core/pyright-language-server/src/language-server-runner.ts

/**
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you 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 { WebSocketServer } from "ws";
import { Server } from 'node:http';
import express from 'express';
import { getLocalDirectory, LanguageServerRunConfig, upgradeWsServer } from './server-commons.ts';

/** LSP server runner */
export const runLanguageServer = (
    languageServerRunConfig: LanguageServerRunConfig
) => {
    process.on('uncaughtException', err => {
        console.error('Uncaught Exception: ', err.toString());
        if (err.stack !== undefined) {
            console.error(err.stack);
        }
    });

    // create the express application
    const app = express();
    // server the static content, i.e. index.html
    const dir = getLocalDirectory(import.meta.url);
    app.use(express.static(dir));
    // start the http server
    const httpServer: Server = app.listen(languageServerRunConfig.serverPort);
    const wss = new WebSocketServer(languageServerRunConfig.wsServerOptions);
    // create the web socket
    upgradeWsServer(languageServerRunConfig, {
        server: httpServer,
        wss
    });
};