Commit | Line | Data |
0daa11f3 |
1 | package Log::Contextual; |
2 | |
a2777569 |
3 | use strict; |
4 | use warnings; |
2033c911 |
5 | |
6d77ba42 |
6 | our $VERSION = '0.00304'; |
2033c911 |
7 | |
ae9785e2 |
8 | my @levels = qw(debug trace warn info error fatal); |
9 | |
2033c911 |
10 | require Exporter; |
f11f9542 |
11 | use Data::Dumper::Concise; |
5b094c87 |
12 | use Scalar::Util 'blessed'; |
2033c911 |
13 | |
a2777569 |
14 | BEGIN { our @ISA = qw(Exporter) } |
2033c911 |
15 | |
ae9785e2 |
16 | my @dlog = ((map "Dlog_$_", @levels), (map "DlogS_$_", @levels)); |
17 | |
18 | my @log = ((map "log_$_", @levels), (map "logS_$_", @levels)); |
f11f9542 |
19 | |
b144ba01 |
20 | eval { |
21 | require Log::Log4perl; |
22 | die if $Log::Log4perl::VERSION < 1.29; |
23 | Log::Log4perl->wrapper_register(__PACKAGE__) |
24 | }; |
25 | |
a2777569 |
26 | our @EXPORT_OK = ( |
f11f9542 |
27 | @dlog, @log, |
9b8e24d5 |
28 | qw( set_logger with_logger ) |
f11f9542 |
29 | ); |
30 | |
a2777569 |
31 | our %EXPORT_TAGS = ( |
f11f9542 |
32 | dlog => \@dlog, |
33 | log => \@log, |
3dc9bd3c |
34 | all => [@dlog, @log], |
f11f9542 |
35 | ); |
36 | |
37 | sub import { |
a2777569 |
38 | my $package = shift; |
a2777569 |
39 | |
1e9144f0 |
40 | my $skipnext; |
41 | my @rest; |
a2777569 |
42 | for my $idx ( 0 .. $#_ ) { |
1e9144f0 |
43 | if ($skipnext) { |
44 | $skipnext--; |
45 | next; |
46 | } |
47 | |
3ccc9c47 |
48 | my $val = $_[$idx]; |
1e9144f0 |
49 | if (!defined $val) { |
50 | next; |
51 | } elsif ( $val eq '-logger' ) { |
a2777569 |
52 | set_logger($_[$idx + 1]); |
1e9144f0 |
53 | $skipnext = 1; |
54 | } elsif ( $val eq '-package_logger' ) { |
e2b4b29c |
55 | _set_package_logger_for(scalar caller, $_[$idx + 1]); |
1e9144f0 |
56 | $skipnext = 1; |
57 | } elsif ( $val eq '-default_logger' ) { |
3ccc9c47 |
58 | _set_default_logger_for(scalar caller, $_[$idx + 1]); |
1e9144f0 |
59 | $skipnext = 1; |
60 | } else { |
61 | push @rest, $val; |
a2777569 |
62 | } |
63 | } |
1e9144f0 |
64 | |
65 | die 'Log::Contextual does not have a default import list' |
66 | unless @rest; |
67 | |
68 | $package->export_to_level(1, $package, @rest); |
f11f9542 |
69 | } |
2033c911 |
70 | |
7cec609c |
71 | our $Get_Logger; |
5d8f2b84 |
72 | our %Default_Logger; |
e2b4b29c |
73 | our %Package_Logger; |
5d8f2b84 |
74 | |
3ccc9c47 |
75 | sub _set_default_logger_for { |
76 | my $logger = $_[1]; |
77 | if(ref $logger ne 'CODE') { |
78 | die 'logger was not a CodeRef or a logger object. Please try again.' |
79 | unless blessed($logger); |
80 | $logger = do { my $l = $logger; sub { $l } } |
81 | } |
82 | $Default_Logger{$_[0]} = $logger |
83 | } |
06e908c3 |
84 | |
e2b4b29c |
85 | sub _set_package_logger_for { |
86 | my $logger = $_[1]; |
87 | if(ref $logger ne 'CODE') { |
88 | die 'logger was not a CodeRef or a logger object. Please try again.' |
89 | unless blessed($logger); |
90 | $logger = do { my $l = $logger; sub { $l } } |
91 | } |
92 | $Package_Logger{$_[0]} = $logger |
93 | } |
94 | |
5d8f2b84 |
95 | sub _get_logger($) { |
96 | my $package = shift; |
97 | ( |
e2b4b29c |
98 | $Package_Logger{$package} || |
5d8f2b84 |
99 | $Get_Logger || |
100 | $Default_Logger{$package} || |
101 | die q( no logger set! you can't try to log something without a logger! ) |
06e908c3 |
102 | )->($package); |
5d8f2b84 |
103 | } |
7cec609c |
104 | |
8dc5a747 |
105 | sub set_logger { |
106 | my $logger = $_[0]; |
5b094c87 |
107 | if(ref $logger ne 'CODE') { |
108 | die 'logger was not a CodeRef or a logger object. Please try again.' |
109 | unless blessed($logger); |
110 | $logger = do { my $l = $logger; sub { $l } } |
111 | } |
5d8f2b84 |
112 | |
113 | warn 'set_logger (or -logger) called more than once! This is a bad idea!' |
114 | if $Get_Logger; |
8dc5a747 |
115 | $Get_Logger = $logger; |
7cec609c |
116 | } |
117 | |
98833ffb |
118 | sub with_logger { |
119 | my $logger = $_[0]; |
5b094c87 |
120 | if(ref $logger ne 'CODE') { |
121 | die 'logger was not a CodeRef or a logger object. Please try again.' |
122 | unless blessed($logger); |
123 | $logger = do { my $l = $logger; sub { $l } } |
124 | } |
98833ffb |
125 | local $Get_Logger = $logger; |
80c3e48b |
126 | $_[1]->(); |
2daff231 |
127 | } |
128 | |
d11de6ae |
129 | sub _do_log { |
130 | my $level = shift; |
131 | my $logger = shift; |
132 | my $code = shift; |
133 | my @values = @_; |
134 | |
d11de6ae |
135 | $logger->$level($code->(@_)) |
136 | if $logger->${\"is_$level"}; |
137 | @values |
138 | } |
139 | |
140 | sub _do_logS { |
141 | my $level = shift; |
142 | my $logger = shift; |
143 | my $code = shift; |
144 | my $value = shift; |
145 | |
d11de6ae |
146 | $logger->$level($code->($value)) |
147 | if $logger->${\"is_$level"}; |
709d11fe |
148 | $value |
149 | } |
150 | |
ae9785e2 |
151 | for my $level (@levels) { |
152 | no strict 'refs'; |
a4273dbf |
153 | |
ae9785e2 |
154 | *{"log_$level"} = sub (&@) { |
155 | _do_log( $level => _get_logger( caller ), shift @_, @_) |
156 | }; |
a4273dbf |
157 | |
ae9785e2 |
158 | *{"logS_$level"} = sub (&$) { |
159 | _do_logS( $level => _get_logger( caller ), $_[0], $_[1]) |
160 | }; |
a4273dbf |
161 | |
ae9785e2 |
162 | *{"Dlog_$level"} = sub (&@) { |
163 | my $code = shift; |
164 | local $_ = (@_?Data::Dumper::Concise::Dumper @_:'()'); |
165 | return _do_log( $level => _get_logger( caller ), $code, @_ ); |
166 | }; |
a4273dbf |
167 | |
ae9785e2 |
168 | *{"DlogS_$level"} = sub (&$) { |
169 | local $_ = Data::Dumper::Concise::Dumper $_[1]; |
170 | _do_logS( $level => _get_logger( caller ), $_[0], $_[1] ) |
171 | }; |
f11f9542 |
172 | } |
173 | |
0daa11f3 |
174 | 1; |
0a3750e2 |
175 | |
176 | __END__ |
177 | |
2daff231 |
178 | =head1 NAME |
179 | |
8bc568d2 |
180 | Log::Contextual - Simple logging interface with a contextual log |
2daff231 |
181 | |
182 | =head1 SYNOPSIS |
183 | |
9b8e24d5 |
184 | use Log::Contextual qw( :log :dlog set_logger with_logger ); |
5b094c87 |
185 | use Log::Contextual::SimpleLogger; |
186 | use Log::Log4perl ':easy'; |
187 | Log::Log4perl->easy_init($DEBUG); |
2daff231 |
188 | |
2daff231 |
189 | |
5b094c87 |
190 | my $logger = Log::Log4perl->get_logger; |
191 | |
192 | set_logger $logger; |
2daff231 |
193 | |
9b8e24d5 |
194 | log_debug { 'program started' }; |
2daff231 |
195 | |
196 | sub foo { |
9b8e24d5 |
197 | with_logger(Log::Contextual::SimpleLogger->new({ |
198 | levels => [qw( trace debug )] |
21431192 |
199 | }) => sub { |
200 | log_trace { 'foo entered' }; |
9b8e24d5 |
201 | my ($foo, $bar) = Dlog_trace { "params for foo: $_" } @_; |
2daff231 |
202 | # ... |
21431192 |
203 | log_trace { 'foo left' }; |
9b8e24d5 |
204 | }); |
2daff231 |
205 | } |
206 | |
5b094c87 |
207 | foo(); |
208 | |
9fe4eeb3 |
209 | Beginning with version 1.008 L<Log::Dispatchouli> also works out of the box |
210 | with C<Log::Contextual>: |
211 | |
212 | use Log::Contextual qw( :log :dlog set_logger ); |
213 | use Log::Dispatchouli; |
214 | my $ld = Log::Dispatchouli->new({ |
215 | ident => 'slrtbrfst', |
216 | to_stderr => 1, |
217 | debug => 1, |
218 | }); |
219 | |
220 | set_logger $ld; |
221 | |
222 | log_debug { 'program started' }; |
223 | |
2daff231 |
224 | =head1 DESCRIPTION |
225 | |
3dc9bd3c |
226 | This module is a simple interface to extensible logging. It is bundled with a |
227 | really basic logger, L<Log::Contextual::SimpleLogger>, but in general you |
228 | should use a real logger instead of that. For something more serious but not |
9fe4eeb3 |
229 | overly complicated, try L<Log::Dispatchouli> (see L</SYNOPSIS> for example.) |
3dc9bd3c |
230 | |
231 | =head1 OPTIONS |
232 | |
c154d18a |
233 | =head2 -logger |
234 | |
3dc9bd3c |
235 | When you import this module you may use C<-logger> as a shortcut for |
236 | L<set_logger>, for example: |
237 | |
238 | use Log::Contextual::SimpleLogger; |
9b8e24d5 |
239 | use Log::Contextual qw( :dlog ), |
240 | -logger => Log::Contextual::SimpleLogger->new({ levels => [qw( debug )] }); |
3dc9bd3c |
241 | |
242 | sometimes you might want to have the logger handy for other stuff, in which |
243 | case you might try something like the following: |
244 | |
245 | my $var_log; |
246 | BEGIN { $var_log = VarLogger->new } |
9b8e24d5 |
247 | use Log::Contextual qw( :dlog ), -logger => $var_log; |
3dc9bd3c |
248 | |
e2b4b29c |
249 | =head2 -package_logger |
250 | |
251 | The C<-package_logger> import option is similar to the C<-logger> import option |
252 | except C<-package_logger> sets the the logger for the current package. |
253 | |
254 | Unlike L</-default_logger>, C<-package_logger> cannot be overridden with |
255 | L</set_logger>. |
256 | |
257 | package My::Package; |
258 | use Log::Contextual::SimpleLogger; |
259 | use Log::Contextual qw( :log ), |
260 | -package_logger => Log::Contextual::WarnLogger->new({ |
261 | env_prefix => 'MY_PACKAGE' |
262 | }); |
263 | |
264 | If you are interested in using this package for a module you are putting on |
265 | CPAN we recommend L<Log::Contextual::WarnLogger> for your package logger. |
266 | |
c154d18a |
267 | =head2 -default_logger |
268 | |
269 | The C<-default_logger> import option is similar to the C<-logger> import option |
e2b4b29c |
270 | except C<-default_logger> sets the the B<default> logger for the current package. |
c154d18a |
271 | |
272 | Basically it sets the logger to be used if C<set_logger> is never called; so |
273 | |
274 | package My::Package; |
275 | use Log::Contextual::SimpleLogger; |
276 | use Log::Contextual qw( :log ), |
277 | -default_logger => Log::Contextual::WarnLogger->new({ |
ae59bbe3 |
278 | env_prefix => 'MY_PACKAGE' |
c154d18a |
279 | }); |
280 | |
3dc9bd3c |
281 | =head1 A WORK IN PROGRESS |
282 | |
283 | This module is certainly not complete, but we will not break the interface |
284 | lightly, so I would say it's safe to use in production code. The main result |
285 | from that at this point is that doing: |
286 | |
287 | use Log::Contextual; |
288 | |
289 | will die as we do not yet know what the defaults should be. If it turns out |
290 | that nearly everyone uses the C<:log> tag and C<:dlog> is really rare, we'll |
9b8e24d5 |
291 | probably make C<:log> the default. But only time and usage will tell. |
2daff231 |
292 | |
293 | =head1 FUNCTIONS |
294 | |
295 | =head2 set_logger |
296 | |
297 | my $logger = WarnLogger->new; |
21431192 |
298 | set_logger $logger; |
299 | |
0e13e261 |
300 | Arguments: C<Ref|CodeRef $returning_logger> |
2daff231 |
301 | |
21431192 |
302 | C<set_logger> will just set the current logger to whatever you pass it. It |
303 | expects a C<CodeRef>, but if you pass it something else it will wrap it in a |
06e908c3 |
304 | C<CodeRef> for you. C<set_logger> is really meant only to be called from a |
305 | top-level script. To avoid foot-shooting the function will warn if you call it |
306 | more than once. |
2daff231 |
307 | |
308 | =head2 with_logger |
309 | |
310 | my $logger = WarnLogger->new; |
21431192 |
311 | with_logger $logger => sub { |
2daff231 |
312 | if (1 == 0) { |
313 | log_fatal { 'Non Logical Universe Detected' }; |
314 | } else { |
315 | log_info { 'All is good' }; |
316 | } |
80c3e48b |
317 | }; |
2daff231 |
318 | |
0e13e261 |
319 | Arguments: C<Ref|CodeRef $returning_logger, CodeRef $to_execute> |
2daff231 |
320 | |
21431192 |
321 | C<with_logger> sets the logger for the scope of the C<CodeRef> C<$to_execute>. |
0e13e261 |
322 | As with L</set_logger>, C<with_logger> will wrap C<$returning_logger> with a |
21431192 |
323 | C<CodeRef> if needed. |
2daff231 |
324 | |
21431192 |
325 | =head2 log_$level |
2daff231 |
326 | |
0e13e261 |
327 | Import Tag: C<:log> |
3dc9bd3c |
328 | |
0e13e261 |
329 | Arguments: C<CodeRef $returning_message, @args> |
2daff231 |
330 | |
21431192 |
331 | All of the following six functions work the same except that a different method |
332 | is called on the underlying C<$logger> object. The basic pattern is: |
2daff231 |
333 | |
0e13e261 |
334 | sub log_$level (&@) { |
21431192 |
335 | if ($logger->is_$level) { |
0e13e261 |
336 | $logger->$level(shift->(@_)); |
21431192 |
337 | } |
0e13e261 |
338 | @_ |
21431192 |
339 | } |
2daff231 |
340 | |
0e13e261 |
341 | Note that the function returns it's arguments. This can be used in a number of |
342 | ways, but often it's convenient just for partial inspection of passthrough data |
343 | |
344 | my @friends = log_trace { |
345 | 'friends list being generated, data from first friend: ' . |
346 | Dumper($_[0]->TO_JSON) |
347 | } generate_friend_list(); |
348 | |
349 | If you want complete inspection of passthrough data, take a look at the |
350 | L</Dlog_$level> functions. |
351 | |
21431192 |
352 | =head3 log_trace |
2daff231 |
353 | |
21431192 |
354 | log_trace { 'entered method foo with args ' join q{,}, @args }; |
2daff231 |
355 | |
21431192 |
356 | =head3 log_debug |
2daff231 |
357 | |
21431192 |
358 | log_debug { 'entered method foo' }; |
2daff231 |
359 | |
21431192 |
360 | =head3 log_info |
2daff231 |
361 | |
21431192 |
362 | log_info { 'started process foo' }; |
2daff231 |
363 | |
21431192 |
364 | =head3 log_warn |
2daff231 |
365 | |
21431192 |
366 | log_warn { 'possible misconfiguration at line 10' }; |
2daff231 |
367 | |
21431192 |
368 | =head3 log_error |
2daff231 |
369 | |
21431192 |
370 | log_error { 'non-numeric user input!' }; |
2daff231 |
371 | |
21431192 |
372 | =head3 log_fatal |
2daff231 |
373 | |
374 | log_fatal { '1 is never equal to 0!' }; |
375 | |
0e13e261 |
376 | =head2 logS_$level |
377 | |
378 | Import Tag: C<:log> |
379 | |
380 | Arguments: C<CodeRef $returning_message, Item $arg> |
381 | |
382 | This is really just a special case of the L</log_$level> functions. It forces |
383 | scalar context when that is what you need. Other than that it works exactly |
384 | same: |
385 | |
386 | my $friend = logS_trace { |
387 | 'I only have one friend: ' . Dumper($_[0]->TO_JSON) |
388 | } friend(); |
389 | |
390 | See also: L</DlogS_$level>. |
391 | |
21431192 |
392 | =head2 Dlog_$level |
393 | |
0e13e261 |
394 | Import Tag: C<:dlog> |
3dc9bd3c |
395 | |
0e13e261 |
396 | Arguments: C<CodeRef $returning_message, @args> |
2daff231 |
397 | |
0e13e261 |
398 | All of the following six functions work the same as their L</log_$level> |
9b8e24d5 |
399 | brethren, except they return what is passed into them and put the stringified |
21431192 |
400 | (with L<Data::Dumper::Concise>) version of their args into C<$_>. This means |
401 | you can do cool things like the following: |
402 | |
403 | my @nicks = Dlog_debug { "names: $_" } map $_->value, $frew->names->all; |
404 | |
405 | and the output might look something like: |
406 | |
407 | names: "fREW" |
408 | "fRIOUX" |
409 | "fROOH" |
410 | "fRUE" |
411 | "fiSMBoC" |
412 | |
413 | =head3 Dlog_trace |
414 | |
9b8e24d5 |
415 | my ($foo, $bar) = Dlog_trace { "entered method foo with args: $_" } @_; |
21431192 |
416 | |
417 | =head3 Dlog_debug |
418 | |
419 | Dlog_debug { "random data structure: $_" } { foo => $bar }; |
420 | |
421 | =head3 Dlog_info |
422 | |
423 | return Dlog_info { "html from method returned: $_" } "<html>...</html>"; |
424 | |
425 | =head3 Dlog_warn |
426 | |
427 | Dlog_warn { "probably invalid value: $_" } $foo; |
428 | |
429 | =head3 Dlog_error |
430 | |
431 | Dlog_error { "non-numeric user input! ($_)" } $port; |
2daff231 |
432 | |
21431192 |
433 | =head3 Dlog_fatal |
2daff231 |
434 | |
21431192 |
435 | Dlog_fatal { '1 is never equal to 0!' } 'ZOMG ZOMG' if 1 == 0; |
2daff231 |
436 | |
83b33eb5 |
437 | =head2 DlogS_$level |
438 | |
0e13e261 |
439 | Import Tag: C<:dlog> |
3dc9bd3c |
440 | |
0e13e261 |
441 | Arguments: C<CodeRef $returning_message, Item $arg> |
83b33eb5 |
442 | |
0e13e261 |
443 | Like L</logS_$level>, these functions are a special case of L</Dlog_$level>. |
444 | They only take a single scalar after the C<$returning_message> instead of |
445 | slurping up (and also setting C<wantarray>) all the C<@args> |
83b33eb5 |
446 | |
447 | my $pals_rs = DlogS_debug { "pals resultset: $_" } |
448 | $schema->resultset('Pals')->search({ perlers => 1 }); |
449 | |
3dc9bd3c |
450 | =head1 LOGGER INTERFACE |
451 | |
452 | Because this module is ultimately pretty looking glue (glittery?) with the |
453 | awesome benefit of the Contextual part, users will often want to make their |
454 | favorite logger work with it. The following are the methods that should be |
455 | implemented in the logger: |
456 | |
457 | is_trace |
458 | is_debug |
459 | is_info |
460 | is_warn |
461 | is_error |
462 | is_fatal |
463 | trace |
464 | debug |
465 | info |
466 | warn |
467 | error |
468 | fatal |
469 | |
470 | The first six merely need to return true if that level is enabled. The latter |
471 | six take the results of whatever the user returned from their coderef and log |
472 | them. For a basic example see L<Log::Contextual::SimpleLogger>. |
473 | |
2daff231 |
474 | =head1 AUTHOR |
475 | |
476 | frew - Arthur Axel "fREW" Schmidt <frioux@gmail.com> |
477 | |
478 | =head1 DESIGNER |
479 | |
480 | mst - Matt S. Trout <mst@shadowcat.co.uk> |
481 | |
482 | =head1 COPYRIGHT |
483 | |
484 | Copyright (c) 2010 the Log::Contextual L</AUTHOR> and L</DESIGNER> as listed |
485 | above. |
486 | |
487 | =head1 LICENSE |
488 | |
489 | This library is free software and may be distributed under the same terms as |
490 | Perl 5 itself. |
491 | |
492 | =cut |
493 | |