; |
175 | use Log::Log4perl ':easy'; |
176 | Log::Log4perl->easy_init($DEBUG); |
2daff231 |
177 | |
5b094c87 |
178 | my $logger = Log::Log4perl->get_logger; |
179 | |
180 | set_logger $logger; |
2daff231 |
181 | |
9b8e24d5 |
182 | log_debug { 'program started' }; |
2daff231 |
183 | |
184 | sub foo { |
f9bf084b |
185 | |
186 | my $minilogger = Log::Contextual::SimpleLogger->new({ |
187 | levels => [qw( trace debug )] |
188 | }); |
189 | |
190 | with_logger $minilogger => sub { |
21431192 |
191 | log_trace { 'foo entered' }; |
9b8e24d5 |
192 | my ($foo, $bar) = Dlog_trace { "params for foo: $_" } @_; |
2daff231 |
193 | # ... |
21431192 |
194 | log_trace { 'foo left' }; |
f9bf084b |
195 | }; |
2daff231 |
196 | } |
197 | |
5b094c87 |
198 | foo(); |
199 | |
9fe4eeb3 |
200 | Beginning with version 1.008 L<Log::Dispatchouli> also works out of the box |
201 | with C<Log::Contextual>: |
202 | |
203 | use Log::Contextual qw( :log :dlog set_logger ); |
204 | use Log::Dispatchouli; |
205 | my $ld = Log::Dispatchouli->new({ |
206 | ident => 'slrtbrfst', |
207 | to_stderr => 1, |
208 | debug => 1, |
209 | }); |
210 | |
211 | set_logger $ld; |
212 | |
213 | log_debug { 'program started' }; |
214 | |
2daff231 |
215 | =head1 DESCRIPTION |
216 | |
30d7027a |
217 | Major benefits: |
218 | |
219 | =over 2 |
220 | |
221 | =item * Efficient |
222 | |
223 | The logging functions take blocks, so if a log level is disabled, the |
224 | block will not run: |
225 | |
226 | # the following won't run if debug is off |
227 | log_debug { "the new count in the database is " . $rs->count }; |
228 | |
229 | Similarly, the C<D> prefixed methods only C<Dumper> the input if the level is |
230 | enabled. |
231 | |
232 | =item * Handy |
233 | |
234 | The logging functions return their arguments, so you can stick them in |
235 | the middle of expressions: |
236 | |
237 | for (log_debug { "downloading:\n" . join qq(\n), @_ } @urls) { ... } |
238 | |
239 | =item * Generic |
240 | |
241 | C<Log::Contextual> is an interface for all major loggers. If you log through |
242 | C<Log::Contextual> you will be able to swap underlying loggers later. |
243 | |
244 | =item * Powerful |
245 | |
39cd2f65 |
246 | C<Log::Contextual> chooses which logger to use based on L<< user defined C<CodeRef>s|/LOGGER CODEREF >>. |
30d7027a |
247 | Normally you don't need to know this, but you can take advantage of it when you |
248 | need to later |
249 | |
250 | =item * Scalable |
251 | |
252 | If you just want to add logging to your extremely basic application, start with |
253 | L<Log::Contextual::SimpleLogger> and then as your needs grow you can switch to |
254 | L<Log::Dispatchouli> or L<Log::Dispatch> or L<Log::Log4perl> or whatever else. |
255 | |
256 | =back |
257 | |
258 | This module is a simple interface to extensible logging. It exists to |
259 | abstract your logging interface so that logging is as painless as possible, |
260 | while still allowing you to switch from one logger to another. |
3dc9bd3c |
261 | |
30d7027a |
262 | It is bundled with a really basic logger, L<Log::Contextual::SimpleLogger>, |
263 | but in general you should use a real logger instead of that. For something |
264 | more serious but not overly complicated, try L<Log::Dispatchouli> (see |
265 | L</SYNOPSIS> for example.) |
a2af6976 |
266 | |
e36f2183 |
267 | =head1 A WORK IN PROGRESS |
268 | |
269 | This module is certainly not complete, but we will not break the interface |
270 | lightly, so I would say it's safe to use in production code. The main result |
271 | from that at this point is that doing: |
272 | |
273 | use Log::Contextual; |
274 | |
275 | will die as we do not yet know what the defaults should be. If it turns out |
276 | that nearly everyone uses the C<:log> tag and C<:dlog> is really rare, we'll |
277 | probably make C<:log> the default. But only time and usage will tell. |
278 | |
279 | =head1 IMPORT OPTIONS |
280 | |
281 | See L</SETTING DEFAULT IMPORT OPTIONS> for information on setting these project |
282 | wide. |
3dc9bd3c |
283 | |
c154d18a |
284 | =head2 -logger |
285 | |
3dc9bd3c |
286 | When you import this module you may use C<-logger> as a shortcut for |
287 | L<set_logger>, for example: |
288 | |
289 | use Log::Contextual::SimpleLogger; |
9b8e24d5 |
290 | use Log::Contextual qw( :dlog ), |
291 | -logger => Log::Contextual::SimpleLogger->new({ levels => [qw( debug )] }); |
3dc9bd3c |
292 | |
293 | sometimes you might want to have the logger handy for other stuff, in which |
294 | case you might try something like the following: |
295 | |
296 | my $var_log; |
297 | BEGIN { $var_log = VarLogger->new } |
9b8e24d5 |
298 | use Log::Contextual qw( :dlog ), -logger => $var_log; |
3dc9bd3c |
299 | |
5fd26f45 |
300 | =head2 -levels |
301 | |
302 | The C<-levels> import option allows you to define exactly which levels your |
303 | logger supports. So the default, |
304 | C<< [qw(debug trace warn info error fatal)] >>, works great for |
305 | L<Log::Log4perl>, but it doesn't support the levels for L<Log::Dispatch>. But |
306 | supporting those levels is as easy as doing |
307 | |
308 | use Log::Contextual |
309 | -levels => [qw( debug info notice warning error critical alert emergency )]; |
310 | |
e2b4b29c |
311 | =head2 -package_logger |
312 | |
313 | The C<-package_logger> import option is similar to the C<-logger> import option |
314 | except C<-package_logger> sets the the logger for the current package. |
315 | |
316 | Unlike L</-default_logger>, C<-package_logger> cannot be overridden with |
317 | L</set_logger>. |
318 | |
319 | package My::Package; |
320 | use Log::Contextual::SimpleLogger; |
321 | use Log::Contextual qw( :log ), |
322 | -package_logger => Log::Contextual::WarnLogger->new({ |
323 | env_prefix => 'MY_PACKAGE' |
324 | }); |
325 | |
326 | If you are interested in using this package for a module you are putting on |
327 | CPAN we recommend L<Log::Contextual::WarnLogger> for your package logger. |
328 | |
c154d18a |
329 | =head2 -default_logger |
330 | |
331 | The C<-default_logger> import option is similar to the C<-logger> import option |
e2b4b29c |
332 | except C<-default_logger> sets the the B<default> logger for the current package. |
c154d18a |
333 | |
334 | Basically it sets the logger to be used if C<set_logger> is never called; so |
335 | |
336 | package My::Package; |
337 | use Log::Contextual::SimpleLogger; |
338 | use Log::Contextual qw( :log ), |
339 | -default_logger => Log::Contextual::WarnLogger->new({ |
ae59bbe3 |
340 | env_prefix => 'MY_PACKAGE' |
c154d18a |
341 | }); |
342 | |
e36f2183 |
343 | =head1 SETTING DEFAULT IMPORT OPTIONS |
3dc9bd3c |
344 | |
e36f2183 |
345 | Eventually you will get tired of writing the following in every single one of |
346 | your packages: |
3dc9bd3c |
347 | |
e36f2183 |
348 | use Log::Log4perl; |
349 | use Log::Log4perl ':easy'; |
350 | BEGIN { Log::Log4perl->easy_init($DEBUG) } |
3dc9bd3c |
351 | |
e36f2183 |
352 | use Log::Contextual -logger => Log::Log4perl->get_logger; |
353 | |
354 | You can set any of the import options for your whole project if you define your |
355 | own C<Log::Contextual> subclass as follows: |
356 | |
357 | package MyApp::Log::Contextual; |
358 | |
359 | use base 'Log::Contextual'; |
360 | |
361 | use Log::Log4perl ':easy'; |
362 | Log::Log4perl->easy_init($DEBUG) |
363 | |
2b40dee5 |
364 | sub arg_default_logger { $_[1] || Log::Log4perl->get_logger } |
e36f2183 |
365 | sub arg_levels { [qw(debug trace warn info error fatal custom_level)] } |
366 | |
2b40dee5 |
367 | # or maybe instead of default_logger |
e36f2183 |
368 | sub arg_package_logger { $_[1] } |
e36f2183 |
369 | |
2b40dee5 |
370 | # and almost definitely not this, which is only here for completeness |
371 | sub arg_logger { $_[1] } |
e36f2183 |
372 | |
2b40dee5 |
373 | Note the C<< $_[1] || >> in C<arg_default_logger>. All of these methods are |
374 | passed the values passed in from the arguments to the subclass, so you can |
375 | either throw them away, honor them, die on usage, or whatever. To be clear, |
376 | if you define your subclass, and someone uses it as follows: |
e36f2183 |
377 | |
2b40dee5 |
378 | use MyApp::Log::Contextual -default_logger => $foo, |
379 | -levels => [qw(bar baz biff)]; |
380 | |
381 | Your C<arg_default_logger> method will get C<$foo> and your C<arg_levels> |
e36f2183 |
382 | will get C<[qw(bar baz biff)]>; |
2daff231 |
383 | |
384 | =head1 FUNCTIONS |
385 | |
386 | =head2 set_logger |
387 | |
388 | my $logger = WarnLogger->new; |
21431192 |
389 | set_logger $logger; |
390 | |
27141a7a |
391 | Arguments: L</LOGGER CODEREF> |
2daff231 |
392 | |
21431192 |
393 | C<set_logger> will just set the current logger to whatever you pass it. It |
394 | expects a C<CodeRef>, but if you pass it something else it will wrap it in a |
06e908c3 |
395 | C<CodeRef> for you. C<set_logger> is really meant only to be called from a |
396 | top-level script. To avoid foot-shooting the function will warn if you call it |
397 | more than once. |
2daff231 |
398 | |
399 | =head2 with_logger |
400 | |
401 | my $logger = WarnLogger->new; |
21431192 |
402 | with_logger $logger => sub { |
2daff231 |
403 | if (1 == 0) { |
404 | log_fatal { 'Non Logical Universe Detected' }; |
405 | } else { |
406 | log_info { 'All is good' }; |
407 | } |
80c3e48b |
408 | }; |
2daff231 |
409 | |
27141a7a |
410 | Arguments: L</LOGGER CODEREF>, C<CodeRef $to_execute> |
2daff231 |
411 | |
21431192 |
412 | C<with_logger> sets the logger for the scope of the C<CodeRef> C<$to_execute>. |
0e13e261 |
413 | As with L</set_logger>, C<with_logger> will wrap C<$returning_logger> with a |
21431192 |
414 | C<CodeRef> if needed. |
2daff231 |
415 | |
21431192 |
416 | =head2 log_$level |
2daff231 |
417 | |
0e13e261 |
418 | Import Tag: C<:log> |
3dc9bd3c |
419 | |
0e13e261 |
420 | Arguments: C<CodeRef $returning_message, @args> |
2daff231 |
421 | |
a4d67519 |
422 | C<log_$level> functions all work the same except that a different method |
21431192 |
423 | is called on the underlying C<$logger> object. The basic pattern is: |
2daff231 |
424 | |
0e13e261 |
425 | sub log_$level (&@) { |
21431192 |
426 | if ($logger->is_$level) { |
0e13e261 |
427 | $logger->$level(shift->(@_)); |
21431192 |
428 | } |
0e13e261 |
429 | @_ |
21431192 |
430 | } |
2daff231 |
431 | |
0e13e261 |
432 | Note that the function returns it's arguments. This can be used in a number of |
433 | ways, but often it's convenient just for partial inspection of passthrough data |
434 | |
435 | my @friends = log_trace { |
436 | 'friends list being generated, data from first friend: ' . |
437 | Dumper($_[0]->TO_JSON) |
438 | } generate_friend_list(); |
439 | |
440 | If you want complete inspection of passthrough data, take a look at the |
441 | L</Dlog_$level> functions. |
442 | |
a4d67519 |
443 | Which functions are exported depends on what was passed to L</-levels>. The |
444 | default (no C<-levels> option passed) would export: |
2daff231 |
445 | |
a4d67519 |
446 | =over 2 |
2daff231 |
447 | |
a4d67519 |
448 | =item log_trace |
2daff231 |
449 | |
a4d67519 |
450 | =item log_debug |
2daff231 |
451 | |
a4d67519 |
452 | =item log_info |
2daff231 |
453 | |
a4d67519 |
454 | =item log_warn |
2daff231 |
455 | |
a4d67519 |
456 | =item log_error |
2daff231 |
457 | |
a4d67519 |
458 | =item log_fatal |
2daff231 |
459 | |
a4d67519 |
460 | =back |
2daff231 |
461 | |
0e13e261 |
462 | =head2 logS_$level |
463 | |
464 | Import Tag: C<:log> |
465 | |
466 | Arguments: C<CodeRef $returning_message, Item $arg> |
467 | |
468 | This is really just a special case of the L</log_$level> functions. It forces |
469 | scalar context when that is what you need. Other than that it works exactly |
470 | same: |
471 | |
472 | my $friend = logS_trace { |
473 | 'I only have one friend: ' . Dumper($_[0]->TO_JSON) |
474 | } friend(); |
475 | |
476 | See also: L</DlogS_$level>. |
477 | |
21431192 |
478 | =head2 Dlog_$level |
479 | |
0e13e261 |
480 | Import Tag: C<:dlog> |
3dc9bd3c |
481 | |
0e13e261 |
482 | Arguments: C<CodeRef $returning_message, @args> |
2daff231 |
483 | |
0e13e261 |
484 | All of the following six functions work the same as their L</log_$level> |
9b8e24d5 |
485 | brethren, except they return what is passed into them and put the stringified |
21431192 |
486 | (with L<Data::Dumper::Concise>) version of their args into C<$_>. This means |
487 | you can do cool things like the following: |
488 | |
489 | my @nicks = Dlog_debug { "names: $_" } map $_->value, $frew->names->all; |
490 | |
491 | and the output might look something like: |
492 | |
493 | names: "fREW" |
494 | "fRIOUX" |
495 | "fROOH" |
496 | "fRUE" |
497 | "fiSMBoC" |
498 | |
a4d67519 |
499 | Which functions are exported depends on what was passed to L</-levels>. The |
500 | default (no C<-levels> option passed) would export: |
21431192 |
501 | |
a4d67519 |
502 | =over 2 |
21431192 |
503 | |
a4d67519 |
504 | =item Dlog_trace |
21431192 |
505 | |
a4d67519 |
506 | =item Dlog_debug |
21431192 |
507 | |
a4d67519 |
508 | =item Dlog_info |
21431192 |
509 | |
a4d67519 |
510 | =item Dlog_warn |
21431192 |
511 | |
a4d67519 |
512 | =item Dlog_error |
2daff231 |
513 | |
a4d67519 |
514 | =item Dlog_fatal |
2daff231 |
515 | |
a4d67519 |
516 | =back |
2daff231 |
517 | |
83b33eb5 |
518 | =head2 DlogS_$level |
519 | |
0e13e261 |
520 | Import Tag: C<:dlog> |
3dc9bd3c |
521 | |
0e13e261 |
522 | Arguments: C<CodeRef $returning_message, Item $arg> |
83b33eb5 |
523 | |
0e13e261 |
524 | Like L</logS_$level>, these functions are a special case of L</Dlog_$level>. |
525 | They only take a single scalar after the C<$returning_message> instead of |
526 | slurping up (and also setting C<wantarray>) all the C<@args> |
83b33eb5 |
527 | |
528 | my $pals_rs = DlogS_debug { "pals resultset: $_" } |
529 | $schema->resultset('Pals')->search({ perlers => 1 }); |
530 | |
27141a7a |
531 | =head1 LOGGER CODEREF |
532 | |
533 | Anywhere a logger object can be passed, a coderef is accepted. This is so |
534 | that the user can use different logger objects based on runtime information. |
535 | The logger coderef is passed the package of the caller the caller level the |
536 | coderef needs to use if it wants more caller information. The latter is in |
537 | a hashref to allow for more options in the future. |
538 | |
37a8266a |
539 | Here is a basic example of a logger that exploits C<caller> to reproduce the |
540 | output of C<warn> with a logger: |
541 | |
542 | my @caller_info; |
543 | my $var_log = Log::Contextual::SimpleLogger->new({ |
544 | levels => [qw(trace debug info warn error fatal)], |
545 | coderef => sub { chomp($_[0]); warn "$_[0] at $caller_info[1] line $caller_info[2].\n" } |
546 | }); |
547 | my $warn_faker = sub { |
548 | my ($package, $args) = @_; |
549 | @caller_info = caller($args->{caller_level}); |
550 | $var_log |
551 | }; |
552 | set_logger($warn_faker); |
553 | log_debug { 'test' }; |
554 | |
27141a7a |
555 | The following is an example that uses the information passed to the logger |
556 | coderef. It sets the global logger to C<$l3>, the logger for the C<A1> |
557 | package to C<$l1>, except the C<lol> method in C<A1> which uses the C<$l2> |
558 | logger and lastly the logger for the C<A2> package to C<$l2>. |
559 | |
37a8266a |
560 | Note that it increases the caller level as it dispatches based on where |
561 | the caller of the log function, not the log function itself. |
562 | |
27141a7a |
563 | my $complex_dispatcher = do { |
564 | |
565 | my $l1 = ...; |
566 | my $l2 = ...; |
567 | my $l3 = ...; |
568 | |
569 | my %registry = ( |
570 | -logger => $l3, |
571 | A1 => { |
572 | -logger => $l1, |
573 | lol => $l2, |
574 | }, |
575 | A2 => { -logger => $l2 }, |
576 | ); |
577 | |
578 | sub { |
579 | my ( $package, $info ) = @_; |
580 | |
581 | my $logger = $registry{'-logger'}; |
582 | if (my $r = $registry{$package}) { |
583 | $logger = $r->{'-logger'} if $r->{'-logger'}; |
37a8266a |
584 | my (undef, undef, undef, $sub) = caller($info->{caller_level} + 1); |
27141a7a |
585 | $sub =~ s/^\Q$package\E:://g; |
586 | $logger = $r->{$sub} if $r->{$sub}; |
587 | } |
588 | return $logger; |
589 | } |
590 | }; |
591 | |
592 | set_logger $complex_dispatcher; |
593 | |
3dc9bd3c |
594 | =head1 LOGGER INTERFACE |
595 | |
596 | Because this module is ultimately pretty looking glue (glittery?) with the |
597 | awesome benefit of the Contextual part, users will often want to make their |
598 | favorite logger work with it. The following are the methods that should be |
599 | implemented in the logger: |
600 | |
601 | is_trace |
602 | is_debug |
603 | is_info |
604 | is_warn |
605 | is_error |
606 | is_fatal |
607 | trace |
608 | debug |
609 | info |
610 | warn |
611 | error |
612 | fatal |
613 | |
614 | The first six merely need to return true if that level is enabled. The latter |
615 | six take the results of whatever the user returned from their coderef and log |
616 | them. For a basic example see L<Log::Contextual::SimpleLogger>. |
617 | |
eab2ca3c |
618 | =head1 LOG ROUTING |
619 | |
a5454e75 |
620 | In between the loggers and the log functions is a log router that is responsible for |
eab2ca3c |
621 | finding a logger to handle the log event and passing the log information to the |
a5454e75 |
622 | logger. This relationship is described in the documentation for C<Log::Contextual::Role::Router>. |
eab2ca3c |
623 | |
a5454e75 |
624 | C<Log::Contextual> and packages that extend it will by default share a router singleton that |
625 | implements the with_logger() and set_logger() functions and also respects the -logger, |
626 | -package_logger, and -default_logger import options with their associated default value |
627 | functions. The router singleton is available as the return value of the router() function. Users |
628 | of Log::Contextual may overload router() to return instances of custom log routers that |
629 | could for example work with loggers that use a different interface. |
eab2ca3c |
630 | |
a5454e75 |
631 | =head1 AUTHOR |
2daff231 |
632 | |
633 | frew - Arthur Axel "fREW" Schmidt <frioux@gmail.com> |
634 | |
a5454e75 |
635 | =head1 CONTRIBUTORS |
636 | |
eab2ca3c |
637 | triddle - Tyler Riddle <t.riddle@shadowcat.co.uk> |
638 | |
2daff231 |
639 | =head1 DESIGNER |
640 | |
641 | mst - Matt S. Trout <mst@shadowcat.co.uk> |
642 | |
643 | =head1 COPYRIGHT |
644 | |
a6e29e27 |
645 | Copyright (c) 2012 the Log::Contextual L</AUTHOR> and L</DESIGNER> as listed |
2daff231 |
646 | above. |
647 | |
648 | =head1 LICENSE |
649 | |
650 | This library is free software and may be distributed under the same terms as |
651 | Perl 5 itself. |
652 | |
653 | =cut |
654 | |