websocket send frame from non suspending progress listener

Hello. I’m facing problem with webockets. I want to send frame each time my “manager” calls listener with progress.

        webSocket("/blockChainSyncProgress") {
            manager.addBlockChainProgressListener { progress ->
                launch {
                    outgoing.send(Frame.Text("$progress"))
                }
            }
        }

since the .addBlockChainProgressListener is not suspending function, websocket will close after the listener is added. I can add while (isActive) delay(1000) so the function looks like:

        webSocket("/blockChainSyncProgress") {
            manager.addBlockChainProgressListener { progress ->
                launch {
                    outgoing.send(Frame.Text("$progress"))
                }
            }
            while (isActive) delay(1000)
        }

but I’m not sure if it’s the recommended way of doing that.

[cy6erGn0m]

Also note that it looks like you are not unsubscribing: is that ok in your particular case? Shouldn’t you remove listener once a client get disconnected?

[cy6erGn0m]

The other alternative is to use a global instance of BroadcastConflatedChannel to publush manager’s current state and subscribe client’s session. Unfortunately this API is still experimental