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

Comparing AnyEvent/lib/AnyEvent/Log.pm (file contents):
Revision 1.23 by root, Sun Aug 21 03:20:52 2011 UTC vs.
Revision 1.27 by root, Wed Aug 24 23:59:10 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 use	7	Simple uses:
		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!"; # never returns	14	AE::log fatal => "the bit toggled! run!"; # never returns
14		15
15	# "complex" use (for speed sensitive code)	16	"Complex" uses (for speed sensitive code):
		17
16	use AnyEvent::Log;	18	use AnyEvent::Log;
17		19
18	my $tracer = AnyEvent::Log::logger trace => \$my $trace;	20	my $tracer = AnyEvent::Log::logger trace => \$my $trace;
19		21
20	$tracer->("i am here") if $trace;	22	$tracer->("i am here") if $trace;
21	$tracer->(sub { "lots of data: " . Dumper $self }) if $trace;	23	$tracer->(sub { "lots of data: " . Dumper $self }) if $trace;
22		24
23	# configuration	25	Configuration (also look at the EXAMPLES section):
24		26
25	# set logging for the current package to errors and higher only	27	# set logging for the current package to errors and higher only
26	AnyEvent::Log::ctx->level ("error");	28	AnyEvent::Log::ctx->level ("error");
27		29
28	# set logging level to suppress anything below "notice"	30	# set logging level to suppress anything below "notice"
…		…
32	# regardless of (most) other settings	34	# regardless of (most) other settings
33	$AnyEvent::Log::COLLECT->attach (new AnyEvent::Log::Ctx	35	$AnyEvent::Log::COLLECT->attach (new AnyEvent::Log::Ctx
34	level => "critical",	36	level => "critical",
35	log_to_syslog => 0,	37	log_to_syslog => 0,
36	);	38	);
37
38	# see also EXAMPLES, below
39		39
40	=head1 DESCRIPTION	40	=head1 DESCRIPTION
41		41
42	This module implements a relatively simple "logging framework". It doesn't	42	This module implements a relatively simple "logging framework". It doesn't
43	attempt to be "the" logging solution or even "a" logging solution for	43	attempt to be "the" logging solution or even "a" logging solution for
…		…
515	@$_ = ($_->[0], (1 << 10) - 1 - 1)	515	@$_ = ($_->[0], (1 << 10) - 1 - 1)
516	for $LOG, $FILTER, $COLLECT;	516	for $LOG, $FILTER, $COLLECT;
517		517
518	$LOG->slaves;	518	$LOG->slaves;
519	$LOG->title ('$AnyEvent::Log::LOG');	519	$LOG->title ('$AnyEvent::Log::LOG');
520	$LOG->log_cb (sub {	520	$LOG->log_to_warn;
521	warn shift;
522	0
523	});
524		521
525	$FILTER->slaves ($LOG);	522	$FILTER->slaves ($LOG);
526	$FILTER->title ('$AnyEvent::Log::FILTER');	523	$FILTER->title ('$AnyEvent::Log::FILTER');
527	$FILTER->level ($AnyEvent::VERBOSE);	524	$FILTER->level ($AnyEvent::VERBOSE);
528		525
…		…
789	logging context, the (numeric) logging level and the raw message string	786	logging context, the (numeric) logging level and the raw message string
790	and needs to return a formatted log message. In most cases this will be a	787	and needs to return a formatted log message. In most cases this will be a
791	string, but it could just as well be an array reference that just stores	788	string, but it could just as well be an array reference that just stores
792	the values.	789	the values.
793		790
794	If, for some reaosn, you want to use C<caller> to find out more baout the	791	If, for some reason, you want to use C<caller> to find out more baout the
795	logger then you should walk up the call stack until you are no longer	792	logger then you should walk up the call stack until you are no longer
796	inside the C<AnyEvent::Log> package.	793	inside the C<AnyEvent::Log> package.
797		794
798	Example: format just the raw message, with numeric log level in angle	795	Example: format just the raw message, with numeric log level in angle
799	brackets.	796	brackets.
…		…
818	"$msg->[3]";	815	"$msg->[3]";
819		816
820	0	817	0
821	});	818	});
822		819
		820	=item $ctx->log_to_warn
		821
		822	Sets the C<log_cb> to simply use C<CORE::warn> to report any messages
		823	(usually this logs to STDERR).
		824
823	=item $ctx->log_to_file ($path)	825	=item $ctx->log_to_file ($path)
824		826
825	Sets the C<log_cb> to log to a file (by appending), unbuffered.	827	Sets the C<log_cb> to log to a file (by appending), unbuffered.
826		828
827	=item $ctx->log_to_path ($path)	829	=item $ctx->log_to_path ($path)
828		830
829	Same as C<< ->log_to_file >>, but opens the file for each message. This	831	Same as C<< ->log_to_file >>, but opens the file for each message. This
830	is much slower, but allows you to change/move/rename/delete the file at	832	is much slower, but allows you to change/move/rename/delete the file at
831	basically any time.	833	basically any time.
		834
		835	Needless(?) to say, if you do not want to be bitten by some evil person
		836	calling C<chdir>, the path should be absolute. Doesn't help with
		837	C<chroot>, but hey...
832		838
833	=item $ctx->log_to_syslog ([$log_flags])	839	=item $ctx->log_to_syslog ([$log_flags])
834		840
835	Logs all messages via L<Sys::Syslog>, mapping C<trace> to C<debug> and all	841	Logs all messages via L<Sys::Syslog>, mapping C<trace> to C<debug> and all
836	the others in the obvious way. If specified, then the C<$log_flags> are	842	the others in the obvious way. If specified, then the C<$log_flags> are
…		…
852	my ($ctx, $cb) = @_;	858	my ($ctx, $cb) = @_;
853		859
854	$ctx->[4] = $cb;	860	$ctx->[4] = $cb;
855	}	861	}
856		862
		863	sub log_to_warn {
		864	my ($ctx, $path) = @_;
		865
		866	$ctx->log_cb (sub {
		867	warn shift;
		868	0
		869	});
		870	}
		871
857	sub log_to_file {	872	sub log_to_file {
858	my ($ctx, $path) = @_;	873	my ($ctx, $path) = @_;
859		874
860	open my $fh, ">>", $path	875	open my $fh, ">>", $path
861	or die "$path: $!";	876	or die "$path: $!";
…		…
864	syswrite $fh, shift;	879	syswrite $fh, shift;
865	0	880	0
866	});	881	});
867	}	882	}
868		883
869	sub log_to_file {	884	sub log_to_path {
870	my ($ctx, $path) = @_;	885	my ($ctx, $path) = @_;
871		886
872	$ctx->log_cb (sub {	887	$ctx->log_cb (sub {
873	open my $fh, ">>", $path	888	open my $fh, ">>", $path
874	or die "$path: $!";	889	or die "$path: $!";
…		…
921	=cut	936	=cut
922		937
923	*log = \&AnyEvent::Log::_log;	938	*log = \&AnyEvent::Log::_log;
924	*logger = \&AnyEvent::Log::_logger;	939	*logger = \&AnyEvent::Log::_logger;
925		940
		941	=back
		942
		943	=cut
		944
		945	package AnyEvent::Log;
		946
		947	=head1 CONFIGURATION VIA $ENV{PERL_ANYEVENT_LOG}
		948
		949	Logging can also be configured by setting the environment variable
		950	C<PERL_ANYEVENT_LOG> (or C<AE_LOG>).
		951
		952	The value consists of one or more logging context specifications separated
		953	by C<:> or whitespace. Each logging specification in turn starts with a
		954	context name, followed by C<=>, followed by zero or more comma-separated
		955	configuration directives, here are some examples:
		956
		957	# set default logging level
		958	filter=warn
		959
		960	# log to file instead of to stderr
		961	log=file=/tmp/mylog
		962
		963	# log to file in addition to stderr
		964	log=+%file:%file=file=/tmp/mylog
		965
		966	# enable debug log messages, log warnings and above to syslog
		967	filter=debug:log=+%warnings:%warnings=warn,syslog=LOG_LOCAL0
		968
		969	# log trace messages (only) from AnyEvent::Debug to file
		970	AnyEvent::Debug=+%trace:%trace=only,trace,file=/tmp/tracelog
		971
		972	A context name in the log specification can be any of the following:
		973
		974	=over 4
		975
		976	=item C<collect>, C<filter>, C<log>
		977
		978	Correspond to the three predefined C<$AnyEvent::Log::COLLECT>,
		979	C<AnyEvent::Log::FILTER> and C<$AnyEvent::Log::LOG> contexts.
		980
		981	=item C<%name>
		982
		983	Context names starting with a C<%> are anonymous contexts created when the
		984	name is first mentioned. The difference to package contexts is that by
		985	default they have no attached slaves.
		986
		987	=item a perl package name
		988
		989	Any other string references the logging context associated with the given
		990	Perl C<package>. In the unlikely case where you want to specify a package
		991	context that matches on of the other context name forms, you can add a
		992	C<::> to the package name to force interpretation as a package.
		993
		994	=back
		995
		996	The configuration specifications can be any number of the following:
		997
		998	=over 4
		999
		1000	=item C<stderr>
		1001
		1002	Configures the context to use Perl's C<warn> function (which typically
		1003	logs to C<STDERR>). Works like C<log_to_warn>.
		1004
		1005	=item C<file=>I<path>
		1006
		1007	Configures the context to log to a file with the given path. Works like
		1008	C<log_to_file>.
		1009
		1010	=item C<path=>I<path>
		1011
		1012	Configures the context to log to a file with the given path. Works like
		1013	C<log_to_path>.
		1014
		1015	=item C<syslog> or C<syslog=>I<expr>
		1016
		1017	Configured the context to log to syslog. If I<expr> is given, then it is
		1018	evaluated in the L<Sys::Syslog> package, so you could use:
		1019
		1020	log=syslog=LOG_LOCAL0
		1021
		1022	=item C<nolog>
		1023
		1024	Configures the context to not log anything by itself, which is the
		1025	default. Same as C<< $ctx->log_cb (undef) >>.
		1026
		1027	=item C<0> or C<off>
		1028
		1029	Sets the logging level of the context ot C<0>, i.e. all messages will be
		1030	filtered out.
		1031
		1032	=item C<all>
		1033
		1034	Enables all logging levels, i.e. filtering will effectively be switched
		1035	off (the default).
		1036
		1037	=item C<only>
		1038
		1039	Disables all logging levels, and changes the interpretation of following
		1040	level specifications to enable the specified level only.
		1041
		1042	Example: only enable debug messages for a context.
		1043
		1044	context=only,debug
		1045
		1046	=item C<except>
		1047
		1048	Enables all logging levels, and changes the interpretation of following
		1049	level specifications to disable that level. Rarely used.
		1050
		1051	Example: enable all logging levels except fatal and trace (this is rather
		1052	nonsensical).
		1053
		1054	filter=exept,fatal,trace
		1055
		1056	=item C<level>
		1057
		1058	Enables all logging levels, and changes the interpretation of following
		1059	level specifications to be "that level or any higher priority
		1060	message". This is the default.
		1061
		1062	Example: log anything at or above warn level.
		1063
		1064	filter=warn
		1065
		1066	# or, more verbose
		1067	filter=only,level,warn
		1068
		1069	=item C<1>..C<9>, a logging level name (C<error>, C<debug> etc.)
		1070
		1071	A numeric loglevel or the name of a loglevel will be interpreted according
		1072	to the most recent C<only>, C<except> or C<level> directive. By default,
		1073	specifying a logging level enables that and any higher priority messages.
		1074
		1075	=item C<+>I<context>
		1076
		1077	Adds/attaches the named context as slave to the context.
		1078
		1079	=item C<+>
		1080
		1081	A line C<+> clears the slave list form the context. Anonymous (C<%name>)
		1082	contexts have no slaves by default, but package contexts have the parent
		1083	context as slave by default.
		1084
		1085	Example: log messages from My::Module to a file, do not send them to the
		1086	default log collector.
		1087
		1088	My::Module=+,file=/tmp/mymodulelog
		1089
		1090	=back
		1091
		1092	=cut
		1093
		1094	for (my $spec = $ENV{PERL_ANYEVENT_LOG}) {
		1095	my %anon;
		1096
		1097	my $pkg = sub {
		1098	$_[0] eq "log" ? $LOG
		1099	: $_[0] eq "filter" ? $FILTER
		1100	: $_[0] eq "collect" ? $COLLECT
		1101	: $_[0] =~ /^%(.+)$/ && $anon{$1} \|\|= ctx undef
		1102	: $_[0] =~ /^(.*?)(?:::)?$/ && ctx "$1" # egad :/
		1103	};
		1104
		1105	while (/\G((?:[^:=]+\|::\|\\.)+)=/gc) {
		1106	my $ctx = $pkg->($1);
		1107	my $level = "level";
		1108
		1109	while (/\G((?:[^,:[:space:]]+\|::\|\\.)+)/gc) {
		1110	for ("$1") {
		1111	if ($_ eq "stderr" ) { $ctx->log_to_warn;
		1112	} elsif (/^file=(.+)/ ) { $ctx->log_to_file ("$1");
		1113	} elsif (/^path=(.+)/ ) { $ctx->log_to_path ("$1");
		1114	} elsif (/syslog(?:=(.*))?/ ) { require Sys::Syslog; $ctx->log_to_syslog (eval "package Sys::Syslog; $1");
		1115	} elsif ($_ eq "nolog" ) { $ctx->log_cb (undef);
		1116	} elsif (/^\+(.+)$/ ) { $ctx->attach ($pkg->("$1"));
		1117	} elsif ($_ eq "+" ) { $ctx->slaves;
		1118	} elsif ($_ eq "off" or $_ eq "0") { $ctx->level (0);
		1119	} elsif ($_ eq "all" ) { $ctx->level ("all");
		1120	} elsif ($_ eq "level" ) { $ctx->level ("all"); $level = "level";
		1121	} elsif ($_ eq "only" ) { $ctx->level ("off"); $level = "enable";
		1122	} elsif ($_ eq "except" ) { $ctx->level ("all"); $level = "disable";
		1123	} elsif (/^\d$/ ) { $ctx->$level ($_);
		1124	} elsif (exists $STR2LEVEL{$_} ) { $ctx->$level ($_);
		1125	} else { die "PERL_ANYEVENT_LOG ($spec): parse error at '$_'\n";
		1126	}
		1127	}
		1128
		1129	/\G,/gc or last;
		1130	}
		1131
		1132	/\G[:[:space:]]/gc or last;
		1133	}
		1134
		1135	if (/\G(.+)/g) {
		1136	die "PERL_ANYEVENT_LOG ($spec): parse error at '$1'\n";
		1137	}
		1138	}
		1139
926	1;	1140	1;
927
928	=back
929		1141
930	=head1 EXAMPLES	1142	=head1 EXAMPLES
931		1143
932	This section shows some common configurations.	1144	This section shows some common configurations.
933		1145

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Comparing AnyEvent/lib/AnyEvent/Log.pm (file contents): Revision 1.23 by root, Sun Aug 21 03:20:52 2011 UTC vs. Revision 1.27 by root, Wed Aug 24 23:59:10 2011 UTC

Diff Legend

Comparing AnyEvent/lib/AnyEvent/Log.pm (file contents):
Revision 1.23 by root, Sun Aug 21 03:20:52 2011 UTC vs.
Revision 1.27 by root, Wed Aug 24 23:59:10 2011 UTC