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Fix a panic in OnIncomingMessagesRequest (#2250)

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It's possible for `GetStateEvent` to return `nil` if there was no error but the state event wasn't found. Therefore we need to be prepared for that case.

This should fix #2247.
This commit is contained in:
Neil Alexander 2022-03-04 10:24:26 +00:00 committed by GitHub
parent f75169c353
commit 7fc62d8178
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1 changed files with 6 additions and 4 deletions
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10
syncapi/routing/messages.go
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@ -184,16 +184,18 @@ func OnIncomingMessagesRequest(
// at least fetch the membership events for the users returned in chunk if LazyLoadMembers is set
state := []gomatrixserverlib.ClientEvent{}
if filter.LazyLoadMembers {
memberShipToUser := make(map[string]*gomatrixserverlib.HeaderedEvent)
membershipToUser := make(map[string]*gomatrixserverlib.HeaderedEvent)
for _, evt := range clientEvents {
memberShip, err := db.GetStateEvent(req.Context(), roomID, gomatrixserverlib.MRoomMember, evt.Sender)
membership, err := db.GetStateEvent(req.Context(), roomID, gomatrixserverlib.MRoomMember, evt.Sender)
if err != nil {
util.GetLogger(req.Context()).WithError(err).Error("failed to get membership event for user")
continue
}
memberShipToUser[evt.Sender] = memberShip
if membership != nil {
membershipToUser[evt.Sender] = membership
}
}
for _, evt := range memberShipToUser {
for _, evt := range membershipToUser {
state = append(state, gomatrixserverlib.HeaderedToClientEvent(evt, gomatrixserverlib.FormatAll))
}
}