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https://github.com/webtorrent/bittorrent-tracker.git
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server: split out _onRequest() et al
This commit is contained in:
Astro
parent
85be917d51
commit
366b49bf06
286
server.js
286
server.js
@ -158,8 +158,72 @@ Server.prototype._onHttpRequest = function (req, res) {
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return
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}
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this._onRequest(params, function (err, response) {
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if (err) {
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self.emit('warning', new Error(err.message))
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response = {
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action: common.ACTIONS.ERRROR,
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'failure reason': err.message
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}
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}
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res.end(bencode.encode(response))
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})
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}
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Server.prototype._onUdpRequest = function (msg, rinfo) {
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var self = this
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var params
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try {
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params = parseUdpRequest(msg, rinfo)
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} catch (err) {
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self.emit('warning', err)
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// Do not reply for parsing errors
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return
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}
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// Do nothing with invalid request
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if (!params) return
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// Handle
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this._onRequest(params, function (err, response) {
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if (err) {
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self.emit('warning', new Error(err.message))
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response = {
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action: common.ACTIONS.ERRROR,
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'failure reason': err.message
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}
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}
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var socket = dgram.createSocket('udp4')
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response.transactionId = params.transactionId
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response.connectionId = params.connectionId
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var buf = makeUdpPacket(response)
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socket.send(buf, 0, buf.length, rinfo.port, rinfo.address, function () {
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try {
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socket.close()
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} catch (err) {}
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})
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})
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}
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Server.prototype._onRequest = function (params, cb) {
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var response
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if (params && params.action === common.ACTIONS.ANNOUNCE) {
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if (params && params.action === common.ACTIONS.CONNECT) {
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cb(null, { action: common.ACTIONS.CONNECT })
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} else if (params && params.action === common.ACTIONS.ANNOUNCE) {
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this._onAnnounce(params, cb)
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} else if (params && params.action === common.ACTIONS.SCRAPE) {
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this._onScrape(params, cb)
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} else {
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cb(new Error('Invalid action'))
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}
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}
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Server.prototype._onAnnounce = function (params, cb) {
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var self = this
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var swarm = self._getSwarm(params.info_hash)
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var peer = swarm.peers[params.addr]
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@ -222,11 +286,11 @@ Server.prototype._onHttpRequest = function (req, res) {
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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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case '': case undefined: case 'empty': case 'update': // update
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update()
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break
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default:
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return error('invalid event') // early return
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return cb(new Error('invalid event')) // early return
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}
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if (params.left === 0 && peer) peer.complete = true
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@ -236,17 +300,18 @@ Server.prototype._onHttpRequest = function (req, res) {
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? self._getPeersCompact(swarm, params.numwant)
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: self._getPeers(swarm, params.numwant)
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response = {
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cb(null, {
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action: common.ACTIONS.ANNOUNCE,
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complete: swarm.complete,
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incomplete: swarm.incomplete,
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peers: peers,
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interval: self._intervalMs
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intervalMs: self._intervalMs
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})
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}
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res.end(bencode.encode(response))
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debug('sent response %s', response)
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Server.prototype._onScrape = function (params, cb) {
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var self = this
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} else if (params.action === common.ACTIONS.SCRAPE) { // unofficial scrape message
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if (typeof params.info_hash === 'string') {
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params.info_hash = [ params.info_hash ]
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} else if (params.info_hash == null) {
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@ -255,9 +320,14 @@ Server.prototype._onHttpRequest = function (req, res) {
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params.info_hash = Object.keys(self.torrents)
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}
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if (!Array.isArray(params.info_hash)) return error('invalid info_hash')
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if (!Array.isArray(params.info_hash)) {
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var err = new Error('invalid info_hash')
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self.emit('warning', err)
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return cb(err)
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}
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response = {
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var response = {
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action: common.ACTIONS.SCRAPE,
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files: {},
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flags: {
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min_request_interval: self._intervalMs
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@ -274,159 +344,7 @@ Server.prototype._onHttpRequest = function (req, res) {
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}
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})
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res.end(bencode.encode(response))
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debug('sent response %s', response)
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} else {
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error('only /announce and /scrape are valid endpoints')
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}
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function error (message) {
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debug('sent error %s', message)
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res.end(bencode.encode({
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'failure reason': message
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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', new Error(message))
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}
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}
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Server.prototype._onUdpRequest = function (msg, rinfo) {
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var self = this
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var params
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try {
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params = parseUdpRequest(msg, rinfo)
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} catch (err) {
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console.error(err.stack)
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return error(err.message)
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}
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var socket = dgram.createSocket('udp4')
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var swarm
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if (params && params.action === common.ACTIONS.CONNECT) {
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send(Buffer.concat([
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common.toUInt32(common.ACTIONS.CONNECT),
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common.toUInt32(params.transactionId),
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params.connectionId
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]))
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} else if (params && params.action === common.ACTIONS.ANNOUNCE) {
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swarm = self._getSwarm(params.info_hash)
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var peer = swarm.peers[params.addr]
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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 (params.left === 0) swarm.complete += 1
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else swarm.incomplete += 1
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peer = swarm.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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self.emit('start', params.addr)
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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[params.addr] = null
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self.emit('stop', params.addr)
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}
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var complete = function () {
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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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swarm.complete += 1
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swarm.incomplete -= 1
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peer.complete = true
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self.emit('complete', params.addr)
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}
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var update = function () {
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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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self.emit('update', params.addr)
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}
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switch (params.event) {
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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 'update':
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update()
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break
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default:
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return error('invalid event') // early return
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}
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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._getPeersCompact(swarm, params.numwant)
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send(Buffer.concat([
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common.toUInt32(common.ACTIONS.ANNOUNCE),
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common.toUInt32(params.transactionId),
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common.toUInt32(self._intervalMs),
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common.toUInt32(swarm.incomplete),
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common.toUInt32(swarm.complete),
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peers
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]))
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} else if (params && params.action === common.ACTIONS.SCRAPE) { // scrape message
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swarm = self._getSwarm(params.info_hash)
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send(Buffer.concat([
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common.toUInt32(common.ACTIONS.SCRAPE),
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common.toUInt32(params.transactionId),
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common.toUInt32(swarm.complete),
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common.toUInt32(swarm.complete), // TODO: this only provides a lower-bound
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common.toUInt32(swarm.incomplete)
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]))
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}
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function send (buf) {
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debug('sent response %s', buf.toString('hex'))
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socket.send(buf, 0, buf.length, rinfo.port, rinfo.address, function () {
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try {
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socket.close()
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} catch (err) {}
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})
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}
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function error (message) {
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debug('sent error %s', message)
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send(Buffer.concat([
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common.toUInt32(common.ACTIONS.ERROR),
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common.toUInt32(params.transactionId || 0),
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new Buffer(message, 'utf8')
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]))
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self.emit('warning', new Error(message))
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}
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cb(null, response)
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}
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Server.prototype._getPeers = function (swarm, numwant) {
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@ -553,6 +471,7 @@ function parseUdpRequest (msg, rinfo) {
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params.numwant = Math.min(params.numwant || NUM_ANNOUNCE_PEERS, 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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@ -568,6 +487,47 @@ function parseUdpRequest (msg, rinfo) {
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return params
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}
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function makeUdpPacket (params) {
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switch (params.action) {
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case common.ACTIONS.CONNECT:
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return Buffer.concat([
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common.toUInt32(common.ACTIONS.CONNECT),
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common.toUInt32(params.transactionId),
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params.connectionId
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])
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case common.ACTIONS.ANNOUNCE:
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return Buffer.concat([
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common.toUInt32(common.ACTIONS.ANNOUNCE),
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common.toUInt32(params.transactionId),
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common.toUInt32(params.intervalMs),
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common.toUInt32(params.incomplete),
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common.toUInt32(params.complete),
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params.peers
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])
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case common.ACTIONS.SCRAPE:
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var firstInfoHash = Object.keys(params.files)[0]
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var scrapeInfo = firstInfoHash ? {
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complete: params.files[firstInfoHash].complete,
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incomplete: params.files[firstInfoHash].incomplete,
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completed: params.files[firstInfoHash].complete // TODO: this only provides a lower-bound
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} : {}
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return Buffer.concat([
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common.toUInt32(common.ACTIONS.SCRAPE),
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common.toUInt32(params.transactionId),
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common.toUInt32(scrapeInfo.complete),
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common.toUInt32(scrapeInfo.completed),
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common.toUInt32(scrapeInfo.incomplete)
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])
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case common.ACTIONS.ERROR:
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return Buffer.concat([
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common.toUInt32(common.ACTIONS.ERROR),
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common.toUInt32(params.transactionId || 0),
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new Buffer(params.message, 'utf8')
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])
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default:
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throw new Error('Action not implemented: ' + params.action)
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}
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}
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// HELPER FUNCTIONS
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