#!/usr/bin/perl -w
# -*- perl -*-
# vim: ft=perl
#
# Copyright (C) 2006 Lars Strand
#
# Munin plugin to monitor swap usage by use of SNMP.
# Based on the snmp__df plugin
#
# This program is free software; you can redistribute it and/or
# modify it under the terms of the GNU General Public License
# as published by the Free Software Foundation; version 2 dated June,
# 1991.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program; if not, write to the Free Software
# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
#
# $Log$
#
#%# family=snmpauto
#%# capabilities=snmpconf

use strict;
use Munin::Plugin::SNMP;


my $response;

if (defined $ARGV[0] and $ARGV[0] eq "snmpconf") {
    # HOST-RESOURCES-MIB::hrStorageType
    # HOST-RESOURCES-TYPES::hrStorageVirtualMemory
    print "require 1.3.6.1.2.1.25.2.3.1.2. 1.3.6.1.2.1.25.2.1.3\n";
    exit 0;
}

my $session = Munin::Plugin::SNMP->session();

my $hrStorage = "1.3.6.1.2.1.25.2.";
my $hrStorageVirtualMemory = "1.3.6.1.2.1.25.2.1.3";
my $hrStorageSize = "1.3.6.1.2.1.25.2.3.1.5.";
my $hrStorageUsed = "1.3.6.1.2.1.25.2.3.1.6.";

my $swap_d = $session->get_by_regex($hrStorage, $hrStorageVirtualMemory);

my $swapsize = 0;
my $swapused = 0;

foreach my $swap (keys %$swap_d) {
    $swapsize += $session->get_single($hrStorageSize . $swap);
    $swapused += $session->get_single($hrStorageUsed . $swap);
}

if (defined $ARGV[0] and $ARGV[0] eq "config") {
    my ($host) = Munin::Plugin::SNMP->config_session();
    print "host_name $host\n" unless $host eq 'localhost';
    print "graph_title Virtual memory usage\n";
    if ($swapsize > 0) {
	print "graph_args -l 0 --base 1024 --upper-limit $swapsize\n";
    } else {
	print "graph_args -l 0 --base 1024\n";
    }
    print "graph_vlabel Bytes\n";
    print "graph_category disk\n";
    print "graph_info This graph shows swap usage in bytes.\n";
    print "swap.label swap\n";
    print "swap.type DERIVE\n";
    print "swap.min 0\n";
    exit 0;
}

print "swap.value $swapused\n";