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UdpSocket.js
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UdpSocket.js
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//
// react-native-udp
//
// Created by Mark Vayngrib on 05/10/15.
// Copyright (c) 2015 Tradle, Inc. All rights reserved.
//
/**
* @providesModule UdpSocket
* @flow
*/
'use strict';
var inherits = require('inherits')
var EventEmitter = require('events').EventEmitter
var {
DeviceEventEmitter,
NativeModules
} = require('react-native');
var Sockets = NativeModules.UdpSockets
var base64 = require('base64-js')
var ipRegex = require('ip-regex')
// RFC 952 hostname format
var hostnameRegex = /^(([a-zA-Z]|[a-zA-Z][a-zA-Z0-9\-]*[a-zA-Z0-9])\.)*([A-Za-z]|[A-Za-z][A-Za-z0-9\-]*[A-Za-z0-9])$/;
var noop = function () {}
var instances = 0
var STATE = {
UNBOUND: 0,
BINDING: 1,
BOUND: 2
}
const noop = function () {}
module.exports = UdpSocket
function UdpSocket(options, onmessage) {
EventEmitter.call(this)
if (typeof options === 'string') options = { type: options }
if (options.type !== 'udp4' && options.type !== 'udp6') {
throw new Error('invalid udp socket type')
}
this.type = options.type
this._ipv = Number(this.type.slice(3))
this._ipRegex = ipRegex['v' + this._ipv]({ exact: true })
this._id = instances++
this._state = STATE.UNBOUND
this._subscription = DeviceEventEmitter.addListener(
'udp-' + this._id + '-data', this._onReceive.bind(this)
);
// ensure compatibility with node's EventEmitter
if (!this.on) this.on = this.addListener.bind(this)
if (onmessage) this.on('message', onmessage)
Sockets.createSocket(this._id, {
type: this.type
}) // later
}
inherits(UdpSocket, EventEmitter)
UdpSocket.prototype._debug = function() {
if (__DEV__) {
var args = [].slice.call(arguments)
args.unshift('socket-' + this._id)
console.log.apply(console, args)
}
}
UdpSocket.prototype.bind = function(port, address, callback) {
var self = this
if (this._state !== STATE.UNBOUND) throw new Error('Socket is already bound')
if (typeof address === 'function') {
callback = address
address = undefined
}
if (!address) address = '0.0.0.0'
if (!port) port = 0
if (callback) this.once('listening', callback.bind(this))
this._state = STATE.BINDING
this._debug('binding, address:', address, 'port:', port)
Sockets.bind(this._id, port, address, function(err, addr) {
err = normalizeError(err)
if (err) {
// questionable: may want to self-destruct and
// force user to create a new socket
self._state = STATE.UNBOUND
self._debug('failed to bind', err)
if (callback) callback(err)
return self.emit('error', err)
}
self._debug('bound to address:', addr.address, 'port:', addr.port)
self._address = addr.address
self._port = addr.port
self._state = STATE.BOUND
self.emit('listening')
})
}
UdpSocket.prototype.close = function (callback=noop) {
if (this._destroyed) {
return process.nextTick(callback)
}
this.once('close', callback)
if (this._destroying) return
this._destroying = true
this._debug('closing')
this._subscription.remove();
Sockets.close(this._id, err => {
if (err) return this.emit('error', err)
this._destroyed = true
this._debug('closed')
this.emit('close')
})
}
UdpSocket.prototype._onReceive = function(info) {
// from base64 string
var buf = typeof Buffer === 'undefined'
? base64.toByteArray(info.data)
: new Buffer(info.data, 'base64')
var rinfo = {
address: info.address,
port: info.port,
family: 'IPv4', // not necessarily
size: buf.length
}
this.emit('message', buf, rinfo)
}
/**
* socket.send(buf, offset, length, port, address, [callback])
*
* For UDP sockets, the destination port and IP address must be
* specified. A string may be supplied for the address parameter, and it will
* be resolved with DNS. An optional callback may be specified to detect any
* DNS errors and when buf may be re-used. Note that DNS lookups will delay
* the time that a send takes place, at least until the next tick. The only
* way to know for sure that a send has taken place is to use the callback.
*
* If the socket has not been previously bound with a call to bind, it's
* assigned a random port number and bound to the "all interfaces" address
* (0.0.0.0 for udp4 sockets, ::0 for udp6 sockets).
*
* @param {Array|string} message to be sent
* @param {number} offset Offset in the buffer where the message starts.
* @param {number} length Number of bytes in the message.
* @param {number} port destination port
* @param {string} address destination IP
* @param {function} callback Callback when message is done being delivered.
* Optional.
*/
// UdpSocket.prototype.send = function (buf, host, port, cb) {
UdpSocket.prototype.send = function(buffer, offset, length, port, address, callback) {
var self = this
if (typeof port !== 'number') throw new Error('invalid port')
if (!isValidIpOrHostname(address, this._ipRegex)) throw new Error('invalid address')
if (offset !== 0) throw new Error('Non-zero offset not supported yet')
if (this._state === STATE.UNBOUND) {
var args = [].slice.call(arguments)
return this.bind(0, function(err) {
if (err) return callback(err)
self.send.apply(self, args)
})
}
else if (this._state === STATE.BINDING) {
// we're ok, GCDAsync(Udp)Socket handles queueing internally
}
callback = callback || noop
var str
if (typeof buffer === 'string') {
console.warn('socket.send(): interpreting as base64')
str = buffer
}
else if (typeof Buffer !== 'undefined' && Buffer.isBuffer(buffer)) {
str = buffer.toString('base64')
}
else if (buffer instanceof Uint8Array || Array.isArray(buffer)) {
str = base64.fromByteArray(buffer)
}
else {
throw new Error('invalid message format')
}
Sockets.send(this._id, str, +port, address, function(err) {
err = normalizeError(err)
if (err) {
self._debug('send failed', err)
return callback(err)
}
callback()
})
}
UdpSocket.prototype.address = function() {
if (this._state !== STATE.BOUND) {
throw new Error('socket is not bound yet')
}
return {
address: this._address,
port: this._port,
family: 'IPv4'
}
}
UdpSocket.prototype.setBroadcast = function(flag) {
var self = this
if (this._state !== STATE.BOUND) {
throw new Error('you must bind before setBroadcast()')
}
Sockets.setBroadcast(this._id, flag, function(err) {
err = normalizeError(err)
if (err) {
self._debug('failed to set broadcast', err)
return self.emit('error', err)
}
});
}
UdpSocket.prototype.setTTL = function(ttl) {
// nothing yet
}
UdpSocket.prototype.setMulticastTTL = function(ttl, callback) {
// nothing yet
}
UdpSocket.prototype.setMulticastLoopback = function(flag, callback) {
// nothing yet
}
UdpSocket.prototype.addMembership = function(multicastAddress) {
if (this._state !== STATE.BOUND) {
throw new Error('you must bind before addMembership()')
}
Sockets.addMembership(this._id, multicastAddress);
}
UdpSocket.prototype.dropMembership = function(multicastAddress) {
if (this._state !== STATE.BOUND) {
throw new Error('you must bind before addMembership()')
}
Sockets.dropMembership(this._id, multicastAddress);
}
UdpSocket.prototype.ref = function() {
// anything?
}
UdpSocket.prototype.unref = function() {
// anything?
}
function isValidIpOrHostname (address, ipRegex) {
if (typeof address !== 'string') return false
return ipRegex.test(address) || hostnameRegex.test(address);
}
function normalizeError (err) {
if (err) {
if (typeof err === 'string') err = new Error(err)
return err
}
}