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Don't include current state in processEventWithMissingState (#1126)

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* Don't include current state in processEventWithMissingState

* Remove lookupCurrentState as not needed

Co-authored-by: Kegsay <kegan@matrix.org>
This commit is contained in:
Neil Alexander 2020-06-29 14:39:21 +01:00 committed by GitHub
parent 1ad7219e4b
commit 4cf45d1ce9
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GPG Key ID: 4AEE18F83AFDEB23
1 changed files with 1 additions and 26 deletions
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27
federationapi/routing/send.go
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@ -404,8 +404,7 @@ func (t *txnReq) processEventWithMissingState(e gomatrixserverlib.Event, roomVer
// at this point we know we're going to have a gap: we need to work out the room state at the new backwards extremity.
// security: we have to do state resolution on the new backwards extremity (TODO: WHY)
// Therefore, we cannot just query /state_ids with this event to get the state before. Instead, we need to query
// the state AFTER all the prev_events for this event, then mix in our current room state and apply state resolution
// to that to get the state before the event.
// the state AFTER all the prev_events for this event, then apply state resolution to that to get the state before the event.
var states []*gomatrixserverlib.RespState
needed := gomatrixserverlib.StateNeededForAuth([]gomatrixserverlib.Event{*backwardsExtremity}).Tuples()
for _, prevEventID := range backwardsExtremity.PrevEventIDs() {
@ -417,13 +416,6 @@ func (t *txnReq) processEventWithMissingState(e gomatrixserverlib.Event, roomVer
}
states = append(states, prevState)
}
// mix in the current room state
currState, err := t.lookupCurrentState(backwardsExtremity)
if err != nil {
util.GetLogger(t.context).WithError(err).Errorf("Failed to lookup current room state")
return err
}
states = append(states, currState)
resolvedState, err := t.resolveStatesAndCheck(roomVersion, states, backwardsExtremity)
if err != nil {
util.GetLogger(t.context).WithError(err).Errorf("Failed to resolve state conflicts for event %s", backwardsExtremity.EventID())
@ -526,23 +518,6 @@ func (t *txnReq) lookupStateAfterEventLocally(roomID, eventID string, needed []g
}
}
func (t *txnReq) lookupCurrentState(newEvent *gomatrixserverlib.Event) (*gomatrixserverlib.RespState, error) {
// Ask the roomserver for information about this room
queryReq := api.QueryLatestEventsAndStateRequest{
RoomID: newEvent.RoomID(),
StateToFetch: gomatrixserverlib.StateNeededForAuth([]gomatrixserverlib.Event{*newEvent}).Tuples(),
}
var queryRes api.QueryLatestEventsAndStateResponse
if err := t.rsAPI.QueryLatestEventsAndState(t.context, &queryReq, &queryRes); err != nil {
return nil, fmt.Errorf("lookupCurrentState rsAPI.QueryLatestEventsAndState: %w", err)
}
evs := gomatrixserverlib.UnwrapEventHeaders(queryRes.StateEvents)
return &gomatrixserverlib.RespState{
StateEvents: evs,
AuthEvents: evs,
}, nil
}
// lookuptStateBeforeEvent returns the room state before the event e, which is just /state_ids and/or /state depending on what
// the server supports.
func (t *txnReq) lookupStateBeforeEvent(roomVersion gomatrixserverlib.RoomVersion, roomID, eventID string) (