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2 | |
2 | |
3 | AnyEvent::Log - simple logging "framework" |
3 | AnyEvent::Log - simple logging "framework" |
4 | |
4 | |
5 | =head1 SYNOPSIS |
5 | =head1 SYNOPSIS |
6 | |
6 | |
7 | # simple use |
7 | Simple uses: |
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8 | |
8 | use AnyEvent; |
9 | use AnyEvent; |
9 | |
10 | |
10 | AE::log debug => "hit my knee"; |
11 | AE::log debug => "hit my knee"; |
11 | AE::log warn => "it's a bit too hot"; |
12 | AE::log warn => "it's a bit too hot"; |
12 | AE::log error => "the flag was false!"; |
13 | AE::log error => "the flag was false!"; |
13 | AE::log fatal => "the bit toggled! run!"; |
14 | AE::log fatal => "the bit toggled! run!"; # never returns |
14 | |
15 | |
15 | # "complex" use |
16 | "Complex" uses (for speed sensitive code): |
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17 | |
16 | use AnyEvent::Log; |
18 | use AnyEvent::Log; |
17 | |
19 | |
18 | my $tracer = AnyEvent::Log::logger trace => \$my $trace; |
20 | my $tracer = AnyEvent::Log::logger trace => \$my $trace; |
19 | |
21 | |
20 | $tracer->("i am here") if $trace; |
22 | $tracer->("i am here") if $trace; |
21 | $tracer->(sub { "lots of data: " . Dumper $self }) if $trace; |
23 | $tracer->(sub { "lots of data: " . Dumper $self }) if $trace; |
22 | |
24 | |
23 | # configuration |
25 | Configuration (also look at the EXAMPLES section): |
24 | |
26 | |
25 | # set logging for the current package to errors and higher only |
27 | # set logging for the current package to errors and higher only |
26 | AnyEvent::Log::ctx->level ("error"); |
28 | AnyEvent::Log::ctx->level ("error"); |
27 | |
29 | |
28 | # set logging globally to anything below debug |
30 | # set logging level to suppress anything below "notice" |
29 | $AnyEvent::Log::FILTER->level ("notice"); |
31 | $AnyEvent::Log::FILTER->level ("notice"); |
30 | |
32 | |
31 | # see also EXAMPLES, below |
33 | # send all critical and higher priority messages to syslog, |
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34 | # regardless of (most) other settings |
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35 | $AnyEvent::Log::COLLECT->attach (new AnyEvent::Log::Ctx |
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36 | level => "critical", |
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37 | log_to_syslog => "user", |
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38 | ); |
32 | |
39 | |
33 | =head1 DESCRIPTION |
40 | =head1 DESCRIPTION |
34 | |
41 | |
35 | This module implements a relatively simple "logging framework". It doesn't |
42 | This module implements a relatively simple "logging framework". It doesn't |
36 | attempt to be "the" logging solution or even "a" logging solution for |
43 | attempt to be "the" logging solution or even "a" logging solution for |
… | |
… | |
42 | will be logged, unless you set C<PERL_ANYEVENT_VERBOSE> to a higher number |
49 | will be logged, unless you set C<PERL_ANYEVENT_VERBOSE> to a higher number |
43 | before starting your program, or change the logging level at runtime with |
50 | before starting your program, or change the logging level at runtime with |
44 | something like: |
51 | something like: |
45 | |
52 | |
46 | use AnyEvent::Log; |
53 | use AnyEvent::Log; |
47 | AnyEvent::Log::FILTER->level ("info"); |
54 | $AnyEvent::Log::FILTER->level ("info"); |
48 | |
55 | |
49 | The design goal behind this module was to keep it simple (and small), |
56 | The design goal behind this module was to keep it simple (and small), |
50 | but make it powerful enough to be potentially useful for any module, and |
57 | but make it powerful enough to be potentially useful for any module, and |
51 | extensive enough for the most common tasks, such as logging to multiple |
58 | extensive enough for the most common tasks, such as logging to multiple |
52 | targets, or being able to log into a database. |
59 | targets, or being able to log into a database. |
53 | |
60 | |
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61 | The module is also usable before AnyEvent itself is initialised, in which |
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62 | case some of the functionality might be reduced. |
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63 | |
54 | The amount of documentation might indicate otherwise, but the module is |
64 | The amount of documentation might indicate otherwise, but the runtime part |
55 | still just below 300 lines of code. |
65 | of the module is still just below 300 lines of code. |
56 | |
66 | |
57 | =head1 LOGGING LEVELS |
67 | =head1 LOGGING LEVELS |
58 | |
68 | |
59 | Logging levels in this module range from C<1> (highest priority) to C<9> |
69 | Logging levels in this module range from C<1> (highest priority) to C<9> |
60 | (lowest priority). Note that the lowest numerical value is the highest |
70 | (lowest priority). Note that the lowest numerical value is the highest |
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101 | |
111 | |
102 | use Carp (); |
112 | use Carp (); |
103 | use POSIX (); |
113 | use POSIX (); |
104 | |
114 | |
105 | use AnyEvent (); BEGIN { AnyEvent::common_sense } |
115 | use AnyEvent (); BEGIN { AnyEvent::common_sense } |
106 | use AnyEvent::Util (); |
116 | #use AnyEvent::Util (); need to load this in a delayed fashion, as it uses AE::log |
107 | |
117 | |
108 | our $VERSION = $AnyEvent::VERSION; |
118 | our $VERSION = $AnyEvent::VERSION; |
109 | |
119 | |
110 | our ($COLLECT, $FILTER, $LOG); |
120 | our ($COLLECT, $FILTER, $LOG); |
111 | |
121 | |
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138 | $ctx |
148 | $ctx |
139 | } |
149 | } |
140 | |
150 | |
141 | =item AnyEvent::Log::log $level, $msg[, @args] |
151 | =item AnyEvent::Log::log $level, $msg[, @args] |
142 | |
152 | |
143 | Requests logging of the given C<$msg> with the given log level. |
153 | Requests logging of the given C<$msg> with the given log level, and |
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154 | returns true if the message was logged I<somewhere>. |
144 | |
155 | |
145 | For C<fatal> log levels, the program will abort. |
156 | For C<fatal> log levels, the program will abort. |
146 | |
157 | |
147 | If only a C<$msg> is given, it is logged as-is. With extra C<@args>, the |
158 | If only a C<$msg> is given, it is logged as-is. With extra C<@args>, the |
148 | C<$msg> is interpreted as an sprintf format string. |
159 | C<$msg> is interpreted as an sprintf format string. |
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154 | supposed to return the message. It will be called only then the message |
165 | supposed to return the message. It will be called only then the message |
155 | actually gets logged, which is useful if it is costly to create the |
166 | actually gets logged, which is useful if it is costly to create the |
156 | message in the first place. |
167 | message in the first place. |
157 | |
168 | |
158 | Whether the given message will be logged depends on the maximum log level |
169 | Whether the given message will be logged depends on the maximum log level |
159 | and the caller's package. |
170 | and the caller's package. The return value can be used to ensure that |
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171 | messages or not "lost" - for example, when L<AnyEvent::Debug> detects a |
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172 | runtime error it tries to log it at C<die> level, but if that message is |
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173 | lost it simply uses warn. |
160 | |
174 | |
161 | Note that you can (and should) call this function as C<AnyEvent::log> or |
175 | Note that you can (and should) call this function as C<AnyEvent::log> or |
162 | C<AE::log>, without C<use>-ing this module if possible (i.e. you don't |
176 | C<AE::log>, without C<use>-ing this module if possible (i.e. you don't |
163 | need any additional functionality), as those functions will load the |
177 | need any additional functionality), as those functions will load the |
164 | logging module on demand only. They are also much shorter to write. |
178 | logging module on demand only. They are also much shorter to write. |
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192 | info => 7, |
206 | info => 7, |
193 | debug => 8, |
207 | debug => 8, |
194 | trace => 9, |
208 | trace => 9, |
195 | ); |
209 | ); |
196 | |
210 | |
197 | sub now () { time } |
211 | our $TIME_EXACT; |
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212 | |
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213 | sub exact_time($) { |
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214 | $TIME_EXACT = shift; |
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215 | *_ts = $AnyEvent::MODEL |
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216 | ? $TIME_EXACT ? \&AE::now : \&AE::time |
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217 | : sub () { $TIME_EXACT ? do { require Time::HiRes; Time::HiRes::time () } : time }; |
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218 | } |
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219 | |
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220 | BEGIN { |
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221 | exact_time 0; |
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222 | } |
198 | |
223 | |
199 | AnyEvent::post_detect { |
224 | AnyEvent::post_detect { |
200 | *now = \&AE::now; |
225 | exact_time $TIME_EXACT; |
201 | }; |
226 | }; |
202 | |
227 | |
203 | our @LEVEL2STR = qw(0 fatal alert crit error warn note info debug trace); |
228 | our @LEVEL2STR = qw(0 fatal alert crit error warn note info debug trace); |
204 | |
229 | |
205 | # time, ctx, level, msg |
230 | # time, ctx, level, msg |
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224 | ? $level+0 |
249 | ? $level+0 |
225 | : $STR2LEVEL{$level} || Carp::croak "$level: not a valid logging level, caught"; |
250 | : $STR2LEVEL{$level} || Carp::croak "$level: not a valid logging level, caught"; |
226 | |
251 | |
227 | my $mask = 1 << $level; |
252 | my $mask = 1 << $level; |
228 | |
253 | |
229 | my (%seen, @ctx, $now, $fmt); |
254 | my ($success, %seen, @ctx, $now, $fmt); |
230 | |
255 | |
231 | do |
256 | do |
232 | { |
257 | { |
233 | # skip if masked |
258 | # skip if masked |
234 | if ($ctx->[1] & $mask && !$seen{$ctx+0}++) { |
259 | if ($ctx->[1] & $mask && !$seen{$ctx+0}++) { |
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238 | # now get raw message, unless we have it already |
263 | # now get raw message, unless we have it already |
239 | unless ($now) { |
264 | unless ($now) { |
240 | $format = $format->() if ref $format; |
265 | $format = $format->() if ref $format; |
241 | $format = sprintf $format, @args if @args; |
266 | $format = sprintf $format, @args if @args; |
242 | $format =~ s/\n$//; |
267 | $format =~ s/\n$//; |
243 | $now = AE::now; |
268 | $now = _ts; |
244 | }; |
269 | }; |
245 | |
270 | |
246 | # format msg |
271 | # format msg |
247 | my $str = $ctx->[4] |
272 | my $str = $ctx->[4] |
248 | ? $ctx->[4]($now, $_[0], $level, $format) |
273 | ? $ctx->[4]($now, $_[0], $level, $format) |
249 | : ($fmt ||= _format $now, $_[0], $level, $format); |
274 | : ($fmt ||= _format $now, $_[0], $level, $format); |
250 | |
275 | |
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276 | $success = 1; |
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277 | |
251 | $ctx->[3]($str, $_[0], $level) |
278 | $ctx->[3]($str) |
252 | or push @ctx, values %{ $ctx->[2] }; # not consumed - propagate |
279 | or push @ctx, values %{ $ctx->[2] }; # not consumed - propagate |
253 | } else { |
280 | } else { |
254 | push @ctx, values %{ $ctx->[2] }; # not masked - propagate |
281 | push @ctx, values %{ $ctx->[2] }; # not masked - propagate |
255 | } |
282 | } |
256 | } |
283 | } |
257 | } |
284 | } |
258 | while $ctx = pop @ctx; |
285 | while $ctx = pop @ctx; |
259 | |
286 | |
260 | exit 1 if $level <= 1; |
287 | exit 1 if $level <= 1; |
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288 | |
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289 | $success |
261 | } |
290 | } |
262 | |
291 | |
263 | sub log($$;@) { |
292 | sub log($$;@) { |
264 | _log |
293 | _log |
265 | $CTX{ (caller)[0] } ||= _pkg_ctx +(caller)[0], |
294 | $CTX{ (caller)[0] } ||= _pkg_ctx +(caller)[0], |
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269 | *AnyEvent::log = *AE::log = \&log; |
298 | *AnyEvent::log = *AE::log = \&log; |
270 | |
299 | |
271 | =item $logger = AnyEvent::Log::logger $level[, \$enabled] |
300 | =item $logger = AnyEvent::Log::logger $level[, \$enabled] |
272 | |
301 | |
273 | Creates a code reference that, when called, acts as if the |
302 | Creates a code reference that, when called, acts as if the |
274 | C<AnyEvent::Log::log> function was called at this point with the givne |
303 | C<AnyEvent::Log::log> function was called at this point with the given |
275 | level. C<$logger> is passed a C<$msg> and optional C<@args>, just as with |
304 | level. C<$logger> is passed a C<$msg> and optional C<@args>, just as with |
276 | the C<AnyEvent::Log::log> function: |
305 | the C<AnyEvent::Log::log> function: |
277 | |
306 | |
278 | my $debug_log = AnyEvent::Log::logger "debug"; |
307 | my $debug_log = AnyEvent::Log::logger "debug"; |
279 | |
308 | |
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339 | |
368 | |
340 | $LOGGER{$logger+0} = $logger; |
369 | $LOGGER{$logger+0} = $logger; |
341 | |
370 | |
342 | _reassess $logger+0; |
371 | _reassess $logger+0; |
343 | |
372 | |
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373 | require AnyEvent::Util; |
344 | my $guard = AnyEvent::Util::guard { |
374 | my $guard = AnyEvent::Util::guard (sub { |
345 | # "clean up" |
375 | # "clean up" |
346 | delete $LOGGER{$logger+0}; |
376 | delete $LOGGER{$logger+0}; |
347 | }; |
377 | }); |
348 | |
378 | |
349 | sub { |
379 | sub { |
350 | $guard if 0; # keep guard alive, but don't cause runtime overhead |
380 | $guard if 0; # keep guard alive, but don't cause runtime overhead |
351 | |
381 | |
352 | _log $ctx, $level, @_ |
382 | _log $ctx, $level, @_ |
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357 | sub logger($;$) { |
387 | sub logger($;$) { |
358 | _logger |
388 | _logger |
359 | $CTX{ (caller)[0] } ||= _pkg_ctx +(caller)[0], |
389 | $CTX{ (caller)[0] } ||= _pkg_ctx +(caller)[0], |
360 | @_ |
390 | @_ |
361 | } |
391 | } |
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392 | |
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393 | =item AnyEvent::Log::exact_time $on |
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394 | |
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395 | By default, C<AnyEvent::Log> will use C<AE::now>, i.e. the cached |
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396 | eventloop time, for the log timestamps. After calling this function with a |
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397 | true value it will instead resort to C<AE::time>, i.e. fetch the current |
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398 | time on each log message. This only makes a difference for event loops |
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399 | that actually cache the time (such as L<EV> or L<AnyEvent::Loop>). |
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400 | |
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401 | This setting can be changed at any time by calling this function. |
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402 | |
|
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403 | Since C<AnyEvent::Log> has to work even before the L<AnyEvent> has been |
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404 | initialised, this switch will also decide whether to use C<CORE::time> or |
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405 | C<Time::HiRes::time> when logging a message before L<AnyEvent> becomes |
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406 | available. |
362 | |
407 | |
363 | =back |
408 | =back |
364 | |
409 | |
365 | =head1 LOGGING CONTEXTS |
410 | =head1 LOGGING CONTEXTS |
366 | |
411 | |
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498 | } |
543 | } |
499 | |
544 | |
500 | @$_ = ($_->[0], (1 << 10) - 1 - 1) |
545 | @$_ = ($_->[0], (1 << 10) - 1 - 1) |
501 | for $LOG, $FILTER, $COLLECT; |
546 | for $LOG, $FILTER, $COLLECT; |
502 | |
547 | |
503 | $LOG->slaves; |
548 | #$LOG->slaves; |
504 | $LOG->title ('$AnyEvent::Log::LOG'); |
549 | $LOG->title ('$AnyEvent::Log::LOG'); |
505 | $LOG->log_cb (sub { |
550 | $LOG->log_to_warn; |
506 | warn shift; |
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507 | 0 |
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508 | }); |
|
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509 | |
551 | |
510 | $FILTER->slaves ($LOG); |
552 | $FILTER->slaves ($LOG); |
511 | $FILTER->title ('$AnyEvent::Log::FILTER'); |
553 | $FILTER->title ('$AnyEvent::Log::FILTER'); |
512 | $FILTER->level ($AnyEvent::VERBOSE); |
554 | $FILTER->level ($AnyEvent::VERBOSE); |
513 | |
555 | |
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734 | the logging (which consists of formatting the message and printing it or |
776 | the logging (which consists of formatting the message and printing it or |
735 | whatever it wants to do with it). |
777 | whatever it wants to do with it). |
736 | |
778 | |
737 | =over 4 |
779 | =over 4 |
738 | |
780 | |
739 | =item $ctx->log_cb ($cb->($str, $orig_ctx, $level)) |
781 | =item $ctx->log_cb ($cb->($str) |
740 | |
782 | |
741 | Replaces the logging callback on the context (C<undef> disables the |
783 | Replaces the logging callback on the context (C<undef> disables the |
742 | logging callback). |
784 | logging callback). |
743 | |
785 | |
744 | The logging callback is responsible for handling formatted log messages |
786 | The logging callback is responsible for handling formatted log messages |
745 | (see C<fmt_cb> below) - normally simple text strings that end with a |
787 | (see C<fmt_cb> below) - normally simple text strings that end with a |
746 | newline (and are possibly multiline themselves). In addition to the |
788 | newline (and are possibly multiline themselves). |
747 | message, which is often the only argument you need to look at, it is |
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748 | passed the numeric log level and originating context. |
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749 | |
789 | |
750 | It also has to return true iff it has consumed the log message, and false |
790 | It also has to return true iff it has consumed the log message, and false |
751 | if it hasn't. Consuming a message means that it will not be sent to any |
791 | if it hasn't. Consuming a message means that it will not be sent to any |
752 | slave context. When in doubt, return C<0> from your logging callback. |
792 | slave context. When in doubt, return C<0> from your logging callback. |
753 | |
793 | |
… | |
… | |
764 | "trace". The messages will still be generated, though, which can slow down |
804 | "trace". The messages will still be generated, though, which can slow down |
765 | your program. |
805 | your program. |
766 | |
806 | |
767 | $ctx->levels ("debug", "trace"); |
807 | $ctx->levels ("debug", "trace"); |
768 | $ctx->log_cb (sub { 1 }); # do not log, but eat debug and trace messages |
808 | $ctx->log_cb (sub { 1 }); # do not log, but eat debug and trace messages |
769 | |
|
|
770 | =item $ctx->log_to_file ($path) |
|
|
771 | |
|
|
772 | Sets the C<log_cb> to log to a file (by appending), unbuffered. |
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773 | |
|
|
774 | =item $ctx->log_to_path ($path) |
|
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775 | |
|
|
776 | Same as C<< ->log_to_file >>, but opens the file for each message. This |
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777 | is much slower, but allows you to change/move/rename/delete the file at |
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778 | basically any time. |
|
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779 | |
|
|
780 | =item $ctx->log_to_syslog ([$log_flags]) |
|
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781 | |
|
|
782 | Logs all messages via L<Sys::Syslog>, mapping C<trace> to C<debug> and all |
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783 | the others in the obvious way. If specified, then the C<$log_flags> are |
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784 | simply or'ed onto the priority argument and can contain any C<LOG_xxx> |
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785 | flags valid for Sys::Syslog::syslog, except for the priority levels. |
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786 | |
|
|
787 | Note that the default logging format includes a verbose timestamp, which |
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788 | is not so suited for syslog, so a simpler C<fmt_cb> might be useful: |
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789 | |
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790 | $ctx->log_to_syslog; |
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|
791 | $ctx->fmt_cb (sub { "($_[1][0]) $_[3]" }); |
|
|
792 | |
809 | |
793 | =item $ctx->fmt_cb ($fmt_cb->($timestamp, $orig_ctx, $level, $message)) |
810 | =item $ctx->fmt_cb ($fmt_cb->($timestamp, $orig_ctx, $level, $message)) |
794 | |
811 | |
795 | Replaces the formatting callback on the context (C<undef> restores the |
812 | Replaces the formatting callback on the context (C<undef> restores the |
796 | default formatter). |
813 | default formatter). |
… | |
… | |
799 | logging context, the (numeric) logging level and the raw message string |
816 | logging context, the (numeric) logging level and the raw message string |
800 | and needs to return a formatted log message. In most cases this will be a |
817 | and needs to return a formatted log message. In most cases this will be a |
801 | string, but it could just as well be an array reference that just stores |
818 | string, but it could just as well be an array reference that just stores |
802 | the values. |
819 | the values. |
803 | |
820 | |
804 | If, for some reaosn, you want to use C<caller> to find out more baout the |
821 | If, for some reason, you want to use C<caller> to find out more baout the |
805 | logger then you should walk up the call stack until you are no longer |
822 | logger then you should walk up the call stack until you are no longer |
806 | inside the C<AnyEvent::Log> package. |
823 | inside the C<AnyEvent::Log> package. |
807 | |
824 | |
808 | Example: format just the raw message, with numeric log level in angle |
825 | Example: format just the raw message, with numeric log level in angle |
809 | brackets. |
826 | brackets. |
… | |
… | |
828 | "$msg->[3]"; |
845 | "$msg->[3]"; |
829 | |
846 | |
830 | 0 |
847 | 0 |
831 | }); |
848 | }); |
832 | |
849 | |
|
|
850 | =item $ctx->log_to_warn |
|
|
851 | |
|
|
852 | Sets the C<log_cb> to simply use C<CORE::warn> to report any messages |
|
|
853 | (usually this logs to STDERR). |
|
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854 | |
|
|
855 | =item $ctx->log_to_file ($path) |
|
|
856 | |
|
|
857 | Sets the C<log_cb> to log to a file (by appending), unbuffered. |
|
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858 | |
|
|
859 | =item $ctx->log_to_path ($path) |
|
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860 | |
|
|
861 | Same as C<< ->log_to_file >>, but opens the file for each message. This |
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862 | is much slower, but allows you to change/move/rename/delete the file at |
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863 | basically any time. |
|
|
864 | |
|
|
865 | Needless(?) to say, if you do not want to be bitten by some evil person |
|
|
866 | calling C<chdir>, the path should be absolute. Doesn't help with |
|
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867 | C<chroot>, but hey... |
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|
868 | |
|
|
869 | =item $ctx->log_to_syslog ([$facility]) |
|
|
870 | |
|
|
871 | Logs all messages via L<Sys::Syslog>, mapping C<trace> to C<debug> and |
|
|
872 | all the others in the obvious way. If specified, then the C<$facility> is |
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873 | used as the facility (C<user>, C<auth>, C<local0> and so on). The default |
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874 | facility is C<user>. |
|
|
875 | |
|
|
876 | Note that this function also sets a C<fmt_cb> - the logging part requires |
|
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877 | an array reference with [$level, $str] as input. |
|
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878 | |
833 | =cut |
879 | =cut |
834 | |
880 | |
835 | sub log_cb { |
881 | sub log_cb { |
836 | my ($ctx, $cb) = @_; |
882 | my ($ctx, $cb) = @_; |
837 | |
883 | |
… | |
… | |
840 | |
886 | |
841 | sub fmt_cb { |
887 | sub fmt_cb { |
842 | my ($ctx, $cb) = @_; |
888 | my ($ctx, $cb) = @_; |
843 | |
889 | |
844 | $ctx->[4] = $cb; |
890 | $ctx->[4] = $cb; |
|
|
891 | } |
|
|
892 | |
|
|
893 | sub log_to_warn { |
|
|
894 | my ($ctx, $path) = @_; |
|
|
895 | |
|
|
896 | $ctx->log_cb (sub { |
|
|
897 | warn shift; |
|
|
898 | 0 |
|
|
899 | }); |
845 | } |
900 | } |
846 | |
901 | |
847 | sub log_to_file { |
902 | sub log_to_file { |
848 | my ($ctx, $path) = @_; |
903 | my ($ctx, $path) = @_; |
849 | |
904 | |
… | |
… | |
854 | syswrite $fh, shift; |
909 | syswrite $fh, shift; |
855 | 0 |
910 | 0 |
856 | }); |
911 | }); |
857 | } |
912 | } |
858 | |
913 | |
859 | sub log_to_file { |
914 | sub log_to_path { |
860 | my ($ctx, $path) = @_; |
915 | my ($ctx, $path) = @_; |
861 | |
916 | |
862 | $ctx->log_cb (sub { |
917 | $ctx->log_cb (sub { |
863 | open my $fh, ">>", $path |
918 | open my $fh, ">>", $path |
864 | or die "$path: $!"; |
919 | or die "$path: $!"; |
… | |
… | |
867 | 0 |
922 | 0 |
868 | }); |
923 | }); |
869 | } |
924 | } |
870 | |
925 | |
871 | sub log_to_syslog { |
926 | sub log_to_syslog { |
872 | my ($ctx, $flags) = @_; |
927 | my ($ctx, $facility) = @_; |
873 | |
928 | |
874 | require Sys::Syslog; |
929 | require Sys::Syslog; |
875 | |
930 | |
|
|
931 | $ctx->fmt_cb (sub { |
|
|
932 | my $str = $_[3]; |
|
|
933 | $str =~ s/\n(?=.)/\n+ /g; |
|
|
934 | |
|
|
935 | [$_[2], "($_[1][0]) $str"] |
|
|
936 | }); |
|
|
937 | |
|
|
938 | $facility ||= "user"; |
|
|
939 | |
876 | $ctx->log_cb (sub { |
940 | $ctx->log_cb (sub { |
877 | my $lvl = $_[2] < 9 ? $_[2] : 8; |
941 | my $lvl = $_[0][0] < 9 ? $_[0][0] : 8; |
878 | |
942 | |
879 | Sys::Syslog::syslog ($flags | ($lvl - 1), $_) |
943 | Sys::Syslog::syslog ("$facility|" . ($lvl - 1), $_) |
880 | for split /\n/, shift; |
944 | for split /\n/, $_[0][1]; |
881 | |
945 | |
882 | 0 |
946 | 0 |
883 | }); |
947 | }); |
884 | } |
948 | } |
885 | |
949 | |
… | |
… | |
904 | =cut |
968 | =cut |
905 | |
969 | |
906 | *log = \&AnyEvent::Log::_log; |
970 | *log = \&AnyEvent::Log::_log; |
907 | *logger = \&AnyEvent::Log::_logger; |
971 | *logger = \&AnyEvent::Log::_logger; |
908 | |
972 | |
|
|
973 | =back |
|
|
974 | |
|
|
975 | =cut |
|
|
976 | |
|
|
977 | package AnyEvent::Log; |
|
|
978 | |
|
|
979 | =head1 CONFIGURATION VIA $ENV{PERL_ANYEVENT_LOG} |
|
|
980 | |
|
|
981 | Logging can also be configured by setting the environment variable |
|
|
982 | C<PERL_ANYEVENT_LOG> (or C<AE_LOG>). |
|
|
983 | |
|
|
984 | The value consists of one or more logging context specifications separated |
|
|
985 | by C<:> or whitespace. Each logging specification in turn starts with a |
|
|
986 | context name, followed by C<=>, followed by zero or more comma-separated |
|
|
987 | configuration directives, here are some examples: |
|
|
988 | |
|
|
989 | # set default logging level |
|
|
990 | filter=warn |
|
|
991 | |
|
|
992 | # log to file instead of to stderr |
|
|
993 | log=file=/tmp/mylog |
|
|
994 | |
|
|
995 | # log to file in addition to stderr |
|
|
996 | log=+%file:%file=file=/tmp/mylog |
|
|
997 | |
|
|
998 | # enable debug log messages, log warnings and above to syslog |
|
|
999 | filter=debug:log=+%warnings:%warnings=warn,syslog=LOG_LOCAL0 |
|
|
1000 | |
|
|
1001 | # log trace messages (only) from AnyEvent::Debug to file |
|
|
1002 | AnyEvent::Debug=+%trace:%trace=only,trace,file=/tmp/tracelog |
|
|
1003 | |
|
|
1004 | A context name in the log specification can be any of the following: |
|
|
1005 | |
|
|
1006 | =over 4 |
|
|
1007 | |
|
|
1008 | =item C<collect>, C<filter>, C<log> |
|
|
1009 | |
|
|
1010 | Correspond to the three predefined C<$AnyEvent::Log::COLLECT>, |
|
|
1011 | C<AnyEvent::Log::FILTER> and C<$AnyEvent::Log::LOG> contexts. |
|
|
1012 | |
|
|
1013 | =item C<%name> |
|
|
1014 | |
|
|
1015 | Context names starting with a C<%> are anonymous contexts created when the |
|
|
1016 | name is first mentioned. The difference to package contexts is that by |
|
|
1017 | default they have no attached slaves. |
|
|
1018 | |
|
|
1019 | =item a perl package name |
|
|
1020 | |
|
|
1021 | Any other string references the logging context associated with the given |
|
|
1022 | Perl C<package>. In the unlikely case where you want to specify a package |
|
|
1023 | context that matches on of the other context name forms, you can add a |
|
|
1024 | C<::> to the package name to force interpretation as a package. |
|
|
1025 | |
|
|
1026 | =back |
|
|
1027 | |
|
|
1028 | The configuration specifications can be any number of the following: |
|
|
1029 | |
|
|
1030 | =over 4 |
|
|
1031 | |
|
|
1032 | =item C<stderr> |
|
|
1033 | |
|
|
1034 | Configures the context to use Perl's C<warn> function (which typically |
|
|
1035 | logs to C<STDERR>). Works like C<log_to_warn>. |
|
|
1036 | |
|
|
1037 | =item C<file=>I<path> |
|
|
1038 | |
|
|
1039 | Configures the context to log to a file with the given path. Works like |
|
|
1040 | C<log_to_file>. |
|
|
1041 | |
|
|
1042 | =item C<path=>I<path> |
|
|
1043 | |
|
|
1044 | Configures the context to log to a file with the given path. Works like |
|
|
1045 | C<log_to_path>. |
|
|
1046 | |
|
|
1047 | =item C<syslog> or C<syslog=>I<expr> |
|
|
1048 | |
|
|
1049 | Configures the context to log to syslog. If I<expr> is given, then it is |
|
|
1050 | evaluated in the L<Sys::Syslog> package, so you could use: |
|
|
1051 | |
|
|
1052 | log=syslog=LOG_LOCAL0 |
|
|
1053 | |
|
|
1054 | =item C<nolog> |
|
|
1055 | |
|
|
1056 | Configures the context to not log anything by itself, which is the |
|
|
1057 | default. Same as C<< $ctx->log_cb (undef) >>. |
|
|
1058 | |
|
|
1059 | =item C<0> or C<off> |
|
|
1060 | |
|
|
1061 | Sets the logging level of the context ot C<0>, i.e. all messages will be |
|
|
1062 | filtered out. |
|
|
1063 | |
|
|
1064 | =item C<all> |
|
|
1065 | |
|
|
1066 | Enables all logging levels, i.e. filtering will effectively be switched |
|
|
1067 | off (the default). |
|
|
1068 | |
|
|
1069 | =item C<only> |
|
|
1070 | |
|
|
1071 | Disables all logging levels, and changes the interpretation of following |
|
|
1072 | level specifications to enable the specified level only. |
|
|
1073 | |
|
|
1074 | Example: only enable debug messages for a context. |
|
|
1075 | |
|
|
1076 | context=only,debug |
|
|
1077 | |
|
|
1078 | =item C<except> |
|
|
1079 | |
|
|
1080 | Enables all logging levels, and changes the interpretation of following |
|
|
1081 | level specifications to disable that level. Rarely used. |
|
|
1082 | |
|
|
1083 | Example: enable all logging levels except fatal and trace (this is rather |
|
|
1084 | nonsensical). |
|
|
1085 | |
|
|
1086 | filter=exept,fatal,trace |
|
|
1087 | |
|
|
1088 | =item C<level> |
|
|
1089 | |
|
|
1090 | Enables all logging levels, and changes the interpretation of following |
|
|
1091 | level specifications to be "that level or any higher priority |
|
|
1092 | message". This is the default. |
|
|
1093 | |
|
|
1094 | Example: log anything at or above warn level. |
|
|
1095 | |
|
|
1096 | filter=warn |
|
|
1097 | |
|
|
1098 | # or, more verbose |
|
|
1099 | filter=only,level,warn |
|
|
1100 | |
|
|
1101 | =item C<1>..C<9> or a logging level name (C<error>, C<debug> etc.) |
|
|
1102 | |
|
|
1103 | A numeric loglevel or the name of a loglevel will be interpreted according |
|
|
1104 | to the most recent C<only>, C<except> or C<level> directive. By default, |
|
|
1105 | specifying a logging level enables that and any higher priority messages. |
|
|
1106 | |
|
|
1107 | =item C<+>I<context> |
|
|
1108 | |
|
|
1109 | Attaches the named context as slave to the context. |
|
|
1110 | |
|
|
1111 | =item C<+> |
|
|
1112 | |
|
|
1113 | A line C<+> detaches all contexts, i.e. clears the slave list from the |
|
|
1114 | context. Anonymous (C<%name>) contexts have no attached slaves by default, |
|
|
1115 | but package contexts have the parent context as slave by default. |
|
|
1116 | |
|
|
1117 | Example: log messages from My::Module to a file, do not send them to the |
|
|
1118 | default log collector. |
|
|
1119 | |
|
|
1120 | My::Module=+,file=/tmp/mymodulelog |
|
|
1121 | |
|
|
1122 | =back |
|
|
1123 | |
|
|
1124 | Any character can be escaped by prefixing it with a C<\> (backslash), as |
|
|
1125 | usual, so to log to a file containing a comma, colon, backslash and some |
|
|
1126 | spaces in the filename, you would do this: |
|
|
1127 | |
|
|
1128 | PERL_ANYEVENT_LOG='log=file=/some\ \:file\ with\,\ \\-escapes' |
|
|
1129 | |
|
|
1130 | Since whitespace (which includes newlines) is allowed, it is fine to |
|
|
1131 | specify multiple lines in C<PERL_ANYEVENT_LOG>, e.g.: |
|
|
1132 | |
|
|
1133 | PERL_ANYEVENT_LOG=" |
|
|
1134 | filter=warn |
|
|
1135 | AnyEvent::Debug=+%trace |
|
|
1136 | %trace=only,trace,+log |
|
|
1137 | " myprog |
|
|
1138 | |
|
|
1139 | Also, in the unlikely case when you want to concatenate specifications, |
|
|
1140 | use whitespace as separator, as C<::> will be interpreted as part of a |
|
|
1141 | module name, an empty spec with two separators: |
|
|
1142 | |
|
|
1143 | PERL_ANYEVENT_LOG="$PERL_ANYEVENT_LOG MyMod=debug" |
|
|
1144 | |
|
|
1145 | =cut |
|
|
1146 | |
|
|
1147 | for (my $spec = $ENV{PERL_ANYEVENT_LOG}) { |
|
|
1148 | my %anon; |
|
|
1149 | |
|
|
1150 | my $pkg = sub { |
|
|
1151 | $_[0] eq "log" ? $LOG |
|
|
1152 | : $_[0] eq "filter" ? $FILTER |
|
|
1153 | : $_[0] eq "collect" ? $COLLECT |
|
|
1154 | : $_[0] =~ /^%(.+)$/ ? ($anon{$1} ||= ctx undef) |
|
|
1155 | : $_[0] =~ /^(.*?)(?:::)?$/ ? ctx "$1" # egad :/ |
|
|
1156 | : die # never reached? |
|
|
1157 | }; |
|
|
1158 | |
|
|
1159 | /\G[[:space:]]+/gc; # skip initial whitespace |
|
|
1160 | |
|
|
1161 | while (/\G((?:[^:=[:space:]]+|::|\\.)+)=/gc) { |
|
|
1162 | my $ctx = $pkg->($1); |
|
|
1163 | my $level = "level"; |
|
|
1164 | |
|
|
1165 | while (/\G((?:[^,:[:space:]]+|::|\\.)+)/gc) { |
|
|
1166 | for ("$1") { |
|
|
1167 | if ($_ eq "stderr" ) { $ctx->log_to_warn; |
|
|
1168 | } elsif (/^file=(.+)/ ) { $ctx->log_to_file ("$1"); |
|
|
1169 | } elsif (/^path=(.+)/ ) { $ctx->log_to_path ("$1"); |
|
|
1170 | } elsif (/syslog(?:=(.*))?/ ) { require Sys::Syslog; $ctx->log_to_syslog ($1); |
|
|
1171 | } elsif ($_ eq "nolog" ) { $ctx->log_cb (undef); |
|
|
1172 | } elsif (/^\+(.+)$/ ) { $ctx->attach ($pkg->("$1")); |
|
|
1173 | } elsif ($_ eq "+" ) { $ctx->slaves; |
|
|
1174 | } elsif ($_ eq "off" or $_ eq "0") { $ctx->level (0); |
|
|
1175 | } elsif ($_ eq "all" ) { $ctx->level ("all"); |
|
|
1176 | } elsif ($_ eq "level" ) { $ctx->level ("all"); $level = "level"; |
|
|
1177 | } elsif ($_ eq "only" ) { $ctx->level ("off"); $level = "enable"; |
|
|
1178 | } elsif ($_ eq "except" ) { $ctx->level ("all"); $level = "disable"; |
|
|
1179 | } elsif (/^\d$/ ) { $ctx->$level ($_); |
|
|
1180 | } elsif (exists $STR2LEVEL{$_} ) { $ctx->$level ($_); |
|
|
1181 | } else { die "PERL_ANYEVENT_LOG ($spec): parse error at '$_'\n"; |
|
|
1182 | } |
|
|
1183 | } |
|
|
1184 | |
|
|
1185 | /\G,/gc or last; |
|
|
1186 | } |
|
|
1187 | |
|
|
1188 | /\G[:[:space:]]+/gc or last; |
|
|
1189 | } |
|
|
1190 | |
|
|
1191 | /\G[[:space:]]+/gc; # skip trailing whitespace |
|
|
1192 | |
|
|
1193 | if (/\G(.+)/g) { |
|
|
1194 | die "PERL_ANYEVENT_LOG ($spec): parse error at '$1'\n"; |
|
|
1195 | } |
|
|
1196 | } |
|
|
1197 | |
909 | 1; |
1198 | 1; |
910 | |
1199 | |
911 | =back |
|
|
912 | |
|
|
913 | =head1 EXAMPLES |
1200 | =head1 EXAMPLES |
914 | |
1201 | |
915 | This section shows some common configurations. |
1202 | This section shows some common configurations, both as code, and as |
|
|
1203 | C<PERL_ANYEVENT_LOG> string. |
916 | |
1204 | |
917 | =over 4 |
1205 | =over 4 |
918 | |
1206 | |
919 | =item Setting the global logging level. |
1207 | =item Setting the global logging level. |
920 | |
1208 | |
921 | Either put PERL_ANYEVENT_VERBOSE=<number> into your environment before |
1209 | Either put C<PERL_ANYEVENT_VERBOSE=><number> into your environment before |
922 | running your program, or modify the log level of the root context: |
1210 | running your program, use C<PERL_ANYEVENT_LOG> or modify the log level of |
|
|
1211 | the root context at runtime: |
923 | |
1212 | |
924 | PERL_ANYEVENT_VERBOSE=5 ./myprog |
1213 | PERL_ANYEVENT_VERBOSE=5 ./myprog |
925 | |
1214 | |
|
|
1215 | PERL_ANYEVENT_LOG=log=warn |
|
|
1216 | |
926 | $AnyEvent::Log::FILTER->level ("warn"); |
1217 | $AnyEvent::Log::FILTER->level ("warn"); |
927 | |
1218 | |
928 | =item Append all messages to a file instead of sending them to STDERR. |
1219 | =item Append all messages to a file instead of sending them to STDERR. |
929 | |
1220 | |
930 | This is affected by the global logging level. |
1221 | This is affected by the global logging level. |
931 | |
1222 | |
932 | $AnyEvent::Log::LOG->log_to_file ($path); (sub { |
1223 | $AnyEvent::Log::LOG->log_to_file ($path); |
|
|
1224 | |
|
|
1225 | PERL_ANYEVENT_LOG=log=file=/some/path |
933 | |
1226 | |
934 | =item Write all messages with priority C<error> and higher to a file. |
1227 | =item Write all messages with priority C<error> and higher to a file. |
935 | |
1228 | |
936 | This writes them only when the global logging level allows it, because |
1229 | This writes them only when the global logging level allows it, because |
937 | it is attached to the default context which is invoked I<after> global |
1230 | it is attached to the default context which is invoked I<after> global |
938 | filtering. |
1231 | filtering. |
939 | |
1232 | |
940 | $AnyEvent::Log::FILTER->attach |
1233 | $AnyEvent::Log::FILTER->attach |
941 | new AnyEvent::Log::Ctx log_to_file => $path); |
1234 | new AnyEvent::Log::Ctx log_to_file => $path); |
942 | |
1235 | |
|
|
1236 | PERL_ANYEVENT_LOG=filter=+%filelogger:%filelogger=file=/some/path |
|
|
1237 | |
943 | This writes them regardless of the global logging level, because it is |
1238 | This writes them regardless of the global logging level, because it is |
944 | attached to the toplevel context, which receives all messages I<before> |
1239 | attached to the toplevel context, which receives all messages I<before> |
945 | the global filtering. |
1240 | the global filtering. |
946 | |
1241 | |
947 | $AnyEvent::Log::COLLECT->attach ( |
1242 | $AnyEvent::Log::COLLECT->attach ( |
948 | new AnyEvent::Log::Ctx log_to_file => $path); |
1243 | new AnyEvent::Log::Ctx log_to_file => $path); |
949 | |
1244 | |
|
|
1245 | PERL_ANYEVENT_LOG=%filelogger=file=/some/path:collect=+%filelogger |
|
|
1246 | |
950 | In both cases, messages are still written to STDERR. |
1247 | In both cases, messages are still written to STDERR. |
951 | |
1248 | |
952 | =item Write trace messages (only) from L<AnyEvent::Debug> to the default logging target(s). |
1249 | =item Write trace messages (only) from L<AnyEvent::Debug> to the default logging target(s). |
953 | |
1250 | |
954 | Attach the C<$AnyEvent::Log::LOG> context to the C<AnyEvent::Debug> |
1251 | Attach the C<$AnyEvent::Log::LOG> context to the C<AnyEvent::Debug> |
955 | context - this simply circumvents the global filtering for trace messages. |
1252 | context - this simply circumvents the global filtering for trace messages. |
956 | |
1253 | |
957 | my $debug = AnyEvent::Debug->AnyEvent::Log::ctx; |
1254 | my $debug = AnyEvent::Debug->AnyEvent::Log::ctx; |
958 | $debug->attach ($AnyEvent::Log::LOG); |
1255 | $debug->attach ($AnyEvent::Log::LOG); |
|
|
1256 | |
|
|
1257 | PERL_ANYEVENT_LOG=AnyEvent::Debug=+log |
959 | |
1258 | |
960 | This of course works for any package, not just L<AnyEvent::Debug>, but |
1259 | This of course works for any package, not just L<AnyEvent::Debug>, but |
961 | assumes the log level for AnyEvent::Debug hasn't been changed from the |
1260 | assumes the log level for AnyEvent::Debug hasn't been changed from the |
962 | default. |
1261 | default. |
963 | |
1262 | |
… | |
… | |
967 | |
1266 | |
968 | Marc Lehmann <schmorp@schmorp.de> |
1267 | Marc Lehmann <schmorp@schmorp.de> |
969 | http://home.schmorp.de/ |
1268 | http://home.schmorp.de/ |
970 | |
1269 | |
971 | =cut |
1270 | =cut |
|
|
1271 | |