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Fetch events by ID rather than use current state as this includes auth events (#1009)

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Kegsay 2020-05-05 16:46:22 +01:00 committed by GitHub
parent a06511cae8
commit 1db5dfe4d0
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GPG Key ID: 4AEE18F83AFDEB23
1 changed files with 19 additions and 19 deletions
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38
federationapi/routing/send.go
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@ -354,29 +354,29 @@ func (t *txnReq) lookupMissingStateViaState(e gomatrixserverlib.Event, roomVersi
func (t *txnReq) lookupMissingStateViaStateIDs(e gomatrixserverlib.Event, roomVersion gomatrixserverlib.RoomVersion) (
*gomatrixserverlib.RespState, error) {
// fetch all the state events we do know about: the current state
queryReq := api.QueryLatestEventsAndStateRequest{
RoomID: e.RoomID(),
StateToFetch: nil, // fetch all state
}
var queryRes api.QueryLatestEventsAndStateResponse
if err := t.rsAPI.QueryLatestEventsAndState(t.context, &queryReq, &queryRes); err != nil {
return nil, err
}
if !queryRes.RoomExists {
return nil, fmt.Errorf("room %s doesn't exist", e.RoomID())
}
// allow indexing of current state by event ID
haveEventMap := make(map[string]*gomatrixserverlib.HeaderedEvent, len(queryRes.StateEvents))
for i := range queryRes.StateEvents {
haveEventMap[queryRes.StateEvents[i].EventID()] = &queryRes.StateEvents[i]
}
// fetch the state event IDs at the time of the event
stateIDs, err := t.federation.LookupStateIDs(t.context, t.Origin, e.RoomID(), e.EventID())
if err != nil {
return nil, err
}
// fetch as many as we can from the roomserver, do them as 2 calls rather than
// 1 to try to reduce the number of parameters in the bulk query this will use
haveEventMap := make(map[string]*gomatrixserverlib.HeaderedEvent, len(stateIDs.StateEventIDs))
for _, eventList := range [][]string{stateIDs.StateEventIDs, stateIDs.AuthEventIDs} {
queryReq := api.QueryEventsByIDRequest{
EventIDs: eventList,
}
var queryRes api.QueryEventsByIDResponse
if err := t.rsAPI.QueryEventsByID(t.context, &queryReq, &queryRes); err != nil {
return nil, err
}
// allow indexing of current state by event ID
for i := range queryRes.Events {
haveEventMap[queryRes.Events[i].EventID()] = &queryRes.Events[i]
}
}
// work out which auth/state IDs are missing
wantIDs := append(stateIDs.StateEventIDs, stateIDs.AuthEventIDs...)
missing := make(map[string]bool)
@ -389,7 +389,7 @@ func (t *txnReq) lookupMissingStateViaStateIDs(e gomatrixserverlib.Event, roomVe
"missing": len(missing),
"event_id": e.EventID(),
"room_id": e.RoomID(),
"already_have": len(queryRes.StateEvents),
"already_have": len(haveEventMap),
"total_state": len(stateIDs.StateEventIDs),
"total_auth_events": len(stateIDs.AuthEventIDs),
}).Info("Fetching missing state at event")