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=head1 NAME |
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AnyEvent::Log - simple logging "framework" |
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=head1 SYNOPSIS |
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# simple use |
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use AnyEvent; |
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AE::log debug => "hit my knee"; |
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AE::log warn => "it's a bit too hot"; |
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AE::log error => "the flag was false!"; |
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AE::log fatal => "the bit toggled! run!"; |
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# "complex" use |
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use AnyEvent::Log; |
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my $tracer = AnyEvent::Log::logger trace => \$my $trace; |
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$tracer->("i am here") if $trace; |
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$tracer->(sub { "lots of data: " . Dumper $self }) if $trace; |
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# configuration |
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# set logging for the current package to errors and higher only |
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AnyEvent::Log::ctx->level ("error"); |
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# set logging globally to anything below debug |
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1.18 |
$AnyEvent::Log::FILTER->level ("notice"); |
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# see also EXAMPLES, below |
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1.1 |
=head1 DESCRIPTION |
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This module implements a relatively simple "logging framework". It doesn't |
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attempt to be "the" logging solution or even "a" logging solution for |
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AnyEvent - AnyEvent simply creates logging messages internally, and this |
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module more or less exposes the mechanism, with some extra spiff to allow |
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using it from other modules as well. |
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1.20 |
Remember that the default verbosity level is C<0> (C<off>), so nothing |
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will be logged, unless you set C<PERL_ANYEVENT_VERBOSE> to a higher number |
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before starting your program, or change the logging level at runtime with |
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something like: |
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1.2 |
|
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1.18 |
use AnyEvent::Log; |
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AnyEvent::Log::FILTER->level ("info"); |
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|
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1.10 |
The design goal behind this module was to keep it simple (and small), |
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but make it powerful enough to be potentially useful for any module, and |
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extensive enough for the most common tasks, such as logging to multiple |
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targets, or being able to log into a database. |
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1.14 |
The amount of documentation might indicate otherwise, but the module is |
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1.18 |
still just below 300 lines of code. |
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=head1 LOGGING LEVELS |
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Logging levels in this module range from C<1> (highest priority) to C<9> |
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(lowest priority). Note that the lowest numerical value is the highest |
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priority, so when this document says "higher priority" it means "lower |
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numerical value". |
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Instead of specifying levels by name you can also specify them by aliases: |
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LVL NAME SYSLOG PERL NOTE |
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1 fatal emerg exit aborts program! |
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2 alert |
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3 critical crit |
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4 error err die |
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5 warn warning |
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6 note notice |
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7 info |
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8 debug |
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9 trace |
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As you can see, some logging levels have multiple aliases - the first one |
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is the "official" name, the second one the "syslog" name (if it differs) |
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and the third one the "perl" name, suggesting that you log C<die> messages |
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at C<error> priority. |
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You can normally only log a single message at highest priority level |
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(C<1>, C<fatal>), because logging a fatal message will also quit the |
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program - so use it sparingly :) |
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Some methods also offer some extra levels, such as C<0>, C<off>, C<none> |
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or C<all> - these are only valid in the methods they are documented for. |
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1.14 |
|
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1.9 |
=head1 LOGGING FUNCTIONS |
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These functions allow you to log messages. They always use the caller's |
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1.18 |
package as a "logging context". Also, the main logging function C<log> is |
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callable as C<AnyEvent::log> or C<AE::log> when the C<AnyEvent> module is |
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loaded. |
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=over 4 |
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=cut |
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package AnyEvent::Log; |
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1.2 |
use Carp (); |
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1.1 |
use POSIX (); |
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use AnyEvent (); BEGIN { AnyEvent::common_sense } |
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use AnyEvent::Util (); |
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our $VERSION = $AnyEvent::VERSION; |
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our ($COLLECT, $FILTER, $LOG); |
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our ($now_int, $now_str1, $now_str2); |
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# Format Time, not public - yet? |
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sub ft($) { |
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my $i = int $_[0]; |
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my $f = sprintf "%06d", 1e6 * ($_[0] - $i); |
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($now_int, $now_str1, $now_str2) = ($i, split /\x01/, POSIX::strftime "%Y-%m-%d %H:%M:%S.\x01 %z", localtime $i) |
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if $now_int != $i; |
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"$now_str1$f$now_str2" |
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} |
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1.18 |
our %CTX; # all package contexts |
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# creates a default package context object for the given package |
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sub _pkg_ctx($) { |
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my $ctx = bless [$_[0], (1 << 10) - 1 - 1, {}], "AnyEvent::Log::Ctx"; |
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# link "parent" package |
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my $parent = $_[0] =~ /^(.+)::/ |
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? $CTX{$1} ||= &_pkg_ctx ("$1") |
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: $COLLECT; |
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$ctx->[2]{$parent+0} = $parent; |
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$ctx |
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} |
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1.2 |
=item AnyEvent::Log::log $level, $msg[, @args] |
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Requests logging of the given C<$msg> with the given log level. |
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For C<fatal> log levels, the program will abort. |
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If only a C<$msg> is given, it is logged as-is. With extra C<@args>, the |
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C<$msg> is interpreted as an sprintf format string. |
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The C<$msg> should not end with C<\n>, but may if that is convenient for |
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you. Also, multiline messages are handled properly. |
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1.3 |
Last not least, C<$msg> might be a code reference, in which case it is |
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supposed to return the message. It will be called only then the message |
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actually gets logged, which is useful if it is costly to create the |
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message in the first place. |
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Whether the given message will be logged depends on the maximum log level |
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and the caller's package. |
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Note that you can (and should) call this function as C<AnyEvent::log> or |
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1.8 |
C<AE::log>, without C<use>-ing this module if possible (i.e. you don't |
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need any additional functionality), as those functions will load the |
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logging module on demand only. They are also much shorter to write. |
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1.11 |
Also, if you optionally generate a lot of debug messages (such as when |
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1.8 |
tracing some code), you should look into using a logger callback and a |
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boolean enabler (see C<logger>, below). |
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Example: log something at error level. |
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AE::log error => "something"; |
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Example: use printf-formatting. |
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AE::log info => "%5d %-10.10s %s", $index, $category, $msg; |
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Example: only generate a costly dump when the message is actually being logged. |
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AE::log debug => sub { require Data::Dump; Data::Dump::dump \%cache }; |
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1.2 |
=cut |
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# also allow syslog equivalent names |
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our %STR2LEVEL = ( |
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fatal => 1, emerg => 1, exit => 1, |
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1.2 |
alert => 2, |
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critical => 3, crit => 3, |
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error => 4, err => 4, die => 4, |
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warn => 5, warning => 5, |
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note => 6, notice => 6, |
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info => 7, |
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debug => 8, |
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trace => 9, |
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); |
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1.4 |
sub now () { time } |
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AnyEvent::post_detect { |
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*now = \&AE::now; |
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}; |
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our @LEVEL2STR = qw(0 fatal alert crit error warn note info debug trace); |
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# time, ctx, level, msg |
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sub _format($$$$) { |
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my $ts = ft $_[0]; |
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my $ct = " "; |
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my @res; |
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for (split /\n/, sprintf "%-5s %s: %s", $LEVEL2STR[$_[2]], $_[1][0], $_[3]) { |
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push @res, "$ts$ct$_\n"; |
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$ct = " + "; |
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} |
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join "", @res |
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} |
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sub _log { |
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my ($ctx, $level, $format, @args) = @_; |
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$level = $level > 0 && $level <= 9 |
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? $level+0 |
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: $STR2LEVEL{$level} || Carp::croak "$level: not a valid logging level, caught"; |
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my $mask = 1 << $level; |
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my (%seen, @ctx, $now, $fmt); |
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do |
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{ |
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# skip if masked |
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if ($ctx->[1] & $mask && !$seen{$ctx+0}++) { |
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if ($ctx->[3]) { |
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# logging target found |
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# now get raw message, unless we have it already |
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unless ($now) { |
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$format = $format->() if ref $format; |
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$format = sprintf $format, @args if @args; |
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$format =~ s/\n$//; |
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$now = AE::now; |
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}; |
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# format msg |
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my $str = $ctx->[4] |
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? $ctx->[4]($now, $_[0], $level, $format) |
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: ($fmt ||= _format $now, $_[0], $level, $format); |
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$ctx->[3]($str, $_[0], $level) |
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or push @ctx, values %{ $ctx->[2] }; # not consumed - propagate |
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} else { |
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push @ctx, values %{ $ctx->[2] }; # not masked - propagate |
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} |
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} |
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} |
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while $ctx = pop @ctx; |
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exit 1 if $level <= 1; |
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} |
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sub log($$;@) { |
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1.8 |
_log |
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$CTX{ (caller)[0] } ||= _pkg_ctx +(caller)[0], |
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@_; |
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1.3 |
} |
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*AnyEvent::log = *AE::log = \&log; |
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=item $logger = AnyEvent::Log::logger $level[, \$enabled] |
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Creates a code reference that, when called, acts as if the |
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C<AnyEvent::Log::log> function was called at this point with the givne |
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level. C<$logger> is passed a C<$msg> and optional C<@args>, just as with |
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the C<AnyEvent::Log::log> function: |
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my $debug_log = AnyEvent::Log::logger "debug"; |
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$debug_log->("debug here"); |
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$debug_log->("%06d emails processed", 12345); |
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$debug_log->(sub { $obj->as_string }); |
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The idea behind this function is to decide whether to log before actually |
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logging - when the C<logger> function is called once, but the returned |
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logger callback often, then this can be a tremendous speed win. |
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Despite this speed advantage, changes in logging configuration will |
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still be reflected by the logger callback, even if configuration changes |
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I<after> it was created. |
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To further speed up logging, you can bind a scalar variable to the logger, |
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which contains true if the logger should be called or not - if it is |
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false, calling the logger can be safely skipped. This variable will be |
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updated as long as C<$logger> is alive. |
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Full example: |
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# near the init section |
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use AnyEvent::Log; |
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my $debug_log = AnyEvent:Log::logger debug => \my $debug; |
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# and later in your program |
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$debug_log->("yo, stuff here") if $debug; |
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$debug and $debug_log->("123"); |
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=cut |
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our %LOGGER; |
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# re-assess logging status for all loggers |
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sub _reassess { |
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1.17 |
local $SIG{__DIE__}; |
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my $die = sub { die }; |
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1.3 |
for (@_ ? $LOGGER{$_[0]} : values %LOGGER) { |
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1.8 |
my ($ctx, $level, $renabled) = @$_; |
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1.3 |
|
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1.17 |
# to detect whether a message would be logged, we actually |
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1.11 |
# try to log one and die. this isn't fast, but we can be |
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1.3 |
# sure that the logging decision is correct :) |
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$$renabled = !eval { |
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1.17 |
_log $ctx, $level, $die; |
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1.3 |
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1 |
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}; |
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} |
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} |
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1.15 |
sub _logger { |
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1.8 |
my ($ctx, $level, $renabled) = @_; |
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1.3 |
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$$renabled = 1; |
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1.8 |
my $logger = [$ctx, $level, $renabled]; |
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1.3 |
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$LOGGER{$logger+0} = $logger; |
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_reassess $logger+0; |
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my $guard = AnyEvent::Util::guard { |
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# "clean up" |
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delete $LOGGER{$logger+0}; |
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}; |
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sub { |
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$guard if 0; # keep guard alive, but don't cause runtime overhead |
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1.8 |
_log $ctx, $level, @_ |
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1.3 |
if $$renabled; |
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} |
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} |
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1.8 |
sub logger($;$) { |
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_logger |
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$CTX{ (caller)[0] } ||= _pkg_ctx +(caller)[0], |
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@_ |
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} |
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1.2 |
=back |
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1.9 |
=head1 LOGGING CONTEXTS |
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1.2 |
|
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1.9 |
This module associates every log message with a so-called I<logging |
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context>, based on the package of the caller. Every perl package has its |
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own logging context. |
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1.8 |
|
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1.10 |
A logging context has three major responsibilities: filtering, logging and |
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propagating the message. |
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1.9 |
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1.10 |
For the first purpose, filtering, each context has a set of logging |
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levels, called the log level mask. Messages not in the set will be ignored |
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by this context (masked). |
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For logging, the context stores a formatting callback (which takes the |
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|
|
timestamp, context, level and string message and formats it in the way |
380 |
|
|
it should be logged) and a logging callback (which is responsible for |
381 |
|
|
actually logging the formatted message and telling C<AnyEvent::Log> |
382 |
|
|
whether it has consumed the message, or whether it should be propagated). |
383 |
root |
1.9 |
|
384 |
root |
1.18 |
For propagation, a context can have any number of attached I<slave |
385 |
root |
1.10 |
contexts>. Any message that is neither masked by the logging mask nor |
386 |
root |
1.18 |
masked by the logging callback returning true will be passed to all slave |
387 |
root |
1.10 |
contexts. |
388 |
root |
1.9 |
|
389 |
root |
1.11 |
Each call to a logging function will log the message at most once per |
390 |
|
|
context, so it does not matter (much) if there are cycles or if the |
391 |
|
|
message can arrive at the same context via multiple paths. |
392 |
|
|
|
393 |
root |
1.9 |
=head2 DEFAULTS |
394 |
|
|
|
395 |
root |
1.10 |
By default, all logging contexts have an full set of log levels ("all"), a |
396 |
root |
1.9 |
disabled logging callback and the default formatting callback. |
397 |
|
|
|
398 |
|
|
Package contexts have the package name as logging title by default. |
399 |
|
|
|
400 |
root |
1.18 |
They have exactly one slave - the context of the "parent" package. The |
401 |
root |
1.9 |
parent package is simply defined to be the package name without the last |
402 |
|
|
component, i.e. C<AnyEvent::Debug::Wrapped> becomes C<AnyEvent::Debug>, |
403 |
root |
1.18 |
and C<AnyEvent> becomes ... C<$AnyEvent::Log::COLLECT> which is the |
404 |
|
|
exception of the rule - just like the "parent" of any single-component |
405 |
|
|
package name in Perl is C<main>, the default slave of any top-level |
406 |
|
|
package context is C<$AnyEvent::Log::COLLECT>. |
407 |
root |
1.9 |
|
408 |
root |
1.18 |
Since perl packages form only an approximate hierarchy, this slave |
409 |
root |
1.9 |
context can of course be removed. |
410 |
|
|
|
411 |
root |
1.18 |
All other (anonymous) contexts have no slaves and an empty title by |
412 |
root |
1.9 |
default. |
413 |
|
|
|
414 |
root |
1.18 |
When the module is loaded it creates the C<$AnyEvent::Log::LOG> logging |
415 |
|
|
context that simply logs everything via C<warn>, without propagating |
416 |
|
|
anything anywhere by default. The purpose of this context is to provide |
417 |
root |
1.12 |
a convenient place to override the global logging target or to attach |
418 |
|
|
additional log targets. It's not meant for filtering. |
419 |
|
|
|
420 |
root |
1.18 |
It then creates the C<$AnyEvent::Log::FILTER> context whose |
421 |
|
|
purpose is to suppress all messages with priority higher |
422 |
|
|
than C<$ENV{PERL_ANYEVENT_VERBOSE}>. It then attached the |
423 |
|
|
C<$AnyEvent::Log::LOG> context to it. The purpose of the filter context |
424 |
|
|
is to simply provide filtering according to some global log level. |
425 |
|
|
|
426 |
|
|
Finally it creates the top-level package context C<$AnyEvent::Log::COLLECT> |
427 |
|
|
and attaches the C<$AnyEvent::Log::FILTER> context to it, but otherwise |
428 |
|
|
leaves it at default config. Its purpose is simply to collect all log |
429 |
|
|
messages system-wide. |
430 |
|
|
|
431 |
|
|
The hierarchy is then: |
432 |
|
|
|
433 |
|
|
any package, eventually -> $COLLECT -> $FILTER -> $LOG |
434 |
|
|
|
435 |
|
|
The effect of all this is that log messages, by default, wander up to the |
436 |
|
|
C<$AnyEvent::Log::COLLECT> context where all messages normally end up, |
437 |
|
|
from there to C<$AnyEvent::Log::FILTER> where log messages with lower |
438 |
|
|
priority then C<$ENV{PERL_ANYEVENT_VERBOSE}> will be filtered out and then |
439 |
|
|
to the C<$AnyEvent::Log::LOG> context to be passed to C<warn>. |
440 |
|
|
|
441 |
|
|
This makes it easy to set a global logging level (by modifying $FILTER), |
442 |
|
|
but still allow other contexts to send, for example, their debug and trace |
443 |
|
|
messages to the $LOG target despite the global logging level, or to attach |
444 |
|
|
additional log targets that log messages, regardless of the global logging |
445 |
|
|
level. |
446 |
|
|
|
447 |
|
|
It also makes it easy to modify the default warn-logger ($LOG) to |
448 |
|
|
something that logs to a file, or to attach additional logging targets |
449 |
|
|
(such as loggign to a file) by attaching it to $FILTER. |
450 |
root |
1.9 |
|
451 |
root |
1.11 |
=head2 CREATING/FINDING/DESTROYING CONTEXTS |
452 |
root |
1.2 |
|
453 |
|
|
=over 4 |
454 |
|
|
|
455 |
root |
1.8 |
=item $ctx = AnyEvent::Log::ctx [$pkg] |
456 |
|
|
|
457 |
root |
1.9 |
This function creates or returns a logging context (which is an object). |
458 |
root |
1.8 |
|
459 |
root |
1.9 |
If a package name is given, then the context for that packlage is |
460 |
|
|
returned. If it is called without any arguments, then the context for the |
461 |
|
|
callers package is returned (i.e. the same context as a C<AE::log> call |
462 |
|
|
would use). |
463 |
root |
1.8 |
|
464 |
|
|
If C<undef> is given, then it creates a new anonymous context that is not |
465 |
|
|
tied to any package and is destroyed when no longer referenced. |
466 |
|
|
|
467 |
|
|
=cut |
468 |
|
|
|
469 |
|
|
sub ctx(;$) { |
470 |
|
|
my $pkg = @_ ? shift : (caller)[0]; |
471 |
|
|
|
472 |
|
|
ref $pkg |
473 |
|
|
? $pkg |
474 |
|
|
: defined $pkg |
475 |
|
|
? $CTX{$pkg} ||= AnyEvent::Log::_pkg_ctx $pkg |
476 |
root |
1.10 |
: bless [undef, (1 << 10) - 1 - 1], "AnyEvent::Log::Ctx" |
477 |
root |
1.8 |
} |
478 |
|
|
|
479 |
root |
1.11 |
=item AnyEvent::Log::reset |
480 |
|
|
|
481 |
root |
1.16 |
Resets all package contexts and recreates the default hierarchy if |
482 |
|
|
necessary, i.e. resets the logging subsystem to defaults, as much as |
483 |
|
|
possible. This process keeps references to contexts held by other parts of |
484 |
|
|
the program intact. |
485 |
root |
1.11 |
|
486 |
|
|
This can be used to implement config-file (re-)loading: before loading a |
487 |
|
|
configuration, reset all contexts. |
488 |
|
|
|
489 |
|
|
=cut |
490 |
|
|
|
491 |
|
|
sub reset { |
492 |
root |
1.15 |
# hard to kill complex data structures |
493 |
root |
1.19 |
# we "recreate" all package loggers and reset the hierarchy |
494 |
root |
1.15 |
while (my ($k, $v) = each %CTX) { |
495 |
|
|
@$v = ($k, (1 << 10) - 1 - 1, { }); |
496 |
|
|
|
497 |
root |
1.19 |
$v->attach ($k =~ /^(.+)::/ ? $CTX{$1} : $AnyEvent::Log::COLLECT); |
498 |
root |
1.15 |
} |
499 |
root |
1.11 |
|
500 |
root |
1.19 |
@$_ = ($_->[0], (1 << 10) - 1 - 1) |
501 |
|
|
for $LOG, $FILTER, $COLLECT; |
502 |
|
|
|
503 |
root |
1.18 |
$LOG->slaves; |
504 |
|
|
$LOG->title ('$AnyEvent::Log::LOG'); |
505 |
|
|
$LOG->log_cb (sub { |
506 |
root |
1.15 |
warn shift; |
507 |
root |
1.8 |
0 |
508 |
|
|
}); |
509 |
root |
1.15 |
|
510 |
root |
1.18 |
$FILTER->slaves ($LOG); |
511 |
|
|
$FILTER->title ('$AnyEvent::Log::FILTER'); |
512 |
|
|
$FILTER->level ($AnyEvent::VERBOSE); |
513 |
|
|
|
514 |
|
|
$COLLECT->slaves ($FILTER); |
515 |
root |
1.19 |
$COLLECT->title ('$AnyEvent::Log::COLLECT'); |
516 |
root |
1.15 |
|
517 |
|
|
_reassess; |
518 |
root |
1.11 |
} |
519 |
|
|
|
520 |
root |
1.15 |
# create the default logger contexts |
521 |
root |
1.18 |
$LOG = ctx undef; |
522 |
|
|
$FILTER = ctx undef; |
523 |
|
|
$COLLECT = ctx undef; |
524 |
root |
1.15 |
|
525 |
root |
1.11 |
AnyEvent::Log::reset; |
526 |
|
|
|
527 |
root |
1.12 |
# hello, CPAN, please catch me |
528 |
root |
1.18 |
package AnyEvent::Log::LOG; |
529 |
|
|
package AE::Log::LOG; |
530 |
|
|
package AnyEvent::Log::FILTER; |
531 |
|
|
package AE::Log::FILTER; |
532 |
|
|
package AnyEvent::Log::COLLECT; |
533 |
|
|
package AE::Log::COLLECT; |
534 |
root |
1.8 |
|
535 |
root |
1.12 |
package AnyEvent::Log::Ctx; |
536 |
|
|
|
537 |
root |
1.18 |
# 0 1 2 3 4 |
538 |
|
|
# [$title, $level, %$slaves, &$logcb, &$fmtcb] |
539 |
root |
1.12 |
|
540 |
|
|
=item $ctx = new AnyEvent::Log::Ctx methodname => param... |
541 |
|
|
|
542 |
|
|
This is a convenience constructor that makes it simpler to construct |
543 |
|
|
anonymous logging contexts. |
544 |
|
|
|
545 |
|
|
Each key-value pair results in an invocation of the method of the same |
546 |
|
|
name as the key with the value as parameter, unless the value is an |
547 |
|
|
arrayref, in which case it calls the method with the contents of the |
548 |
|
|
array. The methods are called in the same order as specified. |
549 |
|
|
|
550 |
|
|
Example: create a new logging context and set both the default logging |
551 |
root |
1.18 |
level, some slave contexts and a logging callback. |
552 |
root |
1.12 |
|
553 |
|
|
$ctx = new AnyEvent::Log::Ctx |
554 |
|
|
title => "dubious messages", |
555 |
|
|
level => "error", |
556 |
|
|
log_cb => sub { print STDOUT shift; 0 }, |
557 |
root |
1.18 |
slaves => [$ctx1, $ctx, $ctx2], |
558 |
root |
1.12 |
; |
559 |
|
|
|
560 |
root |
1.9 |
=back |
561 |
|
|
|
562 |
|
|
=cut |
563 |
|
|
|
564 |
root |
1.12 |
sub new { |
565 |
|
|
my $class = shift; |
566 |
|
|
|
567 |
|
|
my $ctx = AnyEvent::Log::ctx undef; |
568 |
|
|
|
569 |
|
|
while (@_) { |
570 |
|
|
my ($k, $v) = splice @_, 0, 2; |
571 |
|
|
$ctx->$k (ref $v eq "ARRAY" ? @$v : $v); |
572 |
|
|
} |
573 |
|
|
|
574 |
|
|
bless $ctx, $class # do we really support subclassing, hmm? |
575 |
|
|
} |
576 |
root |
1.8 |
|
577 |
|
|
|
578 |
root |
1.9 |
=head2 CONFIGURING A LOG CONTEXT |
579 |
|
|
|
580 |
|
|
The following methods can be used to configure the logging context. |
581 |
|
|
|
582 |
|
|
=over 4 |
583 |
|
|
|
584 |
root |
1.8 |
=item $ctx->title ([$new_title]) |
585 |
|
|
|
586 |
|
|
Returns the title of the logging context - this is the package name, for |
587 |
|
|
package contexts, and a user defined string for all others. |
588 |
|
|
|
589 |
|
|
If C<$new_title> is given, then it replaces the package name or title. |
590 |
|
|
|
591 |
|
|
=cut |
592 |
|
|
|
593 |
|
|
sub title { |
594 |
|
|
$_[0][0] = $_[1] if @_ > 1; |
595 |
|
|
$_[0][0] |
596 |
|
|
} |
597 |
|
|
|
598 |
root |
1.9 |
=back |
599 |
|
|
|
600 |
|
|
=head3 LOGGING LEVELS |
601 |
|
|
|
602 |
root |
1.10 |
The following methods deal with the logging level set associated with the |
603 |
|
|
log context. |
604 |
root |
1.9 |
|
605 |
|
|
The most common method to use is probably C<< $ctx->level ($level) >>, |
606 |
|
|
which configures the specified and any higher priority levels. |
607 |
|
|
|
608 |
root |
1.10 |
All functions which accept a list of levels also accept the special string |
609 |
|
|
C<all> which expands to all logging levels. |
610 |
|
|
|
611 |
root |
1.9 |
=over 4 |
612 |
|
|
|
613 |
root |
1.8 |
=item $ctx->levels ($level[, $level...) |
614 |
|
|
|
615 |
root |
1.10 |
Enables logging for the given levels and disables it for all others. |
616 |
root |
1.8 |
|
617 |
|
|
=item $ctx->level ($level) |
618 |
|
|
|
619 |
|
|
Enables logging for the given level and all lower level (higher priority) |
620 |
root |
1.10 |
ones. In addition to normal logging levels, specifying a level of C<0> or |
621 |
|
|
C<off> disables all logging for this level. |
622 |
root |
1.8 |
|
623 |
|
|
Example: log warnings, errors and higher priority messages. |
624 |
|
|
|
625 |
|
|
$ctx->level ("warn"); |
626 |
|
|
$ctx->level (5); # same thing, just numeric |
627 |
|
|
|
628 |
|
|
=item $ctx->enable ($level[, $level...]) |
629 |
|
|
|
630 |
|
|
Enables logging for the given levels, leaving all others unchanged. |
631 |
root |
1.5 |
|
632 |
root |
1.8 |
=item $ctx->disable ($level[, $level...]) |
633 |
|
|
|
634 |
|
|
Disables logging for the given levels, leaving all others unchanged. |
635 |
|
|
|
636 |
|
|
=cut |
637 |
|
|
|
638 |
|
|
sub _lvl_lst { |
639 |
root |
1.10 |
map { |
640 |
|
|
$_ > 0 && $_ <= 9 ? $_+0 |
641 |
|
|
: $_ eq "all" ? (1 .. 9) |
642 |
|
|
: $STR2LEVEL{$_} || Carp::croak "$_: not a valid logging level, caught" |
643 |
|
|
} @_ |
644 |
root |
1.8 |
} |
645 |
|
|
|
646 |
|
|
our $NOP_CB = sub { 0 }; |
647 |
|
|
|
648 |
|
|
sub levels { |
649 |
|
|
my $ctx = shift; |
650 |
|
|
$ctx->[1] = 0; |
651 |
|
|
$ctx->[1] |= 1 << $_ |
652 |
|
|
for &_lvl_lst; |
653 |
|
|
AnyEvent::Log::_reassess; |
654 |
|
|
} |
655 |
|
|
|
656 |
|
|
sub level { |
657 |
|
|
my $ctx = shift; |
658 |
root |
1.10 |
my $lvl = $_[0] =~ /^(?:0|off|none)$/ ? 0 : (_lvl_lst $_[0])[-1]; |
659 |
|
|
|
660 |
root |
1.8 |
$ctx->[1] = ((1 << $lvl) - 1) << 1; |
661 |
|
|
AnyEvent::Log::_reassess; |
662 |
|
|
} |
663 |
|
|
|
664 |
|
|
sub enable { |
665 |
|
|
my $ctx = shift; |
666 |
|
|
$ctx->[1] |= 1 << $_ |
667 |
|
|
for &_lvl_lst; |
668 |
|
|
AnyEvent::Log::_reassess; |
669 |
|
|
} |
670 |
|
|
|
671 |
|
|
sub disable { |
672 |
|
|
my $ctx = shift; |
673 |
|
|
$ctx->[1] &= ~(1 << $_) |
674 |
|
|
for &_lvl_lst; |
675 |
|
|
AnyEvent::Log::_reassess; |
676 |
|
|
} |
677 |
|
|
|
678 |
root |
1.9 |
=back |
679 |
|
|
|
680 |
root |
1.18 |
=head3 SLAVE CONTEXTS |
681 |
root |
1.9 |
|
682 |
|
|
The following methods attach and detach another logging context to a |
683 |
|
|
logging context. |
684 |
|
|
|
685 |
root |
1.18 |
Log messages are propagated to all slave contexts, unless the logging |
686 |
root |
1.9 |
callback consumes the message. |
687 |
|
|
|
688 |
|
|
=over 4 |
689 |
|
|
|
690 |
root |
1.8 |
=item $ctx->attach ($ctx2[, $ctx3...]) |
691 |
|
|
|
692 |
root |
1.18 |
Attaches the given contexts as slaves to this context. It is not an error |
693 |
root |
1.8 |
to add a context twice (the second add will be ignored). |
694 |
|
|
|
695 |
|
|
A context can be specified either as package name or as a context object. |
696 |
|
|
|
697 |
|
|
=item $ctx->detach ($ctx2[, $ctx3...]) |
698 |
|
|
|
699 |
root |
1.18 |
Removes the given slaves from this context - it's not an error to attempt |
700 |
root |
1.8 |
to remove a context that hasn't been added. |
701 |
|
|
|
702 |
|
|
A context can be specified either as package name or as a context object. |
703 |
root |
1.5 |
|
704 |
root |
1.18 |
=item $ctx->slaves ($ctx2[, $ctx3...]) |
705 |
root |
1.11 |
|
706 |
root |
1.18 |
Replaces all slaves attached to this context by the ones given. |
707 |
root |
1.11 |
|
708 |
root |
1.2 |
=cut |
709 |
|
|
|
710 |
root |
1.8 |
sub attach { |
711 |
|
|
my $ctx = shift; |
712 |
|
|
|
713 |
|
|
$ctx->[2]{$_+0} = $_ |
714 |
|
|
for map { AnyEvent::Log::ctx $_ } @_; |
715 |
|
|
} |
716 |
|
|
|
717 |
|
|
sub detach { |
718 |
|
|
my $ctx = shift; |
719 |
|
|
|
720 |
|
|
delete $ctx->[2]{$_+0} |
721 |
|
|
for map { AnyEvent::Log::ctx $_ } @_; |
722 |
|
|
} |
723 |
|
|
|
724 |
root |
1.18 |
sub slaves { |
725 |
root |
1.11 |
undef $_[0][2]; |
726 |
|
|
&attach; |
727 |
|
|
} |
728 |
|
|
|
729 |
root |
1.9 |
=back |
730 |
|
|
|
731 |
root |
1.18 |
=head3 LOG TARGETS |
732 |
root |
1.9 |
|
733 |
|
|
The following methods configure how the logging context actually does |
734 |
root |
1.10 |
the logging (which consists of formatting the message and printing it or |
735 |
root |
1.18 |
whatever it wants to do with it). |
736 |
root |
1.9 |
|
737 |
|
|
=over 4 |
738 |
|
|
|
739 |
root |
1.20 |
=item $ctx->log_cb ($cb->($str, $orig_ctx, $level)) |
740 |
root |
1.5 |
|
741 |
root |
1.8 |
Replaces the logging callback on the context (C<undef> disables the |
742 |
|
|
logging callback). |
743 |
root |
1.5 |
|
744 |
root |
1.8 |
The logging callback is responsible for handling formatted log messages |
745 |
|
|
(see C<fmt_cb> below) - normally simple text strings that end with a |
746 |
root |
1.20 |
newline (and are possibly multiline themselves). In addition to the |
747 |
|
|
message, which is often the only argument you need to look at, it is |
748 |
|
|
passed the numeric log level and originating context. |
749 |
root |
1.8 |
|
750 |
|
|
It also has to return true iff it has consumed the log message, and false |
751 |
|
|
if it hasn't. Consuming a message means that it will not be sent to any |
752 |
root |
1.18 |
slave context. When in doubt, return C<0> from your logging callback. |
753 |
root |
1.8 |
|
754 |
|
|
Example: a very simple logging callback, simply dump the message to STDOUT |
755 |
|
|
and do not consume it. |
756 |
|
|
|
757 |
|
|
$ctx->log_cb (sub { print STDERR shift; 0 }); |
758 |
|
|
|
759 |
root |
1.10 |
You can filter messages by having a log callback that simply returns C<1> |
760 |
|
|
and does not do anything with the message, but this counts as "message |
761 |
|
|
being logged" and might not be very efficient. |
762 |
|
|
|
763 |
|
|
Example: propagate all messages except for log levels "debug" and |
764 |
|
|
"trace". The messages will still be generated, though, which can slow down |
765 |
|
|
your program. |
766 |
|
|
|
767 |
|
|
$ctx->levels ("debug", "trace"); |
768 |
|
|
$ctx->log_cb (sub { 1 }); # do not log, but eat debug and trace messages |
769 |
|
|
|
770 |
root |
1.18 |
=item $ctx->log_to_file ($path) |
771 |
|
|
|
772 |
|
|
Sets the C<log_cb> to log to a file (by appending), unbuffered. |
773 |
|
|
|
774 |
|
|
=item $ctx->log_to_path ($path) |
775 |
|
|
|
776 |
|
|
Same as C<< ->log_to_file >>, but opens the file for each message. This |
777 |
|
|
is much slower, but allows you to change/move/rename/delete the file at |
778 |
|
|
basically any time. |
779 |
|
|
|
780 |
root |
1.20 |
=item $ctx->log_to_syslog ([$log_flags]) |
781 |
|
|
|
782 |
|
|
Logs all messages via L<Sys::Syslog>, mapping C<trace> to C<debug> and all |
783 |
|
|
the others in the obvious way. If specified, then the C<$log_flags> are |
784 |
|
|
simply or'ed onto the priority argument and can contain any C<LOG_xxx> |
785 |
|
|
flags valid for Sys::Syslog::syslog, except for the priority levels. |
786 |
|
|
|
787 |
|
|
Note that the default logging format includes a verbose timestamp, which |
788 |
|
|
is not so suited for syslog, so a simpler C<fmt_cb> might be useful: |
789 |
|
|
|
790 |
|
|
$ctx->log_to_syslog; |
791 |
|
|
$ctx->fmt_cb (sub { "($_[1][0]) $_[3]" }); |
792 |
|
|
|
793 |
|
|
=item $ctx->fmt_cb ($fmt_cb->($timestamp, $orig_ctx, $level, $message)) |
794 |
root |
1.8 |
|
795 |
root |
1.10 |
Replaces the formatting callback on the context (C<undef> restores the |
796 |
root |
1.8 |
default formatter). |
797 |
|
|
|
798 |
|
|
The callback is passed the (possibly fractional) timestamp, the original |
799 |
root |
1.18 |
logging context, the (numeric) logging level and the raw message string |
800 |
|
|
and needs to return a formatted log message. In most cases this will be a |
801 |
|
|
string, but it could just as well be an array reference that just stores |
802 |
|
|
the values. |
803 |
|
|
|
804 |
|
|
If, for some reaosn, you want to use C<caller> to find out more baout the |
805 |
|
|
logger then you should walk up the call stack until you are no longer |
806 |
|
|
inside the C<AnyEvent::Log> package. |
807 |
root |
1.8 |
|
808 |
|
|
Example: format just the raw message, with numeric log level in angle |
809 |
|
|
brackets. |
810 |
|
|
|
811 |
|
|
$ctx->fmt_cb (sub { |
812 |
|
|
my ($time, $ctx, $lvl, $msg) = @_; |
813 |
|
|
|
814 |
|
|
"<$lvl>$msg\n" |
815 |
|
|
}); |
816 |
|
|
|
817 |
|
|
Example: return an array reference with just the log values, and use |
818 |
|
|
C<PApp::SQL::sql_exec> to store the emssage in a database. |
819 |
|
|
|
820 |
|
|
$ctx->fmt_cb (sub { \@_ }); |
821 |
|
|
$ctx->log_cb (sub { |
822 |
|
|
my ($msg) = @_; |
823 |
|
|
|
824 |
|
|
sql_exec "insert into log (when, subsys, prio, msg) values (?, ?, ?, ?)", |
825 |
|
|
$msg->[0] + 0, |
826 |
|
|
"$msg->[1]", |
827 |
|
|
$msg->[2] + 0, |
828 |
|
|
"$msg->[3]"; |
829 |
|
|
|
830 |
|
|
0 |
831 |
|
|
}); |
832 |
|
|
|
833 |
|
|
=cut |
834 |
|
|
|
835 |
|
|
sub log_cb { |
836 |
|
|
my ($ctx, $cb) = @_; |
837 |
root |
1.6 |
|
838 |
root |
1.10 |
$ctx->[3] = $cb; |
839 |
root |
1.6 |
} |
840 |
root |
1.5 |
|
841 |
root |
1.8 |
sub fmt_cb { |
842 |
|
|
my ($ctx, $cb) = @_; |
843 |
root |
1.6 |
|
844 |
root |
1.8 |
$ctx->[4] = $cb; |
845 |
root |
1.5 |
} |
846 |
|
|
|
847 |
root |
1.18 |
sub log_to_file { |
848 |
|
|
my ($ctx, $path) = @_; |
849 |
|
|
|
850 |
|
|
open my $fh, ">>", $path |
851 |
|
|
or die "$path: $!"; |
852 |
|
|
|
853 |
|
|
$ctx->log_cb (sub { |
854 |
|
|
syswrite $fh, shift; |
855 |
|
|
0 |
856 |
|
|
}); |
857 |
|
|
} |
858 |
|
|
|
859 |
|
|
sub log_to_file { |
860 |
|
|
my ($ctx, $path) = @_; |
861 |
|
|
|
862 |
|
|
$ctx->log_cb (sub { |
863 |
|
|
open my $fh, ">>", $path |
864 |
|
|
or die "$path: $!"; |
865 |
|
|
|
866 |
|
|
syswrite $fh, shift; |
867 |
|
|
0 |
868 |
|
|
}); |
869 |
|
|
} |
870 |
|
|
|
871 |
root |
1.20 |
sub log_to_syslog { |
872 |
|
|
my ($ctx, $flags) = @_; |
873 |
|
|
|
874 |
|
|
require Sys::Syslog; |
875 |
|
|
|
876 |
|
|
$ctx->log_cb (sub { |
877 |
|
|
my $lvl = $_[2] < 9 ? $_[2] : 8; |
878 |
|
|
|
879 |
|
|
Sys::Syslog::syslog ($flags | ($lvl - 1), $_) |
880 |
|
|
for split /\n/, shift; |
881 |
|
|
|
882 |
|
|
0 |
883 |
|
|
}); |
884 |
|
|
} |
885 |
|
|
|
886 |
root |
1.18 |
=back |
887 |
|
|
|
888 |
|
|
=head3 MESSAGE LOGGING |
889 |
|
|
|
890 |
|
|
These methods allow you to log messages directly to a context, without |
891 |
|
|
going via your package context. |
892 |
|
|
|
893 |
|
|
=over 4 |
894 |
|
|
|
895 |
root |
1.8 |
=item $ctx->log ($level, $msg[, @params]) |
896 |
|
|
|
897 |
|
|
Same as C<AnyEvent::Log::log>, but uses the given context as log context. |
898 |
|
|
|
899 |
|
|
=item $logger = $ctx->logger ($level[, \$enabled]) |
900 |
|
|
|
901 |
|
|
Same as C<AnyEvent::Log::logger>, but uses the given context as log |
902 |
|
|
context. |
903 |
|
|
|
904 |
|
|
=cut |
905 |
|
|
|
906 |
|
|
*log = \&AnyEvent::Log::_log; |
907 |
|
|
*logger = \&AnyEvent::Log::_logger; |
908 |
|
|
|
909 |
root |
1.1 |
1; |
910 |
|
|
|
911 |
|
|
=back |
912 |
|
|
|
913 |
root |
1.12 |
=head1 EXAMPLES |
914 |
|
|
|
915 |
|
|
This section shows some common configurations. |
916 |
|
|
|
917 |
|
|
=over 4 |
918 |
|
|
|
919 |
|
|
=item Setting the global logging level. |
920 |
|
|
|
921 |
|
|
Either put PERL_ANYEVENT_VERBOSE=<number> into your environment before |
922 |
|
|
running your program, or modify the log level of the root context: |
923 |
|
|
|
924 |
|
|
PERL_ANYEVENT_VERBOSE=5 ./myprog |
925 |
|
|
|
926 |
root |
1.18 |
$AnyEvent::Log::FILTER->level ("warn"); |
927 |
root |
1.12 |
|
928 |
|
|
=item Append all messages to a file instead of sending them to STDERR. |
929 |
|
|
|
930 |
|
|
This is affected by the global logging level. |
931 |
|
|
|
932 |
root |
1.18 |
$AnyEvent::Log::LOG->log_to_file ($path); (sub { |
933 |
root |
1.12 |
|
934 |
|
|
=item Write all messages with priority C<error> and higher to a file. |
935 |
|
|
|
936 |
|
|
This writes them only when the global logging level allows it, because |
937 |
|
|
it is attached to the default context which is invoked I<after> global |
938 |
|
|
filtering. |
939 |
|
|
|
940 |
root |
1.18 |
$AnyEvent::Log::FILTER->attach |
941 |
|
|
new AnyEvent::Log::Ctx log_to_file => $path); |
942 |
root |
1.12 |
|
943 |
|
|
This writes them regardless of the global logging level, because it is |
944 |
|
|
attached to the toplevel context, which receives all messages I<before> |
945 |
|
|
the global filtering. |
946 |
|
|
|
947 |
root |
1.18 |
$AnyEvent::Log::COLLECT->attach ( |
948 |
|
|
new AnyEvent::Log::Ctx log_to_file => $path); |
949 |
root |
1.12 |
|
950 |
root |
1.18 |
In both cases, messages are still written to STDERR. |
951 |
root |
1.12 |
|
952 |
|
|
=item Write trace messages (only) from L<AnyEvent::Debug> to the default logging target(s). |
953 |
|
|
|
954 |
root |
1.18 |
Attach the C<$AnyEvent::Log::LOG> context to the C<AnyEvent::Debug> |
955 |
|
|
context - this simply circumvents the global filtering for trace messages. |
956 |
root |
1.12 |
|
957 |
|
|
my $debug = AnyEvent::Debug->AnyEvent::Log::ctx; |
958 |
root |
1.18 |
$debug->attach ($AnyEvent::Log::LOG); |
959 |
root |
1.12 |
|
960 |
root |
1.18 |
This of course works for any package, not just L<AnyEvent::Debug>, but |
961 |
|
|
assumes the log level for AnyEvent::Debug hasn't been changed from the |
962 |
|
|
default. |
963 |
root |
1.13 |
|
964 |
root |
1.12 |
=back |
965 |
|
|
|
966 |
root |
1.1 |
=head1 AUTHOR |
967 |
|
|
|
968 |
|
|
Marc Lehmann <schmorp@schmorp.de> |
969 |
|
|
http://home.schmorp.de/ |
970 |
|
|
|
971 |
|
|
=cut |