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electron-ws-connection-provider.ts
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electron-ws-connection-provider.ts
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// *****************************************************************************
// Copyright (C) 2019 TypeFox and others.
//
// This program and the accompanying materials are made available under the
// terms of the Eclipse Public License v. 2.0 which is available at
// http://www.eclipse.org/legal/epl-2.0.
//
// This Source Code may also be made available under the following Secondary
// Licenses when the conditions for such availability set forth in the Eclipse
// Public License v. 2.0 are satisfied: GNU General Public License, version 2
// with the GNU Classpath Exception which is available at
// https://www.gnu.org/software/classpath/license.html.
//
// SPDX-License-Identifier: EPL-2.0 OR GPL-2.0-only WITH Classpath-exception-2.0
// *****************************************************************************
import { injectable } from 'inversify';
import { WebSocketConnectionProvider, WebSocketOptions } from '../../browser/messaging/ws-connection-provider';
import { FrontendApplicationContribution } from '../../browser/frontend-application';
import { Channel } from '../../common';
/**
* Customized connection provider between the frontend and the backend in electron environment.
* This customized connection provider makes sure the websocket connection does not try to reconnect
* once the electron-browser window is refreshed. Otherwise, backend resources are not disposed.
*/
@injectable()
export class ElectronWebSocketConnectionProvider extends WebSocketConnectionProvider implements FrontendApplicationContribution {
/**
* Do not try to reconnect when the frontend application is stopping. The browser is navigating away from this page.
*/
protected stopping = false;
onStop(): void {
this.stopping = true;
// Manually close the websocket connections `onStop`. Otherwise, the channels will be closed with 30 sec (`MessagingContribution#checkAliveTimeout`) delay.
// https://github.com/eclipse-theia/theia/issues/6499
// `1001` indicates that an endpoint is "going away", such as a server going down or a browser having navigated away from a page.
this.channelMultiplexer?.onUnderlyingChannelClose({ reason: 'The frontend is "going away"', code: 1001 });
}
override async openChannel(path: string, handler: (channel: Channel) => void, options?: WebSocketOptions): Promise<void> {
if (!this.stopping) {
super.openChannel(path, handler, options);
}
}
}