mirror of
https://github.com/webtorrent/bittorrent-tracker.git
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110 lines
3.0 KiB
JavaScript
110 lines
3.0 KiB
JavaScript
module.exports = Swarm
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var debug = require('debug')('bittorrent-tracker')
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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.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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}
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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 || params.peer_id]
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// Dispatch announce event
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var fn = '_onAnnounce_' + params.event
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if (self[fn]) {
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self[fn](params, peer) // process event
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var peerType = params.compact === undefined ? 'webrtc' : 'addr'
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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, peerType)
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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.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._onAnnounce_started = function (params, peer) {
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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(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[params.addr || params.peer_id] = {
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complete: params.left === 0,
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ip: params.ip, // only http+udp
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peerId: params.peer_id, // as hex
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port: params.port, // only http+udp
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socket: params.socket // only websocket
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}
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}
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Swarm.prototype._onAnnounce_stopped = function (params, peer) {
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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 || params.peer_id] = null
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}
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Swarm.prototype._onAnnounce_completed = function (params, peer) {
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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._onAnnounce_started(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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}
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Swarm.prototype._onAnnounce_update = function (params, peer) {
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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._onAnnounce_started(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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}
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}
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Swarm.prototype._getPeers = function (numWant, peerType) {
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var peers = []
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var ite = randomIterate(Object.keys(this.peers))
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while (true) {
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var peerId = ite()
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if (peers.length >= numWant || peerId == null) return peers
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var peer = this.peers[peerId]
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if (peer &&
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((peerType === 'webrtc' && peer.socket) || (peerType === 'addr' && peer.ip))) {
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peers.push(peer)
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}
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}
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}
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