Can I reuse buffer for another send/publish after calling ws.send(buffer)/app.publish("foo", buffer)?

[josephrocca]

If I call ws.send(buffer) or app.publish("foo", buffer), then can i immediately use that buffer again? I.e. does uWebSockets.js now "own" that buffer (hence unsafe to use), or does it make a copy (or pass to OS synchronously, or whatever)? My use case is I need to send basically the same buffer multiple times (synchronously in a loop), but with a slight change each time.

And relatedly: Can I modify the buffer received via message callback, and then ws.send(buffer)/ws.publish(buffer) it (synchronusly)? I saw it mentioned somewhere that once the synchronous phrase of the message callback ends, uWebSocket.js "neuters" the buffer. I'm wondering if, before that synchronous phase ends, is it safe to modify the buffer, and then send/publish it?

[uNetworkingAB]

before that synchronous phase ends, is it safe to modify the buffer, and then send/publish it?

Yes if you don't change the size (obviously)

If I call ws.send(buffer) or app.publish("foo", buffer), then can i immediately use that buffer again?

Yes. The only call where this is not true, is tryEnd.

[josephrocca]

Thank you! 🙏