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Tweak LoadMembershipAtEvent behaviour when state not known (#2716)

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Previously `LoadMembershipAtEvent` would fail if the state before one of
the events was not known, i.e. because it was an outlier. This modifies
it so that it gracefully handles not knowing the state and returns no
memberships instead, so that history visibility doesn't freak out and
kill `/sync` requests dead.
This commit is contained in:
Neil Alexander 2022-09-13 12:52:09 +01:00 • committed by GitHub
parent 3e55856254
commit b05e028f7d
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GPG key ID: 4AEE18F83AFDEB23
4 changed files with 18 additions and 7 deletions
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9
roomserver/internal/query/query.go
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@ -208,6 +208,9 @@ func (r *Queryer) QueryMembershipForUser(
return err
}
// QueryMembershipAtEvent returns the known memberships at a given event.
// If the state before an event is not known, an empty list will be returned
// for that event instead.
func (r *Queryer) QueryMembershipAtEvent(
ctx context.Context,
request *api.QueryMembershipAtEventRequest,
@ -237,7 +240,11 @@ func (r *Queryer) QueryMembershipAtEvent(
}
for _, eventID := range request.EventIDs {
stateEntry := stateEntries[eventID]
stateEntry, ok := stateEntries[eventID]
if !ok {
response.Memberships[eventID] = []*gomatrixserverlib.HeaderedEvent{}
continue
}
memberships, err := helpers.GetMembershipsAtState(ctx, r.DB, stateEntry, false)
if err != nil {
return fmt.Errorf("unable to get memberships at state: %w", err)