Initial work on simplified state storage

go.mod

@@ -25,7 +25,7 @@ require (
 	github.com/matrix-org/gomatrixserverlib v0.0.0-20210302161955-6142fe3f8c2c
 	github.com/matrix-org/naffka v0.0.0-20201009174903-d26a3b9cb161
 	github.com/matrix-org/util v0.0.0-20200807132607-55161520e1d4
-	github.com/mattn/go-sqlite3 v1.14.6
+	github.com/mattn/go-sqlite3 v1.14.7-0.20210414154423-1157a4212dcb
 	github.com/nfnt/resize v0.0.0-20180221191011-83c6a9932646
 	github.com/ngrok/sqlmw v0.0.0-20200129213757-d5c93a81bec6
 	github.com/opentracing/opentracing-go v1.2.0

go.sum

@@ -684,8 +684,8 @@ github.com/mattn/go-isatty v0.0.10/go.mod h1:qgIWMr58cqv1PHHyhnkY9lrL7etaEgOFcME
 github.com/mattn/go-runewidth v0.0.2/go.mod h1:LwmH8dsx7+W8Uxz3IHJYH5QSwggIsqBzpuz5H//U1FU=
 github.com/mattn/go-runewidth v0.0.7/go.mod h1:H031xJmbD/WCDINGzjvQ9THkh0rPKHF+m2gUSrubnMI=
 github.com/mattn/go-sqlite3 v1.14.2/go.mod h1:JIl7NbARA7phWnGvh0LKTyg7S9BA+6gx71ShQilpsus=
-github.com/mattn/go-sqlite3 v1.14.6 h1:dNPt6NO46WmLVt2DLNpwczCmdV5boIZ6g/tlDrlRUbg=
+github.com/mattn/go-sqlite3 v1.14.7-0.20210414154423-1157a4212dcb h1:ax2vG2unlxsjwS7PMRo4FECIfAdQLowd6ejWYwPQhBo=
-github.com/mattn/go-sqlite3 v1.14.6/go.mod h1:NyWgC/yNuGj7Q9rpYnZvas74GogHl5/Z4A/KQRfk6bU=
+github.com/mattn/go-sqlite3 v1.14.7-0.20210414154423-1157a4212dcb/go.mod h1:NyWgC/yNuGj7Q9rpYnZvas74GogHl5/Z4A/KQRfk6bU=
 github.com/mattn/goveralls v0.0.2/go.mod h1:8d1ZMHsd7fW6IRPKQh46F2WRpyib5/X4FOpevwGNQEw=
 github.com/matttproud/golang_protobuf_extensions v1.0.1 h1:4hp9jkHxhMHkqkrB3Ix0jegS5sx/RkqARlsWZ6pIwiU=
 github.com/matttproud/golang_protobuf_extensions v1.0.1/go.mod h1:D8He9yQNgCq6Z5Ld7szi9bcBfOoFv/3dc6xSMkL2PC0=

roomserver/internal/input/input_events.go

@@ -271,7 +271,7 @@ func (r *Inputer) calculateAndSetState(
 		}
 		entries = types.DeduplicateStateEntries(entries)
 
-		if stateAtEvent.BeforeStateSnapshotNID, err = r.DB.AddState(ctx, roomInfo.RoomNID, nil, entries); err != nil {
+		if stateAtEvent.BeforeStateSnapshotNID, err = r.DB.AddState(ctx, roomInfo.RoomNID /*nil,*/, entries); err != nil {
 			return fmt.Errorf("r.DB.AddState: %w", err)
 		}
 	} else {

roomserver/internal/perform/perform_backfill.go

@@ -146,7 +146,7 @@ func (r *Backfiller) backfillViaFederation(ctx context.Context, req *api.Perform
 		}
 
 		var beforeStateSnapshotNID types.StateSnapshotNID
-		if beforeStateSnapshotNID, err = r.DB.AddState(ctx, roomNID, nil, entries); err != nil {
+		if beforeStateSnapshotNID, err = r.DB.AddState(ctx, roomNID /*nil,*/, entries); err != nil {
 			logrus.WithError(err).WithField("event_id", ev.EventID()).Error("backfillViaFederation: failed to persist state entries to get snapshot nid")
 			return err
 		}

roomserver/state/state.go

@@ -25,6 +25,7 @@ import (
 	"github.com/matrix-org/dendrite/roomserver/storage"
 	"github.com/matrix-org/util"
 	"github.com/prometheus/client_golang/prometheus"
+	"github.com/sirupsen/logrus"
 
 	"github.com/matrix-org/dendrite/roomserver/types"
 	"github.com/matrix-org/gomatrixserverlib"
@@ -50,32 +51,10 @@ func NewStateResolution(db storage.Database, roomInfo types.RoomInfo) StateResol
 func (v *StateResolution) LoadStateAtSnapshot(
 	ctx context.Context, stateNID types.StateSnapshotNID,
 ) ([]types.StateEntry, error) {
-	stateBlockNIDLists, err := v.db.StateBlockNIDs(ctx, []types.StateSnapshotNID{stateNID})
+	fullState, err := v.db.StateEntries(ctx, stateNID)
 	if err != nil {
-		return nil, err
+		return nil, fmt.Errorf("v.db.StateEntries: %w", err)
 	}
-	// We've asked for exactly one snapshot from the db so we should have exactly one entry in the result.
-	stateBlockNIDList := stateBlockNIDLists[0]
-
-	stateEntryLists, err := v.db.StateEntries(ctx, stateBlockNIDList.StateBlockNIDs)
-	if err != nil {
-		return nil, err
-	}
-	stateEntriesMap := stateEntryListMap(stateEntryLists)
-
-	// Combine all the state entries for this snapshot.
-	// The order of state block NIDs in the list tells us the order to combine them in.
-	var fullState []types.StateEntry
-	for _, stateBlockNID := range stateBlockNIDList.StateBlockNIDs {
-		entries, ok := stateEntriesMap.lookup(stateBlockNID)
-		if !ok {
-			// This should only get hit if the database is corrupt.
-			// It should be impossible for an event to reference a NID that doesn't exist
-			panic(fmt.Errorf("Corrupt DB: Missing state block numeric ID %d", stateBlockNID))
-		}
-		fullState = append(fullState, entries...)
-	}
-
 	// Stable sort so that the most recent entry for each state key stays
 	// remains later in the list than the older entries for the same state key.
 	sort.Stable(stateEntryByStateKeySorter(fullState))
@@ -95,12 +74,10 @@ func (v *StateResolution) LoadStateAtEvent(
 	if snapshotNID == 0 {
 		return nil, fmt.Errorf("LoadStateAtEvent.SnapshotNIDFromEventID(%s) returned 0 NID, was this event stored?", eventID)
 	}
-
 	stateEntries, err := v.LoadStateAtSnapshot(ctx, snapshotNID)
 	if err != nil {
-		return nil, err
+		return nil, fmt.Errorf("v.LoadStateAtSnapshot: %w", err)
 	}
-
 	return stateEntries, nil
 }
 
@@ -114,53 +91,33 @@ func (v *StateResolution) LoadCombinedStateAfterEvents(
 	for i, state := range prevStates {
 		stateNIDs[i] = state.BeforeStateSnapshotNID
 	}
-	// Fetch the state snapshots for the state before the each prev event from the database.
-	// Deduplicate the IDs before passing them to the database.
-	// There could be duplicates because the events could be state events where
-	// the snapshot of the room state before them was the same.
-	stateBlockNIDLists, err := v.db.StateBlockNIDs(ctx, UniqueStateSnapshotNIDs(stateNIDs))
-	if err != nil {
-		return nil, fmt.Errorf("v.db.StateBlockNIDs: %w", err)
-	}
 
-	var stateBlockNIDs []types.StateBlockNID
-	for _, list := range stateBlockNIDLists {
-		stateBlockNIDs = append(stateBlockNIDs, list.StateBlockNIDs...)
-	}
 	// Fetch the state entries that will be combined to create the snapshots.
 	// Deduplicate the IDs before passing them to the database.
 	// There could be duplicates because a block of state entries could be reused by
 	// multiple snapshots.
-	stateEntryLists, err := v.db.StateEntries(ctx, uniqueStateBlockNIDs(stateBlockNIDs))
+	stateEntriesMap := map[types.StateSnapshotNID][]types.StateEntry{}
-	if err != nil {
+	for _, nid := range stateNIDs {
-		return nil, fmt.Errorf("v.db.StateEntries: %w", err)
+		entries, err := v.db.StateEntries(ctx, nid)
+		if err != nil {
+			return nil, fmt.Errorf("v.db.StateEntries: %w", err)
+		}
+		stateEntriesMap[nid] = entries
 	}
-	stateBlockNIDsMap := stateBlockNIDListMap(stateBlockNIDLists)
-	stateEntriesMap := stateEntryListMap(stateEntryLists)
 
 	// Combine the entries from all the snapshots of state after each prev event into a single list.
 	var combined []types.StateEntry
 	for _, prevState := range prevStates {
-		// Grab the list of state data NIDs for this snapshot.
-		stateBlockNIDs, ok := stateBlockNIDsMap.lookup(prevState.BeforeStateSnapshotNID)
-		if !ok {
-			// This should only get hit if the database is corrupt.
-			// It should be impossible for an event to reference a NID that doesn't exist
-			panic(fmt.Errorf("Corrupt DB: Missing state snapshot numeric ID %d", prevState.BeforeStateSnapshotNID))
-		}
-
 		// Combine all the state entries for this snapshot.
 		// The order of state block NIDs in the list tells us the order to combine them in.
 		var fullState []types.StateEntry
-		for _, stateBlockNID := range stateBlockNIDs {
+		entries, ok := stateEntriesMap[prevState.BeforeStateSnapshotNID]
-			entries, ok := stateEntriesMap.lookup(stateBlockNID)
+		if !ok {
-			if !ok {
+			// This should only get hit if the database is corrupt.
-				// This should only get hit if the database is corrupt.
+			// It should be impossible for an event to reference a NID that doesn't exist
-				// It should be impossible for an event to reference a NID that doesn't exist
+			panic(fmt.Errorf("Corrupt DB: Missing state snapshot %d", prevState.BeforeStateSnapshotNID))
-				panic(fmt.Errorf("Corrupt DB: Missing state block numeric ID %d", stateBlockNID))
-			}
-			fullState = append(fullState, entries...)
 		}
+		fullState = append(fullState, entries...)
 		if prevState.IsStateEvent() && !prevState.IsRejected {
 			// If the prev event was a state event then add an entry for the event itself
 			// so that we get the state after the event rather than the state before.
@@ -192,13 +149,13 @@ func (v *StateResolution) DifferenceBetweeenStateSnapshots(
 	if oldStateNID != 0 {
 		oldEntries, err = v.LoadStateAtSnapshot(ctx, oldStateNID)
 		if err != nil {
-			return nil, nil, err
+			return nil, nil, fmt.Errorf("v.LoadStateAtSnapshot: %w", err)
 		}
 	}
 	if newStateNID != 0 {
 		newEntries, err = v.LoadStateAtSnapshot(ctx, newStateNID)
 		if err != nil {
-			return nil, nil, err
+			return nil, nil, fmt.Errorf("v.LoadStateAtSnapshot: %w", err)
 		}
 	}
 
@@ -299,33 +256,9 @@ func (v *StateResolution) loadStateAtSnapshotForNumericTuples(
 	stateNID types.StateSnapshotNID,
 	stateKeyTuples []types.StateKeyTuple,
 ) ([]types.StateEntry, error) {
-	stateBlockNIDLists, err := v.db.StateBlockNIDs(ctx, []types.StateSnapshotNID{stateNID})
+	fullState, err := v.db.StateEntries(ctx, stateNID)
 	if err != nil {
-		return nil, err
+		return nil, fmt.Errorf("v.db.StateEntries: %w", err)
-	}
-	// We've asked for exactly one snapshot from the db so we should have exactly one entry in the result.
-	stateBlockNIDList := stateBlockNIDLists[0]
-
-	stateEntryLists, err := v.db.StateEntriesForTuples(
-		ctx, stateBlockNIDList.StateBlockNIDs, stateKeyTuples,
-	)
-	if err != nil {
-		return nil, err
-	}
-	stateEntriesMap := stateEntryListMap(stateEntryLists)
-
-	// Combine all the state entries for this snapshot.
-	// The order of state block NIDs in the list tells us the order to combine them in.
-	var fullState []types.StateEntry
-	for _, stateBlockNID := range stateBlockNIDList.StateBlockNIDs {
-		entries, ok := stateEntriesMap.lookup(stateBlockNID)
-		if !ok {
-			// If the block is missing from the map it means that none of its entries matched a requested tuple.
-			// This can happen if the block doesn't contain an update for one of the requested tuples.
-			// If none of the requested tuples are in the block then it can be safely skipped.
-			continue
-		}
-		fullState = append(fullState, entries...)
 	}
 
 	// Stable sort so that the most recent entry for each state key stays
@@ -549,7 +482,8 @@ func (v *StateResolution) CalculateAndStoreStateAfterEvents(
 		// 2) There weren't any prev_events for this event so the state is
 		// empty.
 		metrics.algorithm = "empty_state"
-		stateNID, err := v.db.AddState(ctx, v.roomInfo.RoomNID, nil, nil)
+		stateNID, err := v.db.AddState(ctx, v.roomInfo.RoomNID /*nil,*/, nil)
+		logrus.Warnf("Empty prev state added state snapshot %d", stateNID)
 		if err != nil {
 			err = fmt.Errorf("v.db.AddState: %w", err)
 		}
@@ -566,28 +500,56 @@ func (v *StateResolution) CalculateAndStoreStateAfterEvents(
 			metrics.algorithm = "no_change"
 			return metrics.stop(prevState.BeforeStateSnapshotNID, nil)
 		}
-		// The previous event was a state event so we need to store a copy
+
-		// of the previous state updated with that event.
+		oldState, err := v.db.StateEntries(
-		stateBlockNIDLists, err := v.db.StateBlockNIDs(
+			ctx, prevState.BeforeStateSnapshotNID,
-			ctx, []types.StateSnapshotNID{prevState.BeforeStateSnapshotNID},
 		)
 		if err != nil {
-			metrics.algorithm = "_load_state_blocks"
+			return 0, fmt.Errorf("v.db.StateEntries: %w", err)
-			return metrics.stop(0, fmt.Errorf("v.db.StateBlockNIDs: %w", err))
 		}
-		stateBlockNIDs := stateBlockNIDLists[0].StateBlockNIDs
+		found := false
-		if len(stateBlockNIDs) < maxStateBlockNIDs {
+		for _, s := range oldState {
-			// 4) The number of state data blocks is small enough that we can just
+			if s.EventNID == prevState.StateEntry.EventNID {
-			// add the state event as a block of size one to the end of the blocks.
+				found = true
-			metrics.algorithm = "single_delta"
+				break
-			stateNID, err := v.db.AddState(
+			}
-				ctx, v.roomInfo.RoomNID, stateBlockNIDs, []types.StateEntry{prevState.StateEntry},
+		}
+		if !found {
+			oldState = append(oldState, prevState.StateEntry)
+		}
+
+		stateNID, err := v.db.AddState(
+			ctx, v.roomInfo.RoomNID, oldState,
+		)
+		logrus.Warnf("Single prev state added state snapshot %d", stateNID)
+		if err != nil {
+			return 0, fmt.Errorf("v.db.AddState: %w", err)
+		}
+		return stateNID, nil
+		/*
+			// The previous event was a state event so we need to store a copy
+			// of the previous state updated with that event.
+			stateBlockNIDLists, err := v.db.StateBlockNIDs(
+				ctx, []types.StateSnapshotNID{prevState.BeforeStateSnapshotNID},
 			)
 			if err != nil {
-				err = fmt.Errorf("v.db.AddState: %w", err)
+				metrics.algorithm = "_load_state_blocks"
+				return metrics.stop(0, fmt.Errorf("v.db.StateBlockNIDs: %w", err))
 			}
-			return metrics.stop(stateNID, err)
+			stateBlockNIDs := stateBlockNIDLists[0].StateBlockNIDs
-		}
+			if len(stateBlockNIDs) < maxStateBlockNIDs {
+				// 4) The number of state data blocks is small enough that we can just
+				// add the state event as a block of size one to the end of the blocks.
+				metrics.algorithm = "single_delta"
+				stateNID, err := v.db.AddState(
+					ctx, v.roomInfo.RoomNID, stateBlockNIDs, []types.StateEntry{prevState.StateEntry},
+				)
+				if err != nil {
+					err = fmt.Errorf("v.db.AddState: %w", err)
+				}
+				return metrics.stop(stateNID, err)
+			}
+		*/
 		// If there are too many deltas then we need to calculate the full state
 		// So fall through to calculateAndStoreStateAfterManyEvents
 	}
@@ -596,6 +558,7 @@ func (v *StateResolution) CalculateAndStoreStateAfterEvents(
 	if err != nil {
 		return 0, fmt.Errorf("v.calculateAndStoreStateAfterManyEvents: %w", err)
 	}
+	logrus.Warnf("Multiple prev states added state snapshot %d", stateNID)
 	return stateNID, nil
 }
 
@@ -626,7 +589,7 @@ func (v *StateResolution) calculateAndStoreStateAfterManyEvents(
 	// previous state.
 	metrics.conflictLength = conflictLength
 	metrics.fullStateLength = len(state)
-	return metrics.stop(v.db.AddState(ctx, roomNID, nil, state))
+	return metrics.stop(v.db.AddState(ctx, roomNID /*nil,*/, state))
 }
 
 func (v *StateResolution) calculateStateAfterManyEvents(
@@ -996,34 +959,6 @@ func (s stateEntrySorter) Len() int           { return len(s) }
 func (s stateEntrySorter) Less(i, j int) bool { return s[i].LessThan(s[j]) }
 func (s stateEntrySorter) Swap(i, j int)      { s[i], s[j] = s[j], s[i] }
 
-type stateBlockNIDListMap []types.StateBlockNIDList
-
-func (m stateBlockNIDListMap) lookup(stateNID types.StateSnapshotNID) (stateBlockNIDs []types.StateBlockNID, ok bool) {
-	list := []types.StateBlockNIDList(m)
-	i := sort.Search(len(list), func(i int) bool {
-		return list[i].StateSnapshotNID >= stateNID
-	})
-	if i < len(list) && list[i].StateSnapshotNID == stateNID {
-		ok = true
-		stateBlockNIDs = list[i].StateBlockNIDs
-	}
-	return
-}
-
-type stateEntryListMap []types.StateEntryList
-
-func (m stateEntryListMap) lookup(stateBlockNID types.StateBlockNID) (stateEntries []types.StateEntry, ok bool) {
-	list := []types.StateEntryList(m)
-	i := sort.Search(len(list), func(i int) bool {
-		return list[i].StateBlockNID >= stateBlockNID
-	})
-	if i < len(list) && list[i].StateBlockNID == stateBlockNID {
-		ok = true
-		stateEntries = list[i].StateEntries
-	}
-	return
-}
-
 type stateEntryByStateKeySorter []types.StateEntry
 
 func (s stateEntryByStateKeySorter) Len() int { return len(s) }

roomserver/storage/interface.go

@@ -33,7 +33,6 @@ type Database interface {
 	AddState(
 		ctx context.Context,
 		roomNID types.RoomNID,
-		stateBlockNIDs []types.StateBlockNID,
 		state []types.StateEntry,
 	) (types.StateSnapshotNID, error)
 	// Look up the state of a room at each event for a list of string event IDs.
@@ -47,21 +46,9 @@ type Database interface {
 	// Look up the numeric IDs for a list of string event state keys.
 	// Returns a map from string state key to numeric ID for the state key.
 	EventStateKeyNIDs(ctx context.Context, eventStateKeys []string) (map[string]types.EventStateKeyNID, error)
-	// Look up the numeric state data IDs for each numeric state snapshot ID
-	// The returned slice is sorted by numeric state snapshot ID.
-	StateBlockNIDs(ctx context.Context, stateNIDs []types.StateSnapshotNID) ([]types.StateBlockNIDList, error)
 	// Look up the state data for each numeric state data ID
 	// The returned slice is sorted by numeric state data ID.
-	StateEntries(ctx context.Context, stateBlockNIDs []types.StateBlockNID) ([]types.StateEntryList, error)
+	StateEntries(ctx context.Context, stateSnapshotNID types.StateSnapshotNID) ([]types.StateEntry, error)
-	// Look up the state data for the state key tuples for each numeric state block ID
-	// This is used to fetch a subset of the room state at a snapshot.
-	// If a block doesn't contain any of the requested tuples then it can be discarded from the result.
-	// The returned slice is sorted by numeric state block ID.
-	StateEntriesForTuples(
-		ctx context.Context,
-		stateBlockNIDs []types.StateBlockNID,
-		stateKeyTuples []types.StateKeyTuple,
-	) ([]types.StateEntryList, error)
 	// Look up the Events for a list of numeric event IDs.
 	// Returns a sorted list of events.
 	Events(ctx context.Context, eventNIDs []types.EventNID) ([]types.Event, error)

roomserver/storage/postgres/events_table.go

@@ -88,6 +88,12 @@ const bulkSelectStateEventByIDSQL = "" +
 	" WHERE event_id = ANY($1)" +
 	" ORDER BY event_type_nid, event_state_key_nid ASC"
 
+// Bulk lookup of events by numeric ID.
+const bulkSelectStateEventByNIDSQL = "" +
+	"SELECT event_type_nid, event_state_key_nid, event_nid FROM roomserver_events" +
+	" WHERE event_nid = ANY($1)" +
+	" ORDER BY event_type_nid, event_state_key_nid ASC"
+
 const bulkSelectStateAtEventByIDSQL = "" +
 	"SELECT event_type_nid, event_state_key_nid, event_nid, state_snapshot_nid, is_rejected FROM roomserver_events" +
 	" WHERE event_id = ANY($1)"
@@ -127,6 +133,7 @@ type eventStatements struct {
 	insertEventStmt                        *sql.Stmt
 	selectEventStmt                        *sql.Stmt
 	bulkSelectStateEventByIDStmt           *sql.Stmt
+	bulkSelectStateEventByNIDStmt          *sql.Stmt
 	bulkSelectStateAtEventByIDStmt         *sql.Stmt
 	updateEventStateStmt                   *sql.Stmt
 	selectEventSentToOutputStmt            *sql.Stmt
@@ -151,6 +158,7 @@ func NewPostgresEventsTable(db *sql.DB) (tables.Events, error) {
 		{&s.insertEventStmt, insertEventSQL},
 		{&s.selectEventStmt, selectEventSQL},
 		{&s.bulkSelectStateEventByIDStmt, bulkSelectStateEventByIDSQL},
+		{&s.bulkSelectStateEventByNIDStmt, bulkSelectStateEventByNIDSQL},
 		{&s.bulkSelectStateAtEventByIDStmt, bulkSelectStateAtEventByIDSQL},
 		{&s.updateEventStateStmt, updateEventStateSQL},
 		{&s.updateEventSentToOutputStmt, updateEventSentToOutputSQL},
@@ -238,6 +246,48 @@ func (s *eventStatements) BulkSelectStateEventByID(
 	return results, nil
 }
 
+// bulkSelectStateEventByNID lookups a list of state events by internal numeric ID.
+// If any of the requested events are missing from the database it returns a types.MissingEventError
+func (s *eventStatements) BulkSelectStateEventByNID(
+	ctx context.Context, eventNIDs []types.EventNID,
+) ([]types.StateEntry, error) {
+	rows, err := s.bulkSelectStateEventByNIDStmt.QueryContext(ctx, eventNIDsAsArray(eventNIDs))
+	if err != nil {
+		return nil, err
+	}
+	defer internal.CloseAndLogIfError(ctx, rows, "bulkSelectStateEventByID: rows.close() failed")
+	// We know that we will only get as many results as event NIDs
+	// because of the unique constraint on event NIDs.
+	// So we can allocate an array of the correct size now.
+	// We might get fewer results than NIDs so we adjust the length of the slice before returning it.
+	results := make([]types.StateEntry, len(eventNIDs))
+	i := 0
+	for ; rows.Next(); i++ {
+		result := &results[i]
+		if err = rows.Scan(
+			&result.EventTypeNID,
+			&result.EventStateKeyNID,
+			&result.EventNID,
+		); err != nil {
+			return nil, err
+		}
+	}
+	if err = rows.Err(); err != nil {
+		return nil, err
+	}
+	if i != len(eventNIDs) {
+		// If there are fewer rows returned than IDs then we were asked to lookup event IDs we don't have.
+		// We don't know which ones were missing because we don't return the string IDs in the query.
+		// However it should be possible debug this by replaying queries or entries from the input kafka logs.
+		// If this turns out to be impossible and we do need the debug information here, it would be better
+		// to do it as a separate query rather than slowing down/complicating the internal case.
+		return nil, types.MissingEventError(
+			fmt.Sprintf("storage: state event IDs missing from the database (%d != %d)", i, len(eventNIDs)),
+		)
+	}
+	return results, nil
+}
+
 // bulkSelectStateAtEventByID lookups the state at a list of events by event ID.
 // If any of the requested events are missing from the database it returns a types.MissingEventError.
 // If we do not have the state for any of the requested events it returns a types.MissingEventError.

roomserver/storage/postgres/state_block_table.go

@@ -1,292 +0,0 @@
-// Copyright 2017-2018 New Vector Ltd
-// Copyright 2019-2020 The Matrix.org Foundation C.I.C.
-//
-// Licensed under the Apache License, Version 2.0 (the "License");
-// you may not use this file except in compliance with the License.
-// You may obtain a copy of the License at
-//
-//     http://www.apache.org/licenses/LICENSE-2.0
-//
-// Unless required by applicable law or agreed to in writing, software
-// distributed under the License is distributed on an "AS IS" BASIS,
-// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-// See the License for the specific language governing permissions and
-// limitations under the License.
-
-package postgres
-
-import (
-	"context"
-	"database/sql"
-	"fmt"
-	"sort"
-
-	"github.com/lib/pq"
-	"github.com/matrix-org/dendrite/internal"
-	"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/util"
-)
-
-const stateDataSchema = `
--- The state data map.
--- Designed to give enough information to run the state resolution algorithm
--- without hitting the database in the internal case.
--- TODO: Is it worth replacing the unique btree index with a covering index so
--- that postgres could lookup the state using an index-only scan?
--- The type and state_key are included in the index to make it easier to
--- lookup a specific (type, state_key) pair for an event. It also makes it easy
--- to read the state for a given state_block_nid ordered by (type, state_key)
--- which in turn makes it easier to merge state data blocks.
-CREATE SEQUENCE IF NOT EXISTS roomserver_state_block_nid_seq;
-CREATE TABLE IF NOT EXISTS roomserver_state_block (
-    -- Local numeric ID for this state data.
-    state_block_nid bigint NOT NULL,
-    event_type_nid bigint NOT NULL,
-    event_state_key_nid bigint NOT NULL,
-    event_nid bigint NOT NULL,
-    UNIQUE (state_block_nid, event_type_nid, event_state_key_nid)
-);
-`
-
-const insertStateDataSQL = "" +
-	"INSERT INTO roomserver_state_block (state_block_nid, event_type_nid, event_state_key_nid, event_nid)" +
-	" VALUES ($1, $2, $3, $4)"
-
-const selectNextStateBlockNIDSQL = "" +
-	"SELECT nextval('roomserver_state_block_nid_seq')"
-
-// Bulk state lookup by numeric state block ID.
-// Sort by the state_block_nid, event_type_nid, event_state_key_nid
-// This means that all the entries for a given state_block_nid will appear
-// together in the list and those entries will sorted by event_type_nid
-// and event_state_key_nid. This property makes it easier to merge two
-// state data blocks together.
-const bulkSelectStateBlockEntriesSQL = "" +
-	"SELECT state_block_nid, event_type_nid, event_state_key_nid, event_nid" +
-	" FROM roomserver_state_block WHERE state_block_nid = ANY($1)" +
-	" ORDER BY state_block_nid, event_type_nid, event_state_key_nid"
-
-// Bulk state lookup by numeric state block ID.
-// Filters the rows in each block to the requested types and state keys.
-// We would like to restrict to particular type state key pairs but we are
-// restricted by the query language to pull the cross product of a list
-// of types and a list state_keys. So we have to filter the result in the
-// application to restrict it to the list of event types and state keys we
-// actually wanted.
-const bulkSelectFilteredStateBlockEntriesSQL = "" +
-	"SELECT state_block_nid, event_type_nid, event_state_key_nid, event_nid" +
-	" FROM roomserver_state_block WHERE state_block_nid = ANY($1)" +
-	" AND event_type_nid = ANY($2) AND event_state_key_nid = ANY($3)" +
-	" ORDER BY state_block_nid, event_type_nid, event_state_key_nid"
-
-type stateBlockStatements struct {
-	insertStateDataStmt                     *sql.Stmt
-	selectNextStateBlockNIDStmt             *sql.Stmt
-	bulkSelectStateBlockEntriesStmt         *sql.Stmt
-	bulkSelectFilteredStateBlockEntriesStmt *sql.Stmt
-}
-
-func NewPostgresStateBlockTable(db *sql.DB) (tables.StateBlock, error) {
-	s := &stateBlockStatements{}
-	_, err := db.Exec(stateDataSchema)
-	if err != nil {
-		return nil, err
-	}
-
-	return s, shared.StatementList{
-		{&s.insertStateDataStmt, insertStateDataSQL},
-		{&s.selectNextStateBlockNIDStmt, selectNextStateBlockNIDSQL},
-		{&s.bulkSelectStateBlockEntriesStmt, bulkSelectStateBlockEntriesSQL},
-		{&s.bulkSelectFilteredStateBlockEntriesStmt, bulkSelectFilteredStateBlockEntriesSQL},
-	}.Prepare(db)
-}
-
-func (s *stateBlockStatements) BulkInsertStateData(
-	ctx context.Context,
-	txn *sql.Tx,
-	entries []types.StateEntry,
-) (types.StateBlockNID, error) {
-	stateBlockNID, err := s.selectNextStateBlockNID(ctx)
-	if err != nil {
-		return 0, err
-	}
-	for _, entry := range entries {
-		_, err := s.insertStateDataStmt.ExecContext(
-			ctx,
-			int64(stateBlockNID),
-			int64(entry.EventTypeNID),
-			int64(entry.EventStateKeyNID),
-			int64(entry.EventNID),
-		)
-		if err != nil {
-			return 0, err
-		}
-	}
-	return stateBlockNID, nil
-}
-
-func (s *stateBlockStatements) selectNextStateBlockNID(
-	ctx context.Context,
-) (types.StateBlockNID, error) {
-	var stateBlockNID int64
-	err := s.selectNextStateBlockNIDStmt.QueryRowContext(ctx).Scan(&stateBlockNID)
-	return types.StateBlockNID(stateBlockNID), err
-}
-
-func (s *stateBlockStatements) BulkSelectStateBlockEntries(
-	ctx context.Context, stateBlockNIDs []types.StateBlockNID,
-) ([]types.StateEntryList, error) {
-	nids := make([]int64, len(stateBlockNIDs))
-	for i := range stateBlockNIDs {
-		nids[i] = int64(stateBlockNIDs[i])
-	}
-	rows, err := s.bulkSelectStateBlockEntriesStmt.QueryContext(ctx, pq.Int64Array(nids))
-	if err != nil {
-		return nil, err
-	}
-	defer internal.CloseAndLogIfError(ctx, rows, "bulkSelectStateBlockEntries: rows.close() failed")
-
-	results := make([]types.StateEntryList, len(stateBlockNIDs))
-	// current is a pointer to the StateEntryList to append the state entries to.
-	var current *types.StateEntryList
-	i := 0
-	for rows.Next() {
-		var (
-			stateBlockNID    int64
-			eventTypeNID     int64
-			eventStateKeyNID int64
-			eventNID         int64
-			entry            types.StateEntry
-		)
-		if err = rows.Scan(
-			&stateBlockNID, &eventTypeNID, &eventStateKeyNID, &eventNID,
-		); err != nil {
-			return nil, err
-		}
-		entry.EventTypeNID = types.EventTypeNID(eventTypeNID)
-		entry.EventStateKeyNID = types.EventStateKeyNID(eventStateKeyNID)
-		entry.EventNID = types.EventNID(eventNID)
-		if current == nil || types.StateBlockNID(stateBlockNID) != current.StateBlockNID {
-			// The state entry row is for a different state data block to the current one.
-			// So we start appending to the next entry in the list.
-			current = &results[i]
-			current.StateBlockNID = types.StateBlockNID(stateBlockNID)
-			i++
-		}
-		current.StateEntries = append(current.StateEntries, entry)
-	}
-	if err = rows.Err(); err != nil {
-		return nil, err
-	}
-	if i != len(stateBlockNIDs) {
-		return nil, fmt.Errorf("storage: state data NIDs missing from the database (%d != %d)", i, len(stateBlockNIDs))
-	}
-	return results, err
-}
-
-func (s *stateBlockStatements) BulkSelectFilteredStateBlockEntries(
-	ctx context.Context,
-	stateBlockNIDs []types.StateBlockNID,
-	stateKeyTuples []types.StateKeyTuple,
-) ([]types.StateEntryList, error) {
-	tuples := stateKeyTupleSorter(stateKeyTuples)
-	// Sort the tuples so that we can run binary search against them as we filter the rows returned by the db.
-	sort.Sort(tuples)
-
-	eventTypeNIDArray, eventStateKeyNIDArray := tuples.typesAndStateKeysAsArrays()
-	rows, err := s.bulkSelectFilteredStateBlockEntriesStmt.QueryContext(
-		ctx,
-		stateBlockNIDsAsArray(stateBlockNIDs),
-		eventTypeNIDArray,
-		eventStateKeyNIDArray,
-	)
-	if err != nil {
-		return nil, err
-	}
-	defer internal.CloseAndLogIfError(ctx, rows, "bulkSelectFilteredStateBlockEntries: rows.close() failed")
-
-	var results []types.StateEntryList
-	var current types.StateEntryList
-	for rows.Next() {
-		var (
-			stateBlockNID    int64
-			eventTypeNID     int64
-			eventStateKeyNID int64
-			eventNID         int64
-			entry            types.StateEntry
-		)
-		if err := rows.Scan(
-			&stateBlockNID, &eventTypeNID, &eventStateKeyNID, &eventNID,
-		); err != nil {
-			return nil, err
-		}
-		entry.EventTypeNID = types.EventTypeNID(eventTypeNID)
-		entry.EventStateKeyNID = types.EventStateKeyNID(eventStateKeyNID)
-		entry.EventNID = types.EventNID(eventNID)
-
-		// We can use binary search here because we sorted the tuples earlier
-		if !tuples.contains(entry.StateKeyTuple) {
-			// The select will return the cross product of types and state keys.
-			// So we need to check if type of the entry is in the list.
-			continue
-		}
-
-		if types.StateBlockNID(stateBlockNID) != current.StateBlockNID {
-			// The state entry row is for a different state data block to the current one.
-			// So we append the current entry to the results and start adding to a new one.
-			// The first time through the loop current will be empty.
-			if current.StateEntries != nil {
-				results = append(results, current)
-			}
-			current = types.StateEntryList{StateBlockNID: types.StateBlockNID(stateBlockNID)}
-		}
-		current.StateEntries = append(current.StateEntries, entry)
-	}
-	// Add the last entry to the list if it is not empty.
-	if current.StateEntries != nil {
-		results = append(results, current)
-	}
-	return results, rows.Err()
-}
-
-func stateBlockNIDsAsArray(stateBlockNIDs []types.StateBlockNID) pq.Int64Array {
-	nids := make([]int64, len(stateBlockNIDs))
-	for i := range stateBlockNIDs {
-		nids[i] = int64(stateBlockNIDs[i])
-	}
-	return pq.Int64Array(nids)
-}
-
-type stateKeyTupleSorter []types.StateKeyTuple
-
-func (s stateKeyTupleSorter) Len() int           { return len(s) }
-func (s stateKeyTupleSorter) Less(i, j int) bool { return s[i].LessThan(s[j]) }
-func (s stateKeyTupleSorter) Swap(i, j int)      { s[i], s[j] = s[j], s[i] }
-
-// Check whether a tuple is in the list. Assumes that the list is sorted.
-func (s stateKeyTupleSorter) contains(value types.StateKeyTuple) bool {
-	i := sort.Search(len(s), func(i int) bool { return !s[i].LessThan(value) })
-	return i < len(s) && s[i] == value
-}
-
-// List the unique eventTypeNIDs and eventStateKeyNIDs.
-// Assumes that the list is sorted.
-func (s stateKeyTupleSorter) typesAndStateKeysAsArrays() (eventTypeNIDs pq.Int64Array, eventStateKeyNIDs pq.Int64Array) {
-	eventTypeNIDs = make(pq.Int64Array, len(s))
-	eventStateKeyNIDs = make(pq.Int64Array, len(s))
-	for i := range s {
-		eventTypeNIDs[i] = int64(s[i].EventTypeNID)
-		eventStateKeyNIDs[i] = int64(s[i].EventStateKeyNID)
-	}
-	eventTypeNIDs = eventTypeNIDs[:util.SortAndUnique(int64Sorter(eventTypeNIDs))]
-	eventStateKeyNIDs = eventStateKeyNIDs[:util.SortAndUnique(int64Sorter(eventStateKeyNIDs))]
-	return
-}
-
-type int64Sorter []int64
-
-func (s int64Sorter) Len() int           { return len(s) }
-func (s int64Sorter) Less(i, j int) bool { return s[i] < s[j] }
-func (s int64Sorter) Swap(i, j int)      { s[i], s[j] = s[j], s[i] }

roomserver/storage/postgres/state_block_table_test.go

@@ -1,86 +0,0 @@
-// Copyright 2017-2018 New Vector Ltd
-// Copyright 2019-2020 The Matrix.org Foundation C.I.C.
-//
-// Licensed under the Apache License, Version 2.0 (the "License");
-// you may not use this file except in compliance with the License.
-// You may obtain a copy of the License at
-//
-//     http://www.apache.org/licenses/LICENSE-2.0
-//
-// Unless required by applicable law or agreed to in writing, software
-// distributed under the License is distributed on an "AS IS" BASIS,
-// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-// See the License for the specific language governing permissions and
-// limitations under the License.
-
-package postgres
-
-import (
-	"sort"
-	"testing"
-
-	"github.com/matrix-org/dendrite/roomserver/types"
-)
-
-func TestStateKeyTupleSorter(t *testing.T) {
-	input := stateKeyTupleSorter{
-		{EventTypeNID: 1, EventStateKeyNID: 2},
-		{EventTypeNID: 1, EventStateKeyNID: 4},
-		{EventTypeNID: 2, EventStateKeyNID: 2},
-		{EventTypeNID: 1, EventStateKeyNID: 1},
-	}
-	want := []types.StateKeyTuple{
-		{EventTypeNID: 1, EventStateKeyNID: 1},
-		{EventTypeNID: 1, EventStateKeyNID: 2},
-		{EventTypeNID: 1, EventStateKeyNID: 4},
-		{EventTypeNID: 2, EventStateKeyNID: 2},
-	}
-	doNotWant := []types.StateKeyTuple{
-		{EventTypeNID: 0, EventStateKeyNID: 0},
-		{EventTypeNID: 1, EventStateKeyNID: 3},
-		{EventTypeNID: 2, EventStateKeyNID: 1},
-		{EventTypeNID: 3, EventStateKeyNID: 1},
-	}
-	wantTypeNIDs := []int64{1, 2}
-	wantStateKeyNIDs := []int64{1, 2, 4}
-
-	// Sort the input and check it's in the right order.
-	sort.Sort(input)
-	gotTypeNIDs, gotStateKeyNIDs := input.typesAndStateKeysAsArrays()
-
-	for i := range want {
-		if input[i] != want[i] {
-			t.Errorf("Wanted %#v at index %d got %#v", want[i], i, input[i])
-		}
-
-		if !input.contains(want[i]) {
-			t.Errorf("Wanted %#v.contains(%#v) to be true but got false", input, want[i])
-		}
-	}
-
-	for i := range doNotWant {
-		if input.contains(doNotWant[i]) {
-			t.Errorf("Wanted %#v.contains(%#v) to be false but got true", input, doNotWant[i])
-		}
-	}
-
-	if len(wantTypeNIDs) != len(gotTypeNIDs) {
-		t.Fatalf("Wanted type NIDs %#v got %#v", wantTypeNIDs, gotTypeNIDs)
-	}
-
-	for i := range wantTypeNIDs {
-		if wantTypeNIDs[i] != gotTypeNIDs[i] {
-			t.Fatalf("Wanted type NIDs %#v got %#v", wantTypeNIDs, gotTypeNIDs)
-		}
-	}
-
-	if len(wantStateKeyNIDs) != len(gotStateKeyNIDs) {
-		t.Fatalf("Wanted state key NIDs %#v got %#v", wantStateKeyNIDs, gotStateKeyNIDs)
-	}
-
-	for i := range wantStateKeyNIDs {
-		if wantStateKeyNIDs[i] != gotStateKeyNIDs[i] {
-			t.Fatalf("Wanted type NIDs %#v got %#v", wantTypeNIDs, gotTypeNIDs)
-		}
-	}
-}

roomserver/storage/postgres/state_snapshot_table.go

@@ -1,126 +0,0 @@
-// Copyright 2017-2018 New Vector Ltd
-// Copyright 2019-2020 The Matrix.org Foundation C.I.C.
-//
-// Licensed under the Apache License, Version 2.0 (the "License");
-// you may not use this file except in compliance with the License.
-// You may obtain a copy of the License at
-//
-//     http://www.apache.org/licenses/LICENSE-2.0
-//
-// Unless required by applicable law or agreed to in writing, software
-// distributed under the License is distributed on an "AS IS" BASIS,
-// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-// See the License for the specific language governing permissions and
-// limitations under the License.
-
-package postgres
-
-import (
-	"context"
-	"database/sql"
-	"fmt"
-
-	"github.com/lib/pq"
-	"github.com/matrix-org/dendrite/internal/sqlutil"
-	"github.com/matrix-org/dendrite/roomserver/storage/shared"
-	"github.com/matrix-org/dendrite/roomserver/storage/tables"
-	"github.com/matrix-org/dendrite/roomserver/types"
-)
-
-const stateSnapshotSchema = `
--- The state of a room before an event.
--- Stored as a list of state_block entries stored in a separate table.
--- The actual state is constructed by combining all the state_block entries
--- referenced by state_block_nids together. If the same state key tuple appears
--- multiple times then the entry from the later state_block clobbers the earlier
--- entries.
--- This encoding format allows us to implement a delta encoding which is useful
--- because room state tends to accumulate small changes over time. Although if
--- the list of deltas becomes too long it becomes more efficient to encode
--- the full state under single state_block_nid.
-CREATE SEQUENCE IF NOT EXISTS roomserver_state_snapshot_nid_seq;
-CREATE TABLE IF NOT EXISTS roomserver_state_snapshots (
-    -- Local numeric ID for the state.
-    state_snapshot_nid bigint PRIMARY KEY DEFAULT nextval('roomserver_state_snapshot_nid_seq'),
-    -- Local numeric ID of the room this state is for.
-    -- Unused in normal operation, but useful for background work or ad-hoc debugging.
-    room_nid bigint NOT NULL,
-    -- List of state_block_nids, stored sorted by state_block_nid.
-    state_block_nids bigint[] NOT NULL
-);
-`
-
-const insertStateSQL = "" +
-	"INSERT INTO roomserver_state_snapshots (room_nid, state_block_nids)" +
-	" VALUES ($1, $2)" +
-	" RETURNING state_snapshot_nid"
-
-// Bulk state data NID lookup.
-// Sorting by state_snapshot_nid means we can use binary search over the result
-// to lookup the state data NIDs for a state snapshot NID.
-const bulkSelectStateBlockNIDsSQL = "" +
-	"SELECT state_snapshot_nid, state_block_nids FROM roomserver_state_snapshots" +
-	" WHERE state_snapshot_nid = ANY($1) ORDER BY state_snapshot_nid ASC"
-
-type stateSnapshotStatements struct {
-	insertStateStmt              *sql.Stmt
-	bulkSelectStateBlockNIDsStmt *sql.Stmt
-}
-
-func NewPostgresStateSnapshotTable(db *sql.DB) (tables.StateSnapshot, error) {
-	s := &stateSnapshotStatements{}
-	_, err := db.Exec(stateSnapshotSchema)
-	if err != nil {
-		return nil, err
-	}
-
-	return s, shared.StatementList{
-		{&s.insertStateStmt, insertStateSQL},
-		{&s.bulkSelectStateBlockNIDsStmt, bulkSelectStateBlockNIDsSQL},
-	}.Prepare(db)
-}
-
-func (s *stateSnapshotStatements) InsertState(
-	ctx context.Context, txn *sql.Tx, roomNID types.RoomNID, stateBlockNIDs []types.StateBlockNID,
-) (stateNID types.StateSnapshotNID, err error) {
-	nids := make([]int64, len(stateBlockNIDs))
-	for i := range stateBlockNIDs {
-		nids[i] = int64(stateBlockNIDs[i])
-	}
-	err = sqlutil.TxStmt(txn, s.insertStateStmt).QueryRowContext(ctx, int64(roomNID), pq.Int64Array(nids)).Scan(&stateNID)
-	return
-}
-
-func (s *stateSnapshotStatements) BulkSelectStateBlockNIDs(
-	ctx context.Context, stateNIDs []types.StateSnapshotNID,
-) ([]types.StateBlockNIDList, error) {
-	nids := make([]int64, len(stateNIDs))
-	for i := range stateNIDs {
-		nids[i] = int64(stateNIDs[i])
-	}
-	rows, err := s.bulkSelectStateBlockNIDsStmt.QueryContext(ctx, pq.Int64Array(nids))
-	if err != nil {
-		return nil, err
-	}
-	defer rows.Close() // nolint: errcheck
-	results := make([]types.StateBlockNIDList, len(stateNIDs))
-	i := 0
-	for ; rows.Next(); i++ {
-		result := &results[i]
-		var stateBlockNIDs pq.Int64Array
-		if err = rows.Scan(&result.StateSnapshotNID, &stateBlockNIDs); err != nil {
-			return nil, err
-		}
-		result.StateBlockNIDs = make([]types.StateBlockNID, len(stateBlockNIDs))
-		for k := range stateBlockNIDs {
-			result.StateBlockNIDs[k] = types.StateBlockNID(stateBlockNIDs[k])
-		}
-	}
-	if err = rows.Err(); err != nil {
-		return nil, err
-	}
-	if i != len(stateNIDs) {
-		return nil, fmt.Errorf("storage: state NIDs missing from the database (%d != %d)", i, len(stateNIDs))
-	}
-	return results, nil
-}

roomserver/storage/postgres/state_table.go

@@ -0,0 +1,124 @@
+// Copyright 2017-2018 New Vector Ltd
+// Copyright 2019-2020 The Matrix.org Foundation C.I.C.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package postgres
+
+import (
+	"context"
+	"database/sql"
+	"fmt"
+
+	"github.com/lib/pq"
+	"github.com/matrix-org/dendrite/internal"
+	"github.com/matrix-org/dendrite/internal/sqlutil"
+	"github.com/matrix-org/dendrite/roomserver/storage/shared"
+	"github.com/matrix-org/dendrite/roomserver/storage/tables"
+	"github.com/matrix-org/dendrite/roomserver/types"
+)
+
+const stateSchema = `
+CREATE TABLE IF NOT EXISTS roomserver_state (
+    state_nid BIGSERIAL PRIMARY KEY,
+	room_nid bigint NOT NULL,
+    event_nids bigint[] NOT NULL,
+    UNIQUE (room_nid, event_nids),
+	CONSTRAINT fk_room_id FOREIGN KEY(room_nid) REFERENCES roomserver_rooms(room_nid)
+);
+`
+
+const insertNewStateSnapshotSQL = "" +
+	"INSERT INTO roomserver_state (room_nid, event_nids)" +
+	" VALUES ($1, $2)" +
+	" ON CONFLICT (room_nid, event_nids) DO UPDATE SET room_nid = $1" +
+	" RETURNING state_nid"
+
+const bulkSelectNewStateSnapshotSQL = "" +
+	"SELECT state_nid, event_nids" +
+	" FROM roomserver_state WHERE state_nid = ANY($1)" +
+	" ORDER BY state_nid"
+
+type stateStatements struct {
+	insertStateStmt     *sql.Stmt
+	bulkSelectStateStmt *sql.Stmt
+}
+
+func NewPostgresStateTable(db *sql.DB) (tables.State, error) {
+	s := &stateStatements{}
+	_, err := db.Exec(stateSchema)
+	if err != nil {
+		return nil, err
+	}
+
+	return s, shared.StatementList{
+		{&s.insertStateStmt, insertNewStateSnapshotSQL},
+		{&s.bulkSelectStateStmt, bulkSelectNewStateSnapshotSQL},
+	}.Prepare(db)
+}
+
+func (s *stateStatements) InsertState(
+	ctx context.Context,
+	txn *sql.Tx,
+	roomNID types.RoomNID,
+	eventNIDs []types.EventNID,
+) (types.StateSnapshotNID, error) {
+	stmt := sqlutil.TxStmt(txn, s.insertStateStmt)
+	var id int64
+	var err error
+	eventNIDs = types.DeduplicateEventNIDs(eventNIDs)
+	if err = stmt.QueryRowContext(ctx, int64(roomNID), eventNIDsAsArray(eventNIDs)).Scan(&id); err != nil {
+		return 0, fmt.Errorf("stmt.ExecContext: %w", err)
+	}
+	return types.StateSnapshotNID(id), err
+}
+
+func (s *stateStatements) BulkSelectState(
+	ctx context.Context, stateNIDs []types.StateSnapshotNID,
+) (map[types.StateSnapshotNID][]types.EventNID, error) {
+	rows, err := s.bulkSelectStateStmt.QueryContext(ctx, stateSnapshotNIDsAsArray(stateNIDs))
+	if err != nil {
+		return nil, err
+	}
+	defer internal.CloseAndLogIfError(ctx, rows, "bulkSelectStateBlockEntries: rows.close() failed")
+
+	results := map[types.StateSnapshotNID][]types.EventNID{}
+	for rows.Next() {
+		var stateNID int64
+		var eventNIDs pq.Int64Array
+		if err = rows.Scan(&stateNID, &eventNIDs); err != nil {
+			return nil, err
+		}
+		for _, id := range eventNIDs {
+			results[types.StateSnapshotNID(stateNID)] = append(
+				results[types.StateSnapshotNID(stateNID)],
+				types.EventNID(id),
+			)
+		}
+	}
+	if err = rows.Err(); err != nil {
+		return nil, fmt.Errorf("rows.Err: %w", err)
+	}
+	if len(results) != len(stateNIDs) {
+		return nil, fmt.Errorf("storage: state data NIDs missing from the database (%d != %d)", len(results), len(stateNIDs))
+	}
+	return results, err
+}
+
+func stateSnapshotNIDsAsArray(stateSnapshotNIDs []types.StateSnapshotNID) pq.Int64Array {
+	nids := make([]int64, len(stateSnapshotNIDs))
+	for i := range stateSnapshotNIDs {
+		nids[i] = int64(stateSnapshotNIDs[i])
+	}
+	return nids
+}

roomserver/storage/postgres/storage.go

@@ -86,11 +86,17 @@ func (d *Database) prepare(db *sql.DB, cache caching.RoomServerCaches) (err erro
 	if err != nil {
 		return err
 	}
-	stateBlock, err := NewPostgresStateBlockTable(db)
+	/*
-	if err != nil {
+		stateBlock, err := NewPostgresStateBlockTable(db)
-		return err
+		if err != nil {
-	}
+			return err
-	stateSnapshot, err := NewPostgresStateSnapshotTable(db)
+		}
+		stateSnapshot, err := NewPostgresStateSnapshotTable(db)
+		if err != nil {
+			return err
+		}
+	*/
+	state, err := NewPostgresStateTable(db)
 	if err != nil {
 		return err
 	}
@@ -128,14 +134,15 @@ func (d *Database) prepare(db *sql.DB, cache caching.RoomServerCaches) (err erro
 		EventsTable:         events,
 		RoomsTable:          rooms,
 		TransactionsTable:   transactions,
-		StateBlockTable:     stateBlock,
+		StateTable:          state,
-		StateSnapshotTable:  stateSnapshot,
+		//	StateBlockTable:     stateBlock,
-		PrevEventsTable:     prevEvents,
+		//	StateSnapshotTable:  stateSnapshot,
-		RoomAliasesTable:    roomAliases,
+		PrevEventsTable:  prevEvents,
-		InvitesTable:        invites,
+		RoomAliasesTable: roomAliases,
-		MembershipTable:     membership,
+		InvitesTable:     invites,
-		PublishedTable:      published,
+		MembershipTable:  membership,
-		RedactionsTable:     redactions,
+		PublishedTable:   published,
+		RedactionsTable:  redactions,
 	}
 	return nil
 }

roomserver/storage/shared/storage.go

@@ -5,7 +5,6 @@ import (
 	"database/sql"
 	"encoding/json"
 	"fmt"
-	"sort"
 
 	"github.com/matrix-org/dendrite/internal/caching"
 	"github.com/matrix-org/dendrite/internal/sqlutil"
@@ -13,7 +12,6 @@ import (
 	"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"
 	"github.com/tidwall/gjson"
 )
 
@@ -36,8 +34,7 @@ type Database struct {
 	EventStateKeysTable        tables.EventStateKeys
 	RoomsTable                 tables.Rooms
 	TransactionsTable          tables.Transactions
-	StateSnapshotTable         tables.StateSnapshot
+	StateTable                 tables.State
-	StateBlockTable            tables.StateBlock
 	RoomAliasesTable           tables.RoomAliases
 	PrevEventsTable            tables.PreviousEvents
 	InvitesTable               tables.Invites
@@ -113,16 +110,6 @@ func (d *Database) StateEntriesForEventIDs(
 	return d.EventsTable.BulkSelectStateEventByID(ctx, eventIDs)
 }
 
-func (d *Database) StateEntriesForTuples(
-	ctx context.Context,
-	stateBlockNIDs []types.StateBlockNID,
-	stateKeyTuples []types.StateKeyTuple,
-) ([]types.StateEntryList, error) {
-	return d.StateBlockTable.BulkSelectFilteredStateBlockEntries(
-		ctx, stateBlockNIDs, stateKeyTuples,
-	)
-}
-
 func (d *Database) RoomInfo(ctx context.Context, roomID string) (*types.RoomInfo, error) {
 	if roomInfo, ok := d.Cache.GetRoomInfo(roomID); ok {
 		return &roomInfo, nil
@@ -138,21 +125,16 @@ func (d *Database) RoomInfo(ctx context.Context, roomID string) (*types.RoomInfo
 func (d *Database) AddState(
 	ctx context.Context,
 	roomNID types.RoomNID,
-	stateBlockNIDs []types.StateBlockNID,
 	state []types.StateEntry,
 ) (stateNID types.StateSnapshotNID, err error) {
 	err = d.Writer.Do(d.DB, nil, func(txn *sql.Tx) error {
-		if len(state) > 0 {
+		eventNIDs := make([]types.EventNID, 0, len(state))
-			var stateBlockNID types.StateBlockNID
+		for _, s := range state {
-			stateBlockNID, err = d.StateBlockTable.BulkInsertStateData(ctx, txn, state)
+			eventNIDs = append(eventNIDs, s.EventNID)
-			if err != nil {
-				return fmt.Errorf("d.StateBlockTable.BulkInsertStateData: %w", err)
-			}
-			stateBlockNIDs = append(stateBlockNIDs[:len(stateBlockNIDs):len(stateBlockNIDs)], stateBlockNID)
 		}
-		stateNID, err = d.StateSnapshotTable.InsertState(ctx, txn, roomNID, stateBlockNIDs)
+		stateNID, err = d.StateTable.InsertState(ctx, txn, roomNID, eventNIDs)
 		if err != nil {
-			return fmt.Errorf("d.StateSnapshotTable.InsertState: %w", err)
+			return fmt.Errorf("d.StateTable.InsertState: %w", err)
 		}
 		return nil
 	})
@@ -228,16 +210,22 @@ func (d *Database) LatestEventIDs(
 	return
 }
 
-func (d *Database) StateBlockNIDs(
-	ctx context.Context, stateNIDs []types.StateSnapshotNID,
-) ([]types.StateBlockNIDList, error) {
-	return d.StateSnapshotTable.BulkSelectStateBlockNIDs(ctx, stateNIDs)
-}
-
 func (d *Database) StateEntries(
-	ctx context.Context, stateBlockNIDs []types.StateBlockNID,
+	ctx context.Context, stateSnapshotNID types.StateSnapshotNID,
-) ([]types.StateEntryList, error) {
+) ([]types.StateEntry, error) {
-	return d.StateBlockTable.BulkSelectStateBlockEntries(ctx, stateBlockNIDs)
+	nids, err := d.StateTable.BulkSelectState(ctx, []types.StateSnapshotNID{stateSnapshotNID})
+	if err != nil {
+		return nil, fmt.Errorf("d.StateTable.BulkSelectState: %w", err)
+	}
+	state, ok := nids[stateSnapshotNID]
+	if !ok {
+		return nil, fmt.Errorf("state snapshot %d not found", stateSnapshotNID)
+	}
+	entries, err := d.EventsTable.BulkSelectStateEventByNID(ctx, state)
+	if err != nil {
+		return nil, fmt.Errorf("d.EventsTable.BulkSelectStateEventByNID: %w", err)
+	}
+	return entries, nil
 }
 
 func (d *Database) SetRoomAlias(ctx context.Context, alias string, roomID string, creatorUserID string) error {
@@ -817,9 +805,17 @@ func (d *Database) GetStateEvent(ctx context.Context, roomID, evType, stateKey s
 	if err != nil {
 		return nil, err
 	}
-	entries, err := d.loadStateAtSnapshot(ctx, roomInfo.StateSnapshotNID)
+	snapshots, err := d.StateTable.BulkSelectState(ctx, []types.StateSnapshotNID{roomInfo.StateSnapshotNID})
 	if err != nil {
-		return nil, err
+		return nil, fmt.Errorf("d.StateTable.BulkSelectState: %w", err)
+	}
+	nids, ok := snapshots[roomInfo.StateSnapshotNID]
+	if !ok {
+		return nil, fmt.Errorf("state snapshot %d not found", roomInfo.StateSnapshotNID)
+	}
+	entries, err := d.EventsTable.BulkSelectStateEventByNID(ctx, nids)
+	if err != nil {
+		return nil, fmt.Errorf("d.EventsTable.BulkSelectStateEventByNID: %w", err)
 	}
 	var eventNIDs []types.EventNID
 	for _, e := range entries {
@@ -938,7 +934,7 @@ func (d *Database) GetBulkStateContent(ctx context.Context, roomIDs []string, tu
 		if roomInfo == nil || roomInfo.IsStub {
 			continue
 		}
-		entries, err2 := d.loadStateAtSnapshot(ctx, roomInfo.StateSnapshotNID)
+		entries, err2 := d.StateEntries(ctx, roomInfo.StateSnapshotNID)
 		if err2 != nil {
 			return nil, fmt.Errorf("GetBulkStateContent: failed to load state for room %s : %w", roomID, err2)
 		}
@@ -1039,65 +1035,3 @@ func (d *Database) ForgetRoom(ctx context.Context, userID, roomID string, forget
 		return d.MembershipTable.UpdateForgetMembership(ctx, nil, roomNIDs[0], stateKeyNID, forget)
 	})
 }
-
-// FIXME TODO: Remove all this - horrible dupe with roomserver/state. Can't use the original impl because of circular loops
-// it should live in this package!
-
-func (d *Database) loadStateAtSnapshot(
-	ctx context.Context, stateNID types.StateSnapshotNID,
-) ([]types.StateEntry, error) {
-	stateBlockNIDLists, err := d.StateBlockNIDs(ctx, []types.StateSnapshotNID{stateNID})
-	if err != nil {
-		return nil, err
-	}
-	// We've asked for exactly one snapshot from the db so we should have exactly one entry in the result.
-	stateBlockNIDList := stateBlockNIDLists[0]
-
-	stateEntryLists, err := d.StateEntries(ctx, stateBlockNIDList.StateBlockNIDs)
-	if err != nil {
-		return nil, err
-	}
-	stateEntriesMap := stateEntryListMap(stateEntryLists)
-
-	// Combine all the state entries for this snapshot.
-	// The order of state block NIDs in the list tells us the order to combine them in.
-	var fullState []types.StateEntry
-	for _, stateBlockNID := range stateBlockNIDList.StateBlockNIDs {
-		entries, ok := stateEntriesMap.lookup(stateBlockNID)
-		if !ok {
-			// This should only get hit if the database is corrupt.
-			// It should be impossible for an event to reference a NID that doesn't exist
-			panic(fmt.Errorf("Corrupt DB: Missing state block numeric ID %d", stateBlockNID))
-		}
-		fullState = append(fullState, entries...)
-	}
-
-	// Stable sort so that the most recent entry for each state key stays
-	// remains later in the list than the older entries for the same state key.
-	sort.Stable(stateEntryByStateKeySorter(fullState))
-	// Unique returns the last entry and hence the most recent entry for each state key.
-	fullState = fullState[:util.Unique(stateEntryByStateKeySorter(fullState))]
-	return fullState, nil
-}
-
-type stateEntryListMap []types.StateEntryList
-
-func (m stateEntryListMap) lookup(stateBlockNID types.StateBlockNID) (stateEntries []types.StateEntry, ok bool) {
-	list := []types.StateEntryList(m)
-	i := sort.Search(len(list), func(i int) bool {
-		return list[i].StateBlockNID >= stateBlockNID
-	})
-	if i < len(list) && list[i].StateBlockNID == stateBlockNID {
-		ok = true
-		stateEntries = list[i].StateEntries
-	}
-	return
-}
-
-type stateEntryByStateKeySorter []types.StateEntry
-
-func (s stateEntryByStateKeySorter) Len() int { return len(s) }
-func (s stateEntryByStateKeySorter) Less(i, j int) bool {
-	return s[i].StateKeyTuple.LessThan(s[j].StateKeyTuple)
-}
-func (s stateEntryByStateKeySorter) Swap(i, j int) { s[i], s[j] = s[j], s[i] }

roomserver/storage/sqlite3/events_table.go

@@ -63,6 +63,11 @@ const bulkSelectStateEventByIDSQL = "" +
 	" WHERE event_id IN ($1)" +
 	" ORDER BY event_type_nid, event_state_key_nid ASC"
 
+const bulkSelectStateEventByNIDSQL = "" +
+	"SELECT event_type_nid, event_state_key_nid, event_nid FROM roomserver_events" +
+	" WHERE event_nid IN ($1)" +
+	" ORDER BY event_type_nid, event_state_key_nid ASC"
+
 const bulkSelectStateAtEventByIDSQL = "" +
 	"SELECT event_type_nid, event_state_key_nid, event_nid, state_snapshot_nid, is_rejected FROM roomserver_events" +
 	" WHERE event_id IN ($1)"
@@ -103,6 +108,7 @@ type eventStatements struct {
 	insertEventStmt                        *sql.Stmt
 	selectEventStmt                        *sql.Stmt
 	bulkSelectStateEventByIDStmt           *sql.Stmt
+	bulkSelectStateEventByNIDStmt          *sql.Stmt
 	bulkSelectStateAtEventByIDStmt         *sql.Stmt
 	updateEventStateStmt                   *sql.Stmt
 	selectEventSentToOutputStmt            *sql.Stmt
@@ -128,6 +134,7 @@ func NewSqliteEventsTable(db *sql.DB) (tables.Events, error) {
 		{&s.insertEventStmt, insertEventSQL},
 		{&s.selectEventStmt, selectEventSQL},
 		{&s.bulkSelectStateEventByIDStmt, bulkSelectStateEventByIDSQL},
+		{&s.bulkSelectStateEventByNIDStmt, bulkSelectStateEventByNIDSQL},
 		{&s.bulkSelectStateAtEventByIDStmt, bulkSelectStateAtEventByIDSQL},
 		{&s.updateEventStateStmt, updateEventStateSQL},
 		{&s.updateEventSentToOutputStmt, updateEventSentToOutputSQL},
@@ -232,6 +239,57 @@ func (s *eventStatements) BulkSelectStateEventByID(
 	return results, err
 }
 
+// bulkSelectStateEventByID lookups a list of state events by event ID.
+// If any of the requested events are missing from the database it returns a types.MissingEventError
+func (s *eventStatements) BulkSelectStateEventByNID(
+	ctx context.Context, eventNIDs []types.EventNID,
+) ([]types.StateEntry, error) {
+	///////////////
+	iEventNIDs := make([]interface{}, len(eventNIDs))
+	for k, v := range eventNIDs {
+		iEventNIDs[k] = v
+	}
+	selectOrig := strings.Replace(bulkSelectStateEventByNIDSQL, "($1)", sqlutil.QueryVariadic(len(iEventNIDs)), 1)
+	selectStmt, err := s.db.Prepare(selectOrig)
+	if err != nil {
+		return nil, err
+	}
+	///////////////
+
+	rows, err := selectStmt.QueryContext(ctx, iEventNIDs...)
+	if err != nil {
+		return nil, err
+	}
+	defer internal.CloseAndLogIfError(ctx, rows, "bulkSelectStateEventByID: rows.close() failed")
+	// We know that we will only get as many results as event IDs
+	// because of the unique constraint on event IDs.
+	// So we can allocate an array of the correct size now.
+	// We might get fewer results than IDs so we adjust the length of the slice before returning it.
+	results := make([]types.StateEntry, len(eventNIDs))
+	i := 0
+	for ; rows.Next(); i++ {
+		result := &results[i]
+		if err = rows.Scan(
+			&result.EventTypeNID,
+			&result.EventStateKeyNID,
+			&result.EventNID,
+		); err != nil {
+			return nil, err
+		}
+	}
+	if i != len(eventNIDs) {
+		// If there are fewer rows returned than IDs then we were asked to lookup event IDs we don't have.
+		// We don't know which ones were missing because we don't return the string IDs in the query.
+		// However it should be possible debug this by replaying queries or entries from the input kafka logs.
+		// If this turns out to be impossible and we do need the debug information here, it would be better
+		// to do it as a separate query rather than slowing down/complicating the internal case.
+		return nil, types.MissingEventError(
+			fmt.Sprintf("storage: state event IDs missing from the database (%d != %d)", i, len(eventNIDs)),
+		)
+	}
+	return results, err
+}
+
 // bulkSelectStateAtEventByID lookups the state at a list of events by event ID.
 // If any of the requested events are missing from the database it returns a types.MissingEventError.
 // If we do not have the state for any of the requested events it returns a types.MissingEventError.

roomserver/storage/sqlite3/state_block_table.go

@@ -1,289 +0,0 @@
-// Copyright 2017-2018 New Vector Ltd
-// Copyright 2019-2020 The Matrix.org Foundation C.I.C.
-//
-// Licensed under the Apache License, Version 2.0 (the "License");
-// you may not use this file except in compliance with the License.
-// You may obtain a copy of the License at
-//
-//     http://www.apache.org/licenses/LICENSE-2.0
-//
-// Unless required by applicable law or agreed to in writing, software
-// distributed under the License is distributed on an "AS IS" BASIS,
-// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-// See the License for the specific language governing permissions and
-// limitations under the License.
-
-package sqlite3
-
-import (
-	"context"
-	"database/sql"
-	"fmt"
-	"sort"
-	"strings"
-
-	"github.com/matrix-org/dendrite/internal"
-	"github.com/matrix-org/dendrite/internal/sqlutil"
-	"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/util"
-)
-
-const stateDataSchema = `
-  CREATE TABLE IF NOT EXISTS roomserver_state_block (
-    state_block_nid INTEGER NOT NULL,
-    event_type_nid INTEGER NOT NULL,
-    event_state_key_nid INTEGER NOT NULL,
-    event_nid INTEGER NOT NULL,
-    UNIQUE (state_block_nid, event_type_nid, event_state_key_nid)
-  );
-`
-
-const insertStateDataSQL = "" +
-	"INSERT INTO roomserver_state_block (state_block_nid, event_type_nid, event_state_key_nid, event_nid)" +
-	" VALUES ($1, $2, $3, $4)"
-
-const selectNextStateBlockNIDSQL = `
-SELECT IFNULL(MAX(state_block_nid), 0) + 1 FROM roomserver_state_block
-`
-
-// Bulk state lookup by numeric state block ID.
-// Sort by the state_block_nid, event_type_nid, event_state_key_nid
-// This means that all the entries for a given state_block_nid will appear
-// together in the list and those entries will sorted by event_type_nid
-// and event_state_key_nid. This property makes it easier to merge two
-// state data blocks together.
-const bulkSelectStateBlockEntriesSQL = "" +
-	"SELECT state_block_nid, event_type_nid, event_state_key_nid, event_nid" +
-	" FROM roomserver_state_block WHERE state_block_nid IN ($1)" +
-	" ORDER BY state_block_nid, event_type_nid, event_state_key_nid"
-
-// Bulk state lookup by numeric state block ID.
-// Filters the rows in each block to the requested types and state keys.
-// We would like to restrict to particular type state key pairs but we are
-// restricted by the query language to pull the cross product of a list
-// of types and a list state_keys. So we have to filter the result in the
-// application to restrict it to the list of event types and state keys we
-// actually wanted.
-const bulkSelectFilteredStateBlockEntriesSQL = "" +
-	"SELECT state_block_nid, event_type_nid, event_state_key_nid, event_nid" +
-	" FROM roomserver_state_block WHERE state_block_nid IN ($1)" +
-	" AND event_type_nid IN ($2) AND event_state_key_nid IN ($3)" +
-	" ORDER BY state_block_nid, event_type_nid, event_state_key_nid"
-
-type stateBlockStatements struct {
-	db                                      *sql.DB
-	insertStateDataStmt                     *sql.Stmt
-	selectNextStateBlockNIDStmt             *sql.Stmt
-	bulkSelectStateBlockEntriesStmt         *sql.Stmt
-	bulkSelectFilteredStateBlockEntriesStmt *sql.Stmt
-}
-
-func NewSqliteStateBlockTable(db *sql.DB) (tables.StateBlock, error) {
-	s := &stateBlockStatements{
-		db: db,
-	}
-	_, err := db.Exec(stateDataSchema)
-	if err != nil {
-		return nil, err
-	}
-
-	return s, shared.StatementList{
-		{&s.insertStateDataStmt, insertStateDataSQL},
-		{&s.selectNextStateBlockNIDStmt, selectNextStateBlockNIDSQL},
-		{&s.bulkSelectStateBlockEntriesStmt, bulkSelectStateBlockEntriesSQL},
-		{&s.bulkSelectFilteredStateBlockEntriesStmt, bulkSelectFilteredStateBlockEntriesSQL},
-	}.Prepare(db)
-}
-
-func (s *stateBlockStatements) BulkInsertStateData(
-	ctx context.Context, txn *sql.Tx,
-	entries []types.StateEntry,
-) (types.StateBlockNID, error) {
-	if len(entries) == 0 {
-		return 0, nil
-	}
-	var stateBlockNID types.StateBlockNID
-	err := sqlutil.TxStmt(txn, s.selectNextStateBlockNIDStmt).QueryRowContext(ctx).Scan(&stateBlockNID)
-	if err != nil {
-		return 0, err
-	}
-	for _, entry := range entries {
-		_, err = sqlutil.TxStmt(txn, s.insertStateDataStmt).ExecContext(
-			ctx,
-			int64(stateBlockNID),
-			int64(entry.EventTypeNID),
-			int64(entry.EventStateKeyNID),
-			int64(entry.EventNID),
-		)
-		if err != nil {
-			return 0, err
-		}
-	}
-	return stateBlockNID, err
-}
-
-func (s *stateBlockStatements) BulkSelectStateBlockEntries(
-	ctx context.Context, stateBlockNIDs []types.StateBlockNID,
-) ([]types.StateEntryList, error) {
-	nids := make([]interface{}, len(stateBlockNIDs))
-	for k, v := range stateBlockNIDs {
-		nids[k] = v
-	}
-	selectOrig := strings.Replace(bulkSelectStateBlockEntriesSQL, "($1)", sqlutil.QueryVariadic(len(nids)), 1)
-	selectStmt, err := s.db.Prepare(selectOrig)
-	if err != nil {
-		return nil, err
-	}
-	rows, err := selectStmt.QueryContext(ctx, nids...)
-	if err != nil {
-		return nil, err
-	}
-	defer internal.CloseAndLogIfError(ctx, rows, "bulkSelectStateBlockEntries: rows.close() failed")
-
-	results := make([]types.StateEntryList, len(stateBlockNIDs))
-	// current is a pointer to the StateEntryList to append the state entries to.
-	var current *types.StateEntryList
-	i := 0
-	for rows.Next() {
-		var (
-			stateBlockNID    int64
-			eventTypeNID     int64
-			eventStateKeyNID int64
-			eventNID         int64
-			entry            types.StateEntry
-		)
-		if err := rows.Scan(
-			&stateBlockNID, &eventTypeNID, &eventStateKeyNID, &eventNID,
-		); err != nil {
-			return nil, err
-		}
-		entry.EventTypeNID = types.EventTypeNID(eventTypeNID)
-		entry.EventStateKeyNID = types.EventStateKeyNID(eventStateKeyNID)
-		entry.EventNID = types.EventNID(eventNID)
-		if current == nil || types.StateBlockNID(stateBlockNID) != current.StateBlockNID {
-			// The state entry row is for a different state data block to the current one.
-			// So we start appending to the next entry in the list.
-			current = &results[i]
-			current.StateBlockNID = types.StateBlockNID(stateBlockNID)
-			i++
-		}
-		current.StateEntries = append(current.StateEntries, entry)
-	}
-	if i != len(nids) {
-		return nil, fmt.Errorf("storage: state data NIDs missing from the database (%d != %d)", i, len(nids))
-	}
-	return results, nil
-}
-
-func (s *stateBlockStatements) BulkSelectFilteredStateBlockEntries(
-	ctx context.Context,
-	stateBlockNIDs []types.StateBlockNID,
-	stateKeyTuples []types.StateKeyTuple,
-) ([]types.StateEntryList, error) {
-	tuples := stateKeyTupleSorter(stateKeyTuples)
-	// Sort the tuples so that we can run binary search against them as we filter the rows returned by the db.
-	sort.Sort(tuples)
-
-	eventTypeNIDArray, eventStateKeyNIDArray := tuples.typesAndStateKeysAsArrays()
-	sqlStatement := strings.Replace(bulkSelectFilteredStateBlockEntriesSQL, "($1)", sqlutil.QueryVariadic(len(stateBlockNIDs)), 1)
-	sqlStatement = strings.Replace(sqlStatement, "($2)", sqlutil.QueryVariadicOffset(len(eventTypeNIDArray), len(stateBlockNIDs)), 1)
-	sqlStatement = strings.Replace(sqlStatement, "($3)", sqlutil.QueryVariadicOffset(len(eventStateKeyNIDArray), len(stateBlockNIDs)+len(eventTypeNIDArray)), 1)
-
-	var params []interface{}
-	for _, val := range stateBlockNIDs {
-		params = append(params, int64(val))
-	}
-	for _, val := range eventTypeNIDArray {
-		params = append(params, val)
-	}
-	for _, val := range eventStateKeyNIDArray {
-		params = append(params, val)
-	}
-
-	rows, err := s.db.QueryContext(
-		ctx,
-		sqlStatement,
-		params...,
-	)
-	if err != nil {
-		return nil, err
-	}
-	defer internal.CloseAndLogIfError(ctx, rows, "bulkSelectFilteredStateBlockEntries: rows.close() failed")
-
-	var results []types.StateEntryList
-	var current types.StateEntryList
-	for rows.Next() {
-		var (
-			stateBlockNID    int64
-			eventTypeNID     int64
-			eventStateKeyNID int64
-			eventNID         int64
-			entry            types.StateEntry
-		)
-		if err := rows.Scan(
-			&stateBlockNID, &eventTypeNID, &eventStateKeyNID, &eventNID,
-		); err != nil {
-			return nil, err
-		}
-		entry.EventTypeNID = types.EventTypeNID(eventTypeNID)
-		entry.EventStateKeyNID = types.EventStateKeyNID(eventStateKeyNID)
-		entry.EventNID = types.EventNID(eventNID)
-
-		// We can use binary search here because we sorted the tuples earlier
-		if !tuples.contains(entry.StateKeyTuple) {
-			// The select will return the cross product of types and state keys.
-			// So we need to check if type of the entry is in the list.
-			continue
-		}
-
-		if types.StateBlockNID(stateBlockNID) != current.StateBlockNID {
-			// The state entry row is for a different state data block to the current one.
-			// So we append the current entry to the results and start adding to a new one.
-			// The first time through the loop current will be empty.
-			if current.StateEntries != nil {
-				results = append(results, current)
-			}
-			current = types.StateEntryList{StateBlockNID: types.StateBlockNID(stateBlockNID)}
-		}
-		current.StateEntries = append(current.StateEntries, entry)
-	}
-	// Add the last entry to the list if it is not empty.
-	if current.StateEntries != nil {
-		results = append(results, current)
-	}
-	return results, nil
-}
-
-type stateKeyTupleSorter []types.StateKeyTuple
-
-func (s stateKeyTupleSorter) Len() int           { return len(s) }
-func (s stateKeyTupleSorter) Less(i, j int) bool { return s[i].LessThan(s[j]) }
-func (s stateKeyTupleSorter) Swap(i, j int)      { s[i], s[j] = s[j], s[i] }
-
-// Check whether a tuple is in the list. Assumes that the list is sorted.
-func (s stateKeyTupleSorter) contains(value types.StateKeyTuple) bool {
-	i := sort.Search(len(s), func(i int) bool { return !s[i].LessThan(value) })
-	return i < len(s) && s[i] == value
-}
-
-// List the unique eventTypeNIDs and eventStateKeyNIDs.
-// Assumes that the list is sorted.
-func (s stateKeyTupleSorter) typesAndStateKeysAsArrays() (eventTypeNIDs []int64, eventStateKeyNIDs []int64) {
-	eventTypeNIDs = make([]int64, len(s))
-	eventStateKeyNIDs = make([]int64, len(s))
-	for i := range s {
-		eventTypeNIDs[i] = int64(s[i].EventTypeNID)
-		eventStateKeyNIDs[i] = int64(s[i].EventStateKeyNID)
-	}
-	eventTypeNIDs = eventTypeNIDs[:util.SortAndUnique(int64Sorter(eventTypeNIDs))]
-	eventStateKeyNIDs = eventStateKeyNIDs[:util.SortAndUnique(int64Sorter(eventStateKeyNIDs))]
-	return
-}
-
-type int64Sorter []int64
-
-func (s int64Sorter) Len() int           { return len(s) }
-func (s int64Sorter) Less(i, j int) bool { return s[i] < s[j] }
-func (s int64Sorter) Swap(i, j int)      { s[i], s[j] = s[j], s[i] }

roomserver/storage/sqlite3/state_block_table_test.go

@@ -1,86 +0,0 @@
-// Copyright 2017-2018 New Vector Ltd
-// Copyright 2019-2020 The Matrix.org Foundation C.I.C.
-//
-// Licensed under the Apache License, Version 2.0 (the "License");
-// you may not use this file except in compliance with the License.
-// You may obtain a copy of the License at
-//
-//     http://www.apache.org/licenses/LICENSE-2.0
-//
-// Unless required by applicable law or agreed to in writing, software
-// distributed under the License is distributed on an "AS IS" BASIS,
-// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-// See the License for the specific language governing permissions and
-// limitations under the License.
-
-package sqlite3
-
-import (
-	"sort"
-	"testing"
-
-	"github.com/matrix-org/dendrite/roomserver/types"
-)
-
-func TestStateKeyTupleSorter(t *testing.T) {
-	input := stateKeyTupleSorter{
-		{EventTypeNID: 1, EventStateKeyNID: 2},
-		{EventTypeNID: 1, EventStateKeyNID: 4},
-		{EventTypeNID: 2, EventStateKeyNID: 2},
-		{EventTypeNID: 1, EventStateKeyNID: 1},
-	}
-	want := []types.StateKeyTuple{
-		{EventTypeNID: 1, EventStateKeyNID: 1},
-		{EventTypeNID: 1, EventStateKeyNID: 2},
-		{EventTypeNID: 1, EventStateKeyNID: 4},
-		{EventTypeNID: 2, EventStateKeyNID: 2},
-	}
-	doNotWant := []types.StateKeyTuple{
-		{EventTypeNID: 0, EventStateKeyNID: 0},
-		{EventTypeNID: 1, EventStateKeyNID: 3},
-		{EventTypeNID: 2, EventStateKeyNID: 1},
-		{EventTypeNID: 3, EventStateKeyNID: 1},
-	}
-	wantTypeNIDs := []int64{1, 2}
-	wantStateKeyNIDs := []int64{1, 2, 4}
-
-	// Sort the input and check it's in the right order.
-	sort.Sort(input)
-	gotTypeNIDs, gotStateKeyNIDs := input.typesAndStateKeysAsArrays()
-
-	for i := range want {
-		if input[i] != want[i] {
-			t.Errorf("Wanted %#v at index %d got %#v", want[i], i, input[i])
-		}
-
-		if !input.contains(want[i]) {
-			t.Errorf("Wanted %#v.contains(%#v) to be true but got false", input, want[i])
-		}
-	}
-
-	for i := range doNotWant {
-		if input.contains(doNotWant[i]) {
-			t.Errorf("Wanted %#v.contains(%#v) to be false but got true", input, doNotWant[i])
-		}
-	}
-
-	if len(wantTypeNIDs) != len(gotTypeNIDs) {
-		t.Fatalf("Wanted type NIDs %#v got %#v", wantTypeNIDs, gotTypeNIDs)
-	}
-
-	for i := range wantTypeNIDs {
-		if wantTypeNIDs[i] != gotTypeNIDs[i] {
-			t.Fatalf("Wanted type NIDs %#v got %#v", wantTypeNIDs, gotTypeNIDs)
-		}
-	}
-
-	if len(wantStateKeyNIDs) != len(gotStateKeyNIDs) {
-		t.Fatalf("Wanted state key NIDs %#v got %#v", wantStateKeyNIDs, gotStateKeyNIDs)
-	}
-
-	for i := range wantStateKeyNIDs {
-		if wantStateKeyNIDs[i] != gotStateKeyNIDs[i] {
-			t.Fatalf("Wanted type NIDs %#v got %#v", wantTypeNIDs, gotTypeNIDs)
-		}
-	}
-}

roomserver/storage/sqlite3/state_snapshot_table.go

@@ -1,126 +0,0 @@
-// Copyright 2017-2018 New Vector Ltd
-// Copyright 2019-2020 The Matrix.org Foundation C.I.C.
-//
-// Licensed under the Apache License, Version 2.0 (the "License");
-// you may not use this file except in compliance with the License.
-// You may obtain a copy of the License at
-//
-//     http://www.apache.org/licenses/LICENSE-2.0
-//
-// Unless required by applicable law or agreed to in writing, software
-// distributed under the License is distributed on an "AS IS" BASIS,
-// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-// See the License for the specific language governing permissions and
-// limitations under the License.
-
-package sqlite3
-
-import (
-	"context"
-	"database/sql"
-	"encoding/json"
-	"fmt"
-	"strings"
-
-	"github.com/matrix-org/dendrite/internal"
-	"github.com/matrix-org/dendrite/internal/sqlutil"
-	"github.com/matrix-org/dendrite/roomserver/storage/shared"
-	"github.com/matrix-org/dendrite/roomserver/storage/tables"
-	"github.com/matrix-org/dendrite/roomserver/types"
-)
-
-const stateSnapshotSchema = `
-  CREATE TABLE IF NOT EXISTS roomserver_state_snapshots (
-    state_snapshot_nid INTEGER PRIMARY KEY AUTOINCREMENT,
-    room_nid INTEGER NOT NULL,
-    state_block_nids TEXT NOT NULL DEFAULT '[]'
-  );
-`
-
-const insertStateSQL = `
-	INSERT INTO roomserver_state_snapshots (room_nid, state_block_nids)
-	  VALUES ($1, $2);`
-
-// Bulk state data NID lookup.
-// Sorting by state_snapshot_nid means we can use binary search over the result
-// to lookup the state data NIDs for a state snapshot NID.
-const bulkSelectStateBlockNIDsSQL = "" +
-	"SELECT state_snapshot_nid, state_block_nids FROM roomserver_state_snapshots" +
-	" WHERE state_snapshot_nid IN ($1) ORDER BY state_snapshot_nid ASC"
-
-type stateSnapshotStatements struct {
-	db                           *sql.DB
-	insertStateStmt              *sql.Stmt
-	bulkSelectStateBlockNIDsStmt *sql.Stmt
-}
-
-func NewSqliteStateSnapshotTable(db *sql.DB) (tables.StateSnapshot, error) {
-	s := &stateSnapshotStatements{
-		db: db,
-	}
-	_, err := db.Exec(stateSnapshotSchema)
-	if err != nil {
-		return nil, err
-	}
-
-	return s, shared.StatementList{
-		{&s.insertStateStmt, insertStateSQL},
-		{&s.bulkSelectStateBlockNIDsStmt, bulkSelectStateBlockNIDsSQL},
-	}.Prepare(db)
-}
-
-func (s *stateSnapshotStatements) InsertState(
-	ctx context.Context, txn *sql.Tx, roomNID types.RoomNID, stateBlockNIDs []types.StateBlockNID,
-) (stateNID types.StateSnapshotNID, err error) {
-	stateBlockNIDsJSON, err := json.Marshal(stateBlockNIDs)
-	if err != nil {
-		return
-	}
-	insertStmt := sqlutil.TxStmt(txn, s.insertStateStmt)
-	res, err := insertStmt.ExecContext(ctx, int64(roomNID), string(stateBlockNIDsJSON))
-	if err != nil {
-		return 0, err
-	}
-	lastRowID, err := res.LastInsertId()
-	if err != nil {
-		return 0, err
-	}
-	stateNID = types.StateSnapshotNID(lastRowID)
-	return
-}
-
-func (s *stateSnapshotStatements) BulkSelectStateBlockNIDs(
-	ctx context.Context, stateNIDs []types.StateSnapshotNID,
-) ([]types.StateBlockNIDList, error) {
-	nids := make([]interface{}, len(stateNIDs))
-	for k, v := range stateNIDs {
-		nids[k] = v
-	}
-	selectOrig := strings.Replace(bulkSelectStateBlockNIDsSQL, "($1)", sqlutil.QueryVariadic(len(nids)), 1)
-	selectStmt, err := s.db.Prepare(selectOrig)
-	if err != nil {
-		return nil, err
-	}
-
-	rows, err := selectStmt.QueryContext(ctx, nids...)
-	if err != nil {
-		return nil, err
-	}
-	defer internal.CloseAndLogIfError(ctx, rows, "bulkSelectStateBlockNIDs: rows.close() failed")
-	results := make([]types.StateBlockNIDList, len(stateNIDs))
-	i := 0
-	for ; rows.Next(); i++ {
-		result := &results[i]
-		var stateBlockNIDsJSON string
-		if err := rows.Scan(&result.StateSnapshotNID, &stateBlockNIDsJSON); err != nil {
-			return nil, err
-		}
-		if err := json.Unmarshal([]byte(stateBlockNIDsJSON), &result.StateBlockNIDs); err != nil {
-			return nil, err
-		}
-	}
-	if i != len(stateNIDs) {
-		return nil, fmt.Errorf("storage: state NIDs missing from the database (%d != %d)", i, len(stateNIDs))
-	}
-	return results, nil
-}

roomserver/storage/sqlite3/state_table.go

@@ -0,0 +1,132 @@
+// Copyright 2017-2018 New Vector Ltd
+// Copyright 2019-2020 The Matrix.org Foundation C.I.C.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package sqlite3
+
+import (
+	"context"
+	"database/sql"
+	"encoding/json"
+	"fmt"
+	"strings"
+
+	"github.com/matrix-org/dendrite/internal"
+	"github.com/matrix-org/dendrite/internal/sqlutil"
+	"github.com/matrix-org/dendrite/roomserver/storage/shared"
+	"github.com/matrix-org/dendrite/roomserver/storage/tables"
+	"github.com/matrix-org/dendrite/roomserver/types"
+)
+
+const stateSchema = `
+CREATE TABLE IF NOT EXISTS roomserver_state (
+    state_nid INTEGER PRIMARY KEY AUTOINCREMENT,
+	room_nid INTEGER NOT NULL,
+    event_nids TEXT NOT NULL,
+    UNIQUE (room_nid, event_nids),
+	CONSTRAINT fk_room_id FOREIGN KEY(room_nid) REFERENCES roomserver_rooms(room_nid)
+);
+`
+
+const insertNewStateSnapshotSQL = "" +
+	"INSERT INTO roomserver_state (room_nid, event_nids)" +
+	" VALUES ($1, $2)" +
+	" ON CONFLICT (room_nid, event_nids) DO UPDATE SET room_nid = $1" +
+	" RETURNING state_nid"
+
+const bulkSelectNewStateSnapshotSQL = "" +
+	"SELECT state_nid, event_nids" +
+	" FROM roomserver_state WHERE state_nid IN ($1)" +
+	" ORDER BY state_nid"
+
+type stateStatements struct {
+	db                  *sql.DB
+	insertStateStmt     *sql.Stmt
+	bulkSelectStateStmt *sql.Stmt
+}
+
+func NewPostgresStateTable(db *sql.DB) (tables.State, error) {
+	s := &stateStatements{db: db}
+	_, err := db.Exec(stateSchema)
+	if err != nil {
+		return nil, err
+	}
+
+	return s, shared.StatementList{
+		{&s.insertStateStmt, insertNewStateSnapshotSQL},
+		{&s.bulkSelectStateStmt, bulkSelectNewStateSnapshotSQL},
+	}.Prepare(db)
+}
+
+func (s *stateStatements) InsertState(
+	ctx context.Context,
+	txn *sql.Tx,
+	roomNID types.RoomNID,
+	eventNIDs []types.EventNID,
+) (types.StateSnapshotNID, error) {
+	stmt := sqlutil.TxStmt(txn, s.insertStateStmt)
+	value, err := json.Marshal(types.DeduplicateEventNIDs(eventNIDs))
+	if err != nil {
+		return 0, fmt.Errorf("json.Marshal: %w", err)
+	}
+	var id int64
+	if err = stmt.QueryRowContext(ctx, int64(roomNID), value).Scan(&id); err != nil {
+		return 0, fmt.Errorf("stmt.ExecContext: %w", err)
+	}
+	return types.StateSnapshotNID(id), nil
+}
+
+func (s *stateStatements) BulkSelectState(
+	ctx context.Context, stateNIDs []types.StateSnapshotNID,
+) (map[types.StateSnapshotNID][]types.EventNID, error) {
+	selectOrig := strings.Replace(bulkSelectNewStateSnapshotSQL, "($1)", sqlutil.QueryVariadic(len(stateNIDs)), 1)
+	selectStmt, err := s.db.Prepare(selectOrig)
+	if err != nil {
+		return nil, err
+	}
+	nids := make([]interface{}, len(stateNIDs))
+	for i := range stateNIDs {
+		nids[i] = int64(stateNIDs[i])
+	}
+	rows, err := selectStmt.QueryContext(ctx, nids...)
+	if err != nil {
+		return nil, err
+	}
+	defer internal.CloseAndLogIfError(ctx, rows, "bulkSelectStateBlockEntries: rows.close() failed")
+	results := map[types.StateSnapshotNID][]types.EventNID{}
+	for rows.Next() {
+		var stateNID int64
+		var eventNIDJSON json.RawMessage
+		if err = rows.Scan(&stateNID, &eventNIDJSON); err != nil {
+			return nil, fmt.Errorf("rows.Scan: %w", err)
+		}
+		var eventNIDs []int64
+		if err = json.Unmarshal(eventNIDJSON, &eventNIDs); err != nil {
+			return nil, fmt.Errorf("json.Unmarshal: %w", err)
+		}
+		for _, id := range eventNIDs {
+			results[types.StateSnapshotNID(stateNID)] = append(
+				results[types.StateSnapshotNID(stateNID)],
+				types.EventNID(id),
+			)
+		}
+	}
+	if err = rows.Err(); err != nil {
+		return nil, fmt.Errorf("rows.Err: %w", err)
+	}
+	if len(results) != len(stateNIDs) {
+		return nil, fmt.Errorf("storage: state data NIDs missing from the database (%d != %d)", len(results), len(stateNIDs))
+	}
+	return results, err
+}

roomserver/storage/sqlite3/storage.go

@@ -98,11 +98,17 @@ func (d *Database) prepare(db *sql.DB, cache caching.RoomServerCaches) error {
 	if err != nil {
 		return err
 	}
-	stateBlock, err := NewSqliteStateBlockTable(db)
+	/*
-	if err != nil {
+		stateBlock, err := NewSqliteStateBlockTable(db)
-		return err
+		if err != nil {
-	}
+			return err
-	stateSnapshot, err := NewSqliteStateSnapshotTable(db)
+		}
+		stateSnapshot, err := NewSqliteStateSnapshotTable(db)
+		if err != nil {
+			return err
+		}
+	*/
+	state, err := NewPostgresStateTable(db)
 	if err != nil {
 		return err
 	}
@@ -131,17 +137,18 @@ func (d *Database) prepare(db *sql.DB, cache caching.RoomServerCaches) error {
 		return err
 	}
 	d.Database = shared.Database{
-		DB:                         db,
+		DB:                  db,
-		Cache:                      cache,
+		Cache:               cache,
-		Writer:                     sqlutil.NewExclusiveWriter(),
+		Writer:              sqlutil.NewExclusiveWriter(),
-		EventsTable:                events,
+		EventsTable:         events,
-		EventTypesTable:            eventTypes,
+		EventTypesTable:     eventTypes,
-		EventStateKeysTable:        eventStateKeys,
+		EventStateKeysTable: eventStateKeys,
-		EventJSONTable:             eventJSON,
+		EventJSONTable:      eventJSON,
-		RoomsTable:                 rooms,
+		RoomsTable:          rooms,
-		TransactionsTable:          transactions,
+		TransactionsTable:   transactions,
-		StateBlockTable:            stateBlock,
+		StateTable:          state,
-		StateSnapshotTable:         stateSnapshot,
+		//	StateBlockTable:            stateBlock,
+		//	StateSnapshotTable:         stateSnapshot,
 		PrevEventsTable:            prevEvents,
 		RoomAliasesTable:           roomAliases,
 		InvitesTable:               invites,

roomserver/storage/tables/interface.go

@@ -43,6 +43,7 @@ type Events interface {
 	// bulkSelectStateEventByID lookups a list of state events by event ID.
 	// If any of the requested events are missing from the database it returns a types.MissingEventError
 	BulkSelectStateEventByID(ctx context.Context, eventIDs []string) ([]types.StateEntry, error)
+	BulkSelectStateEventByNID(ctx context.Context, eventNIDs []types.EventNID) ([]types.StateEntry, error)
 	// BulkSelectStateAtEventByID lookups the state at a list of events by event ID.
 	// If any of the requested events are missing from the database it returns a types.MissingEventError.
 	// If we do not have the state for any of the requested events it returns a types.MissingEventError.
@@ -80,6 +81,12 @@ type Transactions interface {
 	SelectTransactionEventID(ctx context.Context, transactionID string, sessionID int64, userID string) (eventID string, err error)
 }
 
+type State interface {
+	InsertState(ctx context.Context, txn *sql.Tx, roomNID types.RoomNID, eventNIDs []types.EventNID) (types.StateSnapshotNID, error)
+	BulkSelectState(ctx context.Context, stateNIDs []types.StateSnapshotNID) (map[types.StateSnapshotNID][]types.EventNID, error)
+}
+
+/*
 type StateSnapshot interface {
 	InsertState(ctx context.Context, txn *sql.Tx, roomNID types.RoomNID, stateBlockNIDs []types.StateBlockNID) (stateNID types.StateSnapshotNID, err error)
 	BulkSelectStateBlockNIDs(ctx context.Context, stateNIDs []types.StateSnapshotNID) ([]types.StateBlockNIDList, error)
@@ -90,6 +97,7 @@ type StateBlock interface {
 	BulkSelectStateBlockEntries(ctx context.Context, stateBlockNIDs []types.StateBlockNID) ([]types.StateEntryList, error)
 	BulkSelectFilteredStateBlockEntries(ctx context.Context, stateBlockNIDs []types.StateBlockNID, stateKeyTuples []types.StateKeyTuple) ([]types.StateEntryList, error)
 }
+*/
 
 type RoomAliases interface {
 	InsertRoomAlias(ctx context.Context, txn *sql.Tx, alias string, roomID string, creatorUserID string) (err error)

roomserver/types/types.go

@@ -74,6 +74,24 @@ func (a StateEntry) LessThan(b StateEntry) bool {
 	return a.EventNID < b.EventNID
 }
 
+// Deduplicate takes a set of event NIDs and ensures that there are no
+// duplicates. If there are then we dedupe them.
+func DeduplicateEventNIDs(a []EventNID) []EventNID {
+	if len(a) < 2 {
+		return a
+	}
+	sort.SliceStable(a, func(i, j int) bool {
+		return a[i] < a[j]
+	})
+	for i := 0; i < len(a)-1; i++ {
+		if a[i] == a[i+1] {
+			a = append(a[:i], a[i+1:]...)
+			i--
+		}
+	}
+	return a
+}
+
 // Deduplicate takes a set of state entries and ensures that there are no
 // duplicate (event type, state key) tuples. If there are then we dedupe
 // them, making sure that the latest/highest NIDs are always chosen.
@@ -151,18 +169,6 @@ const (
 	EmptyStateKeyNID = 1
 )
 
-// StateBlockNIDList is used to return the result of bulk StateBlockNID lookups from the database.
-type StateBlockNIDList struct {
-	StateSnapshotNID StateSnapshotNID
-	StateBlockNIDs   []StateBlockNID
-}
-
-// StateEntryList is used to return the result of bulk state entry lookups from the database.
-type StateEntryList struct {
-	StateBlockNID StateBlockNID
-	StateEntries  []StateEntry
-}
-
 // A MissingEventError is an error that happened because the roomserver was
 // missing requested events from its database.
 type MissingEventError string