Commit | Line | Data |
0daa11f3 |
1 | package Log::Contextual; |
2 | |
a2777569 |
3 | use strict; |
4 | use warnings; |
2033c911 |
5 | |
8ccaf9fb |
6 | our $VERSION = '0.005001'; |
b42fe5d2 |
7 | $VERSION = eval $VERSION if $VERSION =~ /_/; # numify for warning-free dev releases |
2033c911 |
8 | |
ae9785e2 |
9 | my @levels = qw(debug trace warn info error fatal); |
10 | |
675503c7 |
11 | use Exporter::Declare; |
12 | use Exporter::Declare::Export::Generator; |
f11f9542 |
13 | use Data::Dumper::Concise; |
5b094c87 |
14 | use Scalar::Util 'blessed'; |
2033c911 |
15 | |
e0e3c3d0 |
16 | my @dlog = ((map "Dlog_$_", @levels), (map "DlogS_$_", @levels)); |
17 | |
18 | my @log = ((map "log_$_", @levels), (map "logS_$_", @levels)); |
19 | |
b144ba01 |
20 | eval { |
21 | require Log::Log4perl; |
22 | die if $Log::Log4perl::VERSION < 1.29; |
23 | Log::Log4perl->wrapper_register(__PACKAGE__) |
24 | }; |
25 | |
5fd26f45 |
26 | # ____ is because tags must have at least one export and we don't want to |
27 | # export anything but the levels selected |
6ae293d7 |
28 | sub ____ { } |
5fd26f45 |
29 | |
e0e3c3d0 |
30 | exports ('____', |
31 | @dlog, @log, |
32 | qw( set_logger with_logger ) |
33 | ); |
f11f9542 |
34 | |
5fd26f45 |
35 | export_tag dlog => ('____'); |
36 | export_tag log => ('____'); |
675503c7 |
37 | import_arguments qw(logger package_logger default_logger); |
38 | |
139ded54 |
39 | sub router { |
0092c26a |
40 | our $Router_Instance ||= do { |
41 | require Log::Contextual::Router; |
42 | Log::Contextual::Router->new |
6ae293d7 |
43 | } |
0092c26a |
44 | } |
45 | |
e06303cd |
46 | sub default_import { |
47 | my ($class) = shift; |
48 | |
49 | die 'Log::Contextual does not have a default import list'; |
50 | |
51 | () |
52 | } |
53 | |
6ae293d7 |
54 | sub arg_logger { $_[1] } |
55 | sub arg_levels { $_[1] || [qw(debug trace warn info error fatal)] } |
8112b699 |
56 | sub arg_package_logger { $_[1] } |
57 | sub arg_default_logger { $_[1] } |
58 | |
675503c7 |
59 | sub before_import { |
60 | my ($class, $importer, $spec) = @_; |
6ae293d7 |
61 | my $router = $class->router; |
62 | my $exports = $spec->exports; |
63 | my %router_args = ( |
64 | exporter => $class, |
65 | target => $importer, |
66 | arguments => $spec->argument_info |
67 | ); |
f11f9542 |
68 | |
e06303cd |
69 | my @tags = $class->default_import($spec) |
6ae293d7 |
70 | if $spec->config->{default}; |
675503c7 |
71 | |
e06303cd |
72 | for (@tags) { |
73 | die "only tags are supported for defaults at this time" |
74 | unless $_ =~ /^:(.*)$/; |
75 | |
76 | $spec->config->{$1} = 1; |
77 | } |
78 | |
a5454e75 |
79 | $router->before_import(%router_args); |
8112b699 |
80 | |
84d7d9ee |
81 | if ($exports->{'&set_logger'}) { |
82 | die ref($router) . " does not support set_logger()" |
83 | unless $router->does('Log::Contextual::Role::Router::SetLogger'); |
4d605164 |
84 | |
84d7d9ee |
85 | $spec->add_export('&set_logger', sub { $router->set_logger(@_) }) |
86 | } |
4d605164 |
87 | |
84d7d9ee |
88 | if ($exports->{'&with_logger'}) { |
89 | die ref($router) . " does not support with_logger()" |
90 | unless $router->does('Log::Contextual::Role::Router::WithLogger'); |
4d605164 |
91 | |
84d7d9ee |
92 | $spec->add_export('&with_logger', sub { $router->with_logger(@_) }) |
93 | } |
4d605164 |
94 | |
5fd26f45 |
95 | my @levels = @{$class->arg_levels($spec->config->{levels})}; |
675503c7 |
96 | for my $level (@levels) { |
97 | if ($spec->config->{log}) { |
6ae293d7 |
98 | $spec->add_export( |
99 | "&log_$level", |
100 | sub (&@) { |
101 | my ($code, @args) = @_; |
102 | $router->handle_log_request( |
103 | exporter => $class, |
104 | caller_package => scalar(caller), |
105 | caller_level => 1, |
106 | message_level => $level, |
107 | message_sub => $code, |
108 | message_args => \@args, |
109 | ); |
110 | return @args; |
111 | }); |
112 | $spec->add_export( |
113 | "&logS_$level", |
114 | sub (&@) { |
115 | my ($code, @args) = @_; |
116 | $router->handle_log_request( |
117 | exporter => $class, |
118 | caller_package => scalar(caller), |
119 | caller_level => 1, |
120 | message_level => $level, |
121 | message_sub => $code, |
122 | message_args => \@args, |
123 | ); |
124 | return $args[0]; |
125 | }); |
675503c7 |
126 | } |
127 | if ($spec->config->{dlog}) { |
6ae293d7 |
128 | $spec->add_export( |
129 | "&Dlog_$level", |
130 | sub (&@) { |
131 | my ($code, @args) = @_; |
132 | my $wrapped = sub { |
133 | local $_ = (@_ ? Data::Dumper::Concise::Dumper @_ : '()'); |
134 | &$code; |
135 | }; |
136 | $router->handle_log_request( |
137 | exporter => $class, |
138 | caller_package => scalar(caller), |
139 | caller_level => 1, |
140 | message_level => $level, |
141 | message_sub => $wrapped, |
142 | message_args => \@args, |
143 | ); |
144 | return @args; |
145 | }); |
146 | $spec->add_export( |
147 | "&DlogS_$level", |
148 | sub (&$) { |
149 | my ($code, $ref) = @_; |
150 | my $wrapped = sub { |
151 | local $_ = Data::Dumper::Concise::Dumper($_[0]); |
152 | &$code; |
153 | }; |
154 | $router->handle_log_request( |
155 | exporter => $class, |
156 | caller_package => scalar(caller), |
157 | caller_level => 1, |
158 | message_level => $level, |
159 | message_sub => $wrapped, |
160 | message_args => [$ref], |
161 | ); |
162 | return $ref; |
163 | }); |
a2777569 |
164 | } |
165 | } |
675503c7 |
166 | } |
167 | |
a5454e75 |
168 | sub after_import { |
169 | my ($class, $importer, $spec) = @_; |
6ae293d7 |
170 | my %router_args = ( |
171 | exporter => $class, |
172 | target => $importer, |
173 | arguments => $spec->argument_info |
174 | ); |
a5454e75 |
175 | $class->router->after_import(%router_args); |
176 | } |
709d11fe |
177 | |
0daa11f3 |
178 | 1; |
0a3750e2 |
179 | |
180 | __END__ |
181 | |
2daff231 |
182 | =head1 NAME |
183 | |
8bc568d2 |
184 | Log::Contextual - Simple logging interface with a contextual log |
2daff231 |
185 | |
186 | =head1 SYNOPSIS |
187 | |
9b8e24d5 |
188 | use Log::Contextual qw( :log :dlog set_logger with_logger ); |
5b094c87 |
189 | use Log::Contextual::SimpleLogger; |
190 | use Log::Log4perl ':easy'; |
191 | Log::Log4perl->easy_init($DEBUG); |
2daff231 |
192 | |
5b094c87 |
193 | my $logger = Log::Log4perl->get_logger; |
194 | |
195 | set_logger $logger; |
2daff231 |
196 | |
9b8e24d5 |
197 | log_debug { 'program started' }; |
2daff231 |
198 | |
199 | sub foo { |
f9bf084b |
200 | |
201 | my $minilogger = Log::Contextual::SimpleLogger->new({ |
202 | levels => [qw( trace debug )] |
203 | }); |
204 | |
2ae9c121 |
205 | my @args = @_; |
206 | |
f9bf084b |
207 | with_logger $minilogger => sub { |
21431192 |
208 | log_trace { 'foo entered' }; |
2ae9c121 |
209 | my ($foo, $bar) = Dlog_trace { "params for foo: $_" } @args; |
2daff231 |
210 | # ... |
21431192 |
211 | log_trace { 'foo left' }; |
f9bf084b |
212 | }; |
2daff231 |
213 | } |
214 | |
5b094c87 |
215 | foo(); |
216 | |
9fe4eeb3 |
217 | Beginning with version 1.008 L<Log::Dispatchouli> also works out of the box |
218 | with C<Log::Contextual>: |
219 | |
220 | use Log::Contextual qw( :log :dlog set_logger ); |
221 | use Log::Dispatchouli; |
222 | my $ld = Log::Dispatchouli->new({ |
223 | ident => 'slrtbrfst', |
224 | to_stderr => 1, |
225 | debug => 1, |
226 | }); |
227 | |
228 | set_logger $ld; |
229 | |
230 | log_debug { 'program started' }; |
231 | |
2daff231 |
232 | =head1 DESCRIPTION |
233 | |
30d7027a |
234 | Major benefits: |
235 | |
236 | =over 2 |
237 | |
238 | =item * Efficient |
239 | |
240 | The logging functions take blocks, so if a log level is disabled, the |
241 | block will not run: |
242 | |
243 | # the following won't run if debug is off |
244 | log_debug { "the new count in the database is " . $rs->count }; |
245 | |
246 | Similarly, the C<D> prefixed methods only C<Dumper> the input if the level is |
247 | enabled. |
248 | |
249 | =item * Handy |
250 | |
251 | The logging functions return their arguments, so you can stick them in |
252 | the middle of expressions: |
253 | |
254 | for (log_debug { "downloading:\n" . join qq(\n), @_ } @urls) { ... } |
255 | |
256 | =item * Generic |
257 | |
258 | C<Log::Contextual> is an interface for all major loggers. If you log through |
259 | C<Log::Contextual> you will be able to swap underlying loggers later. |
260 | |
261 | =item * Powerful |
262 | |
39cd2f65 |
263 | C<Log::Contextual> chooses which logger to use based on L<< user defined C<CodeRef>s|/LOGGER CODEREF >>. |
30d7027a |
264 | Normally you don't need to know this, but you can take advantage of it when you |
265 | need to later |
266 | |
267 | =item * Scalable |
268 | |
269 | If you just want to add logging to your extremely basic application, start with |
270 | L<Log::Contextual::SimpleLogger> and then as your needs grow you can switch to |
271 | L<Log::Dispatchouli> or L<Log::Dispatch> or L<Log::Log4perl> or whatever else. |
272 | |
273 | =back |
274 | |
275 | This module is a simple interface to extensible logging. It exists to |
276 | abstract your logging interface so that logging is as painless as possible, |
277 | while still allowing you to switch from one logger to another. |
3dc9bd3c |
278 | |
30d7027a |
279 | It is bundled with a really basic logger, L<Log::Contextual::SimpleLogger>, |
280 | but in general you should use a real logger instead of that. For something |
281 | more serious but not overly complicated, try L<Log::Dispatchouli> (see |
282 | L</SYNOPSIS> for example.) |
a2af6976 |
283 | |
e36f2183 |
284 | =head1 A WORK IN PROGRESS |
285 | |
286 | This module is certainly not complete, but we will not break the interface |
287 | lightly, so I would say it's safe to use in production code. The main result |
288 | from that at this point is that doing: |
289 | |
290 | use Log::Contextual; |
291 | |
292 | will die as we do not yet know what the defaults should be. If it turns out |
293 | that nearly everyone uses the C<:log> tag and C<:dlog> is really rare, we'll |
294 | probably make C<:log> the default. But only time and usage will tell. |
295 | |
296 | =head1 IMPORT OPTIONS |
297 | |
298 | See L</SETTING DEFAULT IMPORT OPTIONS> for information on setting these project |
299 | wide. |
3dc9bd3c |
300 | |
c154d18a |
301 | =head2 -logger |
302 | |
3dc9bd3c |
303 | When you import this module you may use C<-logger> as a shortcut for |
304 | L<set_logger>, for example: |
305 | |
306 | use Log::Contextual::SimpleLogger; |
9b8e24d5 |
307 | use Log::Contextual qw( :dlog ), |
308 | -logger => Log::Contextual::SimpleLogger->new({ levels => [qw( debug )] }); |
3dc9bd3c |
309 | |
310 | sometimes you might want to have the logger handy for other stuff, in which |
311 | case you might try something like the following: |
312 | |
313 | my $var_log; |
314 | BEGIN { $var_log = VarLogger->new } |
9b8e24d5 |
315 | use Log::Contextual qw( :dlog ), -logger => $var_log; |
3dc9bd3c |
316 | |
5fd26f45 |
317 | =head2 -levels |
318 | |
319 | The C<-levels> import option allows you to define exactly which levels your |
320 | logger supports. So the default, |
321 | C<< [qw(debug trace warn info error fatal)] >>, works great for |
322 | L<Log::Log4perl>, but it doesn't support the levels for L<Log::Dispatch>. But |
323 | supporting those levels is as easy as doing |
324 | |
325 | use Log::Contextual |
326 | -levels => [qw( debug info notice warning error critical alert emergency )]; |
327 | |
e2b4b29c |
328 | =head2 -package_logger |
329 | |
330 | The C<-package_logger> import option is similar to the C<-logger> import option |
331 | except C<-package_logger> sets the the logger for the current package. |
332 | |
333 | Unlike L</-default_logger>, C<-package_logger> cannot be overridden with |
334 | L</set_logger>. |
335 | |
336 | package My::Package; |
337 | use Log::Contextual::SimpleLogger; |
338 | use Log::Contextual qw( :log ), |
339 | -package_logger => Log::Contextual::WarnLogger->new({ |
340 | env_prefix => 'MY_PACKAGE' |
341 | }); |
342 | |
343 | If you are interested in using this package for a module you are putting on |
344 | CPAN we recommend L<Log::Contextual::WarnLogger> for your package logger. |
345 | |
c154d18a |
346 | =head2 -default_logger |
347 | |
348 | The C<-default_logger> import option is similar to the C<-logger> import option |
e2b4b29c |
349 | except C<-default_logger> sets the the B<default> logger for the current package. |
c154d18a |
350 | |
351 | Basically it sets the logger to be used if C<set_logger> is never called; so |
352 | |
353 | package My::Package; |
354 | use Log::Contextual::SimpleLogger; |
355 | use Log::Contextual qw( :log ), |
356 | -default_logger => Log::Contextual::WarnLogger->new({ |
ae59bbe3 |
357 | env_prefix => 'MY_PACKAGE' |
c154d18a |
358 | }); |
359 | |
e36f2183 |
360 | =head1 SETTING DEFAULT IMPORT OPTIONS |
3dc9bd3c |
361 | |
e36f2183 |
362 | Eventually you will get tired of writing the following in every single one of |
363 | your packages: |
3dc9bd3c |
364 | |
e36f2183 |
365 | use Log::Log4perl; |
366 | use Log::Log4perl ':easy'; |
367 | BEGIN { Log::Log4perl->easy_init($DEBUG) } |
3dc9bd3c |
368 | |
e36f2183 |
369 | use Log::Contextual -logger => Log::Log4perl->get_logger; |
370 | |
371 | You can set any of the import options for your whole project if you define your |
372 | own C<Log::Contextual> subclass as follows: |
373 | |
374 | package MyApp::Log::Contextual; |
375 | |
376 | use base 'Log::Contextual'; |
377 | |
378 | use Log::Log4perl ':easy'; |
379 | Log::Log4perl->easy_init($DEBUG) |
380 | |
2b40dee5 |
381 | sub arg_default_logger { $_[1] || Log::Log4perl->get_logger } |
e36f2183 |
382 | sub arg_levels { [qw(debug trace warn info error fatal custom_level)] } |
e06303cd |
383 | sub default_import { ':log' } |
e36f2183 |
384 | |
2b40dee5 |
385 | # or maybe instead of default_logger |
e36f2183 |
386 | sub arg_package_logger { $_[1] } |
e36f2183 |
387 | |
2b40dee5 |
388 | # and almost definitely not this, which is only here for completeness |
389 | sub arg_logger { $_[1] } |
e36f2183 |
390 | |
2b40dee5 |
391 | Note the C<< $_[1] || >> in C<arg_default_logger>. All of these methods are |
392 | passed the values passed in from the arguments to the subclass, so you can |
393 | either throw them away, honor them, die on usage, or whatever. To be clear, |
394 | if you define your subclass, and someone uses it as follows: |
e36f2183 |
395 | |
2b40dee5 |
396 | use MyApp::Log::Contextual -default_logger => $foo, |
397 | -levels => [qw(bar baz biff)]; |
398 | |
399 | Your C<arg_default_logger> method will get C<$foo> and your C<arg_levels> |
e36f2183 |
400 | will get C<[qw(bar baz biff)]>; |
2daff231 |
401 | |
e06303cd |
402 | Additionally, the C<default_import> method is what happens if a user tries to |
403 | use your subclass with no arguments. The default just dies, but if you'd like |
404 | to change the default to import a tag merely return the tags you'd like to |
405 | import. So the following will all work: |
406 | |
407 | sub default_import { ':log' } |
408 | |
409 | sub default_import { ':dlog' } |
410 | |
411 | sub default_import { qw(:dlog :log ) } |
412 | |
2daff231 |
413 | =head1 FUNCTIONS |
414 | |
415 | =head2 set_logger |
416 | |
417 | my $logger = WarnLogger->new; |
21431192 |
418 | set_logger $logger; |
419 | |
27141a7a |
420 | Arguments: L</LOGGER CODEREF> |
2daff231 |
421 | |
21431192 |
422 | C<set_logger> will just set the current logger to whatever you pass it. It |
423 | expects a C<CodeRef>, but if you pass it something else it will wrap it in a |
06e908c3 |
424 | C<CodeRef> for you. C<set_logger> is really meant only to be called from a |
425 | top-level script. To avoid foot-shooting the function will warn if you call it |
426 | more than once. |
2daff231 |
427 | |
428 | =head2 with_logger |
429 | |
430 | my $logger = WarnLogger->new; |
21431192 |
431 | with_logger $logger => sub { |
2daff231 |
432 | if (1 == 0) { |
433 | log_fatal { 'Non Logical Universe Detected' }; |
434 | } else { |
435 | log_info { 'All is good' }; |
436 | } |
80c3e48b |
437 | }; |
2daff231 |
438 | |
27141a7a |
439 | Arguments: L</LOGGER CODEREF>, C<CodeRef $to_execute> |
2daff231 |
440 | |
21431192 |
441 | C<with_logger> sets the logger for the scope of the C<CodeRef> C<$to_execute>. |
0e13e261 |
442 | As with L</set_logger>, C<with_logger> will wrap C<$returning_logger> with a |
21431192 |
443 | C<CodeRef> if needed. |
2daff231 |
444 | |
21431192 |
445 | =head2 log_$level |
2daff231 |
446 | |
0e13e261 |
447 | Import Tag: C<:log> |
3dc9bd3c |
448 | |
0e13e261 |
449 | Arguments: C<CodeRef $returning_message, @args> |
2daff231 |
450 | |
a4d67519 |
451 | C<log_$level> functions all work the same except that a different method |
21431192 |
452 | is called on the underlying C<$logger> object. The basic pattern is: |
2daff231 |
453 | |
0e13e261 |
454 | sub log_$level (&@) { |
21431192 |
455 | if ($logger->is_$level) { |
0e13e261 |
456 | $logger->$level(shift->(@_)); |
21431192 |
457 | } |
0e13e261 |
458 | @_ |
21431192 |
459 | } |
2daff231 |
460 | |
0e13e261 |
461 | Note that the function returns it's arguments. This can be used in a number of |
462 | ways, but often it's convenient just for partial inspection of passthrough data |
463 | |
464 | my @friends = log_trace { |
465 | 'friends list being generated, data from first friend: ' . |
466 | Dumper($_[0]->TO_JSON) |
467 | } generate_friend_list(); |
468 | |
469 | If you want complete inspection of passthrough data, take a look at the |
470 | L</Dlog_$level> functions. |
471 | |
a4d67519 |
472 | Which functions are exported depends on what was passed to L</-levels>. The |
473 | default (no C<-levels> option passed) would export: |
2daff231 |
474 | |
a4d67519 |
475 | =over 2 |
2daff231 |
476 | |
a4d67519 |
477 | =item log_trace |
2daff231 |
478 | |
a4d67519 |
479 | =item log_debug |
2daff231 |
480 | |
a4d67519 |
481 | =item log_info |
2daff231 |
482 | |
a4d67519 |
483 | =item log_warn |
2daff231 |
484 | |
a4d67519 |
485 | =item log_error |
2daff231 |
486 | |
a4d67519 |
487 | =item log_fatal |
2daff231 |
488 | |
a4d67519 |
489 | =back |
2daff231 |
490 | |
0e13e261 |
491 | =head2 logS_$level |
492 | |
493 | Import Tag: C<:log> |
494 | |
495 | Arguments: C<CodeRef $returning_message, Item $arg> |
496 | |
497 | This is really just a special case of the L</log_$level> functions. It forces |
498 | scalar context when that is what you need. Other than that it works exactly |
499 | same: |
500 | |
501 | my $friend = logS_trace { |
502 | 'I only have one friend: ' . Dumper($_[0]->TO_JSON) |
503 | } friend(); |
504 | |
505 | See also: L</DlogS_$level>. |
506 | |
21431192 |
507 | =head2 Dlog_$level |
508 | |
0e13e261 |
509 | Import Tag: C<:dlog> |
3dc9bd3c |
510 | |
0e13e261 |
511 | Arguments: C<CodeRef $returning_message, @args> |
2daff231 |
512 | |
0e13e261 |
513 | All of the following six functions work the same as their L</log_$level> |
9b8e24d5 |
514 | brethren, except they return what is passed into them and put the stringified |
21431192 |
515 | (with L<Data::Dumper::Concise>) version of their args into C<$_>. This means |
516 | you can do cool things like the following: |
517 | |
518 | my @nicks = Dlog_debug { "names: $_" } map $_->value, $frew->names->all; |
519 | |
520 | and the output might look something like: |
521 | |
522 | names: "fREW" |
523 | "fRIOUX" |
524 | "fROOH" |
525 | "fRUE" |
526 | "fiSMBoC" |
527 | |
a4d67519 |
528 | Which functions are exported depends on what was passed to L</-levels>. The |
529 | default (no C<-levels> option passed) would export: |
21431192 |
530 | |
a4d67519 |
531 | =over 2 |
21431192 |
532 | |
a4d67519 |
533 | =item Dlog_trace |
21431192 |
534 | |
a4d67519 |
535 | =item Dlog_debug |
21431192 |
536 | |
a4d67519 |
537 | =item Dlog_info |
21431192 |
538 | |
a4d67519 |
539 | =item Dlog_warn |
21431192 |
540 | |
a4d67519 |
541 | =item Dlog_error |
2daff231 |
542 | |
a4d67519 |
543 | =item Dlog_fatal |
2daff231 |
544 | |
a4d67519 |
545 | =back |
2daff231 |
546 | |
83b33eb5 |
547 | =head2 DlogS_$level |
548 | |
0e13e261 |
549 | Import Tag: C<:dlog> |
3dc9bd3c |
550 | |
0e13e261 |
551 | Arguments: C<CodeRef $returning_message, Item $arg> |
83b33eb5 |
552 | |
0e13e261 |
553 | Like L</logS_$level>, these functions are a special case of L</Dlog_$level>. |
554 | They only take a single scalar after the C<$returning_message> instead of |
555 | slurping up (and also setting C<wantarray>) all the C<@args> |
83b33eb5 |
556 | |
557 | my $pals_rs = DlogS_debug { "pals resultset: $_" } |
558 | $schema->resultset('Pals')->search({ perlers => 1 }); |
559 | |
27141a7a |
560 | =head1 LOGGER CODEREF |
561 | |
562 | Anywhere a logger object can be passed, a coderef is accepted. This is so |
563 | that the user can use different logger objects based on runtime information. |
564 | The logger coderef is passed the package of the caller the caller level the |
565 | coderef needs to use if it wants more caller information. The latter is in |
566 | a hashref to allow for more options in the future. |
567 | |
37a8266a |
568 | Here is a basic example of a logger that exploits C<caller> to reproduce the |
569 | output of C<warn> with a logger: |
570 | |
571 | my @caller_info; |
572 | my $var_log = Log::Contextual::SimpleLogger->new({ |
573 | levels => [qw(trace debug info warn error fatal)], |
574 | coderef => sub { chomp($_[0]); warn "$_[0] at $caller_info[1] line $caller_info[2].\n" } |
575 | }); |
576 | my $warn_faker = sub { |
577 | my ($package, $args) = @_; |
578 | @caller_info = caller($args->{caller_level}); |
579 | $var_log |
580 | }; |
581 | set_logger($warn_faker); |
582 | log_debug { 'test' }; |
583 | |
27141a7a |
584 | The following is an example that uses the information passed to the logger |
585 | coderef. It sets the global logger to C<$l3>, the logger for the C<A1> |
586 | package to C<$l1>, except the C<lol> method in C<A1> which uses the C<$l2> |
587 | logger and lastly the logger for the C<A2> package to C<$l2>. |
588 | |
37a8266a |
589 | Note that it increases the caller level as it dispatches based on where |
590 | the caller of the log function, not the log function itself. |
591 | |
27141a7a |
592 | my $complex_dispatcher = do { |
593 | |
594 | my $l1 = ...; |
595 | my $l2 = ...; |
596 | my $l3 = ...; |
597 | |
598 | my %registry = ( |
599 | -logger => $l3, |
600 | A1 => { |
601 | -logger => $l1, |
602 | lol => $l2, |
603 | }, |
604 | A2 => { -logger => $l2 }, |
605 | ); |
606 | |
607 | sub { |
608 | my ( $package, $info ) = @_; |
609 | |
610 | my $logger = $registry{'-logger'}; |
611 | if (my $r = $registry{$package}) { |
612 | $logger = $r->{'-logger'} if $r->{'-logger'}; |
37a8266a |
613 | my (undef, undef, undef, $sub) = caller($info->{caller_level} + 1); |
27141a7a |
614 | $sub =~ s/^\Q$package\E:://g; |
615 | $logger = $r->{$sub} if $r->{$sub}; |
616 | } |
617 | return $logger; |
618 | } |
619 | }; |
620 | |
621 | set_logger $complex_dispatcher; |
622 | |
3dc9bd3c |
623 | =head1 LOGGER INTERFACE |
624 | |
625 | Because this module is ultimately pretty looking glue (glittery?) with the |
626 | awesome benefit of the Contextual part, users will often want to make their |
627 | favorite logger work with it. The following are the methods that should be |
628 | implemented in the logger: |
629 | |
630 | is_trace |
631 | is_debug |
632 | is_info |
633 | is_warn |
634 | is_error |
635 | is_fatal |
636 | trace |
637 | debug |
638 | info |
639 | warn |
640 | error |
641 | fatal |
642 | |
643 | The first six merely need to return true if that level is enabled. The latter |
644 | six take the results of whatever the user returned from their coderef and log |
645 | them. For a basic example see L<Log::Contextual::SimpleLogger>. |
646 | |
eab2ca3c |
647 | =head1 LOG ROUTING |
648 | |
a5454e75 |
649 | In between the loggers and the log functions is a log router that is responsible for |
eab2ca3c |
650 | finding a logger to handle the log event and passing the log information to the |
a5454e75 |
651 | logger. This relationship is described in the documentation for C<Log::Contextual::Role::Router>. |
eab2ca3c |
652 | |
a5454e75 |
653 | C<Log::Contextual> and packages that extend it will by default share a router singleton that |
654 | implements the with_logger() and set_logger() functions and also respects the -logger, |
655 | -package_logger, and -default_logger import options with their associated default value |
656 | functions. The router singleton is available as the return value of the router() function. Users |
657 | of Log::Contextual may overload router() to return instances of custom log routers that |
658 | could for example work with loggers that use a different interface. |
eab2ca3c |
659 | |
a5454e75 |
660 | =head1 AUTHOR |
2daff231 |
661 | |
662 | frew - Arthur Axel "fREW" Schmidt <frioux@gmail.com> |
663 | |
a5454e75 |
664 | =head1 CONTRIBUTORS |
665 | |
eab2ca3c |
666 | triddle - Tyler Riddle <t.riddle@shadowcat.co.uk> |
667 | |
2daff231 |
668 | =head1 DESIGNER |
669 | |
670 | mst - Matt S. Trout <mst@shadowcat.co.uk> |
671 | |
672 | =head1 COPYRIGHT |
673 | |
a6e29e27 |
674 | Copyright (c) 2012 the Log::Contextual L</AUTHOR> and L</DESIGNER> as listed |
2daff231 |
675 | above. |
676 | |
677 | =head1 LICENSE |
678 | |
679 | This library is free software and may be distributed under the same terms as |
680 | Perl 5 itself. |
681 | |
682 | =cut |
683 | |