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123 lines
3.7 KiB
Markdown
123 lines
3.7 KiB
Markdown
# bittorrent-tracker [](https://travis-ci.org/feross/bittorrent-tracker) [](https://npmjs.org/package/bittorrent-tracker) [](https://www.gittip.com/feross/)
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#### Simple, robust, BitTorrent tracker (client & server) implementation
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Node.js implementation of a [BitTorrent tracker](https://wiki.theory.org/BitTorrentSpecification#Tracker_HTTP.2FHTTPS_Protocol), client and server.
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A **BitTorrent tracker** is an HTTP service which responds to GET requests from BitTorrent
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clients. The requests include metrics from clients that help the tracker keep overall
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statistics about the torrent. The response includes a peer list that helps the client
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participate in the torrent.
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Also see [bittorrent-dht](https://github.com/feross/bittorrent-dht). This module is used
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by [WebTorrent](http://webtorrent.io).
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## features
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- Includes client & server implementations
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- Supports UDP protocol ([BEP 15](http://www.bittorrent.org/beps/bep_0015.html)) (client only, for now)
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## install
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```
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npm install bittorrent-tracker
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```
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## usage
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### client
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To connect to a tracker, just do this:
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```js
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var Client = require('bittorrent-tracker').Client
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var parseTorrent = require('parse-torrent')
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var torrent = fs.readFileSync(__dirname + '/torrents/bitlove-intro.torrent')
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var parsedTorrent = parseTorrent(torrent) // { infoHash: 'xxx', length: xx, announce: ['xx', 'xx'] }
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var peerId = new Buffer('01234567890123456789')
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var port = 6881
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var client = new Client(peerId, port, parsedTorrent)
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// you must add an 'error' event handler!
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client.on('error', function (err) {
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console.log(err.message)
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// a tracker was unavailable or sent bad data to the client. you can probably ignore it
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})
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// start getting peers from the tracker
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client.start()
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client.on('update', function (data) {
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console.log('got a response from tracker: ' + data.announce)
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console.log('number of seeders on this tracker: ' + data.complete)
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console.log('number of leechers on this tracker: ' + data.incomplete)
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})
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client.once('peer', function (addr) {
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console.log('found a peer: ' + addr) // 85.10.239.191:48623
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})
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// announce that download has completed (and you are now a seeder)
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client.complete()
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// force a tracker announce. will trigger more 'update' events and maybe more 'peer' events
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client.update()
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// stop getting peers from the tracker, gracefully leave the swarm
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client.stop()
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```
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### server
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To start a BitTorrent tracker server to track swarms of peers:
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```js
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var Server = require('bittorrent-tracker').Server
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var server = new Server()
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// you must add an 'error' event handler!
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server.on('error', function (err) {
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console.log(err.message)
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})
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server.on('listening', function () {
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console.log('tracker server is listening!')
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})
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// start tracker server listening!
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server.listen(port)
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// listen for individual tracker messages from peers:
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server.on('start', function (addr, params) {
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console.log('got start message from ' + addr)
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console.log('params in the message: ' + JSON.stringify(params))
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})
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server.on('complete', function (addr, params) {})
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server.on('update', function (addr, params) {})
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server.on('stop', function (addr, params) {})
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// get info hashes for all torrents in the tracker server
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Object.keys(server.torrents)
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// get the number of seeders for a particular torrent
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server.torrents[infoHash].complete
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// get the number of leechers for a particular torrent
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server.torrents[infoHash].incomplete
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// get the peers who are in a particular torrent swarm
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server.torrents[infoHash].peers
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```
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## license
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MIT. Copyright (c) [Feross Aboukhadijeh](http://feross.org).
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