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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 | |
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61 | The module is also usable before AnyEvent itself is initialised, in which |
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62 | case some of the functionality might be reduced. |
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63 | |
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64 | The amount of documentation might indicate otherwise, but the runtime part |
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65 | of the module is still just below 300 lines of code. |
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66 | |
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67 | =head1 LOGGING LEVELS |
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68 | |
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69 | Logging levels in this module range from C<1> (highest priority) to C<9> |
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70 | (lowest priority). Note that the lowest numerical value is the highest |
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71 | priority, so when this document says "higher priority" it means "lower |
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72 | numerical value". |
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73 | |
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74 | Instead of specifying levels by name you can also specify them by aliases: |
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75 | |
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76 | LVL NAME SYSLOG PERL NOTE |
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77 | 1 fatal emerg exit aborts program! |
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78 | 2 alert |
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79 | 3 critical crit |
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80 | 4 error err die |
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81 | 5 warn warning |
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82 | 6 note notice |
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83 | 7 info |
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84 | 8 debug |
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85 | 9 trace |
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86 | |
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87 | As you can see, some logging levels have multiple aliases - the first one |
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88 | is the "official" name, the second one the "syslog" name (if it differs) |
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89 | and the third one the "perl" name, suggesting that you log C<die> messages |
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90 | at C<error> priority. |
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91 | |
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92 | You can normally only log a single message at highest priority level |
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93 | (C<1>, C<fatal>), because logging a fatal message will also quit the |
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94 | program - so use it sparingly :) |
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95 | |
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96 | Some methods also offer some extra levels, such as C<0>, C<off>, C<none> |
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97 | or C<all> - these are only valid in the methods they are documented for. |
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98 | |
62 | =head1 LOGGING FUNCTIONS |
99 | =head1 LOGGING FUNCTIONS |
63 | |
100 | |
64 | These functions allow you to log messages. They always use the caller's |
101 | These functions allow you to log messages. They always use the caller's |
65 | package as a "logging module/source". Also, the main logging function is |
102 | package as a "logging context". Also, the main logging function C<log> is |
66 | callable as C<AnyEvent::log> or C<AE::log> when the C<AnyEvent> module is |
103 | callable as C<AnyEvent::log> or C<AE::log> when the C<AnyEvent> module is |
67 | loaded. |
104 | loaded. |
68 | |
105 | |
69 | =over 4 |
106 | =over 4 |
70 | |
107 | |
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74 | |
111 | |
75 | use Carp (); |
112 | use Carp (); |
76 | use POSIX (); |
113 | use POSIX (); |
77 | |
114 | |
78 | use AnyEvent (); BEGIN { AnyEvent::common_sense } |
115 | use AnyEvent (); BEGIN { AnyEvent::common_sense } |
79 | use AnyEvent::Util (); |
116 | #use AnyEvent::Util (); need to load this in a delayed fashion, as it uses AE::log |
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117 | |
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118 | our $VERSION = $AnyEvent::VERSION; |
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119 | |
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120 | our ($COLLECT, $FILTER, $LOG); |
80 | |
121 | |
81 | our ($now_int, $now_str1, $now_str2); |
122 | our ($now_int, $now_str1, $now_str2); |
82 | |
123 | |
83 | # Format Time, not public - yet? |
124 | # Format Time, not public - yet? |
84 | sub ft($) { |
125 | sub ft($) { |
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89 | if $now_int != $i; |
130 | if $now_int != $i; |
90 | |
131 | |
91 | "$now_str1$f$now_str2" |
132 | "$now_str1$f$now_str2" |
92 | } |
133 | } |
93 | |
134 | |
94 | our %CTX; # all logging contexts |
135 | our %CTX; # all package contexts |
95 | |
136 | |
96 | # creates a default package context object for the given package |
137 | # creates a default package context object for the given package |
97 | sub _pkg_ctx($) { |
138 | sub _pkg_ctx($) { |
98 | my $ctx = bless [$_[0], (1 << 10) - 1 - 1, {}], "AnyEvent::Log::Ctx"; |
139 | my $ctx = bless [$_[0], (1 << 10) - 1 - 1, {}], "AnyEvent::Log::Ctx"; |
99 | |
140 | |
100 | # link "parent" package |
141 | # link "parent" package |
101 | my $pkg = $_[0] =~ /^(.+)::/ ? $1 : "AE::Log::Top"; |
142 | my $parent = $_[0] =~ /^(.+)::/ |
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143 | ? $CTX{$1} ||= &_pkg_ctx ("$1") |
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144 | : $COLLECT; |
102 | |
145 | |
103 | $pkg = $CTX{$pkg} ||= &_pkg_ctx ($pkg); |
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104 | $ctx->[2]{$pkg+0} = $pkg; |
146 | $ctx->[2]{$parent+0} = $parent; |
105 | |
147 | |
106 | $ctx |
148 | $ctx |
107 | } |
149 | } |
108 | |
150 | |
109 | =item AnyEvent::Log::log $level, $msg[, @args] |
151 | =item AnyEvent::Log::log $level, $msg[, @args] |
110 | |
152 | |
111 | Requests logging of the given C<$msg> with the given log level (1..9). |
153 | Requests logging of the given C<$msg> with the given log level, and |
112 | You can also use the following strings as log level: C<fatal> (1), |
154 | returns true if the message was logged I<somewhere>. |
113 | C<alert> (2), C<critical> (3), C<error> (4), C<warn> (5), C<note> (6), |
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114 | C<info> (7), C<debug> (8), C<trace> (9). |
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115 | |
155 | |
116 | For C<fatal> log levels, the program will abort. |
156 | For C<fatal> log levels, the program will abort. |
117 | |
157 | |
118 | If only a C<$msg> is given, it is logged as-is. With extra C<@args>, the |
158 | If only a C<$msg> is given, it is logged as-is. With extra C<@args>, the |
119 | C<$msg> is interpreted as an sprintf format string. |
159 | C<$msg> is interpreted as an sprintf format string. |
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125 | supposed to return the message. It will be called only then the message |
165 | supposed to return the message. It will be called only then the message |
126 | actually gets logged, which is useful if it is costly to create the |
166 | actually gets logged, which is useful if it is costly to create the |
127 | message in the first place. |
167 | message in the first place. |
128 | |
168 | |
129 | Whether the given message will be logged depends on the maximum log level |
169 | Whether the given message will be logged depends on the maximum log level |
130 | and the caller's package. |
170 | and the caller's package. The return value can be used to ensure that |
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171 | messages or not "lost" - for example, when L<AnyEvent::Debug> detects a |
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172 | runtime error it tries to log it at C<die> level, but if that message is |
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173 | lost it simply uses warn. |
131 | |
174 | |
132 | Note that you can (and should) call this function as C<AnyEvent::log> or |
175 | Note that you can (and should) call this function as C<AnyEvent::log> or |
133 | C<AE::log>, without C<use>-ing this module if possible (i.e. you don't |
176 | C<AE::log>, without C<use>-ing this module if possible (i.e. you don't |
134 | need any additional functionality), as those functions will load the |
177 | need any additional functionality), as those functions will load the |
135 | logging module on demand only. They are also much shorter to write. |
178 | logging module on demand only. They are also much shorter to write. |
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152 | |
195 | |
153 | =cut |
196 | =cut |
154 | |
197 | |
155 | # also allow syslog equivalent names |
198 | # also allow syslog equivalent names |
156 | our %STR2LEVEL = ( |
199 | our %STR2LEVEL = ( |
157 | fatal => 1, emerg => 1, |
200 | fatal => 1, emerg => 1, exit => 1, |
158 | alert => 2, |
201 | alert => 2, |
159 | critical => 3, crit => 3, |
202 | critical => 3, crit => 3, |
160 | error => 4, err => 4, |
203 | error => 4, err => 4, die => 4, |
161 | warn => 5, warning => 5, |
204 | warn => 5, warning => 5, |
162 | note => 6, notice => 6, |
205 | note => 6, notice => 6, |
163 | info => 7, |
206 | info => 7, |
164 | debug => 8, |
207 | debug => 8, |
165 | trace => 9, |
208 | trace => 9, |
166 | ); |
209 | ); |
167 | |
210 | |
168 | sub now () { time } |
211 | our $TIME_EXACT; |
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212 | |
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213 | sub exact_time($) { |
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214 | $TIME_EXACT = shift; |
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215 | *_ts = $AnyEvent::MODEL |
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216 | ? $TIME_EXACT ? \&AE::now : \&AE::time |
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217 | : sub () { $TIME_EXACT ? do { require Time::HiRes; Time::HiRes::time () } : time }; |
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218 | } |
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219 | |
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220 | BEGIN { |
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221 | exact_time 0; |
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222 | } |
169 | |
223 | |
170 | AnyEvent::post_detect { |
224 | AnyEvent::post_detect { |
171 | *now = \&AE::now; |
225 | exact_time $TIME_EXACT; |
172 | }; |
226 | }; |
173 | |
227 | |
174 | our @LEVEL2STR = qw(0 fatal alert crit error warn note info debug trace); |
228 | our @LEVEL2STR = qw(0 fatal alert crit error warn note info debug trace); |
175 | |
229 | |
176 | # time, ctx, level, msg |
230 | # time, ctx, level, msg |
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195 | ? $level+0 |
249 | ? $level+0 |
196 | : $STR2LEVEL{$level} || Carp::croak "$level: not a valid logging level, caught"; |
250 | : $STR2LEVEL{$level} || Carp::croak "$level: not a valid logging level, caught"; |
197 | |
251 | |
198 | my $mask = 1 << $level; |
252 | my $mask = 1 << $level; |
199 | |
253 | |
200 | my (%seen, @ctx, $now, $fmt); |
254 | my ($success, %seen, @ctx, $now, $fmt); |
201 | |
255 | |
202 | do |
256 | do |
203 | { |
257 | { |
204 | # skip if masked |
258 | # skip if masked |
205 | if ($ctx->[1] & $mask && !$seen{$ctx+0}++) { |
259 | if ($ctx->[1] & $mask && !$seen{$ctx+0}++) { |
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209 | # now get raw message, unless we have it already |
263 | # now get raw message, unless we have it already |
210 | unless ($now) { |
264 | unless ($now) { |
211 | $format = $format->() if ref $format; |
265 | $format = $format->() if ref $format; |
212 | $format = sprintf $format, @args if @args; |
266 | $format = sprintf $format, @args if @args; |
213 | $format =~ s/\n$//; |
267 | $format =~ s/\n$//; |
214 | $now = AE::now; |
268 | $now = _ts; |
215 | }; |
269 | }; |
216 | |
270 | |
217 | # format msg |
271 | # format msg |
218 | my $str = $ctx->[4] |
272 | my $str = $ctx->[4] |
219 | ? $ctx->[4]($now, $_[0], $level, $format) |
273 | ? $ctx->[4]($now, $_[0], $level, $format) |
220 | : $fmt ||= _format $now, $_[0], $level, $format; |
274 | : ($fmt ||= _format $now, $_[0], $level, $format); |
221 | |
275 | |
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276 | $success = 1; |
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277 | |
222 | $ctx->[3]($str); |
278 | $ctx->[3]($str) |
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279 | or push @ctx, values %{ $ctx->[2] }; # not consumed - propagate |
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280 | } else { |
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281 | push @ctx, values %{ $ctx->[2] }; # not masked - propagate |
223 | } |
282 | } |
224 | |
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225 | # not masked, not consumed - propagate to parent contexts |
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226 | push @ctx, values %{ $ctx->[2] }; |
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227 | } |
283 | } |
228 | } |
284 | } |
229 | while $ctx = pop @ctx; |
285 | while $ctx = pop @ctx; |
230 | |
286 | |
231 | exit 1 if $level <= 1; |
287 | exit 1 if $level <= 1; |
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288 | |
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289 | $success |
232 | } |
290 | } |
233 | |
291 | |
234 | sub log($$;@) { |
292 | sub log($$;@) { |
235 | _log |
293 | _log |
236 | $CTX{ (caller)[0] } ||= _pkg_ctx +(caller)[0], |
294 | $CTX{ (caller)[0] } ||= _pkg_ctx +(caller)[0], |
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240 | *AnyEvent::log = *AE::log = \&log; |
298 | *AnyEvent::log = *AE::log = \&log; |
241 | |
299 | |
242 | =item $logger = AnyEvent::Log::logger $level[, \$enabled] |
300 | =item $logger = AnyEvent::Log::logger $level[, \$enabled] |
243 | |
301 | |
244 | Creates a code reference that, when called, acts as if the |
302 | Creates a code reference that, when called, acts as if the |
245 | C<AnyEvent::Log::log> function was called at this point with the givne |
303 | C<AnyEvent::Log::log> function was called at this point with the given |
246 | level. C<$logger> is passed a C<$msg> and optional C<@args>, just as with |
304 | level. C<$logger> is passed a C<$msg> and optional C<@args>, just as with |
247 | the C<AnyEvent::Log::log> function: |
305 | the C<AnyEvent::Log::log> function: |
248 | |
306 | |
249 | my $debug_log = AnyEvent::Log::logger "debug"; |
307 | my $debug_log = AnyEvent::Log::logger "debug"; |
250 | |
308 | |
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275 | # and later in your program |
333 | # and later in your program |
276 | $debug_log->("yo, stuff here") if $debug; |
334 | $debug_log->("yo, stuff here") if $debug; |
277 | |
335 | |
278 | $debug and $debug_log->("123"); |
336 | $debug and $debug_log->("123"); |
279 | |
337 | |
280 | Note: currently the enabled var is always true - that will be fixed in a |
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281 | future version :) |
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282 | |
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283 | =cut |
338 | =cut |
284 | |
339 | |
285 | our %LOGGER; |
340 | our %LOGGER; |
286 | |
341 | |
287 | # re-assess logging status for all loggers |
342 | # re-assess logging status for all loggers |
288 | sub _reassess { |
343 | sub _reassess { |
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344 | local $SIG{__DIE__}; |
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345 | my $die = sub { die }; |
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346 | |
289 | for (@_ ? $LOGGER{$_[0]} : values %LOGGER) { |
347 | for (@_ ? $LOGGER{$_[0]} : values %LOGGER) { |
290 | my ($ctx, $level, $renabled) = @$_; |
348 | my ($ctx, $level, $renabled) = @$_; |
291 | |
349 | |
292 | # to detect whether a message would be logged, we # actually |
350 | # to detect whether a message would be logged, we actually |
293 | # try to log one and die. this isn't fast, but we can be |
351 | # try to log one and die. this isn't fast, but we can be |
294 | # sure that the logging decision is correct :) |
352 | # sure that the logging decision is correct :) |
295 | |
353 | |
296 | $$renabled = !eval { |
354 | $$renabled = !eval { |
297 | local $SIG{__DIE__}; |
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298 | |
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299 | _log $ctx, $level, sub { die }; |
355 | _log $ctx, $level, $die; |
300 | |
356 | |
301 | 1 |
357 | 1 |
302 | }; |
358 | }; |
303 | |
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304 | $$renabled = 1; # TODO |
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305 | } |
359 | } |
306 | } |
360 | } |
307 | |
361 | |
308 | sub _logger($;$) { |
362 | sub _logger { |
309 | my ($ctx, $level, $renabled) = @_; |
363 | my ($ctx, $level, $renabled) = @_; |
310 | |
364 | |
311 | $renabled ||= \my $enabled; |
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312 | |
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313 | $$renabled = 1; |
365 | $$renabled = 1; |
314 | |
366 | |
315 | my $logger = [$ctx, $level, $renabled]; |
367 | my $logger = [$ctx, $level, $renabled]; |
316 | |
368 | |
317 | $LOGGER{$logger+0} = $logger; |
369 | $LOGGER{$logger+0} = $logger; |
318 | |
370 | |
319 | _reassess $logger+0; |
371 | _reassess $logger+0; |
320 | |
372 | |
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373 | require AnyEvent::Util; |
321 | my $guard = AnyEvent::Util::guard { |
374 | my $guard = AnyEvent::Util::guard (sub { |
322 | # "clean up" |
375 | # "clean up" |
323 | delete $LOGGER{$logger+0}; |
376 | delete $LOGGER{$logger+0}; |
324 | }; |
377 | }); |
325 | |
378 | |
326 | sub { |
379 | sub { |
327 | $guard if 0; # keep guard alive, but don't cause runtime overhead |
380 | $guard if 0; # keep guard alive, but don't cause runtime overhead |
328 | |
381 | |
329 | _log $ctx, $level, @_ |
382 | _log $ctx, $level, @_ |
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334 | sub logger($;$) { |
387 | sub logger($;$) { |
335 | _logger |
388 | _logger |
336 | $CTX{ (caller)[0] } ||= _pkg_ctx +(caller)[0], |
389 | $CTX{ (caller)[0] } ||= _pkg_ctx +(caller)[0], |
337 | @_ |
390 | @_ |
338 | } |
391 | } |
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392 | |
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393 | =item AnyEvent::Log::exact_time $on |
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394 | |
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395 | By default, C<AnyEvent::Log> will use C<AE::now>, i.e. the cached |
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396 | eventloop time, for the log timestamps. After calling this function with a |
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397 | true value it will instead resort to C<AE::time>, i.e. fetch the current |
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398 | time on each log message. This only makes a difference for event loops |
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399 | that actually cache the time (such as L<EV> or L<AnyEvent::Loop>). |
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400 | |
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401 | Since C<AnyEvent::Log> has to work even before the L<AnyEvent> has been |
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402 | initialised, this switch will also decide whether to use C<CORE::time> or |
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403 | C<Time::HiRes::time> when logging a message before L<AnyEvent> becomes |
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404 | available. |
339 | |
405 | |
340 | =back |
406 | =back |
341 | |
407 | |
342 | =head1 LOGGING CONTEXTS |
408 | =head1 LOGGING CONTEXTS |
343 | |
409 | |
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356 | timestamp, context, level and string message and formats it in the way |
422 | timestamp, context, level and string message and formats it in the way |
357 | it should be logged) and a logging callback (which is responsible for |
423 | it should be logged) and a logging callback (which is responsible for |
358 | actually logging the formatted message and telling C<AnyEvent::Log> |
424 | actually logging the formatted message and telling C<AnyEvent::Log> |
359 | whether it has consumed the message, or whether it should be propagated). |
425 | whether it has consumed the message, or whether it should be propagated). |
360 | |
426 | |
361 | For propagation, a context can have any number of attached I<parent |
427 | For propagation, a context can have any number of attached I<slave |
362 | contexts>. Any message that is neither masked by the logging mask nor |
428 | contexts>. Any message that is neither masked by the logging mask nor |
363 | masked by the logging callback returning true will be passed to all parent |
429 | masked by the logging callback returning true will be passed to all slave |
364 | contexts. |
430 | contexts. |
365 | |
431 | |
366 | Each call to a logging function will log the message at most once per |
432 | Each call to a logging function will log the message at most once per |
367 | context, so it does not matter (much) if there are cycles or if the |
433 | context, so it does not matter (much) if there are cycles or if the |
368 | message can arrive at the same context via multiple paths. |
434 | message can arrive at the same context via multiple paths. |
… | |
… | |
372 | By default, all logging contexts have an full set of log levels ("all"), a |
438 | By default, all logging contexts have an full set of log levels ("all"), a |
373 | disabled logging callback and the default formatting callback. |
439 | disabled logging callback and the default formatting callback. |
374 | |
440 | |
375 | Package contexts have the package name as logging title by default. |
441 | Package contexts have the package name as logging title by default. |
376 | |
442 | |
377 | They have exactly one parent - the context of the "parent" package. The |
443 | They have exactly one slave - the context of the "parent" package. The |
378 | parent package is simply defined to be the package name without the last |
444 | parent package is simply defined to be the package name without the last |
379 | component, i.e. C<AnyEvent::Debug::Wrapped> becomes C<AnyEvent::Debug>, |
445 | component, i.e. C<AnyEvent::Debug::Wrapped> becomes C<AnyEvent::Debug>, |
380 | and C<AnyEvent> becomes ... C<AnyEvent::Log::Top> which is the |
446 | and C<AnyEvent> becomes ... C<$AnyEvent::Log::COLLECT> which is the |
381 | exception of the rule - just like the parent of any package name in |
447 | exception of the rule - just like the "parent" of any single-component |
382 | Perl is C<main>, the default parent of any top-level package context is |
448 | package name in Perl is C<main>, the default slave of any top-level |
383 | C<AnyEvent::Log::Top>. |
449 | package context is C<$AnyEvent::Log::COLLECT>. |
384 | |
450 | |
385 | Since perl packages form only an approximate hierarchy, this parent |
451 | Since perl packages form only an approximate hierarchy, this slave |
386 | context can of course be removed. |
452 | context can of course be removed. |
387 | |
453 | |
388 | All other (anonymous) contexts have no parents and an empty title by |
454 | All other (anonymous) contexts have no slaves and an empty title by |
389 | default. |
455 | default. |
390 | |
456 | |
391 | When the module is loaded it creates the default context called |
457 | When the module is loaded it creates the C<$AnyEvent::Log::LOG> logging |
392 | C<AnyEvent::Log::Default> (also stored in C<$AnyEvent::Log::Default>), |
458 | context that simply logs everything via C<warn>, without propagating |
393 | which simply logs everything to STDERR and doesn't propagate anything |
|
|
394 | anywhere by default. The purpose of the default context is to provide |
459 | anything anywhere by default. The purpose of this context is to provide |
395 | a convenient place to override the global logging target or to attach |
460 | a convenient place to override the global logging target or to attach |
396 | additional log targets. It's not meant for filtering. |
461 | additional log targets. It's not meant for filtering. |
397 | |
462 | |
398 | It then creates the root context called C<AnyEvent::Log::Root> (also |
463 | It then creates the C<$AnyEvent::Log::FILTER> context whose |
399 | stored in C<$AnyEvent::Log::Root>) and sets its log level set to all |
464 | purpose is to suppress all messages with priority higher |
400 | levels up to the one specified by C<$ENV{PERL_ANYEVENT_VERBOSE}>. It |
465 | than C<$ENV{PERL_ANYEVENT_VERBOSE}>. It then attached the |
401 | then attached the default logging context to it. The purpose of the root |
466 | C<$AnyEvent::Log::LOG> context to it. The purpose of the filter context |
402 | context is to simply provide filtering according to some global log level. |
467 | is to simply provide filtering according to some global log level. |
403 | |
468 | |
404 | Finally it creates the top-level package context called |
469 | Finally it creates the top-level package context C<$AnyEvent::Log::COLLECT> |
405 | C<AnyEvent::Log::Top> (also stored in, you might have guessed, |
470 | and attaches the C<$AnyEvent::Log::FILTER> context to it, but otherwise |
406 | C<$AnyEvent::Log::Top>) and attached the root context but otherwise leaves |
|
|
407 | it at default config. It's purpose is simply to collect all log messages |
471 | leaves it at default config. Its purpose is simply to collect all log |
408 | system-wide. |
472 | messages system-wide. |
409 | |
473 | |
410 | These three special contexts can also be referred to by the |
474 | The hierarchy is then: |
411 | package/context names C<AE::Log::Default>, C<AE::Log::Root> and |
|
|
412 | C<AE::Log::Top>. |
|
|
413 | |
475 | |
|
|
476 | any package, eventually -> $COLLECT -> $FILTER -> $LOG |
|
|
477 | |
414 | The effect of all this is that log messages, by default, wander up |
478 | The effect of all this is that log messages, by default, wander up to the |
415 | to the root context where log messages with lower priority then |
479 | C<$AnyEvent::Log::COLLECT> context where all messages normally end up, |
|
|
480 | from there to C<$AnyEvent::Log::FILTER> where log messages with lower |
416 | C<$ENV{PERL_ANYEVENT_VERBOSE}> will be filtered away and then to the |
481 | priority then C<$ENV{PERL_ANYEVENT_VERBOSE}> will be filtered out and then |
417 | AnyEvent::Log::Default context to be logged to STDERR. |
482 | to the C<$AnyEvent::Log::LOG> context to be passed to C<warn>. |
418 | |
483 | |
419 | Splitting the top level context into three contexts makes it easy to set |
484 | This makes it easy to set a global logging level (by modifying $FILTER), |
420 | a global logging level (by modifying the root context), but still allow |
485 | but still allow other contexts to send, for example, their debug and trace |
421 | other contexts to log, for example, their debug and trace messages to the |
|
|
422 | default target despite the global logging level, or to attach additional |
486 | messages to the $LOG target despite the global logging level, or to attach |
423 | log targets that log messages, regardless of the global logging level. |
487 | additional log targets that log messages, regardless of the global logging |
|
|
488 | level. |
424 | |
489 | |
425 | It also makes it easy to replace the default STDERR-logger by something |
490 | It also makes it easy to modify the default warn-logger ($LOG) to |
426 | that logs to a file, or to attach additional logging targets. |
491 | something that logs to a file, or to attach additional logging targets |
|
|
492 | (such as loggign to a file) by attaching it to $FILTER. |
427 | |
493 | |
428 | =head2 CREATING/FINDING/DESTROYING CONTEXTS |
494 | =head2 CREATING/FINDING/DESTROYING CONTEXTS |
429 | |
495 | |
430 | =over 4 |
496 | =over 4 |
431 | |
497 | |
… | |
… | |
453 | : bless [undef, (1 << 10) - 1 - 1], "AnyEvent::Log::Ctx" |
519 | : bless [undef, (1 << 10) - 1 - 1], "AnyEvent::Log::Ctx" |
454 | } |
520 | } |
455 | |
521 | |
456 | =item AnyEvent::Log::reset |
522 | =item AnyEvent::Log::reset |
457 | |
523 | |
458 | Deletes all contexts and recreates the default hierarchy, i.e. resets the |
524 | Resets all package contexts and recreates the default hierarchy if |
459 | logging subsystem to defaults. |
525 | necessary, i.e. resets the logging subsystem to defaults, as much as |
|
|
526 | possible. This process keeps references to contexts held by other parts of |
|
|
527 | the program intact. |
460 | |
528 | |
461 | This can be used to implement config-file (re-)loading: before loading a |
529 | This can be used to implement config-file (re-)loading: before loading a |
462 | configuration, reset all contexts. |
530 | configuration, reset all contexts. |
463 | |
531 | |
464 | =cut |
532 | =cut |
465 | |
533 | |
466 | sub reset { |
534 | sub reset { |
467 | @$_ = () for values %CTX; # just to be sure - to kill circular logging dependencies |
535 | # hard to kill complex data structures |
468 | %CTX = (); |
536 | # we "recreate" all package loggers and reset the hierarchy |
|
|
537 | while (my ($k, $v) = each %CTX) { |
|
|
538 | @$v = ($k, (1 << 10) - 1 - 1, { }); |
469 | |
539 | |
470 | my $default = ctx undef; |
540 | $v->attach ($k =~ /^(.+)::/ ? $CTX{$1} : $AnyEvent::Log::COLLECT); |
471 | $default->title ("AnyEvent::Log::Default"); |
|
|
472 | $default->log_cb (sub { |
|
|
473 | print STDERR shift; |
|
|
474 | 0 |
|
|
475 | }); |
541 | } |
476 | $AnyEvent::Log::Default = $CTX{"AnyEvent::Log::Default"} = $CTX{"AE::Log::Default"} = $default; |
|
|
477 | |
542 | |
478 | my $root = ctx undef; |
543 | @$_ = ($_->[0], (1 << 10) - 1 - 1) |
|
|
544 | for $LOG, $FILTER, $COLLECT; |
|
|
545 | |
|
|
546 | #$LOG->slaves; |
479 | $root->title ("AnyEvent::Log::Root"); |
547 | $LOG->title ('$AnyEvent::Log::LOG'); |
|
|
548 | $LOG->log_to_warn; |
|
|
549 | |
|
|
550 | $FILTER->slaves ($LOG); |
|
|
551 | $FILTER->title ('$AnyEvent::Log::FILTER'); |
480 | $root->level ($AnyEvent::VERBOSE); |
552 | $FILTER->level ($AnyEvent::VERBOSE); |
481 | $root->attach ($default); |
|
|
482 | $AnyEvent::Log::Root = $CTX{"AnyEvent::Log::Root"} = $CTX{"AE::Log::Root"} = $root; |
|
|
483 | |
553 | |
484 | my $top = ctx undef; |
554 | $COLLECT->slaves ($FILTER); |
485 | $top->title ("AnyEvent::Log::Top"); |
555 | $COLLECT->title ('$AnyEvent::Log::COLLECT'); |
486 | $top->attach ($root); |
556 | |
487 | $AnyEvent::Log::Top = $CTX{"AnyEvent::Log::Top"} = $CTX{"AE::Log::Top"} = $top; |
557 | _reassess; |
488 | } |
558 | } |
|
|
559 | |
|
|
560 | # create the default logger contexts |
|
|
561 | $LOG = ctx undef; |
|
|
562 | $FILTER = ctx undef; |
|
|
563 | $COLLECT = ctx undef; |
489 | |
564 | |
490 | AnyEvent::Log::reset; |
565 | AnyEvent::Log::reset; |
491 | |
566 | |
492 | # hello, CPAN, please catch me |
567 | # hello, CPAN, please catch me |
493 | package AnyEvent::Log::Default; |
|
|
494 | package AE::Log::Default; |
|
|
495 | package AnyEvent::Log::Root; |
|
|
496 | package AE::Log::Root; |
|
|
497 | package AnyEvent::Log::Top; |
568 | package AnyEvent::Log::LOG; |
498 | package AE::Log::Top; |
569 | package AE::Log::LOG; |
|
|
570 | package AnyEvent::Log::FILTER; |
|
|
571 | package AE::Log::FILTER; |
|
|
572 | package AnyEvent::Log::COLLECT; |
|
|
573 | package AE::Log::COLLECT; |
499 | |
574 | |
500 | package AnyEvent::Log::Ctx; |
575 | package AnyEvent::Log::Ctx; |
501 | |
576 | |
502 | # 0 1 2 3 4 |
577 | # 0 1 2 3 4 |
503 | # [$title, $level, %$parents, &$logcb, &$fmtcb] |
578 | # [$title, $level, %$slaves, &$logcb, &$fmtcb] |
504 | |
579 | |
505 | =item $ctx = new AnyEvent::Log::Ctx methodname => param... |
580 | =item $ctx = new AnyEvent::Log::Ctx methodname => param... |
506 | |
581 | |
507 | This is a convenience constructor that makes it simpler to construct |
582 | This is a convenience constructor that makes it simpler to construct |
508 | anonymous logging contexts. |
583 | anonymous logging contexts. |
… | |
… | |
511 | name as the key with the value as parameter, unless the value is an |
586 | name as the key with the value as parameter, unless the value is an |
512 | arrayref, in which case it calls the method with the contents of the |
587 | arrayref, in which case it calls the method with the contents of the |
513 | array. The methods are called in the same order as specified. |
588 | array. The methods are called in the same order as specified. |
514 | |
589 | |
515 | Example: create a new logging context and set both the default logging |
590 | Example: create a new logging context and set both the default logging |
516 | level, some parent contexts and a logging callback. |
591 | level, some slave contexts and a logging callback. |
517 | |
592 | |
518 | $ctx = new AnyEvent::Log::Ctx |
593 | $ctx = new AnyEvent::Log::Ctx |
519 | title => "dubious messages", |
594 | title => "dubious messages", |
520 | level => "error", |
595 | level => "error", |
521 | log_cb => sub { print STDOUT shift; 0 }, |
596 | log_cb => sub { print STDOUT shift; 0 }, |
522 | parents => [$ctx1, $ctx, $ctx2], |
597 | slaves => [$ctx1, $ctx, $ctx2], |
523 | ; |
598 | ; |
524 | |
599 | |
525 | =back |
600 | =back |
526 | |
601 | |
527 | =cut |
602 | =cut |
… | |
… | |
640 | AnyEvent::Log::_reassess; |
715 | AnyEvent::Log::_reassess; |
641 | } |
716 | } |
642 | |
717 | |
643 | =back |
718 | =back |
644 | |
719 | |
645 | =head3 PARENT CONTEXTS |
720 | =head3 SLAVE CONTEXTS |
646 | |
721 | |
647 | The following methods attach and detach another logging context to a |
722 | The following methods attach and detach another logging context to a |
648 | logging context. |
723 | logging context. |
649 | |
724 | |
650 | Log messages are propagated to all parent contexts, unless the logging |
725 | Log messages are propagated to all slave contexts, unless the logging |
651 | callback consumes the message. |
726 | callback consumes the message. |
652 | |
727 | |
653 | =over 4 |
728 | =over 4 |
654 | |
729 | |
655 | =item $ctx->attach ($ctx2[, $ctx3...]) |
730 | =item $ctx->attach ($ctx2[, $ctx3...]) |
656 | |
731 | |
657 | Attaches the given contexts as parents to this context. It is not an error |
732 | Attaches the given contexts as slaves to this context. It is not an error |
658 | to add a context twice (the second add will be ignored). |
733 | to add a context twice (the second add will be ignored). |
659 | |
734 | |
660 | A context can be specified either as package name or as a context object. |
735 | A context can be specified either as package name or as a context object. |
661 | |
736 | |
662 | =item $ctx->detach ($ctx2[, $ctx3...]) |
737 | =item $ctx->detach ($ctx2[, $ctx3...]) |
663 | |
738 | |
664 | Removes the given parents from this context - it's not an error to attempt |
739 | Removes the given slaves from this context - it's not an error to attempt |
665 | to remove a context that hasn't been added. |
740 | to remove a context that hasn't been added. |
666 | |
741 | |
667 | A context can be specified either as package name or as a context object. |
742 | A context can be specified either as package name or as a context object. |
668 | |
743 | |
669 | =item $ctx->parents ($ctx2[, $ctx3...]) |
744 | =item $ctx->slaves ($ctx2[, $ctx3...]) |
670 | |
745 | |
671 | Replaces all parents attached to this context by the ones given. |
746 | Replaces all slaves attached to this context by the ones given. |
672 | |
747 | |
673 | =cut |
748 | =cut |
674 | |
749 | |
675 | sub attach { |
750 | sub attach { |
676 | my $ctx = shift; |
751 | my $ctx = shift; |
… | |
… | |
684 | |
759 | |
685 | delete $ctx->[2]{$_+0} |
760 | delete $ctx->[2]{$_+0} |
686 | for map { AnyEvent::Log::ctx $_ } @_; |
761 | for map { AnyEvent::Log::ctx $_ } @_; |
687 | } |
762 | } |
688 | |
763 | |
689 | sub parents { |
764 | sub slaves { |
690 | undef $_[0][2]; |
765 | undef $_[0][2]; |
691 | &attach; |
766 | &attach; |
692 | } |
767 | } |
693 | |
768 | |
694 | =back |
769 | =back |
695 | |
770 | |
696 | =head3 MESSAGE LOGGING |
771 | =head3 LOG TARGETS |
697 | |
772 | |
698 | The following methods configure how the logging context actually does |
773 | The following methods configure how the logging context actually does |
699 | the logging (which consists of formatting the message and printing it or |
774 | the logging (which consists of formatting the message and printing it or |
700 | whatever it wants to do with it) and also allows you to log messages |
775 | whatever it wants to do with it). |
701 | directly to a context, without going via your package context. |
|
|
702 | |
776 | |
703 | =over 4 |
777 | =over 4 |
704 | |
778 | |
705 | =item $ctx->log_cb ($cb->($str)) |
779 | =item $ctx->log_cb ($cb->($str) |
706 | |
780 | |
707 | Replaces the logging callback on the context (C<undef> disables the |
781 | Replaces the logging callback on the context (C<undef> disables the |
708 | logging callback). |
782 | logging callback). |
709 | |
783 | |
710 | The logging callback is responsible for handling formatted log messages |
784 | The logging callback is responsible for handling formatted log messages |
711 | (see C<fmt_cb> below) - normally simple text strings that end with a |
785 | (see C<fmt_cb> below) - normally simple text strings that end with a |
712 | newline (and are possibly multiline themselves). |
786 | newline (and are possibly multiline themselves). |
713 | |
787 | |
714 | It also has to return true iff it has consumed the log message, and false |
788 | It also has to return true iff it has consumed the log message, and false |
715 | if it hasn't. Consuming a message means that it will not be sent to any |
789 | if it hasn't. Consuming a message means that it will not be sent to any |
716 | parent context. When in doubt, return C<0> from your logging callback. |
790 | slave context. When in doubt, return C<0> from your logging callback. |
717 | |
791 | |
718 | Example: a very simple logging callback, simply dump the message to STDOUT |
792 | Example: a very simple logging callback, simply dump the message to STDOUT |
719 | and do not consume it. |
793 | and do not consume it. |
720 | |
794 | |
721 | $ctx->log_cb (sub { print STDERR shift; 0 }); |
795 | $ctx->log_cb (sub { print STDERR shift; 0 }); |
… | |
… | |
729 | your program. |
803 | your program. |
730 | |
804 | |
731 | $ctx->levels ("debug", "trace"); |
805 | $ctx->levels ("debug", "trace"); |
732 | $ctx->log_cb (sub { 1 }); # do not log, but eat debug and trace messages |
806 | $ctx->log_cb (sub { 1 }); # do not log, but eat debug and trace messages |
733 | |
807 | |
734 | =item $ctx->fmt_cb ($fmt_cb->($timestamp, $ctx, $level, $message)) |
808 | =item $ctx->fmt_cb ($fmt_cb->($timestamp, $orig_ctx, $level, $message)) |
735 | |
809 | |
736 | Replaces the formatting callback on the context (C<undef> restores the |
810 | Replaces the formatting callback on the context (C<undef> restores the |
737 | default formatter). |
811 | default formatter). |
738 | |
812 | |
739 | The callback is passed the (possibly fractional) timestamp, the original |
813 | The callback is passed the (possibly fractional) timestamp, the original |
740 | logging context, the (numeric) logging level and the raw message string and needs to |
814 | logging context, the (numeric) logging level and the raw message string |
741 | return a formatted log message. In most cases this will be a string, but |
815 | and needs to return a formatted log message. In most cases this will be a |
742 | it could just as well be an array reference that just stores the values. |
816 | string, but it could just as well be an array reference that just stores |
|
|
817 | the values. |
|
|
818 | |
|
|
819 | If, for some reason, you want to use C<caller> to find out more baout the |
|
|
820 | logger then you should walk up the call stack until you are no longer |
|
|
821 | inside the C<AnyEvent::Log> package. |
743 | |
822 | |
744 | Example: format just the raw message, with numeric log level in angle |
823 | Example: format just the raw message, with numeric log level in angle |
745 | brackets. |
824 | brackets. |
746 | |
825 | |
747 | $ctx->fmt_cb (sub { |
826 | $ctx->fmt_cb (sub { |
… | |
… | |
764 | "$msg->[3]"; |
843 | "$msg->[3]"; |
765 | |
844 | |
766 | 0 |
845 | 0 |
767 | }); |
846 | }); |
768 | |
847 | |
|
|
848 | =item $ctx->log_to_warn |
|
|
849 | |
|
|
850 | Sets the C<log_cb> to simply use C<CORE::warn> to report any messages |
|
|
851 | (usually this logs to STDERR). |
|
|
852 | |
|
|
853 | =item $ctx->log_to_file ($path) |
|
|
854 | |
|
|
855 | Sets the C<log_cb> to log to a file (by appending), unbuffered. |
|
|
856 | |
|
|
857 | =item $ctx->log_to_path ($path) |
|
|
858 | |
|
|
859 | Same as C<< ->log_to_file >>, but opens the file for each message. This |
|
|
860 | is much slower, but allows you to change/move/rename/delete the file at |
|
|
861 | basically any time. |
|
|
862 | |
|
|
863 | Needless(?) to say, if you do not want to be bitten by some evil person |
|
|
864 | calling C<chdir>, the path should be absolute. Doesn't help with |
|
|
865 | C<chroot>, but hey... |
|
|
866 | |
|
|
867 | =item $ctx->log_to_syslog ([$log_flags]) |
|
|
868 | |
|
|
869 | Logs all messages via L<Sys::Syslog>, mapping C<trace> to C<debug> and all |
|
|
870 | the others in the obvious way. If specified, then the C<$log_flags> are |
|
|
871 | simply or'ed onto the priority argument and can contain any C<LOG_xxx> |
|
|
872 | flags valid for Sys::Syslog::syslog, except for the priority levels. |
|
|
873 | |
|
|
874 | Note that this function also sets a C<fmt_cb> - the logging part requires |
|
|
875 | an array reference with [$level, $str] as input. |
|
|
876 | |
769 | =cut |
877 | =cut |
770 | |
878 | |
771 | sub log_cb { |
879 | sub log_cb { |
772 | my ($ctx, $cb) = @_; |
880 | my ($ctx, $cb) = @_; |
773 | |
881 | |
… | |
… | |
778 | my ($ctx, $cb) = @_; |
886 | my ($ctx, $cb) = @_; |
779 | |
887 | |
780 | $ctx->[4] = $cb; |
888 | $ctx->[4] = $cb; |
781 | } |
889 | } |
782 | |
890 | |
783 | =item $ctx->log ($level, $msg[, @params]) |
891 | sub log_to_warn { |
|
|
892 | my ($ctx, $path) = @_; |
784 | |
893 | |
785 | Same as C<AnyEvent::Log::log>, but uses the given context as log context. |
894 | $ctx->log_cb (sub { |
|
|
895 | warn shift; |
|
|
896 | 0 |
|
|
897 | }); |
|
|
898 | } |
786 | |
899 | |
787 | =item $logger = $ctx->logger ($level[, \$enabled]) |
900 | sub log_to_file { |
788 | |
901 | my ($ctx, $path) = @_; |
789 | Same as C<AnyEvent::Log::logger>, but uses the given context as log |
|
|
790 | context. |
|
|
791 | |
|
|
792 | =cut |
|
|
793 | |
|
|
794 | *log = \&AnyEvent::Log::_log; |
|
|
795 | *logger = \&AnyEvent::Log::_logger; |
|
|
796 | |
|
|
797 | 1; |
|
|
798 | |
|
|
799 | =back |
|
|
800 | |
|
|
801 | =head1 EXAMPLES |
|
|
802 | |
|
|
803 | This section shows some common configurations. |
|
|
804 | |
|
|
805 | =over 4 |
|
|
806 | |
|
|
807 | =item Setting the global logging level. |
|
|
808 | |
|
|
809 | Either put PERL_ANYEVENT_VERBOSE=<number> into your environment before |
|
|
810 | running your program, or modify the log level of the root context: |
|
|
811 | |
|
|
812 | PERL_ANYEVENT_VERBOSE=5 ./myprog |
|
|
813 | |
|
|
814 | $AnyEvent::Log::Root->level ("warn"); |
|
|
815 | |
|
|
816 | =item Append all messages to a file instead of sending them to STDERR. |
|
|
817 | |
|
|
818 | This is affected by the global logging level. |
|
|
819 | |
902 | |
820 | open my $fh, ">>", $path |
903 | open my $fh, ">>", $path |
821 | or die "$path: $!"; |
904 | or die "$path: $!"; |
822 | |
905 | |
823 | $AnyEvent::Log::Default->log_cb (sub { |
906 | $ctx->log_cb (sub { |
824 | syswrite $fh, shift; |
907 | syswrite $fh, shift; |
825 | 0 |
908 | 0 |
826 | }); |
909 | }); |
|
|
910 | } |
|
|
911 | |
|
|
912 | sub log_to_path { |
|
|
913 | my ($ctx, $path) = @_; |
|
|
914 | |
|
|
915 | $ctx->log_cb (sub { |
|
|
916 | open my $fh, ">>", $path |
|
|
917 | or die "$path: $!"; |
|
|
918 | |
|
|
919 | syswrite $fh, shift; |
|
|
920 | 0 |
|
|
921 | }); |
|
|
922 | } |
|
|
923 | |
|
|
924 | sub log_to_syslog { |
|
|
925 | my ($ctx, $flags) = @_; |
|
|
926 | |
|
|
927 | require Sys::Syslog; |
|
|
928 | |
|
|
929 | $ctx->fmt_cb (sub { |
|
|
930 | my $str = $_[3]; |
|
|
931 | $str =~ s/\n(?=.)/\n+ /g; |
|
|
932 | |
|
|
933 | [$_[2], "($_[1][0]) $str"] |
|
|
934 | }); |
|
|
935 | |
|
|
936 | $ctx->log_cb (sub { |
|
|
937 | my $lvl = $_[0][0] < 9 ? $_[0][0] : 8; |
|
|
938 | |
|
|
939 | Sys::Syslog::syslog ($flags | ($lvl - 1), $_) |
|
|
940 | for split /\n/, $_[0][1]; |
|
|
941 | |
|
|
942 | 0 |
|
|
943 | }); |
|
|
944 | } |
|
|
945 | |
|
|
946 | =back |
|
|
947 | |
|
|
948 | =head3 MESSAGE LOGGING |
|
|
949 | |
|
|
950 | These methods allow you to log messages directly to a context, without |
|
|
951 | going via your package context. |
|
|
952 | |
|
|
953 | =over 4 |
|
|
954 | |
|
|
955 | =item $ctx->log ($level, $msg[, @params]) |
|
|
956 | |
|
|
957 | Same as C<AnyEvent::Log::log>, but uses the given context as log context. |
|
|
958 | |
|
|
959 | =item $logger = $ctx->logger ($level[, \$enabled]) |
|
|
960 | |
|
|
961 | Same as C<AnyEvent::Log::logger>, but uses the given context as log |
|
|
962 | context. |
|
|
963 | |
|
|
964 | =cut |
|
|
965 | |
|
|
966 | *log = \&AnyEvent::Log::_log; |
|
|
967 | *logger = \&AnyEvent::Log::_logger; |
|
|
968 | |
|
|
969 | =back |
|
|
970 | |
|
|
971 | =cut |
|
|
972 | |
|
|
973 | package AnyEvent::Log; |
|
|
974 | |
|
|
975 | =head1 CONFIGURATION VIA $ENV{PERL_ANYEVENT_LOG} |
|
|
976 | |
|
|
977 | Logging can also be configured by setting the environment variable |
|
|
978 | C<PERL_ANYEVENT_LOG> (or C<AE_LOG>). |
|
|
979 | |
|
|
980 | The value consists of one or more logging context specifications separated |
|
|
981 | by C<:> or whitespace. Each logging specification in turn starts with a |
|
|
982 | context name, followed by C<=>, followed by zero or more comma-separated |
|
|
983 | configuration directives, here are some examples: |
|
|
984 | |
|
|
985 | # set default logging level |
|
|
986 | filter=warn |
|
|
987 | |
|
|
988 | # log to file instead of to stderr |
|
|
989 | log=file=/tmp/mylog |
|
|
990 | |
|
|
991 | # log to file in addition to stderr |
|
|
992 | log=+%file:%file=file=/tmp/mylog |
|
|
993 | |
|
|
994 | # enable debug log messages, log warnings and above to syslog |
|
|
995 | filter=debug:log=+%warnings:%warnings=warn,syslog=LOG_LOCAL0 |
|
|
996 | |
|
|
997 | # log trace messages (only) from AnyEvent::Debug to file |
|
|
998 | AnyEvent::Debug=+%trace:%trace=only,trace,file=/tmp/tracelog |
|
|
999 | |
|
|
1000 | A context name in the log specification can be any of the following: |
|
|
1001 | |
|
|
1002 | =over 4 |
|
|
1003 | |
|
|
1004 | =item C<collect>, C<filter>, C<log> |
|
|
1005 | |
|
|
1006 | Correspond to the three predefined C<$AnyEvent::Log::COLLECT>, |
|
|
1007 | C<AnyEvent::Log::FILTER> and C<$AnyEvent::Log::LOG> contexts. |
|
|
1008 | |
|
|
1009 | =item C<%name> |
|
|
1010 | |
|
|
1011 | Context names starting with a C<%> are anonymous contexts created when the |
|
|
1012 | name is first mentioned. The difference to package contexts is that by |
|
|
1013 | default they have no attached slaves. |
|
|
1014 | |
|
|
1015 | =item a perl package name |
|
|
1016 | |
|
|
1017 | Any other string references the logging context associated with the given |
|
|
1018 | Perl C<package>. In the unlikely case where you want to specify a package |
|
|
1019 | context that matches on of the other context name forms, you can add a |
|
|
1020 | C<::> to the package name to force interpretation as a package. |
|
|
1021 | |
|
|
1022 | =back |
|
|
1023 | |
|
|
1024 | The configuration specifications can be any number of the following: |
|
|
1025 | |
|
|
1026 | =over 4 |
|
|
1027 | |
|
|
1028 | =item C<stderr> |
|
|
1029 | |
|
|
1030 | Configures the context to use Perl's C<warn> function (which typically |
|
|
1031 | logs to C<STDERR>). Works like C<log_to_warn>. |
|
|
1032 | |
|
|
1033 | =item C<file=>I<path> |
|
|
1034 | |
|
|
1035 | Configures the context to log to a file with the given path. Works like |
|
|
1036 | C<log_to_file>. |
|
|
1037 | |
|
|
1038 | =item C<path=>I<path> |
|
|
1039 | |
|
|
1040 | Configures the context to log to a file with the given path. Works like |
|
|
1041 | C<log_to_path>. |
|
|
1042 | |
|
|
1043 | =item C<syslog> or C<syslog=>I<expr> |
|
|
1044 | |
|
|
1045 | Configures the context to log to syslog. If I<expr> is given, then it is |
|
|
1046 | evaluated in the L<Sys::Syslog> package, so you could use: |
|
|
1047 | |
|
|
1048 | log=syslog=LOG_LOCAL0 |
|
|
1049 | |
|
|
1050 | =item C<nolog> |
|
|
1051 | |
|
|
1052 | Configures the context to not log anything by itself, which is the |
|
|
1053 | default. Same as C<< $ctx->log_cb (undef) >>. |
|
|
1054 | |
|
|
1055 | =item C<0> or C<off> |
|
|
1056 | |
|
|
1057 | Sets the logging level of the context ot C<0>, i.e. all messages will be |
|
|
1058 | filtered out. |
|
|
1059 | |
|
|
1060 | =item C<all> |
|
|
1061 | |
|
|
1062 | Enables all logging levels, i.e. filtering will effectively be switched |
|
|
1063 | off (the default). |
|
|
1064 | |
|
|
1065 | =item C<only> |
|
|
1066 | |
|
|
1067 | Disables all logging levels, and changes the interpretation of following |
|
|
1068 | level specifications to enable the specified level only. |
|
|
1069 | |
|
|
1070 | Example: only enable debug messages for a context. |
|
|
1071 | |
|
|
1072 | context=only,debug |
|
|
1073 | |
|
|
1074 | =item C<except> |
|
|
1075 | |
|
|
1076 | Enables all logging levels, and changes the interpretation of following |
|
|
1077 | level specifications to disable that level. Rarely used. |
|
|
1078 | |
|
|
1079 | Example: enable all logging levels except fatal and trace (this is rather |
|
|
1080 | nonsensical). |
|
|
1081 | |
|
|
1082 | filter=exept,fatal,trace |
|
|
1083 | |
|
|
1084 | =item C<level> |
|
|
1085 | |
|
|
1086 | Enables all logging levels, and changes the interpretation of following |
|
|
1087 | level specifications to be "that level or any higher priority |
|
|
1088 | message". This is the default. |
|
|
1089 | |
|
|
1090 | Example: log anything at or above warn level. |
|
|
1091 | |
|
|
1092 | filter=warn |
|
|
1093 | |
|
|
1094 | # or, more verbose |
|
|
1095 | filter=only,level,warn |
|
|
1096 | |
|
|
1097 | =item C<1>..C<9> or a logging level name (C<error>, C<debug> etc.) |
|
|
1098 | |
|
|
1099 | A numeric loglevel or the name of a loglevel will be interpreted according |
|
|
1100 | to the most recent C<only>, C<except> or C<level> directive. By default, |
|
|
1101 | specifying a logging level enables that and any higher priority messages. |
|
|
1102 | |
|
|
1103 | =item C<+>I<context> |
|
|
1104 | |
|
|
1105 | Attaches the named context as slave to the context. |
|
|
1106 | |
|
|
1107 | =item C<+> |
|
|
1108 | |
|
|
1109 | A line C<+> detaches all contexts, i.e. clears the slave list from the |
|
|
1110 | context. Anonymous (C<%name>) contexts have no attached slaves by default, |
|
|
1111 | but package contexts have the parent context as slave by default. |
|
|
1112 | |
|
|
1113 | Example: log messages from My::Module to a file, do not send them to the |
|
|
1114 | default log collector. |
|
|
1115 | |
|
|
1116 | My::Module=+,file=/tmp/mymodulelog |
|
|
1117 | |
|
|
1118 | =back |
|
|
1119 | |
|
|
1120 | Any character can be escaped by prefixing it with a C<\> (backslash), as |
|
|
1121 | usual, so to log to a file containing a comma, colon, backslash and some |
|
|
1122 | spaces in the filename, you would do this: |
|
|
1123 | |
|
|
1124 | PERL_ANYEVENT_LOG='log=file=/some\ \:file\ with\,\ \\-escapes' |
|
|
1125 | |
|
|
1126 | Since whitespace (which includes newlines) is allowed, it is fine to |
|
|
1127 | specify multiple lines in C<PERL_ANYEVENT_LOG>, e.g.: |
|
|
1128 | |
|
|
1129 | PERL_ANYEVENT_LOG=" |
|
|
1130 | filter=warn |
|
|
1131 | AnyEvent::Debug=+%trace |
|
|
1132 | %trace=only,trace,+log |
|
|
1133 | " myprog |
|
|
1134 | |
|
|
1135 | Also, in the unlikely case when you want to concatenate specifications, |
|
|
1136 | use whitespace as separator, as C<::> will be interpreted as part of a |
|
|
1137 | module name, an empty spec with two separators: |
|
|
1138 | |
|
|
1139 | PERL_ANYEVENT_LOG="$PERL_ANYEVENT_LOG MyMod=debug" |
|
|
1140 | |
|
|
1141 | =cut |
|
|
1142 | |
|
|
1143 | for (my $spec = $ENV{PERL_ANYEVENT_LOG}) { |
|
|
1144 | my %anon; |
|
|
1145 | |
|
|
1146 | my $pkg = sub { |
|
|
1147 | $_[0] eq "log" ? $LOG |
|
|
1148 | : $_[0] eq "filter" ? $FILTER |
|
|
1149 | : $_[0] eq "collect" ? $COLLECT |
|
|
1150 | : $_[0] =~ /^%(.+)$/ ? ($anon{$1} ||= ctx undef) |
|
|
1151 | : $_[0] =~ /^(.*?)(?:::)?$/ ? ctx "$1" # egad :/ |
|
|
1152 | : die # never reached? |
|
|
1153 | }; |
|
|
1154 | |
|
|
1155 | /\G[[:space:]]+/gc; # skip initial whitespace |
|
|
1156 | |
|
|
1157 | while (/\G((?:[^:=[:space:]]+|::|\\.)+)=/gc) { |
|
|
1158 | my $ctx = $pkg->($1); |
|
|
1159 | my $level = "level"; |
|
|
1160 | |
|
|
1161 | while (/\G((?:[^,:[:space:]]+|::|\\.)+)/gc) { |
|
|
1162 | for ("$1") { |
|
|
1163 | if ($_ eq "stderr" ) { $ctx->log_to_warn; |
|
|
1164 | } elsif (/^file=(.+)/ ) { $ctx->log_to_file ("$1"); |
|
|
1165 | } elsif (/^path=(.+)/ ) { $ctx->log_to_path ("$1"); |
|
|
1166 | } elsif (/syslog(?:=(.*))?/ ) { require Sys::Syslog; $ctx->log_to_syslog (eval "package Sys::Syslog; $1"); |
|
|
1167 | } elsif ($_ eq "nolog" ) { $ctx->log_cb (undef); |
|
|
1168 | } elsif (/^\+(.+)$/ ) { $ctx->attach ($pkg->("$1")); |
|
|
1169 | } elsif ($_ eq "+" ) { $ctx->slaves; |
|
|
1170 | } elsif ($_ eq "off" or $_ eq "0") { $ctx->level (0); |
|
|
1171 | } elsif ($_ eq "all" ) { $ctx->level ("all"); |
|
|
1172 | } elsif ($_ eq "level" ) { $ctx->level ("all"); $level = "level"; |
|
|
1173 | } elsif ($_ eq "only" ) { $ctx->level ("off"); $level = "enable"; |
|
|
1174 | } elsif ($_ eq "except" ) { $ctx->level ("all"); $level = "disable"; |
|
|
1175 | } elsif (/^\d$/ ) { $ctx->$level ($_); |
|
|
1176 | } elsif (exists $STR2LEVEL{$_} ) { $ctx->$level ($_); |
|
|
1177 | } else { die "PERL_ANYEVENT_LOG ($spec): parse error at '$_'\n"; |
|
|
1178 | } |
|
|
1179 | } |
|
|
1180 | |
|
|
1181 | /\G,/gc or last; |
|
|
1182 | } |
|
|
1183 | |
|
|
1184 | /\G[:[:space:]]+/gc or last; |
|
|
1185 | } |
|
|
1186 | |
|
|
1187 | /\G[[:space:]]+/gc; # skip trailing whitespace |
|
|
1188 | |
|
|
1189 | if (/\G(.+)/g) { |
|
|
1190 | die "PERL_ANYEVENT_LOG ($spec): parse error at '$1'\n"; |
|
|
1191 | } |
|
|
1192 | } |
|
|
1193 | |
|
|
1194 | 1; |
|
|
1195 | |
|
|
1196 | =head1 EXAMPLES |
|
|
1197 | |
|
|
1198 | This section shows some common configurations, both as code, and as |
|
|
1199 | C<PERL_ANYEVENT_LOG> string. |
|
|
1200 | |
|
|
1201 | =over 4 |
|
|
1202 | |
|
|
1203 | =item Setting the global logging level. |
|
|
1204 | |
|
|
1205 | Either put C<PERL_ANYEVENT_VERBOSE=><number> into your environment before |
|
|
1206 | running your program, use C<PERL_ANYEVENT_LOG> or modify the log level of |
|
|
1207 | the root context at runtime: |
|
|
1208 | |
|
|
1209 | PERL_ANYEVENT_VERBOSE=5 ./myprog |
|
|
1210 | |
|
|
1211 | PERL_ANYEVENT_LOG=log=warn |
|
|
1212 | |
|
|
1213 | $AnyEvent::Log::FILTER->level ("warn"); |
|
|
1214 | |
|
|
1215 | =item Append all messages to a file instead of sending them to STDERR. |
|
|
1216 | |
|
|
1217 | This is affected by the global logging level. |
|
|
1218 | |
|
|
1219 | $AnyEvent::Log::LOG->log_to_file ($path); |
|
|
1220 | |
|
|
1221 | PERL_ANYEVENT_LOG=log=file=/some/path |
827 | |
1222 | |
828 | =item Write all messages with priority C<error> and higher to a file. |
1223 | =item Write all messages with priority C<error> and higher to a file. |
829 | |
1224 | |
830 | This writes them only when the global logging level allows it, because |
1225 | This writes them only when the global logging level allows it, because |
831 | it is attached to the default context which is invoked I<after> global |
1226 | it is attached to the default context which is invoked I<after> global |
832 | filtering. |
1227 | filtering. |
833 | |
1228 | |
834 | open my $fh, ">>", $path |
1229 | $AnyEvent::Log::FILTER->attach |
835 | or die "$path: $!"; |
1230 | new AnyEvent::Log::Ctx log_to_file => $path); |
836 | |
1231 | |
837 | $AnyEvent::Log::Default->attach (new AnyEvent::Log::Ctx |
1232 | PERL_ANYEVENT_LOG=filter=+%filelogger:%filelogger=file=/some/path |
838 | log_cb => sub { syswrite $fh, shift; 0 }); |
|
|
839 | |
1233 | |
840 | This writes them regardless of the global logging level, because it is |
1234 | This writes them regardless of the global logging level, because it is |
841 | attached to the toplevel context, which receives all messages I<before> |
1235 | attached to the toplevel context, which receives all messages I<before> |
842 | the global filtering. |
1236 | the global filtering. |
843 | |
1237 | |
844 | $AnyEvent::Log::Top->attach (new AnyEvent::Log::Ctx |
1238 | $AnyEvent::Log::COLLECT->attach ( |
845 | log_cb => sub { syswrite $fh, shift; 0 }); |
1239 | new AnyEvent::Log::Ctx log_to_file => $path); |
846 | |
1240 | |
|
|
1241 | PERL_ANYEVENT_LOG=%filelogger=file=/some/path:collect=+%filelogger |
|
|
1242 | |
847 | In both cases, messages are still written to STDOUT. |
1243 | In both cases, messages are still written to STDERR. |
848 | |
1244 | |
849 | =item Write trace messages (only) from L<AnyEvent::Debug> to the default logging target(s). |
1245 | =item Write trace messages (only) from L<AnyEvent::Debug> to the default logging target(s). |
850 | |
1246 | |
851 | Attach the CyAnyEvent::Log::Default> context to the C<AnyEvent::Debug> |
1247 | Attach the C<$AnyEvent::Log::LOG> context to the C<AnyEvent::Debug> |
852 | context and increase the C<AnyEvent::Debug> logging level - this simply |
|
|
853 | circumvents the global filtering for trace messages. |
1248 | context - this simply circumvents the global filtering for trace messages. |
854 | |
1249 | |
855 | my $debug = AnyEvent::Debug->AnyEvent::Log::ctx; |
1250 | my $debug = AnyEvent::Debug->AnyEvent::Log::ctx; |
856 | $debug->attach ($AnyEvent::Log::Default); |
1251 | $debug->attach ($AnyEvent::Log::LOG); |
857 | $debug->levels ("trace"); # not "level"! |
|
|
858 | |
1252 | |
859 | This of course works for any package. |
1253 | PERL_ANYEVENT_LOG=AnyEvent::Debug=+log |
|
|
1254 | |
|
|
1255 | This of course works for any package, not just L<AnyEvent::Debug>, but |
|
|
1256 | assumes the log level for AnyEvent::Debug hasn't been changed from the |
|
|
1257 | default. |
860 | |
1258 | |
861 | =back |
1259 | =back |
862 | |
1260 | |
863 | =head1 AUTHOR |
1261 | =head1 AUTHOR |
864 | |
1262 | |
865 | Marc Lehmann <schmorp@schmorp.de> |
1263 | Marc Lehmann <schmorp@schmorp.de> |
866 | http://home.schmorp.de/ |
1264 | http://home.schmorp.de/ |
867 | |
1265 | |
868 | =cut |
1266 | =cut |
|
|
1267 | |