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Don't waste CPU cycles on an empty response after all

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Neil Alexander 2022-03-25 12:09:49 +00:00
parent 3df6523a32
commit 8a0c2a47e5
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1 changed files with 5 additions and 0 deletions
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5
syncapi/streams/stream_pdu.go
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@ -220,6 +220,11 @@ func (p *PDUStreamProvider) addRoomDeltaToResponse(
return r.From, err
}
// If we didn't return any events at all then don't bother doing anything else.
if len(recentEvents) == 0 && len(delta.StateEvents) == 0 {
return r.To, nil
}
// Sort the events so that we can pick out the latest events from both sections.
recentEvents = gomatrixserverlib.HeaderedReverseTopologicalOrdering(recentEvents, gomatrixserverlib.TopologicalOrderByPrevEvents)
delta.StateEvents = gomatrixserverlib.HeaderedReverseTopologicalOrdering(delta.StateEvents, gomatrixserverlib.TopologicalOrderByAuthEvents)