#!/usr/bin/perl
#
# 2007-06-26
# Written by Ghost
#
# 2008-04-16
# Update: Wildcard version
#
# 2008-11-12
# Update: Perl RCON system
#
# Configuration variables
#
#   srcdspass     - RCON password
#   srcdssamples  - Number of samples to take (optional, default: 5)
#   srcdsfpsmax   - Maximum FPS on the game server (optional, default: 1000)
#
# Magic markers - optional - used by installation scripts and
# munin-config:
#
#%# family=contrib
#%# capabilities=autoconf

use strict;

# Set library path correctly
use File::Basename;
if (-l $0) {
    push(@INC, dirname(readlink($0)));
}
push(@INC, dirname($0));

# Load Rcon module or exit with failure message
if (!eval "require Rcon") {
    print "Failed to load Rcon module. ";
    print "Make sure Rcon.pm is copied to Munin plugins directory.\n";
    exit 1;
}

# Parse hostname and port from the plugin filename
my ($HOST, $PORT) = $0 =~ m/.*_([^:]+)_(\d+)$/;
if (!defined($HOST) || !defined($PORT)) {
    print "Could not parse server address from filename.\n";
    exit 1;
}

# Load config variables or use default values
my $PASS    = $ENV{srcdspass}    || "";
my $SAMPLES = $ENV{srcdssamples} || 5;
my $MAX     = $ENV{srcdsfpsmax}  || 1000;

# Print config or do plugin test if asked
my $arg = shift();
if ($arg eq 'config') {
    print_config();
} elsif ($arg eq 'autoconf') {
    test_service();
}


#
# Main program starts here
#

my $fps_avg = 0;
my @fps_samples;

my $sock = Rcon::sock_connect($HOST, $PORT);
if (!$sock) {
    print "Could not open socket to $HOST:$PORT.\n";
    exit 1;
}
if (!Rcon::rcon_auth($sock, $PASS)) {
    print "Could not authenticate.\n";
    exit 1;
}

for (my $i = 0; $i < $SAMPLES; $i++) {
    my $reply = Rcon::rcon_command($sock, "stats");
    if (!defined($reply)) {
	print "Did not receive reply from server (sample $i).\n";
	next;
    }
    my @reply = split(/\n/, $reply);

    foreach my $statline (@reply) {
	next if ($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 {
    print("graph_title Server FPS at $HOST:$PORT\n",
	  "graph_args --base 1000\n",
	  "graph_vlabel FPS\n",
	  "graph_category games\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 $sock = Rcon::sock_connect($HOST, $PORT);
    if (!$sock) {
	print "no (could not open socket to $HOST:$PORT)\n";
	exit 0;
    }
    if (!Rcon::rcon_auth($sock, $PASS)) {
	print "no (could not authenticate)\n";
	exit 0;
    }
    if (!defined(Rcon::rcon_command($sock, "stats"))) {
	print "no (did not receive reply from server)\n";
	exit 0;
    }

    print "yes\n";
    exit 0;
}