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Check if backward extremity is create event before checking missing state

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Neil Alexander 2020-10-15 11:32:35 +01:00
parent f1bc079965
commit 76c22911b7
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1 changed files with 8 additions and 4 deletions
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12
federationapi/routing/send.go
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@ -546,12 +546,16 @@ func (t *txnReq) processEventWithMissingState(ctx context.Context, e gomatrixser
// 1. Ensures that the state is deduplicated fully for each state-key tuple
// 2. Ensures that we pick the latest events from both sets, in the case that
// one of the prev_events is quite a bit older than the others
var resolvedState *gomatrixserverlib.RespState
resolvedState := &gomatrixserverlib.RespState{}
switch len(states) {
case 0:
// There are no previous states - this is an error condition!
util.GetLogger(ctx).WithError(err).Errorf("Failed to lookup any state after prev_events")
return fmt.Errorf("expected %d states but got %d", len(backwardsExtremity.PrevEventIDs()), len(states))
extremityIsCreate := backwardsExtremity.Type() == gomatrixserverlib.MRoomCreate && backwardsExtremity.StateKeyEquals("")
if !extremityIsCreate {
// There are no previous states and this isn't the beginning of the
// room - this is an error condition!
util.GetLogger(ctx).Errorf("Failed to lookup any state after prev_events")
return fmt.Errorf("expected %d states but got %d", len(backwardsExtremity.PrevEventIDs()), len(states))
}
case 1:
// There's only one previous state - if it's trustworthy (came from a
// local state snapshot which will already have been through state res),