angular-cn/packages/zone.js/lib/browser/websocket.ts

60 lines
2.4 KiB
TypeScript

/**
* @license
* Copyright Google Inc. All Rights Reserved.
*
* Use of this source code is governed by an MIT-style license that can be
* found in the LICENSE file at https://angular.io/license
*/
// we have to patch the instance since the proto is non-configurable
export function apply(api: _ZonePrivate, _global: any) {
const {ADD_EVENT_LISTENER_STR, REMOVE_EVENT_LISTENER_STR} = api.getGlobalObjects() !;
const WS = (<any>_global).WebSocket;
// On Safari window.EventTarget doesn't exist so need to patch WS add/removeEventListener
// On older Chrome, no need since EventTarget was already patched
if (!(<any>_global).EventTarget) {
api.patchEventTarget(_global, [WS.prototype]);
}
(<any>_global).WebSocket = function(x: any, y: any) {
const socket = arguments.length > 1 ? new WS(x, y) : new WS(x);
let proxySocket: any;
let proxySocketProto: any;
// Safari 7.0 has non-configurable own 'onmessage' and friends properties on the socket instance
const onmessageDesc = api.ObjectGetOwnPropertyDescriptor(socket, 'onmessage');
if (onmessageDesc && onmessageDesc.configurable === false) {
proxySocket = api.ObjectCreate(socket);
// socket have own property descriptor 'onopen', 'onmessage', 'onclose', 'onerror'
// but proxySocket not, so we will keep socket as prototype and pass it to
// patchOnProperties method
proxySocketProto = socket;
[ADD_EVENT_LISTENER_STR, REMOVE_EVENT_LISTENER_STR, 'send', 'close'].forEach(function(
propName) {
proxySocket[propName] = function() {
const args = api.ArraySlice.call(arguments);
if (propName === ADD_EVENT_LISTENER_STR || propName === REMOVE_EVENT_LISTENER_STR) {
const eventName = args.length > 0 ? args[0] : undefined;
if (eventName) {
const propertySymbol = Zone.__symbol__('ON_PROPERTY' + eventName);
socket[propertySymbol] = proxySocket[propertySymbol];
}
}
return socket[propName].apply(socket, args);
};
});
} else {
// we can patch the real socket
proxySocket = socket;
}
api.patchOnProperties(proxySocket, ['close', 'error', 'message', 'open'], proxySocketProto);
return proxySocket;
};
const globalWebSocket = _global['WebSocket'];
for (const prop in WS) {
globalWebSocket[prop] = WS[prop];
}
}