[ViewVC] Diff of: cvs/AnyEvent/lib/AnyEvent/Log.pm

Comparing AnyEvent/lib/AnyEvent/Log.pm (file contents):
Revision 1.3 by root, Wed Aug 17 02:02:38 2011 UTC vs.
Revision 1.42 by root, Thu Sep 1 22:38:11 2011 UTC

…		…
2		2
3	AnyEvent::Log - simple logging "framework"	3	AnyEvent::Log - simple logging "framework"
4		4
5	=head1 SYNOPSIS	5	=head1 SYNOPSIS
6		6
		7	Simple uses:
		8
		9	use AnyEvent;
		10
		11	AE::log debug => "hit my knee";
		12	AE::log warn => "it's a bit too hot";
		13	AE::log error => "the flag was false!";
		14	AE::log fatal => "the bit toggled! run!"; # never returns
		15
		16	# available log levels in order:
		17	# fatal alert critical error warn note info debug trace
		18
		19	"Complex" uses (for speed sensitive code):
		20
7	use AnyEvent::Log;	21	use AnyEvent::Log;
		22
		23	my $tracer = AnyEvent::Log::logger trace => \$my $trace;
		24
		25	$tracer->("i am here") if $trace;
		26	$tracer->(sub { "lots of data: " . Dumper $self }) if $trace;
		27
		28	Configuration (also look at the EXAMPLES section):
		29
		30	# set logging for the current package to errors and higher only
		31	AnyEvent::Log::ctx->level ("error");
		32
		33	# set logging level to suppress anything below "notice"
		34	$AnyEvent::Log::FILTER->level ("notice");
		35
		36	# send all critical and higher priority messages to syslog,
		37	# regardless of (most) other settings
		38	$AnyEvent::Log::COLLECT->attach (new AnyEvent::Log::Ctx
		39	level => "critical",
		40	log_to_syslog => "user",
		41	);
8		42
9	=head1 DESCRIPTION	43	=head1 DESCRIPTION
10		44
11	This module implements a relatively simple "logging framework". It doesn't	45	This module implements a relatively simple "logging framework". It doesn't
12	attempt to be "the" logging solution or even "a" logging solution for	46	attempt to be "the" logging solution or even "a" logging solution for
13	AnyEvent - AnyEvent simply creates logging messages internally, and this	47	AnyEvent - AnyEvent simply creates logging messages internally, and this
14	module more or less exposes the mechanism, with some extra spiff to allow	48	module more or less exposes the mechanism, with some extra spiff to allow
15	using it from other modules as well.	49	using it from other modules as well.
16		50
17	Remember that the default verbosity level is C<0>, so nothing	51	Remember that the default verbosity level is C<0> (C<off>), so nothing
18	will be logged, ever, unless you set C<$Anyvent::VERBOSE> or	52	will be logged, unless you set C<PERL_ANYEVENT_VERBOSE> to a higher number
19	C<PERL_ANYEVENT_VERBOSE> to a higher number.	53	before starting your program, or change the logging level at runtime with
		54	something like:
20		55
21	Possible future extensions are to allow custom log targets (where the	56	use AnyEvent::Log;
22	level is an object), log filtering based on package, formatting, aliasing	57	$AnyEvent::Log::FILTER->level ("info");
23	or package groups.
24		58
		59	The design goal behind this module was to keep it simple (and small),
		60	but make it powerful enough to be potentially useful for any module, and
		61	extensive enough for the most common tasks, such as logging to multiple
		62	targets, or being able to log into a database.
		63
		64	The module is also usable before AnyEvent itself is initialised, in which
		65	case some of the functionality might be reduced.
		66
		67	The amount of documentation might indicate otherwise, but the runtime part
		68	of the module is still just below 300 lines of code.
		69
		70	=head1 LOGGING LEVELS
		71
		72	Logging levels in this module range from C<1> (highest priority) to C<9>
		73	(lowest priority). Note that the lowest numerical value is the highest
		74	priority, so when this document says "higher priority" it means "lower
		75	numerical value".
		76
		77	Instead of specifying levels by name you can also specify them by aliases:
		78
		79	LVL NAME SYSLOG PERL NOTE
		80	1 fatal emerg exit system unusable, aborts program!
		81	2 alert failure in primary system
		82	3 critical crit failure in backup system
		83	4 error err die non-urgent program errors, a bug
		84	5 warn warning possible problem, not necessarily error
		85	6 note notice unusual conditions
		86	7 info normal messages, no action required
		87	8 debug debugging messages for development
		88	9 trace copious tracing output
		89
		90	As you can see, some logging levels have multiple aliases - the first one
		91	is the "official" name, the second one the "syslog" name (if it differs)
		92	and the third one the "perl" name, suggesting (only!) that you log C<die>
		93	messages at C<error> priority. The NOTE column tries to provide some
		94	rationale on how to chose a logging level.
		95
		96	As a rough guideline, levels 1..3 are primarily meant for users of
		97	the program (admins, staff), and are the only logged to STDERR by
		98	default. Levels 4..6 are meant for users and developers alike, while
		99	levels 7..9 are usually meant for developers.
		100
		101	You can normally only log a single message at highest priority level
		102	(C<1>, C<fatal>), because logging a fatal message will also quit the
		103	program - so use it sparingly :)
		104
		105	Some methods also offer some extra levels, such as C<0>, C<off>, C<none>
		106	or C<all> - these are only valid in the methods they are documented for.
		107
25	=head1 LOG FUNCTIONS	108	=head1 LOGGING FUNCTIONS
26		109
27	These functions allow you to log messages. They always use the caller's	110	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	111	package as a "logging context". Also, the main logging function C<log> is
29	easily available as C<AnyEvent::log> or C<AE::log> when the C<AnyEvent>	112	callable as C<AnyEvent::log> or C<AE::log> when the C<AnyEvent> module is
30	module is loaded.	113	loaded.
31		114
32	=over 4	115	=over 4
33		116
34	=cut	117	=cut
35		118
…		…
37		120
38	use Carp ();	121	use Carp ();
39	use POSIX ();	122	use POSIX ();
40		123
41	use AnyEvent (); BEGIN { AnyEvent::common_sense }	124	use AnyEvent (); BEGIN { AnyEvent::common_sense }
42	use AnyEvent::Util ();	125	#use AnyEvent::Util (); need to load this in a delayed fashion, as it uses AE::log
		126
		127	our $VERSION = $AnyEvent::VERSION;
		128
		129	our ($COLLECT, $FILTER, $LOG);
43		130
44	our ($now_int, $now_str1, $now_str2);	131	our ($now_int, $now_str1, $now_str2);
45		132
46	# Format Time, not public - yet?	133	# Format Time, not public - yet?
47	sub ft($) {	134	sub ft($) {
…		…
52	if $now_int != $i;	139	if $now_int != $i;
53		140
54	"$now_str1$f$now_str2"	141	"$now_str1$f$now_str2"
55	}	142	}
56		143
57	our %CFG; #TODO	144	our %CTX; # all package contexts
		145
		146	# creates a default package context object for the given package
		147	sub _pkg_ctx($) {
		148	my $ctx = bless [$_[0], (1 << 10) - 1 - 1, {}], "AnyEvent::Log::Ctx";
		149
		150	# link "parent" package
		151	my $parent = $_[0] =~ /^(.+)::/
		152	? $CTX{$1} \|\|= &_pkg_ctx ("$1")
		153	: $COLLECT;
		154
		155	$ctx->[2]{$parent+0} = $parent;
		156
		157	$ctx
		158	}
58		159
59	=item AnyEvent::Log::log $level, $msg[, @args]	160	=item AnyEvent::Log::log $level, $msg[, @args]
60		161
61	Requests logging of the given C<$msg> with the given log level (1..9).	162	Requests logging of the given C<$msg> with the given log level, and
62	You can also use the following strings as log level: C<fatal> (1),	163	returns true if the message was logged I<somewhere>.
63	C<alert> (2), C<critical> (3), C<error> (4), C<warn> (5), C<note> (6),
64	C<info> (7), C<debug> (8), C<trace> (9).
65		164
66	For C<fatal> log levels, the program will abort.	165	For loglevel C<fatal>, the program will abort.
67		166
68	If only a C<$msg> is given, it is logged as-is. With extra C<@args>, the	167	If only a C<$msg> is given, it is logged as-is. With extra C<@args>, the
69	C<$msg> is interpreted as an sprintf format string.	168	C<$msg> is interpreted as an sprintf format string.
70		169
71	The C<$msg> should not end with C<\n>, but may if that is convenient for	170	The C<$msg> should not end with C<\n>, but may if that is convenient for
…		…
75	supposed to return the message. It will be called only then the message	174	supposed to return the message. It will be called only then the message
76	actually gets logged, which is useful if it is costly to create the	175	actually gets logged, which is useful if it is costly to create the
77	message in the first place.	176	message in the first place.
78		177
79	Whether the given message will be logged depends on the maximum log level	178	Whether the given message will be logged depends on the maximum log level
80	and the caller's package.	179	and the caller's package. The return value can be used to ensure that
		180	messages or not "lost" - for example, when L<AnyEvent::Debug> detects a
		181	runtime error it tries to log it at C<die> level, but if that message is
		182	lost it simply uses warn.
81		183
82	Note that you can (and should) call this function as C<AnyEvent::log> or	184	Note that you can (and should) call this function as C<AnyEvent::log> or
83	C<AE::log>, without C<use>-ing this module if possible, as those functions	185	C<AE::log>, without C<use>-ing this module if possible (i.e. you don't
84	will laod the logging module on demand only.	186	need any additional functionality), as those functions will load the
		187	logging module on demand only. They are also much shorter to write.
		188
		189	Also, if you optionally generate a lot of debug messages (such as when
		190	tracing some code), you should look into using a logger callback and a
		191	boolean enabler (see C<logger>, below).
85		192
86	Example: log something at error level.	193	Example: log something at error level.
87		194
88	AE::log error => "something";	195	AE::log error => "something";
89		196
…		…
97		204
98	=cut	205	=cut
99		206
100	# also allow syslog equivalent names	207	# also allow syslog equivalent names
101	our %STR2LEVEL = (	208	our %STR2LEVEL = (
102	fatal => 1, emerg => 1,	209	fatal => 1, emerg => 1, exit => 1,
103	alert => 2,	210	alert => 2,
104	critical => 3, crit => 3,	211	critical => 3, crit => 3,
105	error => 4, err => 4,	212	error => 4, err => 4, die => 4,
106	warn => 5, warning => 5,	213	warn => 5, warning => 5,
107	note => 6, notice => 6,	214	note => 6, notice => 6,
108	info => 7,	215	info => 7,
109	debug => 8,	216	debug => 8,
110	trace => 9,	217	trace => 9,
111	);	218	);
112		219
		220	our $TIME_EXACT;
		221
		222	sub exact_time($) {
		223	$TIME_EXACT = shift;
		224	*_ts = $AnyEvent::MODEL
		225	? $TIME_EXACT ? \&AE::now : \&AE::time
		226	: sub () { $TIME_EXACT ? do { require Time::HiRes; Time::HiRes::time () } : time };
		227	}
		228
		229	BEGIN {
		230	exact_time 0;
		231	}
		232
		233	AnyEvent::post_detect {
		234	exact_time $TIME_EXACT;
		235	};
		236
113	our @LEVEL2STR = qw(0 fatal alert crit error warn note info debug trace);	237	our @LEVEL2STR = qw(0 fatal alert crit error warn note info debug trace);
114		238
		239	# time, ctx, level, msg
		240	sub _format($$$$) {
		241	my $ts = ft $_[0];
		242	my $ct = " ";
		243
		244	my @res;
		245
		246	for (split /\n/, sprintf "%-5s %s: %s", $LEVEL2STR[$_[2]], $_[1][0], $_[3]) {
		247	push @res, "$ts$ct$_\n";
		248	$ct = " + ";
		249	}
		250
		251	join "", @res
		252	}
		253
115	sub _log {	254	sub _log {
116	my ($pkg, $targ, $msg, @args) = @_;	255	my ($ctx, $level, $format, @args) = @_;
117		256
118	my $level = ref $targ ? die "Can't use reference as logging level (yet)"	257	$level = $level > 0 && $level <= 9
119	: $targ > 0 && $targ <= 9 ? $targ+0	258	? $level+0
120	: $STR2LEVEL{$targ} \|\| Carp::croak "$targ: not a valid logging level, caught";	259	: $STR2LEVEL{$level} \|\| Carp::croak "$level: not a valid logging level, caught";
121		260
122	return if $level > $AnyEvent::VERBOSE;	261	my $mask = 1 << $level;
123		262
124	$msg = $msg->() if ref $msg;	263	my ($success, %seen, @ctx, $now, $fmt);
125	$msg = sprintf $msg, @args if @args;
126	$msg =~ s/\n$//;
127		264
128	# now we have a message, log it	265	do
129	#TODO: could do LOTS of stuff here, and should, at least in some later version	266	{
		267	# skip if masked
		268	if ($ctx->[1] & $mask && !$seen{$ctx+0}++) {
		269	if ($ctx->[3]) {
		270	# logging target found
130		271
131	$msg = sprintf "%5s %s: %s", $LEVEL2STR[$level], $pkg, $msg;	272	# now get raw message, unless we have it already
132	my $pfx = ft AE::now;	273	unless ($now) {
		274	$format = $format->() if ref $format;
		275	$format = sprintf $format, @args if @args;
		276	$format =~ s/\n$//;
		277	$now = _ts;
		278	};
133		279
134	for (split /\n/, $msg) {	280	# format msg
135	printf STDERR "$pfx $_\n";	281	my $str = $ctx->[4]
136	$pfx = "\t";	282	? $ctx->[4]($now, $_[0], $level, $format)
137	}	283	: ($fmt \|\|= _format $now, $_[0], $level, $format);
		284
		285	$success = 1;
		286
		287	$ctx->[3]($str)
		288	or push @ctx, values %{ $ctx->[2] }; # not consumed - propagate
		289	} else {
		290	push @ctx, values %{ $ctx->[2] }; # not masked - propagate
		291	}
		292	}
		293	}
		294	while $ctx = pop @ctx;
138		295
139	exit 1 if $level <= 1;	296	exit 1 if $level <= 1;
		297
		298	$success
140	}	299	}
141		300
142	sub log($$;@) {	301	sub log($$;@) {
143	_log +(caller)[0], @_;	302	_log
		303	$CTX{ (caller)[0] } \|\|= _pkg_ctx +(caller)[0],
		304	@_;
144	}	305	}
145		306
146	AnyEvent::log = AE::log = \&log;	307	AnyEvent::log = AE::log = \&log;
147		308
148	=item $logger = AnyEvent::Log::logger $level[, \$enabled]	309	=item $logger = AnyEvent::Log::logger $level[, \$enabled]
149		310
150	Creates a code reference that, when called, acts as if the	311	Creates a code reference that, when called, acts as if the
151	C<AnyEvent::Log::log> function was called at this point with the givne	312	C<AnyEvent::Log::log> function was called at this point with the given
152	level. C<$logger> is passed a C<$msg> and optional C<@args>, just as with	313	level. C<$logger> is passed a C<$msg> and optional C<@args>, just as with
153	the C<AnyEvent::Log::log> function:	314	the C<AnyEvent::Log::log> function:
154		315
155	my $debug_log = AnyEvent::Log::logger "debug";	316	my $debug_log = AnyEvent::Log::logger "debug";
156		317
…		…
181	# and later in your program	342	# and later in your program
182	$debug_log->("yo, stuff here") if $debug;	343	$debug_log->("yo, stuff here") if $debug;
183		344
184	$debug and $debug_log->("123");	345	$debug and $debug_log->("123");
185		346
186	Note: currently the enabled var is always true - that will be fixed in a
187	future version :)
188
189	=cut	347	=cut
190		348
191	our %LOGGER;	349	our %LOGGER;
192		350
193	# re-assess logging status for all loggers	351	# re-assess logging status for all loggers
194	sub _reassess {	352	sub _reassess {
		353	local $SIG{__DIE__};
		354	my $die = sub { die };
		355
195	for (@_ ? $LOGGER{$_[0]} : values %LOGGER) {	356	for (@_ ? $LOGGER{$_[0]} : values %LOGGER) {
196	my ($pkg, $level, $renabled) = @$_;	357	my ($ctx, $level, $renabled) = @$_;
197		358
198	# to detetc whether a message would be logged, we # actually	359	# to detect whether a message would be logged, we actually
199	# try to log one and die. this isn't # fast, but we can be	360	# try to log one and die. this isn't fast, but we can be
200	# sure that the logging decision is correct :)	361	# sure that the logging decision is correct :)
201		362
202	$$renabled = !eval {	363	$$renabled = !eval {
203	local $SIG{__DIE__};
204
205	_log $pkg, $level, sub { die };	364	_log $ctx, $level, $die;
206		365
207	1	366	1
208	};	367	};
209
210	$$renabled = 1; # TODO
211	}	368	}
212	}	369	}
213		370
214	sub logger($;$) {	371	sub _logger {
215	my ($level, $renabled) = @_;	372	my ($ctx, $level, $renabled) = @_;
216
217	$renabled \|\|= \my $enabled;
218	my $pkg = (caller)[0];
219		373
220	$$renabled = 1;	374	$$renabled = 1;
221		375
222	my $logger = [$pkg, $level, $renabled];	376	my $logger = [$ctx, $level, $renabled];
223		377
224	$LOGGER{$logger+0} = $logger;	378	$LOGGER{$logger+0} = $logger;
225		379
226	_reassess $logger+0;	380	_reassess $logger+0;
227		381
		382	require AnyEvent::Util;
228	my $guard = AnyEvent::Util::guard {	383	my $guard = AnyEvent::Util::guard (sub {
229	# "clean up"	384	# "clean up"
230	delete $LOGGER{$logger+0};	385	delete $LOGGER{$logger+0};
231	};	386	});
232		387
233	sub {	388	sub {
234	$guard if 0; # keep guard alive, but don't cause runtime overhead	389	$guard if 0; # keep guard alive, but don't cause runtime overhead
235		390
236	_log $pkg, $level, @_	391	_log $ctx, $level, @_
237	if $$renabled;	392	if $$renabled;
238	}	393	}
239	}	394	}
240		395
241	#TODO	396	sub logger($;$) {
		397	_logger
		398	$CTX{ (caller)[0] } \|\|= _pkg_ctx +(caller)[0],
		399	@_
		400	}
		401
		402	=item AnyEvent::Log::exact_time $on
		403
		404	By default, C<AnyEvent::Log> will use C<AE::now>, i.e. the cached
		405	eventloop time, for the log timestamps. After calling this function with a
		406	true value it will instead resort to C<AE::time>, i.e. fetch the current
		407	time on each log message. This only makes a difference for event loops
		408	that actually cache the time (such as L<EV> or L<AnyEvent::Loop>).
		409
		410	This setting can be changed at any time by calling this function.
		411
		412	Since C<AnyEvent::Log> has to work even before the L<AnyEvent> has been
		413	initialised, this switch will also decide whether to use C<CORE::time> or
		414	C<Time::HiRes::time> when logging a message before L<AnyEvent> becomes
		415	available.
242		416
243	=back	417	=back
244		418
245	=head1 CONFIGURATION FUNCTIONALITY	419	=head1 LOGGING CONTEXTS
246		420
247	None, yet, except for C<PERL_ANYEVENT_VERBOSE>, described in the L<AnyEvent> manpage.	421	This module associates every log message with a so-called I<logging
		422	context>, based on the package of the caller. Every perl package has its
		423	own logging context.
		424
		425	A logging context has three major responsibilities: filtering, logging and
		426	propagating the message.
		427
		428	For the first purpose, filtering, each context has a set of logging
		429	levels, called the log level mask. Messages not in the set will be ignored
		430	by this context (masked).
		431
		432	For logging, the context stores a formatting callback (which takes the
		433	timestamp, context, level and string message and formats it in the way
		434	it should be logged) and a logging callback (which is responsible for
		435	actually logging the formatted message and telling C<AnyEvent::Log>
		436	whether it has consumed the message, or whether it should be propagated).
		437
		438	For propagation, a context can have any number of attached I<slave
		439	contexts>. Any message that is neither masked by the logging mask nor
		440	masked by the logging callback returning true will be passed to all slave
		441	contexts.
		442
		443	Each call to a logging function will log the message at most once per
		444	context, so it does not matter (much) if there are cycles or if the
		445	message can arrive at the same context via multiple paths.
		446
		447	=head2 DEFAULTS
		448
		449	By default, all logging contexts have an full set of log levels ("all"), a
		450	disabled logging callback and the default formatting callback.
		451
		452	Package contexts have the package name as logging title by default.
		453
		454	They have exactly one slave - the context of the "parent" package. The
		455	parent package is simply defined to be the package name without the last
		456	component, i.e. C<AnyEvent::Debug::Wrapped> becomes C<AnyEvent::Debug>,
		457	and C<AnyEvent> becomes ... C<$AnyEvent::Log::COLLECT> which is the
		458	exception of the rule - just like the "parent" of any single-component
		459	package name in Perl is C<main>, the default slave of any top-level
		460	package context is C<$AnyEvent::Log::COLLECT>.
		461
		462	Since perl packages form only an approximate hierarchy, this slave
		463	context can of course be removed.
		464
		465	All other (anonymous) contexts have no slaves and an empty title by
		466	default.
		467
		468	When the module is loaded it creates the C<$AnyEvent::Log::LOG> logging
		469	context that simply logs everything via C<warn>, without propagating
		470	anything anywhere by default. The purpose of this context is to provide
		471	a convenient place to override the global logging target or to attach
		472	additional log targets. It's not meant for filtering.
		473
		474	It then creates the C<$AnyEvent::Log::FILTER> context whose
		475	purpose is to suppress all messages with priority higher
		476	than C<$ENV{PERL_ANYEVENT_VERBOSE}>. It then attached the
		477	C<$AnyEvent::Log::LOG> context to it. The purpose of the filter context
		478	is to simply provide filtering according to some global log level.
		479
		480	Finally it creates the top-level package context C<$AnyEvent::Log::COLLECT>
		481	and attaches the C<$AnyEvent::Log::FILTER> context to it, but otherwise
		482	leaves it at default config. Its purpose is simply to collect all log
		483	messages system-wide.
		484
		485	The hierarchy is then:
		486
		487	any package, eventually -> $COLLECT -> $FILTER -> $LOG
		488
		489	The effect of all this is that log messages, by default, wander up to the
		490	C<$AnyEvent::Log::COLLECT> context where all messages normally end up,
		491	from there to C<$AnyEvent::Log::FILTER> where log messages with lower
		492	priority then C<$ENV{PERL_ANYEVENT_VERBOSE}> will be filtered out and then
		493	to the C<$AnyEvent::Log::LOG> context to be passed to C<warn>.
		494
		495	This makes it easy to set a global logging level (by modifying $FILTER),
		496	but still allow other contexts to send, for example, their debug and trace
		497	messages to the $LOG target despite the global logging level, or to attach
		498	additional log targets that log messages, regardless of the global logging
		499	level.
		500
		501	It also makes it easy to modify the default warn-logger ($LOG) to
		502	something that logs to a file, or to attach additional logging targets
		503	(such as loggign to a file) by attaching it to $FILTER.
		504
		505	=head2 CREATING/FINDING/DESTROYING CONTEXTS
248		506
249	=over 4	507	=over 4
250		508
		509	=item $ctx = AnyEvent::Log::ctx [$pkg]
		510
		511	This function creates or returns a logging context (which is an object).
		512
		513	If a package name is given, then the context for that packlage is
		514	returned. If it is called without any arguments, then the context for the
		515	callers package is returned (i.e. the same context as a C<AE::log> call
		516	would use).
		517
		518	If C<undef> is given, then it creates a new anonymous context that is not
		519	tied to any package and is destroyed when no longer referenced.
		520
251	=cut	521	=cut
		522
		523	sub ctx(;$) {
		524	my $pkg = @_ ? shift : (caller)[0];
		525
		526	ref $pkg
		527	? $pkg
		528	: defined $pkg
		529	? $CTX{$pkg} \|\|= AnyEvent::Log::_pkg_ctx $pkg
		530	: bless [undef, (1 << 10) - 1 - 1], "AnyEvent::Log::Ctx"
		531	}
		532
		533	=item AnyEvent::Log::reset
		534
		535	Resets all package contexts and recreates the default hierarchy if
		536	necessary, i.e. resets the logging subsystem to defaults, as much as
		537	possible. This process keeps references to contexts held by other parts of
		538	the program intact.
		539
		540	This can be used to implement config-file (re-)loading: before loading a
		541	configuration, reset all contexts.
		542
		543	=cut
		544
		545	sub reset {
		546	# hard to kill complex data structures
		547	# we "recreate" all package loggers and reset the hierarchy
		548	while (my ($k, $v) = each %CTX) {
		549	@$v = ($k, (1 << 10) - 1 - 1, { });
		550
		551	$v->attach ($k =~ /^(.+)::/ ? $CTX{$1} : $AnyEvent::Log::COLLECT);
		552	}
		553
		554	@$_ = ($_->[0], (1 << 10) - 1 - 1)
		555	for $LOG, $FILTER, $COLLECT;
		556
		557	#$LOG->slaves;
		558	$LOG->title ('$AnyEvent::Log::LOG');
		559	$LOG->log_to_warn;
		560
		561	$FILTER->slaves ($LOG);
		562	$FILTER->title ('$AnyEvent::Log::FILTER');
		563	$FILTER->level ($AnyEvent::VERBOSE);
		564
		565	$COLLECT->slaves ($FILTER);
		566	$COLLECT->title ('$AnyEvent::Log::COLLECT');
		567
		568	_reassess;
		569	}
		570
		571	# create the default logger contexts
		572	$LOG = ctx undef;
		573	$FILTER = ctx undef;
		574	$COLLECT = ctx undef;
		575
		576	AnyEvent::Log::reset;
		577
		578	# hello, CPAN, please catch me
		579	package AnyEvent::Log::LOG;
		580	package AE::Log::LOG;
		581	package AnyEvent::Log::FILTER;
		582	package AE::Log::FILTER;
		583	package AnyEvent::Log::COLLECT;
		584	package AE::Log::COLLECT;
		585
		586	package AnyEvent::Log::Ctx;
		587
		588	# 0 1 2 3 4
		589	# [$title, $level, %$slaves, &$logcb, &$fmtcb]
		590
		591	=item $ctx = new AnyEvent::Log::Ctx methodname => param...
		592
		593	This is a convenience constructor that makes it simpler to construct
		594	anonymous logging contexts.
		595
		596	Each key-value pair results in an invocation of the method of the same
		597	name as the key with the value as parameter, unless the value is an
		598	arrayref, in which case it calls the method with the contents of the
		599	array. The methods are called in the same order as specified.
		600
		601	Example: create a new logging context and set both the default logging
		602	level, some slave contexts and a logging callback.
		603
		604	$ctx = new AnyEvent::Log::Ctx
		605	title => "dubious messages",
		606	level => "error",
		607	log_cb => sub { print STDOUT shift; 0 },
		608	slaves => [$ctx1, $ctx, $ctx2],
		609	;
		610
		611	=back
		612
		613	=cut
		614
		615	sub new {
		616	my $class = shift;
		617
		618	my $ctx = AnyEvent::Log::ctx undef;
		619
		620	while (@_) {
		621	my ($k, $v) = splice @_, 0, 2;
		622	$ctx->$k (ref $v eq "ARRAY" ? @$v : $v);
		623	}
		624
		625	bless $ctx, $class # do we really support subclassing, hmm?
		626	}
		627
		628
		629	=head2 CONFIGURING A LOG CONTEXT
		630
		631	The following methods can be used to configure the logging context.
		632
		633	=over 4
		634
		635	=item $ctx->title ([$new_title])
		636
		637	Returns the title of the logging context - this is the package name, for
		638	package contexts, and a user defined string for all others.
		639
		640	If C<$new_title> is given, then it replaces the package name or title.
		641
		642	=cut
		643
		644	sub title {
		645	$_[0][0] = $_[1] if @_ > 1;
		646	$_[0][0]
		647	}
		648
		649	=back
		650
		651	=head3 LOGGING LEVELS
		652
		653	The following methods deal with the logging level set associated with the
		654	log context.
		655
		656	The most common method to use is probably C<< $ctx->level ($level) >>,
		657	which configures the specified and any higher priority levels.
		658
		659	All functions which accept a list of levels also accept the special string
		660	C<all> which expands to all logging levels.
		661
		662	=over 4
		663
		664	=item $ctx->levels ($level[, $level...)
		665
		666	Enables logging for the given levels and disables it for all others.
		667
		668	=item $ctx->level ($level)
		669
		670	Enables logging for the given level and all lower level (higher priority)
		671	ones. In addition to normal logging levels, specifying a level of C<0> or
		672	C<off> disables all logging for this level.
		673
		674	Example: log warnings, errors and higher priority messages.
		675
		676	$ctx->level ("warn");
		677	$ctx->level (5); # same thing, just numeric
		678
		679	=item $ctx->enable ($level[, $level...])
		680
		681	Enables logging for the given levels, leaving all others unchanged.
		682
		683	=item $ctx->disable ($level[, $level...])
		684
		685	Disables logging for the given levels, leaving all others unchanged.
		686
		687	=cut
		688
		689	sub _lvl_lst {
		690	map {
		691	$_ > 0 && $_ <= 9 ? $_+0
		692	: $_ eq "all" ? (1 .. 9)
		693	: $STR2LEVEL{$_} \|\| Carp::croak "$_: not a valid logging level, caught"
		694	} @_
		695	}
		696
		697	our $NOP_CB = sub { 0 };
		698
		699	sub levels {
		700	my $ctx = shift;
		701	$ctx->[1] = 0;
		702	$ctx->[1] \|= 1 << $_
		703	for &_lvl_lst;
		704	AnyEvent::Log::_reassess;
		705	}
		706
		707	sub level {
		708	my $ctx = shift;
		709	my $lvl = $_[0] =~ /^(?:0\|off\|none)$/ ? 0 : (_lvl_lst $_[0])[-1];
		710
		711	$ctx->[1] = ((1 << $lvl) - 1) << 1;
		712	AnyEvent::Log::_reassess;
		713	}
		714
		715	sub enable {
		716	my $ctx = shift;
		717	$ctx->[1] \|= 1 << $_
		718	for &_lvl_lst;
		719	AnyEvent::Log::_reassess;
		720	}
		721
		722	sub disable {
		723	my $ctx = shift;
		724	$ctx->[1] &= ~(1 << $_)
		725	for &_lvl_lst;
		726	AnyEvent::Log::_reassess;
		727	}
		728
		729	=back
		730
		731	=head3 SLAVE CONTEXTS
		732
		733	The following methods attach and detach another logging context to a
		734	logging context.
		735
		736	Log messages are propagated to all slave contexts, unless the logging
		737	callback consumes the message.
		738
		739	=over 4
		740
		741	=item $ctx->attach ($ctx2[, $ctx3...])
		742
		743	Attaches the given contexts as slaves to this context. It is not an error
		744	to add a context twice (the second add will be ignored).
		745
		746	A context can be specified either as package name or as a context object.
		747
		748	=item $ctx->detach ($ctx2[, $ctx3...])
		749
		750	Removes the given slaves from this context - it's not an error to attempt
		751	to remove a context that hasn't been added.
		752
		753	A context can be specified either as package name or as a context object.
		754
		755	=item $ctx->slaves ($ctx2[, $ctx3...])
		756
		757	Replaces all slaves attached to this context by the ones given.
		758
		759	=cut
		760
		761	sub attach {
		762	my $ctx = shift;
		763
		764	$ctx->[2]{$_+0} = $_
		765	for map { AnyEvent::Log::ctx $_ } @_;
		766	}
		767
		768	sub detach {
		769	my $ctx = shift;
		770
		771	delete $ctx->[2]{$_+0}
		772	for map { AnyEvent::Log::ctx $_ } @_;
		773	}
		774
		775	sub slaves {
		776	undef $_[0][2];
		777	&attach;
		778	}
		779
		780	=back
		781
		782	=head3 LOG TARGETS
		783
		784	The following methods configure how the logging context actually does
		785	the logging (which consists of formatting the message and printing it or
		786	whatever it wants to do with it).
		787
		788	=over 4
		789
		790	=item $ctx->log_cb ($cb->($str)
		791
		792	Replaces the logging callback on the context (C<undef> disables the
		793	logging callback).
		794
		795	The logging callback is responsible for handling formatted log messages
		796	(see C<fmt_cb> below) - normally simple text strings that end with a
		797	newline (and are possibly multiline themselves).
		798
		799	It also has to return true iff it has consumed the log message, and false
		800	if it hasn't. Consuming a message means that it will not be sent to any
		801	slave context. When in doubt, return C<0> from your logging callback.
		802
		803	Example: a very simple logging callback, simply dump the message to STDOUT
		804	and do not consume it.
		805
		806	$ctx->log_cb (sub { print STDERR shift; 0 });
		807
		808	You can filter messages by having a log callback that simply returns C<1>
		809	and does not do anything with the message, but this counts as "message
		810	being logged" and might not be very efficient.
		811
		812	Example: propagate all messages except for log levels "debug" and
		813	"trace". The messages will still be generated, though, which can slow down
		814	your program.
		815
		816	$ctx->levels ("debug", "trace");
		817	$ctx->log_cb (sub { 1 }); # do not log, but eat debug and trace messages
		818
		819	=item $ctx->fmt_cb ($fmt_cb->($timestamp, $orig_ctx, $level, $message))
		820
		821	Replaces the formatting callback on the context (C<undef> restores the
		822	default formatter).
		823
		824	The callback is passed the (possibly fractional) timestamp, the original
		825	logging context, the (numeric) logging level and the raw message string
		826	and needs to return a formatted log message. In most cases this will be a
		827	string, but it could just as well be an array reference that just stores
		828	the values.
		829
		830	If, for some reason, you want to use C<caller> to find out more baout the
		831	logger then you should walk up the call stack until you are no longer
		832	inside the C<AnyEvent::Log> package.
		833
		834	Example: format just the raw message, with numeric log level in angle
		835	brackets.
		836
		837	$ctx->fmt_cb (sub {
		838	my ($time, $ctx, $lvl, $msg) = @_;
		839
		840	"<$lvl>$msg\n"
		841	});
		842
		843	Example: return an array reference with just the log values, and use
		844	C<PApp::SQL::sql_exec> to store the emssage in a database.
		845
		846	$ctx->fmt_cb (sub { \@_ });
		847	$ctx->log_cb (sub {
		848	my ($msg) = @_;
		849
		850	sql_exec "insert into log (when, subsys, prio, msg) values (?, ?, ?, ?)",
		851	$msg->[0] + 0,
		852	"$msg->[1]",
		853	$msg->[2] + 0,
		854	"$msg->[3]";
		855
		856	0
		857	});
		858
		859	=item $ctx->log_to_warn
		860
		861	Sets the C<log_cb> to simply use C<CORE::warn> to report any messages
		862	(usually this logs to STDERR).
		863
		864	=item $ctx->log_to_file ($path)
		865
		866	Sets the C<log_cb> to log to a file (by appending), unbuffered.
		867
		868	=item $ctx->log_to_path ($path)
		869
		870	Same as C<< ->log_to_file >>, but opens the file for each message. This
		871	is much slower, but allows you to change/move/rename/delete the file at
		872	basically any time.
		873
		874	Needless(?) to say, if you do not want to be bitten by some evil person
		875	calling C<chdir>, the path should be absolute. Doesn't help with
		876	C<chroot>, but hey...
		877
		878	=item $ctx->log_to_syslog ([$facility])
		879
		880	Logs all messages via L<Sys::Syslog>, mapping C<trace> to C<debug> and
		881	all the others in the obvious way. If specified, then the C<$facility> is
		882	used as the facility (C<user>, C<auth>, C<local0> and so on). The default
		883	facility is C<user>.
		884
		885	Note that this function also sets a C<fmt_cb> - the logging part requires
		886	an array reference with [$level, $str] as input.
		887
		888	=cut
		889
		890	sub log_cb {
		891	my ($ctx, $cb) = @_;
		892
		893	$ctx->[3] = $cb;
		894	}
		895
		896	sub fmt_cb {
		897	my ($ctx, $cb) = @_;
		898
		899	$ctx->[4] = $cb;
		900	}
		901
		902	sub log_to_warn {
		903	my ($ctx, $path) = @_;
		904
		905	$ctx->log_cb (sub {
		906	warn shift;
		907	0
		908	});
		909	}
		910
		911	sub log_to_file {
		912	my ($ctx, $path) = @_;
		913
		914	open my $fh, ">>", $path
		915	or die "$path: $!";
		916
		917	$ctx->log_cb (sub {
		918	syswrite $fh, shift;
		919	0
		920	});
		921	}
		922
		923	sub log_to_path {
		924	my ($ctx, $path) = @_;
		925
		926	$ctx->log_cb (sub {
		927	open my $fh, ">>", $path
		928	or die "$path: $!";
		929
		930	syswrite $fh, shift;
		931	0
		932	});
		933	}
		934
		935	sub log_to_syslog {
		936	my ($ctx, $facility) = @_;
		937
		938	require Sys::Syslog;
		939
		940	$ctx->fmt_cb (sub {
		941	my $str = $_[3];
		942	$str =~ s/\n(?=.)/\n+ /g;
		943
		944	[$_[2], "($_[1][0]) $str"]
		945	});
		946
		947	$facility \|\|= "user";
		948
		949	$ctx->log_cb (sub {
		950	my $lvl = $_[0][0] < 9 ? $_[0][0] : 8;
		951
		952	Sys::Syslog::syslog ("$facility\|" . ($lvl - 1), $_)
		953	for split /\n/, $_[0][1];
		954
		955	0
		956	});
		957	}
		958
		959	=back
		960
		961	=head3 MESSAGE LOGGING
		962
		963	These methods allow you to log messages directly to a context, without
		964	going via your package context.
		965
		966	=over 4
		967
		968	=item $ctx->log ($level, $msg[, @params])
		969
		970	Same as C<AnyEvent::Log::log>, but uses the given context as log context.
		971
		972	=item $logger = $ctx->logger ($level[, \$enabled])
		973
		974	Same as C<AnyEvent::Log::logger>, but uses the given context as log
		975	context.
		976
		977	=cut
		978
		979	*log = \&AnyEvent::Log::_log;
		980	*logger = \&AnyEvent::Log::_logger;
		981
		982	=back
		983
		984	=cut
		985
		986	package AnyEvent::Log;
		987
		988	=head1 CONFIGURATION VIA $ENV{PERL_ANYEVENT_LOG}
		989
		990	Logging can also be configured by setting the environment variable
		991	C<PERL_ANYEVENT_LOG> (or C<AE_LOG>).
		992
		993	The value consists of one or more logging context specifications separated
		994	by C<:> or whitespace. Each logging specification in turn starts with a
		995	context name, followed by C<=>, followed by zero or more comma-separated
		996	configuration directives, here are some examples:
		997
		998	# set default logging level
		999	filter=warn
		1000
		1001	# log to file instead of to stderr
		1002	log=file=/tmp/mylog
		1003
		1004	# log to file in addition to stderr
		1005	log=+%file:%file=file=/tmp/mylog
		1006
		1007	# enable debug log messages, log warnings and above to syslog
		1008	filter=debug:log=+%warnings:%warnings=warn,syslog=LOG_LOCAL0
		1009
		1010	# log trace messages (only) from AnyEvent::Debug to file
		1011	AnyEvent::Debug=+%trace:%trace=only,trace,file=/tmp/tracelog
		1012
		1013	A context name in the log specification can be any of the following:
		1014
		1015	=over 4
		1016
		1017	=item C<collect>, C<filter>, C<log>
		1018
		1019	Correspond to the three predefined C<$AnyEvent::Log::COLLECT>,
		1020	C<AnyEvent::Log::FILTER> and C<$AnyEvent::Log::LOG> contexts.
		1021
		1022	=item C<%name>
		1023
		1024	Context names starting with a C<%> are anonymous contexts created when the
		1025	name is first mentioned. The difference to package contexts is that by
		1026	default they have no attached slaves.
		1027
		1028	=item a perl package name
		1029
		1030	Any other string references the logging context associated with the given
		1031	Perl C<package>. In the unlikely case where you want to specify a package
		1032	context that matches on of the other context name forms, you can add a
		1033	C<::> to the package name to force interpretation as a package.
		1034
		1035	=back
		1036
		1037	The configuration specifications can be any number of the following:
		1038
		1039	=over 4
		1040
		1041	=item C<stderr>
		1042
		1043	Configures the context to use Perl's C<warn> function (which typically
		1044	logs to C<STDERR>). Works like C<log_to_warn>.
		1045
		1046	=item C<file=>I<path>
		1047
		1048	Configures the context to log to a file with the given path. Works like
		1049	C<log_to_file>.
		1050
		1051	=item C<path=>I<path>
		1052
		1053	Configures the context to log to a file with the given path. Works like
		1054	C<log_to_path>.
		1055
		1056	=item C<syslog> or C<syslog=>I<expr>
		1057
		1058	Configures the context to log to syslog. If I<expr> is given, then it is
		1059	evaluated in the L<Sys::Syslog> package, so you could use:
		1060
		1061	log=syslog=LOG_LOCAL0
		1062
		1063	=item C<nolog>
		1064
		1065	Configures the context to not log anything by itself, which is the
		1066	default. Same as C<< $ctx->log_cb (undef) >>.
		1067
		1068	=item C<0> or C<off>
		1069
		1070	Sets the logging level of the context ot C<0>, i.e. all messages will be
		1071	filtered out.
		1072
		1073	=item C<all>
		1074
		1075	Enables all logging levels, i.e. filtering will effectively be switched
		1076	off (the default).
		1077
		1078	=item C<only>
		1079
		1080	Disables all logging levels, and changes the interpretation of following
		1081	level specifications to enable the specified level only.
		1082
		1083	Example: only enable debug messages for a context.
		1084
		1085	context=only,debug
		1086
		1087	=item C<except>
		1088
		1089	Enables all logging levels, and changes the interpretation of following
		1090	level specifications to disable that level. Rarely used.
		1091
		1092	Example: enable all logging levels except fatal and trace (this is rather
		1093	nonsensical).
		1094
		1095	filter=exept,fatal,trace
		1096
		1097	=item C<level>
		1098
		1099	Enables all logging levels, and changes the interpretation of following
		1100	level specifications to be "that level or any higher priority
		1101	message". This is the default.
		1102
		1103	Example: log anything at or above warn level.
		1104
		1105	filter=warn
		1106
		1107	# or, more verbose
		1108	filter=only,level,warn
		1109
		1110	=item C<1>..C<9> or a logging level name (C<error>, C<debug> etc.)
		1111
		1112	A numeric loglevel or the name of a loglevel will be interpreted according
		1113	to the most recent C<only>, C<except> or C<level> directive. By default,
		1114	specifying a logging level enables that and any higher priority messages.
		1115
		1116	=item C<+>I<context>
		1117
		1118	Attaches the named context as slave to the context.
		1119
		1120	=item C<+>
		1121
		1122	A line C<+> detaches all contexts, i.e. clears the slave list from the
		1123	context. Anonymous (C<%name>) contexts have no attached slaves by default,
		1124	but package contexts have the parent context as slave by default.
		1125
		1126	Example: log messages from My::Module to a file, do not send them to the
		1127	default log collector.
		1128
		1129	My::Module=+,file=/tmp/mymodulelog
		1130
		1131	=back
		1132
		1133	Any character can be escaped by prefixing it with a C<\> (backslash), as
		1134	usual, so to log to a file containing a comma, colon, backslash and some
		1135	spaces in the filename, you would do this:
		1136
		1137	PERL_ANYEVENT_LOG='log=file=/some\ \:file\ with\,\ \\-escapes'
		1138
		1139	Since whitespace (which includes newlines) is allowed, it is fine to
		1140	specify multiple lines in C<PERL_ANYEVENT_LOG>, e.g.:
		1141
		1142	PERL_ANYEVENT_LOG="
		1143	filter=warn
		1144	AnyEvent::Debug=+%trace
		1145	%trace=only,trace,+log
		1146	" myprog
		1147
		1148	Also, in the unlikely case when you want to concatenate specifications,
		1149	use whitespace as separator, as C<::> will be interpreted as part of a
		1150	module name, an empty spec with two separators:
		1151
		1152	PERL_ANYEVENT_LOG="$PERL_ANYEVENT_LOG MyMod=debug"
		1153
		1154	=cut
		1155
		1156	for (my $spec = $ENV{PERL_ANYEVENT_LOG}) {
		1157	my %anon;
		1158
		1159	my $pkg = sub {
		1160	$_[0] eq "log" ? $LOG
		1161	: $_[0] eq "filter" ? $FILTER
		1162	: $_[0] eq "collect" ? $COLLECT
		1163	: $_[0] =~ /^%(.+)$/ ? ($anon{$1} \|\|= ctx undef)
		1164	: $_[0] =~ /^(.*?)(?:::)?$/ ? ctx "$1" # egad :/
		1165	: die # never reached?
		1166	};
		1167
		1168	/\G[[:space:]]+/gc; # skip initial whitespace
		1169
		1170	while (/\G((?:[^:=[:space:]]+\|::\|\\.)+)=/gc) {
		1171	my $ctx = $pkg->($1);
		1172	my $level = "level";
		1173
		1174	while (/\G((?:[^,:[:space:]]+\|::\|\\.)+)/gc) {
		1175	for ("$1") {
		1176	if ($_ eq "stderr" ) { $ctx->log_to_warn;
		1177	} elsif (/^file=(.+)/ ) { $ctx->log_to_file ("$1");
		1178	} elsif (/^path=(.+)/ ) { $ctx->log_to_path ("$1");
		1179	} elsif (/syslog(?:=(.*))?/ ) { require Sys::Syslog; $ctx->log_to_syslog ($1);
		1180	} elsif ($_ eq "nolog" ) { $ctx->log_cb (undef);
		1181	} elsif (/^\+(.+)$/ ) { $ctx->attach ($pkg->("$1"));
		1182	} elsif ($_ eq "+" ) { $ctx->slaves;
		1183	} elsif ($_ eq "off" or $_ eq "0") { $ctx->level (0);
		1184	} elsif ($_ eq "all" ) { $ctx->level ("all");
		1185	} elsif ($_ eq "level" ) { $ctx->level ("all"); $level = "level";
		1186	} elsif ($_ eq "only" ) { $ctx->level ("off"); $level = "enable";
		1187	} elsif ($_ eq "except" ) { $ctx->level ("all"); $level = "disable";
		1188	} elsif (/^\d$/ ) { $ctx->$level ($_);
		1189	} elsif (exists $STR2LEVEL{$_} ) { $ctx->$level ($_);
		1190	} else { die "PERL_ANYEVENT_LOG ($spec): parse error at '$_'\n";
		1191	}
		1192	}
		1193
		1194	/\G,/gc or last;
		1195	}
		1196
		1197	/\G[:[:space:]]+/gc or last;
		1198	}
		1199
		1200	/\G[[:space:]]+/gc; # skip trailing whitespace
		1201
		1202	if (/\G(.+)/g) {
		1203	die "PERL_ANYEVENT_LOG ($spec): parse error at '$1'\n";
		1204	}
		1205	}
252		1206
253	1;	1207	1;
		1208
		1209	=head1 EXAMPLES
		1210
		1211	This section shows some common configurations, both as code, and as
		1212	C<PERL_ANYEVENT_LOG> string.
		1213
		1214	=over 4
		1215
		1216	=item Setting the global logging level.
		1217
		1218	Either put C<PERL_ANYEVENT_VERBOSE=><number> into your environment before
		1219	running your program, use C<PERL_ANYEVENT_LOG> or modify the log level of
		1220	the root context at runtime:
		1221
		1222	PERL_ANYEVENT_VERBOSE=5 ./myprog
		1223
		1224	PERL_ANYEVENT_LOG=log=warn
		1225
		1226	$AnyEvent::Log::FILTER->level ("warn");
		1227
		1228	=item Append all messages to a file instead of sending them to STDERR.
		1229
		1230	This is affected by the global logging level.
		1231
		1232	$AnyEvent::Log::LOG->log_to_file ($path);
		1233
		1234	PERL_ANYEVENT_LOG=log=file=/some/path
		1235
		1236	=item Write all messages with priority C<error> and higher to a file.
		1237
		1238	This writes them only when the global logging level allows it, because
		1239	it is attached to the default context which is invoked I<after> global
		1240	filtering.
		1241
		1242	$AnyEvent::Log::FILTER->attach
		1243	new AnyEvent::Log::Ctx log_to_file => $path);
		1244
		1245	PERL_ANYEVENT_LOG=filter=+%filelogger:%filelogger=file=/some/path
		1246
		1247	This writes them regardless of the global logging level, because it is
		1248	attached to the toplevel context, which receives all messages I<before>
		1249	the global filtering.
		1250
		1251	$AnyEvent::Log::COLLECT->attach (
		1252	new AnyEvent::Log::Ctx log_to_file => $path);
		1253
		1254	PERL_ANYEVENT_LOG=%filelogger=file=/some/path:collect=+%filelogger
		1255
		1256	In both cases, messages are still written to STDERR.
		1257
		1258	=item Write trace messages (only) from L<AnyEvent::Debug> to the default logging target(s).
		1259
		1260	Attach the C<$AnyEvent::Log::LOG> context to the C<AnyEvent::Debug>
		1261	context - this simply circumvents the global filtering for trace messages.
		1262
		1263	my $debug = AnyEvent::Debug->AnyEvent::Log::ctx;
		1264	$debug->attach ($AnyEvent::Log::LOG);
		1265
		1266	PERL_ANYEVENT_LOG=AnyEvent::Debug=+log
		1267
		1268	This of course works for any package, not just L<AnyEvent::Debug>, but
		1269	assumes the log level for AnyEvent::Debug hasn't been changed from the
		1270	default.
254		1271
255	=back	1272	=back
256		1273
257	=head1 AUTHOR	1274	=head1 AUTHOR
258		1275
259	Marc Lehmann <schmorp@schmorp.de>	1276	Marc Lehmann <schmorp@schmorp.de>
260	http://home.schmorp.de/	1277	http://home.schmorp.de/
261		1278
262	=cut	1279	=cut
		1280

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Comparing AnyEvent/lib/AnyEvent/Log.pm (file contents): Revision 1.3 by root, Wed Aug 17 02:02:38 2011 UTC vs. Revision 1.42 by root, Thu Sep 1 22:38:11 2011 UTC

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Comparing AnyEvent/lib/AnyEvent/Log.pm (file contents):
Revision 1.3 by root, Wed Aug 17 02:02:38 2011 UTC vs.
Revision 1.42 by root, Thu Sep 1 22:38:11 2011 UTC