timing-provider/build/es2019/factories/signaling-factory.js

An implementation of the timing provider specification.

import { Subject, finalize, map, merge, mergeMap, throwError } from 'rxjs';
import { on } from 'subscribable-things';
export const createSignalingFactory = (createWebSocket) => (url) => {
    const errorSubject = new Subject();
    const webSocket = createWebSocket(url);
    const signalingEvent$ = merge(on(webSocket, 'message'), merge(merge(...['close', 'error'].map((type) => on(webSocket, type))).pipe(map(({ type }) => new Error(`WebSocket fired unexpected event of type "${type}".`))), errorSubject
    // tslint:disable-next-line:rxjs-throw-error
    ).pipe(mergeMap((err) => throwError(() => err)))).pipe(finalize(() => webSocket.close()), map((event) => JSON.parse(event.data)));
    const sendSignalingEvent = (event) => {
        try {
            webSocket.send(JSON.stringify(event));
        }
        catch (err) {
            errorSubject.next(err);
        }
    };
    return [signalingEvent$, sendSignalingEvent];
};
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