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WebSocketSubject.ts
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WebSocketSubject.ts
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import {Subject, AnonymousSubject} from '../../Subject';
import {Subscriber} from '../../Subscriber';
import {Observable} from '../../Observable';
import {Subscription} from '../../Subscription';
import {Operator} from '../../Operator';
import {root} from '../../util/root';
import {ReplaySubject} from '../../ReplaySubject';
import {Observer, NextObserver} from '../../Observer';
import {tryCatch} from '../../util/tryCatch';
import {errorObject} from '../../util/errorObject';
import {assign} from '../../util/assign';
export interface WebSocketSubjectConfig {
url: string;
protocol?: string | Array<string>;
resultSelector?: <T>(e: MessageEvent) => T;
openObserver?: NextObserver<Event>;
closeObserver?: NextObserver<CloseEvent>;
closingObserver?: NextObserver<void>;
WebSocketCtor?: { new(url: string, protocol?: string|Array<string>): WebSocket };
}
/**
* We need this JSDoc comment for affecting ESDoc.
* @extends {Ignored}
* @hide true
*/
export class WebSocketSubject<T> extends AnonymousSubject<T> {
url: string;
protocol: string|Array<string>;
socket: WebSocket;
openObserver: NextObserver<Event>;
closeObserver: NextObserver<CloseEvent>;
closingObserver: NextObserver<void>;
WebSocketCtor: { new(url: string, protocol?: string|Array<string>): WebSocket };
private _output: Subject<T>;
resultSelector(e: MessageEvent) {
return JSON.parse(e.data);
}
/**
* @param urlConfigOrSource
* @return {WebSocketSubject}
* @static true
* @name webSocket
* @owner Observable
*/
static create<T>(urlConfigOrSource: string | WebSocketSubjectConfig): WebSocketSubject<T> {
return new WebSocketSubject<T>(urlConfigOrSource);
}
constructor(urlConfigOrSource: string | WebSocketSubjectConfig | Observable<T>, destination?: Observer<T>) {
if (urlConfigOrSource instanceof Observable) {
super(destination, <Observable<T>> urlConfigOrSource);
} else {
super();
this.WebSocketCtor = root.WebSocket;
this._output = new Subject<T>();
if (typeof urlConfigOrSource === 'string') {
this.url = urlConfigOrSource;
} else {
// WARNING: config object could override important members here.
assign(this, urlConfigOrSource);
}
if (!this.WebSocketCtor) {
throw new Error('no WebSocket constructor can be found');
}
this.destination = new ReplaySubject();
}
}
lift<R>(operator: Operator<T, R>): WebSocketSubject<R> {
const sock = new WebSocketSubject<R>(this, <any> this.destination);
sock.operator = operator;
return sock;
}
// TODO: factor this out to be a proper Operator/Subscriber implementation and eliminate closures
multiplex(subMsg: () => any, unsubMsg: () => any, messageFilter: (value: T) => boolean) {
const self = this;
return new Observable((observer: Observer<any>) => {
const result = tryCatch(subMsg)();
if (result === errorObject) {
observer.error(errorObject.e);
} else {
self.next(result);
}
let subscription = self.subscribe(x => {
const result = tryCatch(messageFilter)(x);
if (result === errorObject) {
observer.error(errorObject.e);
} else if (result) {
observer.next(x);
}
},
err => observer.error(err),
() => observer.complete());
return () => {
const result = tryCatch(unsubMsg)();
if (result === errorObject) {
observer.error(errorObject.e);
} else {
self.next(result);
}
subscription.unsubscribe();
};
});
}
private _connectSocket() {
const { WebSocketCtor } = this;
const observer = this._output;
let socket: WebSocket = null;
try {
socket = this.protocol ?
new WebSocketCtor(this.url, this.protocol) :
new WebSocketCtor(this.url);
this.socket = socket;
} catch (e) {
observer.error(e);
return;
}
const subscription = new Subscription(() => {
this.socket = null;
if (socket && socket.readyState === 1) {
socket.close();
}
});
socket.onopen = (e: Event) => {
const openObserver = this.openObserver;
if (openObserver) {
openObserver.next(e);
}
const queue = this.destination;
this.destination = Subscriber.create(
(x) => socket.readyState === 1 && socket.send(x),
(e) => {
const closingObserver = this.closingObserver;
if (closingObserver) {
closingObserver.next(undefined);
}
if (e && e.code) {
socket.close(e.code, e.reason);
} else {
observer.error(new TypeError('WebSocketSubject.error must be called with an object with an error code, ' +
'and an optional reason: { code: number, reason: string }'));
}
this.destination = new ReplaySubject();
this.socket = null;
},
( ) => {
const closingObserver = this.closingObserver;
if (closingObserver) {
closingObserver.next(undefined);
}
socket.close();
this.destination = new ReplaySubject();
this.socket = null;
}
);
if (queue && queue instanceof ReplaySubject) {
subscription.add((<ReplaySubject<T>>queue).subscribe(this.destination));
}
};
socket.onerror = (e: Event) => observer.error(e);
socket.onclose = (e: CloseEvent) => {
const closeObserver = this.closeObserver;
if (closeObserver) {
closeObserver.next(e);
}
if (e.wasClean) {
observer.complete();
} else {
observer.error(e);
}
};
socket.onmessage = (e: MessageEvent) => {
const result = tryCatch(this.resultSelector)(e);
if (result === errorObject) {
observer.error(errorObject.e);
} else {
observer.next(result);
}
};
}
protected _subscribe(subscriber: Subscriber<T>): Subscription {
const { source } = this;
if (source) {
return source.subscribe(subscriber);
}
if (!this.socket) {
this._connectSocket();
}
let subscription = new Subscription();
subscription.add(this._output.subscribe(subscriber));
subscription.add(() => {
const { socket } = this;
if (this._output.observers.length === 0 && socket && socket.readyState === 1) {
socket.close();
this.socket = null;
}
});
return subscription;
}
unsubscribe() {
const { source, socket } = this;
if (socket && socket.readyState === 1) {
socket.close();
this.socket = null;
}
super.unsubscribe();
if (!source) {
this.destination = new ReplaySubject();
}
}
}