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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 trace => "going to call function abc"; |
11 | AE::log warn => "it's a bit too hot"; |
12 | AE::log debug => "the function returned 3"; |
12 | AE::log error => "the flag was false!"; |
13 | AE::log info => "file soandso successfully deleted"; |
13 | AE::log fatal => "the bit toggled! run!"; |
14 | AE::log note => "wanted to create config, but config was alraedy created"; |
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15 | AE::log warn => "couldn't delete the file"; |
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16 | AE::log error => "failed to retrieve data"; |
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17 | AE::log crit => "the battery temperature is too hot"; |
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18 | AE::log alert => "the battery died"; |
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19 | AE::log fatal => "no config found, cannot continue"; # never returns |
14 | |
20 | |
15 | # "complex" use |
21 | Log level overview: |
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22 | |
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23 | LVL NAME SYSLOG PERL NOTE |
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24 | 1 fatal emerg exit system unusable, aborts program! |
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25 | 2 alert failure in primary system |
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26 | 3 critical crit failure in backup system |
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27 | 4 error err die non-urgent program errors, a bug |
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28 | 5 warn warning possible problem, not necessarily error |
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29 | 6 note notice unusual conditions |
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30 | 7 info normal messages, no action required |
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31 | 8 debug debugging messages for development |
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32 | 9 trace copious tracing output |
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33 | |
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34 | "Complex" uses (for speed sensitive code, e.g. trace/debug messages): |
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35 | |
16 | use AnyEvent::Log; |
36 | use AnyEvent::Log; |
17 | |
37 | |
18 | my $tracer = AnyEvent::Log::logger trace => \$my $trace; |
38 | my $tracer = AnyEvent::Log::logger trace => \$my $trace; |
19 | |
39 | |
20 | $tracer->("i am here") if $trace; |
40 | $tracer->("i am here") if $trace; |
21 | $tracer->(sub { "lots of data: " . Dumper $self }) if $trace; |
41 | $tracer->(sub { "lots of data: " . Dumper $self }) if $trace; |
22 | |
42 | |
23 | # configuration |
43 | Configuration (also look at the EXAMPLES section): |
24 | |
44 | |
25 | # set logging for the current package to errors and higher only |
45 | # set logging for the current package to errors and higher only |
26 | AnyEvent::Log::ctx->level ("error"); |
46 | AnyEvent::Log::ctx->level ("error"); |
27 | |
47 | |
28 | # set logging globally to anything below debug |
48 | # set logging level to suppress anything below "notice" |
29 | $AnyEvent::Log::FILTER->level ("notice"); |
49 | $AnyEvent::Log::FILTER->level ("notice"); |
30 | |
50 | |
31 | # see also EXAMPLES, below |
51 | # send all critical and higher priority messages to syslog, |
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52 | # regardless of (most) other settings |
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53 | $AnyEvent::Log::COLLECT->attach (new AnyEvent::Log::Ctx |
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54 | level => "critical", |
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55 | log_to_syslog => "user", |
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56 | ); |
32 | |
57 | |
33 | =head1 DESCRIPTION |
58 | =head1 DESCRIPTION |
34 | |
59 | |
35 | This module implements a relatively simple "logging framework". It doesn't |
60 | This module implements a relatively simple "logging framework". It doesn't |
36 | attempt to be "the" logging solution or even "a" logging solution for |
61 | attempt to be "the" logging solution or even "a" logging solution for |
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42 | will be logged, unless you set C<PERL_ANYEVENT_VERBOSE> to a higher number |
67 | 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 |
68 | before starting your program, or change the logging level at runtime with |
44 | something like: |
69 | something like: |
45 | |
70 | |
46 | use AnyEvent::Log; |
71 | use AnyEvent::Log; |
47 | AnyEvent::Log::FILTER->level ("info"); |
72 | $AnyEvent::Log::FILTER->level ("info"); |
48 | |
73 | |
49 | The design goal behind this module was to keep it simple (and small), |
74 | 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 |
75 | 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 |
76 | extensive enough for the most common tasks, such as logging to multiple |
52 | targets, or being able to log into a database. |
77 | targets, or being able to log into a database. |
53 | |
78 | |
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79 | The module is also usable before AnyEvent itself is initialised, in which |
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80 | case some of the functionality might be reduced. |
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81 | |
54 | The amount of documentation might indicate otherwise, but the module is |
82 | The amount of documentation might indicate otherwise, but the runtime part |
55 | still just below 300 lines of code. |
83 | of the module is still just below 300 lines of code. |
56 | |
84 | |
57 | =head1 LOGGING LEVELS |
85 | =head1 LOGGING LEVELS |
58 | |
86 | |
59 | Logging levels in this module range from C<1> (highest priority) to C<9> |
87 | 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 |
88 | (lowest priority). Note that the lowest numerical value is the highest |
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62 | numerical value". |
90 | numerical value". |
63 | |
91 | |
64 | Instead of specifying levels by name you can also specify them by aliases: |
92 | Instead of specifying levels by name you can also specify them by aliases: |
65 | |
93 | |
66 | LVL NAME SYSLOG PERL NOTE |
94 | LVL NAME SYSLOG PERL NOTE |
67 | 1 fatal emerg exit aborts program! |
95 | 1 fatal emerg exit system unusable, aborts program! |
68 | 2 alert |
96 | 2 alert failure in primary system |
69 | 3 critical crit |
97 | 3 critical crit failure in backup system |
70 | 4 error err die |
98 | 4 error err die non-urgent program errors, a bug |
71 | 5 warn warning |
99 | 5 warn warning possible problem, not necessarily error |
72 | 6 note notice |
100 | 6 note notice unusual conditions |
73 | 7 info |
101 | 7 info normal messages, no action required |
74 | 8 debug |
102 | 8 debug debugging messages for development |
75 | 9 trace |
103 | 9 trace copious tracing output |
76 | |
104 | |
77 | As you can see, some logging levels have multiple aliases - the first one |
105 | As you can see, some logging levels have multiple aliases - the first one |
78 | is the "official" name, the second one the "syslog" name (if it differs) |
106 | is the "official" name, the second one the "syslog" name (if it differs) |
79 | and the third one the "perl" name, suggesting that you log C<die> messages |
107 | and the third one the "perl" name, suggesting (only!) that you log C<die> |
80 | at C<error> priority. |
108 | messages at C<error> priority. The NOTE column tries to provide some |
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109 | rationale on how to chose a logging level. |
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110 | |
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111 | As a rough guideline, levels 1..3 are primarily meant for users of |
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112 | the program (admins, staff), and are the only logged to STDERR by |
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113 | default. Levels 4..6 are meant for users and developers alike, while |
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114 | levels 7..9 are usually meant for developers. |
81 | |
115 | |
82 | You can normally only log a single message at highest priority level |
116 | You can normally only log a single message at highest priority level |
83 | (C<1>, C<fatal>), because logging a fatal message will also quit the |
117 | (C<1>, C<fatal>), because logging a fatal message will also quit the |
84 | program - so use it sparingly :) |
118 | program - so use it sparingly :) |
85 | |
119 | |
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101 | |
135 | |
102 | use Carp (); |
136 | use Carp (); |
103 | use POSIX (); |
137 | use POSIX (); |
104 | |
138 | |
105 | use AnyEvent (); BEGIN { AnyEvent::common_sense } |
139 | use AnyEvent (); BEGIN { AnyEvent::common_sense } |
106 | use AnyEvent::Util (); |
140 | #use AnyEvent::Util (); need to load this in a delayed fashion, as it uses AE::log |
107 | |
141 | |
108 | our $VERSION = $AnyEvent::VERSION; |
142 | our $VERSION = $AnyEvent::VERSION; |
109 | |
143 | |
110 | our ($COLLECT, $FILTER, $LOG); |
144 | our ($COLLECT, $FILTER, $LOG); |
111 | |
145 | |
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138 | $ctx |
172 | $ctx |
139 | } |
173 | } |
140 | |
174 | |
141 | =item AnyEvent::Log::log $level, $msg[, @args] |
175 | =item AnyEvent::Log::log $level, $msg[, @args] |
142 | |
176 | |
143 | Requests logging of the given C<$msg> with the given log level. |
177 | Requests logging of the given C<$msg> with the given log level, and |
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178 | returns true if the message was logged I<somewhere>. |
144 | |
179 | |
145 | For C<fatal> log levels, the program will abort. |
180 | For loglevel C<fatal>, the program will abort. |
146 | |
181 | |
147 | If only a C<$msg> is given, it is logged as-is. With extra C<@args>, the |
182 | 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. |
183 | C<$msg> is interpreted as an sprintf format string. |
149 | |
184 | |
150 | The C<$msg> should not end with C<\n>, but may if that is convenient for |
185 | The C<$msg> should not end with C<\n>, but may if that is convenient for |
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154 | supposed to return the message. It will be called only then the message |
189 | 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 |
190 | actually gets logged, which is useful if it is costly to create the |
156 | message in the first place. |
191 | message in the first place. |
157 | |
192 | |
158 | Whether the given message will be logged depends on the maximum log level |
193 | Whether the given message will be logged depends on the maximum log level |
159 | and the caller's package. |
194 | and the caller's package. The return value can be used to ensure that |
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195 | messages or not "lost" - for example, when L<AnyEvent::Debug> detects a |
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196 | runtime error it tries to log it at C<die> level, but if that message is |
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197 | lost it simply uses warn. |
160 | |
198 | |
161 | Note that you can (and should) call this function as C<AnyEvent::log> or |
199 | 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 |
200 | 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 |
201 | need any additional functionality), as those functions will load the |
164 | logging module on demand only. They are also much shorter to write. |
202 | logging module on demand only. They are also much shorter to write. |
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192 | info => 7, |
230 | info => 7, |
193 | debug => 8, |
231 | debug => 8, |
194 | trace => 9, |
232 | trace => 9, |
195 | ); |
233 | ); |
196 | |
234 | |
197 | sub now () { time } |
235 | our $TIME_EXACT; |
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236 | |
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237 | sub exact_time($) { |
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238 | $TIME_EXACT = shift; |
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239 | *_ts = $AnyEvent::MODEL |
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240 | ? $TIME_EXACT ? \&AE::now : \&AE::time |
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241 | : sub () { $TIME_EXACT ? do { require Time::HiRes; Time::HiRes::time () } : time }; |
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242 | } |
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243 | |
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244 | BEGIN { |
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245 | exact_time 0; |
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246 | } |
198 | |
247 | |
199 | AnyEvent::post_detect { |
248 | AnyEvent::post_detect { |
200 | *now = \&AE::now; |
249 | exact_time $TIME_EXACT; |
201 | }; |
250 | }; |
202 | |
251 | |
203 | our @LEVEL2STR = qw(0 fatal alert crit error warn note info debug trace); |
252 | our @LEVEL2STR = qw(0 fatal alert crit error warn note info debug trace); |
204 | |
253 | |
205 | # time, ctx, level, msg |
254 | # time, ctx, level, msg |
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215 | } |
264 | } |
216 | |
265 | |
217 | join "", @res |
266 | join "", @res |
218 | } |
267 | } |
219 | |
268 | |
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269 | sub fatal_exit() { |
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270 | exit 1; |
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271 | } |
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272 | |
220 | sub _log { |
273 | sub _log { |
221 | my ($ctx, $level, $format, @args) = @_; |
274 | my ($ctx, $level, $format, @args) = @_; |
222 | |
275 | |
223 | $level = $level > 0 && $level <= 9 |
276 | $level = $level > 0 && $level <= 9 |
224 | ? $level+0 |
277 | ? $level+0 |
225 | : $STR2LEVEL{$level} || Carp::croak "$level: not a valid logging level, caught"; |
278 | : $STR2LEVEL{$level} || Carp::croak "$level: not a valid logging level, caught"; |
226 | |
279 | |
227 | my $mask = 1 << $level; |
280 | my $mask = 1 << $level; |
228 | |
281 | |
229 | my (%seen, @ctx, $now, $fmt); |
282 | my ($success, %seen, @ctx, $now, $fmt); |
230 | |
283 | |
231 | do |
284 | do |
232 | { |
285 | { |
233 | # skip if masked |
286 | # skip if masked |
234 | if ($ctx->[1] & $mask && !$seen{$ctx+0}++) { |
287 | if ($ctx->[1] & $mask && !$seen{$ctx+0}++) { |
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238 | # now get raw message, unless we have it already |
291 | # now get raw message, unless we have it already |
239 | unless ($now) { |
292 | unless ($now) { |
240 | $format = $format->() if ref $format; |
293 | $format = $format->() if ref $format; |
241 | $format = sprintf $format, @args if @args; |
294 | $format = sprintf $format, @args if @args; |
242 | $format =~ s/\n$//; |
295 | $format =~ s/\n$//; |
243 | $now = AE::now; |
296 | $now = _ts; |
244 | }; |
297 | }; |
245 | |
298 | |
246 | # format msg |
299 | # format msg |
247 | my $str = $ctx->[4] |
300 | my $str = $ctx->[4] |
248 | ? $ctx->[4]($now, $_[0], $level, $format) |
301 | ? $ctx->[4]($now, $_[0], $level, $format) |
249 | : ($fmt ||= _format $now, $_[0], $level, $format); |
302 | : ($fmt ||= _format $now, $_[0], $level, $format); |
250 | |
303 | |
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304 | $success = 1; |
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305 | |
251 | $ctx->[3]($str, $_[0], $level) |
306 | $ctx->[3]($str) |
252 | or push @ctx, values %{ $ctx->[2] }; # not consumed - propagate |
307 | or push @ctx, values %{ $ctx->[2] }; # not consumed - propagate |
253 | } else { |
308 | } else { |
254 | push @ctx, values %{ $ctx->[2] }; # not masked - propagate |
309 | push @ctx, values %{ $ctx->[2] }; # not masked - propagate |
255 | } |
310 | } |
256 | } |
311 | } |
257 | } |
312 | } |
258 | while $ctx = pop @ctx; |
313 | while $ctx = pop @ctx; |
259 | |
314 | |
260 | exit 1 if $level <= 1; |
315 | fatal_exit if $level <= 1; |
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316 | |
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317 | $success |
261 | } |
318 | } |
262 | |
319 | |
263 | sub log($$;@) { |
320 | sub log($$;@) { |
264 | _log |
321 | _log |
265 | $CTX{ (caller)[0] } ||= _pkg_ctx +(caller)[0], |
322 | $CTX{ (caller)[0] } ||= _pkg_ctx +(caller)[0], |
266 | @_; |
323 | @_; |
267 | } |
324 | } |
268 | |
325 | |
269 | *AnyEvent::log = *AE::log = \&log; |
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270 | |
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271 | =item $logger = AnyEvent::Log::logger $level[, \$enabled] |
326 | =item $logger = AnyEvent::Log::logger $level[, \$enabled] |
272 | |
327 | |
273 | Creates a code reference that, when called, acts as if the |
328 | Creates a code reference that, when called, acts as if the |
274 | C<AnyEvent::Log::log> function was called at this point with the givne |
329 | C<AnyEvent::Log::log> function was called at this point with the given |
275 | level. C<$logger> is passed a C<$msg> and optional C<@args>, just as with |
330 | level. C<$logger> is passed a C<$msg> and optional C<@args>, just as with |
276 | the C<AnyEvent::Log::log> function: |
331 | the C<AnyEvent::Log::log> function: |
277 | |
332 | |
278 | my $debug_log = AnyEvent::Log::logger "debug"; |
333 | my $debug_log = AnyEvent::Log::logger "debug"; |
279 | |
334 | |
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339 | |
394 | |
340 | $LOGGER{$logger+0} = $logger; |
395 | $LOGGER{$logger+0} = $logger; |
341 | |
396 | |
342 | _reassess $logger+0; |
397 | _reassess $logger+0; |
343 | |
398 | |
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399 | require AnyEvent::Util unless $AnyEvent::Util::VERSION; |
344 | my $guard = AnyEvent::Util::guard { |
400 | my $guard = AnyEvent::Util::guard (sub { |
345 | # "clean up" |
401 | # "clean up" |
346 | delete $LOGGER{$logger+0}; |
402 | delete $LOGGER{$logger+0}; |
347 | }; |
403 | }); |
348 | |
404 | |
349 | sub { |
405 | sub { |
350 | $guard if 0; # keep guard alive, but don't cause runtime overhead |
406 | $guard if 0; # keep guard alive, but don't cause runtime overhead |
351 | |
407 | |
352 | _log $ctx, $level, @_ |
408 | _log $ctx, $level, @_ |
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357 | sub logger($;$) { |
413 | sub logger($;$) { |
358 | _logger |
414 | _logger |
359 | $CTX{ (caller)[0] } ||= _pkg_ctx +(caller)[0], |
415 | $CTX{ (caller)[0] } ||= _pkg_ctx +(caller)[0], |
360 | @_ |
416 | @_ |
361 | } |
417 | } |
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418 | |
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419 | =item AnyEvent::Log::exact_time $on |
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420 | |
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421 | By default, C<AnyEvent::Log> will use C<AE::now>, i.e. the cached |
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422 | eventloop time, for the log timestamps. After calling this function with a |
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423 | true value it will instead resort to C<AE::time>, i.e. fetch the current |
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424 | time on each log message. This only makes a difference for event loops |
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425 | that actually cache the time (such as L<EV> or L<AnyEvent::Loop>). |
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426 | |
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427 | This setting can be changed at any time by calling this function. |
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428 | |
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429 | Since C<AnyEvent::Log> has to work even before the L<AnyEvent> has been |
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430 | initialised, this switch will also decide whether to use C<CORE::time> or |
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431 | C<Time::HiRes::time> when logging a message before L<AnyEvent> becomes |
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432 | available. |
362 | |
433 | |
363 | =back |
434 | =back |
364 | |
435 | |
365 | =head1 LOGGING CONTEXTS |
436 | =head1 LOGGING CONTEXTS |
366 | |
437 | |
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486 | This can be used to implement config-file (re-)loading: before loading a |
557 | This can be used to implement config-file (re-)loading: before loading a |
487 | configuration, reset all contexts. |
558 | configuration, reset all contexts. |
488 | |
559 | |
489 | =cut |
560 | =cut |
490 | |
561 | |
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562 | our $ORIG_VERBOSE = $AnyEvent::VERBOSE; |
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563 | $AnyEvent::VERBOSE = 9; |
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564 | |
491 | sub reset { |
565 | sub reset { |
492 | # hard to kill complex data structures |
566 | # hard to kill complex data structures |
493 | # we "recreate" all package loggers and reset the hierarchy |
567 | # we "recreate" all package loggers and reset the hierarchy |
494 | while (my ($k, $v) = each %CTX) { |
568 | while (my ($k, $v) = each %CTX) { |
495 | @$v = ($k, (1 << 10) - 1 - 1, { }); |
569 | @$v = ($k, (1 << 10) - 1 - 1, { }); |
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498 | } |
572 | } |
499 | |
573 | |
500 | @$_ = ($_->[0], (1 << 10) - 1 - 1) |
574 | @$_ = ($_->[0], (1 << 10) - 1 - 1) |
501 | for $LOG, $FILTER, $COLLECT; |
575 | for $LOG, $FILTER, $COLLECT; |
502 | |
576 | |
503 | $LOG->slaves; |
577 | #$LOG->slaves; |
504 | $LOG->title ('$AnyEvent::Log::LOG'); |
578 | $LOG->title ('$AnyEvent::Log::LOG'); |
505 | $LOG->log_cb (sub { |
579 | $LOG->log_to_warn; |
506 | warn shift; |
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507 | 0 |
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508 | }); |
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509 | |
580 | |
510 | $FILTER->slaves ($LOG); |
581 | $FILTER->slaves ($LOG); |
511 | $FILTER->title ('$AnyEvent::Log::FILTER'); |
582 | $FILTER->title ('$AnyEvent::Log::FILTER'); |
512 | $FILTER->level ($AnyEvent::VERBOSE); |
583 | $FILTER->level ($ORIG_VERBOSE); |
513 | |
584 | |
514 | $COLLECT->slaves ($FILTER); |
585 | $COLLECT->slaves ($FILTER); |
515 | $COLLECT->title ('$AnyEvent::Log::COLLECT'); |
586 | $COLLECT->title ('$AnyEvent::Log::COLLECT'); |
516 | |
587 | |
517 | _reassess; |
588 | _reassess; |
518 | } |
589 | } |
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590 | |
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591 | # override AE::log/logger |
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592 | *AnyEvent::log = *AE::log = \&log; |
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593 | *AnyEvent::logger = *AE::logger = \&logger; |
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594 | |
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595 | # convert AnyEvent loggers to AnyEvent::Log loggers |
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596 | $_->[0] = ctx $_->[0] # convert "pkg" to "ctx" |
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597 | for values %LOGGER; |
519 | |
598 | |
520 | # create the default logger contexts |
599 | # create the default logger contexts |
521 | $LOG = ctx undef; |
600 | $LOG = ctx undef; |
522 | $FILTER = ctx undef; |
601 | $FILTER = ctx undef; |
523 | $COLLECT = ctx undef; |
602 | $COLLECT = ctx undef; |
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734 | the logging (which consists of formatting the message and printing it or |
813 | the logging (which consists of formatting the message and printing it or |
735 | whatever it wants to do with it). |
814 | whatever it wants to do with it). |
736 | |
815 | |
737 | =over 4 |
816 | =over 4 |
738 | |
817 | |
739 | =item $ctx->log_cb ($cb->($str, $orig_ctx, $level)) |
818 | =item $ctx->log_cb ($cb->($str) |
740 | |
819 | |
741 | Replaces the logging callback on the context (C<undef> disables the |
820 | Replaces the logging callback on the context (C<undef> disables the |
742 | logging callback). |
821 | logging callback). |
743 | |
822 | |
744 | The logging callback is responsible for handling formatted log messages |
823 | The logging callback is responsible for handling formatted log messages |
745 | (see C<fmt_cb> below) - normally simple text strings that end with a |
824 | (see C<fmt_cb> below) - normally simple text strings that end with a |
746 | newline (and are possibly multiline themselves). In addition to the |
825 | newline (and are possibly multiline themselves). |
747 | message, which is often the only argument you need to look at, it is |
|
|
748 | passed the numeric log level and originating context. |
|
|
749 | |
826 | |
750 | It also has to return true iff it has consumed the log message, and false |
827 | 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 |
828 | 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. |
829 | slave context. When in doubt, return C<0> from your logging callback. |
753 | |
830 | |
… | |
… | |
764 | "trace". The messages will still be generated, though, which can slow down |
841 | "trace". The messages will still be generated, though, which can slow down |
765 | your program. |
842 | your program. |
766 | |
843 | |
767 | $ctx->levels ("debug", "trace"); |
844 | $ctx->levels ("debug", "trace"); |
768 | $ctx->log_cb (sub { 1 }); # do not log, but eat debug and trace messages |
845 | $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. |
|
|
773 | |
|
|
774 | =item $ctx->log_to_path ($path) |
|
|
775 | |
|
|
776 | Same as C<< ->log_to_file >>, but opens the file for each message. This |
|
|
777 | is much slower, but allows you to change/move/rename/delete the file at |
|
|
778 | basically any time. |
|
|
779 | |
|
|
780 | =item $ctx->log_to_syslog ([$log_flags]) |
|
|
781 | |
|
|
782 | Logs all messages via L<Sys::Syslog>, mapping C<trace> to C<debug> and all |
|
|
783 | the others in the obvious way. If specified, then the C<$log_flags> are |
|
|
784 | simply or'ed onto the priority argument and can contain any C<LOG_xxx> |
|
|
785 | flags valid for Sys::Syslog::syslog, except for the priority levels. |
|
|
786 | |
|
|
787 | Note that the default logging format includes a verbose timestamp, which |
|
|
788 | is not so suited for syslog, so a simpler C<fmt_cb> might be useful: |
|
|
789 | |
|
|
790 | $ctx->log_to_syslog; |
|
|
791 | $ctx->fmt_cb (sub { "($_[1][0]) $_[3]" }); |
|
|
792 | |
846 | |
793 | =item $ctx->fmt_cb ($fmt_cb->($timestamp, $orig_ctx, $level, $message)) |
847 | =item $ctx->fmt_cb ($fmt_cb->($timestamp, $orig_ctx, $level, $message)) |
794 | |
848 | |
795 | Replaces the formatting callback on the context (C<undef> restores the |
849 | Replaces the formatting callback on the context (C<undef> restores the |
796 | default formatter). |
850 | default formatter). |
… | |
… | |
799 | logging context, the (numeric) logging level and the raw message string |
853 | logging context, the (numeric) logging level and the raw message string |
800 | and needs to return a formatted log message. In most cases this will be a |
854 | and needs to return a formatted log message. In most cases this will be a |
801 | string, but it could just as well be an array reference that just stores |
855 | string, but it could just as well be an array reference that just stores |
802 | the values. |
856 | the values. |
803 | |
857 | |
804 | If, for some reaosn, you want to use C<caller> to find out more baout the |
858 | If, for some reason, you want to use C<caller> to find out more baout the |
805 | logger then you should walk up the call stack until you are no longer |
859 | logger then you should walk up the call stack until you are no longer |
806 | inside the C<AnyEvent::Log> package. |
860 | inside the C<AnyEvent::Log> package. |
807 | |
861 | |
808 | Example: format just the raw message, with numeric log level in angle |
862 | Example: format just the raw message, with numeric log level in angle |
809 | brackets. |
863 | brackets. |
… | |
… | |
828 | "$msg->[3]"; |
882 | "$msg->[3]"; |
829 | |
883 | |
830 | 0 |
884 | 0 |
831 | }); |
885 | }); |
832 | |
886 | |
|
|
887 | =item $ctx->log_to_warn |
|
|
888 | |
|
|
889 | Sets the C<log_cb> to simply use C<CORE::warn> to report any messages |
|
|
890 | (usually this logs to STDERR). |
|
|
891 | |
|
|
892 | =item $ctx->log_to_file ($path) |
|
|
893 | |
|
|
894 | Sets the C<log_cb> to log to a file (by appending), unbuffered. |
|
|
895 | |
|
|
896 | =item $ctx->log_to_path ($path) |
|
|
897 | |
|
|
898 | Same as C<< ->log_to_file >>, but opens the file for each message. This |
|
|
899 | is much slower, but allows you to change/move/rename/delete the file at |
|
|
900 | basically any time. |
|
|
901 | |
|
|
902 | Needless(?) to say, if you do not want to be bitten by some evil person |
|
|
903 | calling C<chdir>, the path should be absolute. Doesn't help with |
|
|
904 | C<chroot>, but hey... |
|
|
905 | |
|
|
906 | =item $ctx->log_to_syslog ([$facility]) |
|
|
907 | |
|
|
908 | Logs all messages via L<Sys::Syslog>, mapping C<trace> to C<debug> and |
|
|
909 | all the others in the obvious way. If specified, then the C<$facility> is |
|
|
910 | used as the facility (C<user>, C<auth>, C<local0> and so on). The default |
|
|
911 | facility is C<user>. |
|
|
912 | |
|
|
913 | Note that this function also sets a C<fmt_cb> - the logging part requires |
|
|
914 | an array reference with [$level, $str] as input. |
|
|
915 | |
833 | =cut |
916 | =cut |
834 | |
917 | |
835 | sub log_cb { |
918 | sub log_cb { |
836 | my ($ctx, $cb) = @_; |
919 | my ($ctx, $cb) = @_; |
837 | |
920 | |
… | |
… | |
840 | |
923 | |
841 | sub fmt_cb { |
924 | sub fmt_cb { |
842 | my ($ctx, $cb) = @_; |
925 | my ($ctx, $cb) = @_; |
843 | |
926 | |
844 | $ctx->[4] = $cb; |
927 | $ctx->[4] = $cb; |
|
|
928 | } |
|
|
929 | |
|
|
930 | sub log_to_warn { |
|
|
931 | my ($ctx, $path) = @_; |
|
|
932 | |
|
|
933 | $ctx->log_cb (sub { |
|
|
934 | warn shift; |
|
|
935 | 0 |
|
|
936 | }); |
845 | } |
937 | } |
846 | |
938 | |
847 | sub log_to_file { |
939 | sub log_to_file { |
848 | my ($ctx, $path) = @_; |
940 | my ($ctx, $path) = @_; |
849 | |
941 | |
… | |
… | |
854 | syswrite $fh, shift; |
946 | syswrite $fh, shift; |
855 | 0 |
947 | 0 |
856 | }); |
948 | }); |
857 | } |
949 | } |
858 | |
950 | |
859 | sub log_to_file { |
951 | sub log_to_path { |
860 | my ($ctx, $path) = @_; |
952 | my ($ctx, $path) = @_; |
861 | |
953 | |
862 | $ctx->log_cb (sub { |
954 | $ctx->log_cb (sub { |
863 | open my $fh, ">>", $path |
955 | open my $fh, ">>", $path |
864 | or die "$path: $!"; |
956 | or die "$path: $!"; |
… | |
… | |
867 | 0 |
959 | 0 |
868 | }); |
960 | }); |
869 | } |
961 | } |
870 | |
962 | |
871 | sub log_to_syslog { |
963 | sub log_to_syslog { |
872 | my ($ctx, $flags) = @_; |
964 | my ($ctx, $facility) = @_; |
873 | |
965 | |
874 | require Sys::Syslog; |
966 | require Sys::Syslog; |
875 | |
967 | |
|
|
968 | $ctx->fmt_cb (sub { |
|
|
969 | my $str = $_[3]; |
|
|
970 | $str =~ s/\n(?=.)/\n+ /g; |
|
|
971 | |
|
|
972 | [$_[2], "($_[1][0]) $str"] |
|
|
973 | }); |
|
|
974 | |
|
|
975 | $facility ||= "user"; |
|
|
976 | |
876 | $ctx->log_cb (sub { |
977 | $ctx->log_cb (sub { |
877 | my $lvl = $_[2] < 9 ? $_[2] : 8; |
978 | my $lvl = $_[0][0] < 9 ? $_[0][0] : 8; |
878 | |
979 | |
879 | Sys::Syslog::syslog ($flags | ($lvl - 1), $_) |
980 | Sys::Syslog::syslog ("$facility|" . ($lvl - 1), $_) |
880 | for split /\n/, shift; |
981 | for split /\n/, $_[0][1]; |
881 | |
982 | |
882 | 0 |
983 | 0 |
883 | }); |
984 | }); |
884 | } |
985 | } |
885 | |
986 | |
… | |
… | |
904 | =cut |
1005 | =cut |
905 | |
1006 | |
906 | *log = \&AnyEvent::Log::_log; |
1007 | *log = \&AnyEvent::Log::_log; |
907 | *logger = \&AnyEvent::Log::_logger; |
1008 | *logger = \&AnyEvent::Log::_logger; |
908 | |
1009 | |
|
|
1010 | =back |
|
|
1011 | |
|
|
1012 | =cut |
|
|
1013 | |
|
|
1014 | package AnyEvent::Log; |
|
|
1015 | |
|
|
1016 | =head1 CONFIGURATION VIA $ENV{PERL_ANYEVENT_LOG} |
|
|
1017 | |
|
|
1018 | Logging can also be configured by setting the environment variable |
|
|
1019 | C<PERL_ANYEVENT_LOG> (or C<AE_LOG>). |
|
|
1020 | |
|
|
1021 | The value consists of one or more logging context specifications separated |
|
|
1022 | by C<:> or whitespace. Each logging specification in turn starts with a |
|
|
1023 | context name, followed by C<=>, followed by zero or more comma-separated |
|
|
1024 | configuration directives, here are some examples: |
|
|
1025 | |
|
|
1026 | # set default logging level |
|
|
1027 | filter=warn |
|
|
1028 | |
|
|
1029 | # log to file instead of to stderr |
|
|
1030 | log=file=/tmp/mylog |
|
|
1031 | |
|
|
1032 | # log to file in addition to stderr |
|
|
1033 | log=+%file:%file=file=/tmp/mylog |
|
|
1034 | |
|
|
1035 | # enable debug log messages, log warnings and above to syslog |
|
|
1036 | filter=debug:log=+%warnings:%warnings=warn,syslog=LOG_LOCAL0 |
|
|
1037 | |
|
|
1038 | # log trace messages (only) from AnyEvent::Debug to file |
|
|
1039 | AnyEvent::Debug=+%trace:%trace=only,trace,file=/tmp/tracelog |
|
|
1040 | |
|
|
1041 | A context name in the log specification can be any of the following: |
|
|
1042 | |
|
|
1043 | =over 4 |
|
|
1044 | |
|
|
1045 | =item C<collect>, C<filter>, C<log> |
|
|
1046 | |
|
|
1047 | Correspond to the three predefined C<$AnyEvent::Log::COLLECT>, |
|
|
1048 | C<AnyEvent::Log::FILTER> and C<$AnyEvent::Log::LOG> contexts. |
|
|
1049 | |
|
|
1050 | =item C<%name> |
|
|
1051 | |
|
|
1052 | Context names starting with a C<%> are anonymous contexts created when the |
|
|
1053 | name is first mentioned. The difference to package contexts is that by |
|
|
1054 | default they have no attached slaves. |
|
|
1055 | |
|
|
1056 | =item a perl package name |
|
|
1057 | |
|
|
1058 | Any other string references the logging context associated with the given |
|
|
1059 | Perl C<package>. In the unlikely case where you want to specify a package |
|
|
1060 | context that matches on of the other context name forms, you can add a |
|
|
1061 | C<::> to the package name to force interpretation as a package. |
|
|
1062 | |
|
|
1063 | =back |
|
|
1064 | |
|
|
1065 | The configuration specifications can be any number of the following: |
|
|
1066 | |
|
|
1067 | =over 4 |
|
|
1068 | |
|
|
1069 | =item C<stderr> |
|
|
1070 | |
|
|
1071 | Configures the context to use Perl's C<warn> function (which typically |
|
|
1072 | logs to C<STDERR>). Works like C<log_to_warn>. |
|
|
1073 | |
|
|
1074 | =item C<file=>I<path> |
|
|
1075 | |
|
|
1076 | Configures the context to log to a file with the given path. Works like |
|
|
1077 | C<log_to_file>. |
|
|
1078 | |
|
|
1079 | =item C<path=>I<path> |
|
|
1080 | |
|
|
1081 | Configures the context to log to a file with the given path. Works like |
|
|
1082 | C<log_to_path>. |
|
|
1083 | |
|
|
1084 | =item C<syslog> or C<syslog=>I<expr> |
|
|
1085 | |
|
|
1086 | Configures the context to log to syslog. If I<expr> is given, then it is |
|
|
1087 | evaluated in the L<Sys::Syslog> package, so you could use: |
|
|
1088 | |
|
|
1089 | log=syslog=LOG_LOCAL0 |
|
|
1090 | |
|
|
1091 | =item C<nolog> |
|
|
1092 | |
|
|
1093 | Configures the context to not log anything by itself, which is the |
|
|
1094 | default. Same as C<< $ctx->log_cb (undef) >>. |
|
|
1095 | |
|
|
1096 | =item C<0> or C<off> |
|
|
1097 | |
|
|
1098 | Sets the logging level of the context ot C<0>, i.e. all messages will be |
|
|
1099 | filtered out. |
|
|
1100 | |
|
|
1101 | =item C<all> |
|
|
1102 | |
|
|
1103 | Enables all logging levels, i.e. filtering will effectively be switched |
|
|
1104 | off (the default). |
|
|
1105 | |
|
|
1106 | =item C<only> |
|
|
1107 | |
|
|
1108 | Disables all logging levels, and changes the interpretation of following |
|
|
1109 | level specifications to enable the specified level only. |
|
|
1110 | |
|
|
1111 | Example: only enable debug messages for a context. |
|
|
1112 | |
|
|
1113 | context=only,debug |
|
|
1114 | |
|
|
1115 | =item C<except> |
|
|
1116 | |
|
|
1117 | Enables all logging levels, and changes the interpretation of following |
|
|
1118 | level specifications to disable that level. Rarely used. |
|
|
1119 | |
|
|
1120 | Example: enable all logging levels except fatal and trace (this is rather |
|
|
1121 | nonsensical). |
|
|
1122 | |
|
|
1123 | filter=exept,fatal,trace |
|
|
1124 | |
|
|
1125 | =item C<level> |
|
|
1126 | |
|
|
1127 | Enables all logging levels, and changes the interpretation of following |
|
|
1128 | level specifications to be "that level or any higher priority |
|
|
1129 | message". This is the default. |
|
|
1130 | |
|
|
1131 | Example: log anything at or above warn level. |
|
|
1132 | |
|
|
1133 | filter=warn |
|
|
1134 | |
|
|
1135 | # or, more verbose |
|
|
1136 | filter=only,level,warn |
|
|
1137 | |
|
|
1138 | =item C<1>..C<9> or a logging level name (C<error>, C<debug> etc.) |
|
|
1139 | |
|
|
1140 | A numeric loglevel or the name of a loglevel will be interpreted according |
|
|
1141 | to the most recent C<only>, C<except> or C<level> directive. By default, |
|
|
1142 | specifying a logging level enables that and any higher priority messages. |
|
|
1143 | |
|
|
1144 | =item C<+>I<context> |
|
|
1145 | |
|
|
1146 | Attaches the named context as slave to the context. |
|
|
1147 | |
|
|
1148 | =item C<+> |
|
|
1149 | |
|
|
1150 | A line C<+> detaches all contexts, i.e. clears the slave list from the |
|
|
1151 | context. Anonymous (C<%name>) contexts have no attached slaves by default, |
|
|
1152 | but package contexts have the parent context as slave by default. |
|
|
1153 | |
|
|
1154 | Example: log messages from My::Module to a file, do not send them to the |
|
|
1155 | default log collector. |
|
|
1156 | |
|
|
1157 | My::Module=+,file=/tmp/mymodulelog |
|
|
1158 | |
|
|
1159 | =back |
|
|
1160 | |
|
|
1161 | Any character can be escaped by prefixing it with a C<\> (backslash), as |
|
|
1162 | usual, so to log to a file containing a comma, colon, backslash and some |
|
|
1163 | spaces in the filename, you would do this: |
|
|
1164 | |
|
|
1165 | PERL_ANYEVENT_LOG='log=file=/some\ \:file\ with\,\ \\-escapes' |
|
|
1166 | |
|
|
1167 | Since whitespace (which includes newlines) is allowed, it is fine to |
|
|
1168 | specify multiple lines in C<PERL_ANYEVENT_LOG>, e.g.: |
|
|
1169 | |
|
|
1170 | PERL_ANYEVENT_LOG=" |
|
|
1171 | filter=warn |
|
|
1172 | AnyEvent::Debug=+%trace |
|
|
1173 | %trace=only,trace,+log |
|
|
1174 | " myprog |
|
|
1175 | |
|
|
1176 | Also, in the unlikely case when you want to concatenate specifications, |
|
|
1177 | use whitespace as separator, as C<::> will be interpreted as part of a |
|
|
1178 | module name, an empty spec with two separators: |
|
|
1179 | |
|
|
1180 | PERL_ANYEVENT_LOG="$PERL_ANYEVENT_LOG MyMod=debug" |
|
|
1181 | |
|
|
1182 | =cut |
|
|
1183 | |
|
|
1184 | for (my $spec = $ENV{PERL_ANYEVENT_LOG}) { |
|
|
1185 | my %anon; |
|
|
1186 | |
|
|
1187 | my $pkg = sub { |
|
|
1188 | $_[0] eq "log" ? $LOG |
|
|
1189 | : $_[0] eq "filter" ? $FILTER |
|
|
1190 | : $_[0] eq "collect" ? $COLLECT |
|
|
1191 | : $_[0] =~ /^%(.+)$/ ? ($anon{$1} ||= ctx undef) |
|
|
1192 | : $_[0] =~ /^(.*?)(?:::)?$/ ? ctx "$1" # egad :/ |
|
|
1193 | : die # never reached? |
|
|
1194 | }; |
|
|
1195 | |
|
|
1196 | /\G[[:space:]]+/gc; # skip initial whitespace |
|
|
1197 | |
|
|
1198 | while (/\G((?:[^:=[:space:]]+|::|\\.)+)=/gc) { |
|
|
1199 | my $ctx = $pkg->($1); |
|
|
1200 | my $level = "level"; |
|
|
1201 | |
|
|
1202 | while (/\G((?:[^,:[:space:]]+|::|\\.)+)/gc) { |
|
|
1203 | for ("$1") { |
|
|
1204 | if ($_ eq "stderr" ) { $ctx->log_to_warn; |
|
|
1205 | } elsif (/^file=(.+)/ ) { $ctx->log_to_file ("$1"); |
|
|
1206 | } elsif (/^path=(.+)/ ) { $ctx->log_to_path ("$1"); |
|
|
1207 | } elsif (/syslog(?:=(.*))?/ ) { require Sys::Syslog; $ctx->log_to_syslog ($1); |
|
|
1208 | } elsif ($_ eq "nolog" ) { $ctx->log_cb (undef); |
|
|
1209 | } elsif (/^\+(.+)$/ ) { $ctx->attach ($pkg->("$1")); |
|
|
1210 | } elsif ($_ eq "+" ) { $ctx->slaves; |
|
|
1211 | } elsif ($_ eq "off" or $_ eq "0") { $ctx->level (0); |
|
|
1212 | } elsif ($_ eq "all" ) { $ctx->level ("all"); |
|
|
1213 | } elsif ($_ eq "level" ) { $ctx->level ("all"); $level = "level"; |
|
|
1214 | } elsif ($_ eq "only" ) { $ctx->level ("off"); $level = "enable"; |
|
|
1215 | } elsif ($_ eq "except" ) { $ctx->level ("all"); $level = "disable"; |
|
|
1216 | } elsif (/^\d$/ ) { $ctx->$level ($_); |
|
|
1217 | } elsif (exists $STR2LEVEL{$_} ) { $ctx->$level ($_); |
|
|
1218 | } else { die "PERL_ANYEVENT_LOG ($spec): parse error at '$_'\n"; |
|
|
1219 | } |
|
|
1220 | } |
|
|
1221 | |
|
|
1222 | /\G,/gc or last; |
|
|
1223 | } |
|
|
1224 | |
|
|
1225 | /\G[:[:space:]]+/gc or last; |
|
|
1226 | } |
|
|
1227 | |
|
|
1228 | /\G[[:space:]]+/gc; # skip trailing whitespace |
|
|
1229 | |
|
|
1230 | if (/\G(.+)/g) { |
|
|
1231 | die "PERL_ANYEVENT_LOG ($spec): parse error at '$1'\n"; |
|
|
1232 | } |
|
|
1233 | } |
|
|
1234 | |
909 | 1; |
1235 | 1; |
910 | |
1236 | |
911 | =back |
|
|
912 | |
|
|
913 | =head1 EXAMPLES |
1237 | =head1 EXAMPLES |
914 | |
1238 | |
915 | This section shows some common configurations. |
1239 | This section shows some common configurations, both as code, and as |
|
|
1240 | C<PERL_ANYEVENT_LOG> string. |
916 | |
1241 | |
917 | =over 4 |
1242 | =over 4 |
918 | |
1243 | |
919 | =item Setting the global logging level. |
1244 | =item Setting the global logging level. |
920 | |
1245 | |
921 | Either put PERL_ANYEVENT_VERBOSE=<number> into your environment before |
1246 | Either put C<PERL_ANYEVENT_VERBOSE=><number> into your environment before |
922 | running your program, or modify the log level of the root context: |
1247 | running your program, use C<PERL_ANYEVENT_LOG> or modify the log level of |
|
|
1248 | the root context at runtime: |
923 | |
1249 | |
924 | PERL_ANYEVENT_VERBOSE=5 ./myprog |
1250 | PERL_ANYEVENT_VERBOSE=5 ./myprog |
925 | |
1251 | |
|
|
1252 | PERL_ANYEVENT_LOG=log=warn |
|
|
1253 | |
926 | $AnyEvent::Log::FILTER->level ("warn"); |
1254 | $AnyEvent::Log::FILTER->level ("warn"); |
927 | |
1255 | |
928 | =item Append all messages to a file instead of sending them to STDERR. |
1256 | =item Append all messages to a file instead of sending them to STDERR. |
929 | |
1257 | |
930 | This is affected by the global logging level. |
1258 | This is affected by the global logging level. |
931 | |
1259 | |
932 | $AnyEvent::Log::LOG->log_to_file ($path); (sub { |
1260 | $AnyEvent::Log::LOG->log_to_file ($path); |
|
|
1261 | |
|
|
1262 | PERL_ANYEVENT_LOG=log=file=/some/path |
933 | |
1263 | |
934 | =item Write all messages with priority C<error> and higher to a file. |
1264 | =item Write all messages with priority C<error> and higher to a file. |
935 | |
1265 | |
936 | This writes them only when the global logging level allows it, because |
1266 | 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 |
1267 | it is attached to the default context which is invoked I<after> global |
938 | filtering. |
1268 | filtering. |
939 | |
1269 | |
940 | $AnyEvent::Log::FILTER->attach |
1270 | $AnyEvent::Log::FILTER->attach ( |
941 | new AnyEvent::Log::Ctx log_to_file => $path); |
1271 | new AnyEvent::Log::Ctx log_to_file => $path); |
|
|
1272 | |
|
|
1273 | PERL_ANYEVENT_LOG=filter=+%filelogger:%filelogger=file=/some/path |
942 | |
1274 | |
943 | This writes them regardless of the global logging level, because it is |
1275 | This writes them regardless of the global logging level, because it is |
944 | attached to the toplevel context, which receives all messages I<before> |
1276 | attached to the toplevel context, which receives all messages I<before> |
945 | the global filtering. |
1277 | the global filtering. |
946 | |
1278 | |
947 | $AnyEvent::Log::COLLECT->attach ( |
1279 | $AnyEvent::Log::COLLECT->attach ( |
948 | new AnyEvent::Log::Ctx log_to_file => $path); |
1280 | new AnyEvent::Log::Ctx log_to_file => $path); |
949 | |
1281 | |
|
|
1282 | PERL_ANYEVENT_LOG=%filelogger=file=/some/path:collect=+%filelogger |
|
|
1283 | |
950 | In both cases, messages are still written to STDERR. |
1284 | In both cases, messages are still written to STDERR. |
951 | |
1285 | |
952 | =item Write trace messages (only) from L<AnyEvent::Debug> to the default logging target(s). |
1286 | =item Write trace messages (only) from L<AnyEvent::Debug> to the default logging target(s). |
953 | |
1287 | |
954 | Attach the C<$AnyEvent::Log::LOG> context to the C<AnyEvent::Debug> |
1288 | Attach the C<$AnyEvent::Log::LOG> context to the C<AnyEvent::Debug> |
955 | context - this simply circumvents the global filtering for trace messages. |
1289 | context - this simply circumvents the global filtering for trace messages. |
956 | |
1290 | |
957 | my $debug = AnyEvent::Debug->AnyEvent::Log::ctx; |
1291 | my $debug = AnyEvent::Debug->AnyEvent::Log::ctx; |
958 | $debug->attach ($AnyEvent::Log::LOG); |
1292 | $debug->attach ($AnyEvent::Log::LOG); |
|
|
1293 | |
|
|
1294 | PERL_ANYEVENT_LOG=AnyEvent::Debug=+log |
959 | |
1295 | |
960 | This of course works for any package, not just L<AnyEvent::Debug>, but |
1296 | 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 |
1297 | assumes the log level for AnyEvent::Debug hasn't been changed from the |
962 | default. |
1298 | default. |
963 | |
1299 | |
… | |
… | |
967 | |
1303 | |
968 | Marc Lehmann <schmorp@schmorp.de> |
1304 | Marc Lehmann <schmorp@schmorp.de> |
969 | http://home.schmorp.de/ |
1305 | http://home.schmorp.de/ |
970 | |
1306 | |
971 | =cut |
1307 | =cut |
|
|
1308 | |