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/** The options for the Aleph.js server. */export type ServerOptions = Omit<ServeInit, "onError"> & { certFile?: string; keyFile?: string; onError?: ErrorHandler;} & AlephConfig;
/** Start the Aleph.js server. */export function serve(options: ServerOptions = {}) { const { baseUrl, loaders, middlewares, onError, build: buildOptions, router: routerConfig, session, ssr, unocss } = options; const appDir = baseUrl ? fromFileUrl(new URL(".", baseUrl)) : undefined; const buildMode = Deno.args.includes("--build") || Deno.args.includes("-O"); const isDev = Deno.args.includes("--dev");
// inject aleph config to global const config: AlephConfig = { baseUrl, loaders, middlewares, build: buildOptions, router: routerConfig, session, ssr, unocss, }; Reflect.set(globalThis, "__ALEPH_CONFIG", config);
// check `_export.ts` imports if (routerConfig && routerConfig.routes) { if (isDev) { routerConfig.routes = undefined; } else if (util.isFilledArray(routerConfig.routes.depGraph?.modules)) { // restore the dependency graph from the re-import route modules routerConfig.routes.depGraph.modules.forEach((module) => { depGraph.mark(module.specifier, module); }); } }
const alephHandler = async (req: Request, ctx: Context): Promise<Response> => { const { pathname, searchParams } = new URL(req.url);
// handle HMR socket if (pathname === "/-/hmr") { if (isDev) { return handleHMR(req); } const { socket, response } = Deno.upgradeWebSocket(req); socket.addEventListener("open", () => { // close the hot-reloading websocket and tell the client to reload the page socket.send(JSON.stringify({ type: "reload" })); setTimeout(() => { socket.close(); }, 50); }); return response; }
// check if the "out" directory exists const outDir = await globalIt("__ALEPH_OUT_DIR", async () => { if (!isDev && !buildMode) { const outDir = join(appDir ?? Deno.cwd(), buildOptions?.outputDir ?? "./output"); if (await existsDir(outDir)) { return outDir; } } return null; });
// transform modules let loader: ModuleLoader | undefined; if ( !searchParams.has("raw") && ( (loader = loaders?.find((l) => l.test(pathname))) || transformer.test(pathname) ) ) { // check the optimized output if (!isDev && !buildMode && outDir) { let outFile = join(outDir, pathname); if (pathname.startsWith("/-/") && isNpmPkg(restoreUrl(pathname))) { outFile += ".js"; } if (await existsFile(outFile)) { const file = await Deno.open(outFile, { read: true }); const headers = new Headers(); if (outFile.endsWith(".css")) { headers.set("Content-Type", "text/css; charset=utf-8"); } else { headers.set("Content-Type", "application/javascript; charset=utf-8"); } if (searchParams.get("v") || (pathname.startsWith("/-/") && regFullVersion.test(pathname))) { headers.append("Cache-Control", "public, max-age=31536000, immutable"); } return new Response(file.readable, { headers }); } } try { const [importMap, jsxConfig] = await Promise.all([ getImportMap(appDir), getJSXConfig(appDir), ]); return await transformer.fetch(req, { importMap, jsxConfig, loader, isDev, }); } catch (err) { if (err instanceof TransformError) { // todo: format error message in terminal log.error(err.message); const alephPkgUri = toLocalPath(getAlephPkgUri()); return new Response( `import { showTransformError } from "${alephPkgUri}/runtime/core/error.ts";showTransformError(${ JSON.stringify(err) });export default null;`, { headers: [ ["Content-Type", "application/javascript; charset=utf-8"], ["X-Transform-Error", "true"], ], }, ); } else if (!(err instanceof Deno.errors.NotFound)) { log.error(err); return onError?.(err, "transform", req, ctx) ?? 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, "fs", req, ctx) ?? new Response(generateErrorHtml(err.stack ?? err.message), { status: 500, headers: [["Content-Type", "text/html;"]], }); } } }
// request route api const router: Router | null = await globalIt("__ALEPH_ROUTER", () => initRouter(routerConfig, appDir));
if (pathname === "/aleph.getStaticPaths") { if (router) { const pattern = searchParams.get("pattern"); const route = router.routes.find(([_, r]) => r.pattern.pathname === pattern); if (route) { const mod = await importRouteModule(route[1]); if (typeof mod.getStaticPaths === "function") { let ret = mod.getStaticPaths(); if (ret instanceof Promise) { ret = await ret; } if (Array.isArray(ret)) { return Response.json(ret); } } } } return Response.json([]); }
if (router && router.routes.length > 0) { const _data_ = req.method === "GET" && (searchParams.has("_data_") || req.headers.get("Accept") === "application/json"); try { const resp = await fetchRouteData(req, ctx, router, _data_); if (resp) { return resp; } } catch (err) { // javascript syntax error if (err instanceof TypeError && !_data_) { return new Response(generateErrorHtml(err.stack ?? err.message), { status: 500, headers: [["Content-Type", "text/html;"]], }); }
// use the `onError` if available const res = onError?.(err, "route-data-fetch", req, ctx); if (res instanceof Response) { return fixResponse(res, _data_); }
// user throws a response if (err instanceof Response) { return fixResponse(err, _data_); }
// 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 }); } }
// don't render those special asset files switch (pathname) { case "/favicon.ico": case "/robots.txt": return new Response("Not found", { status: 404 }); }
const indexHtml = await globalIt( "__ALEPH_INDEX_HTML", () => loadIndexHtml(join(appDir ?? ".", "index.html"), { ssr: Boolean(ssr), hmr: isDev ? { wsUrl: Deno.env.get("HMR_WS_URL") } : undefined, }), ); if (!indexHtml) { return new Response("Not found", { status: 404 }); }
// return index.html if (!ssr) { return createHtmlResponse(req, join(appDir ?? ".", "./index.html"), indexHtml); }
// check SSG output if (!isDev && !buildMode && outDir) { const htmlFile = join(outDir, pathname === "/" ? "index.html" : pathname + ".html"); if (await existsFile(htmlFile)) { return createHtmlResponse(req, htmlFile); } }
// SSR try { return await renderer.fetch(req, ctx, { indexHtml, router, ssr, isDev, }); } 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); } return new Response(generateErrorHtml(message, "SSR"), { headers: { "Cache-Control": "public, max-age=0, must-revalidate", "Content-Type": "text/html; charset=utf-8", }, }); } };
// the final server handler const handler = (req: Request, connInfo: ConnInfo): Promise<Response> | Response => { const next = (i: number): Promise<Response> | Response => { if (Array.isArray(middlewares) && i < middlewares.length) { const mw = middlewares[i]; const ctx = createContext(req, next.bind(null, i + 1), { connInfo, session }); try { return mw.fetch(req, ctx); } catch (err) { const res = onError?.(err, "middleware", req, 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; charset=utf-8"]], }); } } const ctx = createContext(req, () => Promise.resolve(new Response(null)), { connInfo, session }); return alephHandler(req, ctx); }; return next(0); };
// set log level to debug when debug aleph.js itself. if (import.meta.url.startsWith("file:")) { log.setLevel("debug"); }
// build the app for production if (buildMode) { build(handler, config, appDir); return; }
const { hostname = "localhost", certFile, keyFile, signal } = options; const tls = certFile && keyFile;
let port = options.port ?? 3000; if (!options.port) { const m = Deno.args.join(" ").match(/(--port|-P)(\s+|=)(\d+)/); if (m) { port = parseInt(m[3]); } }
try { Deno.env.set("ALEPH_SERVER_ORIGIN", `${tls ? "https" : "http"}://${hostname}:${port}`); } catch (_) { // deno deploy: Can not modify env vars during execution. }
// watch file changes in development mode if (isDev) { watch(Deno.args.includes("--generate"), appDir); }
const onListen = (arg: { port: number; hostname: string }) => { if (!getDeploymentId()) { log.info(`Server ready on ${tls ? "https" : "http"}://${hostname}:${port}`); } options.onListen?.(arg); }; if (tls) { serveTls(handler, { hostname, port, certFile, keyFile, signal, onListen }); } else { stdServe(handler, { hostname, port, signal, onListen }); }}
export function setLogLeavel(level: LevelName) { log.setLevel(level);}
// inject the `__aleph` global variableReflect.set(globalIt, "__aleph", { getRouteModule: () => { throw new Error("only available in client-side"); }, importRouteModule: async (filename: string) => { let router: Router | Promise<Router> | undefined = Reflect.get(globalThis, "__ALEPH_ROUTER"); if (router) { if (router instanceof Promise) { router = await router; } const route = router.routes.find(([, meta]) => meta.filename === filename); if (route) { return importRouteModule(route[1]); } } return importRouteModule({ filename, pattern: { pathname: "" } }); },});