server.sx

// An HTTP server. Run it: sxn examples/server.sx
//
// The handler takes a Request and returns a Response, the same two objects a
// handler on Cloudflare Workers, Deno or Bun receives. `port: 0` asks the OS
// for a free port; pass a real one to pick it yourself.

interface Note {
  id: number;
  text: string;
}

const notes: Map<number, string> = new Map([[1, "the first note"]]);
let mut nextId: number = 2;

const server = Sxn.serve({ port: 0 }, async (req: Request): Promise<Response> => {
  const url = new URL(req.url);

  if (url.pathname === "/") {
    return new Response("try /notes");
  }

  if (url.pathname === "/notes" && req.method === "GET") {
    const all: Note[] = [...notes].map(([id, text]) => ({ id, text }));
    return Response.json(all);
  }

  if (url.pathname === "/notes" && req.method === "POST") {
    const { text } = await req.json();
    const note: Note = { id: nextId++, text };
    notes.set(note.id, note.text);
    return Response.json(note, { status: 201 });
  }

  return new Response("not found", { status: 404 });
});

console.log(`listening on ${server.url}`);

// Call the server we just started, from the same process.
const created = await fetch(`${server.url}/notes`, {
  method: "POST",
  headers: { "content-type": "application/json" },
  body: JSON.stringify({ text: "written by the example" }),
});
console.log("POST /notes ->", created.status, await created.text());

const all = await fetch(`${server.url}/notes`);
console.log("GET  /notes ->", all.status, await all.text());

// Without stop() the listening socket keeps the process alive, which is what
// you want for a real server and not for a script that has finished.
server.stop();