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Don't try to re-fetch the event if it is listed in adds_state_event_ids
(#2437)
* Don't try to re-fetch the event in the output message * Try that again * Add the initial event into the set
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parent
f69ebc6af2
commit
1a7f4c8aa9
@ -154,41 +154,76 @@ func (s *OutputRoomEventConsumer) onNewRoomEvent(
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ctx context.Context, msg api.OutputNewRoomEvent,
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) error {
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ev := msg.Event
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addsStateEvents := []*gomatrixserverlib.HeaderedEvent{}
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foundEventIDs := map[string]bool{}
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if len(msg.AddsStateEventIDs) > 0 {
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// Work out the list of events we need to find out about. Either
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// they will be the event supplied in the request, we will find it
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// in the sync API database or we'll need to ask the roomserver.
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knownEventIDs := make(map[string]bool, len(msg.AddsStateEventIDs))
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for _, eventID := range msg.AddsStateEventIDs {
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foundEventIDs[eventID] = false
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if eventID == ev.EventID() {
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knownEventIDs[eventID] = true
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addsStateEvents = append(addsStateEvents, ev)
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} else {
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knownEventIDs[eventID] = false
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}
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foundEvents, err := s.db.Events(ctx, msg.AddsStateEventIDs)
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}
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// Work out which events we want to look up in the sync API database.
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// At this stage the only event that should be excluded is the event
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// supplied in the request, if it appears in the adds_state_event_ids.
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missingEventIDs := make([]string, 0, len(msg.AddsStateEventIDs))
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for eventID, known := range knownEventIDs {
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if !known {
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missingEventIDs = append(missingEventIDs, eventID)
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}
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}
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// Look the events up in the database. If we know them, add them into
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// the set of adds state events.
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if len(missingEventIDs) > 0 {
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alreadyKnown, err := s.db.Events(ctx, msg.AddsStateEventIDs)
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if err != nil {
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return fmt.Errorf("s.db.Events: %w", err)
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}
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for _, event := range foundEvents {
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foundEventIDs[event.EventID()] = true
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for _, knownEvent := range alreadyKnown {
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knownEventIDs[knownEvent.EventID()] = true
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addsStateEvents = append(addsStateEvents, knownEvent)
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}
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}
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// Now work out if there are any remaining events we don't know. For
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// these we will need to ask the roomserver for help.
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missingEventIDs = missingEventIDs[:0]
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for eventID, known := range knownEventIDs {
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if !known {
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missingEventIDs = append(missingEventIDs, eventID)
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}
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}
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// Ask the roomserver and add in the rest of the results into the set.
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// Finally, work out if there are any more events missing.
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if len(missingEventIDs) > 0 {
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eventsReq := &api.QueryEventsByIDRequest{
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EventIDs: missingEventIDs,
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}
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eventsReq := &api.QueryEventsByIDRequest{}
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eventsRes := &api.QueryEventsByIDResponse{}
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for eventID, found := range foundEventIDs {
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if !found {
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eventsReq.EventIDs = append(eventsReq.EventIDs, eventID)
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}
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}
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if err = s.rsAPI.QueryEventsByID(ctx, eventsReq, eventsRes); err != nil {
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if err := s.rsAPI.QueryEventsByID(ctx, eventsReq, eventsRes); err != nil {
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return fmt.Errorf("s.rsAPI.QueryEventsByID: %w", err)
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}
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for _, event := range eventsRes.Events {
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eventID := event.EventID()
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foundEvents = append(foundEvents, event)
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foundEventIDs[eventID] = true
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addsStateEvents = append(addsStateEvents, event)
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knownEventIDs[event.EventID()] = true
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}
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for eventID, found := range foundEventIDs {
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// This should never happen because this would imply that the
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// roomserver has sent us adds_state_event_ids for events that it
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// also doesn't know about, but let's just be sure.
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for eventID, found := range knownEventIDs {
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if !found {
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return fmt.Errorf("event %s is missing", eventID)
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}
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}
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addsStateEvents = foundEvents
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}
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ev, err := s.updateStateEvent(ev)
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