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Simplify calculateLatest (#2430)

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* Simplify `calculateLatest`

* Comments
This commit is contained in:
Neil Alexander 2022-05-06 15:52:44 +01:00 committed by GitHub
parent 85c00208c5
commit 6bc6184d70
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1 changed files with 8 additions and 18 deletions
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26
roomserver/internal/input/input_latest_events.go
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@ -316,40 +316,30 @@ func (u *latestEventsUpdater) calculateLatest(
// Then let's see if any of the existing forward extremities now // Then let's see if any of the existing forward extremities now
// have entries in the previous events table. If they do then we // have entries in the previous events table. If they do then we
// will no longer include them as forward extremities. // will no longer include them as forward extremities.
existingPrevs := make(map[string]struct{}) for k, l := range existingRefs {
for _, l := range existingRefs {
referenced, err := u.updater.IsReferenced(l.EventReference) referenced, err := u.updater.IsReferenced(l.EventReference)
if err != nil { if err != nil {
return false, fmt.Errorf("u.updater.IsReferenced: %w", err) return false, fmt.Errorf("u.updater.IsReferenced: %w", err)
} else if referenced { } else if referenced {
existingPrevs[l.EventID] = struct{}{} delete(existingRefs, k)
} }
} }
// Include our new event in the extremities. // Start off with our new unreferenced event. We're reusing the backing
newLatest := []types.StateAtEventAndReference{newStateAndRef} // array here rather than allocating a new one.
u.latest = append(u.latest[:0], newStateAndRef)
// Then run through and see if the other extremities are still valid. // If our new event references any of the existing forward extremities
// If our new event references them then they are no longer good // then they are no longer forward extremities, so remove them.
// candidates.
for _, prevEventID := range newEvent.PrevEventIDs() { for _, prevEventID := range newEvent.PrevEventIDs() {
delete(existingRefs, prevEventID) delete(existingRefs, prevEventID)
} }
// Ensure that we don't add any candidate forward extremities from
// the old set that are, themselves, referenced by the old set of
// forward extremities. This shouldn't happen but guards against
// the possibility anyway.
for prevEventID := range existingPrevs {
delete(existingRefs, prevEventID)
}
// Then re-add any old extremities that are still valid after all. // Then re-add any old extremities that are still valid after all.
for _, old := range existingRefs { for _, old := range existingRefs {
newLatest = append(newLatest, *old) u.latest = append(u.latest, *old)
} }
u.latest = newLatest
return true, nil return true, nil
} }