Reset transaction after a failure

syncapi/storage/interface.go

@@ -29,6 +29,7 @@ import (
 
 type DatabaseTransaction interface {
 	sqlutil.Transaction
+	Reset() (err error)
 	SharedUsers
 
 	MaxStreamPositionForPDUs(ctx context.Context) (types.StreamPosition, error)

syncapi/storage/shared/storage_consumer.go

@@ -77,6 +77,7 @@ func (d *Database) NewDatabaseSnapshot(ctx context.Context) (*DatabaseTransactio
 		}
 		return &DatabaseTransaction{
 			Database: d,
+			ctx:      ctx,
 			txn:      txn,
 		}, nil
 	*/
@@ -89,6 +90,7 @@ func (d *Database) NewDatabaseTransaction(ctx context.Context) (*DatabaseTransac
 	}
 	return &DatabaseTransaction{
 		Database: d,
+		ctx:      ctx,
 		txn:      txn,
 	}, nil
 }

syncapi/storage/shared/storage_sync.go

@@ -13,6 +13,7 @@ import (
 
 type DatabaseTransaction struct {
 	*Database
+	ctx context.Context
 	txn *sql.Tx
 }
 
@@ -30,6 +31,19 @@ func (d *DatabaseTransaction) Rollback() error {
 	return d.txn.Rollback()
 }
 
+func (d *DatabaseTransaction) Reset() (err error) {
+	if d.txn == nil {
+		return nil
+	}
+	if err = d.txn.Rollback(); err != nil {
+		return err
+	}
+	if d.txn, err = d.DB.BeginTx(d.ctx, nil); err != nil {
+		return err
+	}
+	return
+}
+
 func (d *DatabaseTransaction) MaxStreamPositionForPDUs(ctx context.Context) (types.StreamPosition, error) {
 	id, err := d.OutputEvents.SelectMaxEventID(ctx, d.txn)
 	if err != nil {

syncapi/streams/stream_accountdata.go

@@ -54,7 +54,7 @@ func (p *AccountDataStreamProvider) IncrementalSync(
 	)
 	if err != nil {
 		req.Log.WithError(err).Error("p.DB.GetAccountDataInRange failed")
-		_ = snapshot.Rollback()
+		_ = snapshot.Reset()
 		return from
 	}
 

syncapi/streams/stream_devicelist.go

@@ -34,13 +34,13 @@ func (p *DeviceListStreamProvider) IncrementalSync(
 	to, _, err = internal.DeviceListCatchup(context.Background(), snapshot, p.keyAPI, p.rsAPI, req.Device.UserID, req.Response, from, to)
 	if err != nil {
 		req.Log.WithError(err).Error("internal.DeviceListCatchup failed")
-		_ = snapshot.Rollback()
+		_ = snapshot.Reset()
 		return from
 	}
 	err = internal.DeviceOTKCounts(req.Context, p.keyAPI, req.Device.UserID, req.Device.ID, req.Response)
 	if err != nil {
 		req.Log.WithError(err).Error("internal.DeviceListCatchup failed")
-		_ = snapshot.Rollback()
+		_ = snapshot.Reset()
 		return from
 	}
 

syncapi/streams/stream_invite.go

@@ -56,7 +56,7 @@ func (p *InviteStreamProvider) IncrementalSync(
 	)
 	if err != nil {
 		req.Log.WithError(err).Error("p.DB.InviteEventsInRange failed")
-		_ = snapshot.Rollback()
+		_ = snapshot.Reset()
 		return from
 	}
 

syncapi/streams/stream_notificationdata.go

@@ -46,7 +46,7 @@ func (p *NotificationDataStreamProvider) IncrementalSync(
 	countsByRoom, err := snapshot.GetUserUnreadNotificationCountsForRooms(ctx, req.Device.UserID, req.Rooms)
 	if err != nil {
 		req.Log.WithError(err).Error("GetUserUnreadNotificationCountsForRooms failed")
-		_ = snapshot.Rollback()
+		_ = snapshot.Reset()
 		return from
 	}
 

syncapi/streams/stream_pdu.go

@@ -75,7 +75,7 @@ func (p *PDUStreamProvider) CompleteSync(
 	joinedRoomIDs, err := snapshot.RoomIDsWithMembership(ctx, req.Device.UserID, gomatrixserverlib.Join)
 	if err != nil {
 		req.Log.WithError(err).Error("p.DB.RoomIDsWithMembership failed")
-		_ = snapshot.Rollback()
+		_ = snapshot.Reset()
 		return from
 	}
 
@@ -102,7 +102,9 @@ func (p *PDUStreamProvider) CompleteSync(
 		)
 		if jerr != nil {
 			req.Log.WithError(jerr).Error("p.getJoinResponseForCompleteSync failed")
-			_ = snapshot.Rollback()
+			if err = snapshot.Reset(); err != nil {
+				return from
+			}
 			continue // return from
 		}
 		req.Response.Rooms.Join[roomID] = *jr
@@ -113,7 +115,7 @@ func (p *PDUStreamProvider) CompleteSync(
 	peeks, err := snapshot.PeeksInRange(ctx, req.Device.UserID, req.Device.ID, r)
 	if err != nil {
 		req.Log.WithError(err).Error("p.DB.PeeksInRange failed")
-		_ = snapshot.Rollback()
+		_ = snapshot.Reset()
 		return from
 	}
 	for _, peek := range peeks {
@@ -124,7 +126,9 @@ func (p *PDUStreamProvider) CompleteSync(
 			)
 			if err != nil {
 				req.Log.WithError(err).Error("p.getJoinResponseForCompleteSync failed")
-				_ = snapshot.Rollback()
+				if err = snapshot.Reset(); err != nil {
+					return from
+				}
 				continue // return from
 			}
 			req.Response.Rooms.Peek[peek.RoomID] = *jr
@@ -156,13 +160,13 @@ func (p *PDUStreamProvider) IncrementalSync(
 	if req.WantFullState {
 		if stateDeltas, syncJoinedRooms, err = snapshot.GetStateDeltasForFullStateSync(ctx, req.Device, r, req.Device.UserID, &stateFilter); err != nil {
 			req.Log.WithError(err).Error("p.DB.GetStateDeltasForFullStateSync failed")
-			_ = snapshot.Rollback()
+			_ = snapshot.Reset()
 			return
 		}
 	} else {
 		if stateDeltas, syncJoinedRooms, err = snapshot.GetStateDeltas(ctx, req.Device, r, req.Device.UserID, &stateFilter); err != nil {
 			req.Log.WithError(err).Error("p.DB.GetStateDeltas failed")
-			_ = snapshot.Rollback()
+			_ = snapshot.Reset()
 			return
 		}
 	}
@@ -177,7 +181,7 @@ func (p *PDUStreamProvider) IncrementalSync(
 
 	if err = p.addIgnoredUsersToFilter(ctx, snapshot, req, &eventFilter); err != nil {
 		req.Log.WithError(err).Error("unable to update event filter with ignored users")
-		_ = snapshot.Rollback()
+		_ = snapshot.Reset()
 	}
 
 	newPos = from
@@ -197,10 +201,12 @@ func (p *PDUStreamProvider) IncrementalSync(
 		var pos types.StreamPosition
 		if pos, err = p.addRoomDeltaToResponse(ctx, snapshot, req.Device, newRange, delta, &eventFilter, &stateFilter, req.Response); err != nil {
 			req.Log.WithError(err).Error("d.addRoomDeltaToResponse failed")
-			_ = snapshot.Rollback()
 			if err == context.DeadlineExceeded || err == context.Canceled {
 				return newPos
 			}
+			if err = snapshot.Reset(); err != nil {
+				return from
+			}
 			continue // return to
 		}
 		// Reset the position, as it is only for the special case of newly joined rooms
@@ -301,7 +307,7 @@ func (p *PDUStreamProvider) addRoomDeltaToResponse(
 	events, err := applyHistoryVisibilityFilter(ctx, snapshot, p.rsAPI, delta.RoomID, device.UserID, eventFilter.Limit, recentEvents)
 	if err != nil {
 		logrus.WithError(err).Error("unable to apply history visibility filter")
-		_ = snapshot.Rollback()
+		_ = snapshot.Reset()
 	}
 
 	if len(delta.StateEvents) > 0 {

syncapi/streams/stream_presence.go

@@ -67,7 +67,7 @@ func (p *PresenceStreamProvider) IncrementalSync(
 	presences, err := snapshot.PresenceAfter(ctx, from, gomatrixserverlib.EventFilter{Limit: 1000})
 	if err != nil {
 		req.Log.WithError(err).Error("p.DB.PresenceAfter failed")
-		_ = snapshot.Rollback()
+		_ = snapshot.Reset()
 		return from
 	}
 

syncapi/streams/stream_receipt.go

@@ -52,7 +52,7 @@ func (p *ReceiptStreamProvider) IncrementalSync(
 	lastPos, receipts, err := snapshot.RoomReceiptsAfter(ctx, joinedRooms, from)
 	if err != nil {
 		req.Log.WithError(err).Error("p.DB.RoomReceiptsAfter failed")
-		_ = snapshot.Rollback()
+		_ = snapshot.Reset()
 		return from
 	}
 

syncapi/streams/stream_sendtodevice.go

@@ -44,7 +44,7 @@ func (p *SendToDeviceStreamProvider) IncrementalSync(
 	lastPos, events, err := snapshot.SendToDeviceUpdatesForSync(req.Context, req.Device.UserID, req.Device.ID, from, to)
 	if err != nil {
 		req.Log.WithError(err).Error("p.DB.SendToDeviceUpdatesForSync failed")
-		_ = snapshot.Rollback()
+		_ = snapshot.Reset()
 		return from
 	}