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import { Subject, AnonymousSubject } from '../../Subject';
import { Subscriber } from '../../Subscriber';
import { Observable } from '../../Observable';
import { Subscription } from '../../Subscription';
import { ReplaySubject } from '../../ReplaySubject';
import { tryCatch } from '../../util/tryCatch';
import { errorObject } from '../../util/errorObject';
const DEFAULT_WEBSOCKET_CONFIG = {
url: '',
deserializer: (e) => JSON.parse(e.data),
serializer: (value) => JSON.stringify(value),
};
const WEBSOCKETSUBJECT_INVALID_ERROR_OBJECT = 'WebSocketSubject.error must be called with an object with an error code, and an optional reason: { code: number, reason: string }';
export class WebSocketSubject extends AnonymousSubject {
constructor(urlConfigOrSource, destination) {
super();
if (urlConfigOrSource instanceof Observable) {
this.destination = destination;
this.source = urlConfigOrSource;
}
else {
const config = this._config = Object.assign({}, DEFAULT_WEBSOCKET_CONFIG);
this._output = new Subject();
if (typeof urlConfigOrSource === 'string') {
config.url = urlConfigOrSource;
}
else {
for (let key in urlConfigOrSource) {
if (urlConfigOrSource.hasOwnProperty(key)) {
config[key] = urlConfigOrSource[key];
}
}
}
if (!config.WebSocketCtor && WebSocket) {
config.WebSocketCtor = WebSocket;
}
else if (!config.WebSocketCtor) {
throw new Error('no WebSocket constructor can be found');
}
this.destination = new ReplaySubject();
}
}
lift(operator) {
const sock = new WebSocketSubject(this._config, this.destination);
sock.operator = operator;
sock.source = this;
return sock;
}
_resetState() {
this._socket = null;
if (!this.source) {
this.destination = new ReplaySubject();
}
this._output = new Subject();
}
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();
};
});
}
_connectSocket() {
const { WebSocketCtor, protocol, url, binaryType } = this._config;
const observer = this._output;
let socket = null;
try {
socket = protocol ?
new WebSocketCtor(url, protocol) :
new WebSocketCtor(url);
this._socket = socket;
if (binaryType) {
this._socket.binaryType = binaryType;
}
}
catch (e) {
observer.error(e);
return;
}
const subscription = new Subscription(() => {
this._socket = null;
if (socket && socket.readyState === 1) {
socket.close();
}
});
socket.onopen = (e) => {
const { openObserver } = this._config;
if (openObserver) {
openObserver.next(e);
}
const queue = this.destination;
this.destination = Subscriber.create((x) => {
if (socket.readyState === 1) {
const { serializer } = this._config;
const msg = tryCatch(serializer)(x);
if (msg === errorObject) {
this.destination.error(errorObject.e);
return;
}
socket.send(msg);
}
}, (e) => {
const { closingObserver } = this._config;
if (closingObserver) {
closingObserver.next(undefined);
}
if (e && e.code) {
socket.close(e.code, e.reason);
}
else {
observer.error(new TypeError(WEBSOCKETSUBJECT_INVALID_ERROR_OBJECT));
}
this._resetState();
}, () => {
const { closingObserver } = this._config;
if (closingObserver) {
closingObserver.next(undefined);
}
socket.close();
this._resetState();
});
if (queue && queue instanceof ReplaySubject) {
subscription.add(queue.subscribe(this.destination));
}
};
socket.onerror = (e) => {
this._resetState();
observer.error(e);
};
socket.onclose = (e) => {
this._resetState();
const { closeObserver } = this._config;
if (closeObserver) {
closeObserver.next(e);
}
if (e.wasClean) {
observer.complete();
}
else {
observer.error(e);
}
};
socket.onmessage = (e) => {
const { deserializer } = this._config;
const result = tryCatch(deserializer)(e);
if (result === errorObject) {
observer.error(errorObject.e);
}
else {
observer.next(result);
}
};
}
_subscribe(subscriber) {
const { source } = this;
if (source) {
return source.subscribe(subscriber);
}
if (!this._socket) {
this._connectSocket();
}
this._output.subscribe(subscriber);
subscriber.add(() => {
const { _socket } = this;
if (this._output.observers.length === 0) {
if (_socket && _socket.readyState === 1) {
_socket.close();
}
this._resetState();
}
});
return subscriber;
}
unsubscribe() {
const { source, _socket } = this;
if (_socket && _socket.readyState === 1) {
_socket.close();
this._resetState();
}
super.unsubscribe();
if (!source) {
this.destination = new ReplaySubject();
}
}
}
//# sourceMappingURL=WebSocketSubject.js.map
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