Hono•4w ago

How to perform an async operation in Web Socket's onMessage?

I'm using Web Sockets with Bun, and wondering what's the idiomatic Hono-way of awaiting a Promise in onMessage (which is a sync method)?

const { upgradeWebSocket, websocket } = createBunWebSocket<ServerWebSocket>();

new Hono().get(
  "/",
  upgradeWebSocket((c) => {
    return {
      onMessage(event, ws) { // not async :(
        // How can await here something, e.g. await Bun.sleep(10);
      },
      ...
    }
  })
)

const { upgradeWebSocket, websocket } = createBunWebSocket<ServerWebSocket>();

new Hono().get(
  "/",
  upgradeWebSocket((c) => {
    return {
      onMessage(event, ws) { // not async :(
        // How can await here something, e.g. await Bun.sleep(10);
      },
      ...
    }
  })
)

I tried to use setTimeout and Promise.then(), but their callbacks are never executed.

1 Reply

CasperX•4w ago

i think you could do something like this

onMessage(event, ws) {
  // do async stuff here
  const innner = async () => {
    // do something
    await Bun.sleep(10);
    // do something else
  }
  inner()
}

onMessage(event, ws) {
  // do async stuff here
  const innner = async () => {
    // do something
    await Bun.sleep(10);
    // do something else
  }
  inner()
}

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How to perform an async operation in Web Socket's onMessage?