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Add http fallback for unavailable websockets
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103 changes: 103 additions & 0 deletions
103
packages/core/src/node/messaging/http-websocket-adapter.ts
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,103 @@ | ||
| /******************************************************************************** | ||
| * Copyright (C) 2021 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 WITH Classpath-exception-2.0 | ||
| ********************************************************************************/ | ||
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| import * as ws from 'ws'; | ||
| import { inject, injectable } from 'inversify'; | ||
| import { CancellationTokenSource } from '../../common'; | ||
| import { Deferred, timeout } from '../../common/promise-util'; | ||
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| export const HttpWebsocketAdapterFactory = Symbol('HttpWebsocketAdapterFactory'); | ||
| export const HttpWebsocketAdapterTimeout = Symbol('HttpWebsocketAdapterTimeout'); | ||
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| export const DEFAULT_HTTP_WEBSOCKET_ADAPTER_TIMEOUT = 4000; | ||
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| @injectable() | ||
| export class HttpWebsocketAdapter { | ||
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| @inject(HttpWebsocketAdapterTimeout) | ||
| protected readonly adapterTimeout: number; | ||
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| readyState: number = ws.OPEN; | ||
| alive: boolean = true; | ||
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| protected pendingTimeout?: CancellationTokenSource; | ||
| protected pendingMessages: unknown[] = []; | ||
| protected deferredMessageHandler: Deferred<unknown[]> = new Deferred(); | ||
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| getPendingMessages(): Promise<unknown[]> { | ||
| this.alive = true; | ||
| this.deferredMessageHandler = new Deferred(); | ||
| if (!this.pendingMessages.length) { | ||
| this.pendingTimeout = new CancellationTokenSource(); | ||
| timeout(this.adapterTimeout, this.pendingTimeout.token) | ||
| .then(() => this.deferredMessageHandler.resolve([])) | ||
| .catch(() => { }); | ||
| } else { | ||
| this.deferredMessageHandler.resolve(this.pendingMessages); | ||
| this.pendingMessages = []; | ||
| } | ||
| return this.deferredMessageHandler.promise; | ||
| } | ||
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| protected _onerror: (error: Error) => void; | ||
| protected _onclose: (code?: number, reason?: string) => void; | ||
| protected _onmessage: (data: string) => void; | ||
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| onerror(error: Error): void { | ||
| if (this._onerror) { | ||
| this._onerror(error); | ||
| } | ||
| } | ||
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| onclose(code?: number, reason?: string): void { | ||
| this.readyState = ws.CLOSING; | ||
| if (this._onclose) { | ||
| this._onclose(code, reason); | ||
| } | ||
| this.readyState = ws.CLOSED; | ||
| } | ||
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| onmessage(data: string): void { | ||
| if (this._onmessage) { | ||
| this._onmessage(data); | ||
| } | ||
| } | ||
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| send(data: unknown): void { | ||
| this.pendingMessages.push(data); | ||
| if (this.deferredMessageHandler.state === 'unresolved') { | ||
| this.pendingTimeout?.cancel(); | ||
| this.deferredMessageHandler.resolve(this.pendingMessages); | ||
| this.pendingMessages = []; | ||
| } | ||
| } | ||
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| // Events | ||
| on(event: 'close', listener: (this: WebSocket, code?: number, reason?: string) => void): this; | ||
| on(event: 'error', listener: (this: WebSocket, err: Error) => void): this; | ||
| on(event: 'message', listener: (this: WebSocket, data: ws.Data) => void): this; | ||
| // eslint-disable-next-line @typescript-eslint/no-explicit-any | ||
| on(event: string | symbol, listener: (this: WebSocket, ...args: any[]) => void): this { | ||
| if (event === 'error') { | ||
| this.onerror = listener; | ||
| } else if (event === 'message') { | ||
| this.onmessage = listener; | ||
| } else if (event === 'close') { | ||
| this.onclose = listener; | ||
| } | ||
| return this; | ||
| } | ||
| } |
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