#!perl -Tw
# this is a simple 'transaction_id' plugin like the default builtin logging
#
# It demonstrates that a logging plugin can call ->log itself as well
# as how to ignore log entries from itself

sub register {
  my ($self, $qp, $loglevel) = @_;
  die "The transaction ID feature is currently unsupported";

  $self->{_level} = LOGWARN;
  if ( defined($loglevel) ) {
      if ($loglevel =~ /^\d+$/) {
	  $self->{_level} = $loglevel;
      }
      else {
	  $self->{_level} = log_level($loglevel);
      }
  }

  # If you want to capture this log entry with this plugin, you need to
  # wait until after you register the plugin
  $self->log(LOGINFO,'Initializing logging::transaction_id plugin');
}

sub hook_logging {
  my ($self, $transaction, $trace, $hook, $plugin, @log) = @_;

  # Don't log your own log entries!  If this is the only logging plugin
  # then these lines will not be logged at all.  You can safely comment
  # out this line and it will not cause an infinite loop.
  return DECLINED if defined $plugin and $plugin eq $self->plugin_name; 

  warn 
    join(" ", ($transaction ? $transaction->id : "???") .
         (defined $plugin ? " $plugin plugin:" :
          defined $hook   ? " running plugin ($hook):"  : ""),
         @log), "\n"
    if ($trace <= $self->{_level});

  return DECLINED;
}

=head1 NAME

transaction_id - plugin to demo use of the transaction id

=head1 DESCRIPTION

A qpsmtpd plugin which replicates the built in logging functionality, which
is to send all logging messages to STDERR below a specific log level.

This plugin differs from logging/warn only by using the transaction id
instead of the pid to demonstrate the effect of different algorithms.

=head1 INSTALL AND CONFIG

Place this plugin in the plugin/logging directory beneath the standard
qpsmtpd installation.  Edit the config/logging file and add a line like
this:

  logging/transaction_id [loglevel]

where the optional parameters C<loglevel> is either the numeric or text
representation of the maximum log level, as shown in the
L<config.sample/loglevel> file.

=head1 AUTHOR

John Peacock <jpeacock@cpan.org>

=head1 COPYRIGHT AND LICENSE

Copyright (c) 2005 John Peacock

This plugin is licensed under the same terms as the qpsmtpd package itself.
Please see the LICENSE file included with qpsmtpd for details.

=cut