Bittorrent Udp Tracker

udp tracker implementation for bittorrent.

Features

1. implemented spcification from here and here
2. fully tested

Installation

npm i bittorrent-udp-tracker --save

Test

npm test

Usage

var UdpTracker = require('bittorrent-udp-tracker')

var udpTracker = new UdpTracker(new Buffer('01234567890123456789'), new Buffer('12345678901234567890'), announceUrl, {'port': 1234})
udpTracker.announce(2, {
  downloaded: 0,
  left: 0,
  uploaded: 0
})

udpTracker.on('error', function (err) {
  throw new Error(err)
})

udpTracker.on('update', function (msg) {
  console.log(msg)
  udpTracker.destory()
})

update event will return json stringified object. It will have following format

{
  leechers: 12,
  seeds: 12,
  peers: ['10.12.12.12.:1234', '109.12.90.15.:1234']
}

error event will return error message.

API

1. new UdpTracker(peerId, infoHash, opts)

   It will return instance of UdpTracker.It is also instance of EventEmitter.

   var udpTracker = new UdpTracker(new Buffer('01234567890123456789'), new Buffer('12345678901234567890'), announceUrl, {'port': 1234})

   • peerId: unique Id for peer (20 bytes)
   • infoHash: infoHash for torrent (20 bytes)
   • opts:

   {
     port: (16 bytes),
     _timeout: timeout for announce try in miliseconds
   }
   

2. udpTracker.announce(event, opts)

announce event to tracker

• event: event type to announce

  none = 0
  completed = 1
  started = 2
  stopped = 3

• opts: announce options to send following are consider,

  • downloaded: 8 bytes long
  • left: 8 bytes long
  • uploaded: 8 byte long

3. udpTracker.destroy()

stop sending announce request to trackers.

TODO

following things need to implement.

• udp tracker timeout
• announce interval handling
• implement scraping
• support IP6
• implement extensions
• authentication
• request string

Implementation Details

1. Time outs

bittorrent udp tracker timeout specification is implemented

2. Announce Interval

announce response sends interval (in second) which says do not send another announce request before interval. So even you called announce we do not send announce request immediately instead we wait till interval time is over. After Interval time is over we send announce request with most recent announce request options.

3. Stoping Tracker

As announce return interval to make new announce request.We keep making announce request. To stop tracker you have to call explicitly destory() api

Inspiration

This module Inspiration is taken from feross's bittorrent-tracker modules's file. udp-tracker.js.

Contributions

please create issue if you are having problem with module.

License

MIT