#!/usr/bin/perl -w
#
# xmlrpc based munin plugin for monitoring rtorrent's peer 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
#
#%# family=auto


if ( $ARGV[0] and $ARGV[0] eq "config" ) {
  my $category = $ENV{"category"} || "";
  print "graph_title rTorrent peer statistics\n";
  print "graph_args --base 1000 --lower-limit 0\n";
  print "graph_vlabel peers\n";
  print "graph_category filetransfer".${category}."\n";
  print "outgoing.label outgoing\n";
  print "outgoing.draw AREA\n";
  print "outgoing.info number of outgoing connections\n";
  print "incoming.label incoming\n";
  print "incoming.draw STACK\n";
  print "incoming.info number of incoming connections\n";
  print "plain.label plain text\n";
  print "plain.draw LINE2\n";
  print "plain.info number of plain text connections\n";
  print "encrypted.label encrypted\n";
  print "encrypted.draw LINE2\n";
  print "encrypted.info number of encrypted connections\n";
  print "total.label total\n";
  print "total.draw LINE2\n";
  print "total.info total number of connections\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><(int|i4|i8|ex\.i8)>(\d+)<\/(int|i4|i8|ex\.i8)><\/value>/;
my $tpattern  = qr/[0-9A-F]{20}/;

my $line        = "";
if ($api =~ /pre09/) {
  $line         = "<?xml version=\"1.0\" encoding=\"utf-8\"?><methodCall><methodName>d.multicall</methodName><params><param><value><string>main</string></value></param><param><value><string>d.get_hash=</string></value></param><param><value><string>p.multicall=,p.is_encrypted=,p.is_incoming=</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>main</string></value></param><param><value><string>d.hash=</string></value></param><param><value><string>p.multicall=,p.is_encrypted=,p.is_incoming=</string></value></param></params></methodCall>";
}
my $llen  = length $line;
my $header  = "CONTENT_LENGTH\000${llen}\000SCGI\001\000";
my $hlen  = length $header;

my $tor = 0;
my $tot = 0;
my $enc = 0;
my $inc = 0;
my $pline = "";
my $ppline = "";
my $out = 0;
my $pla = 0;


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 ( $line =~ /$tpattern/ ) {
        $tor += 1;
      } elsif ( $line =~ /$pattern/ ) {
        $tot += 1;
        $enc += $2;
        $line = <SOCK>;
        $line =~ /$pattern/;
        $inc += $2;
      }
      $ppline = $pline;
      $pline = $line;
    }
    close (SOCK);
    $out = $out + $tot - $inc;
    $pla = $pla + $tot - $enc;
  }
} 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 ( $line =~ /$tpattern/ ) {
        $tor += 1;
      } elsif ( $line =~ /$pattern/ ) {
        $tot += 1;
        $enc += $2;
        $line = <SOCK>;
        $line =~ /$pattern/;
        $inc += $2;
      }
      $ppline = $pline;
      $pline = $line;
    }
    close (SOCK);
    $out = $out + $tot - $inc;
    $pla = $pla + $tot - $enc;
  }
}


print "torrents.value ${tor}\ntotal.value ${tot}\nencrypted.value ${enc}\nplain.value ${pla}\nincoming.value ${inc}\noutgoing.value ${out}\n";

exit;