Commit | Line | Data |
0daa11f3 |
1 | package Log::Contextual; |
2 | |
a2777569 |
3 | use strict; |
4 | use warnings; |
2033c911 |
5 | |
a00f2691 |
6 | our $VERSION = '0.005000_02'; |
b42fe5d2 |
7 | $VERSION = eval $VERSION if $VERSION =~ /_/; # numify for warning-free dev releases |
2033c911 |
8 | |
ae9785e2 |
9 | my @levels = qw(debug trace warn info error fatal); |
10 | |
675503c7 |
11 | use Exporter::Declare; |
12 | use Exporter::Declare::Export::Generator; |
f11f9542 |
13 | use Data::Dumper::Concise; |
5b094c87 |
14 | use Scalar::Util 'blessed'; |
2033c911 |
15 | |
b144ba01 |
16 | eval { |
17 | require Log::Log4perl; |
18 | die if $Log::Log4perl::VERSION < 1.29; |
19 | Log::Log4perl->wrapper_register(__PACKAGE__) |
20 | }; |
21 | |
5fd26f45 |
22 | # ____ is because tags must have at least one export and we don't want to |
23 | # export anything but the levels selected |
6ae293d7 |
24 | sub ____ { } |
5fd26f45 |
25 | |
6ae293d7 |
26 | exports(qw(____ set_logger with_logger )); |
f11f9542 |
27 | |
5fd26f45 |
28 | export_tag dlog => ('____'); |
29 | export_tag log => ('____'); |
675503c7 |
30 | import_arguments qw(logger package_logger default_logger); |
31 | |
139ded54 |
32 | sub router { |
0092c26a |
33 | our $Router_Instance ||= do { |
34 | require Log::Contextual::Router; |
35 | Log::Contextual::Router->new |
6ae293d7 |
36 | } |
0092c26a |
37 | } |
38 | |
6ae293d7 |
39 | sub arg_logger { $_[1] } |
40 | sub arg_levels { $_[1] || [qw(debug trace warn info error fatal)] } |
8112b699 |
41 | sub arg_package_logger { $_[1] } |
42 | sub arg_default_logger { $_[1] } |
43 | |
675503c7 |
44 | sub before_import { |
45 | my ($class, $importer, $spec) = @_; |
6ae293d7 |
46 | my $router = $class->router; |
47 | my $exports = $spec->exports; |
48 | my %router_args = ( |
49 | exporter => $class, |
50 | target => $importer, |
51 | arguments => $spec->argument_info |
52 | ); |
f11f9542 |
53 | |
f11f9542 |
54 | die 'Log::Contextual does not have a default import list' |
6ae293d7 |
55 | if $spec->config->{default}; |
675503c7 |
56 | |
a5454e75 |
57 | $router->before_import(%router_args); |
8112b699 |
58 | |
84d7d9ee |
59 | if ($exports->{'&set_logger'}) { |
60 | die ref($router) . " does not support set_logger()" |
61 | unless $router->does('Log::Contextual::Role::Router::SetLogger'); |
4d605164 |
62 | |
84d7d9ee |
63 | $spec->add_export('&set_logger', sub { $router->set_logger(@_) }) |
64 | } |
4d605164 |
65 | |
84d7d9ee |
66 | if ($exports->{'&with_logger'}) { |
67 | die ref($router) . " does not support with_logger()" |
68 | unless $router->does('Log::Contextual::Role::Router::WithLogger'); |
4d605164 |
69 | |
84d7d9ee |
70 | $spec->add_export('&with_logger', sub { $router->with_logger(@_) }) |
71 | } |
4d605164 |
72 | |
5fd26f45 |
73 | my @levels = @{$class->arg_levels($spec->config->{levels})}; |
675503c7 |
74 | for my $level (@levels) { |
75 | if ($spec->config->{log}) { |
6ae293d7 |
76 | $spec->add_export( |
77 | "&log_$level", |
78 | sub (&@) { |
79 | my ($code, @args) = @_; |
80 | $router->handle_log_request( |
81 | exporter => $class, |
82 | caller_package => scalar(caller), |
83 | caller_level => 1, |
84 | message_level => $level, |
85 | message_sub => $code, |
86 | message_args => \@args, |
87 | ); |
88 | return @args; |
89 | }); |
90 | $spec->add_export( |
91 | "&logS_$level", |
92 | sub (&@) { |
93 | my ($code, @args) = @_; |
94 | $router->handle_log_request( |
95 | exporter => $class, |
96 | caller_package => scalar(caller), |
97 | caller_level => 1, |
98 | message_level => $level, |
99 | message_sub => $code, |
100 | message_args => \@args, |
101 | ); |
102 | return $args[0]; |
103 | }); |
675503c7 |
104 | } |
105 | if ($spec->config->{dlog}) { |
6ae293d7 |
106 | $spec->add_export( |
107 | "&Dlog_$level", |
108 | sub (&@) { |
109 | my ($code, @args) = @_; |
110 | my $wrapped = sub { |
111 | local $_ = (@_ ? Data::Dumper::Concise::Dumper @_ : '()'); |
112 | &$code; |
113 | }; |
114 | $router->handle_log_request( |
115 | exporter => $class, |
116 | caller_package => scalar(caller), |
117 | caller_level => 1, |
118 | message_level => $level, |
119 | message_sub => $wrapped, |
120 | message_args => \@args, |
121 | ); |
122 | return @args; |
123 | }); |
124 | $spec->add_export( |
125 | "&DlogS_$level", |
126 | sub (&$) { |
127 | my ($code, $ref) = @_; |
128 | my $wrapped = sub { |
129 | local $_ = Data::Dumper::Concise::Dumper($_[0]); |
130 | &$code; |
131 | }; |
132 | $router->handle_log_request( |
133 | exporter => $class, |
134 | caller_package => scalar(caller), |
135 | caller_level => 1, |
136 | message_level => $level, |
137 | message_sub => $wrapped, |
138 | message_args => [$ref], |
139 | ); |
140 | return $ref; |
141 | }); |
a2777569 |
142 | } |
143 | } |
675503c7 |
144 | } |
145 | |
a5454e75 |
146 | sub after_import { |
147 | my ($class, $importer, $spec) = @_; |
6ae293d7 |
148 | my %router_args = ( |
149 | exporter => $class, |
150 | target => $importer, |
151 | arguments => $spec->argument_info |
152 | ); |
a5454e75 |
153 | $class->router->after_import(%router_args); |
154 | } |
709d11fe |
155 | |
0daa11f3 |
156 | 1; |
0a3750e2 |
157 | |
158 | __END__ |
159 | |
2daff231 |
160 | =head1 NAME |
161 | |
8bc568d2 |
162 | Log::Contextual - Simple logging interface with a contextual log |
2daff231 |
163 | |
164 | =head1 SYNOPSIS |
165 | |
9b8e24d5 |
166 | use Log::Contextual qw( :log :dlog set_logger with_logger ); |
5b094c87 |
167 | use Log::Contextual::SimpleLogger; |
168 | use Log::Log4perl ':easy'; |
169 | Log::Log4perl->easy_init($DEBUG); |
2daff231 |
170 | |
5b094c87 |
171 | my $logger = Log::Log4perl->get_logger; |
172 | |
173 | set_logger $logger; |
2daff231 |
174 | |
9b8e24d5 |
175 | log_debug { 'program started' }; |
2daff231 |
176 | |
177 | sub foo { |
f9bf084b |
178 | |
179 | my $minilogger = Log::Contextual::SimpleLogger->new({ |
180 | levels => [qw( trace debug )] |
181 | }); |
182 | |
2ae9c121 |
183 | my @args = @_; |
184 | |
f9bf084b |
185 | with_logger $minilogger => sub { |
21431192 |
186 | log_trace { 'foo entered' }; |
2ae9c121 |
187 | my ($foo, $bar) = Dlog_trace { "params for foo: $_" } @args; |
2daff231 |
188 | # ... |
21431192 |
189 | log_trace { 'foo left' }; |
f9bf084b |
190 | }; |
2daff231 |
191 | } |
192 | |
5b094c87 |
193 | foo(); |
194 | |
9fe4eeb3 |
195 | Beginning with version 1.008 L<Log::Dispatchouli> also works out of the box |
196 | with C<Log::Contextual>: |
197 | |
198 | use Log::Contextual qw( :log :dlog set_logger ); |
199 | use Log::Dispatchouli; |
200 | my $ld = Log::Dispatchouli->new({ |
201 | ident => 'slrtbrfst', |
202 | to_stderr => 1, |
203 | debug => 1, |
204 | }); |
205 | |
206 | set_logger $ld; |
207 | |
208 | log_debug { 'program started' }; |
209 | |
2daff231 |
210 | =head1 DESCRIPTION |
211 | |
30d7027a |
212 | Major benefits: |
213 | |
214 | =over 2 |
215 | |
216 | =item * Efficient |
217 | |
218 | The logging functions take blocks, so if a log level is disabled, the |
219 | block will not run: |
220 | |
221 | # the following won't run if debug is off |
222 | log_debug { "the new count in the database is " . $rs->count }; |
223 | |
224 | Similarly, the C<D> prefixed methods only C<Dumper> the input if the level is |
225 | enabled. |
226 | |
227 | =item * Handy |
228 | |
229 | The logging functions return their arguments, so you can stick them in |
230 | the middle of expressions: |
231 | |
232 | for (log_debug { "downloading:\n" . join qq(\n), @_ } @urls) { ... } |
233 | |
234 | =item * Generic |
235 | |
236 | C<Log::Contextual> is an interface for all major loggers. If you log through |
237 | C<Log::Contextual> you will be able to swap underlying loggers later. |
238 | |
239 | =item * Powerful |
240 | |
39cd2f65 |
241 | C<Log::Contextual> chooses which logger to use based on L<< user defined C<CodeRef>s|/LOGGER CODEREF >>. |
30d7027a |
242 | Normally you don't need to know this, but you can take advantage of it when you |
243 | need to later |
244 | |
245 | =item * Scalable |
246 | |
247 | If you just want to add logging to your extremely basic application, start with |
248 | L<Log::Contextual::SimpleLogger> and then as your needs grow you can switch to |
249 | L<Log::Dispatchouli> or L<Log::Dispatch> or L<Log::Log4perl> or whatever else. |
250 | |
251 | =back |
252 | |
253 | This module is a simple interface to extensible logging. It exists to |
254 | abstract your logging interface so that logging is as painless as possible, |
255 | while still allowing you to switch from one logger to another. |
3dc9bd3c |
256 | |
30d7027a |
257 | It is bundled with a really basic logger, L<Log::Contextual::SimpleLogger>, |
258 | but in general you should use a real logger instead of that. For something |
259 | more serious but not overly complicated, try L<Log::Dispatchouli> (see |
260 | L</SYNOPSIS> for example.) |
a2af6976 |
261 | |
e36f2183 |
262 | =head1 A WORK IN PROGRESS |
263 | |
264 | This module is certainly not complete, but we will not break the interface |
265 | lightly, so I would say it's safe to use in production code. The main result |
266 | from that at this point is that doing: |
267 | |
268 | use Log::Contextual; |
269 | |
270 | will die as we do not yet know what the defaults should be. If it turns out |
271 | that nearly everyone uses the C<:log> tag and C<:dlog> is really rare, we'll |
272 | probably make C<:log> the default. But only time and usage will tell. |
273 | |
274 | =head1 IMPORT OPTIONS |
275 | |
276 | See L</SETTING DEFAULT IMPORT OPTIONS> for information on setting these project |
277 | wide. |
3dc9bd3c |
278 | |
c154d18a |
279 | =head2 -logger |
280 | |
3dc9bd3c |
281 | When you import this module you may use C<-logger> as a shortcut for |
282 | L<set_logger>, for example: |
283 | |
284 | use Log::Contextual::SimpleLogger; |
9b8e24d5 |
285 | use Log::Contextual qw( :dlog ), |
286 | -logger => Log::Contextual::SimpleLogger->new({ levels => [qw( debug )] }); |
3dc9bd3c |
287 | |
288 | sometimes you might want to have the logger handy for other stuff, in which |
289 | case you might try something like the following: |
290 | |
291 | my $var_log; |
292 | BEGIN { $var_log = VarLogger->new } |
9b8e24d5 |
293 | use Log::Contextual qw( :dlog ), -logger => $var_log; |
3dc9bd3c |
294 | |
5fd26f45 |
295 | =head2 -levels |
296 | |
297 | The C<-levels> import option allows you to define exactly which levels your |
298 | logger supports. So the default, |
299 | C<< [qw(debug trace warn info error fatal)] >>, works great for |
300 | L<Log::Log4perl>, but it doesn't support the levels for L<Log::Dispatch>. But |
301 | supporting those levels is as easy as doing |
302 | |
303 | use Log::Contextual |
304 | -levels => [qw( debug info notice warning error critical alert emergency )]; |
305 | |
e2b4b29c |
306 | =head2 -package_logger |
307 | |
308 | The C<-package_logger> import option is similar to the C<-logger> import option |
309 | except C<-package_logger> sets the the logger for the current package. |
310 | |
311 | Unlike L</-default_logger>, C<-package_logger> cannot be overridden with |
312 | L</set_logger>. |
313 | |
314 | package My::Package; |
315 | use Log::Contextual::SimpleLogger; |
316 | use Log::Contextual qw( :log ), |
317 | -package_logger => Log::Contextual::WarnLogger->new({ |
318 | env_prefix => 'MY_PACKAGE' |
319 | }); |
320 | |
321 | If you are interested in using this package for a module you are putting on |
322 | CPAN we recommend L<Log::Contextual::WarnLogger> for your package logger. |
323 | |
c154d18a |
324 | =head2 -default_logger |
325 | |
326 | The C<-default_logger> import option is similar to the C<-logger> import option |
e2b4b29c |
327 | except C<-default_logger> sets the the B<default> logger for the current package. |
c154d18a |
328 | |
329 | Basically it sets the logger to be used if C<set_logger> is never called; so |
330 | |
331 | package My::Package; |
332 | use Log::Contextual::SimpleLogger; |
333 | use Log::Contextual qw( :log ), |
334 | -default_logger => Log::Contextual::WarnLogger->new({ |
ae59bbe3 |
335 | env_prefix => 'MY_PACKAGE' |
c154d18a |
336 | }); |
337 | |
e36f2183 |
338 | =head1 SETTING DEFAULT IMPORT OPTIONS |
3dc9bd3c |
339 | |
e36f2183 |
340 | Eventually you will get tired of writing the following in every single one of |
341 | your packages: |
3dc9bd3c |
342 | |
e36f2183 |
343 | use Log::Log4perl; |
344 | use Log::Log4perl ':easy'; |
345 | BEGIN { Log::Log4perl->easy_init($DEBUG) } |
3dc9bd3c |
346 | |
e36f2183 |
347 | use Log::Contextual -logger => Log::Log4perl->get_logger; |
348 | |
349 | You can set any of the import options for your whole project if you define your |
350 | own C<Log::Contextual> subclass as follows: |
351 | |
352 | package MyApp::Log::Contextual; |
353 | |
354 | use base 'Log::Contextual'; |
355 | |
356 | use Log::Log4perl ':easy'; |
357 | Log::Log4perl->easy_init($DEBUG) |
358 | |
2b40dee5 |
359 | sub arg_default_logger { $_[1] || Log::Log4perl->get_logger } |
e36f2183 |
360 | sub arg_levels { [qw(debug trace warn info error fatal custom_level)] } |
361 | |
2b40dee5 |
362 | # or maybe instead of default_logger |
e36f2183 |
363 | sub arg_package_logger { $_[1] } |
e36f2183 |
364 | |
2b40dee5 |
365 | # and almost definitely not this, which is only here for completeness |
366 | sub arg_logger { $_[1] } |
e36f2183 |
367 | |
2b40dee5 |
368 | Note the C<< $_[1] || >> in C<arg_default_logger>. All of these methods are |
369 | passed the values passed in from the arguments to the subclass, so you can |
370 | either throw them away, honor them, die on usage, or whatever. To be clear, |
371 | if you define your subclass, and someone uses it as follows: |
e36f2183 |
372 | |
2b40dee5 |
373 | use MyApp::Log::Contextual -default_logger => $foo, |
374 | -levels => [qw(bar baz biff)]; |
375 | |
376 | Your C<arg_default_logger> method will get C<$foo> and your C<arg_levels> |
e36f2183 |
377 | will get C<[qw(bar baz biff)]>; |
2daff231 |
378 | |
379 | =head1 FUNCTIONS |
380 | |
381 | =head2 set_logger |
382 | |
383 | my $logger = WarnLogger->new; |
21431192 |
384 | set_logger $logger; |
385 | |
27141a7a |
386 | Arguments: L</LOGGER CODEREF> |
2daff231 |
387 | |
21431192 |
388 | C<set_logger> will just set the current logger to whatever you pass it. It |
389 | expects a C<CodeRef>, but if you pass it something else it will wrap it in a |
06e908c3 |
390 | C<CodeRef> for you. C<set_logger> is really meant only to be called from a |
391 | top-level script. To avoid foot-shooting the function will warn if you call it |
392 | more than once. |
2daff231 |
393 | |
394 | =head2 with_logger |
395 | |
396 | my $logger = WarnLogger->new; |
21431192 |
397 | with_logger $logger => sub { |
2daff231 |
398 | if (1 == 0) { |
399 | log_fatal { 'Non Logical Universe Detected' }; |
400 | } else { |
401 | log_info { 'All is good' }; |
402 | } |
80c3e48b |
403 | }; |
2daff231 |
404 | |
27141a7a |
405 | Arguments: L</LOGGER CODEREF>, C<CodeRef $to_execute> |
2daff231 |
406 | |
21431192 |
407 | C<with_logger> sets the logger for the scope of the C<CodeRef> C<$to_execute>. |
0e13e261 |
408 | As with L</set_logger>, C<with_logger> will wrap C<$returning_logger> with a |
21431192 |
409 | C<CodeRef> if needed. |
2daff231 |
410 | |
21431192 |
411 | =head2 log_$level |
2daff231 |
412 | |
0e13e261 |
413 | Import Tag: C<:log> |
3dc9bd3c |
414 | |
0e13e261 |
415 | Arguments: C<CodeRef $returning_message, @args> |
2daff231 |
416 | |
a4d67519 |
417 | C<log_$level> functions all work the same except that a different method |
21431192 |
418 | is called on the underlying C<$logger> object. The basic pattern is: |
2daff231 |
419 | |
0e13e261 |
420 | sub log_$level (&@) { |
21431192 |
421 | if ($logger->is_$level) { |
0e13e261 |
422 | $logger->$level(shift->(@_)); |
21431192 |
423 | } |
0e13e261 |
424 | @_ |
21431192 |
425 | } |
2daff231 |
426 | |
0e13e261 |
427 | Note that the function returns it's arguments. This can be used in a number of |
428 | ways, but often it's convenient just for partial inspection of passthrough data |
429 | |
430 | my @friends = log_trace { |
431 | 'friends list being generated, data from first friend: ' . |
432 | Dumper($_[0]->TO_JSON) |
433 | } generate_friend_list(); |
434 | |
435 | If you want complete inspection of passthrough data, take a look at the |
436 | L</Dlog_$level> functions. |
437 | |
a4d67519 |
438 | Which functions are exported depends on what was passed to L</-levels>. The |
439 | default (no C<-levels> option passed) would export: |
2daff231 |
440 | |
a4d67519 |
441 | =over 2 |
2daff231 |
442 | |
a4d67519 |
443 | =item log_trace |
2daff231 |
444 | |
a4d67519 |
445 | =item log_debug |
2daff231 |
446 | |
a4d67519 |
447 | =item log_info |
2daff231 |
448 | |
a4d67519 |
449 | =item log_warn |
2daff231 |
450 | |
a4d67519 |
451 | =item log_error |
2daff231 |
452 | |
a4d67519 |
453 | =item log_fatal |
2daff231 |
454 | |
a4d67519 |
455 | =back |
2daff231 |
456 | |
0e13e261 |
457 | =head2 logS_$level |
458 | |
459 | Import Tag: C<:log> |
460 | |
461 | Arguments: C<CodeRef $returning_message, Item $arg> |
462 | |
463 | This is really just a special case of the L</log_$level> functions. It forces |
464 | scalar context when that is what you need. Other than that it works exactly |
465 | same: |
466 | |
467 | my $friend = logS_trace { |
468 | 'I only have one friend: ' . Dumper($_[0]->TO_JSON) |
469 | } friend(); |
470 | |
471 | See also: L</DlogS_$level>. |
472 | |
21431192 |
473 | =head2 Dlog_$level |
474 | |
0e13e261 |
475 | Import Tag: C<:dlog> |
3dc9bd3c |
476 | |
0e13e261 |
477 | Arguments: C<CodeRef $returning_message, @args> |
2daff231 |
478 | |
0e13e261 |
479 | All of the following six functions work the same as their L</log_$level> |
9b8e24d5 |
480 | brethren, except they return what is passed into them and put the stringified |
21431192 |
481 | (with L<Data::Dumper::Concise>) version of their args into C<$_>. This means |
482 | you can do cool things like the following: |
483 | |
484 | my @nicks = Dlog_debug { "names: $_" } map $_->value, $frew->names->all; |
485 | |
486 | and the output might look something like: |
487 | |
488 | names: "fREW" |
489 | "fRIOUX" |
490 | "fROOH" |
491 | "fRUE" |
492 | "fiSMBoC" |
493 | |
a4d67519 |
494 | Which functions are exported depends on what was passed to L</-levels>. The |
495 | default (no C<-levels> option passed) would export: |
21431192 |
496 | |
a4d67519 |
497 | =over 2 |
21431192 |
498 | |
a4d67519 |
499 | =item Dlog_trace |
21431192 |
500 | |
a4d67519 |
501 | =item Dlog_debug |
21431192 |
502 | |
a4d67519 |
503 | =item Dlog_info |
21431192 |
504 | |
a4d67519 |
505 | =item Dlog_warn |
21431192 |
506 | |
a4d67519 |
507 | =item Dlog_error |
2daff231 |
508 | |
a4d67519 |
509 | =item Dlog_fatal |
2daff231 |
510 | |
a4d67519 |
511 | =back |
2daff231 |
512 | |
83b33eb5 |
513 | =head2 DlogS_$level |
514 | |
0e13e261 |
515 | Import Tag: C<:dlog> |
3dc9bd3c |
516 | |
0e13e261 |
517 | Arguments: C<CodeRef $returning_message, Item $arg> |
83b33eb5 |
518 | |
0e13e261 |
519 | Like L</logS_$level>, these functions are a special case of L</Dlog_$level>. |
520 | They only take a single scalar after the C<$returning_message> instead of |
521 | slurping up (and also setting C<wantarray>) all the C<@args> |
83b33eb5 |
522 | |
523 | my $pals_rs = DlogS_debug { "pals resultset: $_" } |
524 | $schema->resultset('Pals')->search({ perlers => 1 }); |
525 | |
27141a7a |
526 | =head1 LOGGER CODEREF |
527 | |
528 | Anywhere a logger object can be passed, a coderef is accepted. This is so |
529 | that the user can use different logger objects based on runtime information. |
530 | The logger coderef is passed the package of the caller the caller level the |
531 | coderef needs to use if it wants more caller information. The latter is in |
532 | a hashref to allow for more options in the future. |
533 | |
37a8266a |
534 | Here is a basic example of a logger that exploits C<caller> to reproduce the |
535 | output of C<warn> with a logger: |
536 | |
537 | my @caller_info; |
538 | my $var_log = Log::Contextual::SimpleLogger->new({ |
539 | levels => [qw(trace debug info warn error fatal)], |
540 | coderef => sub { chomp($_[0]); warn "$_[0] at $caller_info[1] line $caller_info[2].\n" } |
541 | }); |
542 | my $warn_faker = sub { |
543 | my ($package, $args) = @_; |
544 | @caller_info = caller($args->{caller_level}); |
545 | $var_log |
546 | }; |
547 | set_logger($warn_faker); |
548 | log_debug { 'test' }; |
549 | |
27141a7a |
550 | The following is an example that uses the information passed to the logger |
551 | coderef. It sets the global logger to C<$l3>, the logger for the C<A1> |
552 | package to C<$l1>, except the C<lol> method in C<A1> which uses the C<$l2> |
553 | logger and lastly the logger for the C<A2> package to C<$l2>. |
554 | |
37a8266a |
555 | Note that it increases the caller level as it dispatches based on where |
556 | the caller of the log function, not the log function itself. |
557 | |
27141a7a |
558 | my $complex_dispatcher = do { |
559 | |
560 | my $l1 = ...; |
561 | my $l2 = ...; |
562 | my $l3 = ...; |
563 | |
564 | my %registry = ( |
565 | -logger => $l3, |
566 | A1 => { |
567 | -logger => $l1, |
568 | lol => $l2, |
569 | }, |
570 | A2 => { -logger => $l2 }, |
571 | ); |
572 | |
573 | sub { |
574 | my ( $package, $info ) = @_; |
575 | |
576 | my $logger = $registry{'-logger'}; |
577 | if (my $r = $registry{$package}) { |
578 | $logger = $r->{'-logger'} if $r->{'-logger'}; |
37a8266a |
579 | my (undef, undef, undef, $sub) = caller($info->{caller_level} + 1); |
27141a7a |
580 | $sub =~ s/^\Q$package\E:://g; |
581 | $logger = $r->{$sub} if $r->{$sub}; |
582 | } |
583 | return $logger; |
584 | } |
585 | }; |
586 | |
587 | set_logger $complex_dispatcher; |
588 | |
3dc9bd3c |
589 | =head1 LOGGER INTERFACE |
590 | |
591 | Because this module is ultimately pretty looking glue (glittery?) with the |
592 | awesome benefit of the Contextual part, users will often want to make their |
593 | favorite logger work with it. The following are the methods that should be |
594 | implemented in the logger: |
595 | |
596 | is_trace |
597 | is_debug |
598 | is_info |
599 | is_warn |
600 | is_error |
601 | is_fatal |
602 | trace |
603 | debug |
604 | info |
605 | warn |
606 | error |
607 | fatal |
608 | |
609 | The first six merely need to return true if that level is enabled. The latter |
610 | six take the results of whatever the user returned from their coderef and log |
611 | them. For a basic example see L<Log::Contextual::SimpleLogger>. |
612 | |
eab2ca3c |
613 | =head1 LOG ROUTING |
614 | |
a5454e75 |
615 | In between the loggers and the log functions is a log router that is responsible for |
eab2ca3c |
616 | finding a logger to handle the log event and passing the log information to the |
a5454e75 |
617 | logger. This relationship is described in the documentation for C<Log::Contextual::Role::Router>. |
eab2ca3c |
618 | |
a5454e75 |
619 | C<Log::Contextual> and packages that extend it will by default share a router singleton that |
620 | implements the with_logger() and set_logger() functions and also respects the -logger, |
621 | -package_logger, and -default_logger import options with their associated default value |
622 | functions. The router singleton is available as the return value of the router() function. Users |
623 | of Log::Contextual may overload router() to return instances of custom log routers that |
624 | could for example work with loggers that use a different interface. |
eab2ca3c |
625 | |
a5454e75 |
626 | =head1 AUTHOR |
2daff231 |
627 | |
628 | frew - Arthur Axel "fREW" Schmidt <frioux@gmail.com> |
629 | |
a5454e75 |
630 | =head1 CONTRIBUTORS |
631 | |
eab2ca3c |
632 | triddle - Tyler Riddle <t.riddle@shadowcat.co.uk> |
633 | |
2daff231 |
634 | =head1 DESIGNER |
635 | |
636 | mst - Matt S. Trout <mst@shadowcat.co.uk> |
637 | |
638 | =head1 COPYRIGHT |
639 | |
a6e29e27 |
640 | Copyright (c) 2012 the Log::Contextual L</AUTHOR> and L</DESIGNER> as listed |
2daff231 |
641 | above. |
642 | |
643 | =head1 LICENSE |
644 | |
645 | This library is free software and may be distributed under the same terms as |
646 | Perl 5 itself. |
647 | |
648 | =cut |
649 | |