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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 | #TODO: config |
25 | Configuration (also look at the EXAMPLES section): |
24 | #TODO: ctx () becomes caller[0]... |
26 | |
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27 | # set logging for the current package to errors and higher only |
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28 | AnyEvent::Log::ctx->level ("error"); |
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29 | |
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30 | # set logging level to suppress anything below "notice" |
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31 | $AnyEvent::Log::FILTER->level ("notice"); |
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32 | |
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33 | # send all critical and higher priority messages to syslog, |
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34 | # regardless of (most) other settings |
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35 | $AnyEvent::Log::COLLECT->attach (new AnyEvent::Log::Ctx |
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36 | level => "critical", |
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37 | log_to_syslog => 0, |
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38 | ); |
25 | |
39 | |
26 | =head1 DESCRIPTION |
40 | =head1 DESCRIPTION |
27 | |
41 | |
28 | This module implements a relatively simple "logging framework". It doesn't |
42 | This module implements a relatively simple "logging framework". It doesn't |
29 | 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 |
30 | AnyEvent - AnyEvent simply creates logging messages internally, and this |
44 | AnyEvent - AnyEvent simply creates logging messages internally, and this |
31 | 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 |
32 | using it from other modules as well. |
46 | using it from other modules as well. |
33 | |
47 | |
34 | 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 |
35 | logged, ever, unless you set C<PERL_ANYEVENT_VERBOSE> to a higher number |
49 | will be logged, unless you set C<PERL_ANYEVENT_VERBOSE> to a higher number |
36 | before starting your program.#TODO |
50 | before starting your program, or change the logging level at runtime with |
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51 | something like: |
37 | |
52 | |
38 | Possible future extensions are to allow custom log targets (where the |
53 | use AnyEvent::Log; |
39 | level is an object), log filtering based on package, formatting, aliasing |
54 | $AnyEvent::Log::FILTER->level ("info"); |
40 | or package groups. |
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41 | |
55 | |
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56 | The design goal behind this module was to keep it simple (and small), |
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57 | but make it powerful enough to be potentially useful for any module, and |
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58 | extensive enough for the most common tasks, such as logging to multiple |
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59 | targets, or being able to log into a database. |
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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 | |
42 | =head1 LOG FUNCTIONS |
99 | =head1 LOGGING FUNCTIONS |
43 | |
100 | |
44 | 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 |
45 | 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 |
46 | 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 |
47 | loaded. |
104 | loaded. |
48 | |
105 | |
49 | =over 4 |
106 | =over 4 |
50 | |
107 | |
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54 | |
111 | |
55 | use Carp (); |
112 | use Carp (); |
56 | use POSIX (); |
113 | use POSIX (); |
57 | |
114 | |
58 | use AnyEvent (); BEGIN { AnyEvent::common_sense } |
115 | use AnyEvent (); BEGIN { AnyEvent::common_sense } |
59 | 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, $LOG); |
60 | |
121 | |
61 | our ($now_int, $now_str1, $now_str2); |
122 | our ($now_int, $now_str1, $now_str2); |
62 | |
123 | |
63 | # Format Time, not public - yet? |
124 | # Format Time, not public - yet? |
64 | sub ft($) { |
125 | sub ft($) { |
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69 | if $now_int != $i; |
130 | if $now_int != $i; |
70 | |
131 | |
71 | "$now_str1$f$now_str2" |
132 | "$now_str1$f$now_str2" |
72 | } |
133 | } |
73 | |
134 | |
74 | our %CTX; # all logging contexts |
135 | our %CTX; # all package contexts |
75 | |
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76 | my $default_log_cb = sub { 0 }; |
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77 | |
136 | |
78 | # creates a default package context object for the given package |
137 | # creates a default package context object for the given package |
79 | sub _pkg_ctx($) { |
138 | sub _pkg_ctx($) { |
80 | my $ctx = bless [$_[0], 0, {}, $default_log_cb], "AnyEvent::Log::Ctx"; |
139 | my $ctx = bless [$_[0], (1 << 10) - 1 - 1, {}], "AnyEvent::Log::Ctx"; |
81 | |
140 | |
82 | # link "parent" package |
141 | # link "parent" package |
83 | my $pkg = $_[0] =~ /^(.+)::/ ? $1 : ""; |
142 | my $parent = $_[0] =~ /^(.+)::/ |
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143 | ? $CTX{$1} ||= &_pkg_ctx ("$1") |
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144 | : $COLLECT; |
84 | |
145 | |
85 | $pkg = $CTX{$pkg} ||= &_pkg_ctx ($pkg); |
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86 | $ctx->[2]{$pkg+0} = $pkg; |
146 | $ctx->[2]{$parent+0} = $parent; |
87 | |
147 | |
88 | $ctx |
148 | $ctx |
89 | } |
149 | } |
90 | |
150 | |
91 | =item AnyEvent::Log::log $level, $msg[, @args] |
151 | =item AnyEvent::Log::log $level, $msg[, @args] |
92 | |
152 | |
93 | Requests logging of the given C<$msg> with the given log level (1..9). |
153 | Requests logging of the given C<$msg> with the given log level, and |
94 | You can also use the following strings as log level: C<fatal> (1), |
154 | returns true if the message was logged I<somewhere>. |
95 | C<alert> (2), C<critical> (3), C<error> (4), C<warn> (5), C<note> (6), |
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96 | C<info> (7), C<debug> (8), C<trace> (9). |
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97 | |
155 | |
98 | For C<fatal> log levels, the program will abort. |
156 | For C<fatal> log levels, the program will abort. |
99 | |
157 | |
100 | If only a C<$msg> is given, it is logged as-is. With extra C<@args>, the |
158 | If only a C<$msg> is given, it is logged as-is. With extra C<@args>, the |
101 | C<$msg> is interpreted as an sprintf format string. |
159 | C<$msg> is interpreted as an sprintf format string. |
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107 | 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 |
108 | 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 |
109 | message in the first place. |
167 | message in the first place. |
110 | |
168 | |
111 | 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 |
112 | 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. |
113 | |
174 | |
114 | 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 |
115 | 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 |
116 | need any additional functionality), as those functions will load the |
177 | need any additional functionality), as those functions will load the |
117 | 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. |
118 | |
179 | |
119 | Also, if you otpionally generate a lot of debug messages (such as when |
180 | Also, if you optionally generate a lot of debug messages (such as when |
120 | tracing some code), you should look into using a logger callback and a |
181 | tracing some code), you should look into using a logger callback and a |
121 | boolean enabler (see C<logger>, below). |
182 | boolean enabler (see C<logger>, below). |
122 | |
183 | |
123 | Example: log something at error level. |
184 | Example: log something at error level. |
124 | |
185 | |
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134 | |
195 | |
135 | =cut |
196 | =cut |
136 | |
197 | |
137 | # also allow syslog equivalent names |
198 | # also allow syslog equivalent names |
138 | our %STR2LEVEL = ( |
199 | our %STR2LEVEL = ( |
139 | fatal => 1, emerg => 1, |
200 | fatal => 1, emerg => 1, exit => 1, |
140 | alert => 2, |
201 | alert => 2, |
141 | critical => 3, crit => 3, |
202 | critical => 3, crit => 3, |
142 | error => 4, err => 4, |
203 | error => 4, err => 4, die => 4, |
143 | warn => 5, warning => 5, |
204 | warn => 5, warning => 5, |
144 | note => 6, notice => 6, |
205 | note => 6, notice => 6, |
145 | info => 7, |
206 | info => 7, |
146 | debug => 8, |
207 | debug => 8, |
147 | trace => 9, |
208 | trace => 9, |
148 | ); |
209 | ); |
149 | |
210 | |
150 | sub now () { time } |
211 | sub now () { time } |
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212 | |
151 | AnyEvent::post_detect { |
213 | AnyEvent::post_detect { |
152 | *now = \&AE::now; |
214 | *now = \&AE::now; |
153 | }; |
215 | }; |
154 | |
216 | |
155 | our @LEVEL2STR = qw(0 fatal alert crit error warn note info debug trace); |
217 | our @LEVEL2STR = qw(0 fatal alert crit error warn note info debug trace); |
156 | |
218 | |
157 | # time, ctx, level, msg |
219 | # time, ctx, level, msg |
158 | sub _format($$$$) { |
220 | sub _format($$$$) { |
159 | my $pfx = ft $_[0]; |
221 | my $ts = ft $_[0]; |
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222 | my $ct = " "; |
160 | |
223 | |
161 | join "", |
224 | my @res; |
162 | map "$pfx $_\n", |
225 | |
163 | split /\n/, |
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164 | sprintf "%-5s %s: %s", $LEVEL2STR[$_[2]], $_[1][0], $_[3] |
226 | for (split /\n/, sprintf "%-5s %s: %s", $LEVEL2STR[$_[2]], $_[1][0], $_[3]) { |
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227 | push @res, "$ts$ct$_\n"; |
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228 | $ct = " + "; |
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229 | } |
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230 | |
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231 | join "", @res |
165 | } |
232 | } |
166 | |
233 | |
167 | sub _log { |
234 | sub _log { |
168 | my ($ctx, $level, $format, @args) = @_; |
235 | my ($ctx, $level, $format, @args) = @_; |
169 | |
236 | |
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237 | $level = $level > 0 && $level <= 9 |
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238 | ? $level+0 |
170 | $level = $level > 0 && $level <= 9 ? $level+0 : $STR2LEVEL{$level} || Carp::croak "$level: not a valid logging level, caught"; |
239 | : $STR2LEVEL{$level} || Carp::croak "$level: not a valid logging level, caught"; |
171 | |
240 | |
172 | my $mask = 1 << $level; |
241 | my $mask = 1 << $level; |
173 | my $now = AE::now; |
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174 | |
242 | |
175 | my (@ctx, $did_format, $fmt); |
243 | my ($success, %seen, @ctx, $now, $fmt); |
176 | |
244 | |
177 | do { |
245 | do |
178 | if ($ctx->[1] & $mask) { |
246 | { |
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247 | # skip if masked |
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248 | if ($ctx->[1] & $mask && !$seen{$ctx+0}++) { |
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249 | if ($ctx->[3]) { |
179 | # logging target found |
250 | # logging target found |
180 | |
251 | |
181 | # get raw message |
252 | # now get raw message, unless we have it already |
182 | unless ($did_format) { |
253 | unless ($now) { |
183 | $format = $format->() if ref $format; |
254 | $format = $format->() if ref $format; |
184 | $format = sprintf $format, @args if @args; |
255 | $format = sprintf $format, @args if @args; |
185 | $format =~ s/\n$//; |
256 | $format =~ s/\n$//; |
186 | $did_format = 1; |
257 | $now = now; |
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258 | }; |
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259 | |
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260 | # format msg |
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261 | my $str = $ctx->[4] |
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262 | ? $ctx->[4]($now, $_[0], $level, $format) |
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263 | : ($fmt ||= _format $now, $_[0], $level, $format); |
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264 | |
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265 | $success = 1; |
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266 | |
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267 | $ctx->[3]($str) |
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268 | or push @ctx, values %{ $ctx->[2] }; # not consumed - propagate |
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269 | } else { |
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270 | push @ctx, values %{ $ctx->[2] }; # not masked - propagate |
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271 | } |
187 | }; |
272 | } |
188 | |
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189 | # format msg |
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190 | my $str = $ctx->[4] |
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191 | ? $ctx->[4]($now, $_[0], $level, $format) |
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192 | : $fmt ||= _format $now, $_[0], $level, $format; |
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193 | |
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194 | $ctx->[3]($str) |
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195 | and next; |
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196 | } |
273 | } |
197 | |
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198 | # not consume - push parent contexts |
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199 | push @ctx, values %{ $ctx->[2] }; |
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200 | } while $ctx = pop @ctx; |
274 | while $ctx = pop @ctx; |
201 | |
275 | |
202 | exit 1 if $level <= 1; |
276 | exit 1 if $level <= 1; |
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277 | |
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278 | $success |
203 | } |
279 | } |
204 | |
280 | |
205 | sub log($$;@) { |
281 | sub log($$;@) { |
206 | _log |
282 | _log |
207 | $CTX{ (caller)[0] } ||= _pkg_ctx +(caller)[0], |
283 | $CTX{ (caller)[0] } ||= _pkg_ctx +(caller)[0], |
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211 | *AnyEvent::log = *AE::log = \&log; |
287 | *AnyEvent::log = *AE::log = \&log; |
212 | |
288 | |
213 | =item $logger = AnyEvent::Log::logger $level[, \$enabled] |
289 | =item $logger = AnyEvent::Log::logger $level[, \$enabled] |
214 | |
290 | |
215 | Creates a code reference that, when called, acts as if the |
291 | Creates a code reference that, when called, acts as if the |
216 | C<AnyEvent::Log::log> function was called at this point with the givne |
292 | C<AnyEvent::Log::log> function was called at this point with the given |
217 | level. C<$logger> is passed a C<$msg> and optional C<@args>, just as with |
293 | level. C<$logger> is passed a C<$msg> and optional C<@args>, just as with |
218 | the C<AnyEvent::Log::log> function: |
294 | the C<AnyEvent::Log::log> function: |
219 | |
295 | |
220 | my $debug_log = AnyEvent::Log::logger "debug"; |
296 | my $debug_log = AnyEvent::Log::logger "debug"; |
221 | |
297 | |
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246 | # and later in your program |
322 | # and later in your program |
247 | $debug_log->("yo, stuff here") if $debug; |
323 | $debug_log->("yo, stuff here") if $debug; |
248 | |
324 | |
249 | $debug and $debug_log->("123"); |
325 | $debug and $debug_log->("123"); |
250 | |
326 | |
251 | Note: currently the enabled var is always true - that will be fixed in a |
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252 | future version :) |
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253 | |
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254 | =cut |
327 | =cut |
255 | |
328 | |
256 | our %LOGGER; |
329 | our %LOGGER; |
257 | |
330 | |
258 | # re-assess logging status for all loggers |
331 | # re-assess logging status for all loggers |
259 | sub _reassess { |
332 | sub _reassess { |
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333 | local $SIG{__DIE__}; |
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334 | my $die = sub { die }; |
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335 | |
260 | for (@_ ? $LOGGER{$_[0]} : values %LOGGER) { |
336 | for (@_ ? $LOGGER{$_[0]} : values %LOGGER) { |
261 | my ($ctx, $level, $renabled) = @$_; |
337 | my ($ctx, $level, $renabled) = @$_; |
262 | |
338 | |
263 | # to detetc whether a message would be logged, we # actually |
339 | # to detect whether a message would be logged, we actually |
264 | # try to log one and die. this isn't # fast, but we can be |
340 | # try to log one and die. this isn't fast, but we can be |
265 | # sure that the logging decision is correct :) |
341 | # sure that the logging decision is correct :) |
266 | |
342 | |
267 | $$renabled = !eval { |
343 | $$renabled = !eval { |
268 | local $SIG{__DIE__}; |
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269 | |
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270 | _log $ctx, $level, sub { die }; |
344 | _log $ctx, $level, $die; |
271 | |
345 | |
272 | 1 |
346 | 1 |
273 | }; |
347 | }; |
274 | |
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275 | $$renabled = 1; # TODO |
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276 | } |
348 | } |
277 | } |
349 | } |
278 | |
350 | |
279 | sub _logger($;$) { |
351 | sub _logger { |
280 | my ($ctx, $level, $renabled) = @_; |
352 | my ($ctx, $level, $renabled) = @_; |
281 | |
353 | |
282 | $renabled ||= \my $enabled; |
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283 | |
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284 | $$renabled = 1; |
354 | $$renabled = 1; |
285 | |
355 | |
286 | my $logger = [$ctx, $level, $renabled]; |
356 | my $logger = [$ctx, $level, $renabled]; |
287 | |
357 | |
288 | $LOGGER{$logger+0} = $logger; |
358 | $LOGGER{$logger+0} = $logger; |
289 | |
359 | |
290 | _reassess $logger+0; |
360 | _reassess $logger+0; |
291 | |
361 | |
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362 | require AnyEvent::Util; |
292 | my $guard = AnyEvent::Util::guard { |
363 | my $guard = AnyEvent::Util::guard (sub { |
293 | # "clean up" |
364 | # "clean up" |
294 | delete $LOGGER{$logger+0}; |
365 | delete $LOGGER{$logger+0}; |
295 | }; |
366 | }); |
296 | |
367 | |
297 | sub { |
368 | sub { |
298 | $guard if 0; # keep guard alive, but don't cause runtime overhead |
369 | $guard if 0; # keep guard alive, but don't cause runtime overhead |
299 | |
370 | |
300 | _log $ctx, $level, @_ |
371 | _log $ctx, $level, @_ |
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306 | _logger |
377 | _logger |
307 | $CTX{ (caller)[0] } ||= _pkg_ctx +(caller)[0], |
378 | $CTX{ (caller)[0] } ||= _pkg_ctx +(caller)[0], |
308 | @_ |
379 | @_ |
309 | } |
380 | } |
310 | |
381 | |
311 | #TODO |
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312 | |
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313 | =back |
382 | =back |
314 | |
383 | |
315 | =head1 CONFIGURATION FUNCTIONALITY |
384 | =head1 LOGGING CONTEXTS |
316 | |
385 | |
317 | None, yet, except for C<PERL_ANYEVENT_VERBOSE>, described in the L<AnyEvent> manpage. |
386 | This module associates every log message with a so-called I<logging |
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387 | context>, based on the package of the caller. Every perl package has its |
|
|
388 | own logging context. |
318 | |
389 | |
319 | #TODO: wahst a context |
390 | A logging context has three major responsibilities: filtering, logging and |
320 | #TODO |
391 | propagating the message. |
|
|
392 | |
|
|
393 | For the first purpose, filtering, each context has a set of logging |
|
|
394 | levels, called the log level mask. Messages not in the set will be ignored |
|
|
395 | by this context (masked). |
|
|
396 | |
|
|
397 | For logging, the context stores a formatting callback (which takes the |
|
|
398 | timestamp, context, level and string message and formats it in the way |
|
|
399 | it should be logged) and a logging callback (which is responsible for |
|
|
400 | actually logging the formatted message and telling C<AnyEvent::Log> |
|
|
401 | whether it has consumed the message, or whether it should be propagated). |
|
|
402 | |
|
|
403 | For propagation, a context can have any number of attached I<slave |
|
|
404 | contexts>. Any message that is neither masked by the logging mask nor |
|
|
405 | masked by the logging callback returning true will be passed to all slave |
|
|
406 | contexts. |
|
|
407 | |
|
|
408 | Each call to a logging function will log the message at most once per |
|
|
409 | context, so it does not matter (much) if there are cycles or if the |
|
|
410 | message can arrive at the same context via multiple paths. |
|
|
411 | |
|
|
412 | =head2 DEFAULTS |
|
|
413 | |
|
|
414 | By default, all logging contexts have an full set of log levels ("all"), a |
|
|
415 | disabled logging callback and the default formatting callback. |
|
|
416 | |
|
|
417 | Package contexts have the package name as logging title by default. |
|
|
418 | |
|
|
419 | They have exactly one slave - the context of the "parent" package. The |
|
|
420 | parent package is simply defined to be the package name without the last |
|
|
421 | component, i.e. C<AnyEvent::Debug::Wrapped> becomes C<AnyEvent::Debug>, |
|
|
422 | and C<AnyEvent> becomes ... C<$AnyEvent::Log::COLLECT> which is the |
|
|
423 | exception of the rule - just like the "parent" of any single-component |
|
|
424 | package name in Perl is C<main>, the default slave of any top-level |
|
|
425 | package context is C<$AnyEvent::Log::COLLECT>. |
|
|
426 | |
|
|
427 | Since perl packages form only an approximate hierarchy, this slave |
|
|
428 | context can of course be removed. |
|
|
429 | |
|
|
430 | All other (anonymous) contexts have no slaves and an empty title by |
|
|
431 | default. |
|
|
432 | |
|
|
433 | When the module is loaded it creates the C<$AnyEvent::Log::LOG> logging |
|
|
434 | context that simply logs everything via C<warn>, without propagating |
|
|
435 | anything anywhere by default. The purpose of this context is to provide |
|
|
436 | a convenient place to override the global logging target or to attach |
|
|
437 | additional log targets. It's not meant for filtering. |
|
|
438 | |
|
|
439 | It then creates the C<$AnyEvent::Log::FILTER> context whose |
|
|
440 | purpose is to suppress all messages with priority higher |
|
|
441 | than C<$ENV{PERL_ANYEVENT_VERBOSE}>. It then attached the |
|
|
442 | C<$AnyEvent::Log::LOG> context to it. The purpose of the filter context |
|
|
443 | is to simply provide filtering according to some global log level. |
|
|
444 | |
|
|
445 | Finally it creates the top-level package context C<$AnyEvent::Log::COLLECT> |
|
|
446 | and attaches the C<$AnyEvent::Log::FILTER> context to it, but otherwise |
|
|
447 | leaves it at default config. Its purpose is simply to collect all log |
|
|
448 | messages system-wide. |
|
|
449 | |
|
|
450 | The hierarchy is then: |
|
|
451 | |
|
|
452 | any package, eventually -> $COLLECT -> $FILTER -> $LOG |
|
|
453 | |
|
|
454 | The effect of all this is that log messages, by default, wander up to the |
|
|
455 | C<$AnyEvent::Log::COLLECT> context where all messages normally end up, |
|
|
456 | from there to C<$AnyEvent::Log::FILTER> where log messages with lower |
|
|
457 | priority then C<$ENV{PERL_ANYEVENT_VERBOSE}> will be filtered out and then |
|
|
458 | to the C<$AnyEvent::Log::LOG> context to be passed to C<warn>. |
|
|
459 | |
|
|
460 | This makes it easy to set a global logging level (by modifying $FILTER), |
|
|
461 | but still allow other contexts to send, for example, their debug and trace |
|
|
462 | messages to the $LOG target despite the global logging level, or to attach |
|
|
463 | additional log targets that log messages, regardless of the global logging |
|
|
464 | level. |
|
|
465 | |
|
|
466 | It also makes it easy to modify the default warn-logger ($LOG) to |
|
|
467 | something that logs to a file, or to attach additional logging targets |
|
|
468 | (such as loggign to a file) by attaching it to $FILTER. |
|
|
469 | |
|
|
470 | =head2 CREATING/FINDING/DESTROYING CONTEXTS |
321 | |
471 | |
322 | =over 4 |
472 | =over 4 |
323 | |
473 | |
324 | =item $ctx = AnyEvent::Log::ctx [$pkg] |
474 | =item $ctx = AnyEvent::Log::ctx [$pkg] |
325 | |
475 | |
326 | Returns a I<config> object for the given package name. |
476 | This function creates or returns a logging context (which is an object). |
327 | |
477 | |
328 | If no package name is given, returns the context for the current perl |
478 | If a package name is given, then the context for that packlage is |
|
|
479 | returned. If it is called without any arguments, then the context for the |
329 | package (i.e. the same context as a C<AE::log> call would use). |
480 | callers package is returned (i.e. the same context as a C<AE::log> call |
|
|
481 | would use). |
330 | |
482 | |
331 | If C<undef> is given, then it creates a new anonymous context that is not |
483 | If C<undef> is given, then it creates a new anonymous context that is not |
332 | tied to any package and is destroyed when no longer referenced. |
484 | tied to any package and is destroyed when no longer referenced. |
333 | |
485 | |
334 | =cut |
486 | =cut |
… | |
… | |
338 | |
490 | |
339 | ref $pkg |
491 | ref $pkg |
340 | ? $pkg |
492 | ? $pkg |
341 | : defined $pkg |
493 | : defined $pkg |
342 | ? $CTX{$pkg} ||= AnyEvent::Log::_pkg_ctx $pkg |
494 | ? $CTX{$pkg} ||= AnyEvent::Log::_pkg_ctx $pkg |
343 | : bless [undef, 0, undef, $default_log_cb], "AnyEvent::Log::Ctx" |
495 | : bless [undef, (1 << 10) - 1 - 1], "AnyEvent::Log::Ctx" |
344 | } |
496 | } |
345 | |
497 | |
346 | # create default root context |
498 | =item AnyEvent::Log::reset |
347 | { |
499 | |
348 | my $root = ctx undef; |
500 | Resets all package contexts and recreates the default hierarchy if |
349 | $root->[0] = ""; |
501 | necessary, i.e. resets the logging subsystem to defaults, as much as |
350 | $root->title ("default"); |
502 | possible. This process keeps references to contexts held by other parts of |
|
|
503 | the program intact. |
|
|
504 | |
|
|
505 | This can be used to implement config-file (re-)loading: before loading a |
|
|
506 | configuration, reset all contexts. |
|
|
507 | |
|
|
508 | =cut |
|
|
509 | |
|
|
510 | sub reset { |
|
|
511 | # hard to kill complex data structures |
|
|
512 | # we "recreate" all package loggers and reset the hierarchy |
|
|
513 | while (my ($k, $v) = each %CTX) { |
|
|
514 | @$v = ($k, (1 << 10) - 1 - 1, { }); |
|
|
515 | |
|
|
516 | $v->attach ($k =~ /^(.+)::/ ? $CTX{$1} : $AnyEvent::Log::COLLECT); |
|
|
517 | } |
|
|
518 | |
|
|
519 | @$_ = ($_->[0], (1 << 10) - 1 - 1) |
|
|
520 | for $LOG, $FILTER, $COLLECT; |
|
|
521 | |
|
|
522 | #$LOG->slaves; |
|
|
523 | $LOG->title ('$AnyEvent::Log::LOG'); |
|
|
524 | $LOG->log_to_warn; |
|
|
525 | |
|
|
526 | $FILTER->slaves ($LOG); |
|
|
527 | $FILTER->title ('$AnyEvent::Log::FILTER'); |
351 | $root->level ($AnyEvent::VERBOSE); |
528 | $FILTER->level ($AnyEvent::VERBOSE); |
352 | $root->log_cb (sub { |
529 | |
353 | print STDERR shift; |
530 | $COLLECT->slaves ($FILTER); |
354 | 0 |
531 | $COLLECT->title ('$AnyEvent::Log::COLLECT'); |
355 | }); |
532 | |
356 | $CTX{""} = $root; |
533 | _reassess; |
357 | } |
534 | } |
|
|
535 | |
|
|
536 | # create the default logger contexts |
|
|
537 | $LOG = ctx undef; |
|
|
538 | $FILTER = ctx undef; |
|
|
539 | $COLLECT = ctx undef; |
|
|
540 | |
|
|
541 | AnyEvent::Log::reset; |
|
|
542 | |
|
|
543 | # hello, CPAN, please catch me |
|
|
544 | package AnyEvent::Log::LOG; |
|
|
545 | package AE::Log::LOG; |
|
|
546 | package AnyEvent::Log::FILTER; |
|
|
547 | package AE::Log::FILTER; |
|
|
548 | package AnyEvent::Log::COLLECT; |
|
|
549 | package AE::Log::COLLECT; |
358 | |
550 | |
359 | package AnyEvent::Log::Ctx; |
551 | package AnyEvent::Log::Ctx; |
360 | |
552 | |
361 | # 0 1 2 3 4 |
553 | # 0 1 2 3 4 |
362 | # [$title, $level, %$parents, &$logcb, &$fmtcb] |
554 | # [$title, $level, %$slaves, &$logcb, &$fmtcb] |
|
|
555 | |
|
|
556 | =item $ctx = new AnyEvent::Log::Ctx methodname => param... |
|
|
557 | |
|
|
558 | This is a convenience constructor that makes it simpler to construct |
|
|
559 | anonymous logging contexts. |
|
|
560 | |
|
|
561 | Each key-value pair results in an invocation of the method of the same |
|
|
562 | name as the key with the value as parameter, unless the value is an |
|
|
563 | arrayref, in which case it calls the method with the contents of the |
|
|
564 | array. The methods are called in the same order as specified. |
|
|
565 | |
|
|
566 | Example: create a new logging context and set both the default logging |
|
|
567 | level, some slave contexts and a logging callback. |
|
|
568 | |
|
|
569 | $ctx = new AnyEvent::Log::Ctx |
|
|
570 | title => "dubious messages", |
|
|
571 | level => "error", |
|
|
572 | log_cb => sub { print STDOUT shift; 0 }, |
|
|
573 | slaves => [$ctx1, $ctx, $ctx2], |
|
|
574 | ; |
|
|
575 | |
|
|
576 | =back |
|
|
577 | |
|
|
578 | =cut |
|
|
579 | |
|
|
580 | sub new { |
|
|
581 | my $class = shift; |
|
|
582 | |
|
|
583 | my $ctx = AnyEvent::Log::ctx undef; |
|
|
584 | |
|
|
585 | while (@_) { |
|
|
586 | my ($k, $v) = splice @_, 0, 2; |
|
|
587 | $ctx->$k (ref $v eq "ARRAY" ? @$v : $v); |
|
|
588 | } |
|
|
589 | |
|
|
590 | bless $ctx, $class # do we really support subclassing, hmm? |
|
|
591 | } |
|
|
592 | |
|
|
593 | |
|
|
594 | =head2 CONFIGURING A LOG CONTEXT |
|
|
595 | |
|
|
596 | The following methods can be used to configure the logging context. |
|
|
597 | |
|
|
598 | =over 4 |
363 | |
599 | |
364 | =item $ctx->title ([$new_title]) |
600 | =item $ctx->title ([$new_title]) |
365 | |
601 | |
366 | Returns the title of the logging context - this is the package name, for |
602 | Returns the title of the logging context - this is the package name, for |
367 | package contexts, and a user defined string for all others. |
603 | package contexts, and a user defined string for all others. |
… | |
… | |
373 | sub title { |
609 | sub title { |
374 | $_[0][0] = $_[1] if @_ > 1; |
610 | $_[0][0] = $_[1] if @_ > 1; |
375 | $_[0][0] |
611 | $_[0][0] |
376 | } |
612 | } |
377 | |
613 | |
|
|
614 | =back |
|
|
615 | |
|
|
616 | =head3 LOGGING LEVELS |
|
|
617 | |
|
|
618 | The following methods deal with the logging level set associated with the |
|
|
619 | log context. |
|
|
620 | |
|
|
621 | The most common method to use is probably C<< $ctx->level ($level) >>, |
|
|
622 | which configures the specified and any higher priority levels. |
|
|
623 | |
|
|
624 | All functions which accept a list of levels also accept the special string |
|
|
625 | C<all> which expands to all logging levels. |
|
|
626 | |
|
|
627 | =over 4 |
|
|
628 | |
378 | =item $ctx->levels ($level[, $level...) |
629 | =item $ctx->levels ($level[, $level...) |
379 | |
630 | |
380 | Enables logging fot the given levels and disables it for all others. |
631 | Enables logging for the given levels and disables it for all others. |
381 | |
632 | |
382 | =item $ctx->level ($level) |
633 | =item $ctx->level ($level) |
383 | |
634 | |
384 | Enables logging for the given level and all lower level (higher priority) |
635 | Enables logging for the given level and all lower level (higher priority) |
385 | ones. Specifying a level of C<0> or C<off> disables all logging for this |
636 | ones. In addition to normal logging levels, specifying a level of C<0> or |
386 | level. |
637 | C<off> disables all logging for this level. |
387 | |
638 | |
388 | Example: log warnings, errors and higher priority messages. |
639 | Example: log warnings, errors and higher priority messages. |
389 | |
640 | |
390 | $ctx->level ("warn"); |
641 | $ctx->level ("warn"); |
391 | $ctx->level (5); # same thing, just numeric |
642 | $ctx->level (5); # same thing, just numeric |
… | |
… | |
399 | Disables logging for the given levels, leaving all others unchanged. |
650 | Disables logging for the given levels, leaving all others unchanged. |
400 | |
651 | |
401 | =cut |
652 | =cut |
402 | |
653 | |
403 | sub _lvl_lst { |
654 | sub _lvl_lst { |
|
|
655 | map { |
|
|
656 | $_ > 0 && $_ <= 9 ? $_+0 |
|
|
657 | : $_ eq "all" ? (1 .. 9) |
404 | map { $_ > 0 && $_ <= 9 ? $_+0 : $STR2LEVEL{$_} || Carp::croak "$_: not a valid logging level, caught" } |
658 | : $STR2LEVEL{$_} || Carp::croak "$_: not a valid logging level, caught" |
405 | @_ |
659 | } @_ |
406 | } |
660 | } |
407 | |
661 | |
408 | our $NOP_CB = sub { 0 }; |
662 | our $NOP_CB = sub { 0 }; |
409 | |
663 | |
410 | sub levels { |
664 | sub levels { |
… | |
… | |
415 | AnyEvent::Log::_reassess; |
669 | AnyEvent::Log::_reassess; |
416 | } |
670 | } |
417 | |
671 | |
418 | sub level { |
672 | sub level { |
419 | my $ctx = shift; |
673 | my $ctx = shift; |
420 | my $lvl = $_[0] =~ /^(?:0|off|none)$/ ? 0 : (_lvl_lst $_[0])[0]; |
674 | my $lvl = $_[0] =~ /^(?:0|off|none)$/ ? 0 : (_lvl_lst $_[0])[-1]; |
|
|
675 | |
421 | $ctx->[1] = ((1 << $lvl) - 1) << 1; |
676 | $ctx->[1] = ((1 << $lvl) - 1) << 1; |
422 | AnyEvent::Log::_reassess; |
677 | AnyEvent::Log::_reassess; |
423 | } |
678 | } |
424 | |
679 | |
425 | sub enable { |
680 | sub enable { |
… | |
… | |
434 | $ctx->[1] &= ~(1 << $_) |
689 | $ctx->[1] &= ~(1 << $_) |
435 | for &_lvl_lst; |
690 | for &_lvl_lst; |
436 | AnyEvent::Log::_reassess; |
691 | AnyEvent::Log::_reassess; |
437 | } |
692 | } |
438 | |
693 | |
|
|
694 | =back |
|
|
695 | |
|
|
696 | =head3 SLAVE CONTEXTS |
|
|
697 | |
|
|
698 | The following methods attach and detach another logging context to a |
|
|
699 | logging context. |
|
|
700 | |
|
|
701 | Log messages are propagated to all slave contexts, unless the logging |
|
|
702 | callback consumes the message. |
|
|
703 | |
|
|
704 | =over 4 |
|
|
705 | |
439 | =item $ctx->attach ($ctx2[, $ctx3...]) |
706 | =item $ctx->attach ($ctx2[, $ctx3...]) |
440 | |
707 | |
441 | Attaches the given contexts as parents to this context. It is not an error |
708 | Attaches the given contexts as slaves to this context. It is not an error |
442 | to add a context twice (the second add will be ignored). |
709 | to add a context twice (the second add will be ignored). |
443 | |
710 | |
444 | A context can be specified either as package name or as a context object. |
711 | A context can be specified either as package name or as a context object. |
445 | |
712 | |
446 | =item $ctx->detach ($ctx2[, $ctx3...]) |
713 | =item $ctx->detach ($ctx2[, $ctx3...]) |
447 | |
714 | |
448 | Removes the given parents from this context - it's not an error to attempt |
715 | Removes the given slaves from this context - it's not an error to attempt |
449 | to remove a context that hasn't been added. |
716 | to remove a context that hasn't been added. |
450 | |
717 | |
451 | A context can be specified either as package name or as a context object. |
718 | A context can be specified either as package name or as a context object. |
|
|
719 | |
|
|
720 | =item $ctx->slaves ($ctx2[, $ctx3...]) |
|
|
721 | |
|
|
722 | Replaces all slaves attached to this context by the ones given. |
452 | |
723 | |
453 | =cut |
724 | =cut |
454 | |
725 | |
455 | sub attach { |
726 | sub attach { |
456 | my $ctx = shift; |
727 | my $ctx = shift; |
… | |
… | |
464 | |
735 | |
465 | delete $ctx->[2]{$_+0} |
736 | delete $ctx->[2]{$_+0} |
466 | for map { AnyEvent::Log::ctx $_ } @_; |
737 | for map { AnyEvent::Log::ctx $_ } @_; |
467 | } |
738 | } |
468 | |
739 | |
|
|
740 | sub slaves { |
|
|
741 | undef $_[0][2]; |
|
|
742 | &attach; |
|
|
743 | } |
|
|
744 | |
|
|
745 | =back |
|
|
746 | |
|
|
747 | =head3 LOG TARGETS |
|
|
748 | |
|
|
749 | The following methods configure how the logging context actually does |
|
|
750 | the logging (which consists of formatting the message and printing it or |
|
|
751 | whatever it wants to do with it). |
|
|
752 | |
|
|
753 | =over 4 |
|
|
754 | |
469 | =item $ctx->log_cb ($cb->($str)) |
755 | =item $ctx->log_cb ($cb->($str) |
470 | |
756 | |
471 | Replaces the logging callback on the context (C<undef> disables the |
757 | Replaces the logging callback on the context (C<undef> disables the |
472 | logging callback). |
758 | logging callback). |
473 | |
759 | |
474 | The logging callback is responsible for handling formatted log messages |
760 | The logging callback is responsible for handling formatted log messages |
475 | (see C<fmt_cb> below) - normally simple text strings that end with a |
761 | (see C<fmt_cb> below) - normally simple text strings that end with a |
476 | newline (and are possibly multiline themselves). |
762 | newline (and are possibly multiline themselves). |
477 | |
763 | |
478 | It also has to return true iff it has consumed the log message, and false |
764 | It also has to return true iff it has consumed the log message, and false |
479 | if it hasn't. Consuming a message means that it will not be sent to any |
765 | if it hasn't. Consuming a message means that it will not be sent to any |
480 | parent context. When in doubt, return C<0> from your logging callback. |
766 | slave context. When in doubt, return C<0> from your logging callback. |
481 | |
767 | |
482 | Example: a very simple logging callback, simply dump the message to STDOUT |
768 | Example: a very simple logging callback, simply dump the message to STDOUT |
483 | and do not consume it. |
769 | and do not consume it. |
484 | |
770 | |
485 | $ctx->log_cb (sub { print STDERR shift; 0 }); |
771 | $ctx->log_cb (sub { print STDERR shift; 0 }); |
486 | |
772 | |
|
|
773 | You can filter messages by having a log callback that simply returns C<1> |
|
|
774 | and does not do anything with the message, but this counts as "message |
|
|
775 | being logged" and might not be very efficient. |
|
|
776 | |
|
|
777 | Example: propagate all messages except for log levels "debug" and |
|
|
778 | "trace". The messages will still be generated, though, which can slow down |
|
|
779 | your program. |
|
|
780 | |
|
|
781 | $ctx->levels ("debug", "trace"); |
|
|
782 | $ctx->log_cb (sub { 1 }); # do not log, but eat debug and trace messages |
|
|
783 | |
487 | =item $ctx->fmt_cb ($fmt_cb->($timestamp, $ctx, $level, $message)) |
784 | =item $ctx->fmt_cb ($fmt_cb->($timestamp, $orig_ctx, $level, $message)) |
488 | |
785 | |
489 | Replaces the fornatting callback on the cobntext (C<undef> restores the |
786 | Replaces the formatting callback on the context (C<undef> restores the |
490 | default formatter). |
787 | default formatter). |
491 | |
788 | |
492 | The callback is passed the (possibly fractional) timestamp, the original |
789 | The callback is passed the (possibly fractional) timestamp, the original |
493 | logging context, the (numeric) logging level and the raw message string and needs to |
790 | logging context, the (numeric) logging level and the raw message string |
494 | return a formatted log message. In most cases this will be a string, but |
791 | and needs to return a formatted log message. In most cases this will be a |
495 | it could just as well be an array reference that just stores the values. |
792 | string, but it could just as well be an array reference that just stores |
|
|
793 | the values. |
|
|
794 | |
|
|
795 | If, for some reason, you want to use C<caller> to find out more baout the |
|
|
796 | logger then you should walk up the call stack until you are no longer |
|
|
797 | inside the C<AnyEvent::Log> package. |
496 | |
798 | |
497 | Example: format just the raw message, with numeric log level in angle |
799 | Example: format just the raw message, with numeric log level in angle |
498 | brackets. |
800 | brackets. |
499 | |
801 | |
500 | $ctx->fmt_cb (sub { |
802 | $ctx->fmt_cb (sub { |
… | |
… | |
517 | "$msg->[3]"; |
819 | "$msg->[3]"; |
518 | |
820 | |
519 | 0 |
821 | 0 |
520 | }); |
822 | }); |
521 | |
823 | |
|
|
824 | =item $ctx->log_to_warn |
|
|
825 | |
|
|
826 | Sets the C<log_cb> to simply use C<CORE::warn> to report any messages |
|
|
827 | (usually this logs to STDERR). |
|
|
828 | |
|
|
829 | =item $ctx->log_to_file ($path) |
|
|
830 | |
|
|
831 | Sets the C<log_cb> to log to a file (by appending), unbuffered. |
|
|
832 | |
|
|
833 | =item $ctx->log_to_path ($path) |
|
|
834 | |
|
|
835 | Same as C<< ->log_to_file >>, but opens the file for each message. This |
|
|
836 | is much slower, but allows you to change/move/rename/delete the file at |
|
|
837 | basically any time. |
|
|
838 | |
|
|
839 | Needless(?) to say, if you do not want to be bitten by some evil person |
|
|
840 | calling C<chdir>, the path should be absolute. Doesn't help with |
|
|
841 | C<chroot>, but hey... |
|
|
842 | |
|
|
843 | =item $ctx->log_to_syslog ([$log_flags]) |
|
|
844 | |
|
|
845 | Logs all messages via L<Sys::Syslog>, mapping C<trace> to C<debug> and all |
|
|
846 | the others in the obvious way. If specified, then the C<$log_flags> are |
|
|
847 | simply or'ed onto the priority argument and can contain any C<LOG_xxx> |
|
|
848 | flags valid for Sys::Syslog::syslog, except for the priority levels. |
|
|
849 | |
|
|
850 | Note that this function also sets a C<fmt_cb> - the logging part requires |
|
|
851 | an array reference with [$level, $str] as input. |
|
|
852 | |
522 | =cut |
853 | =cut |
523 | |
854 | |
524 | sub log_cb { |
855 | sub log_cb { |
525 | my ($ctx, $cb) = @_; |
856 | my ($ctx, $cb) = @_; |
526 | |
857 | |
527 | $ctx->[3] = $cb || $default_log_cb; |
858 | $ctx->[3] = $cb; |
528 | } |
859 | } |
529 | |
860 | |
530 | sub fmt_cb { |
861 | sub fmt_cb { |
531 | my ($ctx, $cb) = @_; |
862 | my ($ctx, $cb) = @_; |
532 | |
863 | |
533 | $ctx->[4] = $cb; |
864 | $ctx->[4] = $cb; |
534 | } |
865 | } |
535 | |
866 | |
|
|
867 | sub log_to_warn { |
|
|
868 | my ($ctx, $path) = @_; |
|
|
869 | |
|
|
870 | $ctx->log_cb (sub { |
|
|
871 | warn shift; |
|
|
872 | 0 |
|
|
873 | }); |
|
|
874 | } |
|
|
875 | |
|
|
876 | sub log_to_file { |
|
|
877 | my ($ctx, $path) = @_; |
|
|
878 | |
|
|
879 | open my $fh, ">>", $path |
|
|
880 | or die "$path: $!"; |
|
|
881 | |
|
|
882 | $ctx->log_cb (sub { |
|
|
883 | syswrite $fh, shift; |
|
|
884 | 0 |
|
|
885 | }); |
|
|
886 | } |
|
|
887 | |
|
|
888 | sub log_to_path { |
|
|
889 | my ($ctx, $path) = @_; |
|
|
890 | |
|
|
891 | $ctx->log_cb (sub { |
|
|
892 | open my $fh, ">>", $path |
|
|
893 | or die "$path: $!"; |
|
|
894 | |
|
|
895 | syswrite $fh, shift; |
|
|
896 | 0 |
|
|
897 | }); |
|
|
898 | } |
|
|
899 | |
|
|
900 | sub log_to_syslog { |
|
|
901 | my ($ctx, $flags) = @_; |
|
|
902 | |
|
|
903 | require Sys::Syslog; |
|
|
904 | |
|
|
905 | $ctx->fmt_cb (sub { |
|
|
906 | my $str = $_[3]; |
|
|
907 | $str =~ s/\n(?=.)/\n+ /g; |
|
|
908 | |
|
|
909 | [$_[2], "($_[1][0]) $str"] |
|
|
910 | }); |
|
|
911 | |
|
|
912 | $ctx->log_cb (sub { |
|
|
913 | my $lvl = $_[0][0] < 9 ? $_[0][0] : 8; |
|
|
914 | |
|
|
915 | Sys::Syslog::syslog ($flags | ($lvl - 1), $_) |
|
|
916 | for split /\n/, $_[0][1]; |
|
|
917 | |
|
|
918 | 0 |
|
|
919 | }); |
|
|
920 | } |
|
|
921 | |
|
|
922 | =back |
|
|
923 | |
|
|
924 | =head3 MESSAGE LOGGING |
|
|
925 | |
|
|
926 | These methods allow you to log messages directly to a context, without |
|
|
927 | going via your package context. |
|
|
928 | |
|
|
929 | =over 4 |
|
|
930 | |
536 | =item $ctx->log ($level, $msg[, @params]) |
931 | =item $ctx->log ($level, $msg[, @params]) |
537 | |
932 | |
538 | Same as C<AnyEvent::Log::log>, but uses the given context as log context. |
933 | Same as C<AnyEvent::Log::log>, but uses the given context as log context. |
539 | |
934 | |
540 | =item $logger = $ctx->logger ($level[, \$enabled]) |
935 | =item $logger = $ctx->logger ($level[, \$enabled]) |
… | |
… | |
545 | =cut |
940 | =cut |
546 | |
941 | |
547 | *log = \&AnyEvent::Log::_log; |
942 | *log = \&AnyEvent::Log::_log; |
548 | *logger = \&AnyEvent::Log::_logger; |
943 | *logger = \&AnyEvent::Log::_logger; |
549 | |
944 | |
|
|
945 | =back |
|
|
946 | |
|
|
947 | =cut |
|
|
948 | |
|
|
949 | package AnyEvent::Log; |
|
|
950 | |
|
|
951 | =head1 CONFIGURATION VIA $ENV{PERL_ANYEVENT_LOG} |
|
|
952 | |
|
|
953 | Logging can also be configured by setting the environment variable |
|
|
954 | C<PERL_ANYEVENT_LOG> (or C<AE_LOG>). |
|
|
955 | |
|
|
956 | The value consists of one or more logging context specifications separated |
|
|
957 | by C<:> or whitespace. Each logging specification in turn starts with a |
|
|
958 | context name, followed by C<=>, followed by zero or more comma-separated |
|
|
959 | configuration directives, here are some examples: |
|
|
960 | |
|
|
961 | # set default logging level |
|
|
962 | filter=warn |
|
|
963 | |
|
|
964 | # log to file instead of to stderr |
|
|
965 | log=file=/tmp/mylog |
|
|
966 | |
|
|
967 | # log to file in addition to stderr |
|
|
968 | log=+%file:%file=file=/tmp/mylog |
|
|
969 | |
|
|
970 | # enable debug log messages, log warnings and above to syslog |
|
|
971 | filter=debug:log=+%warnings:%warnings=warn,syslog=LOG_LOCAL0 |
|
|
972 | |
|
|
973 | # log trace messages (only) from AnyEvent::Debug to file |
|
|
974 | AnyEvent::Debug=+%trace:%trace=only,trace,file=/tmp/tracelog |
|
|
975 | |
|
|
976 | A context name in the log specification can be any of the following: |
|
|
977 | |
|
|
978 | =over 4 |
|
|
979 | |
|
|
980 | =item C<collect>, C<filter>, C<log> |
|
|
981 | |
|
|
982 | Correspond to the three predefined C<$AnyEvent::Log::COLLECT>, |
|
|
983 | C<AnyEvent::Log::FILTER> and C<$AnyEvent::Log::LOG> contexts. |
|
|
984 | |
|
|
985 | =item C<%name> |
|
|
986 | |
|
|
987 | Context names starting with a C<%> are anonymous contexts created when the |
|
|
988 | name is first mentioned. The difference to package contexts is that by |
|
|
989 | default they have no attached slaves. |
|
|
990 | |
|
|
991 | =item a perl package name |
|
|
992 | |
|
|
993 | Any other string references the logging context associated with the given |
|
|
994 | Perl C<package>. In the unlikely case where you want to specify a package |
|
|
995 | context that matches on of the other context name forms, you can add a |
|
|
996 | C<::> to the package name to force interpretation as a package. |
|
|
997 | |
|
|
998 | =back |
|
|
999 | |
|
|
1000 | The configuration specifications can be any number of the following: |
|
|
1001 | |
|
|
1002 | =over 4 |
|
|
1003 | |
|
|
1004 | =item C<stderr> |
|
|
1005 | |
|
|
1006 | Configures the context to use Perl's C<warn> function (which typically |
|
|
1007 | logs to C<STDERR>). Works like C<log_to_warn>. |
|
|
1008 | |
|
|
1009 | =item C<file=>I<path> |
|
|
1010 | |
|
|
1011 | Configures the context to log to a file with the given path. Works like |
|
|
1012 | C<log_to_file>. |
|
|
1013 | |
|
|
1014 | =item C<path=>I<path> |
|
|
1015 | |
|
|
1016 | Configures the context to log to a file with the given path. Works like |
|
|
1017 | C<log_to_path>. |
|
|
1018 | |
|
|
1019 | =item C<syslog> or C<syslog=>I<expr> |
|
|
1020 | |
|
|
1021 | Configures the context to log to syslog. If I<expr> is given, then it is |
|
|
1022 | evaluated in the L<Sys::Syslog> package, so you could use: |
|
|
1023 | |
|
|
1024 | log=syslog=LOG_LOCAL0 |
|
|
1025 | |
|
|
1026 | =item C<nolog> |
|
|
1027 | |
|
|
1028 | Configures the context to not log anything by itself, which is the |
|
|
1029 | default. Same as C<< $ctx->log_cb (undef) >>. |
|
|
1030 | |
|
|
1031 | =item C<0> or C<off> |
|
|
1032 | |
|
|
1033 | Sets the logging level of the context ot C<0>, i.e. all messages will be |
|
|
1034 | filtered out. |
|
|
1035 | |
|
|
1036 | =item C<all> |
|
|
1037 | |
|
|
1038 | Enables all logging levels, i.e. filtering will effectively be switched |
|
|
1039 | off (the default). |
|
|
1040 | |
|
|
1041 | =item C<only> |
|
|
1042 | |
|
|
1043 | Disables all logging levels, and changes the interpretation of following |
|
|
1044 | level specifications to enable the specified level only. |
|
|
1045 | |
|
|
1046 | Example: only enable debug messages for a context. |
|
|
1047 | |
|
|
1048 | context=only,debug |
|
|
1049 | |
|
|
1050 | =item C<except> |
|
|
1051 | |
|
|
1052 | Enables all logging levels, and changes the interpretation of following |
|
|
1053 | level specifications to disable that level. Rarely used. |
|
|
1054 | |
|
|
1055 | Example: enable all logging levels except fatal and trace (this is rather |
|
|
1056 | nonsensical). |
|
|
1057 | |
|
|
1058 | filter=exept,fatal,trace |
|
|
1059 | |
|
|
1060 | =item C<level> |
|
|
1061 | |
|
|
1062 | Enables all logging levels, and changes the interpretation of following |
|
|
1063 | level specifications to be "that level or any higher priority |
|
|
1064 | message". This is the default. |
|
|
1065 | |
|
|
1066 | Example: log anything at or above warn level. |
|
|
1067 | |
|
|
1068 | filter=warn |
|
|
1069 | |
|
|
1070 | # or, more verbose |
|
|
1071 | filter=only,level,warn |
|
|
1072 | |
|
|
1073 | =item C<1>..C<9> or a logging level name (C<error>, C<debug> etc.) |
|
|
1074 | |
|
|
1075 | A numeric loglevel or the name of a loglevel will be interpreted according |
|
|
1076 | to the most recent C<only>, C<except> or C<level> directive. By default, |
|
|
1077 | specifying a logging level enables that and any higher priority messages. |
|
|
1078 | |
|
|
1079 | =item C<+>I<context> |
|
|
1080 | |
|
|
1081 | Attaches the named context as slave to the context. |
|
|
1082 | |
|
|
1083 | =item C<+> |
|
|
1084 | |
|
|
1085 | A line C<+> detaches all contexts, i.e. clears the slave list from the |
|
|
1086 | context. Anonymous (C<%name>) contexts have no attached slaves by default, |
|
|
1087 | but package contexts have the parent context as slave by default. |
|
|
1088 | |
|
|
1089 | Example: log messages from My::Module to a file, do not send them to the |
|
|
1090 | default log collector. |
|
|
1091 | |
|
|
1092 | My::Module=+,file=/tmp/mymodulelog |
|
|
1093 | |
|
|
1094 | =back |
|
|
1095 | |
|
|
1096 | Any character can be escaped by prefixing it with a C<\> (backslash), as |
|
|
1097 | usual, so to log to a file containing a comma, colon, backslash and some |
|
|
1098 | spaces in the filename, you would do this: |
|
|
1099 | |
|
|
1100 | PERL_ANYEVENT_LOG='log=file=/some\ \:file\ with\,\ \\-escapes' |
|
|
1101 | |
|
|
1102 | Since whitespace (which includes newlines) is allowed, it is fine to |
|
|
1103 | specify multiple lines in C<PERL_ANYEVENT_LOG>, e.g.: |
|
|
1104 | |
|
|
1105 | PERL_ANYEVENT_LOG=" |
|
|
1106 | filter=warn |
|
|
1107 | AnyEvent::Debug=+%trace |
|
|
1108 | %trace=only,trace,+log |
|
|
1109 | " myprog |
|
|
1110 | |
|
|
1111 | Also, in the unlikely case when you want to concatenate specifications, |
|
|
1112 | use whitespace as separator, as C<::> will be interpreted as part of a |
|
|
1113 | module name, an empty spec with two separators: |
|
|
1114 | |
|
|
1115 | PERL_ANYEVENT_LOG="$PERL_ANYEVENT_LOG MyMod=debug" |
|
|
1116 | |
|
|
1117 | =cut |
|
|
1118 | |
|
|
1119 | for (my $spec = $ENV{PERL_ANYEVENT_LOG}) { |
|
|
1120 | my %anon; |
|
|
1121 | |
|
|
1122 | my $pkg = sub { |
|
|
1123 | $_[0] eq "log" ? $LOG |
|
|
1124 | : $_[0] eq "filter" ? $FILTER |
|
|
1125 | : $_[0] eq "collect" ? $COLLECT |
|
|
1126 | : $_[0] =~ /^%(.+)$/ ? ($anon{$1} ||= ctx undef) |
|
|
1127 | : $_[0] =~ /^(.*?)(?:::)?$/ ? ctx "$1" # egad :/ |
|
|
1128 | : die # never reached? |
|
|
1129 | }; |
|
|
1130 | |
|
|
1131 | /\G[[:space:]]+/gc; # skip initial whitespace |
|
|
1132 | |
|
|
1133 | while (/\G((?:[^:=[:space:]]+|::|\\.)+)=/gc) { |
|
|
1134 | my $ctx = $pkg->($1); |
|
|
1135 | my $level = "level"; |
|
|
1136 | |
|
|
1137 | while (/\G((?:[^,:[:space:]]+|::|\\.)+)/gc) { |
|
|
1138 | for ("$1") { |
|
|
1139 | if ($_ eq "stderr" ) { $ctx->log_to_warn; |
|
|
1140 | } elsif (/^file=(.+)/ ) { $ctx->log_to_file ("$1"); |
|
|
1141 | } elsif (/^path=(.+)/ ) { $ctx->log_to_path ("$1"); |
|
|
1142 | } elsif (/syslog(?:=(.*))?/ ) { require Sys::Syslog; $ctx->log_to_syslog (eval "package Sys::Syslog; $1"); |
|
|
1143 | } elsif ($_ eq "nolog" ) { $ctx->log_cb (undef); |
|
|
1144 | } elsif (/^\+(.+)$/ ) { $ctx->attach ($pkg->("$1")); |
|
|
1145 | } elsif ($_ eq "+" ) { $ctx->slaves; |
|
|
1146 | } elsif ($_ eq "off" or $_ eq "0") { $ctx->level (0); |
|
|
1147 | } elsif ($_ eq "all" ) { $ctx->level ("all"); |
|
|
1148 | } elsif ($_ eq "level" ) { $ctx->level ("all"); $level = "level"; |
|
|
1149 | } elsif ($_ eq "only" ) { $ctx->level ("off"); $level = "enable"; |
|
|
1150 | } elsif ($_ eq "except" ) { $ctx->level ("all"); $level = "disable"; |
|
|
1151 | } elsif (/^\d$/ ) { $ctx->$level ($_); |
|
|
1152 | } elsif (exists $STR2LEVEL{$_} ) { $ctx->$level ($_); |
|
|
1153 | } else { die "PERL_ANYEVENT_LOG ($spec): parse error at '$_'\n"; |
|
|
1154 | } |
|
|
1155 | } |
|
|
1156 | |
|
|
1157 | /\G,/gc or last; |
|
|
1158 | } |
|
|
1159 | |
|
|
1160 | /\G[:[:space:]]+/gc or last; |
|
|
1161 | } |
|
|
1162 | |
|
|
1163 | /\G[[:space:]]+/gc; # skip trailing whitespace |
|
|
1164 | |
|
|
1165 | if (/\G(.+)/g) { |
|
|
1166 | die "PERL_ANYEVENT_LOG ($spec): parse error at '$1'\n"; |
|
|
1167 | } |
|
|
1168 | } |
|
|
1169 | |
550 | 1; |
1170 | 1; |
|
|
1171 | |
|
|
1172 | =head1 EXAMPLES |
|
|
1173 | |
|
|
1174 | This section shows some common configurations, both as code, and as |
|
|
1175 | C<PERL_ANYEVENT_LOG> string. |
|
|
1176 | |
|
|
1177 | =over 4 |
|
|
1178 | |
|
|
1179 | =item Setting the global logging level. |
|
|
1180 | |
|
|
1181 | Either put C<PERL_ANYEVENT_VERBOSE=><number> into your environment before |
|
|
1182 | running your program, use C<PERL_ANYEVENT_LOG> or modify the log level of |
|
|
1183 | the root context at runtime: |
|
|
1184 | |
|
|
1185 | PERL_ANYEVENT_VERBOSE=5 ./myprog |
|
|
1186 | |
|
|
1187 | PERL_ANYEVENT_LOG=log=warn |
|
|
1188 | |
|
|
1189 | $AnyEvent::Log::FILTER->level ("warn"); |
|
|
1190 | |
|
|
1191 | =item Append all messages to a file instead of sending them to STDERR. |
|
|
1192 | |
|
|
1193 | This is affected by the global logging level. |
|
|
1194 | |
|
|
1195 | $AnyEvent::Log::LOG->log_to_file ($path); |
|
|
1196 | |
|
|
1197 | PERL_ANYEVENT_LOG=log=file=/some/path |
|
|
1198 | |
|
|
1199 | =item Write all messages with priority C<error> and higher to a file. |
|
|
1200 | |
|
|
1201 | This writes them only when the global logging level allows it, because |
|
|
1202 | it is attached to the default context which is invoked I<after> global |
|
|
1203 | filtering. |
|
|
1204 | |
|
|
1205 | $AnyEvent::Log::FILTER->attach |
|
|
1206 | new AnyEvent::Log::Ctx log_to_file => $path); |
|
|
1207 | |
|
|
1208 | PERL_ANYEVENT_LOG=filter=+%filelogger:%filelogger=file=/some/path |
|
|
1209 | |
|
|
1210 | This writes them regardless of the global logging level, because it is |
|
|
1211 | attached to the toplevel context, which receives all messages I<before> |
|
|
1212 | the global filtering. |
|
|
1213 | |
|
|
1214 | $AnyEvent::Log::COLLECT->attach ( |
|
|
1215 | new AnyEvent::Log::Ctx log_to_file => $path); |
|
|
1216 | |
|
|
1217 | PERL_ANYEVENT_LOG=%filelogger=file=/some/path:collect=+%filelogger |
|
|
1218 | |
|
|
1219 | In both cases, messages are still written to STDERR. |
|
|
1220 | |
|
|
1221 | =item Write trace messages (only) from L<AnyEvent::Debug> to the default logging target(s). |
|
|
1222 | |
|
|
1223 | Attach the C<$AnyEvent::Log::LOG> context to the C<AnyEvent::Debug> |
|
|
1224 | context - this simply circumvents the global filtering for trace messages. |
|
|
1225 | |
|
|
1226 | my $debug = AnyEvent::Debug->AnyEvent::Log::ctx; |
|
|
1227 | $debug->attach ($AnyEvent::Log::LOG); |
|
|
1228 | |
|
|
1229 | PERL_ANYEVENT_LOG=AnyEvent::Debug=+log |
|
|
1230 | |
|
|
1231 | This of course works for any package, not just L<AnyEvent::Debug>, but |
|
|
1232 | assumes the log level for AnyEvent::Debug hasn't been changed from the |
|
|
1233 | default. |
551 | |
1234 | |
552 | =back |
1235 | =back |
553 | |
1236 | |
554 | =head1 AUTHOR |
1237 | =head1 AUTHOR |
555 | |
1238 | |
556 | Marc Lehmann <schmorp@schmorp.de> |
1239 | Marc Lehmann <schmorp@schmorp.de> |
557 | http://home.schmorp.de/ |
1240 | http://home.schmorp.de/ |
558 | |
1241 | |
559 | =cut |
1242 | =cut |
|
|
1243 | |