#!/usr/bin/perl
#
# 2007-06-26
# Written by Ghost
#
# 2008-04-16
# Update: Wildcard version
#
# Requirements: "rcon" command written by [ASY]Zyrain
# [ http://trog.qgl.org/browse/docs/code/hl2rcon.c ]
#
# Configuration variables
#
#   srcdspass     - RCON password
#   srcdsrcon     - Path to rcon command (optional)
#   srcdssamples  - Number of samples to take (optional, default: 5)
#   srcdsfpsmax   - Maximum FPS on the game server (optional, default: 500)
#
# Magic markers - optional - used by installation scripts and
# munin-config:
#
#%# family=contrib
#%# capabilities=autoconf

use strict;

my ($HOST, $PORT) = $0 =~ m/.*_([^:]+)_(\d+)$/;
exit 1 if (!defined($HOST) || !defined($PORT));

my $PASS    = $ENV{srcdspass}    || "";
my $RCON    = $ENV{srcdsrcon}    || "/usr/local/bin/rcon";
my $SAMPLES = $ENV{srcdssamples} || 5;
my $MAX     = $ENV{srcdsfpsmax}  || 1000;
my $COMMAND = "$RCON -a$HOST -p$PORT -P$PASS stats";

my $arg = shift();

if ($arg eq 'config') {
    print_config();
} elsif ($arg eq 'autoconf') {
    test_service();
}


my $fps_avg = 0;
my @fps_samples;

for (my $i = 0; $i < $SAMPLES; $i++) {
    my $statline;
    open (SERVICE, "$COMMAND |")
	or die ("Could not execute '$COMMAND': $!");
    
    while(<SERVICE>) {
	$statline = $_;
	next if ($statline !~ m/\s*[\w+\.]+\s+[\w+\.]+\s+[\w+\.]+\s+\d+\s+\d+\s+[\w+\.]+\s+\d+/);
	my ($cpu, $in, $out, $uptime, $users, $fps, $players) = ($statline =~ m/^\s*([\w+\.]+)\s+([\w+\.]+)\s+([\w+\.]+)\s+(\d+)\s+(\d+)\s+([\w+\.]+)\s+(\d+)/);

	if (defined($fps)) {
	    push(@fps_samples, $fps);
	}
    }
    select(undef, undef, undef, 0.2); # Wait moment before next sample
}

# MEAN
if (@fps_samples) {
    foreach (@fps_samples) {
        $fps_avg += int($_);
    }
    $fps_avg /= ($#fps_samples+1);
    $fps_avg = int($fps_avg);
    print "fps.value $fps_avg\n";
}

# MEDIAN
#if (@fps_samples) {
#    @fps_samples = sort {$a <=> $b} @fps_samples;
#    my $median = int($#fps_samples / 2 + 0.5);
#    $fps_avg = $fps_samples[$median];
#}


sub print_config {

    my $num = 0;

    print("graph_title Server FPS at $HOST:$PORT\n",
	  "graph_args --base 1000\n",
	  "graph_vlabel FPS\n",
	  "graph_category SourceDS\n",
	  "graph_info The number of frames per second generated by Source game server, such as HL2, CS:S and DoD:S.\n");

    print ("fps.label FPS\n",
	   "fps.min 0\n",
	   "fps.max $MAX\n",
	   "fps.type GAUGE\n");

    exit 0;
}


sub test_service {

    my $return = 1;

    system ("$RCON >/dev/null 2>/dev/null");
    if ($? == 0)
    {
	system ("$COMMAND >/dev/null 2>/dev/null");
	if ($? == 0)
	{
	    print "yes\n";
	    $return = 0;
	}
	else
	{
	    print "no (could not connect to server $HOST:$PORT, verify address and srcdspass)\n";
	}
    }
    else
    {
	print "no (rcon command not found, see install instructions)\n";
    }
    exit $return;
}