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Tweak "state" and "timeline" filtering (#2844)

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This should stop state events disappearing down a gap where we'd try to
separate out the sections *before* applying history visibility instead
of after.

This may be a better approach than #2843 but I hope @tak-hntlabs will
shout if it isn't.
This commit is contained in:
Neil Alexander 2022-10-31 15:14:08 +00:00 committed by GitHub
parent 66a82e0fa4
commit 7307701a24
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GPG key ID: 4AEE18F83AFDEB23
3 changed files with 20 additions and 10 deletions
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21
syncapi/streams/stream_pdu.go
View file

@ -251,8 +251,10 @@ func (p *PDUStreamProvider) addRoomDeltaToResponse(
} }
return r.From, fmt.Errorf("p.DB.RecentEvents: %w", err) return r.From, fmt.Errorf("p.DB.RecentEvents: %w", err)
} }
recentEvents := snapshot.StreamEventsToEvents(device, recentStreamEvents) recentEvents := gomatrixserverlib.HeaderedReverseTopologicalOrdering(
delta.StateEvents = removeDuplicates(delta.StateEvents, recentEvents) // roll back snapshot.StreamEventsToEvents(device, recentStreamEvents),
gomatrixserverlib.TopologicalOrderByPrevEvents,
)
prevBatch, err := snapshot.GetBackwardTopologyPos(ctx, recentStreamEvents) prevBatch, err := snapshot.GetBackwardTopologyPos(ctx, recentStreamEvents)
if err != nil { if err != nil {
return r.From, fmt.Errorf("p.DB.GetBackwardTopologyPos: %w", err) return r.From, fmt.Errorf("p.DB.GetBackwardTopologyPos: %w", err)
@ -263,10 +265,6 @@ func (p *PDUStreamProvider) addRoomDeltaToResponse(
return r.To, nil 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 // Work out what the highest stream position is for all of the events in this
// room that were returned. // room that were returned.
latestPosition := r.To latestPosition := r.To
@ -314,6 +312,14 @@ func (p *PDUStreamProvider) addRoomDeltaToResponse(
limited = true 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 { if len(delta.StateEvents) > 0 {
updateLatestPosition(delta.StateEvents[len(delta.StateEvents)-1].EventID()) updateLatestPosition(delta.StateEvents[len(delta.StateEvents)-1].EventID())
} }
@ -507,7 +513,6 @@ func (p *PDUStreamProvider) getJoinResponseForCompleteSync(
// transaction IDs for complete syncs, but we do it anyway because Sytest demands it for: // transaction IDs for complete syncs, but we do it anyway because Sytest demands it for:
// "Can sync a room with a message with a transaction id" - which does a complete sync to check. // "Can sync a room with a message with a transaction id" - which does a complete sync to check.
recentEvents := snapshot.StreamEventsToEvents(device, recentStreamEvents) recentEvents := snapshot.StreamEventsToEvents(device, recentStreamEvents)
stateEvents = removeDuplicates(stateEvents, recentEvents)
events := recentEvents events := recentEvents
// Only apply history visibility checks if the response is for joined rooms // Only apply history visibility checks if the response is for joined rooms
@ -521,7 +526,7 @@ func (p *PDUStreamProvider) getJoinResponseForCompleteSync(
// If we are limited by the filter AND the history visibility filter // If we are limited by the filter AND the history visibility filter
// didn't "remove" events, return that the response is limited. // didn't "remove" events, return that the response is limited.
limited = limited && len(events) == len(recentEvents) limited = limited && len(events) == len(recentEvents)
stateEvents = removeDuplicates(stateEvents, recentEvents)
if stateFilter.LazyLoadMembers { if stateFilter.LazyLoadMembers {
if err != nil { if err != nil {
return nil, err return nil, err

7
sytest-blacklist
View file

@ -40,4 +40,9 @@ Accesing an AS-hosted room alias asks the AS server
Guest users can join guest_access rooms Guest users can join guest_access rooms
# This will fail in HTTP API mode, so blacklisted for now # This will fail in HTTP API mode, so blacklisted for now
If a device list update goes missing, the server resyncs on the next one
If a device list update goes missing, the server resyncs on the next one
# Might be a bug in the test because leaves do appear :-(
Leaves are present in non-gapped incremental syncs

2
sytest-whitelist
View file

@ -699,7 +699,7 @@ We do send redundant membership state across incremental syncs if asked
Rejecting invite over federation doesn't break incremental /sync Rejecting invite over federation doesn't break incremental /sync
Gapped incremental syncs include all state changes Gapped incremental syncs include all state changes
Old leaves are present in gapped incremental syncs Old leaves are present in gapped incremental syncs
Leaves are present in non-gapped incremental syncs #Leaves are present in non-gapped incremental syncs
Members from the gap are included in gappy incr LL sync Members from the gap are included in gappy incr LL sync
Presence can be set from sync Presence can be set from sync
/state returns M_NOT_FOUND for a rejected message event /state returns M_NOT_FOUND for a rejected message event