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2 | |
3 | AnyEvent::Log - simple logging "framework" |
3 | AnyEvent::Log - simple logging "framework" |
4 | |
4 | |
5 | =head1 SYNOPSIS |
5 | =head1 SYNOPSIS |
6 | |
6 | |
7 | # simple use |
7 | Simple uses: |
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8 | |
8 | use AnyEvent; |
9 | use AnyEvent; |
9 | |
10 | |
10 | AE::log debug => "hit my knee"; |
11 | AE::log debug => "hit my knee"; |
11 | AE::log warn => "it's a bit too hot"; |
12 | AE::log warn => "it's a bit too hot"; |
12 | AE::log error => "the flag was false!"; |
13 | AE::log error => "the flag was false!"; |
13 | AE::log fatal => "the bit toggled! run!"; |
14 | AE::log fatal => "the bit toggled! run!"; # never returns |
14 | |
15 | |
15 | # "complex" use |
16 | "Complex" uses (for speed sensitive code): |
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17 | |
16 | use AnyEvent::Log; |
18 | use AnyEvent::Log; |
17 | |
19 | |
18 | my $tracer = AnyEvent::Log::logger trace => \$my $trace; |
20 | my $tracer = AnyEvent::Log::logger trace => \$my $trace; |
19 | |
21 | |
20 | $tracer->("i am here") if $trace; |
22 | $tracer->("i am here") if $trace; |
21 | $tracer->(sub { "lots of data: " . Dumper $self }) if $trace; |
23 | $tracer->(sub { "lots of data: " . Dumper $self }) if $trace; |
22 | |
24 | |
23 | # configuration |
25 | Configuration (also look at the EXAMPLES section): |
24 | |
26 | |
25 | # set logging for this package to maximum |
27 | # set logging for the current package to errors and higher only |
26 | AnyEvent::Log::ctx->level ("all"); |
28 | AnyEvent::Log::ctx->level ("error"); |
27 | |
29 | |
28 | # set logging globally to anything below debug |
30 | # set logging level to suppress anything below "notice" |
29 | (AnyEvent::Log::ctx "")->level ("notice"); |
31 | $AnyEvent::Log::FILTER->level ("notice"); |
30 | |
32 | |
31 | # see also EXAMPLES, below |
33 | # send all critical and higher priority messages to syslog, |
32 | |
34 | # regardless of (most) other settings |
33 | # disable logging for package "AnyEvent" and all packages below it |
35 | $AnyEvent::Log::COLLECT->attach (new AnyEvent::Log::Ctx |
34 | AnyEvent->AnyEvent::Log::ctx->level (0); |
36 | level => "critical", |
35 | |
37 | log_to_syslog => 0, |
36 | # log everything below debug to a file, for the whole program |
38 | ); |
37 | my $ctx = AnyEvent::Log::ctx; |
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38 | $ctx->log_cb (sub { print FILE shift; 0 }); |
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39 | (AnyEvent::Log::ctx "")->add ($ctx); |
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40 | |
39 | |
41 | =head1 DESCRIPTION |
40 | =head1 DESCRIPTION |
42 | |
41 | |
43 | This module implements a relatively simple "logging framework". It doesn't |
42 | This module implements a relatively simple "logging framework". It doesn't |
44 | attempt to be "the" logging solution or even "a" logging solution for |
43 | attempt to be "the" logging solution or even "a" logging solution for |
45 | AnyEvent - AnyEvent simply creates logging messages internally, and this |
44 | AnyEvent - AnyEvent simply creates logging messages internally, and this |
46 | module more or less exposes the mechanism, with some extra spiff to allow |
45 | module more or less exposes the mechanism, with some extra spiff to allow |
47 | using it from other modules as well. |
46 | using it from other modules as well. |
48 | |
47 | |
49 | Remember that the default verbosity level is C<0>, so nothing will be |
48 | Remember that the default verbosity level is C<0> (C<off>), so nothing |
50 | logged, unless you set C<PERL_ANYEVENT_VERBOSE> to a higher number before |
49 | will be logged, unless you set C<PERL_ANYEVENT_VERBOSE> to a higher number |
51 | starting your program, or change the logging level at runtime with |
50 | before starting your program, or change the logging level at runtime with |
52 | something like: |
51 | something like: |
53 | |
52 | |
54 | use AnyEvent; |
53 | use AnyEvent::Log; |
55 | (AnyEvent::Log::ctx "")->level ("info"); |
54 | AnyEvent::Log::FILTER->level ("info"); |
56 | |
55 | |
57 | The design goal behind this module was to keep it simple (and small), |
56 | The design goal behind this module was to keep it simple (and small), |
58 | but make it powerful enough to be potentially useful for any module, and |
57 | but make it powerful enough to be potentially useful for any module, and |
59 | extensive enough for the most common tasks, such as logging to multiple |
58 | extensive enough for the most common tasks, such as logging to multiple |
60 | targets, or being able to log into a database. |
59 | targets, or being able to log into a database. |
61 | |
60 | |
62 | The amount of documentation might indicate otherwise, but the module is |
61 | The amount of documentation might indicate otherwise, but the module is |
63 | still just 240 lines or so. |
62 | still just below 300 lines of code. |
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63 | |
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64 | =head1 LOGGING LEVELS |
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65 | |
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66 | Logging levels in this module range from C<1> (highest priority) to C<9> |
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67 | (lowest priority). Note that the lowest numerical value is the highest |
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68 | priority, so when this document says "higher priority" it means "lower |
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69 | numerical value". |
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70 | |
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71 | Instead of specifying levels by name you can also specify them by aliases: |
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72 | |
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73 | LVL NAME SYSLOG PERL NOTE |
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74 | 1 fatal emerg exit aborts program! |
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75 | 2 alert |
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76 | 3 critical crit |
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77 | 4 error err die |
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78 | 5 warn warning |
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79 | 6 note notice |
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80 | 7 info |
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81 | 8 debug |
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82 | 9 trace |
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83 | |
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84 | As you can see, some logging levels have multiple aliases - the first one |
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85 | is the "official" name, the second one the "syslog" name (if it differs) |
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86 | and the third one the "perl" name, suggesting that you log C<die> messages |
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87 | at C<error> priority. |
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88 | |
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89 | You can normally only log a single message at highest priority level |
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90 | (C<1>, C<fatal>), because logging a fatal message will also quit the |
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91 | program - so use it sparingly :) |
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92 | |
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93 | Some methods also offer some extra levels, such as C<0>, C<off>, C<none> |
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94 | or C<all> - these are only valid in the methods they are documented for. |
64 | |
95 | |
65 | =head1 LOGGING FUNCTIONS |
96 | =head1 LOGGING FUNCTIONS |
66 | |
97 | |
67 | These functions allow you to log messages. They always use the caller's |
98 | These functions allow you to log messages. They always use the caller's |
68 | package as a "logging module/source". Also, the main logging function is |
99 | package as a "logging context". Also, the main logging function C<log> is |
69 | callable as C<AnyEvent::log> or C<AE::log> when the C<AnyEvent> module is |
100 | callable as C<AnyEvent::log> or C<AE::log> when the C<AnyEvent> module is |
70 | loaded. |
101 | loaded. |
71 | |
102 | |
72 | =over 4 |
103 | =over 4 |
73 | |
104 | |
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80 | |
111 | |
81 | use AnyEvent (); BEGIN { AnyEvent::common_sense } |
112 | use AnyEvent (); BEGIN { AnyEvent::common_sense } |
82 | use AnyEvent::Util (); |
113 | use AnyEvent::Util (); |
83 | |
114 | |
84 | our $VERSION = $AnyEvent::VERSION; |
115 | our $VERSION = $AnyEvent::VERSION; |
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116 | |
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117 | our ($COLLECT, $FILTER, $LOG); |
85 | |
118 | |
86 | our ($now_int, $now_str1, $now_str2); |
119 | our ($now_int, $now_str1, $now_str2); |
87 | |
120 | |
88 | # Format Time, not public - yet? |
121 | # Format Time, not public - yet? |
89 | sub ft($) { |
122 | sub ft($) { |
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94 | if $now_int != $i; |
127 | if $now_int != $i; |
95 | |
128 | |
96 | "$now_str1$f$now_str2" |
129 | "$now_str1$f$now_str2" |
97 | } |
130 | } |
98 | |
131 | |
99 | our %CTX; # all logging contexts |
132 | our %CTX; # all package contexts |
100 | |
133 | |
101 | # creates a default package context object for the given package |
134 | # creates a default package context object for the given package |
102 | sub _pkg_ctx($) { |
135 | sub _pkg_ctx($) { |
103 | my $ctx = bless [$_[0], (1 << 10) - 1 - 1, {}], "AnyEvent::Log::Ctx"; |
136 | my $ctx = bless [$_[0], (1 << 10) - 1 - 1, {}], "AnyEvent::Log::Ctx"; |
104 | |
137 | |
105 | # link "parent" package |
138 | # link "parent" package |
106 | my $pkg = $_[0] =~ /^(.+)::/ ? $1 : "AE::Log::Top"; |
139 | my $parent = $_[0] =~ /^(.+)::/ |
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140 | ? $CTX{$1} ||= &_pkg_ctx ("$1") |
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141 | : $COLLECT; |
107 | |
142 | |
108 | $pkg = $CTX{$pkg} ||= &_pkg_ctx ($pkg); |
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109 | $ctx->[2]{$pkg+0} = $pkg; |
143 | $ctx->[2]{$parent+0} = $parent; |
110 | |
144 | |
111 | $ctx |
145 | $ctx |
112 | } |
146 | } |
113 | |
147 | |
114 | =item AnyEvent::Log::log $level, $msg[, @args] |
148 | =item AnyEvent::Log::log $level, $msg[, @args] |
115 | |
149 | |
116 | Requests logging of the given C<$msg> with the given log level (1..9). |
150 | Requests logging of the given C<$msg> with the given log level, and |
117 | You can also use the following strings as log level: C<fatal> (1), |
151 | returns true if the message was logged I<somewhere>. |
118 | C<alert> (2), C<critical> (3), C<error> (4), C<warn> (5), C<note> (6), |
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119 | C<info> (7), C<debug> (8), C<trace> (9). |
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120 | |
152 | |
121 | For C<fatal> log levels, the program will abort. |
153 | For C<fatal> log levels, the program will abort. |
122 | |
154 | |
123 | If only a C<$msg> is given, it is logged as-is. With extra C<@args>, the |
155 | If only a C<$msg> is given, it is logged as-is. With extra C<@args>, the |
124 | C<$msg> is interpreted as an sprintf format string. |
156 | C<$msg> is interpreted as an sprintf format string. |
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130 | supposed to return the message. It will be called only then the message |
162 | supposed to return the message. It will be called only then the message |
131 | actually gets logged, which is useful if it is costly to create the |
163 | actually gets logged, which is useful if it is costly to create the |
132 | message in the first place. |
164 | message in the first place. |
133 | |
165 | |
134 | Whether the given message will be logged depends on the maximum log level |
166 | Whether the given message will be logged depends on the maximum log level |
135 | and the caller's package. |
167 | and the caller's package. The return value can be used to ensure that |
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168 | messages or not "lost" - for example, when L<AnyEvent::Debug> detects a |
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169 | runtime error it tries to log it at C<die> level, but if that message is |
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170 | lost it simply uses warn. |
136 | |
171 | |
137 | Note that you can (and should) call this function as C<AnyEvent::log> or |
172 | Note that you can (and should) call this function as C<AnyEvent::log> or |
138 | C<AE::log>, without C<use>-ing this module if possible (i.e. you don't |
173 | C<AE::log>, without C<use>-ing this module if possible (i.e. you don't |
139 | need any additional functionality), as those functions will load the |
174 | need any additional functionality), as those functions will load the |
140 | logging module on demand only. They are also much shorter to write. |
175 | logging module on demand only. They are also much shorter to write. |
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157 | |
192 | |
158 | =cut |
193 | =cut |
159 | |
194 | |
160 | # also allow syslog equivalent names |
195 | # also allow syslog equivalent names |
161 | our %STR2LEVEL = ( |
196 | our %STR2LEVEL = ( |
162 | fatal => 1, emerg => 1, |
197 | fatal => 1, emerg => 1, exit => 1, |
163 | alert => 2, |
198 | alert => 2, |
164 | critical => 3, crit => 3, |
199 | critical => 3, crit => 3, |
165 | error => 4, err => 4, |
200 | error => 4, err => 4, die => 4, |
166 | warn => 5, warning => 5, |
201 | warn => 5, warning => 5, |
167 | note => 6, notice => 6, |
202 | note => 6, notice => 6, |
168 | info => 7, |
203 | info => 7, |
169 | debug => 8, |
204 | debug => 8, |
170 | trace => 9, |
205 | trace => 9, |
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200 | ? $level+0 |
235 | ? $level+0 |
201 | : $STR2LEVEL{$level} || Carp::croak "$level: not a valid logging level, caught"; |
236 | : $STR2LEVEL{$level} || Carp::croak "$level: not a valid logging level, caught"; |
202 | |
237 | |
203 | my $mask = 1 << $level; |
238 | my $mask = 1 << $level; |
204 | |
239 | |
205 | my (%seen, @ctx, $now, $fmt); |
240 | my ($success, %seen, @ctx, $now, $fmt); |
206 | |
241 | |
207 | do |
242 | do |
208 | { |
243 | { |
209 | # skip if masked |
244 | # skip if masked |
210 | if ($ctx->[1] & $mask && !$seen{$ctx+0}++) { |
245 | if ($ctx->[1] & $mask && !$seen{$ctx+0}++) { |
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220 | }; |
255 | }; |
221 | |
256 | |
222 | # format msg |
257 | # format msg |
223 | my $str = $ctx->[4] |
258 | my $str = $ctx->[4] |
224 | ? $ctx->[4]($now, $_[0], $level, $format) |
259 | ? $ctx->[4]($now, $_[0], $level, $format) |
225 | : $fmt ||= _format $now, $_[0], $level, $format; |
260 | : ($fmt ||= _format $now, $_[0], $level, $format); |
226 | |
261 | |
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262 | $success = 1; |
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263 | |
227 | $ctx->[3]($str); |
264 | $ctx->[3]($str) |
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265 | or push @ctx, values %{ $ctx->[2] }; # not consumed - propagate |
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266 | } else { |
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267 | push @ctx, values %{ $ctx->[2] }; # not masked - propagate |
228 | } |
268 | } |
229 | |
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230 | # not masked, not consumed - propagate to parent contexts |
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231 | push @ctx, values %{ $ctx->[2] }; |
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232 | } |
269 | } |
233 | } |
270 | } |
234 | while $ctx = pop @ctx; |
271 | while $ctx = pop @ctx; |
235 | |
272 | |
236 | exit 1 if $level <= 1; |
273 | exit 1 if $level <= 1; |
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274 | |
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275 | $success |
237 | } |
276 | } |
238 | |
277 | |
239 | sub log($$;@) { |
278 | sub log($$;@) { |
240 | _log |
279 | _log |
241 | $CTX{ (caller)[0] } ||= _pkg_ctx +(caller)[0], |
280 | $CTX{ (caller)[0] } ||= _pkg_ctx +(caller)[0], |
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245 | *AnyEvent::log = *AE::log = \&log; |
284 | *AnyEvent::log = *AE::log = \&log; |
246 | |
285 | |
247 | =item $logger = AnyEvent::Log::logger $level[, \$enabled] |
286 | =item $logger = AnyEvent::Log::logger $level[, \$enabled] |
248 | |
287 | |
249 | Creates a code reference that, when called, acts as if the |
288 | Creates a code reference that, when called, acts as if the |
250 | C<AnyEvent::Log::log> function was called at this point with the givne |
289 | C<AnyEvent::Log::log> function was called at this point with the given |
251 | level. C<$logger> is passed a C<$msg> and optional C<@args>, just as with |
290 | level. C<$logger> is passed a C<$msg> and optional C<@args>, just as with |
252 | the C<AnyEvent::Log::log> function: |
291 | the C<AnyEvent::Log::log> function: |
253 | |
292 | |
254 | my $debug_log = AnyEvent::Log::logger "debug"; |
293 | my $debug_log = AnyEvent::Log::logger "debug"; |
255 | |
294 | |
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280 | # and later in your program |
319 | # and later in your program |
281 | $debug_log->("yo, stuff here") if $debug; |
320 | $debug_log->("yo, stuff here") if $debug; |
282 | |
321 | |
283 | $debug and $debug_log->("123"); |
322 | $debug and $debug_log->("123"); |
284 | |
323 | |
285 | Note: currently the enabled var is always true - that will be fixed in a |
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286 | future version :) |
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287 | |
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288 | =cut |
324 | =cut |
289 | |
325 | |
290 | our %LOGGER; |
326 | our %LOGGER; |
291 | |
327 | |
292 | # re-assess logging status for all loggers |
328 | # re-assess logging status for all loggers |
293 | sub _reassess { |
329 | sub _reassess { |
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330 | local $SIG{__DIE__}; |
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331 | my $die = sub { die }; |
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332 | |
294 | for (@_ ? $LOGGER{$_[0]} : values %LOGGER) { |
333 | for (@_ ? $LOGGER{$_[0]} : values %LOGGER) { |
295 | my ($ctx, $level, $renabled) = @$_; |
334 | my ($ctx, $level, $renabled) = @$_; |
296 | |
335 | |
297 | # to detect whether a message would be logged, we # actually |
336 | # to detect whether a message would be logged, we actually |
298 | # try to log one and die. this isn't fast, but we can be |
337 | # try to log one and die. this isn't fast, but we can be |
299 | # sure that the logging decision is correct :) |
338 | # sure that the logging decision is correct :) |
300 | |
339 | |
301 | $$renabled = !eval { |
340 | $$renabled = !eval { |
302 | local $SIG{__DIE__}; |
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303 | |
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304 | _log $ctx, $level, sub { die }; |
341 | _log $ctx, $level, $die; |
305 | |
342 | |
306 | 1 |
343 | 1 |
307 | }; |
344 | }; |
308 | |
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309 | $$renabled = 1; # TODO |
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310 | } |
345 | } |
311 | } |
346 | } |
312 | |
347 | |
313 | sub _logger { |
348 | sub _logger { |
314 | my ($ctx, $level, $renabled) = @_; |
349 | my ($ctx, $level, $renabled) = @_; |
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359 | timestamp, context, level and string message and formats it in the way |
394 | timestamp, context, level and string message and formats it in the way |
360 | it should be logged) and a logging callback (which is responsible for |
395 | it should be logged) and a logging callback (which is responsible for |
361 | actually logging the formatted message and telling C<AnyEvent::Log> |
396 | actually logging the formatted message and telling C<AnyEvent::Log> |
362 | whether it has consumed the message, or whether it should be propagated). |
397 | whether it has consumed the message, or whether it should be propagated). |
363 | |
398 | |
364 | For propagation, a context can have any number of attached I<parent |
399 | For propagation, a context can have any number of attached I<slave |
365 | contexts>. Any message that is neither masked by the logging mask nor |
400 | contexts>. Any message that is neither masked by the logging mask nor |
366 | masked by the logging callback returning true will be passed to all parent |
401 | masked by the logging callback returning true will be passed to all slave |
367 | contexts. |
402 | contexts. |
368 | |
403 | |
369 | Each call to a logging function will log the message at most once per |
404 | Each call to a logging function will log the message at most once per |
370 | context, so it does not matter (much) if there are cycles or if the |
405 | context, so it does not matter (much) if there are cycles or if the |
371 | message can arrive at the same context via multiple paths. |
406 | message can arrive at the same context via multiple paths. |
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375 | By default, all logging contexts have an full set of log levels ("all"), a |
410 | By default, all logging contexts have an full set of log levels ("all"), a |
376 | disabled logging callback and the default formatting callback. |
411 | disabled logging callback and the default formatting callback. |
377 | |
412 | |
378 | Package contexts have the package name as logging title by default. |
413 | Package contexts have the package name as logging title by default. |
379 | |
414 | |
380 | They have exactly one parent - the context of the "parent" package. The |
415 | They have exactly one slave - the context of the "parent" package. The |
381 | parent package is simply defined to be the package name without the last |
416 | parent package is simply defined to be the package name without the last |
382 | component, i.e. C<AnyEvent::Debug::Wrapped> becomes C<AnyEvent::Debug>, |
417 | component, i.e. C<AnyEvent::Debug::Wrapped> becomes C<AnyEvent::Debug>, |
383 | and C<AnyEvent> becomes ... C<AnyEvent::Log::Top> which is the |
418 | and C<AnyEvent> becomes ... C<$AnyEvent::Log::COLLECT> which is the |
384 | exception of the rule - just like the parent of any package name in |
419 | exception of the rule - just like the "parent" of any single-component |
385 | Perl is C<main>, the default parent of any top-level package context is |
420 | package name in Perl is C<main>, the default slave of any top-level |
386 | C<AnyEvent::Log::Top>. |
421 | package context is C<$AnyEvent::Log::COLLECT>. |
387 | |
422 | |
388 | Since perl packages form only an approximate hierarchy, this parent |
423 | Since perl packages form only an approximate hierarchy, this slave |
389 | context can of course be removed. |
424 | context can of course be removed. |
390 | |
425 | |
391 | All other (anonymous) contexts have no parents and an empty title by |
426 | All other (anonymous) contexts have no slaves and an empty title by |
392 | default. |
427 | default. |
393 | |
428 | |
394 | When the module is loaded it creates the default context called |
429 | When the module is loaded it creates the C<$AnyEvent::Log::LOG> logging |
395 | C<AnyEvent::Log::Default> (also stored in C<$AnyEvent::Log::Default>), |
430 | context that simply logs everything via C<warn>, without propagating |
396 | which simply logs everything via C<warn> and doesn't propagate anything |
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397 | anywhere by default. The purpose of the default context is to provide |
431 | anything anywhere by default. The purpose of this context is to provide |
398 | a convenient place to override the global logging target or to attach |
432 | a convenient place to override the global logging target or to attach |
399 | additional log targets. It's not meant for filtering. |
433 | additional log targets. It's not meant for filtering. |
400 | |
434 | |
401 | It then creates the root context called C<AnyEvent::Log::Root> (also |
435 | It then creates the C<$AnyEvent::Log::FILTER> context whose |
402 | stored in C<$AnyEvent::Log::Root>) and sets its log level set to all |
436 | purpose is to suppress all messages with priority higher |
403 | levels up to the one specified by C<$ENV{PERL_ANYEVENT_VERBOSE}>. It |
437 | than C<$ENV{PERL_ANYEVENT_VERBOSE}>. It then attached the |
404 | then attached the default logging context to it. The purpose of the root |
438 | C<$AnyEvent::Log::LOG> context to it. The purpose of the filter context |
405 | context is to simply provide filtering according to some global log level. |
439 | is to simply provide filtering according to some global log level. |
406 | |
440 | |
407 | Finally it creates the top-level package context called |
441 | Finally it creates the top-level package context C<$AnyEvent::Log::COLLECT> |
408 | C<AnyEvent::Log::Top> (also stored in, you might have guessed, |
442 | and attaches the C<$AnyEvent::Log::FILTER> context to it, but otherwise |
409 | C<$AnyEvent::Log::Top>) and attached the root context but otherwise leaves |
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410 | it at default config. It's purpose is simply to collect all log messages |
443 | leaves it at default config. Its purpose is simply to collect all log |
411 | system-wide. |
444 | messages system-wide. |
412 | |
445 | |
413 | These three special contexts can also be referred to by the |
446 | The hierarchy is then: |
414 | package/context names C<AE::Log::Default>, C<AE::Log::Root> and |
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415 | C<AE::Log::Top>. |
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416 | |
447 | |
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448 | any package, eventually -> $COLLECT -> $FILTER -> $LOG |
|
|
449 | |
417 | The effect of all this is that log messages, by default, wander up |
450 | The effect of all this is that log messages, by default, wander up to the |
418 | to the root context where log messages with lower priority then |
451 | C<$AnyEvent::Log::COLLECT> context where all messages normally end up, |
|
|
452 | from there to C<$AnyEvent::Log::FILTER> where log messages with lower |
419 | C<$ENV{PERL_ANYEVENT_VERBOSE}> will be filtered away and then to the |
453 | priority then C<$ENV{PERL_ANYEVENT_VERBOSE}> will be filtered out and then |
420 | AnyEvent::Log::Default context to be passed to C<warn>. |
454 | to the C<$AnyEvent::Log::LOG> context to be passed to C<warn>. |
421 | |
455 | |
422 | Splitting the top level context into three contexts makes it easy to set |
456 | This makes it easy to set a global logging level (by modifying $FILTER), |
423 | a global logging level (by modifying the root context), but still allow |
457 | but still allow other contexts to send, for example, their debug and trace |
424 | other contexts to log, for example, their debug and trace messages to the |
|
|
425 | default target despite the global logging level, or to attach additional |
458 | messages to the $LOG target despite the global logging level, or to attach |
426 | log targets that log messages, regardless of the global logging level. |
459 | additional log targets that log messages, regardless of the global logging |
|
|
460 | level. |
427 | |
461 | |
428 | It also makes it easy to replace the default warn-logger by something that |
462 | It also makes it easy to modify the default warn-logger ($LOG) to |
429 | logs to a file, or to attach additional logging targets. |
463 | something that logs to a file, or to attach additional logging targets |
|
|
464 | (such as loggign to a file) by attaching it to $FILTER. |
430 | |
465 | |
431 | =head2 CREATING/FINDING/DESTROYING CONTEXTS |
466 | =head2 CREATING/FINDING/DESTROYING CONTEXTS |
432 | |
467 | |
433 | =over 4 |
468 | =over 4 |
434 | |
469 | |
… | |
… | |
456 | : bless [undef, (1 << 10) - 1 - 1], "AnyEvent::Log::Ctx" |
491 | : bless [undef, (1 << 10) - 1 - 1], "AnyEvent::Log::Ctx" |
457 | } |
492 | } |
458 | |
493 | |
459 | =item AnyEvent::Log::reset |
494 | =item AnyEvent::Log::reset |
460 | |
495 | |
461 | Resets all package contexts contexts and recreates the default hierarchy |
496 | Resets all package contexts and recreates the default hierarchy if |
462 | if necessary, i.e. resets the logging subsystem to defaults. |
497 | necessary, i.e. resets the logging subsystem to defaults, as much as |
|
|
498 | possible. This process keeps references to contexts held by other parts of |
|
|
499 | the program intact. |
463 | |
500 | |
464 | This can be used to implement config-file (re-)loading: before loading a |
501 | This can be used to implement config-file (re-)loading: before loading a |
465 | configuration, reset all contexts. |
502 | configuration, reset all contexts. |
466 | |
503 | |
467 | Note that this currently destroys all logger callbacks - bug me if you |
|
|
468 | need this fixed :) |
|
|
469 | |
|
|
470 | =cut |
504 | =cut |
471 | |
505 | |
472 | sub reset { |
506 | sub reset { |
473 | # hard to kill complex data structures |
507 | # hard to kill complex data structures |
474 | # we recreate all package loggers and reset the hierarchy |
508 | # we "recreate" all package loggers and reset the hierarchy |
475 | while (my ($k, $v) = each %CTX) { |
509 | while (my ($k, $v) = each %CTX) { |
476 | @$v = ($k, (1 << 10) - 1 - 1, { }); |
510 | @$v = ($k, (1 << 10) - 1 - 1, { }); |
477 | |
511 | |
478 | my $pkg = $k =~ /^(.+)::/ ? $1 : "AE::Log::Top"; |
512 | $v->attach ($k =~ /^(.+)::/ ? $CTX{$1} : $AnyEvent::Log::COLLECT); |
479 | $v->attach ($CTX{$pkg}); |
|
|
480 | } |
513 | } |
481 | |
514 | |
482 | $AnyEvent::Log::Default->parents; |
515 | @$_ = ($_->[0], (1 << 10) - 1 - 1) |
483 | $AnyEvent::Log::Default->title ("AnyEvent::Log::Default"); |
516 | for $LOG, $FILTER, $COLLECT; |
484 | $AnyEvent::Log::Default->log_cb (sub { |
|
|
485 | warn shift; |
|
|
486 | 0 |
|
|
487 | }); |
|
|
488 | $CTX{"AnyEvent::Log::Default"} = $CTX{"AE::Log::Default"} = $AnyEvent::Log::Default; |
|
|
489 | |
517 | |
490 | $AnyEvent::Log::Root->parents ($AnyEvent::Log::Default); |
518 | $LOG->slaves; |
491 | $AnyEvent::Log::Root->title ("AnyEvent::Log::Root"); |
519 | $LOG->title ('$AnyEvent::Log::LOG'); |
|
|
520 | $LOG->log_to_warn; |
|
|
521 | |
|
|
522 | $FILTER->slaves ($LOG); |
|
|
523 | $FILTER->title ('$AnyEvent::Log::FILTER'); |
492 | $AnyEvent::Log::Root->level ($AnyEvent::VERBOSE); |
524 | $FILTER->level ($AnyEvent::VERBOSE); |
493 | $CTX{"AnyEvent::Log::Root"} = $CTX{"AE::Log::Root"} = $AnyEvent::Log::Root; |
|
|
494 | |
525 | |
495 | $AnyEvent::Log::Top->parents ($AnyEvent::Log::Root); |
526 | $COLLECT->slaves ($FILTER); |
496 | $AnyEvent::Log::Top->title ("AnyEvent::Log::Top"); |
527 | $COLLECT->title ('$AnyEvent::Log::COLLECT'); |
497 | $CTX{"AnyEvent::Log::Top"} = $CTX{"AE::Log::Top"} = $AnyEvent::Log::Top; |
|
|
498 | |
528 | |
499 | _reassess; |
529 | _reassess; |
500 | } |
530 | } |
501 | |
531 | |
502 | # create the default logger contexts |
532 | # create the default logger contexts |
503 | $AnyEvent::Log::Default = ctx undef; |
533 | $LOG = ctx undef; |
504 | $AnyEvent::Log::Root = ctx undef; |
534 | $FILTER = ctx undef; |
505 | $AnyEvent::Log::Top = ctx undef; |
535 | $COLLECT = ctx undef; |
506 | |
536 | |
507 | AnyEvent::Log::reset; |
537 | AnyEvent::Log::reset; |
508 | |
538 | |
509 | # hello, CPAN, please catch me |
539 | # hello, CPAN, please catch me |
510 | package AnyEvent::Log::Default; |
|
|
511 | package AE::Log::Default; |
|
|
512 | package AnyEvent::Log::Root; |
|
|
513 | package AE::Log::Root; |
|
|
514 | package AnyEvent::Log::Top; |
540 | package AnyEvent::Log::LOG; |
515 | package AE::Log::Top; |
541 | package AE::Log::LOG; |
|
|
542 | package AnyEvent::Log::FILTER; |
|
|
543 | package AE::Log::FILTER; |
|
|
544 | package AnyEvent::Log::COLLECT; |
|
|
545 | package AE::Log::COLLECT; |
516 | |
546 | |
517 | package AnyEvent::Log::Ctx; |
547 | package AnyEvent::Log::Ctx; |
518 | |
548 | |
519 | # 0 1 2 3 4 |
549 | # 0 1 2 3 4 |
520 | # [$title, $level, %$parents, &$logcb, &$fmtcb] |
550 | # [$title, $level, %$slaves, &$logcb, &$fmtcb] |
521 | |
551 | |
522 | =item $ctx = new AnyEvent::Log::Ctx methodname => param... |
552 | =item $ctx = new AnyEvent::Log::Ctx methodname => param... |
523 | |
553 | |
524 | This is a convenience constructor that makes it simpler to construct |
554 | This is a convenience constructor that makes it simpler to construct |
525 | anonymous logging contexts. |
555 | anonymous logging contexts. |
… | |
… | |
528 | name as the key with the value as parameter, unless the value is an |
558 | name as the key with the value as parameter, unless the value is an |
529 | arrayref, in which case it calls the method with the contents of the |
559 | arrayref, in which case it calls the method with the contents of the |
530 | array. The methods are called in the same order as specified. |
560 | array. The methods are called in the same order as specified. |
531 | |
561 | |
532 | Example: create a new logging context and set both the default logging |
562 | Example: create a new logging context and set both the default logging |
533 | level, some parent contexts and a logging callback. |
563 | level, some slave contexts and a logging callback. |
534 | |
564 | |
535 | $ctx = new AnyEvent::Log::Ctx |
565 | $ctx = new AnyEvent::Log::Ctx |
536 | title => "dubious messages", |
566 | title => "dubious messages", |
537 | level => "error", |
567 | level => "error", |
538 | log_cb => sub { print STDOUT shift; 0 }, |
568 | log_cb => sub { print STDOUT shift; 0 }, |
539 | parents => [$ctx1, $ctx, $ctx2], |
569 | slaves => [$ctx1, $ctx, $ctx2], |
540 | ; |
570 | ; |
541 | |
571 | |
542 | =back |
572 | =back |
543 | |
573 | |
544 | =cut |
574 | =cut |
… | |
… | |
657 | AnyEvent::Log::_reassess; |
687 | AnyEvent::Log::_reassess; |
658 | } |
688 | } |
659 | |
689 | |
660 | =back |
690 | =back |
661 | |
691 | |
662 | =head3 PARENT CONTEXTS |
692 | =head3 SLAVE CONTEXTS |
663 | |
693 | |
664 | The following methods attach and detach another logging context to a |
694 | The following methods attach and detach another logging context to a |
665 | logging context. |
695 | logging context. |
666 | |
696 | |
667 | Log messages are propagated to all parent contexts, unless the logging |
697 | Log messages are propagated to all slave contexts, unless the logging |
668 | callback consumes the message. |
698 | callback consumes the message. |
669 | |
699 | |
670 | =over 4 |
700 | =over 4 |
671 | |
701 | |
672 | =item $ctx->attach ($ctx2[, $ctx3...]) |
702 | =item $ctx->attach ($ctx2[, $ctx3...]) |
673 | |
703 | |
674 | Attaches the given contexts as parents to this context. It is not an error |
704 | Attaches the given contexts as slaves to this context. It is not an error |
675 | to add a context twice (the second add will be ignored). |
705 | to add a context twice (the second add will be ignored). |
676 | |
706 | |
677 | A context can be specified either as package name or as a context object. |
707 | A context can be specified either as package name or as a context object. |
678 | |
708 | |
679 | =item $ctx->detach ($ctx2[, $ctx3...]) |
709 | =item $ctx->detach ($ctx2[, $ctx3...]) |
680 | |
710 | |
681 | Removes the given parents from this context - it's not an error to attempt |
711 | Removes the given slaves from this context - it's not an error to attempt |
682 | to remove a context that hasn't been added. |
712 | to remove a context that hasn't been added. |
683 | |
713 | |
684 | A context can be specified either as package name or as a context object. |
714 | A context can be specified either as package name or as a context object. |
685 | |
715 | |
686 | =item $ctx->parents ($ctx2[, $ctx3...]) |
716 | =item $ctx->slaves ($ctx2[, $ctx3...]) |
687 | |
717 | |
688 | Replaces all parents attached to this context by the ones given. |
718 | Replaces all slaves attached to this context by the ones given. |
689 | |
719 | |
690 | =cut |
720 | =cut |
691 | |
721 | |
692 | sub attach { |
722 | sub attach { |
693 | my $ctx = shift; |
723 | my $ctx = shift; |
… | |
… | |
701 | |
731 | |
702 | delete $ctx->[2]{$_+0} |
732 | delete $ctx->[2]{$_+0} |
703 | for map { AnyEvent::Log::ctx $_ } @_; |
733 | for map { AnyEvent::Log::ctx $_ } @_; |
704 | } |
734 | } |
705 | |
735 | |
706 | sub parents { |
736 | sub slaves { |
707 | undef $_[0][2]; |
737 | undef $_[0][2]; |
708 | &attach; |
738 | &attach; |
709 | } |
739 | } |
710 | |
740 | |
711 | =back |
741 | =back |
712 | |
742 | |
713 | =head3 MESSAGE LOGGING |
743 | =head3 LOG TARGETS |
714 | |
744 | |
715 | The following methods configure how the logging context actually does |
745 | The following methods configure how the logging context actually does |
716 | the logging (which consists of formatting the message and printing it or |
746 | the logging (which consists of formatting the message and printing it or |
717 | whatever it wants to do with it) and also allows you to log messages |
747 | whatever it wants to do with it). |
718 | directly to a context, without going via your package context. |
|
|
719 | |
748 | |
720 | =over 4 |
749 | =over 4 |
721 | |
750 | |
722 | =item $ctx->log_cb ($cb->($str)) |
751 | =item $ctx->log_cb ($cb->($str) |
723 | |
752 | |
724 | Replaces the logging callback on the context (C<undef> disables the |
753 | Replaces the logging callback on the context (C<undef> disables the |
725 | logging callback). |
754 | logging callback). |
726 | |
755 | |
727 | The logging callback is responsible for handling formatted log messages |
756 | The logging callback is responsible for handling formatted log messages |
728 | (see C<fmt_cb> below) - normally simple text strings that end with a |
757 | (see C<fmt_cb> below) - normally simple text strings that end with a |
729 | newline (and are possibly multiline themselves). |
758 | newline (and are possibly multiline themselves). |
730 | |
759 | |
731 | It also has to return true iff it has consumed the log message, and false |
760 | It also has to return true iff it has consumed the log message, and false |
732 | if it hasn't. Consuming a message means that it will not be sent to any |
761 | if it hasn't. Consuming a message means that it will not be sent to any |
733 | parent context. When in doubt, return C<0> from your logging callback. |
762 | slave context. When in doubt, return C<0> from your logging callback. |
734 | |
763 | |
735 | Example: a very simple logging callback, simply dump the message to STDOUT |
764 | Example: a very simple logging callback, simply dump the message to STDOUT |
736 | and do not consume it. |
765 | and do not consume it. |
737 | |
766 | |
738 | $ctx->log_cb (sub { print STDERR shift; 0 }); |
767 | $ctx->log_cb (sub { print STDERR shift; 0 }); |
… | |
… | |
746 | your program. |
775 | your program. |
747 | |
776 | |
748 | $ctx->levels ("debug", "trace"); |
777 | $ctx->levels ("debug", "trace"); |
749 | $ctx->log_cb (sub { 1 }); # do not log, but eat debug and trace messages |
778 | $ctx->log_cb (sub { 1 }); # do not log, but eat debug and trace messages |
750 | |
779 | |
751 | =item $ctx->fmt_cb ($fmt_cb->($timestamp, $ctx, $level, $message)) |
780 | =item $ctx->fmt_cb ($fmt_cb->($timestamp, $orig_ctx, $level, $message)) |
752 | |
781 | |
753 | Replaces the formatting callback on the context (C<undef> restores the |
782 | Replaces the formatting callback on the context (C<undef> restores the |
754 | default formatter). |
783 | default formatter). |
755 | |
784 | |
756 | The callback is passed the (possibly fractional) timestamp, the original |
785 | The callback is passed the (possibly fractional) timestamp, the original |
757 | logging context, the (numeric) logging level and the raw message string and needs to |
786 | logging context, the (numeric) logging level and the raw message string |
758 | return a formatted log message. In most cases this will be a string, but |
787 | and needs to return a formatted log message. In most cases this will be a |
759 | it could just as well be an array reference that just stores the values. |
788 | string, but it could just as well be an array reference that just stores |
|
|
789 | the values. |
|
|
790 | |
|
|
791 | If, for some reason, you want to use C<caller> to find out more baout the |
|
|
792 | logger then you should walk up the call stack until you are no longer |
|
|
793 | inside the C<AnyEvent::Log> package. |
760 | |
794 | |
761 | Example: format just the raw message, with numeric log level in angle |
795 | Example: format just the raw message, with numeric log level in angle |
762 | brackets. |
796 | brackets. |
763 | |
797 | |
764 | $ctx->fmt_cb (sub { |
798 | $ctx->fmt_cb (sub { |
… | |
… | |
781 | "$msg->[3]"; |
815 | "$msg->[3]"; |
782 | |
816 | |
783 | 0 |
817 | 0 |
784 | }); |
818 | }); |
785 | |
819 | |
|
|
820 | =item $ctx->log_to_warn |
|
|
821 | |
|
|
822 | Sets the C<log_cb> to simply use C<CORE::warn> to report any messages |
|
|
823 | (usually this logs to STDERR). |
|
|
824 | |
|
|
825 | =item $ctx->log_to_file ($path) |
|
|
826 | |
|
|
827 | Sets the C<log_cb> to log to a file (by appending), unbuffered. |
|
|
828 | |
|
|
829 | =item $ctx->log_to_path ($path) |
|
|
830 | |
|
|
831 | Same as C<< ->log_to_file >>, but opens the file for each message. This |
|
|
832 | is much slower, but allows you to change/move/rename/delete the file at |
|
|
833 | basically any time. |
|
|
834 | |
|
|
835 | 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 |
|
|
837 | C<chroot>, but hey... |
|
|
838 | |
|
|
839 | =item $ctx->log_to_syslog ([$log_flags]) |
|
|
840 | |
|
|
841 | Logs all messages via L<Sys::Syslog>, mapping C<trace> to C<debug> and all |
|
|
842 | the others in the obvious way. If specified, then the C<$log_flags> are |
|
|
843 | simply or'ed onto the priority argument and can contain any C<LOG_xxx> |
|
|
844 | flags valid for Sys::Syslog::syslog, except for the priority levels. |
|
|
845 | |
|
|
846 | Note that this function also sets a C<fmt_cb> - the logging part requires |
|
|
847 | an array reference with [$level, $str] as input. |
|
|
848 | |
786 | =cut |
849 | =cut |
787 | |
850 | |
788 | sub log_cb { |
851 | sub log_cb { |
789 | my ($ctx, $cb) = @_; |
852 | my ($ctx, $cb) = @_; |
790 | |
853 | |
… | |
… | |
795 | my ($ctx, $cb) = @_; |
858 | my ($ctx, $cb) = @_; |
796 | |
859 | |
797 | $ctx->[4] = $cb; |
860 | $ctx->[4] = $cb; |
798 | } |
861 | } |
799 | |
862 | |
800 | =item $ctx->log ($level, $msg[, @params]) |
863 | sub log_to_warn { |
|
|
864 | my ($ctx, $path) = @_; |
801 | |
865 | |
802 | Same as C<AnyEvent::Log::log>, but uses the given context as log context. |
866 | $ctx->log_cb (sub { |
|
|
867 | warn shift; |
|
|
868 | 0 |
|
|
869 | }); |
|
|
870 | } |
803 | |
871 | |
804 | =item $logger = $ctx->logger ($level[, \$enabled]) |
872 | sub log_to_file { |
805 | |
873 | my ($ctx, $path) = @_; |
806 | Same as C<AnyEvent::Log::logger>, but uses the given context as log |
|
|
807 | context. |
|
|
808 | |
|
|
809 | =cut |
|
|
810 | |
|
|
811 | *log = \&AnyEvent::Log::_log; |
|
|
812 | *logger = \&AnyEvent::Log::_logger; |
|
|
813 | |
|
|
814 | 1; |
|
|
815 | |
|
|
816 | =back |
|
|
817 | |
|
|
818 | =head1 EXAMPLES |
|
|
819 | |
|
|
820 | This section shows some common configurations. |
|
|
821 | |
|
|
822 | =over 4 |
|
|
823 | |
|
|
824 | =item Setting the global logging level. |
|
|
825 | |
|
|
826 | Either put PERL_ANYEVENT_VERBOSE=<number> into your environment before |
|
|
827 | running your program, or modify the log level of the root context: |
|
|
828 | |
|
|
829 | PERL_ANYEVENT_VERBOSE=5 ./myprog |
|
|
830 | |
|
|
831 | $AnyEvent::Log::Root->level ("warn"); |
|
|
832 | |
|
|
833 | =item Append all messages to a file instead of sending them to STDERR. |
|
|
834 | |
|
|
835 | This is affected by the global logging level. |
|
|
836 | |
874 | |
837 | open my $fh, ">>", $path |
875 | open my $fh, ">>", $path |
838 | or die "$path: $!"; |
876 | or die "$path: $!"; |
839 | |
877 | |
840 | $AnyEvent::Log::Default->log_cb (sub { |
878 | $ctx->log_cb (sub { |
841 | syswrite $fh, shift; |
879 | syswrite $fh, shift; |
842 | 0 |
880 | 0 |
843 | }); |
881 | }); |
|
|
882 | } |
|
|
883 | |
|
|
884 | sub log_to_path { |
|
|
885 | my ($ctx, $path) = @_; |
|
|
886 | |
|
|
887 | $ctx->log_cb (sub { |
|
|
888 | open my $fh, ">>", $path |
|
|
889 | or die "$path: $!"; |
|
|
890 | |
|
|
891 | syswrite $fh, shift; |
|
|
892 | 0 |
|
|
893 | }); |
|
|
894 | } |
|
|
895 | |
|
|
896 | sub log_to_syslog { |
|
|
897 | my ($ctx, $flags) = @_; |
|
|
898 | |
|
|
899 | require Sys::Syslog; |
|
|
900 | |
|
|
901 | $ctx->fmt_cb (sub { |
|
|
902 | my $str = $_[3]; |
|
|
903 | $str =~ s/\n(?=.)/\n+ /g; |
|
|
904 | |
|
|
905 | [$_[2], "($_[1][0]) $str"] |
|
|
906 | }); |
|
|
907 | |
|
|
908 | $ctx->log_cb (sub { |
|
|
909 | my $lvl = $_[0][0] < 9 ? $_[0][0] : 8; |
|
|
910 | |
|
|
911 | Sys::Syslog::syslog ($flags | ($lvl - 1), $_) |
|
|
912 | for split /\n/, $_[0][1]; |
|
|
913 | |
|
|
914 | 0 |
|
|
915 | }); |
|
|
916 | } |
|
|
917 | |
|
|
918 | =back |
|
|
919 | |
|
|
920 | =head3 MESSAGE LOGGING |
|
|
921 | |
|
|
922 | These methods allow you to log messages directly to a context, without |
|
|
923 | going via your package context. |
|
|
924 | |
|
|
925 | =over 4 |
|
|
926 | |
|
|
927 | =item $ctx->log ($level, $msg[, @params]) |
|
|
928 | |
|
|
929 | Same as C<AnyEvent::Log::log>, but uses the given context as log context. |
|
|
930 | |
|
|
931 | =item $logger = $ctx->logger ($level[, \$enabled]) |
|
|
932 | |
|
|
933 | Same as C<AnyEvent::Log::logger>, but uses the given context as log |
|
|
934 | context. |
|
|
935 | |
|
|
936 | =cut |
|
|
937 | |
|
|
938 | *log = \&AnyEvent::Log::_log; |
|
|
939 | *logger = \&AnyEvent::Log::_logger; |
|
|
940 | |
|
|
941 | =back |
|
|
942 | |
|
|
943 | =cut |
|
|
944 | |
|
|
945 | package AnyEvent::Log; |
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946 | |
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947 | =head1 CONFIGURATION VIA $ENV{PERL_ANYEVENT_LOG} |
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948 | |
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949 | Logging can also be configured by setting the environment variable |
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950 | C<PERL_ANYEVENT_LOG> (or C<AE_LOG>). |
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951 | |
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952 | The value consists of one or more logging context specifications separated |
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953 | by C<:> or whitespace. Each logging specification in turn starts with a |
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954 | context name, followed by C<=>, followed by zero or more comma-separated |
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955 | configuration directives, here are some examples: |
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956 | |
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957 | # set default logging level |
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958 | filter=warn |
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959 | |
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960 | # log to file instead of to stderr |
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961 | log=file=/tmp/mylog |
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962 | |
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963 | # log to file in addition to stderr |
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964 | log=+%file:%file=file=/tmp/mylog |
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965 | |
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966 | # enable debug log messages, log warnings and above to syslog |
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967 | filter=debug:log=+%warnings:%warnings=warn,syslog=LOG_LOCAL0 |
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968 | |
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969 | # log trace messages (only) from AnyEvent::Debug to file |
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970 | AnyEvent::Debug=+%trace:%trace=only,trace,file=/tmp/tracelog |
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971 | |
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972 | A context name in the log specification can be any of the following: |
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973 | |
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974 | =over 4 |
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975 | |
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976 | =item C<collect>, C<filter>, C<log> |
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977 | |
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978 | Correspond to the three predefined C<$AnyEvent::Log::COLLECT>, |
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979 | C<AnyEvent::Log::FILTER> and C<$AnyEvent::Log::LOG> contexts. |
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980 | |
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981 | =item C<%name> |
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982 | |
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983 | Context names starting with a C<%> are anonymous contexts created when the |
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984 | name is first mentioned. The difference to package contexts is that by |
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985 | default they have no attached slaves. |
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986 | |
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987 | =item a perl package name |
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988 | |
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989 | Any other string references the logging context associated with the given |
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990 | Perl C<package>. In the unlikely case where you want to specify a package |
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991 | context that matches on of the other context name forms, you can add a |
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992 | C<::> to the package name to force interpretation as a package. |
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993 | |
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994 | =back |
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995 | |
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996 | The configuration specifications can be any number of the following: |
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997 | |
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998 | =over 4 |
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999 | |
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1000 | =item C<stderr> |
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1001 | |
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1002 | Configures the context to use Perl's C<warn> function (which typically |
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1003 | logs to C<STDERR>). Works like C<log_to_warn>. |
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1004 | |
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1005 | =item C<file=>I<path> |
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1006 | |
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1007 | Configures the context to log to a file with the given path. Works like |
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1008 | C<log_to_file>. |
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1009 | |
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1010 | =item C<path=>I<path> |
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1011 | |
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1012 | Configures the context to log to a file with the given path. Works like |
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1013 | C<log_to_path>. |
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1014 | |
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1015 | =item C<syslog> or C<syslog=>I<expr> |
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1016 | |
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1017 | Configured the context to log to syslog. If I<expr> is given, then it is |
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1018 | evaluated in the L<Sys::Syslog> package, so you could use: |
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1019 | |
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1020 | log=syslog=LOG_LOCAL0 |
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1021 | |
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1022 | =item C<nolog> |
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1023 | |
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1024 | Configures the context to not log anything by itself, which is the |
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1025 | default. Same as C<< $ctx->log_cb (undef) >>. |
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1026 | |
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1027 | =item C<0> or C<off> |
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1028 | |
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1029 | Sets the logging level of the context ot C<0>, i.e. all messages will be |
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1030 | filtered out. |
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1031 | |
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1032 | =item C<all> |
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1033 | |
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1034 | Enables all logging levels, i.e. filtering will effectively be switched |
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1035 | off (the default). |
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1036 | |
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1037 | =item C<only> |
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1038 | |
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1039 | Disables all logging levels, and changes the interpretation of following |
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1040 | level specifications to enable the specified level only. |
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1041 | |
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1042 | Example: only enable debug messages for a context. |
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1043 | |
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1044 | context=only,debug |
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1045 | |
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1046 | =item C<except> |
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1047 | |
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1048 | Enables all logging levels, and changes the interpretation of following |
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1049 | level specifications to disable that level. Rarely used. |
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1050 | |
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1051 | Example: enable all logging levels except fatal and trace (this is rather |
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1052 | nonsensical). |
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1053 | |
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1054 | filter=exept,fatal,trace |
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1055 | |
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1056 | =item C<level> |
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1057 | |
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1058 | Enables all logging levels, and changes the interpretation of following |
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1059 | level specifications to be "that level or any higher priority |
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1060 | message". This is the default. |
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1061 | |
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1062 | Example: log anything at or above warn level. |
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1063 | |
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1064 | filter=warn |
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1065 | |
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1066 | # or, more verbose |
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1067 | filter=only,level,warn |
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1068 | |
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1069 | =item C<1>..C<9>, a logging level name (C<error>, C<debug> etc.) |
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1070 | |
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1071 | A numeric loglevel or the name of a loglevel will be interpreted according |
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1072 | to the most recent C<only>, C<except> or C<level> directive. By default, |
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1073 | specifying a logging level enables that and any higher priority messages. |
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1074 | |
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1075 | =item C<+>I<context> |
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1076 | |
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1077 | Adds/attaches the named context as slave to the context. |
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1078 | |
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1079 | =item C<+> |
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1080 | |
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1081 | A line C<+> clears the slave list form the context. Anonymous (C<%name>) |
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1082 | contexts have no slaves by default, but package contexts have the parent |
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1083 | context as slave by default. |
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1084 | |
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1085 | Example: log messages from My::Module to a file, do not send them to the |
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1086 | default log collector. |
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1087 | |
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1088 | My::Module=+,file=/tmp/mymodulelog |
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1089 | |
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1090 | =back |
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1091 | |
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1092 | =cut |
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1093 | |
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1094 | for (my $spec = $ENV{PERL_ANYEVENT_LOG}) { |
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1095 | my %anon; |
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1096 | |
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1097 | my $pkg = sub { |
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1098 | $_[0] eq "log" ? $LOG |
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1099 | : $_[0] eq "filter" ? $FILTER |
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1100 | : $_[0] eq "collect" ? $COLLECT |
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1101 | : $_[0] =~ /^%(.+)$/ && $anon{$1} ||= ctx undef |
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1102 | : $_[0] =~ /^(.*?)(?:::)?$/ && ctx "$1" # egad :/ |
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1103 | }; |
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1104 | |
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1105 | while (/\G((?:[^:=]+|::|\\.)+)=/gc) { |
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1106 | my $ctx = $pkg->($1); |
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1107 | my $level = "level"; |
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1108 | |
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1109 | while (/\G((?:[^,:[:space:]]+|::|\\.)+)/gc) { |
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1110 | for ("$1") { |
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1111 | if ($_ eq "stderr" ) { $ctx->log_to_warn; |
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1112 | } elsif (/^file=(.+)/ ) { $ctx->log_to_file ("$1"); |
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1113 | } elsif (/^path=(.+)/ ) { $ctx->log_to_path ("$1"); |
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1114 | } elsif (/syslog(?:=(.*))?/ ) { require Sys::Syslog; $ctx->log_to_syslog (eval "package Sys::Syslog; $1"); |
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1115 | } elsif ($_ eq "nolog" ) { $ctx->log_cb (undef); |
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1116 | } elsif (/^\+(.+)$/ ) { $ctx->attach ($pkg->("$1")); |
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1117 | } elsif ($_ eq "+" ) { $ctx->slaves; |
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1118 | } elsif ($_ eq "off" or $_ eq "0") { $ctx->level (0); |
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1119 | } elsif ($_ eq "all" ) { $ctx->level ("all"); |
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1120 | } elsif ($_ eq "level" ) { $ctx->level ("all"); $level = "level"; |
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1121 | } elsif ($_ eq "only" ) { $ctx->level ("off"); $level = "enable"; |
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1122 | } elsif ($_ eq "except" ) { $ctx->level ("all"); $level = "disable"; |
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1123 | } elsif (/^\d$/ ) { $ctx->$level ($_); |
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1124 | } elsif (exists $STR2LEVEL{$_} ) { $ctx->$level ($_); |
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1125 | } else { die "PERL_ANYEVENT_LOG ($spec): parse error at '$_'\n"; |
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1126 | } |
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1127 | } |
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1128 | |
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1129 | /\G,/gc or last; |
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1130 | } |
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1131 | |
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1132 | /\G[:[:space:]]/gc or last; |
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1133 | } |
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1134 | |
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1135 | if (/\G(.+)/g) { |
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1136 | die "PERL_ANYEVENT_LOG ($spec): parse error at '$1'\n"; |
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1137 | } |
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1138 | } |
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1139 | |
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1140 | 1; |
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1141 | |
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1142 | =head1 EXAMPLES |
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1143 | |
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1144 | This section shows some common configurations, both as code, and as |
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1145 | C<PERL_ANYEVENT_LOG> string. |
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1146 | |
|
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1147 | =over 4 |
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1148 | |
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1149 | =item Setting the global logging level. |
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1150 | |
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1151 | Either put C<PERL_ANYEVENT_VERBOSE=><number> into your environment before |
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1152 | running your program, use C<PERL_ANYEVENT_LOG> or modify the log level of |
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1153 | the root context at runtime: |
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1154 | |
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1155 | PERL_ANYEVENT_VERBOSE=5 ./myprog |
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1156 | |
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1157 | PERL_ANYEVENT_LOG=log=warn |
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1158 | |
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1159 | $AnyEvent::Log::FILTER->level ("warn"); |
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1160 | |
|
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1161 | =item Append all messages to a file instead of sending them to STDERR. |
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1162 | |
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1163 | This is affected by the global logging level. |
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1164 | |
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1165 | $AnyEvent::Log::LOG->log_to_file ($path); |
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1166 | |
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1167 | PERL_ANYEVENT_LOG=log=file=/some/path |
844 | |
1168 | |
845 | =item Write all messages with priority C<error> and higher to a file. |
1169 | =item Write all messages with priority C<error> and higher to a file. |
846 | |
1170 | |
847 | This writes them only when the global logging level allows it, because |
1171 | This writes them only when the global logging level allows it, because |
848 | it is attached to the default context which is invoked I<after> global |
1172 | it is attached to the default context which is invoked I<after> global |
849 | filtering. |
1173 | filtering. |
850 | |
1174 | |
851 | open my $fh, ">>", $path |
1175 | $AnyEvent::Log::FILTER->attach |
852 | or die "$path: $!"; |
1176 | new AnyEvent::Log::Ctx log_to_file => $path); |
853 | |
1177 | |
854 | $AnyEvent::Log::Default->attach (new AnyEvent::Log::Ctx |
1178 | PERL_ANYEVENT_LOG=filter=+%filelogger:%filelogger=file=/some/path |
855 | log_cb => sub { syswrite $fh, shift; 0 }); |
|
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856 | |
1179 | |
857 | This writes them regardless of the global logging level, because it is |
1180 | This writes them regardless of the global logging level, because it is |
858 | attached to the toplevel context, which receives all messages I<before> |
1181 | attached to the toplevel context, which receives all messages I<before> |
859 | the global filtering. |
1182 | the global filtering. |
860 | |
1183 | |
861 | $AnyEvent::Log::Top->attach (new AnyEvent::Log::Ctx |
1184 | $AnyEvent::Log::COLLECT->attach ( |
862 | log_cb => sub { syswrite $fh, shift; 0 }); |
1185 | new AnyEvent::Log::Ctx log_to_file => $path); |
863 | |
1186 | |
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1187 | PERL_ANYEVENT_LOG=%filelogger=file=/some/path:collect=+%filelogger |
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1188 | |
864 | In both cases, messages are still written to STDOUT. |
1189 | In both cases, messages are still written to STDERR. |
865 | |
1190 | |
866 | =item Write trace messages (only) from L<AnyEvent::Debug> to the default logging target(s). |
1191 | =item Write trace messages (only) from L<AnyEvent::Debug> to the default logging target(s). |
867 | |
1192 | |
868 | Attach the CyAnyEvent::Log::Default> context to the C<AnyEvent::Debug> |
1193 | Attach the C<$AnyEvent::Log::LOG> context to the C<AnyEvent::Debug> |
869 | context and increase the C<AnyEvent::Debug> logging level - this simply |
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870 | circumvents the global filtering for trace messages. |
1194 | context - this simply circumvents the global filtering for trace messages. |
871 | |
1195 | |
872 | my $debug = AnyEvent::Debug->AnyEvent::Log::ctx; |
1196 | my $debug = AnyEvent::Debug->AnyEvent::Log::ctx; |
873 | $debug->attach ($AnyEvent::Log::Default); |
1197 | $debug->attach ($AnyEvent::Log::LOG); |
874 | $debug->levels ("trace"); # not "level"! |
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875 | |
1198 | |
876 | This of course works for any package. |
1199 | PERL_ANYEVENT_LOG=AnyEvent::Debug=+log |
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1200 | |
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1201 | This of course works for any package, not just L<AnyEvent::Debug>, but |
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|
1202 | assumes the log level for AnyEvent::Debug hasn't been changed from the |
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1203 | default. |
877 | |
1204 | |
878 | =back |
1205 | =back |
879 | |
1206 | |
880 | =head1 AUTHOR |
1207 | =head1 AUTHOR |
881 | |
1208 | |
882 | Marc Lehmann <schmorp@schmorp.de> |
1209 | Marc Lehmann <schmorp@schmorp.de> |
883 | http://home.schmorp.de/ |
1210 | http://home.schmorp.de/ |
884 | |
1211 | |
885 | =cut |
1212 | =cut |
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1213 | |