#!perl -w

=head1 NAME

connection_time - log the duration of a connection

=head1 DESCRIPTION

The B<connection_time> plugin records the time of a connection between the
first and the last possible hook in qpsmtpd (I<pre-connection> and
I<post-connection>) and writes a C<LOGINFO> (default, see below) line to
the log.

=head1 CONFIG

=head2 loglevel

Adjust the quantity of logging for this plugin. See docs/logging.pod

 connection_time loglevel +1   (less logging)

 connection_time loglevel -1   (more logging)

=cut

use strict;
use warnings;

use Time::HiRes qw(gettimeofday tv_interval);
use Qpsmtpd::Constants;

sub register {
    my ($self, $qp) = shift, shift;
    if ( @_ == 1 ) {              # backwards compatible
        $self->{_args}{loglevel} = shift;
        if ( $self->{_args}{loglevel} =~ /\D/ ) {
            $self->{_args}{loglevel} = Qpsmtpd::Constants::log_level($self->{_args}{loglevel});
        };
        $self->{_args}{loglevel} ||= 6;
    }
    elsif ( @_ % 2 ) {
       $self->log(LOGERROR, "invalid arguments");
    }
    else {
        $self->{_args} = { @_ };     # named args, inherits loglevel
    }
}

sub hook_pre_connection {
    my ($self, @foo) = @_;
    $self->{_connection_start} = [gettimeofday];
    $self->log(LOGDEBUG, "started at " . $self->{_connection_start} );
    return (DECLINED);
}

sub hook_post_connection {
    my ($self, @foo) = @_;

    if ( ! $self->{_connection_start} ) {
        $self->log(LOGERROR, "Start time not set?!");
        return (DECLINED);
    };

    my $elapsed = tv_interval( $self->{_connection_start}, [gettimeofday] );

    $self->log(LOGINFO, sprintf "%.3f s.", $elapsed );
    return (DECLINED);
}