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Truncate recentStreamEvents before working out which event IDs to exclude from stateEvents (#2281)

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Neil Alexander 2022-03-16 10:18:08 +00:00 committed by GitHub
parent 69268fc48e
commit fc0bdf5d88
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1 changed files with 19 additions and 16 deletions
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35
syncapi/streams/stream_pdu.go
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@ -271,22 +271,6 @@ func (p *PDUStreamProvider) getJoinResponseForCompleteSync(
return
}
// Get the event IDs of the stream events we fetched. There's no point in us
var excludingEventIDs []string
if !wantFullState {
excludingEventIDs = make([]string, 0, len(recentStreamEvents))
for _, event := range recentStreamEvents {
if event.StateKey() != nil {
excludingEventIDs = append(excludingEventIDs, event.EventID())
}
}
}
stateEvents, err := p.DB.CurrentState(ctx, roomID, stateFilter, excludingEventIDs)
if err != nil {
return
}
// TODO FIXME: We don't fully implement history visibility yet. To avoid leaking events which the
// user shouldn't see, we check the recent events and remove any prior to the join event of the user
// which is equiv to history_visibility: joined
@ -314,6 +298,25 @@ func (p *PDUStreamProvider) getJoinResponseForCompleteSync(
limited = false // so clients know not to try to backpaginate
}
// Work our way through the timeline events and pick out the event IDs
// of any state events that appear in the timeline. We'll specifically
// exclude them at the next step, so that we don't get duplicate state
// events in both `recentStreamEvents` and `stateEvents`.
var excludingEventIDs []string
if !wantFullState {
excludingEventIDs = make([]string, 0, len(recentStreamEvents))
for _, event := range recentStreamEvents {
if event.StateKey() != nil {
excludingEventIDs = append(excludingEventIDs, event.EventID())
}
}
}
stateEvents, err := p.DB.CurrentState(ctx, roomID, stateFilter, excludingEventIDs)
if err != nil {
return
}
// Retrieve the backward topology position, i.e. the position of the
// oldest event in the room's topology.
var prevBatch *types.TopologyToken