compiler-explorer/lib/app/server.ts

// Copyright (c) 2025, Compiler Explorer Authors
// All rights reserved.
//
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import express from 'express';

import type {AppArguments} from '../app.interfaces.js';
import {logger} from '../logger.js';
import {createRenderHandlers} from './rendering.js';
import {setupBaseServerConfig, setupBasicRoutes, setupLoggingMiddleware} from './server-config.js';
import {ServerDependencies, ServerOptions, WebServerResult} from './server.interfaces.js';
import {setupStaticMiddleware, setupWebPackDevMiddleware} from './static-assets.js';

export {startListening} from './server-listening.js';
export {isMobileViewer} from './url-handlers.js';

/**
 * Configure a web server and its routes
 * @param appArgs - Application arguments
 * @param options - Server options
 * @param dependencies - Server dependencies
 * @returns Web server configuration
 */
export async function setupWebServer(
    appArgs: AppArguments,
    options: ServerOptions,
    dependencies: ServerDependencies,
): Promise<WebServerResult> {
    const webServer = express();
    const router = express.Router();

    let pugRequireHandler;

    try {
        pugRequireHandler = await (appArgs.devMode
            ? setupWebPackDevMiddleware(options, router)
            : setupStaticMiddleware(options, router));
    } catch (err: unknown) {
        const error = err as Error;
        logger.warn(`Error setting up static middleware: ${error.message}`);
        pugRequireHandler = path => `${options.staticRoot}/${path}`;
    }

    const {renderConfig, renderGoldenLayout, embeddedHandler} = createRenderHandlers(
        pugRequireHandler,
        options,
        dependencies,
        appArgs,
    );

    // Add healthcheck before logging middleware to prevent excessive log entries
    webServer.use(dependencies.healthcheckController.createRouter());

    setupBaseServerConfig(options, renderConfig, webServer, router);
    setupLoggingMiddleware(appArgs.devMode, router);

    setupBasicRoutes(
        router,
        renderConfig,
        embeddedHandler,
        dependencies.ceProps,
        dependencies.awsProps,
        options,
        dependencies.clientOptionsHandler,
    );

    return {
        webServer,
        router,
        pugRequireHandler,
        renderConfig,
        renderGoldenLayout,
    };
}