mirror of
https://github.com/webtorrent/bittorrent-tracker.git
synced 2024-12-15 11:56:25 +00:00
111 lines
3.1 KiB
JavaScript
111 lines
3.1 KiB
JavaScript
module.exports = Swarm
|
|
|
|
var debug = require('debug')('bittorrent-tracker')
|
|
var randomIterate = require('random-iterate')
|
|
|
|
// Regard this as the default implementation of an interface that you
|
|
// need to support when overriding Server.getSwarm()
|
|
function Swarm (infoHash, server) {
|
|
this.peers = {}
|
|
this.complete = 0
|
|
this.incomplete = 0
|
|
}
|
|
|
|
Swarm.prototype.announce = function (params, cb) {
|
|
var self = this
|
|
var peer = self.peers[params.addr || params.peer_id]
|
|
|
|
if (params.event === 'started') {
|
|
self._onAnnounceStarted(params, peer)
|
|
} else if (params.event === 'stopped') {
|
|
self._onAnnounceStopped(params, peer)
|
|
} else if (params.event === 'completed') {
|
|
self._onAnnounceCompleted(params, peer)
|
|
} else if (params.event === 'update') {
|
|
self._onAnnounceUpdate(params, peer)
|
|
} else {
|
|
cb(new Error('invalid event'))
|
|
return
|
|
}
|
|
cb(null, {
|
|
complete: self.complete,
|
|
incomplete: self.incomplete,
|
|
peers: self._getPeers(params.numwant, !!params.socket)
|
|
})
|
|
}
|
|
|
|
Swarm.prototype.scrape = function (params, cb) {
|
|
cb(null, {
|
|
complete: this.complete,
|
|
incomplete: this.incomplete
|
|
})
|
|
}
|
|
|
|
Swarm.prototype._onAnnounceStarted = function (params, peer) {
|
|
if (peer) {
|
|
debug('unexpected `started` event from peer that is already in swarm')
|
|
return this._onAnnounceUpdate(params, peer) // treat as an update
|
|
}
|
|
|
|
if (params.left === 0) this.complete += 1
|
|
else this.incomplete += 1
|
|
peer = this.peers[params.addr || params.peer_id] = {
|
|
complete: params.left === 0,
|
|
peerId: params.peer_id, // as hex
|
|
ip: params.ip, // only http, udp
|
|
port: params.port, // only http, udp
|
|
socket: params.socket // only websocket
|
|
}
|
|
}
|
|
|
|
Swarm.prototype._onAnnounceStopped = function (params, peer) {
|
|
if (!peer) {
|
|
debug('unexpected `stopped` event from peer that is not in swarm')
|
|
return // do nothing
|
|
}
|
|
|
|
if (peer.complete) this.complete -= 1
|
|
else this.incomplete -= 1
|
|
this.peers[params.addr || params.peer_id] = null
|
|
}
|
|
|
|
Swarm.prototype._onAnnounceCompleted = function (params, peer) {
|
|
if (!peer) {
|
|
debug('unexpected `completed` event from peer that is not in swarm')
|
|
return this._onAnnounceStarted(params, peer) // treat as a start
|
|
}
|
|
if (peer.complete) {
|
|
debug('unexpected `completed` event from peer that is already marked as completed')
|
|
return // do nothing
|
|
}
|
|
|
|
this.complete += 1
|
|
this.incomplete -= 1
|
|
peer.complete = true
|
|
}
|
|
|
|
Swarm.prototype._onAnnounceUpdate = function (params, peer) {
|
|
if (!peer) {
|
|
debug('unexpected `update` event from peer that is not in swarm')
|
|
return this._onAnnounceStarted(params, peer) // treat as a start
|
|
}
|
|
|
|
if (!peer.complete && params.left === 0) {
|
|
this.complete += 1
|
|
this.incomplete -= 1
|
|
peer.complete = true
|
|
}
|
|
}
|
|
|
|
Swarm.prototype._getPeers = function (numwant, isWebRTC) {
|
|
var peers = []
|
|
var ite = randomIterate(Object.keys(this.peers))
|
|
var peerId
|
|
while ((peerId = ite()) && peers.length < numwant) {
|
|
var peer = this.peers[peerId]
|
|
if (!peer) continue
|
|
if ((isWebRTC && peer.socket) || (!isWebRTC && peer.ip)) peers.push(peer)
|
|
}
|
|
return peers
|
|
}
|