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Split "timeline" and "state" after applying filtering

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This commit is contained in:
Neil Alexander 2022-10-31 09:35:18 +00:00
parent f10c6f26e5
commit 6c0c369286
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GPG key ID: A02A2019A2BB0944
1 changed files with 12 additions and 6 deletions
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18
syncapi/streams/stream_pdu.go
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@ -251,8 +251,10 @@ func (p *PDUStreamProvider) addRoomDeltaToResponse(
}
return r.From, fmt.Errorf("p.DB.RecentEvents: %w", err)
}
recentEvents := snapshot.StreamEventsToEvents(device, recentStreamEvents)
delta.StateEvents = removeDuplicates(delta.StateEvents, recentEvents) // roll back
recentEvents := gomatrixserverlib.HeaderedReverseTopologicalOrdering(
snapshot.StreamEventsToEvents(device, recentStreamEvents),
gomatrixserverlib.TopologicalOrderByPrevEvents,
)
prevBatch, err := snapshot.GetBackwardTopologyPos(ctx, recentStreamEvents)
if err != nil {
return r.From, fmt.Errorf("p.DB.GetBackwardTopologyPos: %w", err)
@ -263,10 +265,6 @@ func (p *PDUStreamProvider) addRoomDeltaToResponse(
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)
// Work out what the highest stream position is for all of the events in this
// room that were returned.
latestPosition := r.To
@ -314,6 +312,14 @@ func (p *PDUStreamProvider) addRoomDeltaToResponse(
limited = true
}
// Now that we've filtered the timeline, work out which state events are still
// left. Anything that appears in the filtered timeline will be removed from the
// "state" section and kept in "timeline".
delta.StateEvents = gomatrixserverlib.HeaderedReverseTopologicalOrdering(
removeDuplicates(delta.StateEvents, recentEvents),
gomatrixserverlib.TopologicalOrderByAuthEvents,
)
if len(delta.StateEvents) > 0 {
updateLatestPosition(delta.StateEvents[len(delta.StateEvents)-1].EventID())
}