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Don't include current state in processEventWithMissingState (#1126)
* Don't include current state in processEventWithMissingState * Remove lookupCurrentState as not needed Co-authored-by: Kegsay <kegan@matrix.org>
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@ -404,8 +404,7 @@ func (t *txnReq) processEventWithMissingState(e gomatrixserverlib.Event, roomVer
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// 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.
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// security: we have to do state resolution on the new backwards extremity (TODO: WHY)
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// Therefore, we cannot just query /state_ids with this event to get the state before. Instead, we need to query
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// the state AFTER all the prev_events for this event, then mix in our current room state and apply state resolution
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// to that to get the state before the event.
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// the state AFTER all the prev_events for this event, then apply state resolution to that to get the state before the event.
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var states []*gomatrixserverlib.RespState
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needed := gomatrixserverlib.StateNeededForAuth([]gomatrixserverlib.Event{*backwardsExtremity}).Tuples()
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for _, prevEventID := range backwardsExtremity.PrevEventIDs() {
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@ -417,13 +416,6 @@ func (t *txnReq) processEventWithMissingState(e gomatrixserverlib.Event, roomVer
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}
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states = append(states, prevState)
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}
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// mix in the current room state
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currState, err := t.lookupCurrentState(backwardsExtremity)
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if err != nil {
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util.GetLogger(t.context).WithError(err).Errorf("Failed to lookup current room state")
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return err
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}
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states = append(states, currState)
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resolvedState, err := t.resolveStatesAndCheck(roomVersion, states, backwardsExtremity)
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if err != nil {
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util.GetLogger(t.context).WithError(err).Errorf("Failed to resolve state conflicts for event %s", backwardsExtremity.EventID())
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@ -526,23 +518,6 @@ func (t *txnReq) lookupStateAfterEventLocally(roomID, eventID string, needed []g
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}
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}
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func (t *txnReq) lookupCurrentState(newEvent *gomatrixserverlib.Event) (*gomatrixserverlib.RespState, error) {
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// Ask the roomserver for information about this room
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queryReq := api.QueryLatestEventsAndStateRequest{
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RoomID: newEvent.RoomID(),
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StateToFetch: gomatrixserverlib.StateNeededForAuth([]gomatrixserverlib.Event{*newEvent}).Tuples(),
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}
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var queryRes api.QueryLatestEventsAndStateResponse
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if err := t.rsAPI.QueryLatestEventsAndState(t.context, &queryReq, &queryRes); err != nil {
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return nil, fmt.Errorf("lookupCurrentState rsAPI.QueryLatestEventsAndState: %w", err)
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}
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evs := gomatrixserverlib.UnwrapEventHeaders(queryRes.StateEvents)
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return &gomatrixserverlib.RespState{
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StateEvents: evs,
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AuthEvents: evs,
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}, nil
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}
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// lookuptStateBeforeEvent returns the room state before the event e, which is just /state_ids and/or /state depending on what
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// the server supports.
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func (t *txnReq) lookupStateBeforeEvent(roomVersion gomatrixserverlib.RoomVersion, roomID, eventID string) (
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