Clean up syncapi storage to match the coding style set by roomserver storage (#131)

src/github.com/matrix-org/dendrite/syncapi/storage/current_room_state_table.go

@@ -16,9 +16,6 @@ package storage
 
 import (
 	"database/sql"
-	"encoding/json"
-
-	"github.com/matrix-org/dendrite/clientapi/events"
 	"github.com/matrix-org/gomatrixserverlib"
 )
 
@@ -96,7 +93,7 @@ func (s *currentRoomStateStatements) prepare(db *sql.DB) (err error) {
 }
 
 // JoinedMemberLists returns a map of room ID to a list of joined user IDs.
-func (s *currentRoomStateStatements) JoinedMemberLists() (map[string][]string, error) {
+func (s *currentRoomStateStatements) selectJoinedUsers() (map[string][]string, error) {
 	rows, err := s.selectJoinedUsersStmt.Query()
 	if err != nil {
 		return nil, err
@@ -118,7 +115,7 @@ func (s *currentRoomStateStatements) JoinedMemberLists() (map[string][]string, e
 }
 
 // SelectRoomIDsWithMembership returns the list of room IDs which have the given user in the given membership state.
-func (s *currentRoomStateStatements) SelectRoomIDsWithMembership(txn *sql.Tx, userID, membership string) ([]string, error) {
+func (s *currentRoomStateStatements) selectRoomIDsWithMembership(txn *sql.Tx, userID, membership string) ([]string, error) {
 	rows, err := txn.Stmt(s.selectRoomIDsWithMembershipStmt).Query(userID, membership)
 	if err != nil {
 		return nil, err
@@ -137,7 +134,7 @@ func (s *currentRoomStateStatements) SelectRoomIDsWithMembership(txn *sql.Tx, us
 }
 
 // CurrentState returns all the current state events for the given room.
-func (s *currentRoomStateStatements) CurrentState(txn *sql.Tx, roomID string) ([]gomatrixserverlib.Event, error) {
+func (s *currentRoomStateStatements) selectCurrentState(txn *sql.Tx, roomID string) ([]gomatrixserverlib.Event, error) {
 	rows, err := txn.Stmt(s.selectCurrentStateStmt).Query(roomID)
 	if err != nil {
 		return nil, err
@@ -160,34 +157,14 @@ func (s *currentRoomStateStatements) CurrentState(txn *sql.Tx, roomID string) ([
 	return result, nil
 }
 
-func (s *currentRoomStateStatements) UpdateRoomState(txn *sql.Tx, added []gomatrixserverlib.Event, removedEventIDs []string) error {
+func (s *currentRoomStateStatements) deleteRoomStateByEventID(txn *sql.Tx, eventID string) error {
-	// remove first, then add, as we do not ever delete state, but do replace state which is a remove followed by an add.
-	for _, eventID := range removedEventIDs {
 	_, err := txn.Stmt(s.deleteRoomStateByEventIDStmt).Exec(eventID)
-		if err != nil {
 	return err
-		}
+}
-	}
 
-	for _, event := range added {
+func (s *currentRoomStateStatements) upsertRoomState(txn *sql.Tx, event gomatrixserverlib.Event, membership *string) error {
-		if event.StateKey() == nil {
-			// ignore non state events
-			continue
-		}
-		var membership *string
-		if event.Type() == "m.room.member" {
-			var memberContent events.MemberContent
-			if err := json.Unmarshal(event.Content(), &memberContent); err != nil {
-				return err
-			}
-			membership = &memberContent.Membership
-		}
 	_, err := txn.Stmt(s.upsertRoomStateStmt).Exec(
 		event.RoomID(), event.EventID(), event.Type(), *event.StateKey(), event.JSON(), membership,
 	)
-		if err != nil {
 	return err
-		}
-	}
-	return nil
 }

src/github.com/matrix-org/dendrite/syncapi/storage/output_room_events_table.go

@@ -95,13 +95,15 @@ func (s *outputRoomEventsStatements) prepare(db *sql.DB) (err error) {
 	return
 }
 
-// StateBetween returns the state events between the two given stream positions, exclusive of oldPos, inclusive of newPos.
+// selectStateInRange returns the state events between the two given stream positions, exclusive of oldPos, inclusive of newPos.
 // Results are bucketed based on the room ID. If the same state is overwritten multiple times between the
 // two positions, only the most recent state is returned.
-func (s *outputRoomEventsStatements) StateBetween(txn *sql.Tx, oldPos, newPos types.StreamPosition) (map[string][]streamEvent, error) {
+func (s *outputRoomEventsStatements) selectStateInRange(
+	txn *sql.Tx, oldPos, newPos types.StreamPosition,
+) (map[string]map[string]bool, map[string]streamEvent, error) {
 	rows, err := txn.Stmt(s.selectStateInRangeStmt).Query(oldPos, newPos)
 	if err != nil {
-		return nil, err
+		return nil, nil, err
 	}
 	// Fetch all the state change events for all rooms between the two positions then loop each event and:
 	//  - Keep a cache of the event by ID (99% of state change events are for the event itself)
@@ -121,7 +123,7 @@ func (s *outputRoomEventsStatements) StateBetween(txn *sql.Tx, oldPos, newPos ty
 			delIDs     pq.StringArray
 		)
 		if err := rows.Scan(&streamPos, &eventBytes, &addIDs, &delIDs); err != nil {
-			return nil, err
+			return nil, nil, err
 		}
 		// Sanity check for deleted state and whine if we see it. We don't need to do anything
 		// since it'll just mark the event as not being needed.
@@ -137,7 +139,7 @@ func (s *outputRoomEventsStatements) StateBetween(txn *sql.Tx, oldPos, newPos ty
 		// TODO: Handle redacted events
 		ev, err := gomatrixserverlib.NewEventFromTrustedJSON(eventBytes, false)
 		if err != nil {
-			return nil, err
+			return nil, nil, err
 		}
 		needSet := stateNeeded[ev.RoomID()]
 		if needSet == nil { // make set if required
@@ -154,56 +156,13 @@ func (s *outputRoomEventsStatements) StateBetween(txn *sql.Tx, oldPos, newPos ty
 		eventIDToEvent[ev.EventID()] = streamEvent{ev, types.StreamPosition(streamPos)}
 	}
 
-	return s.fetchStateEvents(txn, stateNeeded, eventIDToEvent)
+	return stateNeeded, eventIDToEvent, nil
-}
-
-// fetchStateEvents converts the set of event IDs into a set of events. It will fetch any which are missing from the database.
-// Returns a map of room ID to list of events.
-func (s *outputRoomEventsStatements) fetchStateEvents(txn *sql.Tx, roomIDToEventIDSet map[string]map[string]bool, eventIDToEvent map[string]streamEvent) (map[string][]streamEvent, error) {
-	stateBetween := make(map[string][]streamEvent)
-	missingEvents := make(map[string][]string)
-	for roomID, ids := range roomIDToEventIDSet {
-		events := stateBetween[roomID]
-		for id, need := range ids {
-			if !need {
-				continue // deleted state
-			}
-			e, ok := eventIDToEvent[id]
-			if ok {
-				events = append(events, e)
-			} else {
-				m := missingEvents[roomID]
-				m = append(m, id)
-				missingEvents[roomID] = m
-			}
-		}
-		stateBetween[roomID] = events
-	}
-
-	if len(missingEvents) > 0 {
-		// This happens when add_state_ids has an event ID which is not in the provided range.
-		// We need to explicitly fetch them.
-		allMissingEventIDs := []string{}
-		for _, missingEvIDs := range missingEvents {
-			allMissingEventIDs = append(allMissingEventIDs, missingEvIDs...)
-		}
-		evs, err := s.Events(txn, allMissingEventIDs)
-		if err != nil {
-			return nil, err
-		}
-		// we know we got them all otherwise an error would've been returned, so just loop the events
-		for _, ev := range evs {
-			roomID := ev.RoomID()
-			stateBetween[roomID] = append(stateBetween[roomID], ev)
-		}
-	}
-	return stateBetween, nil
 }
 
 // MaxID returns the ID of the last inserted event in this table. 'txn' is optional. If it is not supplied,
 // then this function should only ever be used at startup, as it will race with inserting events if it is
 // done afterwards. If there are no inserted events, 0 is returned.
-func (s *outputRoomEventsStatements) MaxID(txn *sql.Tx) (id int64, err error) {
+func (s *outputRoomEventsStatements) selectMaxID(txn *sql.Tx) (id int64, err error) {
 	stmt := s.selectMaxIDStmt
 	if txn != nil {
 		stmt = txn.Stmt(stmt)
@@ -218,7 +177,7 @@ func (s *outputRoomEventsStatements) MaxID(txn *sql.Tx) (id int64, err error) {
 
 // InsertEvent into the output_room_events table. addState and removeState are an optional list of state event IDs. Returns the position
 // of the inserted event.
-func (s *outputRoomEventsStatements) InsertEvent(txn *sql.Tx, event *gomatrixserverlib.Event, addState, removeState []string) (streamPos int64, err error) {
+func (s *outputRoomEventsStatements) insertEvent(txn *sql.Tx, event *gomatrixserverlib.Event, addState, removeState []string) (streamPos int64, err error) {
 	err = txn.Stmt(s.insertEventStmt).QueryRow(
 		event.RoomID(), event.EventID(), event.JSON(), pq.StringArray(addState), pq.StringArray(removeState),
 	).Scan(&streamPos)
@@ -226,7 +185,9 @@ func (s *outputRoomEventsStatements) InsertEvent(txn *sql.Tx, event *gomatrixser
 }
 
 // RecentEventsInRoom returns the most recent events in the given room, up to a maximum of 'limit'.
-func (s *outputRoomEventsStatements) RecentEventsInRoom(txn *sql.Tx, roomID string, fromPos, toPos types.StreamPosition, limit int) ([]streamEvent, error) {
+func (s *outputRoomEventsStatements) selectRecentEvents(
+	txn *sql.Tx, roomID string, fromPos, toPos types.StreamPosition, limit int,
+) ([]streamEvent, error) {
 	rows, err := s.selectRecentEventsStmt.Query(roomID, fromPos, toPos, limit)
 	if err != nil {
 		return nil, err
@@ -243,7 +204,7 @@ func (s *outputRoomEventsStatements) RecentEventsInRoom(txn *sql.Tx, roomID stri
 
 // Events returns the events for the given event IDs. Returns an error if any one of the event IDs given are missing
 // from the database.
-func (s *outputRoomEventsStatements) Events(txn *sql.Tx, eventIDs []string) ([]streamEvent, error) {
+func (s *outputRoomEventsStatements) selectEvents(txn *sql.Tx, eventIDs []string) ([]streamEvent, error) {
 	rows, err := txn.Stmt(s.selectEventsStmt).Query(pq.StringArray(eventIDs))
 	if err != nil {
 		return nil, err

src/github.com/matrix-org/dendrite/syncapi/storage/syncserver.go

@@ -72,7 +72,7 @@ func NewSyncServerDatabase(dataSourceName string) (*SyncServerDatabase, error) {
 
 // AllJoinedUsersInRooms returns a map of room ID to a list of all joined user IDs.
 func (d *SyncServerDatabase) AllJoinedUsersInRooms() (map[string][]string, error) {
-	return d.roomstate.JoinedMemberLists()
+	return d.roomstate.selectJoinedUsers()
 }
 
 // WriteEvent into the database. It is not safe to call this function from multiple goroutines, as it would create races
@@ -81,7 +81,7 @@ func (d *SyncServerDatabase) AllJoinedUsersInRooms() (map[string][]string, error
 func (d *SyncServerDatabase) WriteEvent(ev *gomatrixserverlib.Event, addStateEventIDs, removeStateEventIDs []string) (streamPos types.StreamPosition, returnErr error) {
 	returnErr = runTransaction(d.db, func(txn *sql.Tx) error {
 		var err error
-		pos, err := d.events.InsertEvent(txn, ev, addStateEventIDs, removeStateEventIDs)
+		pos, err := d.events.insertEvent(txn, ev, addStateEventIDs, removeStateEventIDs)
 		if err != nil {
 			return err
 		}
@@ -97,22 +97,49 @@ func (d *SyncServerDatabase) WriteEvent(ev *gomatrixserverlib.Event, addStateEve
 		// However, conflict resolution may result in there being different events being added, or even some removed.
 		if len(removeStateEventIDs) == 0 && len(addStateEventIDs) == 1 && addStateEventIDs[0] == ev.EventID() {
 			// common case
-			if err = d.roomstate.UpdateRoomState(txn, []gomatrixserverlib.Event{*ev}, nil); err != nil {
+			return d.updateRoomState(txn, nil, []gomatrixserverlib.Event{*ev})
-				return err
-			}
-			return nil
 		}
 
 		// uncommon case: we need to fetch the full event for each event ID mentioned, then update room state
-		added, err := d.events.Events(txn, addStateEventIDs)
+		added, err := d.events.selectEvents(txn, addStateEventIDs)
 		if err != nil {
 			return err
 		}
-		return d.roomstate.UpdateRoomState(txn, streamEventsToEvents(added), removeStateEventIDs)
+
+		return d.updateRoomState(txn, removeStateEventIDs, streamEventsToEvents(added))
 	})
 	return
 }
 
+func (d *SyncServerDatabase) updateRoomState(txn *sql.Tx, removedEventIDs []string, addedEvents []gomatrixserverlib.Event) error {
+	// remove first, then add, as we do not ever delete state, but do replace state which is a remove followed by an add.
+	for _, eventID := range removedEventIDs {
+		if err := d.roomstate.deleteRoomStateByEventID(txn, eventID); err != nil {
+			return err
+		}
+	}
+
+	for _, event := range addedEvents {
+		if event.StateKey() == nil {
+			// ignore non state events
+			continue
+		}
+		var membership *string
+		if event.Type() == "m.room.member" {
+			var memberContent events.MemberContent
+			if err := json.Unmarshal(event.Content(), &memberContent); err != nil {
+				return err
+			}
+			membership = &memberContent.Membership
+		}
+		if err := d.roomstate.upsertRoomState(txn, event, membership); err != nil {
+			return err
+		}
+	}
+
+	return nil
+}
+
 // PartitionOffsets implements common.PartitionStorer
 func (d *SyncServerDatabase) PartitionOffsets(topic string) ([]common.PartitionOffset, error) {
 	return d.partitions.SelectPartitionOffsets(topic)
@@ -125,7 +152,7 @@ func (d *SyncServerDatabase) SetPartitionOffset(topic string, partition int32, o
 
 // SyncStreamPosition returns the latest position in the sync stream. Returns 0 if there are no events yet.
 func (d *SyncServerDatabase) SyncStreamPosition() (types.StreamPosition, error) {
-	id, err := d.events.MaxID(nil)
+	id, err := d.events.selectMaxID(nil)
 	if err != nil {
 		return types.StreamPosition(0), err
 	}
@@ -156,7 +183,7 @@ func (d *SyncServerDatabase) IncrementalSync(userID string, fromPos, toPos types
 				// This is all "okay" assuming history_visibility == "shared" which it is by default.
 				endPos = delta.membershipPos
 			}
-			recentStreamEvents, err := d.events.RecentEventsInRoom(txn, delta.roomID, fromPos, endPos, numRecentEventsPerRoom)
+			recentStreamEvents, err := d.events.selectRecentEvents(txn, delta.roomID, fromPos, endPos, numRecentEventsPerRoom)
 			if err != nil {
 				return err
 			}
@@ -197,14 +224,14 @@ func (d *SyncServerDatabase) CompleteSync(userID string, numRecentEventsPerRoom
 	// but it's better to not hide the fact that this is being done in a transaction.
 	returnErr = runTransaction(d.db, func(txn *sql.Tx) error {
 		// Get the current stream position which we will base the sync response on.
-		id, err := d.events.MaxID(txn)
+		id, err := d.events.selectMaxID(txn)
 		if err != nil {
 			return err
 		}
 		pos := types.StreamPosition(id)
 
 		// Extract room state and recent events for all rooms the user is joined to.
-		roomIDs, err := d.roomstate.SelectRoomIDsWithMembership(txn, userID, "join")
+		roomIDs, err := d.roomstate.selectRoomIDsWithMembership(txn, userID, "join")
 		if err != nil {
 			return err
 		}
@@ -212,13 +239,15 @@ func (d *SyncServerDatabase) CompleteSync(userID string, numRecentEventsPerRoom
 		// Build up a /sync response. Add joined rooms.
 		res = types.NewResponse(pos)
 		for _, roomID := range roomIDs {
-			stateEvents, err := d.roomstate.CurrentState(txn, roomID)
+			stateEvents, err := d.roomstate.selectCurrentState(txn, roomID)
 			if err != nil {
 				return err
 			}
 			// TODO: When filters are added, we may need to call this multiple times to get enough events.
 			//       See: https://github.com/matrix-org/synapse/blob/v0.19.3/synapse/handlers/sync.py#L316
-			recentStreamEvents, err := d.events.RecentEventsInRoom(txn, roomID, types.StreamPosition(0), pos, numRecentEventsPerRoom)
+			recentStreamEvents, err := d.events.selectRecentEvents(
+				txn, roomID, types.StreamPosition(0), pos, numRecentEventsPerRoom,
+			)
 			if err != nil {
 				return err
 			}
@@ -239,7 +268,7 @@ func (d *SyncServerDatabase) CompleteSync(userID string, numRecentEventsPerRoom
 
 func (d *SyncServerDatabase) addInvitesToResponse(txn *sql.Tx, userID string, res *types.Response) error {
 	// Add invites - TODO: This will break over federation as they won't be in the current state table according to Mark.
-	roomIDs, err := d.roomstate.SelectRoomIDsWithMembership(txn, userID, "invite")
+	roomIDs, err := d.roomstate.selectRoomIDsWithMembership(txn, userID, "invite")
 	if err != nil {
 		return err
 	}
@@ -251,6 +280,49 @@ func (d *SyncServerDatabase) addInvitesToResponse(txn *sql.Tx, userID string, re
 	return nil
 }
 
+// fetchStateEvents converts the set of event IDs into a set of events. It will fetch any which are missing from the database.
+// Returns a map of room ID to list of events.
+func (d *SyncServerDatabase) fetchStateEvents(txn *sql.Tx, roomIDToEventIDSet map[string]map[string]bool, eventIDToEvent map[string]streamEvent) (map[string][]streamEvent, error) {
+	stateBetween := make(map[string][]streamEvent)
+	missingEvents := make(map[string][]string)
+	for roomID, ids := range roomIDToEventIDSet {
+		events := stateBetween[roomID]
+		for id, need := range ids {
+			if !need {
+				continue // deleted state
+			}
+			e, ok := eventIDToEvent[id]
+			if ok {
+				events = append(events, e)
+			} else {
+				m := missingEvents[roomID]
+				m = append(m, id)
+				missingEvents[roomID] = m
+			}
+		}
+		stateBetween[roomID] = events
+	}
+
+	if len(missingEvents) > 0 {
+		// This happens when add_state_ids has an event ID which is not in the provided range.
+		// We need to explicitly fetch them.
+		allMissingEventIDs := []string{}
+		for _, missingEvIDs := range missingEvents {
+			allMissingEventIDs = append(allMissingEventIDs, missingEvIDs...)
+		}
+		evs, err := d.events.selectEvents(txn, allMissingEventIDs)
+		if err != nil {
+			return nil, err
+		}
+		// we know we got them all otherwise an error would've been returned, so just loop the events
+		for _, ev := range evs {
+			roomID := ev.RoomID()
+			stateBetween[roomID] = append(stateBetween[roomID], ev)
+		}
+	}
+	return stateBetween, nil
+}
+
 func (d *SyncServerDatabase) getStateDeltas(txn *sql.Tx, fromPos, toPos types.StreamPosition, userID string) ([]stateDelta, error) {
 	// Implement membership change algorithm: https://github.com/matrix-org/synapse/blob/v0.19.3/synapse/handlers/sync.py#L821
 	// - Get membership list changes for this user in this sync response
@@ -263,10 +335,15 @@ func (d *SyncServerDatabase) getStateDeltas(txn *sql.Tx, fromPos, toPos types.St
 	var deltas []stateDelta
 
 	// get all the state events ever between these two positions
-	state, err := d.events.StateBetween(txn, fromPos, toPos)
+	stateNeeded, eventMap, err := d.events.selectStateInRange(txn, fromPos, toPos)
 	if err != nil {
 		return nil, err
 	}
+	state, err := d.fetchStateEvents(txn, stateNeeded, eventMap)
+	if err != nil {
+		return nil, err
+	}
+
 	for roomID, stateStreamEvents := range state {
 		for _, ev := range stateStreamEvents {
 			// TODO: Currently this will incorrectly add rooms which were ALREADY joined but they sent another no-op join event.
@@ -278,7 +355,7 @@ func (d *SyncServerDatabase) getStateDeltas(txn *sql.Tx, fromPos, toPos types.St
 				if membership == "join" {
 					// send full room state down instead of a delta
 					var allState []gomatrixserverlib.Event
-					allState, err = d.roomstate.CurrentState(txn, roomID)
+					allState, err = d.roomstate.selectCurrentState(txn, roomID)
 					if err != nil {
 						return nil, err
 					}
@@ -302,7 +379,7 @@ func (d *SyncServerDatabase) getStateDeltas(txn *sql.Tx, fromPos, toPos types.St
 	}
 
 	// Add in currently joined rooms
-	joinedRoomIDs, err := d.roomstate.SelectRoomIDsWithMembership(txn, userID, "join")
+	joinedRoomIDs, err := d.roomstate.selectRoomIDsWithMembership(txn, userID, "join")
 	if err != nil {
 		return nil, err
 	}