#!/usr/bin/perl -w
# -*- perl -*-

=head1 NAME

fastd_traffic_ - Plugin to monitor fastd traffic

=head1 CONFIGURATION

Set user and group to have access to the socket
Set path to socketfile if not /tmp/fastd.sock

    [fastd_traffic_*]
    user fastd
    group fastd
    env.socketfile /tmp/fastd.sock

=head1 USAGE

Link this plugin to /etc/munin/plugins/ 

After creating the links, restart munin-node. Don't forget to configure the plugin!

=head1 AUTHORS

Dominique Goersch <mail@dgoersch.info>
Niklas Yann Wettengel <niyawe@niyawe.de>

=head1 LICENSE

GPLv2

=head1 MAGIC MARKERS

 #%# family=manual

=cut


use strict;
use warnings;
use File::Basename;
use IO::Socket::UNIX qw( SOCK_STREAM );
use JSON;

if ($ARGV[0] and $ARGV[0] eq "config") {                                                #config graph
	print "graph_order down up\n";
	print "graph_title fastd traffic\n";
	print "graph_args --base 1000\n";
	print "graph_vlabel bits in (-) / out (+) per second\n";
	print "graph_category fastd\n";
	print "graph_info This graph shows the traffic of fast.\n";
	print "down.label received\n";
	print "down.type DERIVE\n";
	print "down.graph no\n";
	print "down.cdef down,8,*\n";
	print "down.min 0\n";
	print "up.label bps\n";
	print "up.type DERIVE\n";
	print "up.negative down\n";
	print "up.cdef up,8,*\n";
	print "up.min 0\n";
    exit 0;
}


my $statusfile = exists $ENV{'socketfile'} ? $ENV{'socketfile'} : "/tmp/fastd.sock";    #get path to socket from environment or use default
my $socket = IO::Socket::UNIX->new(Type => SOCK_STREAM,Peer => $statusfile)             #open socket
   or die("Can't connect to server: $!\n");

my $fastdstatus = "";
foreach my $line (<$socket>) {$fastdstatus .= $line;}                                   #read contents from socket
my $json = decode_json($fastdstatus);                                                   #decode json

my $fastd_rx_bytes   = $json->{statistics}->{rx}->{bytes};                              #get recieved bytes from json
my $fastd_tx_bytes   = $json->{statistics}->{tx}->{bytes};                              #get transmittetd bytes from json

print "up.value $fastd_tx_bytes\n";                                                 #return transmitted bytes
print "down.value $fastd_rx_bytes\n";                                               #and recieved bytes