#! /usr/bin/perl

use strict;
use warnings;
use Munin::Plugin;

my $config_filename = $ENV{"cubemap_config"} // "/etc/cubemap.config";
my $stats_filename = $ENV{"cubemap_stats"} // "/var/lib/cubemap/cubemap.stats";

my $mode = $ARGV[0] // "print";
if ($mode eq 'config') {
	print "graph_title Cubemap viewers\n";
	print "graph_category network\n";
	print "graph_vlabel viewers\n";
}

my %streams = ();

open my $config, "<", $config_filename
	or die "$config_filename: $!";
while (<$config>) {
	chomp;
	/^stream (\S+) / or next;
	my $stream = $1;
	$streams{$stream} = 0;

	my $stream_name = stream_name($stream);
	if ($mode eq 'config') {	
		print "${stream_name}.label Number of viewers of $stream\n";
		print "${stream_name}.type GAUGE\n";
		print "${stream_name}.min 0\n";
	}
}
close $config;

my $total = 0;	
if ($mode eq 'config') {	
	print "total.label Total number of viewers\n";
	print "total.type GAUGE\n";
	print "total.min 0\n";
}

open my $stats, "<", $stats_filename
	or die "$stats_filename: $!";
while (<$stats>) {
	chomp;
	my ($ip, $fd, $mark, $stream, $connected_time, $bytes_sent, $loss_bytes, $loss_events) = 
		/^(\S+) (\d+) (\d+) (\S+) (\d+) (\d+) (\d+) (\d+)/ or die "Invalid stats format";
	++$streams{$stream};
	++$total;
}
close $stats;
	
if ($mode ne 'config') {
	for my $stream (sort keys %streams) {
		my $stream_name = stream_name($stream);
		printf "${stream_name}.value %d\n", $streams{$stream};
	}
	printf "total.value %d\n", $total;
}

sub stream_name {
	my $stream = shift;
	$stream =~ y/a-z0-9/_/c;
	return $stream;
}