First-class WebSocket server support

[MarkTiedemann]

I like the design of the new Deno.serveHttp API. I think a similar design would work well for WebSockets, too.

Example API:

async function acceptWebSocket(
  conn: Deno.Conn,
  httpConn: Deno.RequestEvent
): Promise<WebSocket> {}

Example usage:

for await (const conn of Deno.listen({ port: 80 })) {
  handleConn(conn);
}

async function handleConn(conn: Deno.Conn) {
  for await (const httpConn of Deno.serveHttp(conn)) {
    handleHttpConn(conn, httpConn);
  }
}

async function handleHttpConn(conn: Deno.Conn, httpConn: Deno.RequestEvent) {
  try {
    const ws = await Deno.acceptWebSocket(conn, httpConn);
    ws.onopen = todo;
    ws.onmessage = todo;
    ws.onerror = todo;
    ws.onclose = todo;
  } catch {
    httpConn.respondWith(new Response("Failed to accept WebSocket", { status: 400 }));
  }
}

function todo() {}

[crowlKats]

Duplicate of #10211

[lucacasonato]

Closing as duplicate of #10211