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package Catalyst::Log;
use Moose;
with 'MooseX::Emulate::Class::Accessor::Fast';
use Data::Dump;
use Class::MOP ();
use Carp qw/ cluck /;
our %LEVELS = (); # Levels stored as bit field, ergo debug = 1, warn = 2 etc
our %LEVEL_MATCH = (); # Stored as additive, thus debug = 31, warn = 30 etc
has level => (is => 'rw');
has _body => (is => 'rw');
has abort => (is => 'rw');
{
    my @levels = qw[ debug info warn error fatal ];
    my $meta = Class::MOP::get_metaclass_by_name(__PACKAGE__);
    my $summed_level = 0;
    for ( my $i = $#levels ; $i >= 0 ; $i-- ) {
        my $name  = $levels[$i];
        my $level = 1 << $i;
        $summed_level |= $level;
        $LEVELS{$name} = $level;
        $LEVEL_MATCH{$name} = $summed_level;
       $meta->add_method($name, sub {
            my $self = shift;
            if ( $self->level & $level ) {
                $self->_log( $name, @_ );
            }
        });
        $meta->add_method("is_$name", sub {
            my $self = shift;
            return $self->level & $level;
        });;
    }
}
around new => sub {
    my $orig = shift;
    my $class = shift;
    my $self = $class->$orig;
    $self->levels( scalar(@_) ? @_ : keys %LEVELS );
    return $self;
};
sub levels {
    my ( $self, @levels ) = @_;
    $self->level(0);
    $self->enable(@levels);
}
sub enable {
    my ( $self, @levels ) = @_;
    my $level = $self->level;
    for(map { $LEVEL_MATCH{$_} } @levels){
      $level |= $_;
    }
    $self->level($level);
}
sub disable {
    my ( $self, @levels ) = @_;
    my $level = $self->level;
    for(map { $LEVELS{$_} } @levels){
      $level &= ~$_;
    }
    $self->level($level);
}
our $HAS_DUMPED;
sub _dump {
    my $self = shift;
    unless ($HAS_DUMPED++) {
        cluck("Catalyst::Log::_dump is deprecated and will be removed. Please change to using your own Dumper.\n");
    }
    $self->info( Data::Dump::dump(@_) );
}
sub _log {
    my $self    = shift;
    my $level   = shift;
    my $message = join( "\n", @_ );
    $message .= "\n" unless $message =~ /\n$/;
    my $body = $self->_body;
    $body .= sprintf( "[%s] %s", $level, $message );
    $self->_body($body);
}
sub _flush {
    my $self = shift;
    if ( $self->abort || !$self->_body ) {
        $self->abort(undef);
    }
    else {
        $self->_send_to_log( $self->_body );
    }
    $self->_body(undef);
}
sub _send_to_log {
    my $self = shift;
    print STDERR @_;
}
# 5.7 compat code.
# Alias _body to body, add a before modifier to warn..
my $meta = __PACKAGE__->meta; # Calling meta method here fine as we happen at compile time.
$meta->add_method('body', $meta->get_method('_body'));
my %package_hash; # Only warn once per method, per package.
                  # I haven't provided a way to disable them, patches welcome.
$meta->add_before_method_modifier('body', sub {
    my $class = blessed(shift);
    $package_hash{$class}++ || do {
        warn("Class $class is calling the deprecated method Catalyst::Log->body method,\n"
            . "this will be removed in Catalyst 5.81");
    };
});
# End 5.70 backwards compatibility hacks.
no Moose;
__PACKAGE__->meta->make_immutable(inline_constructor => 0);
1;
__END__
HideShow 145 lines of Pod
=head1 NAME
Catalyst::Log - Catalyst Log Class
=head1 SYNOPSIS
    $log = $c->log;
    $log->debug($message);
    $log->info($message);
    $log->warn($message);
    $log->error($message);
    $log->fatal($message);
    if ( $log->is_debug ) {
         # expensive debugging
    }
See L<Catalyst>.
=head1 DESCRIPTION
This module provides the default, simple logging functionality for Catalyst.
If you want something different set C<< $c->log >> in your application module,
e.g.:
    $c->log( MyLogger->new );
Your logging object is expected to provide the interface described here.
Good alternatives to consider are Log::Log4Perl and Log::Dispatch.
If you want to be able to log arbitrary warnings, you can do something along
the lines of
    $SIG{__WARN__} = sub { MyApp->log->warn(@_); };
however this is (a) global, (b) hairy and (c) may have unexpected side effects.
Don't say we didn't warn you.
=head1 LOG LEVELS
=head2 debug
    $log->is_debug;
    $log->debug($message);
=head2 info
    $log->is_info;
    $log->info($message);
=head2 warn
    $log->is_warn;
    $log->warn($message);
=head2 error
    $log->is_error;
    $log->error($message);
=head2 fatal
    $log->is_fatal;
    $log->fatal($message);
=head1 METHODS
=head2 new
Constructor. Defaults to enable all levels unless levels are provided in
arguments.
    $log = Catalyst::Log->new;
    $log = Catalyst::Log->new( 'warn', 'error' );
=head2 level
Contains a bitmask of the currently set log levels.
=head2 levels
Set log levels
    $log->levels( 'warn', 'error', 'fatal' );
=head2 enable
Enable log levels
    $log->enable( 'warn', 'error' );
=head2 disable
Disable log levels
    $log->disable( 'warn', 'error' );
=head2 is_debug
=head2 is_error
=head2 is_fatal
=head2 is_info
=head2 is_warn
Is the log level active?
=head2 abort
Should Catalyst emit logs for this request? Will be reset at the end of
each request.
*NOTE* This method is not compatible with other log apis, so if you plan
to use Log4Perl or another logger, you should call it like this:
    $c->log->abort(1) if $c->log->can('abort');
=head2 _send_to_log
 $log->_send_to_log( @messages );
This protected method is what actually sends the log information to STDERR.
You may subclass this module and override this method to get finer control
over the log output.
=head2 meta
=head1 SEE ALSO
L<Catalyst>.
=head1 AUTHORS
Catalyst Contributors, see Catalyst.pm
=head1 COPYRIGHT
This library is free software. You can redistribute it and/or modify
it under the same terms as Perl itself.
=cut
__PACKAGE__->meta->make_immutable;
1;