Function startServer

packages/cli/src/server.ts:66–102

(opts: ServerOptions)

const DEFAULT_MAX_PORT_ATTEMPTS = 100;

export async function startServer(opts: ServerOptions): Promise<ServerHandle> {
	const webDist = path.resolve(opts.webDistPath ?? DEFAULT_WEB_DIST);
	const compiled = (opts.routes ?? []).map(compileRoute);
	const startPort = opts.port ?? DEFAULT_START_PORT;
	const maxPortAttempts = opts.maxPortAttempts ?? DEFAULT_MAX_PORT_ATTEMPTS;

	for (let i = 0; i < maxPortAttempts; i++) {
		const port = startPort + i;
		const server = http.createServer((req, res) => {
			handleRequest(req, res, webDist, compiled).catch((err) => {
				const msg = err instanceof Error ? err.message : String(err);
				process.stderr.write(`request handler error: ${msg}\n`);
				if (!res.headersSent) {
					res.writeHead(500, { "Content-Type": "text/plain" });
				}
				res.end("Internal Server Error");
			});
		});

		try {
			await listen(server, port);
			return {
				port,
				close: () =>
					new Promise<void>((resolve, reject) => {
						server.close((err) => (err ? reject(err) : resolve()));
					}),
			};
		} catch (err) {
			if (!isPortUnavailable(err)) throw err;
		}
	}

	throw new Error(
		`Could not find a free port in range ${startPort}-${startPort + maxPortAttempts - 1}`,
	);
}

function listen(server: http.Server, port: number): Promise<void> {
	return new Promise<void>((resolve, reject) => {