#!/usr/bin/perl -w
#
# xmlrpc based munin plugin for monitoring rtorrent's torrent count
# prerequisites:
#  - rtorrent 0.7.5 or newer compiled with --with-xmlrpc-c
# check http://libtorrent.rakshasa.no/wiki/RTorrentXMLRPCGuide for further information
#
# written by Gabor Hudiczius
# web: http://projects.cyla.homeip.net/rtwi/wiki/rTorrentOMeter
# email: ghudiczius@gmail.com
#
# 0.2.0 - 080619
#  support for scgi_port and scgi_local
#  configurable via munin env variables
#  initial release
#
#
# Parameters:
#
#       config          required
#
#
# Configurable variables
#
#       src             "socket" when using scgi_socket, or anything else when using scgi_port
#       socket          rTorrent's rpc socket (scgi_local)      - using scgi_local      - needed, when "src" is set to "socket"
#       category        Change graph category
#       api             use "pre09" (pre 0.9.0) or "current" (0.9.0+, the default) API calls
#
# Configuration example
#
#       [rtom_allsessions_*]
#       user username
#       env.src socket
#       env.socket /home/user/torrent/.socket/rpc.socket,/home/user/torrent/.socket/rpc.socket
#       env.category Category
#       env.api current
#
#       [rtom_allsessions_*]
#       user username
#       env.port 5000,5001,5002,5003
#       env.category Category
#       env.api pre09
#
#%# family=auto

my @views = ( "default", "started", "stopped", "complete", "incomplete" );

if ( $ARGV[0] and $ARGV[0] eq "autoconf" ) {
  exit 1;
}

if ( $ARGV[0] and $ARGV[0] eq "config" ) {
  my $category = $ENV{"category"} || "";
  print "graph_args --base 1000 -r --lower-limit 0\n";
  print "graph_title rTorrent volume\n";
  print "graph_vlabel active torrents\n";
  print "graph_category filetransfer".${category}."\n";
  print "complete.label complete\n";
  print "complete.draw AREA\n";
  print "complete.info complete torrents\n";
  print "incomplete.label incomplete\n";
  print "incomplete.draw STACK\n";
  print "incomplete.info incomplete torrents\n";
  print "stopped.label stopped\n";
  print "stopped.draw LINE2\n";
  print "stopped.info stopped torrents\n";
  print "started.label started\n";
  print "started.draw LINE2\n";
  print "started.info started torrents\n";
  print "default.label total\n";
  print "default.draw LINE2\n";
  print "default.info all torrents\n";
  print "hashing.graph no\n";
  print "seeding.graph no\n";
  print "active.graph no\n";
  exit 0;
}

use IO::Socket;

my $src         = $ENV{"src"} || "";
my @sockets     = split /,/, $ENV{"socket"} || "";
my $ip          = $ENV{"ip"} || "127.0.0.1";
my @ports       = split /,/, $ENV{"port"} || "";
my $api         = $ENV{"api"} || "current";

my $pattern     = qr/<value><string>([A-Z0-9]+)<\/string><\/value>/;

foreach ( @views ) {
  my $num = 0;
  my $line = "";
  if ($api =~ /pre09/) {
    $line = "<?xml version=\"1.0\" encoding=\"utf-8\"?><methodCall><methodName>d.multicall</methodName><params><param><value><string>${_}</string></value></param><param><value><string>d.get_hash=</string></value></param></params></methodCall>";
  } else {
    $line = "<?xml version=\"1.0\" encoding=\"utf-8\"?><methodCall><methodName>d.multicall2</methodName><params><param><value><string></string></value></param><param><value><string>${_}</string></value></param><param><value><string>d.hash=</string></value></param></params></methodCall>";
  }
  my $llen = length $line;
  my $header = "CONTENT_LENGTH\000${llen}\000SCGI\001\000";
  my $hlen = length $header;

  if ( ( defined $src ) && ( $src eq "socket" ) ) {
    for $socket (@sockets)
    {
      socket( SOCK, PF_UNIX, SOCK_STREAM, 0 ) or die;
      connect( SOCK, sockaddr_un( $socket ) ) or die $!;
      my $line = "${hlen}:${header},${line}";
      print SOCK $line;
      flush SOCK;
      while ( $line = <SOCK> ) {
        if ( $line =~ /$pattern/ ) {
          $num++;
        }
      }
      close (SOCK);
    }
  } else {
    for $port (@ports)
    {
      socket( SOCK, PF_INET, SOCK_STREAM, getprotobyname( "tcp" ) );
      connect( SOCK, sockaddr_in( $port, inet_aton( $ip ) ) );
      my $line = "${hlen}:${header},${line}";
      print SOCK $line;
      flush SOCK;
      while ( $line = <SOCK> ) {
        if ( $line =~ /$pattern/ ) {
          $num++;
        }
      }
      close (SOCK);
    }
  }
  print "${_}.value ${num}\n";
}

exit;