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270 lines
8.4 KiB
Markdown
270 lines
8.4 KiB
Markdown
# bittorrent-tracker [![travis][travis-image]][travis-url] [![npm][npm-image]][npm-url] [![downloads][downloads-image]][downloads-url]
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[travis-image]: https://img.shields.io/travis/feross/bittorrent-tracker/master.svg
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[travis-url]: https://travis-ci.org/feross/bittorrent-tracker
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[npm-image]: https://img.shields.io/npm/v/bittorrent-tracker.svg
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[npm-url]: https://npmjs.org/package/bittorrent-tracker
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[downloads-image]: https://img.shields.io/npm/dm/bittorrent-tracker.svg
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[downloads-url]: https://npmjs.org/package/bittorrent-tracker
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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 a web service which responds to 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 swarm.
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This module is used by [WebTorrent](http://webtorrent.io).
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## features
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- Includes client & server implementations
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- Supports all mainstream tracker types:
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- HTTP trackers
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- UDP trackers ([BEP 15](http://www.bittorrent.org/beps/bep_0015.html))
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- WebTorrent trackers ([BEP forthcoming](http://webtorrent.io))
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- Supports ipv4 & ipv6
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- Supports tracker "scrape" extension
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- Robust and well-tested
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- Comprehensive test suite (runs entirely offline, so it's reliable)
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- Used by popular clients: [WebTorrent](http://webtorrent.io), [peerflix](https://github.com/mafintosh/peerflix), and [playback](https://mafintosh.github.io/playback/)
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- Tracker statistics available via web interface at `/stats` or JSON data at `/stats.json`
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Also see [bittorrent-dht](https://github.com/feross/bittorrent-dht).
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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')
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var requiredOpts = {
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infoHash: new Buffer('012345678901234567890'), // hex string or Buffer
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peerId: new Buffer('01234567890123456789'), // hex string or Buffer
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announce: [], // list of tracker server urls
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port: 6881 // torrent client port, (in browser, optional)
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}
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var optionalOpts = {
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// RTCPeerConnection config object (only used in browser)
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rtcConfig: {},
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// custom webrtc impl, useful in node to specify [wrtc](https://npmjs.com/package/wrtc)
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wrtc: {},
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getAnnounceOpts: function () {
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// provide a callback that will be called whenever announce() is called
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// internally (on timer), or by the user
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return {
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uploaded: 0,
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downloaded: 0,
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left: 0,
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customParam: 'blah' // custom parameters supported
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}
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}
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}
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var client = new Client(requiredOpts)
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client.on('error', function (err) {
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// fatal client error!
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console.log(err.message)
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})
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client.on('warning', function (err) {
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// a tracker was unavailable or sent bad data to the client. you can probably ignore it
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console.log(err.message)
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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 an announce response from tracker: ' + data.announce)
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console.log('number of seeders in the swarm: ' + data.complete)
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console.log('number of leechers in the swarm: ' + 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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// provide parameters to the tracker
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client.update({
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uploaded: 0,
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downloaded: 0,
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left: 0,
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customParam: 'blah' // custom parameters supported
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})
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// stop getting peers from the tracker, gracefully leave the swarm
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client.stop()
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// ungracefully leave the swarm (without sending final 'stop' message)
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client.destroy()
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// scrape
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client.scrape()
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client.on('scrape', function (data) {
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console.log('got a scrape response from tracker: ' + data.announce)
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console.log('number of seeders in the swarm: ' + data.complete)
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console.log('number of leechers in the swarm: ' + data.incomplete)
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console.log('number of total downloads of this torrent: ' + data.downloaded)
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})
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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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udp: true, // enable udp server? [default=true]
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http: true, // enable http server? [default=true]
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ws: true, // enable websocket server? [default=true]
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stats: true, // enable web-based statistics? [default=true]
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filter: function (infoHash, params, cb) {
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// Blacklist/whitelist function for allowing/disallowing torrents. If this option is
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// omitted, all torrents are allowed. It is possible to interface with a database or
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// external system before deciding to allow/deny, because this function is async.
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// It is possible to block by peer id (whitelisting torrent clients) or by secret
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// key (private trackers). Full access to the original HTTP/UDP request parameters
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// are available in `params`.
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// This example only allows one torrent.
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var allowed = (infoHash === 'aaa67059ed6bd08362da625b3ae77f6f4a075aaa')
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cb(allowed)
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// In addition to returning a boolean (`true` for allowed, `false` for disallowed),
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// you can return an `Error` object to disallow and provide a custom reason.
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}
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})
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// Internal http, udp, and websocket servers exposed as public properties.
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server.http
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server.udp
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server.ws
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server.on('error', function (err) {
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// fatal server error!
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console.log(err.message)
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})
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server.on('warning', function (err) {
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// client sent bad data. probably not a problem, just a buggy client.
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console.log(err.message)
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})
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server.on('listening', function () {
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// fired when all requested servers are listening
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console.log('listening on http port:' + server.http.address().port)
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console.log('listening on udp port:' + server.udp.address().port)
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})
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// start tracker server listening! Use 0 to listen on a random free port.
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server.listen(port, hostname, onlistening)
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// listen for individual tracker messages from peers:
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server.on('start', function (addr) {
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console.log('got start message from ' + addr)
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})
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server.on('complete', function (addr) {})
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server.on('update', function (addr) {})
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server.on('stop', function (addr) {})
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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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The http server will handle requests for the following paths: `/announce`, `/scrape`. Requests for other paths will not be handled.
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## multi scrape
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Scraping multiple torrent info is possible with a static `Client.scrape` method:
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```js
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var Client = require('bittorrent-tracker')
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Client.scrape(announceUrl, [ infoHash1, infoHash2 ], function (err, results) {
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results[infoHash1].announce
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results[infoHash1].infoHash
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results[infoHash1].complete
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results[infoHash1].incomplete
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results[infoHash1].downloaded
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// ...
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})
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````
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## command line
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Easily start a tracker server:
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```sh
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$ bittorrent-tracker
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http server listening on 8000
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udp server listening on 8000
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ws server listening on 8000
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```
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Lots of options:
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```sh
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$ bittorrent-tracker --help
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bittorrent-tracker - Start a bittorrent tracker server
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Usage:
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bittorrent-tracker [OPTIONS]
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If no --http, --udp, or --ws option is supplied, all tracker types will be started.
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Options:
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-p, --port [number] change the port [default: 8000]
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--trust-proxy trust 'x-forwarded-for' header from reverse proxy
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--interval client announce interval (ms) [default: 600000]
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--http enable http server
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--udp enable udp server
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--ws enable websocket server
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-q, --quiet only show error output
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-s, --silent show no output
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-v, --version print the current version
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Please report bugs! https://github.com/feross/bittorrent-tracker/issues
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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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