#!/usr/bin/perl -w
use strict;

my $spool = '/var/spool/courier';
my $queue = '/var/spool/courier/msgq/*';

my $delay = shift @ARGV || 5;
my $count = shift @ARGV;

my $watching = 1;

my $old_total = undef;
my $old_time = undef;
my $start_time = undef;
my $start_total = undef;
while ($watching)
{
    my $time = time;
    my $msgs = qx(find $spool/msgs -name 'D*'| wc -l);
    my $tmp = qx(find $spool/tmp -name 'D*' | wc -l);
    chomp ($msgs, $tmp);
    $msgs += 0;
    $tmp += 0;
    my $total = $msgs + $tmp;
    my $change = defined $old_total ? $total - $old_total : 0;
    my $tot_change = defined $start_total ? $total - $start_total : 0;
    printf("%02d:%02d:%02d %6d %4d (%5d) %6.2f/sec (%6.2f/sec)\n",
	   (localtime($time))[2,1,0],
	   # $msgs, $tmp,
	   $total,
	   $change,
	   $tot_change,
	   defined $old_time ? (1 * $change)/($time-$old_time) : 0,
	   defined $start_time ? (1 * $tot_change)/($time-$start_time) : 0
	   );
    $old_total = $total;
    $old_time = $time;
    $start_time = $time unless defined $start_time;
    $start_total = $total unless defined $start_total;

    sleep $delay if $delay and (not defined $count or $count > 1);
    if (defined $count)
    {
	--$count;
	$watching = 0 if $count <= 0;
    }
}

__END__

=head1 NAME

watch-mailq.pl - Give a running count of messages in Courier's mail queue.

=head1 SYSNOPSIS

watch-mailq.pl [delay] [repeat]

=head1 DESCRIPTION

=over 4

=item delay

Delay in seconds between checks. (Default: 5 sec)

=item repeat

Number of times to repeat the check. (Default: forever)

=back

B<Note:> The rate of change in the queue is I<not> the number of messages
processed per second. It only measures the change in the number of messages
still in the queue.

=head1 LICENSE

 Copyright (c) 2003 Randy Smith
 All rights reserved.

 Redistribution and use in source and binary forms, with or without
 modification, are permitted provided that the following conditions
 are met:
 1. Redistributions of source code must retain the above copyright
    notice, this list of conditions and the following disclaimer.
 2. Redistributions in binary form must reproduce the above copyright
    notice, this list of conditions and the following disclaimer in the
    documentation and/or other materials provided with the distribution.

 THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
 ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
 FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 SUCH DAMAGE.

=head1 AUTHOR

Randy Smith <perlstalker@amigo.net>

=cut