Sending initial data on request

[filips123]

Is it possible to send initial events/data when the client opens an EventStream request? For example, when a stream starts, I want the server to send some initial/current state, and then also any future updates to the channel (made with send_event) when they happen.

[jkarneges]

Currently, events sent at stream start are limited to events fetched from storage when the client provides a last event ID.

It would be nice to be able to send arbitrary data on start though, potentially even if no storage is configured. Will think about this.

[filips123]

Yeah, in my use case, I don't need (or use) storage, as I'm basically only sending updates when some models change. But when a new client connects, I would like it to send the current state of the models, so the client doesn't need to do another classic HTTP request to obtain it. And in this case, only the client that just connected should receive an event, not all other clients.

Maybe this could be done so EventsViewSet has a method like on_connect that can be overloaded to provide an initial event (or multiple events).