openecomp-ui/src/nfvo-utils/WebSocketUtil.js

/*
* Copyright © 2018 European Support Limited
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
*      http: //www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/

import store from 'sdc-app/AppStore.js';
import Configuration from 'sdc-app/config/Configuration.js';
import { actionTypes } from 'sdc-app/onboarding/userNotifications/UserNotificationsConstants.js';
import WorkerUtil from 'nfvo-utils/WorkerUtil';

export const websocketUrl =
    Configuration.get('websocketProtocol') +
    '://' +
    window.location.hostname +
    ':' +
    Configuration.get('websocketPort') +
    '/' +
    Configuration.get('websocketPath');

/***
 * Websocket is treated like a singleton. only need one for the application.
 */
let websocket;
const workerUtil = new WorkerUtil();
export default {
    open(url, { lastScanned }) {
        if (
            websocket === undefined ||
            websocket.readyState === websocket.CLOSED
        ) {
            websocket = new WebSocket(
                `${url}?LAST_DELIVERED_EVENT_ID=${lastScanned}`
            );
            websocket.onmessage = event =>
                store.dispatch({
                    type: actionTypes.NOTIFICATION,
                    data: JSON.parse(event.data)
                });
            websocket.onclose = event => {
                if (event.code && event.code === 1001) {
                    // - Idle Timeout
                    const { lastScanned } = store.getState().notifications;
                    console.log('Reconnecting to Websocket');
                    this.open(websocketUrl, { lastScanned });
                }
            };
            websocket.onerror = () => {
                workerUtil.open();
            };
        }
    },

    close() {
        if (websocket !== undefined) {
            websocket.close();
        }

        workerUtil.close();
    }
};