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// TODO: dhtPort and torrentPort should be consistent between restarts
// TODO: peerId and nodeId should be consistent between restarts
module.exports = WebTorrent
var createTorrent = require('create-torrent')
var debug = require('debug')('webtorrent')
var DHT = require('bittorrent-dht/client') // browser exclude
var EventEmitter = require('events').EventEmitter
var extend = require('extend.js')
var FileReadStream = require('filestream/read')
var FSStorage = require('./lib/fs-storage') // browser exclude
var hat = require('hat')
var inherits = require('inherits')
var loadIPSet = require('load-ip-set') // browser exclude
var parallel = require('run-parallel')
var parseTorrent = require('parse-torrent')
var speedometer = require('speedometer')
var Storage = require('./lib/storage')
var stream = require('stream')
var Torrent = require('./lib/torrent')
inherits(WebTorrent, EventEmitter)
/**
* WebTorrent Client
* @param {Object} opts
*/
function WebTorrent (opts) {
var self = this
if (!(self instanceof WebTorrent)) return new WebTorrent(opts)
if (!opts) opts = {}
EventEmitter.call(self)
self.torrentPort = opts.torrentPort || 0
self.tracker = (opts.tracker !== undefined) ? opts.tracker : true
self.torrents = []
self.downloadSpeed = speedometer()
self.uploadSpeed = speedometer()
self.storage = typeof opts.storage === 'function'
? opts.storage
: (opts.storage !== false && typeof FSStorage === 'function' /* browser exclude */)
? FSStorage
: Storage
self.peerId = opts.peerId === undefined
? new Buffer('-WW0001-' + hat(48), 'utf8')
: typeof opts.peerId === 'string'
? new Buffer(opts.peerId, 'utf8')
: opts.peerId
self.peerIdHex = self.peerId.toString('hex')
self.nodeId = opts.nodeId === undefined
? new Buffer(hat(160), 'hex')
: typeof opts.nodeId === 'string'
? new Buffer(opts.nodeId, 'hex')
: opts.nodeId
self.nodeIdHex = self.nodeId.toString('hex')
// TODO: implement webtorrent-dht
if (opts.dht !== false && typeof DHT === 'function' /* browser exclude */) {
// use a single DHT instance for all torrents, so the routing table can be reused
self.dht = new DHT(extend({ nodeId: self.nodeId }, opts.dht))
self.dht.listen(opts.dhtPort)
}
debug('new webtorrent (peerId %s, nodeId %s)', self.peerIdHex, self.nodeIdHex)
if (typeof loadIPSet === 'function') {
loadIPSet(opts.blocklist, function (err, ipSet) {
self.blocked = ipSet
ready()
})
} else process.nextTick(ready)
function ready () {
self.ready = true
self.emit('ready')
}
}
/**
* Seed ratio for all torrents in the client.
* @type {number}
*/
Object.defineProperty(WebTorrent.prototype, 'ratio', {
get: function () {
var self = this
var uploaded = self.torrents.reduce(function (total, torrent) {
return total + torrent.uploaded
}, 0)
var downloaded = self.torrents.reduce(function (total, torrent) {
return total + torrent.downloaded
}, 0) || 1
return uploaded / downloaded
}
})
/**
* Returns the torrent with the given `torrentId`. Convenience method. Easier than
* searching through the `client.torrents` array.
*
* @param {string|Buffer|Object} torrentId
* @return {Torrent}
*/
WebTorrent.prototype.get = function (torrentId) {
var self = this
var parsed = parseTorrent(torrentId)
if (!parsed || !parsed.infoHash) return null
for (var i = 0, len = self.torrents.length; i < len; i++) {
var torrent = self.torrents[i]
if (torrent.infoHash === parsed.infoHash) return torrent
}
return null
}
/**
* Start downloading a new torrent. Aliased as `client.download`.
*
* `torrentId` can be one of:
* - magnet uri (utf8 string)
* - torrent file (buffer)
* - info hash (hex string or buffer)
* - parsed torrent (from [parse-torrent](https://github.com/feross/parse-torrent))
* - http/https url to a torrent file (string)
* - filesystem path to a torrent file (string)
*
* @param {string|Buffer|Object} torrentId
* @param {Object} opts torrent-specific options
* @param {function=} ontorrent called when the torrent is ready (has metadata)
*/
WebTorrent.prototype.add =
WebTorrent.prototype.download = function (torrentId, opts, ontorrent) {
var self = this
debug('add %s', torrentId)
if (typeof opts === 'function') {
ontorrent = opts
opts = {}
}
if (!opts) opts = {}
opts.client = self
opts.storage = opts.storage || self.storage
var torrent = new Torrent(torrentId, extend({ client: self }, opts))
self.torrents.push(torrent)
function clientOnTorrent (_torrent) {
if (torrent.infoHash === _torrent.infoHash) {
ontorrent(torrent)
self.removeListener('torrent', clientOnTorrent)
}
}
if (ontorrent) self.on('torrent', clientOnTorrent)
torrent.on('error', function (err) {
self.emit('error', err, torrent)
})
torrent.on('listening', function (port) {
self.emit('listening', port, torrent)
})
torrent.on('ready', function () {
// Emit 'torrent' when a torrent is ready to be used
debug('torrent')
self.emit('torrent', torrent)
})
return torrent
}
/**
* Start seeding a new torrent.
*
* `input` can be any of the following:
* - path to the file or folder on filesystem (string)
* - W3C File object (from an `<input>` or drag and drop)
* - W3C FileList object (basically an array of `File` objects)
* - Array of `File` objects
*
* @param {string|File|FileList|Blob|Buffer|Array.<File|Blob|Buffer>} input
* @param {Object} opts
* @param {function} onseed
*/
WebTorrent.prototype.seed = function (input, opts, onseed) {
var self = this
if (typeof opts === 'function') {
onseed = opts
opts = {}
}
// TODO: support `input` as string, or array of strings
if (typeof FileList !== 'undefined' && input instanceof FileList)
input = Array.prototype.slice.call(input)
if (isBlob(input) || Buffer.isBuffer(input)) {
input = [ input ]
}
var streams = input.map(function (item) {
if (isBlob(item)) return new FileReadStream(item)
else if (Buffer.isBuffer(item)) {
var s = new stream.PassThrough()
s.end(item)
return s
} else throw new Error('unsupported input type to `seed`')
})
var torrent
createTorrent(input, opts, function (err, torrentBuf) {
if (err) return self.emit('error', err)
self.add(torrentBuf, opts, function (_torrent) {
torrent = _torrent
torrent.storage.load(
streams,
function (err) {
if (err) return self.emit('error', err)
self.emit('seed', torrent)
})
})
})
function clientOnSeed (_torrent) {
if (torrent.infoHash === _torrent.infoHash) {
onseed(torrent)
self.removeListener('seed', clientOnSeed)
}
}
if (onseed) self.on('seed', clientOnSeed)
}
/**
* Remove a torrent from the client.
*
* @param {string|Buffer} torrentId
* @param {function} cb
*/
WebTorrent.prototype.remove = function (torrentId, cb) {
var self = this
var torrent = self.get(torrentId)
if (!torrent) throw new Error('No torrent with id ' + torrentId)
debug('remove')
self.torrents.splice(self.torrents.indexOf(torrent), 1)
torrent.destroy(cb)
}
/**
* Destroy the client, including all torrents and connections to peers.
*
* @override
* @param {function} cb
*/
WebTorrent.prototype.destroy = function (cb) {
var self = this
debug('destroy')
var tasks = self.torrents.map(function (torrent) {
return function (cb) {
self.remove(torrent.infoHash, cb)
}
})
if (self.dht) tasks.push(function (cb) {
self.dht.destroy(cb)
})
parallel(tasks, cb)
}
/**
* Check if `obj` is a W3C Blob object (which is the superclass of W3C File)
* @param {*} obj
* @return {boolean}
*/
function isBlob (obj) {
return typeof Blob !== 'undefined' && obj instanceof Blob
}
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