/usr/share/perl5/Mojo/Log.pm is in libmojolicious-perl 5.54+dfsg-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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use Mojo::Base 'Mojo::EventEmitter';
use Carp 'croak';
use Fcntl ':flock';
use Mojo::Util 'encode';
has format => sub { \&_format };
has handle => sub {
# STDERR
return \*STDERR unless my $path = shift->path;
# File
croak qq{Can't open log file "$path": $!} unless open my $file, '>>', $path;
return $file;
};
has history => sub { [] };
has level => 'debug';
has max_history_size => 10;
has 'path';
# Supported log level
my $LEVEL = {debug => 1, info => 2, warn => 3, error => 4, fatal => 5};
sub append {
my ($self, $msg) = @_;
return unless my $handle = $self->handle;
flock $handle, LOCK_EX;
$handle->print(encode('UTF-8', $msg)) or croak "Can't write to log: $!";
flock $handle, LOCK_UN;
}
sub debug { shift->log(debug => @_) }
sub error { shift->log(error => @_) }
sub fatal { shift->log(fatal => @_) }
sub info { shift->log(info => @_) }
sub is_debug { shift->is_level('debug') }
sub is_error { shift->is_level('error') }
sub is_fatal { shift->is_level('fatal') }
sub is_info { shift->is_level('info') }
sub is_level {
$LEVEL->{lc pop} >= $LEVEL->{$ENV{MOJO_LOG_LEVEL} || shift->level};
}
sub is_warn { shift->is_level('warn') }
sub log { shift->emit('message', lc shift, @_) }
sub new {
my $self = shift->SUPER::new(@_);
$self->on(message => \&_message);
return $self;
}
sub warn { shift->log(warn => @_) }
sub _format {
'[' . localtime(shift) . '] [' . shift() . '] ' . join("\n", @_, '');
}
sub _message {
my ($self, $level) = (shift, shift);
return unless $self->is_level($level);
my $max = $self->max_history_size;
my $history = $self->history;
push @$history, my $msg = [time, $level, @_];
shift @$history while @$history > $max;
$self->append($self->format->(@$msg));
}
1;
=encoding utf8
=head1 NAME
Mojo::Log - Simple logger
=head1 SYNOPSIS
use Mojo::Log;
# Log to STDERR
my $log = Mojo::Log->new;
# Customize log file location and minimum log level
my $log = Mojo::Log->new(path => '/var/log/mojo.log', level => 'warn');
# Log messages
$log->debug('Why is this not working?');
$log->info('FYI: it happened again.');
$log->warn('This might be a problem.');
$log->error('Garden variety error.');
$log->fatal('Boom!');
=head1 DESCRIPTION
L<Mojo::Log> is a simple logger for L<Mojo> projects.
=head1 EVENTS
L<Mojo::Log> inherits all events from L<Mojo::EventEmitter> and can emit the
following new ones.
=head2 message
$log->on(message => sub {
my ($log, $level, @lines) = @_;
...
});
Emitted when a new message gets logged.
$log->unsubscribe('message');
$log->on(message => sub {
my ($log, $level, @lines) = @_;
say "$level: ", @lines;
});
=head1 ATTRIBUTES
L<Mojo::Log> implements the following attributes.
=head2 format
my $cb = $log->format;
$log = $log->format(sub {...});
A callback for formatting log messages.
$log->format(sub {
my ($time, $level, @lines) = @_;
return "[Thu May 15 17:47:04 2014] [info] I ♥ Mojolicious.\n";
});
=head2 handle
my $handle = $log->handle;
$log = $log->handle(IO::Handle->new);
Log filehandle used by default L</"message"> event, defaults to opening
L</"path"> or C<STDERR>.
=head2 history
my $history = $log->history;
$log = $log->history([[time, 'debug', 'That went wrong.']]);
The last few logged messages.
=head2 level
my $level = $log->level;
$log = $log->level('debug');
Active log level, defaults to C<debug>. Available log levels are C<debug>,
C<info>, C<warn>, C<error> and C<fatal>, in that order. Note that the
C<MOJO_LOG_LEVEL> environment variable can override this value.
=head2 max_history_size
my $size = $log->max_history_size;
$log = $log->max_history_size(5);
Maximum number of logged messages to store in L</"history">, defaults to
C<10>.
=head2 path
my $path = $log->path
$log = $log->path('/var/log/mojo.log');
Log file path used by L</"handle">.
=head1 METHODS
L<Mojo::Log> inherits all methods from L<Mojo::EventEmitter> and implements
the following new ones.
=head2 append
$log->append("[Thu May 15 17:47:04 2014] [info] I ♥ Mojolicious.\n");
Append message to L</"handle">.
=head2 debug
$log = $log->debug('You screwed up, but that is ok.');
$log = $log->debug('All', 'cool!');
Log debug message.
=head2 error
$log = $log->error('You really screwed up this time.');
$log = $log->error('Wow', 'seriously!');
Log error message.
=head2 fatal
$log = $log->fatal('Its over...');
$log = $log->fatal('Bye', 'bye!');
Log fatal message.
=head2 info
$log = $log->info('You are bad, but you prolly know already.');
$log = $log->info('Ok', 'then!');
Log info message.
=head2 is_level
my $bool = $log->is_level('debug');
Check log level.
=head2 is_debug
my $bool = $log->is_debug;
Check for debug log level.
=head2 is_error
my $bool = $log->is_error;
Check for error log level.
=head2 is_fatal
my $bool = $log->is_fatal;
Check for fatal log level.
=head2 is_info
my $bool = $log->is_info;
Check for info log level.
=head2 is_warn
my $bool = $log->is_warn;
Check for warn log level.
=head2 log
$log = $log->log(debug => 'This should work.');
$log = $log->log(debug => 'This', 'too!');
Emit L</"message"> event.
=head2 new
my $log = Mojo::Log->new;
Construct a new L<Mojo::Log> object and subscribe to L</"message"> event with
default logger.
=head2 warn
$log = $log->warn('Dont do that Dave...');
$log = $log->warn('No', 'really!');
Log warn message.
=head1 SEE ALSO
L<Mojolicious>, L<Mojolicious::Guides>, L<http://mojolicio.us>.
=cut
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