@reactivex/rxjs
Version:
Reactive Extensions for modern JavaScript
177 lines • 6.57 kB
JavaScript
import { Subject } from '../../Subject';
import { Subscriber } from '../../Subscriber';
import { Observable } from '../../Observable';
import { Subscription } from '../../Subscription';
import { root } from '../../util/root';
import { ReplaySubject } from '../../ReplaySubject';
import { tryCatch } from '../../util/tryCatch';
import { errorObject } from '../../util/errorObject';
import { assign } from '../../util/assign';
/**
* We need this JSDoc comment for affecting ESDoc.
* @extends {Ignored}
* @hide true
*/
export class WebSocketSubject extends Subject {
constructor(urlConfigOrSource, destination) {
if (urlConfigOrSource instanceof Observable) {
super(destination, urlConfigOrSource);
}
else {
super();
this.WebSocketCtor = root.WebSocket;
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();
}
}
resultSelector(e) {
return JSON.parse(e.data);
}
/**
* @param urlConfigOrSource
* @return {WebSocketSubject}
* @static true
* @name webSocket
* @owner Observable
*/
static create(urlConfigOrSource) {
return new WebSocketSubject(urlConfigOrSource);
}
lift(operator) {
const sock = new WebSocketSubject(this, this.destination);
sock.operator = operator;
return sock;
}
// TODO: factor this out to be a proper Operator/Subscriber implementation and eliminate closures
multiplex(subMsg, unsubMsg, messageFilter) {
const self = this;
return new Observable((observer) => {
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();
};
});
}
_unsubscribe() {
this.socket = null;
this.source = null;
this.destination = new ReplaySubject();
this.isStopped = false;
this.hasErrored = false;
this.hasCompleted = false;
this.observers = null;
this.isUnsubscribed = false;
}
_subscribe(subscriber) {
if (!this.observers) {
this.observers = [];
}
const subscription = super._subscribe(subscriber);
// HACK: For some reason transpilation wasn't honoring this in arrow functions below
// Doesn't seem right, need to reinvestigate.
const self = this;
const WebSocket = this.WebSocketCtor;
if (self.source || !subscription || subscription.isUnsubscribed) {
return subscription;
}
if (self.url && !self.socket) {
const socket = self.protocol ? new WebSocket(self.url, self.protocol) : new WebSocket(self.url);
self.socket = socket;
socket.onopen = (e) => {
const openObserver = self.openObserver;
if (openObserver) {
openObserver.next(e);
}
const queue = self.destination;
self.destination = Subscriber.create((x) => socket.readyState === 1 && socket.send(x), (e) => {
const closingObserver = self.closingObserver;
if (closingObserver) {
closingObserver.next(undefined);
}
if (e && e.code) {
socket.close(e.code, e.reason);
}
else {
self._finalError(new TypeError('WebSocketSubject.error must be called with an object with an error code, ' +
'and an optional reason: { code: number, reason: string }'));
}
}, () => {
const closingObserver = self.closingObserver;
if (closingObserver) {
closingObserver.next(undefined);
}
socket.close();
});
if (queue && queue instanceof ReplaySubject) {
subscription.add(queue.subscribe(self.destination));
}
};
socket.onerror = (e) => self.error(e);
socket.onclose = (e) => {
const closeObserver = self.closeObserver;
if (closeObserver) {
closeObserver.next(e);
}
if (e.wasClean) {
self._finalComplete();
}
else {
self._finalError(e);
}
};
socket.onmessage = (e) => {
const result = tryCatch(self.resultSelector)(e);
if (result === errorObject) {
self._finalError(errorObject.e);
}
else {
self._finalNext(result);
}
};
}
return new Subscription(() => {
subscription.unsubscribe();
if (!this.observers || this.observers.length === 0) {
const { socket } = this;
if (socket && socket.readyState < 2) {
socket.close();
}
this.socket = undefined;
this.source = undefined;
this.destination = new ReplaySubject();
}
});
}
}
//# sourceMappingURL=WebSocketSubject.js.map