mirror of
https://github.com/webtorrent/bittorrent-tracker.git
synced 2024-12-13 19:06:27 +00:00
Merge pull request #45 from feross/refactor
Refactor the server-side code
This commit is contained in:
Feross Aboukhadijeh
commit
20cb18272e
@ -4,9 +4,18 @@
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var querystring = require('querystring')
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exports.NUM_ANNOUNCE_PEERS = 50
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exports.MAX_ANNOUNCE_PEERS = 82
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exports.CONNECTION_ID = Buffer.concat([ toUInt32(0x417), toUInt32(0x27101980) ])
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exports.ACTIONS = { CONNECT: 0, ANNOUNCE: 1, SCRAPE: 2, ERROR: 3 }
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exports.EVENTS = { update: 0, completed: 1, started: 2, stopped: 3 }
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exports.EVENT_IDS = {
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0: 'update',
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1: 'completed',
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2: 'started',
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3: 'stopped'
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};
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function toUInt32 (n) {
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var buf = new Buffer(4)
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58
lib/parse_http.js
Normal file
58
lib/parse_http.js
Normal file
@ -0,0 +1,58 @@
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var common = require('./common')
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var REMOVE_IPV6_RE = /^::ffff:/
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module.exports = parseHttpRequest
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function parseHttpRequest (req, options) {
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var s = req.url.split('?')
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var params = common.querystringParse(s[1])
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if (s[0] === '/announce') {
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params.action = common.ACTIONS.ANNOUNCE
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params.peer_id = typeof params.peer_id === 'string' && common.binaryToUtf8(params.peer_id)
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params.port = Number(params.port)
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if (typeof params.info_hash !== 'string') throw new Error('invalid info_hash')
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if (params.info_hash.length !== 20) throw new Error('invalid info_hash length')
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if (typeof params.peer_id !== 'string') throw new Error('invalid peer_id')
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if (params.peer_id.length !== 20) throw new Error('invalid peer_id length')
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if (!params.port) throw new Error('invalid port')
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params.left = Number(params.left)
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params.compact = Number(params.compact)
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params.ip = options.trustProxy
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? req.headers['x-forwarded-for'] || req.connection.remoteAddress
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: req.connection.remoteAddress.replace(REMOVE_IPV6_RE, '') // force ipv4
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params.addr = params.ip + ':' + params.port // TODO: ipv6 brackets?
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params.numwant = Math.min(
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Number(params.numwant) || common.NUM_ANNOUNCE_PEERS,
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common.MAX_ANNOUNCE_PEERS
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)
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return params
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} else if (s[0] === '/scrape') { // unofficial scrape message
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params.action = common.ACTIONS.SCRAPE
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if (typeof params.info_hash === 'string') {
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params.info_hash = [ params.info_hash ]
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}
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if (params.info_hash) {
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if (!Array.isArray(params.info_hash)) throw new Error('invalid info_hash array')
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params.info_hash.forEach(function (infoHash) {
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if (infoHash.length !== 20) {
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throw new Error('invalid info_hash')
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}
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})
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}
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return params
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} else {
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return null
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}
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}
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80
lib/parse_udp.js
Normal file
80
lib/parse_udp.js
Normal file
@ -0,0 +1,80 @@
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var bufferEqual = require('buffer-equal')
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var ipLib = require('ip')
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var common = require('./common')
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module.exports = parseUdpRequest
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function parseUdpRequest (msg, rinfo) {
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if (msg.length < 16) {
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throw new Error('received packet is too short')
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}
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if (rinfo.family !== 'IPv4') {
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throw new Error('udp tracker does not support IPv6')
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}
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var params = {
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connectionId: msg.slice(0, 8), // 64-bit
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action: msg.readUInt32BE(8),
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transactionId: msg.readUInt32BE(12)
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}
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// TODO: randomize:
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if (!bufferEqual(params.connectionId, common.CONNECTION_ID)) {
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throw new Error('received packet with invalid connection id')
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}
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if (params.action === common.ACTIONS.CONNECT) {
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// No further params
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} else if (params.action === common.ACTIONS.ANNOUNCE) {
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params.info_hash = msg.slice(16, 36).toString('binary') // 20 bytes
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params.peer_id = msg.slice(36, 56).toString('utf8') // 20 bytes
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params.downloaded = fromUInt64(msg.slice(56, 64)) // TODO: track this?
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params.left = fromUInt64(msg.slice(64, 72))
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params.uploaded = fromUInt64(msg.slice(72, 80)) // TODO: track this?
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params.event = msg.readUInt32BE(80)
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params.event = common.EVENT_IDS[params.event]
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if (!params.event) throw new Error('invalid event') // early return
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params.ip = msg.readUInt32BE(84) // optional
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params.ip = params.ip ?
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ipLib.toString(params.ip) :
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rinfo.address
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params.key = msg.readUInt32BE(88) // TODO: what is this for?
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params.numwant = msg.readUInt32BE(92) // optional
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// never send more than MAX_ANNOUNCE_PEERS or else the UDP packet will get bigger than
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// 512 bytes which is not safe
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params.numwant = Math.min(params.numwant || common.NUM_ANNOUNCE_PEERS, common.MAX_ANNOUNCE_PEERS)
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params.port = msg.readUInt16BE(96) || rinfo.port // optional
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params.addr = params.ip + ':' + params.port // TODO: ipv6 brackets
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params.compact = 1 // udp is always compact
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} else if (params.action === common.ACTIONS.SCRAPE) { // scrape message
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params.info_hash = msg.slice(16, 36).toString('binary') // 20 bytes
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// TODO: support multiple info_hash scrape
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if (msg.length > 36) {
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throw new Error('multiple info_hash scrape not supported')
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}
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} else {
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throw new Error('Invalid action in UDP packet: ' + params.action)
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}
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return params
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}
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// HELPER FUNCTIONS
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var TWO_PWR_32 = (1 << 16) * 2
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/**
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* Return the closest floating-point representation to the buffer value. Precision will be
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* lost for big numbers.
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*/
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function fromUInt64 (buf) {
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var high = buf.readUInt32BE(0) | 0 // force
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var low = buf.readUInt32BE(4) | 0
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var lowUnsigned = (low >= 0) ? low : TWO_PWR_32 + low
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return high * TWO_PWR_32 + lowUnsigned
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}
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118
lib/swarm.js
Normal file
118
lib/swarm.js
Normal file
@ -0,0 +1,118 @@
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var debug = require('debug')('bittorrent-tracker')
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module.exports = Swarm
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// Regard this as the default implementation of an interface that you
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// need to support when overriding Server.getSwarm()
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function Swarm (infoHash, server) {
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this.peers = {}
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this.complete = 0
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this.incomplete = 0
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this.emit = server.emit.bind(server)
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}
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Swarm.prototype.announce = function (params, cb) {
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var self = this
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var peer = self.peers[params.addr]
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// Dispatch announce event
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if (!params.event || params.event === 'empty') params.event = 'update'
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var fn = '_onAnnounce_' + params.event
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if (self[fn]) {
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self[fn](params, peer, function (err) {
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// event processed, prepare response:
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if (params.left === 0 && peer) peer.complete = true
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// send peers
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var peers = self._getPeers(params.numwant)
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cb(null, {
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complete: self.complete,
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incomplete: self.incomplete,
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peers: peers
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})
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})
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} else {
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cb(new Error('invalid event'))
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}
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}
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Swarm.prototype._onAnnounce_started = function (params, peer, cb) {
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if (peer) {
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debug('unexpected `started` event from peer that is already in swarm')
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return this._onAnnounce_update() // treat as an update
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}
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if (params.left === 0) this.complete += 1
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else this.incomplete += 1
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peer = this.peers[params.addr] = {
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ip: params.ip,
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port: params.port,
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peerId: params.peer_id
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}
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this.emit('start', params.addr)
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cb()
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}
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Swarm.prototype._onAnnounce_stopped = function (params, peer, cb) {
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if (!peer) {
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debug('unexpected `stopped` event from peer that is not in swarm')
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return // do nothing
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}
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if (peer.complete) this.complete -= 1
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else this.incomplete -= 1
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this.peers[params.addr] = null
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this.emit('stop', params.addr)
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cb()
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}
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Swarm.prototype._onAnnounce_completed = function (params, peer, cb) {
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if (!peer) {
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debug('unexpected `completed` event from peer that is not in swarm')
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return start() // treat as a start
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}
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if (peer.complete) {
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debug('unexpected `completed` event from peer that is already marked as completed')
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return // do nothing
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}
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this.complete += 1
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this.incomplete -= 1
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peer.complete = true
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this.emit('complete', params.addr)
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cb()
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}
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Swarm.prototype._onAnnounce_update = function (params, peer, cb) {
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if (!peer) {
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debug('unexpected `update` event from peer that is not in swarm')
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return start() // treat as a start
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}
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this.emit('update', params.addr)
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cb()
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}
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Swarm.prototype._getPeers = function (numwant) {
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var peers = []
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for (var peerId in this.peers) {
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if (peers.length >= numwant) break
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var peer = this.peers[peerId]
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if (!peer) continue // ignore null values
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peers.push({
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'peer id': peer.peerId,
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ip: peer.ip,
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port: peer.port
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})
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}
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return peers
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}
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Swarm.prototype.scrape = function (infoHash, params, cb) {
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cb(null, {
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complete: this.complete,
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incomplete: this.incomplete
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})
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}
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@ -26,6 +26,7 @@
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"ip": "^0.3.0",
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"once": "^1.3.0",
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"portfinder": "^0.2.1",
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"run-series": "^1.0.2",
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"string2compact": "^1.1.1"
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},
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"devDependencies": {
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533
server.js
533
server.js
@ -1,23 +1,23 @@
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module.exports = Server
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var bencode = require('bencode')
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var bufferEqual = require('buffer-equal')
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var common = require('./lib/common')
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var debug = require('debug')('bittorrent-tracker')
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var dgram = require('dgram')
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var EventEmitter = require('events').EventEmitter
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var http = require('http')
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var inherits = require('inherits')
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var ipLib = require('ip')
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var portfinder = require('portfinder')
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var series = require('run-series')
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var string2compact = require('string2compact')
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var common = require('./lib/common')
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var Swarm = require('./lib/swarm')
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var parseHttpRequest = require('./lib/parse_http')
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var parseUdpRequest = require('./lib/parse_udp')
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// Use random port above 1024
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portfinder.basePort = Math.floor(Math.random() * 60000) + 1025
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var NUM_ANNOUNCE_PEERS = 50
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var MAX_ANNOUNCE_PEERS = 82
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var REMOVE_IPV6_RE = /^::ffff:/
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inherits(Server, EventEmitter)
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@ -115,410 +115,209 @@ Server.prototype.close = function (cb) {
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}
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}
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Server.prototype.getSwarm = function (infoHash) {
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var self = this
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var binaryInfoHash = Buffer.isBuffer(infoHash)
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? infoHash.toString('binary')
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: new Buffer(infoHash, 'hex').toString('binary')
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return self._getSwarm(binaryInfoHash)
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}
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Server.prototype._getSwarm = function (binaryInfoHash) {
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Server.prototype.getSwarm = function (binaryInfoHash) {
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var self = this
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if (Buffer.isBuffer(binaryInfoHash)) binaryInfoHash = binaryInfoHash.toString('binary')
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var swarm = self.torrents[binaryInfoHash]
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if (!swarm) {
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swarm = self.torrents[binaryInfoHash] = {
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complete: 0,
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incomplete: 0,
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peers: {}
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}
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swarm = self.torrents[binaryInfoHash] = new Swarm(binaryInfoHash, this)
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}
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return swarm
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}
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Server.prototype._onHttpRequest = function (req, res) {
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var self = this
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var s = req.url.split('?')
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var params = common.querystringParse(s[1])
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var response
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if (s[0] === '/announce') {
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var infoHash = typeof params.info_hash === 'string' && params.info_hash
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var peerId = typeof params.peer_id === 'string' && common.binaryToUtf8(params.peer_id)
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var port = Number(params.port)
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if (!infoHash) return error('invalid info_hash')
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if (infoHash.length !== 20) return error('invalid info_hash')
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if (!peerId) return error('invalid peer_id')
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if (peerId.length !== 20) return error('invalid peer_id')
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if (!port) return error('invalid port')
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var left = Number(params.left)
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var compact = Number(params.compact)
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var ip = self._trustProxy
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? req.headers['x-forwarded-for'] || req.connection.remoteAddress
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: req.connection.remoteAddress.replace(REMOVE_IPV6_RE, '') // force ipv4
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var addr = ip + ':' + port
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var swarm = self._getSwarm(infoHash)
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var peer = swarm.peers[addr]
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var numWant = Math.min(
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Number(params.numwant) || NUM_ANNOUNCE_PEERS,
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MAX_ANNOUNCE_PEERS
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)
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var start = function () {
|
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if (peer) {
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debug('unexpected `started` event from peer that is already in swarm')
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return update() // treat as an update
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}
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if (left === 0) swarm.complete += 1
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else swarm.incomplete += 1
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peer = swarm.peers[addr] = {
|
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ip: ip,
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port: port,
|
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peerId: peerId
|
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}
|
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self.emit('start', addr)
|
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var error
|
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var params
|
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try {
|
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params = parseHttpRequest(req, {
|
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trustProxy: self._trustProxy
|
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})
|
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} catch (err) {
|
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error = err
|
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}
|
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|
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var stop = function () {
|
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if (!peer) {
|
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debug('unexpected `stopped` event from peer that is not in swarm')
|
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return // do nothing
|
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}
|
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if (peer.complete) swarm.complete -= 1
|
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else swarm.incomplete -= 1
|
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swarm.peers[addr] = null
|
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self.emit('stop', addr)
|
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if (!error && !params) error = new Error('Empty HTTP parameters')
|
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if (error) {
|
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debug('sent error %s', error.message)
|
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res.end(bencode.encode({
|
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'failure reason': error.message
|
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}))
|
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|
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// even though it's an error for the client, it's just a warning for the server.
|
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// don't crash the server because a client sent bad data :)
|
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self.emit('warning', error)
|
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|
||||
return
|
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}
|
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|
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var complete = function () {
|
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if (!peer) {
|
||||
debug('unexpected `completed` event from peer that is not in swarm')
|
||||
return start() // treat as a start
|
||||
}
|
||||
if (peer.complete) {
|
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debug('unexpected `completed` event from peer that is already marked as completed')
|
||||
return // do nothing
|
||||
}
|
||||
swarm.complete += 1
|
||||
swarm.incomplete -= 1
|
||||
peer.complete = true
|
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self.emit('complete', addr)
|
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}
|
||||
|
||||
var update = function () {
|
||||
if (!peer) {
|
||||
debug('unexpected `update` event from peer that is not in swarm')
|
||||
return start() // treat as a start
|
||||
}
|
||||
self.emit('update', addr)
|
||||
}
|
||||
|
||||
switch (params.event) {
|
||||
case 'started':
|
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start()
|
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break
|
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case 'stopped':
|
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stop()
|
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break
|
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case 'completed':
|
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complete()
|
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break
|
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case '': case undefined: // update
|
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update()
|
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break
|
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default:
|
||||
return error('invalid event') // early return
|
||||
}
|
||||
|
||||
if (left === 0 && peer) peer.complete = true
|
||||
|
||||
// send peers
|
||||
var peers = compact === 1
|
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? self._getPeersCompact(swarm, numWant)
|
||||
: self._getPeers(swarm, numWant)
|
||||
|
||||
this._onRequest(params, function (err, response) {
|
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if (err) {
|
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self.emit('warning', err)
|
||||
response = {
|
||||
complete: swarm.complete,
|
||||
incomplete: swarm.incomplete,
|
||||
peers: peers,
|
||||
interval: self._intervalMs
|
||||
'failure reason': err.message
|
||||
}
|
||||
}
|
||||
|
||||
delete response.action // only needed for UDP encoding
|
||||
res.end(bencode.encode(response))
|
||||
debug('sent response %s', response)
|
||||
})
|
||||
}
|
||||
|
||||
Server.prototype._onUdpRequest = function (msg, rinfo) {
|
||||
var self = this
|
||||
|
||||
var params
|
||||
try {
|
||||
params = parseUdpRequest(msg, rinfo)
|
||||
} catch (err) {
|
||||
self.emit('warning', err)
|
||||
// Do not reply for parsing errors
|
||||
return
|
||||
}
|
||||
|
||||
// Handle
|
||||
this._onRequest(params, function (err, response) {
|
||||
if (err) {
|
||||
self.emit('warning', err)
|
||||
response = {
|
||||
action: common.ACTIONS.ERRROR,
|
||||
'failure reason': err.message
|
||||
}
|
||||
}
|
||||
|
||||
var socket = dgram.createSocket('udp4')
|
||||
response.transactionId = params.transactionId
|
||||
response.connectionId = params.connectionId
|
||||
var buf = makeUdpPacket(response)
|
||||
socket.send(buf, 0, buf.length, rinfo.port, rinfo.address, function () {
|
||||
try {
|
||||
socket.close()
|
||||
} catch (err) {}
|
||||
})
|
||||
})
|
||||
}
|
||||
|
||||
Server.prototype._onRequest = function (params, cb) {
|
||||
var response
|
||||
if (params && params.action === common.ACTIONS.CONNECT) {
|
||||
cb(null, { action: common.ACTIONS.CONNECT })
|
||||
} else if (params && params.action === common.ACTIONS.ANNOUNCE) {
|
||||
this._onAnnounce(params, cb)
|
||||
} else if (params && params.action === common.ACTIONS.SCRAPE) {
|
||||
this._onScrape(params, cb)
|
||||
} else {
|
||||
cb(new Error('Invalid action'))
|
||||
}
|
||||
}
|
||||
|
||||
Server.prototype._onAnnounce = function (params, cb) {
|
||||
var self = this
|
||||
var swarm = self.getSwarm(params.info_hash)
|
||||
swarm.announce(params, function (err, response) {
|
||||
if (response) {
|
||||
if (!response.action) response.action = common.ACTIONS.ANNOUNCE
|
||||
if (!response.intervalMs) response.intervalMs = self._intervalMs
|
||||
if (params.compact === 1) {
|
||||
response.peers = string2compact(response.peers.map(function (peer) {
|
||||
return peer.ip + ':' + peer.port // TODO: ipv6 brackets
|
||||
}))
|
||||
}
|
||||
}
|
||||
cb(err, response)
|
||||
})
|
||||
}
|
||||
|
||||
Server.prototype._onScrape = function (params, cb) {
|
||||
var self = this
|
||||
|
||||
} else if (s[0] === '/scrape') { // unofficial scrape message
|
||||
if (typeof params.info_hash === 'string') {
|
||||
params.info_hash = [ params.info_hash ]
|
||||
} else if (params.info_hash == null) {
|
||||
// if info_hash param is omitted, stats for all torrents are returned
|
||||
// TODO: make this configurable!
|
||||
params.info_hash = Object.keys(self.torrents)
|
||||
}
|
||||
|
||||
if (!Array.isArray(params.info_hash)) return error('invalid info_hash')
|
||||
if (!Array.isArray(params.info_hash)) {
|
||||
var err = new Error('invalid info_hash')
|
||||
self.emit('warning', err)
|
||||
return cb(err)
|
||||
}
|
||||
|
||||
response = {
|
||||
var response = {
|
||||
action: common.ACTIONS.SCRAPE,
|
||||
files: {},
|
||||
flags: {
|
||||
min_request_interval: self._intervalMs
|
||||
}
|
||||
}
|
||||
|
||||
params.info_hash.some(function (infoHash) {
|
||||
if (infoHash.length !== 20) {
|
||||
error('invalid info_hash')
|
||||
return true // early return
|
||||
series(params.info_hash.map(function (infoHash) {
|
||||
var swarm = self.getSwarm(infoHash)
|
||||
return function (cb) {
|
||||
swarm.scrape(infoHash, params, function (err, scrapeInfo) {
|
||||
cb(err, scrapeInfo && {
|
||||
infoHash: infoHash,
|
||||
complete: scrapeInfo.complete || 0,
|
||||
incomplete: scrapeInfo.incomplete || 0
|
||||
})
|
||||
})
|
||||
}
|
||||
}), function (err, results) {
|
||||
if (err) return cb(err)
|
||||
|
||||
var swarm = self._getSwarm(infoHash)
|
||||
|
||||
response.files[infoHash] = {
|
||||
complete: swarm.complete,
|
||||
incomplete: swarm.incomplete,
|
||||
downloaded: swarm.complete // TODO: this only provides a lower-bound
|
||||
results.forEach(function (result) {
|
||||
response.files[result.infoHash] = {
|
||||
complete: result.complete,
|
||||
incomplete: result.incomplete,
|
||||
downloaded: result.complete // TODO: this only provides a lower-bound
|
||||
}
|
||||
})
|
||||
|
||||
res.end(bencode.encode(response))
|
||||
debug('sent response %s', response)
|
||||
|
||||
} else {
|
||||
error('only /announce and /scrape are valid endpoints')
|
||||
}
|
||||
|
||||
function error (message) {
|
||||
debug('sent error %s', message)
|
||||
res.end(bencode.encode({
|
||||
'failure reason': message
|
||||
}))
|
||||
|
||||
// even though it's an error for the client, it's just a warning for the server.
|
||||
// don't crash the server because a client sent bad data :)
|
||||
self.emit('warning', new Error(message))
|
||||
}
|
||||
cb(null, response)
|
||||
})
|
||||
}
|
||||
|
||||
Server.prototype._onUdpRequest = function (msg, rinfo) {
|
||||
var self = this
|
||||
|
||||
if (msg.length < 16) {
|
||||
return error('received packet is too short')
|
||||
}
|
||||
|
||||
if (rinfo.family !== 'IPv4') {
|
||||
return error('udp tracker does not support IPv6')
|
||||
}
|
||||
|
||||
var connectionId = msg.slice(0, 8) // 64-bit
|
||||
var action = msg.readUInt32BE(8)
|
||||
var transactionId = msg.readUInt32BE(12)
|
||||
|
||||
if (!bufferEqual(connectionId, common.CONNECTION_ID)) {
|
||||
return error('received packet with invalid connection id')
|
||||
}
|
||||
|
||||
var socket = dgram.createSocket('udp4')
|
||||
|
||||
var infoHash, swarm
|
||||
if (action === common.ACTIONS.CONNECT) {
|
||||
send(Buffer.concat([
|
||||
function makeUdpPacket (params) {
|
||||
switch (params.action) {
|
||||
case common.ACTIONS.CONNECT:
|
||||
return Buffer.concat([
|
||||
common.toUInt32(common.ACTIONS.CONNECT),
|
||||
common.toUInt32(transactionId),
|
||||
connectionId
|
||||
]))
|
||||
} else if (action === common.ACTIONS.ANNOUNCE) {
|
||||
infoHash = msg.slice(16, 36).toString('binary') // 20 bytes
|
||||
var peerId = msg.slice(36, 56).toString('utf8') // 20 bytes
|
||||
var downloaded = fromUInt64(msg.slice(56, 64)) // TODO: track this?
|
||||
var left = fromUInt64(msg.slice(64, 72))
|
||||
var uploaded = fromUInt64(msg.slice(72, 80)) // TODO: track this?
|
||||
var event = msg.readUInt32BE(80)
|
||||
var ip = msg.readUInt32BE(84) // optional
|
||||
var key = msg.readUInt32BE(88) // TODO: what is this for?
|
||||
var numWant = msg.readUInt32BE(92) // optional
|
||||
var port = msg.readUInt16BE(96) // optional
|
||||
|
||||
if (ip) {
|
||||
ip = ipLib.toString(ip)
|
||||
} else {
|
||||
ip = rinfo.address
|
||||
}
|
||||
|
||||
if (!port) {
|
||||
port = rinfo.port
|
||||
}
|
||||
|
||||
var addr = ip + ':' + port
|
||||
|
||||
swarm = self._getSwarm(infoHash)
|
||||
var peer = swarm.peers[addr]
|
||||
|
||||
// never send more than MAX_ANNOUNCE_PEERS or else the UDP packet will get bigger than
|
||||
// 512 bytes which is not safe
|
||||
numWant = Math.min(numWant || NUM_ANNOUNCE_PEERS, MAX_ANNOUNCE_PEERS)
|
||||
|
||||
var start = function () {
|
||||
if (peer) {
|
||||
debug('unexpected `started` event from peer that is already in swarm')
|
||||
return update() // treat as an update
|
||||
}
|
||||
if (left === 0) swarm.complete += 1
|
||||
else swarm.incomplete += 1
|
||||
peer = swarm.peers[addr] = {
|
||||
ip: ip,
|
||||
port: port,
|
||||
peerId: peerId
|
||||
}
|
||||
self.emit('start', addr)
|
||||
}
|
||||
|
||||
var stop = function () {
|
||||
if (!peer) {
|
||||
debug('unexpected `stopped` event from peer that is not in swarm')
|
||||
return // do nothing
|
||||
}
|
||||
if (peer.complete) swarm.complete -= 1
|
||||
else swarm.incomplete -= 1
|
||||
swarm.peers[addr] = null
|
||||
self.emit('stop', addr)
|
||||
}
|
||||
|
||||
var complete = function () {
|
||||
if (!peer) {
|
||||
debug('unexpected `completed` event from peer that is not in swarm')
|
||||
return start() // treat as a start
|
||||
}
|
||||
if (peer.complete) {
|
||||
debug('unexpected `completed` event from peer that is already marked as completed')
|
||||
return // do nothing
|
||||
}
|
||||
swarm.complete += 1
|
||||
swarm.incomplete -= 1
|
||||
peer.complete = true
|
||||
self.emit('complete', addr)
|
||||
}
|
||||
|
||||
var update = function () {
|
||||
if (!peer) {
|
||||
debug('unexpected `update` event from peer that is not in swarm')
|
||||
return start() // treat as a start
|
||||
}
|
||||
self.emit('update', addr)
|
||||
}
|
||||
|
||||
switch (event) {
|
||||
case common.EVENTS.started:
|
||||
start()
|
||||
break
|
||||
case common.EVENTS.stopped:
|
||||
stop()
|
||||
break
|
||||
case common.EVENTS.completed:
|
||||
complete()
|
||||
break
|
||||
case common.EVENTS.update: // update
|
||||
update()
|
||||
break
|
||||
default:
|
||||
return error('invalid event') // early return
|
||||
}
|
||||
|
||||
if (left === 0 && peer) peer.complete = true
|
||||
|
||||
// send peers
|
||||
var peers = self._getPeersCompact(swarm, numWant)
|
||||
|
||||
send(Buffer.concat([
|
||||
common.toUInt32(params.transactionId),
|
||||
params.connectionId
|
||||
])
|
||||
case common.ACTIONS.ANNOUNCE:
|
||||
return Buffer.concat([
|
||||
common.toUInt32(common.ACTIONS.ANNOUNCE),
|
||||
common.toUInt32(transactionId),
|
||||
common.toUInt32(self._intervalMs),
|
||||
common.toUInt32(swarm.incomplete),
|
||||
common.toUInt32(swarm.complete),
|
||||
peers
|
||||
]))
|
||||
|
||||
} else if (action === common.ACTIONS.SCRAPE) { // scrape message
|
||||
infoHash = msg.slice(16, 36).toString('binary') // 20 bytes
|
||||
|
||||
// TODO: support multiple info_hash scrape
|
||||
if (msg.length > 36) {
|
||||
error('multiple info_hash scrape not supported')
|
||||
}
|
||||
|
||||
swarm = self._getSwarm(infoHash)
|
||||
|
||||
send(Buffer.concat([
|
||||
common.toUInt32(params.transactionId),
|
||||
common.toUInt32(params.intervalMs),
|
||||
common.toUInt32(params.incomplete),
|
||||
common.toUInt32(params.complete),
|
||||
params.peers
|
||||
])
|
||||
case common.ACTIONS.SCRAPE:
|
||||
var firstInfoHash = Object.keys(params.files)[0]
|
||||
var scrapeInfo = firstInfoHash ? {
|
||||
complete: params.files[firstInfoHash].complete,
|
||||
incomplete: params.files[firstInfoHash].incomplete,
|
||||
completed: params.files[firstInfoHash].complete // TODO: this only provides a lower-bound
|
||||
} : {}
|
||||
return Buffer.concat([
|
||||
common.toUInt32(common.ACTIONS.SCRAPE),
|
||||
common.toUInt32(transactionId),
|
||||
common.toUInt32(swarm.complete),
|
||||
common.toUInt32(swarm.complete), // TODO: this only provides a lower-bound
|
||||
common.toUInt32(swarm.incomplete)
|
||||
]))
|
||||
}
|
||||
|
||||
function send (buf) {
|
||||
debug('sent response %s', buf.toString('hex'))
|
||||
socket.send(buf, 0, buf.length, rinfo.port, rinfo.address, function () {
|
||||
try {
|
||||
socket.close()
|
||||
} catch (err) {}
|
||||
})
|
||||
}
|
||||
|
||||
function error (message) {
|
||||
debug('sent error %s', message)
|
||||
send(Buffer.concat([
|
||||
common.toUInt32(params.transactionId),
|
||||
common.toUInt32(scrapeInfo.complete),
|
||||
common.toUInt32(scrapeInfo.completed),
|
||||
common.toUInt32(scrapeInfo.incomplete)
|
||||
])
|
||||
case common.ACTIONS.ERROR:
|
||||
return Buffer.concat([
|
||||
common.toUInt32(common.ACTIONS.ERROR),
|
||||
common.toUInt32(transactionId || 0),
|
||||
new Buffer(message, 'utf8')
|
||||
]))
|
||||
self.emit('warning', new Error(message))
|
||||
common.toUInt32(params.transactionId || 0),
|
||||
new Buffer(params.message, 'utf8')
|
||||
])
|
||||
default:
|
||||
throw new Error('Action not implemented: ' + params.action)
|
||||
}
|
||||
}
|
||||
|
||||
Server.prototype._getPeers = function (swarm, numWant) {
|
||||
var peers = []
|
||||
for (var peerId in swarm.peers) {
|
||||
if (peers.length >= numWant) break
|
||||
var peer = swarm.peers[peerId]
|
||||
if (!peer) continue // ignore null values
|
||||
peers.push({
|
||||
'peer id': peer.peerId,
|
||||
ip: peer.ip,
|
||||
port: peer.port
|
||||
})
|
||||
}
|
||||
return peers
|
||||
}
|
||||
|
||||
Server.prototype._getPeersCompact = function (swarm, numWant) {
|
||||
var peers = []
|
||||
|
||||
for (var peerId in swarm.peers) {
|
||||
if (peers.length >= numWant) break
|
||||
var peer = swarm.peers[peerId]
|
||||
if (!peer) continue // ignore null values
|
||||
peers.push(peer.ip + ':' + peer.port)
|
||||
}
|
||||
|
||||
return string2compact(peers)
|
||||
}
|
||||
|
||||
// HELPER FUNCTIONS
|
||||
|
||||
var TWO_PWR_32 = (1 << 16) * 2
|
||||
|
||||
/**
|
||||
* Return the closest floating-point representation to the buffer value. Precision will be
|
||||
* lost for big numbers.
|
||||
*/
|
||||
function fromUInt64 (buf) {
|
||||
var high = buf.readUInt32BE(0) | 0 // force
|
||||
var low = buf.readUInt32BE(4) | 0
|
||||
var lowUnsigned = (low >= 0) ? low : TWO_PWR_32 + low
|
||||
|
||||
return high * TWO_PWR_32 + lowUnsigned
|
||||
}
|
||||
|
||||
@ -2,7 +2,7 @@ var Client = require('../')
|
||||
var Server = require('../').Server
|
||||
var test = require('tape')
|
||||
|
||||
var infoHash = '4cb67059ed6bd08362da625b3ae77f6f4a075705'
|
||||
var infoHash = new Buffer('4cb67059ed6bd08362da625b3ae77f6f4a075705', 'hex')
|
||||
var peerId = '01234567890123456789'
|
||||
var peerId2 = '12345678901234567890'
|
||||
var torrentLength = 50000
|
||||
|
||||
Loading…
Reference in New Issue
Block a user