react-native/Libraries/WebSocket/WebSocket.js

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/**
* Copyright (c) 2015-present, Facebook, Inc.
* All rights reserved.
*
* This source code is licensed under the BSD-style license found in the
* LICENSE file in the root directory of this source tree. An additional grant
* of patent rights can be found in the PATENTS file in the same directory.
*
* @providesModule WebSocket
* @flow
*/
'use strict';
const NativeEventEmitter = require('NativeEventEmitter');
const Platform = require('Platform');
const RCTWebSocketModule = require('NativeModules').WebSocketModule;
const WebSocketEvent = require('WebSocketEvent');
const EventTarget = require('event-target-shim');
const base64 = require('base64-js');
import type EventSubscription from 'EventSubscription';
type ArrayBufferView =
Int8Array |
Uint8Array |
Uint8ClampedArray |
Int16Array |
Uint16Array |
Int32Array |
Uint32Array |
Float32Array |
Float64Array |
DataView;
const CONNECTING = 0;
const OPEN = 1;
const CLOSING = 2;
const CLOSED = 3;
const CLOSE_NORMAL = 1000;
const WEBSOCKET_EVENTS = [
'close',
'error',
'message',
'open',
];
let nextWebSocketId = 0;
/**
* Browser-compatible WebSockets implementation.
*
* See https://developer.mozilla.org/en-US/docs/Web/API/WebSocket
* See https://github.com/websockets/ws
*/
class WebSocket extends EventTarget(...WEBSOCKET_EVENTS) {
static CONNECTING = CONNECTING;
static OPEN = OPEN;
static CLOSING = CLOSING;
static CLOSED = CLOSED;
CONNECTING: number = CONNECTING;
OPEN: number = OPEN;
CLOSING: number = CLOSING;
CLOSED: number = CLOSED;
_socketId: number;
_eventEmitter: NativeEventEmitter;
_subscriptions: Array<EventSubscription>;
onclose: ?Function;
onerror: ?Function;
onmessage: ?Function;
onopen: ?Function;
binaryType: ?string;
bufferedAmount: number;
extension: ?string;
protocol: ?string;
readyState: number = CONNECTING;
url: ?string;
constructor(url: string, protocols: ?string | ?Array<string>, options: ?{origin?: string}) {
super();
if (typeof protocols === 'string') {
protocols = [protocols];
}
if (!Array.isArray(protocols)) {
protocols = null;
}
this._eventEmitter = new NativeEventEmitter(RCTWebSocketModule);
this._socketId = nextWebSocketId++;
RCTWebSocketModule.connect(url, protocols, options, this._socketId);
this._registerEvents();
}
close(code?: number, reason?: string): void {
if (this.readyState === this.CLOSING ||
this.readyState === this.CLOSED) {
return;
}
this.readyState = this.CLOSING;
this._close(code, reason);
}
send(data: string | ArrayBuffer | ArrayBufferView): void {
if (this.readyState === this.CONNECTING) {
throw new Error('INVALID_STATE_ERR');
}
if (typeof data === 'string') {
RCTWebSocketModule.send(data, this._socketId);
return;
}
if (ArrayBuffer.isView(data)) {
// $FlowFixMe: no way to assert that 'data' is indeed an ArrayBufferView now
data = data.buffer;
}
if (data instanceof ArrayBuffer) {
data = base64.fromByteArray(new Uint8Array(data));
RCTWebSocketModule.sendBinary(data, this._socketId);
return;
}
throw new Error('Unsupported data type');
}
ping(): void {
if (this.readyState === this.CONNECTING) {
throw new Error('INVALID_STATE_ERR');
}
RCTWebSocketModule.ping(this._socketId);
}
_close(code?: number, reason?: string): void {
if (Platform.OS === 'android') {
// See https://developer.mozilla.org/en-US/docs/Web/API/CloseEvent
const statusCode = typeof code === 'number' ? code : CLOSE_NORMAL;
const closeReason = typeof reason === 'string' ? reason : '';
RCTWebSocketModule.close(statusCode, closeReason, this._socketId);
} else {
RCTWebSocketModule.close(this._socketId);
}
}
_unregisterEvents(): void {
this._subscriptions.forEach(e => e.remove());
this._subscriptions = [];
}
_registerEvents(): void {
this._subscriptions = [
this._eventEmitter.addListener('websocketMessage', ev => {
if (ev.id !== this._socketId) {
return;
}
this.dispatchEvent(new WebSocketEvent('message', {
data: (ev.type === 'binary') ? base64.toByteArray(ev.data).buffer : ev.data
}));
}),
this._eventEmitter.addListener('websocketOpen', ev => {
if (ev.id !== this._socketId) {
return;
}
this.readyState = this.OPEN;
this.dispatchEvent(new WebSocketEvent('open'));
}),
this._eventEmitter.addListener('websocketClosed', ev => {
if (ev.id !== this._socketId) {
return;
}
this.readyState = this.CLOSED;
this.dispatchEvent(new WebSocketEvent('close', {
code: ev.code,
reason: ev.reason,
}));
this._unregisterEvents();
this.close();
}),
this._eventEmitter.addListener('websocketFailed', ev => {
if (ev.id !== this._socketId) {
return;
}
this.readyState = this.CLOSED;
this.dispatchEvent(new WebSocketEvent('error', {
message: ev.message,
}));
this.dispatchEvent(new WebSocketEvent('close', {
message: ev.message,
}));
this._unregisterEvents();
this.close();
})
];
}
}
module.exports = WebSocket;