Class: QuartzTorrent::UdpTrackerDriver

Inherits:
TrackerDriver show all
Defined in:
lib/quartz_torrent/udptrackerdriver.rb

Overview

A tracker driver that uses the UDP protocol as defined by xbtt.sourceforge.net/udp_tracker_protocol.html

Constant Summary collapse

ReceiveLength =

Set UDP receive length to a value that allows up to 100 peers to be returned in an announce.

620

Instance Method Summary collapse

Constructor Details

#initialize(announceUrl, infoHash, timeout = 2) ⇒ UdpTrackerDriver

Returns a new instance of UdpTrackerDriver.



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# File 'lib/quartz_torrent/udptrackerdriver.rb', line 6

def initialize(announceUrl, infoHash, timeout = 2)
  super()
  @announceUrl = announceUrl
  @infoHash = infoHash
  @timeout = timeout
  @logger = LogManager.getLogger("udp_tracker_client")
  if @announceUrl =~ /udp:\/\/([^:]+):(\d+)/
    @host = $1
    @trackerPort = $2
  else
    throw "UDP Tracker announce URL is invalid: #{announceUrl}"
  end
end

Instance Method Details

#request(event = nil) ⇒ Object 



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# File 'lib/quartz_torrent/udptrackerdriver.rb', line 20

def request(event = nil)
  if event == :started
    event = UdpTrackerMessage::EventStarted
  elsif event == :stopped
    event = UdpTrackerMessage::EventStopped
  elsif event == :completed
    event = UdpTrackerMessage::EventCompleted
  else
    event = UdpTrackerMessage::EventNone
  end

  socket = UDPSocket.new
  result = nil
  begin
    socket.connect @host, @trackerPort

    @logger.debug "Sending UDP tracker request to #{@host}:#{@trackerPort}"

    # Send connect request
    req = UdpTrackerConnectRequest.new
    socket.send req.serialize, 0
    resp = UdpTrackerConnectResponse.unserialize(readWithTimeout(socket,ReceiveLength,@timeout))
    @logger.debug "Connect response: #{resp.inspect}"
    raise "Invalid connect response: response transaction id is different from the request transaction id" if resp.transactionId != req.transactionId
    connectionId = resp.connectionId

    dynamicParams = @dynamicRequestParamsBuilder.call

    # Send announce request      
    req = UdpTrackerAnnounceRequest.new(connectionId)
    req.peerId = dynamicParams.peerId
    req.infoHash = @infoHash
    req.downloaded = dynamicParams.downloaded
    req.left = dynamicParams.left
    req.uploaded = dynamicParams.uploaded
    req.event = event
    #req.port = socket.addr[1]
    req.port = dynamicParams.port
    socket.send req.serialize, 0
    resp = UdpTrackerAnnounceResponse.unserialize(readWithTimeout(socket,ReceiveLength,@timeout))
    @logger.debug "Announce response: #{resp.inspect}"

    peers = []
    resp.ips.length.times do |i|
      ip = resp.ips[i].unpack("CCCC").join('.')
      port = resp.ports[i].unpack("n").first
      peers.push TrackerPeer.new ip, port
    end
    peers

    result = TrackerResponse.new(true, nil, peers)
    result.interval = resp.interval if resp.interval
  rescue
    result = TrackerResponse.new(false, $!, [])
  ensure
    socket.close if ! socket.closed?
  end
  result
end