--- /dev/null
+#! /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;
+}