ra-realtime/src/createObserverChannel.js

A saga enabling realtime updates for react-admin

import { eventChannel } from 'redux-saga';
import realtimeObserver from './realtimeObserver';

export const createSubscribeFactory = realtimeObserverImpl => (
    watcher,
    emitter
) => {
    const observer = realtimeObserverImpl(emitter);
    const result = watcher.subscribe(observer);

    return result.unsubscribe;
};

export default watcher =>
    eventChannel(emitter =>
        createSubscribeFactory(realtimeObserver)(watcher, emitter)
    );