Added 'autoflush' to Catalyst::Log + enabled during setup

[catagits/Catalyst-Runtime.git] / lib / Catalyst / Log.pm

package Catalyst::Log;

use Moose;
with 'MooseX::Emulate::Class::Accessor::Fast';

use Data::Dump;
use Moose::Util 'find_meta';
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');
has autoflush => (is => 'rw');
has _psgi_logger => (is => 'rw', predicate => '_has_psgi_logger', clearer => '_clear_psgi_logger');
has _psgi_errors => (is => 'rw', predicate => '_has_psgi_errors', clearer => '_clear_psgi_errors');

sub clear_psgi {
    my $self = shift;
    $self->_clear_psgi_logger;
    $self->_clear_psgi_errors;
}

sub psgienv {
    my ($self, $env) = @_;

    $self->_psgi_logger($env->{'psgix.logger'}) if $env->{'psgix.logger'};
    $self->_psgi_errors($env->{'psgi.errors'}) if $env->{'psgi.errors'};
}


{
    my @levels = qw[ debug info warn error fatal ];

    my $meta = find_meta(__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 $message = join( "\n", @_ );
    if ($self->can('_has_psgi_logger') and $self->_has_psgi_logger) {
        $self->_psgi_logger->({
                level => $level,
                message => $message,
            });
    } else {
        $message .= "\n" unless $message =~ /\n$/;
        my $body = $self->_body;
        $body .= sprintf( "[%s] %s", $level, $message );
        $self->_body($body);
    }
    if( $self->autoflush && !$self->abort ) {
      $self->_flush;
    }
}

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 $self = shift;
    if ($self->can('_has_psgi_errors') and $self->_has_psgi_errors) {
        $self->_psgi_errors->print(@_);
    } else {
        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__

=for stopwords psgienv

=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 autoflush

When enabled, messages are written to the log immediately instead of queued
until the end of the request. By default, autoflush is enabled during setup,
but turned back off thereafter. This is done purely for legacy support,
specifically for L<Catalyst::Plugin::Static::Simple>, and may be changed in
the future.

=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 psgienv $env

    $log->psgienv($env);

NOTE: This is not meant for public consumption.

Set the PSGI environment for this request. This ensures logs will be sent to
the right place. If the environment has a C<psgix.logger>, it will be used. If
not, we will send logs to C<psgi.errors> if that exists. As a last fallback, we
will send to STDERR as before.

=head2 clear_psgi

Clears the PSGI environment attributes set by L</psgienv>.

=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;