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Fix ordering issues in requesting backfill (#3530)

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Using a map means the events are processed in an indeterminate order,
which causes a lot of `/state_ids` requests as the `prev_events` are not
known when the order is lost.

Signed-off-by: Neil Alexander <git@neilalexander.dev>

---------

Signed-off-by: Neil Alexander <git@neilalexander.dev>
Co-authored-by: Neil Alexander <neilalexander@users.noreply.github.com>
This commit is contained in:
Neil 2025-05-16 16:11:29 +01:00 • committed by GitHub
parent c15dee80f2
commit 9de69bc53a
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2 changed files with 7 additions and 46 deletions
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14
roomserver/internal/perform/perform_backfill.go
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@ -128,9 +128,9 @@ func (r *Backfiller) backfillViaFederation(ctx context.Context, req *api.Perform
logrus.WithError(err).WithField("room_id", req.RoomID).Infof("backfilled %d events", len(events))
// persist these new events - auth checks have already been done
roomNID, backfilledEventMap := persistEvents(ctx, r.DB, r.Querier, events)
roomNID, storedEvents := persistEvents(ctx, r.DB, r.Querier, events)
for _, ev := range backfilledEventMap {
for _, ev := range storedEvents {
// now add state for these events
stateIDs, ok := requester.eventIDToBeforeStateIDs[ev.EventID()]
if !ok {
@ -591,10 +591,10 @@ func joinEventsFromHistoryVisibility(
return evs, visibility, err
}
func persistEvents(ctx context.Context, db storage.Database, querier api.QuerySenderIDAPI, events []gomatrixserverlib.PDU) (types.RoomNID, map[string]types.Event) {
func persistEvents(ctx context.Context, db storage.Database, querier api.QuerySenderIDAPI, events []gomatrixserverlib.PDU) (types.RoomNID, []types.Event) {
var roomNID types.RoomNID
var eventNID types.EventNID
backfilledEventMap := make(map[string]types.Event)
storedEvents := make([]types.Event, 0, len(events))
for j, ev := range events {
nidMap, err := db.EventNIDs(ctx, ev.AuthEventIDs())
if err != nil { // this shouldn't happen as RequestBackfill already found them
@ -647,10 +647,10 @@ func persistEvents(ctx context.Context, db storage.Database, querier api.QuerySe
ev = redactedEvent
events[j] = ev
}
backfilledEventMap[ev.EventID()] = types.Event{
storedEvents = append(storedEvents, types.Event{
EventNID: eventNID,
PDU: ev,
}
})
}
return roomNID, backfilledEventMap
return roomNID, storedEvents
}