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Move prev_batch calculation (#2856)

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This might help #2847.
This commit is contained in:
Neil Alexander 2022-11-03 16:56:21 +00:00 committed by GitHub
parent fb2e7d1b05
commit 98d3f88bfb
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3 changed files with 29 additions and 28 deletions
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2
syncapi/storage/interface.go
View file

@ -47,7 +47,7 @@ type DatabaseTransaction interface {
MembershipCount(ctx context.Context, roomID, membership string, pos types.StreamPosition) (int, error)
GetRoomHeroes(ctx context.Context, roomID, userID string, memberships []string) ([]string, error)
RecentEvents(ctx context.Context, roomID string, r types.Range, eventFilter *gomatrixserverlib.RoomEventFilter, chronologicalOrder bool, onlySyncEvents bool) ([]types.StreamEvent, bool, error)
GetBackwardTopologyPos(ctx context.Context, events []types.StreamEvent) (types.TopologyToken, error)
GetBackwardTopologyPos(ctx context.Context, events []*gomatrixserverlib.HeaderedEvent) (types.TopologyToken, error)
PositionInTopology(ctx context.Context, eventID string) (pos types.StreamPosition, spos types.StreamPosition, err error)
InviteEventsInRange(ctx context.Context, targetUserID string, r types.Range) (map[string]*gomatrixserverlib.HeaderedEvent, map[string]*gomatrixserverlib.HeaderedEvent, types.StreamPosition, error)
PeeksInRange(ctx context.Context, userID, deviceID string, r types.Range) (peeks []types.Peek, err error)

2
syncapi/storage/shared/storage_sync.go
View file

@ -259,7 +259,7 @@ func (d *DatabaseTransaction) StreamToTopologicalPosition(
// oldest event in the room's topology.
func (d *DatabaseTransaction) GetBackwardTopologyPos(
ctx context.Context,
events []types.StreamEvent,
events []*gomatrixserverlib.HeaderedEvent,
) (types.TopologyToken, error) {
zeroToken := types.TopologyToken{}
if len(events) == 0 {

53
syncapi/streams/stream_pdu.go
View file

@ -255,10 +255,6 @@ func (p *PDUStreamProvider) addRoomDeltaToResponse(
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)
}
// If we didn't return any events at all then don't bother doing anything else.
if len(recentEvents) == 0 && len(delta.StateEvents) == 0 {
@ -312,6 +308,11 @@ func (p *PDUStreamProvider) addRoomDeltaToResponse(
limited = true
}
prevBatch, err := snapshot.GetBackwardTopologyPos(ctx, events)
if err != nil {
return r.From, fmt.Errorf("p.DB.GetBackwardTopologyPos: %w", err)
}
// 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".
@ -489,28 +490,6 @@ func (p *PDUStreamProvider) getJoinResponseForCompleteSync(
return
}
// Retrieve the backward topology position, i.e. the position of the
// oldest event in the room's topology.
var prevBatch *types.TopologyToken
if len(recentStreamEvents) > 0 {
var backwardTopologyPos, backwardStreamPos types.StreamPosition
event := recentStreamEvents[0]
// If this is the beginning of the room, we can't go back further. We're going to return
// the TopologyToken from the last event instead. (Synapse returns the /sync next_Batch)
if event.Type() == gomatrixserverlib.MRoomCreate && event.StateKeyEquals("") {
event = recentStreamEvents[len(recentStreamEvents)-1]
}
backwardTopologyPos, backwardStreamPos, err = snapshot.PositionInTopology(ctx, event.EventID())
if err != nil {
return
}
prevBatch = &types.TopologyToken{
Depth: backwardTopologyPos,
PDUPosition: backwardStreamPos,
}
prevBatch.Decrement()
}
p.addRoomSummary(ctx, snapshot, jr, roomID, device.UserID, r.From)
// We don't include a device here as we don't need to send down
@ -545,6 +524,28 @@ func (p *PDUStreamProvider) getJoinResponseForCompleteSync(
}
}
// Retrieve the backward topology position, i.e. the position of the
// oldest event in the room's topology.
var prevBatch *types.TopologyToken
if len(events) > 0 {
var backwardTopologyPos, backwardStreamPos types.StreamPosition
event := events[0]
// If this is the beginning of the room, we can't go back further. We're going to return
// the TopologyToken from the last event instead. (Synapse returns the /sync next_Batch)
if event.Type() == gomatrixserverlib.MRoomCreate && event.StateKeyEquals("") {
event = events[len(events)-1]
}
backwardTopologyPos, backwardStreamPos, err = snapshot.PositionInTopology(ctx, event.EventID())
if err != nil {
return
}
prevBatch = &types.TopologyToken{
Depth: backwardTopologyPos,
PDUPosition: backwardStreamPos,
}
prevBatch.Decrement()
}
jr.Timeline.PrevBatch = prevBatch
jr.Timeline.Events = gomatrixserverlib.HeaderedToClientEvents(events, gomatrixserverlib.FormatSync)
// If we are limited by the filter AND the history visibility filter