/usr/share/perl5/Mojo/Log.pm is in libmojolicious-perl 2.23-1.
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 IO::File;
has handle => sub {
my $self = shift;
# Need a log file
unless ($self->path) {
binmode STDERR, ':utf8';
return \*STDERR;
}
# Append to file
my $path = $self->path;
croak qq/Can't open log file "$path": $!/
unless my $file = IO::File->new(">> $path");
binmode $file, ':utf8';
return $file;
};
has level => 'debug';
has 'path';
# Supported log level
my $LEVEL = {debug => 1, info => 2, warn => 3, error => 4, fatal => 5};
sub new {
my $self = shift->SUPER::new(@_);
$self->on(
message => sub {
my $self = shift;
return unless my $handle = $self->handle;
flock $handle, LOCK_EX;
$handle->syswrite($self->format(@_));
flock $handle, LOCK_UN;
}
);
return $self;
}
# "Yes, I got the most! I win X-Mas!"
sub debug { shift->log('debug', @_) }
sub error { shift->log('error', @_) }
sub fatal { shift->log('fatal', @_) }
sub format {
my ($self, $level, @msgs) = @_;
my $msgs = join "\n", @msgs;
return '[' . localtime(time) . "] [$level] $msgs\n";
}
sub info { shift->log('info', @_) }
sub is_debug { shift->is_level('debug') }
sub is_error { shift->is_level('error') }
sub is_fatal { shift->is_level('fatal') }
sub is_info { shift->is_level('info') }
sub is_level {
my ($self, $level) = @_;
return unless $level;
$level = lc $level;
my $current = $ENV{MOJO_LOG_LEVEL} || $self->level;
return $LEVEL->{$level} >= $LEVEL->{$current};
}
sub is_warn { shift->is_level('warn') }
# "If The Flintstones has taught us anything,
# it's that pelicans can be used to mix cement."
sub log {
my $self = shift;
my $level = lc shift;
return $self unless $level && $self->is_level($level);
$self->emit(message => $level => @_);
return $self;
}
sub warn { shift->log('warn', @_) }
1;
__END__
=head1 NAME
Mojo::Log - Simple logger for Mojo
=head1 SYNOPSIS
use Mojo::Log;
# Create a logging object that will log to STDERR by default
my $log = Mojo::Log->new;
# Customize the log location and minimum log level
my $log = Mojo::Log->new(
path => '/var/log/mojo.log',
level => 'warn',
);
# Log messages
$log->debug("Why isn't this 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> can emit the following events.
=head2 C<message>
$log->on(message => sub {
my ($log, $level, @messages) = @_;
});
Emitted when a new message gets logged.
Note that this event is EXPERIMENTAL and might change without warning!
$log->unsubscribe('message');
$log->on(message => sub {
my ($log, $level, @messages) = @_;
say "$level: ", @messages;
});
=head1 ATTRIBUTES
L<Mojo::Log> implements the following attributes.
=head2 C<handle>
my $handle = $log->handle;
$log = $log->handle(IO::File->new);
Logfile handle used by default C<message> event, defaults to opening the
value of C<path> or C<STDERR>.
=head2 C<level>
my $level = $log->level;
$log = $log->level('debug');
Active log level, defaults to C<debug>.
These levels are currently available:
=over 2
=item C<debug>
=item C<info>
=item C<warn>
=item C<error>
=item C<fatal>
=back
=head2 C<path>
my $path = $log->path
$log = $log->path('/var/log/mojo.log');
Logfile path used by C<handle>.
=head1 METHODS
L<Mojo::Log> inherits all methods from L<Mojo::EventEmitter> and implements
the following new ones.
=head2 C<new>
my $log = Mojo::Log->new;
Construct a new L<Mojo::Log> object and register default C<message> event.
=head2 C<debug>
$log = $log->debug('You screwed up, but that is ok');
Log debug message.
=head2 C<error>
$log = $log->error('You really screwed up this time');
Log error message.
=head2 C<fatal>
$log = $log->fatal('Its over...');
Log fatal message.
=head2 C<format>
my $message = $log->format('debug', 'Hi there!');
my $message = $log->format('debug', 'Hi', 'there!');
Format log message.
=head2 C<info>
$log = $log->info('You are bad, but you prolly know already');
Log info message.
=head2 C<is_level>
my $success = $log->is_level('debug');
Check log level.
=head2 C<is_debug>
my $success = $log->is_debug;
Check for debug log level.
=head2 C<is_error>
my $success = $log->is_error;
Check for error log level.
=head2 C<is_fatal>
my $success = $log->is_fatal;
Check for fatal log level.
=head2 C<is_info>
my $success = $log->is_info;
Check for info log level.
=head2 C<is_warn>
my $success = $log->is_warn;
Check for warn log level.
=head2 C<log>
$log = $log->log(debug => 'This should work');
Emit C<message> event.
=head2 C<warn>
$log = $log->warn('Dont do that Dave...');
Log warn message.
=head1 SEE ALSO
L<Mojolicious>, L<Mojolicious::Guides>, L<http://mojolicio.us>.
=cut
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