… | |
… | |
6 | |
6 | |
7 | Simple uses: |
7 | Simple uses: |
8 | |
8 | |
9 | use AnyEvent; |
9 | use AnyEvent; |
10 | |
10 | |
11 | AE::log debug => "hit my knee"; |
11 | AE::log trace => "going to call function abc"; |
12 | AE::log warn => "it's a bit too hot"; |
12 | AE::log debug => "the function returned 3"; |
13 | AE::log error => "the flag was false!"; |
13 | AE::log info => "file soandso successfully deleted"; |
14 | AE::log fatal => "the bit toggled! run!"; # never returns |
14 | AE::log note => "wanted to create config, but config was already 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 |
15 | |
20 | |
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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 | |
16 | "Complex" uses (for speed sensitive code): |
34 | "Complex" uses (for speed sensitive code, e.g. trace/debug messages): |
17 | |
35 | |
18 | use AnyEvent::Log; |
36 | use AnyEvent::Log; |
19 | |
37 | |
20 | my $tracer = AnyEvent::Log::logger trace => \$my $trace; |
38 | my $tracer = AnyEvent::Log::logger trace => \$my $trace; |
21 | |
39 | |
… | |
… | |
32 | |
50 | |
33 | # send all critical and higher priority messages to syslog, |
51 | # send all critical and higher priority messages to syslog, |
34 | # regardless of (most) other settings |
52 | # regardless of (most) other settings |
35 | $AnyEvent::Log::COLLECT->attach (new AnyEvent::Log::Ctx |
53 | $AnyEvent::Log::COLLECT->attach (new AnyEvent::Log::Ctx |
36 | level => "critical", |
54 | level => "critical", |
37 | log_to_syslog => 0, |
55 | log_to_syslog => "user", |
38 | ); |
56 | ); |
39 | |
57 | |
40 | =head1 DESCRIPTION |
58 | =head1 DESCRIPTION |
41 | |
59 | |
42 | This module implements a relatively simple "logging framework". It doesn't |
60 | This module implements a relatively simple "logging framework". It doesn't |
43 | 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 |
44 | AnyEvent - AnyEvent simply creates logging messages internally, and this |
62 | AnyEvent - AnyEvent simply creates logging messages internally, and this |
45 | module more or less exposes the mechanism, with some extra spiff to allow |
63 | module more or less exposes the mechanism, with some extra spiff to allow |
46 | using it from other modules as well. |
64 | using it from other modules as well. |
47 | |
65 | |
48 | Remember that the default verbosity level is C<0> (C<off>), so nothing |
66 | Remember that the default verbosity level is C<3> (C<critical>), so little |
49 | 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 |
50 | 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 |
51 | something like: |
69 | something like: |
52 | |
70 | |
53 | use AnyEvent::Log; |
71 | use AnyEvent::Log; |
54 | AnyEvent::Log::FILTER->level ("info"); |
72 | $AnyEvent::Log::FILTER->level ("info"); |
55 | |
73 | |
56 | 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), |
57 | 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 |
58 | 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 |
59 | targets, or being able to log into a database. |
77 | targets, or being able to log into a database. |
60 | |
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 | |
61 | The amount of documentation might indicate otherwise, but the module is |
82 | The amount of documentation might indicate otherwise, but the runtime part |
62 | still just below 300 lines of code. |
83 | of the module is still just below 300 lines of code. |
63 | |
84 | |
64 | =head1 LOGGING LEVELS |
85 | =head1 LOGGING LEVELS |
65 | |
86 | |
66 | 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> |
67 | (lowest priority). Note that the lowest numerical value is the highest |
88 | (lowest priority). Note that the lowest numerical value is the highest |
… | |
… | |
69 | numerical value". |
90 | numerical value". |
70 | |
91 | |
71 | 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: |
72 | |
93 | |
73 | LVL NAME SYSLOG PERL NOTE |
94 | LVL NAME SYSLOG PERL NOTE |
74 | 1 fatal emerg exit aborts program! |
95 | 1 fatal emerg exit system unusable, aborts program! |
75 | 2 alert |
96 | 2 alert failure in primary system |
76 | 3 critical crit |
97 | 3 critical crit failure in backup system |
77 | 4 error err die |
98 | 4 error err die non-urgent program errors, a bug |
78 | 5 warn warning |
99 | 5 warn warning possible problem, not necessarily error |
79 | 6 note notice |
100 | 6 note notice unusual conditions |
80 | 7 info |
101 | 7 info normal messages, no action required |
81 | 8 debug |
102 | 8 debug debugging messages for development |
82 | 9 trace |
103 | 9 trace copious tracing output |
83 | |
104 | |
84 | 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 |
85 | 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) |
86 | 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> |
87 | 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. |
88 | |
110 | |
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111 | As a rough guideline, levels 1..3 are primarily meant for users of the |
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112 | program (admins, staff), and are the only ones 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. |
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115 | |
89 | You can normally only log a single message at highest priority level |
116 | You can normally only log a message once at highest priority level (C<1>, |
90 | (C<1>, C<fatal>), because logging a fatal message will also quit the |
117 | C<fatal>), because logging a fatal message will also quit the program - so |
91 | program - so use it sparingly :) |
118 | use it sparingly :) |
92 | |
119 | |
93 | Some methods also offer some extra levels, such as C<0>, C<off>, C<none> |
120 | Some methods also offer some extra levels, such as C<0>, C<off>, C<none> |
94 | or C<all> - these are only valid in the methods they are documented for. |
121 | or C<all> - these are only valid for the methods that documented them. |
95 | |
122 | |
96 | =head1 LOGGING FUNCTIONS |
123 | =head1 LOGGING FUNCTIONS |
97 | |
124 | |
98 | These functions allow you to log messages. They always use the caller's |
125 | The following functions allow you to log messages. They always use the |
99 | package as a "logging context". Also, the main logging function C<log> is |
126 | caller's package as a "logging context". Also, the main logging function, |
100 | callable as C<AnyEvent::log> or C<AE::log> when the C<AnyEvent> module is |
127 | C<log>, is aliased to C<AnyEvent::log> and C<AE::log> when the C<AnyEvent> |
101 | loaded. |
128 | module is loaded. |
102 | |
129 | |
103 | =over 4 |
130 | =over 4 |
104 | |
131 | |
105 | =cut |
132 | =cut |
106 | |
133 | |
107 | package AnyEvent::Log; |
134 | package AnyEvent::Log; |
108 | |
135 | |
109 | use Carp (); |
136 | use Carp (); |
110 | use POSIX (); |
137 | use POSIX (); |
111 | |
138 | |
|
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139 | # layout of a context |
|
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140 | # 0 1 2 3 4, 5 |
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141 | # [$title, $level, %$slaves, &$logcb, &$fmtcb, $cap] |
|
|
142 | |
112 | use AnyEvent (); BEGIN { AnyEvent::common_sense } |
143 | use AnyEvent (); BEGIN { AnyEvent::common_sense } |
113 | use AnyEvent::Util (); |
144 | #use AnyEvent::Util (); need to load this in a delayed fashion, as it uses AE::log |
114 | |
145 | |
115 | our $VERSION = $AnyEvent::VERSION; |
146 | our $VERSION = $AnyEvent::VERSION; |
116 | |
147 | |
117 | our ($COLLECT, $FILTER, $LOG); |
148 | our ($COLLECT, $FILTER, $LOG); |
118 | |
149 | |
… | |
… | |
148 | =item AnyEvent::Log::log $level, $msg[, @args] |
179 | =item AnyEvent::Log::log $level, $msg[, @args] |
149 | |
180 | |
150 | Requests logging of the given C<$msg> with the given log level, and |
181 | Requests logging of the given C<$msg> with the given log level, and |
151 | returns true if the message was logged I<somewhere>. |
182 | returns true if the message was logged I<somewhere>. |
152 | |
183 | |
153 | For C<fatal> log levels, the program will abort. |
184 | For loglevel C<fatal>, the program will abort. |
154 | |
185 | |
155 | If only a C<$msg> is given, it is logged as-is. With extra C<@args>, the |
186 | If only a C<$msg> is given, it is logged as-is. With extra C<@args>, the |
156 | C<$msg> is interpreted as an sprintf format string. |
187 | C<$msg> is interpreted as an sprintf format string. |
157 | |
188 | |
158 | The C<$msg> should not end with C<\n>, but may if that is convenient for |
189 | The C<$msg> should not end with C<\n>, but may if that is convenient for |
… | |
… | |
160 | |
191 | |
161 | Last not least, C<$msg> might be a code reference, in which case it is |
192 | Last not least, C<$msg> might be a code reference, in which case it is |
162 | supposed to return the message. It will be called only then the message |
193 | supposed to return the message. It will be called only then the message |
163 | actually gets logged, which is useful if it is costly to create the |
194 | actually gets logged, which is useful if it is costly to create the |
164 | message in the first place. |
195 | message in the first place. |
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196 | |
|
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197 | This function takes care of saving and restoring C<$!> and C<$@>, so you |
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198 | don't have to. |
165 | |
199 | |
166 | Whether the given message will be logged depends on the maximum log level |
200 | Whether the given message will be logged depends on the maximum log level |
167 | and the caller's package. The return value can be used to ensure that |
201 | and the caller's package. The return value can be used to ensure that |
168 | messages or not "lost" - for example, when L<AnyEvent::Debug> detects a |
202 | messages or not "lost" - for example, when L<AnyEvent::Debug> detects a |
169 | runtime error it tries to log it at C<die> level, but if that message is |
203 | runtime error it tries to log it at C<die> level, but if that message is |
… | |
… | |
203 | info => 7, |
237 | info => 7, |
204 | debug => 8, |
238 | debug => 8, |
205 | trace => 9, |
239 | trace => 9, |
206 | ); |
240 | ); |
207 | |
241 | |
208 | sub now () { time } |
242 | our $TIME_EXACT; |
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243 | |
|
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244 | sub exact_time($) { |
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245 | $TIME_EXACT = shift; |
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246 | *_ts = $AnyEvent::MODEL |
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247 | ? $TIME_EXACT ? \&AE::now : \&AE::time |
|
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248 | : sub () { $TIME_EXACT ? do { require Time::HiRes; Time::HiRes::time () } : time }; |
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249 | } |
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250 | |
|
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251 | BEGIN { |
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252 | exact_time 0; |
|
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253 | } |
209 | |
254 | |
210 | AnyEvent::post_detect { |
255 | AnyEvent::post_detect { |
211 | *now = \&AE::now; |
256 | exact_time $TIME_EXACT; |
212 | }; |
257 | }; |
213 | |
258 | |
214 | our @LEVEL2STR = qw(0 fatal alert crit error warn note info debug trace); |
259 | our @LEVEL2STR = qw(0 fatal alert crit error warn note info debug trace); |
215 | |
260 | |
216 | # time, ctx, level, msg |
261 | # time, ctx, level, msg |
… | |
… | |
226 | } |
271 | } |
227 | |
272 | |
228 | join "", @res |
273 | join "", @res |
229 | } |
274 | } |
230 | |
275 | |
|
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276 | sub fatal_exit() { |
|
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277 | exit 1; |
|
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278 | } |
|
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279 | |
231 | sub _log { |
280 | sub _log { |
232 | my ($ctx, $level, $format, @args) = @_; |
281 | my ($ctx, $level, $format, @args) = @_; |
233 | |
282 | |
234 | $level = $level > 0 && $level <= 9 |
283 | $level = $level > 0 && $level <= 9 |
235 | ? $level+0 |
284 | ? $level+0 |
236 | : $STR2LEVEL{$level} || Carp::croak "$level: not a valid logging level, caught"; |
285 | : $STR2LEVEL{$level} || Carp::croak "$level: not a valid logging level, caught"; |
237 | |
286 | |
238 | my $mask = 1 << $level; |
287 | my $mask = 1 << $level; |
239 | |
288 | |
240 | my ($success, %seen, @ctx, $now, $fmt); |
289 | my ($success, %seen, @ctx, $now, @fmt); |
241 | |
290 | |
242 | do |
291 | do |
243 | { |
292 | { |
244 | # skip if masked |
293 | # if !ref, then it's a level number |
|
|
294 | if (!ref $ctx) { |
|
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295 | $level = $ctx; |
245 | if ($ctx->[1] & $mask && !$seen{$ctx+0}++) { |
296 | } elsif ($ctx->[1] & $mask and !$seen{$ctx+0}++) { |
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297 | # logging/recursing into this context |
|
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298 | |
|
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299 | # level cap |
|
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300 | if ($ctx->[5] > $level) { |
|
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301 | push @ctx, $level; # restore level when going up in tree |
|
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302 | $level = $ctx->[5]; |
|
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303 | } |
|
|
304 | |
|
|
305 | # log if log cb |
246 | if ($ctx->[3]) { |
306 | if ($ctx->[3]) { |
247 | # logging target found |
307 | # logging target found |
|
|
308 | |
|
|
309 | local ($!, $@); |
248 | |
310 | |
249 | # now get raw message, unless we have it already |
311 | # now get raw message, unless we have it already |
250 | unless ($now) { |
312 | unless ($now) { |
251 | $format = $format->() if ref $format; |
313 | $format = $format->() if ref $format; |
252 | $format = sprintf $format, @args if @args; |
314 | $format = sprintf $format, @args if @args; |
253 | $format =~ s/\n$//; |
315 | $format =~ s/\n$//; |
254 | $now = AE::now; |
316 | $now = _ts; |
255 | }; |
317 | }; |
256 | |
318 | |
257 | # format msg |
319 | # format msg |
258 | my $str = $ctx->[4] |
320 | my $str = $ctx->[4] |
259 | ? $ctx->[4]($now, $_[0], $level, $format) |
321 | ? $ctx->[4]($now, $_[0], $level, $format) |
260 | : ($fmt ||= _format $now, $_[0], $level, $format); |
322 | : ($fmt[$level] ||= _format $now, $_[0], $level, $format); |
261 | |
323 | |
262 | $success = 1; |
324 | $success = 1; |
263 | |
325 | |
264 | $ctx->[3]($str) |
326 | $ctx->[3]($str) |
265 | or push @ctx, values %{ $ctx->[2] }; # not consumed - propagate |
327 | or push @ctx, values %{ $ctx->[2] }; # not consumed - propagate |
… | |
… | |
268 | } |
330 | } |
269 | } |
331 | } |
270 | } |
332 | } |
271 | while $ctx = pop @ctx; |
333 | while $ctx = pop @ctx; |
272 | |
334 | |
273 | exit 1 if $level <= 1; |
335 | fatal_exit if $level <= 1; |
274 | |
336 | |
275 | $success |
337 | $success |
276 | } |
338 | } |
277 | |
339 | |
278 | sub log($$;@) { |
340 | sub log($$;@) { |
279 | _log |
341 | _log |
280 | $CTX{ (caller)[0] } ||= _pkg_ctx +(caller)[0], |
342 | $CTX{ (caller)[0] } ||= _pkg_ctx +(caller)[0], |
281 | @_; |
343 | @_; |
282 | } |
344 | } |
283 | |
345 | |
284 | *AnyEvent::log = *AE::log = \&log; |
|
|
285 | |
|
|
286 | =item $logger = AnyEvent::Log::logger $level[, \$enabled] |
346 | =item $logger = AnyEvent::Log::logger $level[, \$enabled] |
287 | |
347 | |
288 | Creates a code reference that, when called, acts as if the |
348 | Creates a code reference that, when called, acts as if the |
289 | C<AnyEvent::Log::log> function was called at this point with the given |
349 | C<AnyEvent::Log::log> function was called at this point with the given |
290 | level. C<$logger> is passed a C<$msg> and optional C<@args>, just as with |
350 | level. C<$logger> is passed a C<$msg> and optional C<@args>, just as with |
… | |
… | |
354 | |
414 | |
355 | $LOGGER{$logger+0} = $logger; |
415 | $LOGGER{$logger+0} = $logger; |
356 | |
416 | |
357 | _reassess $logger+0; |
417 | _reassess $logger+0; |
358 | |
418 | |
|
|
419 | require AnyEvent::Util unless $AnyEvent::Util::VERSION; |
359 | my $guard = AnyEvent::Util::guard { |
420 | my $guard = AnyEvent::Util::guard (sub { |
360 | # "clean up" |
421 | # "clean up" |
361 | delete $LOGGER{$logger+0}; |
422 | delete $LOGGER{$logger+0}; |
362 | }; |
423 | }); |
363 | |
424 | |
364 | sub { |
425 | sub { |
365 | $guard if 0; # keep guard alive, but don't cause runtime overhead |
426 | $guard if 0; # keep guard alive, but don't cause runtime overhead |
366 | |
427 | |
367 | _log $ctx, $level, @_ |
428 | _log $ctx, $level, @_ |
… | |
… | |
372 | sub logger($;$) { |
433 | sub logger($;$) { |
373 | _logger |
434 | _logger |
374 | $CTX{ (caller)[0] } ||= _pkg_ctx +(caller)[0], |
435 | $CTX{ (caller)[0] } ||= _pkg_ctx +(caller)[0], |
375 | @_ |
436 | @_ |
376 | } |
437 | } |
|
|
438 | |
|
|
439 | =item AnyEvent::Log::exact_time $on |
|
|
440 | |
|
|
441 | By default, C<AnyEvent::Log> will use C<AE::now>, i.e. the cached |
|
|
442 | eventloop time, for the log timestamps. After calling this function with a |
|
|
443 | true value it will instead resort to C<AE::time>, i.e. fetch the current |
|
|
444 | time on each log message. This only makes a difference for event loops |
|
|
445 | that actually cache the time (such as L<EV> or L<AnyEvent::Loop>). |
|
|
446 | |
|
|
447 | This setting can be changed at any time by calling this function. |
|
|
448 | |
|
|
449 | Since C<AnyEvent::Log> has to work even before the L<AnyEvent> has been |
|
|
450 | initialised, this switch will also decide whether to use C<CORE::time> or |
|
|
451 | C<Time::HiRes::time> when logging a message before L<AnyEvent> becomes |
|
|
452 | available. |
377 | |
453 | |
378 | =back |
454 | =back |
379 | |
455 | |
380 | =head1 LOGGING CONTEXTS |
456 | =head1 LOGGING CONTEXTS |
381 | |
457 | |
… | |
… | |
501 | This can be used to implement config-file (re-)loading: before loading a |
577 | This can be used to implement config-file (re-)loading: before loading a |
502 | configuration, reset all contexts. |
578 | configuration, reset all contexts. |
503 | |
579 | |
504 | =cut |
580 | =cut |
505 | |
581 | |
|
|
582 | our $ORIG_VERBOSE = $AnyEvent::VERBOSE; |
|
|
583 | $AnyEvent::VERBOSE = 9; |
|
|
584 | |
506 | sub reset { |
585 | sub reset { |
507 | # hard to kill complex data structures |
586 | # hard to kill complex data structures |
508 | # we "recreate" all package loggers and reset the hierarchy |
587 | # we "recreate" all package loggers and reset the hierarchy |
509 | while (my ($k, $v) = each %CTX) { |
588 | while (my ($k, $v) = each %CTX) { |
510 | @$v = ($k, (1 << 10) - 1 - 1, { }); |
589 | @$v = ($k, (1 << 10) - 1 - 1, { }); |
… | |
… | |
513 | } |
592 | } |
514 | |
593 | |
515 | @$_ = ($_->[0], (1 << 10) - 1 - 1) |
594 | @$_ = ($_->[0], (1 << 10) - 1 - 1) |
516 | for $LOG, $FILTER, $COLLECT; |
595 | for $LOG, $FILTER, $COLLECT; |
517 | |
596 | |
518 | $LOG->slaves; |
597 | #$LOG->slaves; |
519 | $LOG->title ('$AnyEvent::Log::LOG'); |
598 | $LOG->title ('$AnyEvent::Log::LOG'); |
520 | $LOG->log_to_warn; |
599 | $LOG->log_to_warn; |
521 | |
600 | |
522 | $FILTER->slaves ($LOG); |
601 | $FILTER->slaves ($LOG); |
523 | $FILTER->title ('$AnyEvent::Log::FILTER'); |
602 | $FILTER->title ('$AnyEvent::Log::FILTER'); |
524 | $FILTER->level ($AnyEvent::VERBOSE); |
603 | $FILTER->level ($ORIG_VERBOSE); |
525 | |
604 | |
526 | $COLLECT->slaves ($FILTER); |
605 | $COLLECT->slaves ($FILTER); |
527 | $COLLECT->title ('$AnyEvent::Log::COLLECT'); |
606 | $COLLECT->title ('$AnyEvent::Log::COLLECT'); |
528 | |
607 | |
529 | _reassess; |
608 | _reassess; |
530 | } |
609 | } |
|
|
610 | |
|
|
611 | # override AE::log/logger |
|
|
612 | *AnyEvent::log = *AE::log = \&log; |
|
|
613 | *AnyEvent::logger = *AE::logger = \&logger; |
|
|
614 | |
|
|
615 | # convert AnyEvent loggers to AnyEvent::Log loggers |
|
|
616 | $_->[0] = ctx $_->[0] # convert "pkg" to "ctx" |
|
|
617 | for values %LOGGER; |
531 | |
618 | |
532 | # create the default logger contexts |
619 | # create the default logger contexts |
533 | $LOG = ctx undef; |
620 | $LOG = ctx undef; |
534 | $FILTER = ctx undef; |
621 | $FILTER = ctx undef; |
535 | $COLLECT = ctx undef; |
622 | $COLLECT = ctx undef; |
… | |
… | |
544 | package AnyEvent::Log::COLLECT; |
631 | package AnyEvent::Log::COLLECT; |
545 | package AE::Log::COLLECT; |
632 | package AE::Log::COLLECT; |
546 | |
633 | |
547 | package AnyEvent::Log::Ctx; |
634 | package AnyEvent::Log::Ctx; |
548 | |
635 | |
549 | # 0 1 2 3 4 |
|
|
550 | # [$title, $level, %$slaves, &$logcb, &$fmtcb] |
|
|
551 | |
|
|
552 | =item $ctx = new AnyEvent::Log::Ctx methodname => param... |
636 | =item $ctx = new AnyEvent::Log::Ctx methodname => param... |
553 | |
637 | |
554 | This is a convenience constructor that makes it simpler to construct |
638 | This is a convenience constructor that makes it simpler to construct |
555 | anonymous logging contexts. |
639 | anonymous logging contexts. |
556 | |
640 | |
… | |
… | |
643 | |
727 | |
644 | =item $ctx->disable ($level[, $level...]) |
728 | =item $ctx->disable ($level[, $level...]) |
645 | |
729 | |
646 | Disables logging for the given levels, leaving all others unchanged. |
730 | Disables logging for the given levels, leaving all others unchanged. |
647 | |
731 | |
|
|
732 | =item $ctx->cap ($level) |
|
|
733 | |
|
|
734 | Caps the maximum priority to the given level, for all messages logged |
|
|
735 | to, or passing through, this context. That is, while this doesn't affect |
|
|
736 | whether a message is logged or passed on, the maximum priority of messages |
|
|
737 | will be limited to the specified level - messages with a higher priority |
|
|
738 | will be set to the specified priority. |
|
|
739 | |
|
|
740 | Another way to view this is that C<< ->level >> filters out messages with |
|
|
741 | a too low priority, while C<< ->cap >> modifies messages with a too high |
|
|
742 | priority. |
|
|
743 | |
|
|
744 | This is useful when different log targets have different interpretations |
|
|
745 | of priority. For example, for a specific command line program, a wrong |
|
|
746 | command line switch might well result in a C<fatal> log message, while the |
|
|
747 | same message, logged to syslog, is likely I<not> fatal to the system or |
|
|
748 | syslog facility as a whole, but more likely a mere C<error>. |
|
|
749 | |
|
|
750 | This can be modeled by having a stderr logger that logs messages "as-is" |
|
|
751 | and a syslog logger that logs messages with a level cap of, say, C<error>, |
|
|
752 | or, for truly system-critical components, actually C<critical>. |
|
|
753 | |
648 | =cut |
754 | =cut |
649 | |
755 | |
650 | sub _lvl_lst { |
756 | sub _lvl_lst { |
651 | map { |
757 | map { |
652 | $_ > 0 && $_ <= 9 ? $_+0 |
758 | $_ > 0 && $_ <= 9 ? $_+0 |
653 | : $_ eq "all" ? (1 .. 9) |
759 | : $_ eq "all" ? (1 .. 9) |
654 | : $STR2LEVEL{$_} || Carp::croak "$_: not a valid logging level, caught" |
760 | : $STR2LEVEL{$_} || Carp::croak "$_: not a valid logging level, caught" |
655 | } @_ |
761 | } @_ |
656 | } |
762 | } |
657 | |
763 | |
|
|
764 | sub _lvl { |
|
|
765 | $_[0] =~ /^(?:0|off|none)$/ ? 0 : (_lvl_lst $_[0])[-1] |
|
|
766 | } |
|
|
767 | |
658 | our $NOP_CB = sub { 0 }; |
768 | our $NOP_CB = sub { 0 }; |
659 | |
769 | |
660 | sub levels { |
770 | sub levels { |
661 | my $ctx = shift; |
771 | my $ctx = shift; |
662 | $ctx->[1] = 0; |
772 | $ctx->[1] = 0; |
… | |
… | |
665 | AnyEvent::Log::_reassess; |
775 | AnyEvent::Log::_reassess; |
666 | } |
776 | } |
667 | |
777 | |
668 | sub level { |
778 | sub level { |
669 | my $ctx = shift; |
779 | my $ctx = shift; |
670 | my $lvl = $_[0] =~ /^(?:0|off|none)$/ ? 0 : (_lvl_lst $_[0])[-1]; |
|
|
671 | |
|
|
672 | $ctx->[1] = ((1 << $lvl) - 1) << 1; |
780 | $ctx->[1] = ((1 << &_lvl) - 1) << 1; |
673 | AnyEvent::Log::_reassess; |
781 | AnyEvent::Log::_reassess; |
674 | } |
782 | } |
675 | |
783 | |
676 | sub enable { |
784 | sub enable { |
677 | my $ctx = shift; |
785 | my $ctx = shift; |
… | |
… | |
685 | $ctx->[1] &= ~(1 << $_) |
793 | $ctx->[1] &= ~(1 << $_) |
686 | for &_lvl_lst; |
794 | for &_lvl_lst; |
687 | AnyEvent::Log::_reassess; |
795 | AnyEvent::Log::_reassess; |
688 | } |
796 | } |
689 | |
797 | |
|
|
798 | sub cap { |
|
|
799 | my $ctx = shift; |
|
|
800 | $ctx->[5] = &_lvl; |
|
|
801 | } |
|
|
802 | |
690 | =back |
803 | =back |
691 | |
804 | |
692 | =head3 SLAVE CONTEXTS |
805 | =head3 SLAVE CONTEXTS |
693 | |
806 | |
694 | The following methods attach and detach another logging context to a |
807 | The following methods attach and detach another logging context to a |
… | |
… | |
834 | |
947 | |
835 | Needless(?) to say, if you do not want to be bitten by some evil person |
948 | Needless(?) to say, if you do not want to be bitten by some evil person |
836 | calling C<chdir>, the path should be absolute. Doesn't help with |
949 | calling C<chdir>, the path should be absolute. Doesn't help with |
837 | C<chroot>, but hey... |
950 | C<chroot>, but hey... |
838 | |
951 | |
839 | =item $ctx->log_to_syslog ([$log_flags]) |
952 | =item $ctx->log_to_syslog ([$facility]) |
840 | |
953 | |
841 | Logs all messages via L<Sys::Syslog>, mapping C<trace> to C<debug> and all |
954 | Logs all messages via L<Sys::Syslog>, mapping C<trace> to C<debug> and |
842 | the others in the obvious way. If specified, then the C<$log_flags> are |
955 | all the others in the obvious way. If specified, then the C<$facility> is |
843 | simply or'ed onto the priority argument and can contain any C<LOG_xxx> |
956 | used as the facility (C<user>, C<auth>, C<local0> and so on). The default |
844 | flags valid for Sys::Syslog::syslog, except for the priority levels. |
957 | facility is C<user>. |
845 | |
958 | |
846 | Note that this function also sets a C<fmt_cb> - the logging part requires |
959 | Note that this function also sets a C<fmt_cb> - the logging part requires |
847 | an array reference with [$level, $str] as input. |
960 | an array reference with [$level, $str] as input. |
848 | |
961 | |
849 | =cut |
962 | =cut |
… | |
… | |
892 | 0 |
1005 | 0 |
893 | }); |
1006 | }); |
894 | } |
1007 | } |
895 | |
1008 | |
896 | sub log_to_syslog { |
1009 | sub log_to_syslog { |
897 | my ($ctx, $flags) = @_; |
1010 | my ($ctx, $facility) = @_; |
898 | |
1011 | |
899 | require Sys::Syslog; |
1012 | require Sys::Syslog; |
900 | |
1013 | |
901 | $ctx->fmt_cb (sub { |
1014 | $ctx->fmt_cb (sub { |
902 | my $str = $_[3]; |
1015 | my $str = $_[3]; |
903 | $str =~ s/\n(?=.)/\n+ /g; |
1016 | $str =~ s/\n(?=.)/\n+ /g; |
904 | |
1017 | |
905 | [$_[2], "($_[1][0]) $str"] |
1018 | [$_[2], "($_[1][0]) $str"] |
906 | }); |
1019 | }); |
907 | |
1020 | |
|
|
1021 | $facility ||= "user"; |
|
|
1022 | |
908 | $ctx->log_cb (sub { |
1023 | $ctx->log_cb (sub { |
909 | my $lvl = $_[0][0] < 9 ? $_[0][0] : 8; |
1024 | my $lvl = $_[0][0] < 9 ? $_[0][0] : 8; |
910 | |
1025 | |
911 | Sys::Syslog::syslog ($flags | ($lvl - 1), $_) |
1026 | Sys::Syslog::syslog ("$facility|" . ($lvl - 1), $_) |
912 | for split /\n/, $_[0][1]; |
1027 | for split /\n/, $_[0][1]; |
913 | |
1028 | |
914 | 0 |
1029 | 0 |
915 | }); |
1030 | }); |
916 | } |
1031 | } |
… | |
… | |
1012 | Configures the context to log to a file with the given path. Works like |
1127 | Configures the context to log to a file with the given path. Works like |
1013 | C<log_to_path>. |
1128 | C<log_to_path>. |
1014 | |
1129 | |
1015 | =item C<syslog> or C<syslog=>I<expr> |
1130 | =item C<syslog> or C<syslog=>I<expr> |
1016 | |
1131 | |
1017 | Configured the context to log to syslog. If I<expr> is given, then it is |
1132 | Configures the context to log to syslog. If I<expr> is given, then it is |
1018 | evaluated in the L<Sys::Syslog> package, so you could use: |
1133 | evaluated in the L<Sys::Syslog> package, so you could use: |
1019 | |
1134 | |
1020 | log=syslog=LOG_LOCAL0 |
1135 | log=syslog=LOG_LOCAL0 |
1021 | |
1136 | |
1022 | =item C<nolog> |
1137 | =item C<nolog> |
1023 | |
1138 | |
1024 | Configures the context to not log anything by itself, which is the |
1139 | Configures the context to not log anything by itself, which is the |
1025 | default. Same as C<< $ctx->log_cb (undef) >>. |
1140 | default. Same as C<< $ctx->log_cb (undef) >>. |
1026 | |
1141 | |
|
|
1142 | =item C<cap=>I<level> |
|
|
1143 | |
|
|
1144 | Caps logging messages entering this context at the given level, i.e. |
|
|
1145 | reduces the priority of messages with higher priority than this level. The |
|
|
1146 | default is C<0> (or C<off>), meaning the priority will not be touched. |
|
|
1147 | |
1027 | =item C<0> or C<off> |
1148 | =item C<0> or C<off> |
1028 | |
1149 | |
1029 | Sets the logging level of the context ot C<0>, i.e. all messages will be |
1150 | Sets the logging level of the context to C<0>, i.e. all messages will be |
1030 | filtered out. |
1151 | filtered out. |
1031 | |
1152 | |
1032 | =item C<all> |
1153 | =item C<all> |
1033 | |
1154 | |
1034 | Enables all logging levels, i.e. filtering will effectively be switched |
1155 | Enables all logging levels, i.e. filtering will effectively be switched |
… | |
… | |
1064 | filter=warn |
1185 | filter=warn |
1065 | |
1186 | |
1066 | # or, more verbose |
1187 | # or, more verbose |
1067 | filter=only,level,warn |
1188 | filter=only,level,warn |
1068 | |
1189 | |
1069 | =item C<1>..C<9>, a logging level name (C<error>, C<debug> etc.) |
1190 | =item C<1>..C<9> or a logging level name (C<error>, C<debug> etc.) |
1070 | |
1191 | |
1071 | A numeric loglevel or the name of a loglevel will be interpreted according |
1192 | A numeric loglevel or the name of a loglevel will be interpreted according |
1072 | to the most recent C<only>, C<except> or C<level> directive. By default, |
1193 | to the most recent C<only>, C<except> or C<level> directive. By default, |
1073 | specifying a logging level enables that and any higher priority messages. |
1194 | specifying a logging level enables that and any higher priority messages. |
1074 | |
1195 | |
1075 | =item C<+>I<context> |
1196 | =item C<+>I<context> |
1076 | |
1197 | |
1077 | Adds/attaches the named context as slave to the context. |
1198 | Attaches the named context as slave to the context. |
1078 | |
1199 | |
1079 | =item C<+> |
1200 | =item C<+> |
1080 | |
1201 | |
1081 | A line C<+> clears the slave list form the context. Anonymous (C<%name>) |
1202 | A lone C<+> detaches all contexts, i.e. clears the slave list from the |
1082 | contexts have no slaves by default, but package contexts have the parent |
1203 | context. Anonymous (C<%name>) contexts have no attached slaves by default, |
1083 | context as slave by default. |
1204 | but package contexts have the parent context as slave by default. |
1084 | |
1205 | |
1085 | Example: log messages from My::Module to a file, do not send them to the |
1206 | Example: log messages from My::Module to a file, do not send them to the |
1086 | default log collector. |
1207 | default log collector. |
1087 | |
1208 | |
1088 | My::Module=+,file=/tmp/mymodulelog |
1209 | My::Module=+,file=/tmp/mymodulelog |
1089 | |
1210 | |
1090 | =back |
1211 | =back |
1091 | |
1212 | |
|
|
1213 | Any character can be escaped by prefixing it with a C<\> (backslash), as |
|
|
1214 | usual, so to log to a file containing a comma, colon, backslash and some |
|
|
1215 | spaces in the filename, you would do this: |
|
|
1216 | |
|
|
1217 | PERL_ANYEVENT_LOG='log=file=/some\ \:file\ with\,\ \\-escapes' |
|
|
1218 | |
|
|
1219 | Since whitespace (which includes newlines) is allowed, it is fine to |
|
|
1220 | specify multiple lines in C<PERL_ANYEVENT_LOG>, e.g.: |
|
|
1221 | |
|
|
1222 | PERL_ANYEVENT_LOG=" |
|
|
1223 | filter=warn |
|
|
1224 | AnyEvent::Debug=+%trace |
|
|
1225 | %trace=only,trace,+log |
|
|
1226 | " myprog |
|
|
1227 | |
|
|
1228 | Also, in the unlikely case when you want to concatenate specifications, |
|
|
1229 | use whitespace as separator, as C<::> will be interpreted as part of a |
|
|
1230 | module name, an empty spec with two separators: |
|
|
1231 | |
|
|
1232 | PERL_ANYEVENT_LOG="$PERL_ANYEVENT_LOG MyMod=debug" |
|
|
1233 | |
1092 | =cut |
1234 | =cut |
1093 | |
1235 | |
1094 | for (my $spec = $ENV{PERL_ANYEVENT_LOG}) { |
1236 | for (my $spec = $ENV{PERL_ANYEVENT_LOG}) { |
1095 | my %anon; |
1237 | my %anon; |
1096 | |
1238 | |
1097 | my $pkg = sub { |
1239 | my $pkg = sub { |
1098 | $_[0] eq "log" ? $LOG |
1240 | $_[0] eq "log" ? $LOG |
1099 | : $_[0] eq "filter" ? $FILTER |
1241 | : $_[0] eq "filter" ? $FILTER |
1100 | : $_[0] eq "collect" ? $COLLECT |
1242 | : $_[0] eq "collect" ? $COLLECT |
1101 | : $_[0] =~ /^%(.+)$/ && $anon{$1} ||= ctx undef |
1243 | : $_[0] =~ /^%(.+)$/ ? ($anon{$1} ||= do { my $ctx = ctx undef; $ctx->[0] = $_[0]; $ctx }) |
1102 | : $_[0] =~ /^(.*?)(?:::)?$/ && ctx "$1" # egad :/ |
1244 | : $_[0] =~ /^(.*?)(?:::)?$/ ? ctx "$1" # egad :/ |
|
|
1245 | : die # never reached? |
1103 | }; |
1246 | }; |
1104 | |
1247 | |
|
|
1248 | /\G[[:space:]]+/gc; # skip initial whitespace |
|
|
1249 | |
1105 | while (/\G((?:[^:=]+|::|\\.)+)=/gc) { |
1250 | while (/\G((?:[^:=[:space:]]+|::|\\.)+)=/gc) { |
1106 | my $ctx = $pkg->($1); |
1251 | my $ctx = $pkg->($1); |
1107 | my $level = "level"; |
1252 | my $level = "level"; |
1108 | |
1253 | |
1109 | while (/\G((?:[^,:[:space:]]+|::|\\.)+)/gc) { |
1254 | while (/\G((?:[^,:[:space:]]+|::|\\.)+)/gc) { |
1110 | for ("$1") { |
1255 | for ("$1") { |
1111 | if ($_ eq "stderr" ) { $ctx->log_to_warn; |
1256 | if ($_ eq "stderr" ) { $ctx->log_to_warn; |
1112 | } elsif (/^file=(.+)/ ) { $ctx->log_to_file ("$1"); |
1257 | } elsif (/^file=(.+)/ ) { $ctx->log_to_file ("$1"); |
1113 | } elsif (/^path=(.+)/ ) { $ctx->log_to_path ("$1"); |
1258 | } elsif (/^path=(.+)/ ) { $ctx->log_to_path ("$1"); |
1114 | } elsif (/syslog(?:=(.*))?/ ) { require Sys::Syslog; $ctx->log_to_syslog (eval "package Sys::Syslog; $1"); |
1259 | } elsif (/^syslog(?:=(.*))?/ ) { require Sys::Syslog; $ctx->log_to_syslog ("$1"); |
1115 | } elsif ($_ eq "nolog" ) { $ctx->log_cb (undef); |
1260 | } elsif ($_ eq "nolog" ) { $ctx->log_cb (undef); |
|
|
1261 | } elsif (/^cap=(.+)/ ) { $ctx->cap ("$1"); |
1116 | } elsif (/^\+(.+)$/ ) { $ctx->attach ($pkg->("$1")); |
1262 | } elsif (/^\+(.+)$/ ) { $ctx->attach ($pkg->("$1")); |
1117 | } elsif ($_ eq "+" ) { $ctx->slaves; |
1263 | } elsif ($_ eq "+" ) { $ctx->slaves; |
1118 | } elsif ($_ eq "off" or $_ eq "0") { $ctx->level (0); |
1264 | } elsif ($_ eq "off" or $_ eq "0") { $ctx->level (0); |
1119 | } elsif ($_ eq "all" ) { $ctx->level ("all"); |
1265 | } elsif ($_ eq "all" ) { $ctx->level ("all"); |
1120 | } elsif ($_ eq "level" ) { $ctx->level ("all"); $level = "level"; |
1266 | } elsif ($_ eq "level" ) { $ctx->level ("all"); $level = "level"; |
… | |
… | |
1127 | } |
1273 | } |
1128 | |
1274 | |
1129 | /\G,/gc or last; |
1275 | /\G,/gc or last; |
1130 | } |
1276 | } |
1131 | |
1277 | |
1132 | /\G[:[:space:]]/gc or last; |
1278 | /\G[:[:space:]]+/gc or last; |
1133 | } |
1279 | } |
|
|
1280 | |
|
|
1281 | /\G[[:space:]]+/gc; # skip trailing whitespace |
1134 | |
1282 | |
1135 | if (/\G(.+)/g) { |
1283 | if (/\G(.+)/g) { |
1136 | die "PERL_ANYEVENT_LOG ($spec): parse error at '$1'\n"; |
1284 | die "PERL_ANYEVENT_LOG ($spec): parse error at '$1'\n"; |
1137 | } |
1285 | } |
1138 | } |
1286 | } |
1139 | |
1287 | |
1140 | 1; |
1288 | 1; |
1141 | |
1289 | |
1142 | =head1 EXAMPLES |
1290 | =head1 EXAMPLES |
1143 | |
1291 | |
1144 | This section shows some common configurations. |
1292 | This section shows some common configurations, both as code, and as |
|
|
1293 | C<PERL_ANYEVENT_LOG> string. |
1145 | |
1294 | |
1146 | =over 4 |
1295 | =over 4 |
1147 | |
1296 | |
1148 | =item Setting the global logging level. |
1297 | =item Setting the global logging level. |
1149 | |
1298 | |
1150 | Either put PERL_ANYEVENT_VERBOSE=<number> into your environment before |
1299 | Either put C<PERL_ANYEVENT_VERBOSE=><number> into your environment before |
1151 | running your program, or modify the log level of the root context: |
1300 | running your program, use C<PERL_ANYEVENT_LOG> or modify the log level of |
|
|
1301 | the root context at runtime: |
1152 | |
1302 | |
1153 | PERL_ANYEVENT_VERBOSE=5 ./myprog |
1303 | PERL_ANYEVENT_VERBOSE=5 ./myprog |
1154 | |
1304 | |
|
|
1305 | PERL_ANYEVENT_LOG=log=warn |
|
|
1306 | |
1155 | $AnyEvent::Log::FILTER->level ("warn"); |
1307 | $AnyEvent::Log::FILTER->level ("warn"); |
1156 | |
1308 | |
1157 | =item Append all messages to a file instead of sending them to STDERR. |
1309 | =item Append all messages to a file instead of sending them to STDERR. |
1158 | |
1310 | |
1159 | This is affected by the global logging level. |
1311 | This is affected by the global logging level. |
1160 | |
1312 | |
1161 | $AnyEvent::Log::LOG->log_to_file ($path); (sub { |
1313 | $AnyEvent::Log::LOG->log_to_file ($path); |
|
|
1314 | |
|
|
1315 | PERL_ANYEVENT_LOG=log=file=/some/path |
1162 | |
1316 | |
1163 | =item Write all messages with priority C<error> and higher to a file. |
1317 | =item Write all messages with priority C<error> and higher to a file. |
1164 | |
1318 | |
1165 | This writes them only when the global logging level allows it, because |
1319 | This writes them only when the global logging level allows it, because |
1166 | it is attached to the default context which is invoked I<after> global |
1320 | it is attached to the default context which is invoked I<after> global |
1167 | filtering. |
1321 | filtering. |
1168 | |
1322 | |
1169 | $AnyEvent::Log::FILTER->attach |
1323 | $AnyEvent::Log::FILTER->attach ( |
1170 | new AnyEvent::Log::Ctx log_to_file => $path); |
1324 | new AnyEvent::Log::Ctx log_to_file => $path); |
|
|
1325 | |
|
|
1326 | PERL_ANYEVENT_LOG=filter=+%filelogger:%filelogger=file=/some/path |
1171 | |
1327 | |
1172 | This writes them regardless of the global logging level, because it is |
1328 | This writes them regardless of the global logging level, because it is |
1173 | attached to the toplevel context, which receives all messages I<before> |
1329 | attached to the toplevel context, which receives all messages I<before> |
1174 | the global filtering. |
1330 | the global filtering. |
1175 | |
1331 | |
1176 | $AnyEvent::Log::COLLECT->attach ( |
1332 | $AnyEvent::Log::COLLECT->attach ( |
1177 | new AnyEvent::Log::Ctx log_to_file => $path); |
1333 | new AnyEvent::Log::Ctx log_to_file => $path); |
1178 | |
1334 | |
|
|
1335 | PERL_ANYEVENT_LOG=%filelogger=file=/some/path:collect=+%filelogger |
|
|
1336 | |
1179 | In both cases, messages are still written to STDERR. |
1337 | In both cases, messages are still written to STDERR. |
|
|
1338 | |
|
|
1339 | =item Additionally log all messages with C<warn> and higher priority to |
|
|
1340 | C<syslog>, but cap at C<error>. |
|
|
1341 | |
|
|
1342 | This logs all messages to the default log target, but also logs messages |
|
|
1343 | with priority C<warn> or higher (and not filtered otherwise) to syslog |
|
|
1344 | facility C<user>. Messages with priority higher than C<error> will be |
|
|
1345 | logged with level C<error>. |
|
|
1346 | |
|
|
1347 | $AnyEvent::Log::LOG->attach ( |
|
|
1348 | new AnyEvent::Log::Ctx |
|
|
1349 | level => "warn", |
|
|
1350 | cap => "error", |
|
|
1351 | syslog => "user", |
|
|
1352 | ); |
|
|
1353 | |
|
|
1354 | PERL_ANYEVENT_LOG=log=+%syslog:%syslog=warn,cap=error,syslog |
1180 | |
1355 | |
1181 | =item Write trace messages (only) from L<AnyEvent::Debug> to the default logging target(s). |
1356 | =item Write trace messages (only) from L<AnyEvent::Debug> to the default logging target(s). |
1182 | |
1357 | |
1183 | Attach the C<$AnyEvent::Log::LOG> context to the C<AnyEvent::Debug> |
1358 | Attach the C<$AnyEvent::Log::LOG> context to the C<AnyEvent::Debug> |
1184 | context - this simply circumvents the global filtering for trace messages. |
1359 | context - this simply circumvents the global filtering for trace messages. |
1185 | |
1360 | |
1186 | my $debug = AnyEvent::Debug->AnyEvent::Log::ctx; |
1361 | my $debug = AnyEvent::Debug->AnyEvent::Log::ctx; |
1187 | $debug->attach ($AnyEvent::Log::LOG); |
1362 | $debug->attach ($AnyEvent::Log::LOG); |
|
|
1363 | |
|
|
1364 | PERL_ANYEVENT_LOG=AnyEvent::Debug=+log |
1188 | |
1365 | |
1189 | This of course works for any package, not just L<AnyEvent::Debug>, but |
1366 | This of course works for any package, not just L<AnyEvent::Debug>, but |
1190 | assumes the log level for AnyEvent::Debug hasn't been changed from the |
1367 | assumes the log level for AnyEvent::Debug hasn't been changed from the |
1191 | default. |
1368 | default. |
1192 | |
1369 | |
… | |
… | |
1196 | |
1373 | |
1197 | Marc Lehmann <schmorp@schmorp.de> |
1374 | Marc Lehmann <schmorp@schmorp.de> |
1198 | http://home.schmorp.de/ |
1375 | http://home.schmorp.de/ |
1199 | |
1376 | |
1200 | =cut |
1377 | =cut |
|
|
1378 | |