Feature request: onBeforePatch callback for Room

[tonygiang]

I'm requesting an additional onBeforePatch callback that would be called right before each time the room state is sent to the clients in a room. This allows us to modify or read the room state before it is synchronized. Use case: error-correction, server-controlled AI behaviour, analytics logging, other automated processes that can be plugged in/out at will on runtime.

Implementation question: could this callback be awaited under the hood?

[endel]

Hi @tonygiang,

Sounds like this could be helpful indeed! You are referring to the addition of onBeforePatch on the client-side, right?

Allowing to also await for onBeforePatch would complicate things - as we'd need to handle a queue of incoming messages internally while onBeforePatch hasn't finished.

I agree on having an onBeforePatch without the await lock

[tonygiang]

I'm referring to the addition of onBeforePatch on the server-side. State patching is server-authoritative, after all.

[endel]

Landed on 0.15 https://docs.colyseus.io/server/room/#onbeforepatch