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/** The options for the Aleph.js server. */export type ServerOptions = Omit<ServeInit, "onError"> & { certFile?: string; keyFile?: string; logLevel?: LevelName; session?: SessionOptions; middlewares?: Middleware[]; fetch?: FetchHandler; ssr?: SSR; onError?: ErrorHandler;} & AlephConfig;
/** Start the Aleph.js server. */export function serve(options: ServerOptions = {}) { const { baseUrl, build, fetch, middlewares, loaders, onError, routes, routeModules, ssr, unocss, } = options; const appDir = options?.baseUrl ? new URL(".", options.baseUrl).pathname : undefined; const isDev = Deno.env.get("ALEPH_ENV") === "development";
// set the log level if specified if (options.logLevel) { log.setLevel(options.logLevel); }
// inject the config to global const config: AlephConfig = { baseUrl, build, routes, routeModules, unocss, loaders }; Reflect.set(globalThis, "__ALEPH_CONFIG", config);
// restore the dependency graph from the re-import route modules if (!isDev && routeModules && util.isFilledArray(routeModules.depGraph?.modules)) { routeModules.depGraph.modules.forEach((module) => { depGraph.mark(module.specifier, module); }); }
// server handler const handler = async ( req: Request, connInfo: ConnInfo, ): Promise<Response> => { const { pathname, searchParams } = new URL(req.url);
// close the hot-reloading websocket and tell the client to reload the page if (pathname === "/-/hmr") { const { socket, response } = Deno.upgradeWebSocket(req); socket.addEventListener("open", () => { socket.send(JSON.stringify({ type: "reload" })); setTimeout(() => { socket.close(); }, 50); }); return response; }
const postMiddlewares: Middleware[] = []; const customHTMLRewriter: [ selector: string, handlers: HTMLRewriterHandlers, ][] = []; const ctx = createContext(req, { connInfo, customHTMLRewriter });
// use eager middlewares if (Array.isArray(middlewares)) { for (let i = 0, l = middlewares.length; i < l; i++) { const mw = middlewares[i]; const handler = mw.fetch; if (typeof handler === "function") { if (mw.eager) { try { let res = handler(req, ctx); if (res instanceof Promise) { res = await res; } if (res instanceof Response) { return res; } if (typeof res === "function") { setTimeout(res, 0); } } catch (err) { const res = onError?.(err, { by: "middleware", url: req.url, context: ctx, }); if (res instanceof Response) { return res; } log.error(`[middleare${mw.name ? `(${mw.name})` : ""}]`, err); return new Response(generateErrorHtml(err.stack ?? err.message), { status: 500, headers: [["Content-Type", "text/html"]], }); } } else { postMiddlewares.push(mw); } } } }
// transform modules let loader: ModuleLoader | undefined; if ( !searchParams.has("raw") && (clientModuleTransformer.test(pathname) || (loader = loaders?.find((l) => l.test(pathname)))) ) { try { const importMap = await getImportMap(appDir); const jsxConfig = await getJSXConfig(appDir); return await clientModuleTransformer.fetch(req, { buildTarget: options.build?.target, importMap, jsxConfig, loader, }); } catch (err) { console.log(err); if (err instanceof TransformError) { log.error(err); const alephPkgUri = toLocalPath(getAlephPkgUri()); return new Response( `import { showTransformError } from "${alephPkgUri}/framework/core/error.ts";showTransformError(${ JSON.stringify(err) });export default null;`, { headers: [ ["Content-Type", "application/javascript"], ["X-Transform-Error", "true"], ], }, ); } else if (!(err instanceof Deno.errors.NotFound)) { log.error(err); return onError?.(err, { by: "transform", url: req.url }) ?? new Response(generateErrorHtml(err.stack ?? err.message), { status: 500, headers: [["Content-Type", "text/html"]], }); } } }
// serve static files const contentType = getContentType(pathname); if ( !pathname.startsWith("/.") && contentType !== "application/octet-stream" ) { try { let filePath = appDir ? join(appDir, pathname) : `.${pathname}`; let stat = await Deno.lstat(filePath); if (stat.isDirectory && pathname !== "/") { filePath = `${util.trimSuffix(filePath, "/")}/index.html`; stat = await Deno.lstat(filePath); } if (stat.isFile) { const headers = new Headers({ "Content-Type": contentType }); const deployId = getDeploymentId(); let etag: string | null = null; if (deployId) { etag = `W/${btoa(pathname).replace(/[^a-z0-9]/g, "")}-${deployId}`; } else { const { mtime, size } = stat; if (mtime) { etag = `W/${mtime.getTime().toString(16)}-${size.toString(16)}`; headers.append("Last-Modified", new Date(mtime).toUTCString()); } } if (etag) { if (req.headers.get("If-None-Match") === etag) { return new Response(null, { status: 304 }); } headers.append("ETag", etag); } if (searchParams.get("v") || regFullVersion.test(pathname)) { headers.append( "Cache-Control", "public, max-age=31536000, immutable", ); } const file = await Deno.open(filePath, { read: true }); return new Response(file.readable, { headers }); } } catch (err) { if (!(err instanceof Deno.errors.NotFound)) { log.error(err); return onError?.(err, { by: "fs", url: req.url }) ?? new Response(generateErrorHtml(err.stack ?? err.message), { status: 500, headers: [["Content-Type", "text/html"]], }); } } }
// use post middlewares for (const mw of postMiddlewares) { try { let res = mw.fetch(req, ctx); if (res instanceof Promise) { res = await res; } if (res instanceof Response) { return res; } if (typeof res === "function") { setTimeout(res, 0); } } catch (err) { const res = onError?.(err, { by: "middleware", url: req.url, context: ctx, }); if (res instanceof Response) { return res; } log.error(`[middleare${mw.name ? `(${mw.name})` : ""}]`, err); return new Response(generateErrorHtml(err.stack ?? err.message), { status: 500, headers: [["Content-Type", "text/html"]], }); } }
// use the `fetch` handler if available if (typeof fetch === "function") { return fetch(req, ctx); }
// request route api const routeConfig: RouteConfig | null = await globalIt( "__ALEPH_ROUTE_CONFIG", () => routes ? initRoutes(routes, appDir) : Promise.resolve(null), ); if (routeConfig && routeConfig.routes.length > 0) { const reqData = req.method === "GET" && (searchParams.has("_data_") || req.headers.get("Accept") === "application/json"); try { const resp = await fetchRouteData(req, ctx, routeConfig, reqData); if (resp) { return resp; } } catch (err) { // javascript syntax error if (err instanceof TypeError && !reqData) { return new Response(generateErrorHtml(err.stack ?? err.message), { status: 500, headers: [["Content-Type", "text/html"]], }); }
// use the `onError` if available const res = onError?.(err, { by: "route-data-fetch", url: req.url, context: ctx, }); if (res instanceof Response) { return fixResponse(res, ctx.headers, reqData); }
// user throw a response if (err instanceof Response) { return fixResponse(err, ctx.headers, reqData); }
// prints the error stack if (err instanceof Error || typeof err === "string") { log.error(err); }
// return the error as a json const status: number = util.isUint(err.status ?? err.code) ? err.status ?? err.code : 500; return Response.json({ ...err, status, message: err.message ?? String(err), stack: err.stack, }, { status, headers: ctx.headers, }); } }
// don't render those special asset files switch (pathname) { case "/favicon.ico": case "/robots.txt": return new Response("Not found", { status: 404 }); }
// render html try { const indexHtml = await globalIt( "__ALEPH_INDEX_HTML", () => loadAndFixIndexHtml(join(appDir ?? "./", "index.html"), { ssr: typeof ssr === "function" ? {} : ssr, hmrWebSocketUrl: Deno.env.get("ALEPH_HMR_WS_URL"), isDev, }), ); return renderer.fetch(req, ctx, { indexHtml, routeConfig, customHTMLRewriter, ssr, }); } catch (err) { if (err instanceof Response) { return err; } let message: string; if (err instanceof Error) { message = err.stack as string; log.error("SSR", err); } else { message = err?.toString?.() || String(err); } const cc = ssr && typeof ssr !== "function" ? ssr.cacheControl : "public"; ctx.headers.append("Cache-Control", `${cc}, max-age=0, must-revalidate`); ctx.headers.append("Content-Type", "text/html; charset=utf-8"); return new Response(generateErrorHtml(message, "SSR"), { headers: ctx.headers, }); } };
// start the server const { hostname, port = 3000, certFile, keyFile, signal } = options; if (isDev) { Reflect.set(globalThis, "__ALEPH_SERVER", { handler, hostname, port, certFile, keyFile, signal, onListen: options.onListen, }); } else { const useTls = certFile && keyFile; const onListen = (arg: { port: number; hostname: string }) => { if (!getDeploymentId()) { log.info( `Server ready on ${useTls ? "https" : "http"}://localhost:${port}`, ); } options.onListen?.(arg); }; if (useTls) { serveTls(handler, { hostname, port, certFile, keyFile, signal, onListen }); } else { stdServe(handler, { hostname, port, signal, onListen }); } }}