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2 | |
2 | |
3 | AnyEvent::Log - simple logging "framework" |
3 | AnyEvent::Log - simple logging "framework" |
4 | |
4 | |
5 | =head1 SYNOPSIS |
5 | =head1 SYNOPSIS |
6 | |
6 | |
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7 | # simple use |
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8 | use AnyEvent; |
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9 | |
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10 | AE::log debug => "hit my knee"; |
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11 | AE::log warn => "it's a bit too hot"; |
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12 | AE::log error => "the flag was false!"; |
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13 | AE::log fatal => "the bit toggled! run!"; |
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14 | |
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15 | # "complex" use |
7 | use AnyEvent::Log; |
16 | use AnyEvent::Log; |
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17 | |
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18 | my $tracer = AnyEvent::Log::logger trace => \$my $trace; |
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19 | |
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20 | $tracer->("i am here") if $trace; |
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21 | $tracer->(sub { "lots of data: " . Dumper $self }) if $trace; |
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22 | |
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23 | # configuration |
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24 | |
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25 | # set logging for this package to maximum |
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26 | AnyEvent::Log::ctx->level ("all"); |
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27 | |
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28 | # set logging globally to anything below debug |
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29 | (AnyEvent::Log::ctx "")->level ("notice"); |
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30 | |
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31 | # see also EXAMPLES, below |
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32 | |
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33 | # disable logging for package "AnyEvent" and all packages below it |
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34 | AnyEvent->AnyEvent::Log::ctx->level (0); |
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35 | |
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36 | # log everything below debug to a file, for the whole program |
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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); |
8 | |
40 | |
9 | =head1 DESCRIPTION |
41 | =head1 DESCRIPTION |
10 | |
42 | |
11 | This module implements a relatively simple "logging framework". It doesn't |
43 | This module implements a relatively simple "logging framework". It doesn't |
12 | attempt to be "the" logging solution or even "a" logging solution for |
44 | attempt to be "the" logging solution or even "a" logging solution for |
13 | AnyEvent - AnyEvent simply creates logging messages internally, and this |
45 | AnyEvent - AnyEvent simply creates logging messages internally, and this |
14 | module more or less exposes the mechanism, with some extra spiff to allow |
46 | module more or less exposes the mechanism, with some extra spiff to allow |
15 | using it from other modules as well. |
47 | using it from other modules as well. |
16 | |
48 | |
17 | Remember that the default verbosity level is C<0>, so nothing |
49 | Remember that the default verbosity level is C<0>, so nothing will be |
18 | will be logged, ever, unless you set C<$Anyvent::VERBOSE> or |
50 | logged, ever, unless you set C<PERL_ANYEVENT_VERBOSE> to a higher number |
19 | C<PERL_ANYEVENT_VERBOSE> to a higher number. |
51 | before starting your program, or change the logging level at runtime wiht |
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52 | something like: |
20 | |
53 | |
21 | Possible future extensions are to allow custom log targets (where the |
54 | use AnyEvent; |
22 | level is an object), log filtering based on package, formatting, aliasing |
55 | (AnyEvent::Log::ctx "")->level ("info"); |
23 | or package groups. |
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24 | |
56 | |
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57 | The design goal behind this module was to keep it simple (and small), |
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58 | but make it powerful enough to be potentially useful for any module, and |
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59 | extensive enough for the most common tasks, such as logging to multiple |
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60 | targets, or being able to log into a database. |
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61 | |
25 | =head1 LOG FUNCTIONS |
62 | =head1 LOGGING FUNCTIONS |
26 | |
63 | |
27 | These functions allow you to log messages. They always use the caller's |
64 | These functions allow you to log messages. They always use the caller's |
28 | package as a "logging module/source". Also, The main logging function is |
65 | package as a "logging module/source". Also, the main logging function is |
29 | easily available as C<AnyEvent::log> or C<AE::log> when the C<AnyEvent> |
66 | callable as C<AnyEvent::log> or C<AE::log> when the C<AnyEvent> module is |
30 | module is loaded. |
67 | loaded. |
31 | |
68 | |
32 | =over 4 |
69 | =over 4 |
33 | |
70 | |
34 | =cut |
71 | =cut |
35 | |
72 | |
… | |
… | |
37 | |
74 | |
38 | use Carp (); |
75 | use Carp (); |
39 | use POSIX (); |
76 | use POSIX (); |
40 | |
77 | |
41 | use AnyEvent (); BEGIN { AnyEvent::common_sense } |
78 | use AnyEvent (); BEGIN { AnyEvent::common_sense } |
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79 | use AnyEvent::Util (); |
42 | |
80 | |
43 | our ($now_int, $now_str1, $now_str2); |
81 | our ($now_int, $now_str1, $now_str2); |
44 | |
82 | |
45 | # Format Time, not public - yet? |
83 | # Format Time, not public - yet? |
46 | sub ft($) { |
84 | sub ft($) { |
… | |
… | |
51 | if $now_int != $i; |
89 | if $now_int != $i; |
52 | |
90 | |
53 | "$now_str1$f$now_str2" |
91 | "$now_str1$f$now_str2" |
54 | } |
92 | } |
55 | |
93 | |
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94 | our %CTX; # all logging contexts |
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95 | |
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96 | # creates a default package context object for the given package |
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97 | sub _pkg_ctx($) { |
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98 | my $ctx = bless [$_[0], (1 << 10) - 1 - 1, {}], "AnyEvent::Log::Ctx"; |
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99 | |
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100 | # link "parent" package |
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101 | my $pkg = $_[0] =~ /^(.+)::/ ? $1 : ""; |
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102 | |
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103 | $pkg = $CTX{$pkg} ||= &_pkg_ctx ($pkg); |
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104 | $ctx->[2]{$pkg+0} = $pkg; |
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105 | |
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106 | $ctx |
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107 | } |
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108 | |
56 | =item AnyEvent::Log::log $level, $msg[, @args] |
109 | =item AnyEvent::Log::log $level, $msg[, @args] |
57 | |
110 | |
58 | Requests logging of the given C<$msg> with the given log level (1..9). |
111 | Requests logging of the given C<$msg> with the given log level (1..9). |
59 | You can also use the following strings as log level: C<fatal> (1), |
112 | You can also use the following strings as log level: C<fatal> (1), |
60 | C<alert> (2), C<critical> (3), C<error> (4), C<warn> (5), C<note> (6), |
113 | C<alert> (2), C<critical> (3), C<error> (4), C<warn> (5), C<note> (6), |
… | |
… | |
66 | C<$msg> is interpreted as an sprintf format string. |
119 | C<$msg> is interpreted as an sprintf format string. |
67 | |
120 | |
68 | The C<$msg> should not end with C<\n>, but may if that is convenient for |
121 | The C<$msg> should not end with C<\n>, but may if that is convenient for |
69 | you. Also, multiline messages are handled properly. |
122 | you. Also, multiline messages are handled properly. |
70 | |
123 | |
71 | In addition, for possible future expansion, C<$msg> must not start with an |
124 | Last not least, C<$msg> might be a code reference, in which case it is |
72 | angle bracket (C<< < >>). |
125 | supposed to return the message. It will be called only then the message |
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126 | actually gets logged, which is useful if it is costly to create the |
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127 | message in the first place. |
73 | |
128 | |
74 | Whether the given message will be logged depends on the maximum log level |
129 | Whether the given message will be logged depends on the maximum log level |
75 | and the caller's package. |
130 | and the caller's package. |
76 | |
131 | |
77 | Note that you can (and should) call this function as C<AnyEvent::log> or |
132 | Note that you can (and should) call this function as C<AnyEvent::log> or |
78 | C<AE::log>, without C<use>-ing this module if possible, as those functions |
133 | C<AE::log>, without C<use>-ing this module if possible (i.e. you don't |
79 | will laod the logging module on demand only. |
134 | need any additional functionality), as those functions will load the |
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135 | logging module on demand only. They are also much shorter to write. |
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136 | |
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137 | Also, if you otpionally generate a lot of debug messages (such as when |
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138 | tracing some code), you should look into using a logger callback and a |
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139 | boolean enabler (see C<logger>, below). |
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140 | |
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141 | Example: log something at error level. |
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142 | |
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143 | AE::log error => "something"; |
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144 | |
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145 | Example: use printf-formatting. |
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146 | |
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147 | AE::log info => "%5d %-10.10s %s", $index, $category, $msg; |
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148 | |
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149 | Example: only generate a costly dump when the message is actually being logged. |
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150 | |
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151 | AE::log debug => sub { require Data::Dump; Data::Dump::dump \%cache }; |
80 | |
152 | |
81 | =cut |
153 | =cut |
82 | |
154 | |
83 | # also allow syslog equivalent names |
155 | # also allow syslog equivalent names |
84 | our %STR2LEVEL = ( |
156 | our %STR2LEVEL = ( |
… | |
… | |
91 | info => 7, |
163 | info => 7, |
92 | debug => 8, |
164 | debug => 8, |
93 | trace => 9, |
165 | trace => 9, |
94 | ); |
166 | ); |
95 | |
167 | |
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168 | sub now () { time } |
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169 | |
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170 | AnyEvent::post_detect { |
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171 | *now = \&AE::now; |
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172 | }; |
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173 | |
96 | our @LEVEL2STR = qw(0 fatal alert crit error warn note info debug trace); |
174 | our @LEVEL2STR = qw(0 fatal alert crit error warn note info debug trace); |
97 | |
175 | |
98 | sub log($$;@) { |
176 | # time, ctx, level, msg |
99 | my ($targ, $msg, @args) = @_; |
177 | sub _format($$$$) { |
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178 | my $pfx = ft $_[0]; |
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179 | my @res; |
100 | |
180 | |
101 | my $level = ref $targ ? die "Can't use reference as logging level (yet)" |
181 | for (split /\n/, sprintf "%-5s %s: %s", $LEVEL2STR[$_[2]], $_[1][0], $_[3]) { |
102 | : $targ > 0 && $targ <= 9 ? $targ+0 |
182 | push @res, "$pfx $_\n"; |
103 | : $STR2LEVEL{$targ} || Carp::croak "$targ: not a valid logging level, caught"; |
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104 | |
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105 | return if $level > $AnyEvent::VERBOSE; |
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106 | |
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107 | my $pkg = (caller)[0]; |
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108 | |
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109 | $msg = sprintf $msg, @args if @args; |
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110 | $msg =~ s/\n$//; |
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111 | |
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112 | # now we have a message, log it |
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113 | #TODO: could do LOTS of stuff here, and should, at least in some later version |
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114 | |
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115 | $msg = sprintf "%5s (%s) %s", $LEVEL2STR[$level], $pkg, $msg; |
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116 | my $pfx = ft AE::now; |
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117 | |
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118 | for (split /\n/, $msg) { |
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119 | printf STDERR "$pfx $_\n"; |
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120 | $pfx = "\t"; |
183 | $pfx = "\t"; |
121 | } |
184 | } |
122 | |
185 | |
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186 | join "", @res |
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187 | } |
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188 | |
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189 | sub _log { |
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190 | my ($ctx, $level, $format, @args) = @_; |
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191 | |
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192 | $level = $level > 0 && $level <= 9 ? $level+0 : $STR2LEVEL{$level} || Carp::croak "$level: not a valid logging level, caught"; |
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193 | |
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194 | my $mask = 1 << $level; |
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195 | |
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196 | my (@ctx, $now, $fmt); |
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197 | |
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198 | do { |
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199 | # skip if masked |
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200 | next unless $ctx->[1] & $mask; |
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201 | |
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202 | if ($ctx->[3]) { |
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203 | # logging target found |
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204 | |
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205 | # now get raw message, unless we have it already |
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206 | unless ($now) { |
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207 | $format = $format->() if ref $format; |
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208 | $format = sprintf $format, @args if @args; |
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209 | $format =~ s/\n$//; |
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210 | $now = AE::now; |
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211 | }; |
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212 | |
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213 | # format msg |
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214 | my $str = $ctx->[4] |
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215 | ? $ctx->[4]($now, $_[0], $level, $format) |
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216 | : $fmt ||= _format $now, $_[0], $level, $format; |
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217 | |
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218 | $ctx->[3]($str) |
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219 | and next; |
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220 | } |
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221 | |
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222 | # not masked, not consume - propagate to parent contexts |
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223 | push @ctx, values %{ $ctx->[2] }; |
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224 | } while $ctx = pop @ctx; |
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225 | |
123 | exit 1 if $level <= 1; |
226 | exit 1 if $level <= 1; |
124 | } |
227 | } |
125 | |
228 | |
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229 | sub log($$;@) { |
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230 | _log |
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231 | $CTX{ (caller)[0] } ||= _pkg_ctx +(caller)[0], |
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232 | @_; |
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233 | } |
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234 | |
126 | *AnyEvent::log = *AE::log = \&log; |
235 | *AnyEvent::log = *AE::log = \&log; |
127 | |
236 | |
128 | #TODO |
237 | =item $logger = AnyEvent::Log::logger $level[, \$enabled] |
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238 | |
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239 | Creates a code reference that, when called, acts as if the |
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240 | C<AnyEvent::Log::log> function was called at this point with the givne |
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241 | level. C<$logger> is passed a C<$msg> and optional C<@args>, just as with |
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242 | the C<AnyEvent::Log::log> function: |
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243 | |
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244 | my $debug_log = AnyEvent::Log::logger "debug"; |
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245 | |
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246 | $debug_log->("debug here"); |
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247 | $debug_log->("%06d emails processed", 12345); |
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248 | $debug_log->(sub { $obj->as_string }); |
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249 | |
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250 | The idea behind this function is to decide whether to log before actually |
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251 | logging - when the C<logger> function is called once, but the returned |
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252 | logger callback often, then this can be a tremendous speed win. |
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253 | |
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254 | Despite this speed advantage, changes in logging configuration will |
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255 | still be reflected by the logger callback, even if configuration changes |
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256 | I<after> it was created. |
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257 | |
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258 | To further speed up logging, you can bind a scalar variable to the logger, |
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259 | which contains true if the logger should be called or not - if it is |
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260 | false, calling the logger can be safely skipped. This variable will be |
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261 | updated as long as C<$logger> is alive. |
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262 | |
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263 | Full example: |
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264 | |
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265 | # near the init section |
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266 | use AnyEvent::Log; |
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267 | |
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268 | my $debug_log = AnyEvent:Log::logger debug => \my $debug; |
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269 | |
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270 | # and later in your program |
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271 | $debug_log->("yo, stuff here") if $debug; |
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272 | |
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273 | $debug and $debug_log->("123"); |
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274 | |
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275 | Note: currently the enabled var is always true - that will be fixed in a |
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276 | future version :) |
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277 | |
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278 | =cut |
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279 | |
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280 | our %LOGGER; |
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281 | |
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282 | # re-assess logging status for all loggers |
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283 | sub _reassess { |
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284 | for (@_ ? $LOGGER{$_[0]} : values %LOGGER) { |
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285 | my ($ctx, $level, $renabled) = @$_; |
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286 | |
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287 | # to detetc whether a message would be logged, we # actually |
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288 | # try to log one and die. this isn't # fast, but we can be |
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289 | # sure that the logging decision is correct :) |
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290 | |
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291 | $$renabled = !eval { |
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292 | local $SIG{__DIE__}; |
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293 | |
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294 | _log $ctx, $level, sub { die }; |
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295 | |
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296 | 1 |
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297 | }; |
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298 | |
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299 | $$renabled = 1; # TODO |
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300 | } |
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301 | } |
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302 | |
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303 | sub _logger($;$) { |
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304 | my ($ctx, $level, $renabled) = @_; |
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305 | |
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306 | $renabled ||= \my $enabled; |
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307 | |
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308 | $$renabled = 1; |
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309 | |
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310 | my $logger = [$ctx, $level, $renabled]; |
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311 | |
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312 | $LOGGER{$logger+0} = $logger; |
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313 | |
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314 | _reassess $logger+0; |
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315 | |
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316 | my $guard = AnyEvent::Util::guard { |
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317 | # "clean up" |
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318 | delete $LOGGER{$logger+0}; |
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319 | }; |
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320 | |
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321 | sub { |
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322 | $guard if 0; # keep guard alive, but don't cause runtime overhead |
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323 | |
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324 | _log $ctx, $level, @_ |
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325 | if $$renabled; |
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326 | } |
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327 | } |
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328 | |
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329 | sub logger($;$) { |
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330 | _logger |
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331 | $CTX{ (caller)[0] } ||= _pkg_ctx +(caller)[0], |
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332 | @_ |
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333 | } |
129 | |
334 | |
130 | =back |
335 | =back |
131 | |
336 | |
132 | =head1 CONFIGURATION FUNCTIONALITY |
337 | =head1 LOGGING CONTEXTS |
133 | |
338 | |
134 | None, yet, except for C<PERL_ANYEVENT_VERBOSE>, described in the L<AnyEvent> manpage. |
339 | This module associates every log message with a so-called I<logging |
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340 | context>, based on the package of the caller. Every perl package has its |
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341 | own logging context. |
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342 | |
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343 | A logging context has three major responsibilities: filtering, logging and |
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344 | propagating the message. |
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345 | |
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346 | For the first purpose, filtering, each context has a set of logging |
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347 | levels, called the log level mask. Messages not in the set will be ignored |
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348 | by this context (masked). |
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349 | |
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350 | For logging, the context stores a formatting callback (which takes the |
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351 | timestamp, context, level and string message and formats it in the way |
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352 | it should be logged) and a logging callback (which is responsible for |
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353 | actually logging the formatted message and telling C<AnyEvent::Log> |
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354 | whether it has consumed the message, or whether it should be propagated). |
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355 | |
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356 | For propagation, a context can have any number of attached I<parent |
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357 | contexts>. Any message that is neither masked by the logging mask nor |
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358 | masked by the logging callback returning true will be passed to all parent |
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359 | contexts. |
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360 | |
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361 | =head2 DEFAULTS |
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362 | |
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363 | By default, all logging contexts have an full set of log levels ("all"), a |
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364 | disabled logging callback and the default formatting callback. |
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365 | |
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366 | Package contexts have the package name as logging title by default. |
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367 | |
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368 | They have exactly one parent - the context of the "parent" package. The |
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369 | parent package is simply defined to be the package name without the last |
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370 | component, i.e. C<AnyEvent::Debug::Wrapped> becomes C<AnyEvent::Debug>, |
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371 | and C<AnyEvent> becomes the empty string. |
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372 | |
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373 | Since perl packages form only an approximate hierarchy, this parent |
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374 | context can of course be removed. |
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375 | |
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376 | All other (anonymous) contexts have no parents and an empty title by |
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377 | default. |
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378 | |
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379 | When the module is first loaded, it configures the root context (the one |
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380 | with the empty string) to simply dump all log messages to C<STDERR>, |
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381 | and sets it's log level set to all levels up to the one specified by |
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382 | C<$ENV{PERL_ANYEVENT_VERBOSE}>. |
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383 | |
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384 | The effect of all this is that log messages, by default, wander up to the |
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385 | root context and will be logged to STDERR if their log level is less than |
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386 | or equal to C<$ENV{PERL_ANYEVENT_VERBOSE}>. |
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387 | |
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388 | =head2 CREATING/FINDING A CONTEXT |
135 | |
389 | |
136 | =over 4 |
390 | =over 4 |
137 | |
391 | |
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392 | =item $ctx = AnyEvent::Log::ctx [$pkg] |
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393 | |
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394 | This function creates or returns a logging context (which is an object). |
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395 | |
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396 | If a package name is given, then the context for that packlage is |
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397 | returned. If it is called without any arguments, then the context for the |
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398 | callers package is returned (i.e. the same context as a C<AE::log> call |
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399 | would use). |
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400 | |
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401 | If C<undef> is given, then it creates a new anonymous context that is not |
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402 | tied to any package and is destroyed when no longer referenced. |
|
|
403 | |
138 | =cut |
404 | =cut |
|
|
405 | |
|
|
406 | sub ctx(;$) { |
|
|
407 | my $pkg = @_ ? shift : (caller)[0]; |
|
|
408 | |
|
|
409 | ref $pkg |
|
|
410 | ? $pkg |
|
|
411 | : defined $pkg |
|
|
412 | ? $CTX{$pkg} ||= AnyEvent::Log::_pkg_ctx $pkg |
|
|
413 | : bless [undef, (1 << 10) - 1 - 1], "AnyEvent::Log::Ctx" |
|
|
414 | } |
|
|
415 | |
|
|
416 | # create default root context |
|
|
417 | { |
|
|
418 | my $root = ctx undef; |
|
|
419 | $root->[0] = ""; |
|
|
420 | $root->title ("default"); |
|
|
421 | $root->level ($AnyEvent::VERBOSE); undef $AnyEvent::VERBOSE; |
|
|
422 | $root->log_cb (sub { |
|
|
423 | print STDERR shift; |
|
|
424 | 0 |
|
|
425 | }); |
|
|
426 | $CTX{""} = $root; |
|
|
427 | } |
|
|
428 | |
|
|
429 | =back |
|
|
430 | |
|
|
431 | =cut |
|
|
432 | |
|
|
433 | package AnyEvent::Log::Ctx; |
|
|
434 | |
|
|
435 | # 0 1 2 3 4 |
|
|
436 | # [$title, $level, %$parents, &$logcb, &$fmtcb] |
|
|
437 | |
|
|
438 | =head2 CONFIGURING A LOG CONTEXT |
|
|
439 | |
|
|
440 | The following methods can be used to configure the logging context. |
|
|
441 | |
|
|
442 | =over 4 |
|
|
443 | |
|
|
444 | =item $ctx->title ([$new_title]) |
|
|
445 | |
|
|
446 | Returns the title of the logging context - this is the package name, for |
|
|
447 | package contexts, and a user defined string for all others. |
|
|
448 | |
|
|
449 | If C<$new_title> is given, then it replaces the package name or title. |
|
|
450 | |
|
|
451 | =cut |
|
|
452 | |
|
|
453 | sub title { |
|
|
454 | $_[0][0] = $_[1] if @_ > 1; |
|
|
455 | $_[0][0] |
|
|
456 | } |
|
|
457 | |
|
|
458 | =back |
|
|
459 | |
|
|
460 | =head3 LOGGING LEVELS |
|
|
461 | |
|
|
462 | The following methods deal with the logging level set associated with the |
|
|
463 | log context. |
|
|
464 | |
|
|
465 | The most common method to use is probably C<< $ctx->level ($level) >>, |
|
|
466 | which configures the specified and any higher priority levels. |
|
|
467 | |
|
|
468 | All functions which accept a list of levels also accept the special string |
|
|
469 | C<all> which expands to all logging levels. |
|
|
470 | |
|
|
471 | =over 4 |
|
|
472 | |
|
|
473 | =item $ctx->levels ($level[, $level...) |
|
|
474 | |
|
|
475 | Enables logging for the given levels and disables it for all others. |
|
|
476 | |
|
|
477 | =item $ctx->level ($level) |
|
|
478 | |
|
|
479 | Enables logging for the given level and all lower level (higher priority) |
|
|
480 | ones. In addition to normal logging levels, specifying a level of C<0> or |
|
|
481 | C<off> disables all logging for this level. |
|
|
482 | |
|
|
483 | Example: log warnings, errors and higher priority messages. |
|
|
484 | |
|
|
485 | $ctx->level ("warn"); |
|
|
486 | $ctx->level (5); # same thing, just numeric |
|
|
487 | |
|
|
488 | =item $ctx->enable ($level[, $level...]) |
|
|
489 | |
|
|
490 | Enables logging for the given levels, leaving all others unchanged. |
|
|
491 | |
|
|
492 | =item $ctx->disable ($level[, $level...]) |
|
|
493 | |
|
|
494 | Disables logging for the given levels, leaving all others unchanged. |
|
|
495 | |
|
|
496 | =cut |
|
|
497 | |
|
|
498 | sub _lvl_lst { |
|
|
499 | map { |
|
|
500 | $_ > 0 && $_ <= 9 ? $_+0 |
|
|
501 | : $_ eq "all" ? (1 .. 9) |
|
|
502 | : $STR2LEVEL{$_} || Carp::croak "$_: not a valid logging level, caught" |
|
|
503 | } @_ |
|
|
504 | } |
|
|
505 | |
|
|
506 | our $NOP_CB = sub { 0 }; |
|
|
507 | |
|
|
508 | sub levels { |
|
|
509 | my $ctx = shift; |
|
|
510 | $ctx->[1] = 0; |
|
|
511 | $ctx->[1] |= 1 << $_ |
|
|
512 | for &_lvl_lst; |
|
|
513 | AnyEvent::Log::_reassess; |
|
|
514 | } |
|
|
515 | |
|
|
516 | sub level { |
|
|
517 | my $ctx = shift; |
|
|
518 | my $lvl = $_[0] =~ /^(?:0|off|none)$/ ? 0 : (_lvl_lst $_[0])[-1]; |
|
|
519 | |
|
|
520 | $ctx->[1] = ((1 << $lvl) - 1) << 1; |
|
|
521 | AnyEvent::Log::_reassess; |
|
|
522 | } |
|
|
523 | |
|
|
524 | sub enable { |
|
|
525 | my $ctx = shift; |
|
|
526 | $ctx->[1] |= 1 << $_ |
|
|
527 | for &_lvl_lst; |
|
|
528 | AnyEvent::Log::_reassess; |
|
|
529 | } |
|
|
530 | |
|
|
531 | sub disable { |
|
|
532 | my $ctx = shift; |
|
|
533 | $ctx->[1] &= ~(1 << $_) |
|
|
534 | for &_lvl_lst; |
|
|
535 | AnyEvent::Log::_reassess; |
|
|
536 | } |
|
|
537 | |
|
|
538 | =back |
|
|
539 | |
|
|
540 | =head3 PARENT CONTEXTS |
|
|
541 | |
|
|
542 | The following methods attach and detach another logging context to a |
|
|
543 | logging context. |
|
|
544 | |
|
|
545 | Log messages are propagated to all parent contexts, unless the logging |
|
|
546 | callback consumes the message. |
|
|
547 | |
|
|
548 | =over 4 |
|
|
549 | |
|
|
550 | =item $ctx->attach ($ctx2[, $ctx3...]) |
|
|
551 | |
|
|
552 | Attaches the given contexts as parents to this context. It is not an error |
|
|
553 | to add a context twice (the second add will be ignored). |
|
|
554 | |
|
|
555 | A context can be specified either as package name or as a context object. |
|
|
556 | |
|
|
557 | =item $ctx->detach ($ctx2[, $ctx3...]) |
|
|
558 | |
|
|
559 | Removes the given parents from this context - it's not an error to attempt |
|
|
560 | to remove a context that hasn't been added. |
|
|
561 | |
|
|
562 | A context can be specified either as package name or as a context object. |
|
|
563 | |
|
|
564 | =cut |
|
|
565 | |
|
|
566 | sub attach { |
|
|
567 | my $ctx = shift; |
|
|
568 | |
|
|
569 | $ctx->[2]{$_+0} = $_ |
|
|
570 | for map { AnyEvent::Log::ctx $_ } @_; |
|
|
571 | } |
|
|
572 | |
|
|
573 | sub detach { |
|
|
574 | my $ctx = shift; |
|
|
575 | |
|
|
576 | delete $ctx->[2]{$_+0} |
|
|
577 | for map { AnyEvent::Log::ctx $_ } @_; |
|
|
578 | } |
|
|
579 | |
|
|
580 | =back |
|
|
581 | |
|
|
582 | =head3 MESSAGE LOGGING |
|
|
583 | |
|
|
584 | The following methods configure how the logging context actually does |
|
|
585 | the logging (which consists of formatting the message and printing it or |
|
|
586 | whatever it wants to do with it) and also allows you to log messages |
|
|
587 | directly to a context, without going via your package context. |
|
|
588 | |
|
|
589 | =over 4 |
|
|
590 | |
|
|
591 | =item $ctx->log_cb ($cb->($str)) |
|
|
592 | |
|
|
593 | Replaces the logging callback on the context (C<undef> disables the |
|
|
594 | logging callback). |
|
|
595 | |
|
|
596 | The logging callback is responsible for handling formatted log messages |
|
|
597 | (see C<fmt_cb> below) - normally simple text strings that end with a |
|
|
598 | newline (and are possibly multiline themselves). |
|
|
599 | |
|
|
600 | It also has to return true iff it has consumed the log message, and false |
|
|
601 | if it hasn't. Consuming a message means that it will not be sent to any |
|
|
602 | parent context. When in doubt, return C<0> from your logging callback. |
|
|
603 | |
|
|
604 | Example: a very simple logging callback, simply dump the message to STDOUT |
|
|
605 | and do not consume it. |
|
|
606 | |
|
|
607 | $ctx->log_cb (sub { print STDERR shift; 0 }); |
|
|
608 | |
|
|
609 | You can filter messages by having a log callback that simply returns C<1> |
|
|
610 | and does not do anything with the message, but this counts as "message |
|
|
611 | being logged" and might not be very efficient. |
|
|
612 | |
|
|
613 | Example: propagate all messages except for log levels "debug" and |
|
|
614 | "trace". The messages will still be generated, though, which can slow down |
|
|
615 | your program. |
|
|
616 | |
|
|
617 | $ctx->levels ("debug", "trace"); |
|
|
618 | $ctx->log_cb (sub { 1 }); # do not log, but eat debug and trace messages |
|
|
619 | |
|
|
620 | =item $ctx->fmt_cb ($fmt_cb->($timestamp, $ctx, $level, $message)) |
|
|
621 | |
|
|
622 | Replaces the formatting callback on the context (C<undef> restores the |
|
|
623 | default formatter). |
|
|
624 | |
|
|
625 | The callback is passed the (possibly fractional) timestamp, the original |
|
|
626 | logging context, the (numeric) logging level and the raw message string and needs to |
|
|
627 | return a formatted log message. In most cases this will be a string, but |
|
|
628 | it could just as well be an array reference that just stores the values. |
|
|
629 | |
|
|
630 | Example: format just the raw message, with numeric log level in angle |
|
|
631 | brackets. |
|
|
632 | |
|
|
633 | $ctx->fmt_cb (sub { |
|
|
634 | my ($time, $ctx, $lvl, $msg) = @_; |
|
|
635 | |
|
|
636 | "<$lvl>$msg\n" |
|
|
637 | }); |
|
|
638 | |
|
|
639 | Example: return an array reference with just the log values, and use |
|
|
640 | C<PApp::SQL::sql_exec> to store the emssage in a database. |
|
|
641 | |
|
|
642 | $ctx->fmt_cb (sub { \@_ }); |
|
|
643 | $ctx->log_cb (sub { |
|
|
644 | my ($msg) = @_; |
|
|
645 | |
|
|
646 | sql_exec "insert into log (when, subsys, prio, msg) values (?, ?, ?, ?)", |
|
|
647 | $msg->[0] + 0, |
|
|
648 | "$msg->[1]", |
|
|
649 | $msg->[2] + 0, |
|
|
650 | "$msg->[3]"; |
|
|
651 | |
|
|
652 | 0 |
|
|
653 | }); |
|
|
654 | |
|
|
655 | =cut |
|
|
656 | |
|
|
657 | sub log_cb { |
|
|
658 | my ($ctx, $cb) = @_; |
|
|
659 | |
|
|
660 | $ctx->[3] = $cb; |
|
|
661 | } |
|
|
662 | |
|
|
663 | sub fmt_cb { |
|
|
664 | my ($ctx, $cb) = @_; |
|
|
665 | |
|
|
666 | $ctx->[4] = $cb; |
|
|
667 | } |
|
|
668 | |
|
|
669 | =item $ctx->log ($level, $msg[, @params]) |
|
|
670 | |
|
|
671 | Same as C<AnyEvent::Log::log>, but uses the given context as log context. |
|
|
672 | |
|
|
673 | =item $logger = $ctx->logger ($level[, \$enabled]) |
|
|
674 | |
|
|
675 | Same as C<AnyEvent::Log::logger>, but uses the given context as log |
|
|
676 | context. |
|
|
677 | |
|
|
678 | =cut |
|
|
679 | |
|
|
680 | *log = \&AnyEvent::Log::_log; |
|
|
681 | *logger = \&AnyEvent::Log::_logger; |
139 | |
682 | |
140 | 1; |
683 | 1; |
141 | |
684 | |
142 | =back |
685 | =back |
143 | |
686 | |