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/**
* ============LICENSE_START========================================================================
* ONAP : ccsdk feature sdnr wt odlux
* =================================================================================================
* Copyright (C) 2019 highstreet technologies GmbH Intellectual Property. All rights reserved.
* =================================================================================================
* 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.
* ============LICENSE_END==========================================================================
*/
import * as X2JS from 'x2js';
import { ApplicationStore } from '../store/applicationStore';
import { SetWebsocketAction } from '../actions/websocketAction';
const socketUrl = [location.protocol === 'https:' ? 'wss://' : 'ws://', 'admin', ':', 'admin', '@', location.hostname, ':', location.port, '/websocket'].join('');
const subscriptions: { [scope: string]: SubscriptionCallback[] } = {};
let socketReady: Promise<WebSocket>;
let userLoggedOut = false;
let wasWebsocketConnectionEstablished: undefined | boolean;
let applicationStore: ApplicationStore | null;
export interface IFormatedMessage {
notifType: string | null;
time: string;
}
export type SubscriptionCallback<TMessage extends IFormatedMessage = IFormatedMessage> = (msg: TMessage) => void;
function formatData(event: MessageEvent): IFormatedMessage | undefined {
var x2js = new X2JS();
var jsonObj: { [key: string]: IFormatedMessage } = x2js.xml2js(event.data);
if (jsonObj && typeof (jsonObj) === 'object') {
const notifType = Object.keys(jsonObj)[0];
const formated = jsonObj[notifType];
formated.notifType = notifType;
formated.time = new Date().toISOString();
return formated;
}
return undefined;
}
export function subscribe<TMessage extends IFormatedMessage = IFormatedMessage>(scope: string | string[], callback: SubscriptionCallback<TMessage>): boolean {
const scopes = scope instanceof Array ? scope : [scope];
// send all new scopes to subscribe
const newScopesToSubscribe: string[] = scopes.reduce((acc: string[], cur: string) => {
const currentCallbacks = subscriptions[cur];
if (currentCallbacks) {
if (!currentCallbacks.some(c => c === callback)) {
currentCallbacks.push(callback);
}
} else {
subscriptions[cur] = [callback];
acc.push(cur);
}
return acc;
}, []);
if (newScopesToSubscribe.length === 0) {
return true;
}
return true;
}
export function unsubscribe<TMessage extends IFormatedMessage = IFormatedMessage>(scope: string | string[], callback: SubscriptionCallback<TMessage>): Promise<boolean> {
return socketReady.then((notificationSocket) => {
const scopes = scope instanceof Array ? scope : [scope];
scopes.forEach(s => {
const callbacks = subscriptions[s];
const index = callbacks && callbacks.indexOf(callback);
if (index > -1) {
callbacks.splice(index, 1);
}
if (callbacks.length === 0) {
subscriptions[s] === undefined;
}
});
// send a subscription to all active scopes
const scopesToSubscribe = Object.keys(subscriptions);
if (notificationSocket.readyState === notificationSocket.OPEN) {
const data = {
'data': 'scopes',
'scopes': scopesToSubscribe
};
notificationSocket.send(JSON.stringify(data));
return true;
}
return false;
});
}
export const startNotificationService = (store: ApplicationStore) => {
applicationStore = store;
}
const connect = (): Promise<WebSocket> => {
return new Promise((resolve, reject) => {
const notificationSocket = new WebSocket(socketUrl);
notificationSocket.onmessage = (event) => {
// process received event
if (typeof event.data === 'string') {
const formated = formatData(event);
if (formated && formated.notifType) {
const callbacks = subscriptions[formated.notifType];
if (callbacks) {
callbacks.forEach(cb => {
// ensure all callbacks will be called
try {
return cb(formated);
} catch (reason) {
console.error(reason);
}
});
}
}
}
};
notificationSocket.onerror = function (error) {
console.log("Socket error:");
console.log(error);
reject("Socket error: " + error);
if (applicationStore) {
applicationStore.dispatch(new SetWebsocketAction(false));
}
};
notificationSocket.onopen = function (event) {
if (applicationStore) {
applicationStore.dispatch(new SetWebsocketAction(true));
}
console.log("Socket connection opened.");
resolve(notificationSocket);
// send a subscription to all active scopes
const scopesToSubscribe = Object.keys(subscriptions);
if (notificationSocket.readyState === notificationSocket.OPEN) {
const data = {
'data': 'scopes',
'scopes': scopesToSubscribe
};
notificationSocket.send(JSON.stringify(data));
};
};
notificationSocket.onclose = function (event) {
console.log("socket connection closed");
if (applicationStore) {
applicationStore.dispatch(new SetWebsocketAction(false));
}
if (!userLoggedOut) {
socketReady = connect();
}
};
});
}
export const startWebsocketSession = () => {
socketReady = connect();
userLoggedOut = false;
}
export const endWebsocketSession = () => {
if (socketReady) {
socketReady.then(websocket => {
websocket.close();
userLoggedOut = true;
});
}
}
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