Membership updater refactoring (#2541)

* Membership updater refactoring

* Pass in membership state

* Use membership check rather than referring to state directly

* Delete irrelevant membership states

* We don't need the leave event after all

* Tweaks

* Put a log entry in that I might stand a chance of finding

* Be less panicky

* Tweak invite handling

* Don't freak if we can't find the event NID

* Use event NID from `types.Event`

* Clean up

* Better invite handling

* Placate the almighty linter

* Blacklist a Sytest which is otherwise fine under Complement for reasons I don't understand

* Fix the sytest after all (thanks @S7evinK for the spot)

roomserver/internal/helpers/helpers.go

@@ -12,6 +12,7 @@ import (
 	"github.com/matrix-org/dendrite/roomserver/state"
 	"github.com/matrix-org/dendrite/roomserver/storage"
 	"github.com/matrix-org/dendrite/roomserver/storage/shared"
+	"github.com/matrix-org/dendrite/roomserver/storage/tables"
 	"github.com/matrix-org/dendrite/roomserver/types"
 	"github.com/matrix-org/gomatrixserverlib"
 	"github.com/matrix-org/util"
@@ -21,14 +22,14 @@ import (
 // Move these to a more sensible place.
 
 func UpdateToInviteMembership(
-	mu *shared.MembershipUpdater, add *gomatrixserverlib.Event, updates []api.OutputEvent,
+	mu *shared.MembershipUpdater, add *types.Event, updates []api.OutputEvent,
 	roomVersion gomatrixserverlib.RoomVersion,
 ) ([]api.OutputEvent, error) {
 	// We may have already sent the invite to the user, either because we are
 	// reprocessing this event, or because the we received this invite from a
 	// remote server via the federation invite API. In those cases we don't need
 	// to send the event.
-	needsSending, err := mu.SetToInvite(add)
+	needsSending, retired, err := mu.Update(tables.MembershipStateInvite, add)
 	if err != nil {
 		return nil, err
 	}
@@ -38,13 +39,23 @@ func UpdateToInviteMembership(
 		// room event stream. This ensures that the consumers only have to
 		// consider a single stream of events when determining whether a user
 		// is invited, rather than having to combine multiple streams themselves.
-		onie := api.OutputNewInviteEvent{
-			Event:       add.Headered(roomVersion),
-			RoomVersion: roomVersion,
-		}
 		updates = append(updates, api.OutputEvent{
-			Type:           api.OutputTypeNewInviteEvent,
-			NewInviteEvent: &onie,
+			Type: api.OutputTypeNewInviteEvent,
+			NewInviteEvent: &api.OutputNewInviteEvent{
+				Event:       add.Headered(roomVersion),
+				RoomVersion: roomVersion,
+			},
+		})
+	}
+	for _, eventID := range retired {
+		updates = append(updates, api.OutputEvent{
+			Type: api.OutputTypeRetireInviteEvent,
+			RetireInviteEvent: &api.OutputRetireInviteEvent{
+				EventID:          eventID,
+				Membership:       gomatrixserverlib.Join,
+				RetiredByEventID: add.EventID(),
+				TargetUserID:     *add.StateKey(),
+			},
 		})
 	}
 	return updates, nil