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https://github.com/webtorrent/bittorrent-tracker.git
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123 lines
3.6 KiB
JavaScript
123 lines
3.6 KiB
JavaScript
module.exports = Swarm
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var debug = require('debug')('bittorrent-tracker')
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var LRU = require('lru')
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var randomIterate = require('random-iterate')
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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.createSwarm() and Server.getSwarm()
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function Swarm (infoHash, server) {
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this.peers = new LRU({
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max: server.peersCacheLength || 1000,
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maxAge: server.peersCacheTtl || 900000 // 900 000ms = 15 minutes
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})
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this.complete = 0
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this.incomplete = 0
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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 id = params.type === 'ws' ? params.peer_id : params.addr
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// Mark the source peer as recently used in cache
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var peer = self.peers.get(id)
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if (params.event === 'started') {
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self._onAnnounceStarted(params, peer, id)
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} else if (params.event === 'stopped') {
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self._onAnnounceStopped(params, peer, id)
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} else if (params.event === 'completed') {
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self._onAnnounceCompleted(params, peer, id)
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} else if (params.event === 'update') {
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self._onAnnounceUpdate(params, peer, id)
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} else {
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cb(new Error('invalid event'))
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return
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}
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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: self._getPeers(params.numwant, params.peer_id, !!params.socket)
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})
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}
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Swarm.prototype.scrape = function (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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Swarm.prototype._onAnnounceStarted = function (params, peer, id) {
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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._onAnnounceUpdate(params, peer) // 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.set(id, {
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type: params.type,
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complete: params.left === 0,
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peerId: params.peer_id, // as hex
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ip: params.ip,
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port: params.port,
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socket: params.socket // only websocket
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})
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}
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Swarm.prototype._onAnnounceStopped = function (params, peer, id) {
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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.remove(id)
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}
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Swarm.prototype._onAnnounceCompleted = function (params, peer, id) {
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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 this._onAnnounceStarted(params, peer) // 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.peers.set(id, peer)
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}
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Swarm.prototype._onAnnounceUpdate = function (params, peer, id) {
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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 this._onAnnounceStarted(params, peer) // treat as a start
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}
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if (!peer.complete && params.left === 0) {
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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.peers.set(id, peer)
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}
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}
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Swarm.prototype._getPeers = function (numwant, ownPeerId, isWebRTC) {
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var peers = []
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var ite = randomIterate(this.peers.keys)
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var peerId
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while ((peerId = ite()) && peers.length < numwant) {
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// Don't mark the peer as most recently used on announce
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var peer = this.peers.peek(peerId)
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if (!peer) continue
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if (isWebRTC && peer.peerId === ownPeerId) continue // don't send peer to itself
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if ((isWebRTC && peer.type !== 'ws') || (!isWebRTC && peer.type === 'ws')) continue // send proper peer type
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peers.push(peer)
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}
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return peers
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}
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