#!@@PERL@@ -w
#
# Plugin to monitor the volume of mails delivered by postfix.
#
# Usage: copy or link into /etc/munin/node.d/
#
# Parameters:
#
# 	config   (required)
# 	autoconf (optional - used by munin-config)
#
# Config variables:
#
# 	logdir       - Which logfile to use
#	logfile      - What file to read in logdir
#
# $Log$
# Revision 1.6.2.2  2005/01/25 20:26:10  jimmyo
# Turn on graph_scale for generic/postfix_mailvolume.
#
# Revision 1.6.2.1  2005/01/25 20:24:10  jimmyo
# Improved graph_title of generic/postfix_* (Deb#292083).
#
# Revision 1.6  2004/12/10 18:51:43  jimmyo
# linux/apt* has been forced to LANG=C, to get predictable output.
#
# Revision 1.5  2004/12/10 10:47:47  jimmyo
# Change name from ${scale} to ${graph_period}, to be more consistent.
#
# Revision 1.4  2004/12/09 22:12:55  jimmyo
# Added "graph_period" option, to make "graph_sums" usable.
#
# Revision 1.3  2004/05/20 19:02:36  jimmyo
# Set categories on a bunch of plugins
#
# Revision 1.2  2004/05/14 21:16:46  jimmyo
# "Upped" som plugins from contrib/manual to auto.
#
# Revision 1.1  2004/01/02 18:50:00  jimmyo
# Renamed occurrances of lrrd -> munin
#
# Revision 1.1.1.1  2004/01/02 15:18:07  jimmyo
# Import of LRRD CVS tree after renaming to Munin
#
# Revision 1.1  2003/11/26 14:45:34  jimmyo
# New plugins
#
# Revision 1.7  2003/11/15 11:10:28  jimmyo
# Various fixes
#
# Revision 1.6  2003/11/07 17:43:16  jimmyo
# Cleanups and log entries
#
#
#
# Magic markers (optional - used by munin-config and some installation
# scripts):
#
#%# family=auto
#%# capabilities=autoconf

# To search for postconf
$ENV{PATH} = $ENV{PATH} . ":/sbin:/usr/sbin:/usr/local/sbin"; 

my $statefile = "@@PLUGSTATE@@/munin-plugin-postfix_mailvolume.state";
my $pos   = undef;
my $volume = 0;
my $LOGDIR  = $ENV{'logdir'}  || '/var/log';
my $LOGFILE = $ENV{'logfile'} || 'syslog';

if ( $ARGV[0] and $ARGV[0] eq "autoconf" )
{
    my $logfile;
    `which postconf >/dev/null 2>/dev/null`;
    if ($?)
    {
	if (-d $LOGDIR)
	{
	    $logfile = "$LOGDIR/$LOGFILE";

	    if (-f $logfile)
	    {
		if (-r "$logfile")
		{
		    print "yes\n";
		    exit 0;
		}
		else
		{
		    print "no (logfile not readable)\n";
		}
	    }
	    else
	    {
		print "no (logfile not found)\n";
	    }
	}
	else
	{
	    print "no (could not find logdir)\n";
	}
    }
    else
    {
	    print "no (postfix not found)\n";
    }
    exit 1;
}

my $logfile = "$LOGDIR/$LOGFILE";
my $prevdate = get_prev_date();

if (-f "$logfile.$prevdate")
{
    $rotlogfile = "$logfile.$prevdate";
}
elsif (-f "$logfile.0")
{
    $rotlogfile = $logfile . ".0";
}
elsif (-f "$logfile.1")
{
    $rotlogfile = $logfile . ".1";
}
elsif (-f "$logfile.01")
{
    $rotlogfile = $logfile . ".01";
}
else
{
    $rotlogfile = $logfile . ".0";
}

if (-f "$statefile")
{
    open (IN, "$statefile") or exit 4;
    if (<IN> =~ /^(\d+):(\d+)/)
    {
	($pos, $volume) = ($1, $2);
    }
    close IN;
}

if (! -f $logfile and ! -f $rotlogfile)
{
    print "delivered.value U\n";
    exit 0;
}


$startsize = (stat $logfile)[7];

if (!defined $pos)
{
    # Initial run.
    $pos = $startsize;
}

if ($startsize < $pos)
{
    # Log rotated
    parseLogfile ($rotlogfile, $pos, (stat $rotlogfile)[7]);
    $pos = 0;
}

parseLogfile ($logfile, $pos, $startsize);
$pos = $startsize;

if ( $ARGV[0] and $ARGV[0] eq "config" )
{
    print "graph_title Postfix bytes throughput\n";
    print "graph_args --base 1000 -l 0\n";
    print "graph_vlabel bytes / \${graph_period}\n";
    print "graph_scale  yes\n";
    print "graph_category  postfix\n";
    print "volume.label throughput\n";
    print "volume.type DERIVE\n";
    print "volume.min 0\n";
    exit 0;
}

print "volume.value $volume\n";

if(-l $statefile) {
	die("$statefile is a symbolic link, refusing to touch it.");
}				
open (OUT, ">$statefile") or exit 4;
print OUT "$pos:$volume\n";
close OUT;

sub parseLogfile 
{    
    my ($fname, $start, $stop) = @_;
    open (LOGFILE, $fname) or exit 3;
    seek (LOGFILE, $start, 0) or exit 2;

    while (tell (LOGFILE) < $stop) 
    {
	my $line =<LOGFILE>;
	chomp ($line);

	if ($line =~ /qmgr.*from=.*size=([0-9]+)/) 
	{
	    $volume += $1;
	} 
    }
    close(LOGFILE);    
}

sub get_prev_date
{
	my @date = localtime (time - 86400);
	my $prevdate = $date[5]+1900 . $date[4]+1 . $date[3];
	return $prevdate;
}

# vim:syntax=perl
