Implement storage interfaces (#841)

* Implement interfaces for federationsender storage

* Implement interfaces for mediaapi storage

* Implement interfaces for publicroomsapi storage

* Implement interfaces for roomserver storage

* Implement interfaces for syncapi storage

* Implement interfaces for keydb storage

* common.PartitionStorer in publicroomsapi interface

* Update copyright notices

60 files changed, 1599 insertions, 1228 deletions

diff --git a/common/basecomponent/base.go b/common/basecomponent/base.go
index b05ec42d..50fc2d5c 100644
--- a/common/basecomponent/base.go
+++ b/common/basecomponent/base.go
@@ -138,7 +138,7 @@ func (b *BaseDendrite) CreateAccountsDB() *accounts.Database {
 
 // CreateKeyDB creates a new instance of the key database. Should only be called
 // once per component.
-func (b *BaseDendrite) CreateKeyDB() *keydb.Database {
+func (b *BaseDendrite) CreateKeyDB() keydb.Database {
 	db, err := keydb.NewDatabase(string(b.Cfg.Database.ServerKey))
 	if err != nil {
 		logrus.WithError(err).Panicf("failed to connect to keys db")
diff --git a/common/keydb/keydb.go b/common/keydb/keydb.go
index 9e8b6a6f..b9fa884e 100644
--- a/common/keydb/keydb.go
+++ b/common/keydb/keydb.go
@@ -1,4 +1,4 @@
-// Copyright 2017 Vector Creations Ltd
+// Copyright 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.
@@ -16,67 +16,29 @@ package keydb
 
 import (
 	"context"
-	"database/sql"
+	"errors"
+	"net/url"
 
+	"github.com/matrix-org/dendrite/common/keydb/postgres"
 	"github.com/matrix-org/gomatrixserverlib"
 )
 
-// A Database implements gomatrixserverlib.KeyDatabase and is used to store
-// the public keys for other matrix servers.
-type Database struct {
-	statements serverKeyStatements
+type Database interface {
+	FetcherName() string
+	FetchKeys(ctx context.Context, requests map[gomatrixserverlib.PublicKeyLookupRequest]gomatrixserverlib.Timestamp) (map[gomatrixserverlib.PublicKeyLookupRequest]gomatrixserverlib.PublicKeyLookupResult, error)
+	StoreKeys(ctx context.Context, keyMap map[gomatrixserverlib.PublicKeyLookupRequest]gomatrixserverlib.PublicKeyLookupResult) error
 }
 
-// NewDatabase prepares a new key database.
-// It creates the necessary tables if they don't already exist.
-// It prepares all the SQL statements that it will use.
-// Returns an error if there was a problem talking to the database.
-func NewDatabase(dataSourceName string) (*Database, error) {
-	db, err := sql.Open("postgres", dataSourceName)
+// NewDatabase opens a database connection.
+func NewDatabase(dataSourceName string) (Database, error) {
+	uri, err := url.Parse(dataSourceName)
 	if err != nil {
 		return nil, err
 	}
-	d := &Database{}
-	err = d.statements.prepare(db)
-	if err != nil {
-		return nil, err
-	}
-	return d, nil
-}
-
-// FetcherName implements KeyFetcher
-func (d Database) FetcherName() string {
-	return "KeyDatabase"
-}
-
-// FetchKeys implements gomatrixserverlib.KeyDatabase
-func (d *Database) FetchKeys(
-	ctx context.Context,
-	requests map[gomatrixserverlib.PublicKeyLookupRequest]gomatrixserverlib.Timestamp,
-) (map[gomatrixserverlib.PublicKeyLookupRequest]gomatrixserverlib.PublicKeyLookupResult, error) {
-	return d.statements.bulkSelectServerKeys(ctx, requests)
-}
-
-// StoreKeys implements gomatrixserverlib.KeyDatabase
-func (d *Database) StoreKeys(
-	ctx context.Context,
-	keyMap map[gomatrixserverlib.PublicKeyLookupRequest]gomatrixserverlib.PublicKeyLookupResult,
-) error {
-	// TODO: Inserting all the keys within a single transaction may
-	// be more efficient since the transaction overhead can be quite
-	// high for a single insert statement.
-	var lastErr error
-	for request, keys := range keyMap {
-		if err := d.statements.upsertServerKeys(ctx, request, keys); err != nil {
-			// Rather than returning immediately on error we try to insert the
-			// remaining keys.
-			// Since we are inserting the keys outside of a transaction it is
-			// possible for some of the inserts to succeed even though some
-			// of the inserts have failed.
-			// Ensuring that we always insert all the keys we can means that
-			// this behaviour won't depend on the iteration order of the map.
-			lastErr = err
-		}
+	switch uri.Scheme {
+	case "postgres":
+		return postgres.NewDatabase(dataSourceName)
+	default:
+		return nil, errors.New("unknown schema")
 	}
-	return lastErr
 }
diff --git a/common/keydb/postgres/keydb.go b/common/keydb/postgres/keydb.go
new file mode 100644
index 00000000..bf0ff69c
--- /dev/null
+++ b/common/keydb/postgres/keydb.go
@@ -0,0 +1,83 @@
+// 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"
+
+	"github.com/matrix-org/gomatrixserverlib"
+)
+
+// A Database implements gomatrixserverlib.KeyDatabase and is used to store
+// the public keys for other matrix servers.
+type Database struct {
+	statements serverKeyStatements
+}
+
+// NewDatabase prepares a new key database.
+// It creates the necessary tables if they don't already exist.
+// It prepares all the SQL statements that it will use.
+// Returns an error if there was a problem talking to the database.
+func NewDatabase(dataSourceName string) (*Database, error) {
+	db, err := sql.Open("postgres", dataSourceName)
+	if err != nil {
+		return nil, err
+	}
+	d := &Database{}
+	err = d.statements.prepare(db)
+	if err != nil {
+		return nil, err
+	}
+	return d, nil
+}
+
+// FetcherName implements KeyFetcher
+func (d Database) FetcherName() string {
+	return "KeyDatabase"
+}
+
+// FetchKeys implements gomatrixserverlib.KeyDatabase
+func (d *Database) FetchKeys(
+	ctx context.Context,
+	requests map[gomatrixserverlib.PublicKeyLookupRequest]gomatrixserverlib.Timestamp,
+) (map[gomatrixserverlib.PublicKeyLookupRequest]gomatrixserverlib.PublicKeyLookupResult, error) {
+	return d.statements.bulkSelectServerKeys(ctx, requests)
+}
+
+// StoreKeys implements gomatrixserverlib.KeyDatabase
+func (d *Database) StoreKeys(
+	ctx context.Context,
+	keyMap map[gomatrixserverlib.PublicKeyLookupRequest]gomatrixserverlib.PublicKeyLookupResult,
+) error {
+	// TODO: Inserting all the keys within a single transaction may
+	// be more efficient since the transaction overhead can be quite
+	// high for a single insert statement.
+	var lastErr error
+	for request, keys := range keyMap {
+		if err := d.statements.upsertServerKeys(ctx, request, keys); err != nil {
+			// Rather than returning immediately on error we try to insert the
+			// remaining keys.
+			// Since we are inserting the keys outside of a transaction it is
+			// possible for some of the inserts to succeed even though some
+			// of the inserts have failed.
+			// Ensuring that we always insert all the keys we can means that
+			// this behaviour won't depend on the iteration order of the map.
+			lastErr = err
+		}
+	}
+	return lastErr
+}
diff --git a/common/keydb/server_key_table.go b/common/keydb/postgres/server_key_table.go
index c922fa98..8fb9a0ee 100644
--- a/common/keydb/server_key_table.go
+++ b/common/keydb/postgres/server_key_table.go
@@ -1,4 +1,5 @@
-// Copyright 2017 Vector Creations Ltd
+// 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.
@@ -12,7 +13,7 @@
 // See the License for the specific language governing permissions and
 // limitations under the License.
 
-package keydb
+package postgres
 
 import (
 	"context"
diff --git a/federationsender/consumers/roomserver.go b/federationsender/consumers/roomserver.go
index 3ba978b1..4568f44d 100644
--- a/federationsender/consumers/roomserver.go
+++ b/federationsender/consumers/roomserver.go
@@ -33,7 +33,7 @@ import (
 // OutputRoomEventConsumer consumes events that originated in the room server.
 type OutputRoomEventConsumer struct {
 	roomServerConsumer *common.ContinualConsumer
-	db                 *storage.Database
+	db                 storage.Database
 	queues             *queue.OutgoingQueues
 	query              api.RoomserverQueryAPI
 }
@@ -43,7 +43,7 @@ func NewOutputRoomEventConsumer(
 	cfg *config.Dendrite,
 	kafkaConsumer sarama.Consumer,
 	queues *queue.OutgoingQueues,
-	store *storage.Database,
+	store storage.Database,
 	queryAPI api.RoomserverQueryAPI,
 ) *OutputRoomEventConsumer {
 	consumer := common.ContinualConsumer{
diff --git a/federationsender/consumers/typingserver.go b/federationsender/consumers/typingserver.go
index c4cd0e59..590fcb25 100644
--- a/federationsender/consumers/typingserver.go
+++ b/federationsender/consumers/typingserver.go
@@ -29,7 +29,7 @@ import (
 // OutputTypingEventConsumer consumes events that originate in typing server.
 type OutputTypingEventConsumer struct {
 	consumer   *common.ContinualConsumer
-	db         *storage.Database
+	db         storage.Database
 	queues     *queue.OutgoingQueues
 	ServerName gomatrixserverlib.ServerName
 }
@@ -39,7 +39,7 @@ func NewOutputTypingEventConsumer(
 	cfg *config.Dendrite,
 	kafkaConsumer sarama.Consumer,
 	queues *queue.OutgoingQueues,
-	store *storage.Database,
+	store storage.Database,
 ) *OutputTypingEventConsumer {
 	consumer := common.ContinualConsumer{
 		Topic:          string(cfg.Kafka.Topics.OutputTypingEvent),
diff --git a/federationsender/storage/joined_hosts_table.go b/federationsender/storage/postgres/joined_hosts_table.go
index 5d652a1a..bd580e3b 100644
--- a/federationsender/storage/joined_hosts_table.go
+++ b/federationsender/storage/postgres/joined_hosts_table.go
@@ -1,4 +1,5 @@
-// Copyright 2017 Vector Creations Ltd
+// 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.
@@ -12,7 +13,7 @@
 // See the License for the specific language governing permissions and
 // limitations under the License.
 
-package storage
+package postgres
 
 import (
 	"context"
diff --git a/federationsender/storage/room_table.go b/federationsender/storage/postgres/room_table.go
index bb52b707..a64424b4 100644
--- a/federationsender/storage/room_table.go
+++ b/federationsender/storage/postgres/room_table.go
@@ -1,4 +1,5 @@
-// Copyright 2017 Vector Creations Ltd
+// 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.
@@ -12,7 +13,7 @@
 // See the License for the specific language governing permissions and
 // limitations under the License.
 
-package storage
+package postgres
 
 import (
 	"context"
diff --git a/federationsender/storage/postgres/storage.go b/federationsender/storage/postgres/storage.go
new file mode 100644
index 00000000..c60f6dc5
--- /dev/null
+++ b/federationsender/storage/postgres/storage.go
@@ -0,0 +1,122 @@
+// 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"
+
+	"github.com/matrix-org/dendrite/common"
+	"github.com/matrix-org/dendrite/federationsender/types"
+)
+
+// Database stores information needed by the federation sender
+type Database struct {
+	joinedHostsStatements
+	roomStatements
+	common.PartitionOffsetStatements
+	db *sql.DB
+}
+
+// NewDatabase opens a new database
+func NewDatabase(dataSourceName string) (*Database, error) {
+	var result Database
+	var err error
+	if result.db, err = sql.Open("postgres", dataSourceName); err != nil {
+		return nil, err
+	}
+	if err = result.prepare(); err != nil {
+		return nil, err
+	}
+	return &result, nil
+}
+
+func (d *Database) prepare() error {
+	var err error
+
+	if err = d.joinedHostsStatements.prepare(d.db); err != nil {
+		return err
+	}
+
+	if err = d.roomStatements.prepare(d.db); err != nil {
+		return err
+	}
+
+	return d.PartitionOffsetStatements.Prepare(d.db, "federationsender")
+}
+
+// UpdateRoom updates the joined hosts for a room and returns what the joined
+// hosts were before the update, or nil if this was a duplicate message.
+// This is called when we receive a message from kafka, so we pass in
+// oldEventID and newEventID to check that we haven't missed any messages or
+// this isn't a duplicate message.
+func (d *Database) UpdateRoom(
+	ctx context.Context,
+	roomID, oldEventID, newEventID string,
+	addHosts []types.JoinedHost,
+	removeHosts []string,
+) (joinedHosts []types.JoinedHost, err error) {
+	err = common.WithTransaction(d.db, func(txn *sql.Tx) error {
+		err = d.insertRoom(ctx, txn, roomID)
+		if err != nil {
+			return err
+		}
+
+		lastSentEventID, err := d.selectRoomForUpdate(ctx, txn, roomID)
+		if err != nil {
+			return err
+		}
+
+		if lastSentEventID == newEventID {
+			// We've handled this message before, so let's just ignore it.
+			// We can only get a duplicate for the last message we processed,
+			// so its enough just to compare the newEventID with lastSentEventID
+			return nil
+		}
+
+		if lastSentEventID != oldEventID {
+			return types.EventIDMismatchError{
+				DatabaseID: lastSentEventID, RoomServerID: oldEventID,
+			}
+		}
+
+		joinedHosts, err = d.selectJoinedHostsWithTx(ctx, txn, roomID)
+		if err != nil {
+			return err
+		}
+
+		for _, add := range addHosts {
+			err = d.insertJoinedHosts(ctx, txn, roomID, add.MemberEventID, add.ServerName)
+			if err != nil {
+				return err
+			}
+		}
+		if err = d.deleteJoinedHosts(ctx, txn, removeHosts); err != nil {
+			return err
+		}
+		return d.updateRoom(ctx, txn, roomID, newEventID)
+	})
+	return
+}
+
+// GetJoinedHosts returns the currently joined hosts for room,
+// as known to federationserver.
+// Returns an error if something goes wrong.
+func (d *Database) GetJoinedHosts(
+	ctx context.Context, roomID string,
+) ([]types.JoinedHost, error) {
+	return d.selectJoinedHosts(ctx, roomID)
+}
diff --git a/federationsender/storage/storage.go b/federationsender/storage/storage.go
index 3a0f8775..8cffdbf1 100644
--- a/federationsender/storage/storage.go
+++ b/federationsender/storage/storage.go
@@ -1,4 +1,4 @@
-// Copyright 2017 Vector Creations Ltd
+// Copyright 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.
@@ -16,106 +16,30 @@ package storage
 
 import (
 	"context"
-	"database/sql"
+	"errors"
+	"net/url"
 
 	"github.com/matrix-org/dendrite/common"
+	"github.com/matrix-org/dendrite/federationsender/storage/postgres"
 	"github.com/matrix-org/dendrite/federationsender/types"
 )
 
-// Database stores information needed by the federation sender
-type Database struct {
-	joinedHostsStatements
-	roomStatements
-	common.PartitionOffsetStatements
-	db *sql.DB
+type Database interface {
+	common.PartitionStorer
+	UpdateRoom(ctx context.Context, roomID, oldEventID, newEventID string, addHosts []types.JoinedHost, removeHosts []string) (joinedHosts []types.JoinedHost, err error)
+	GetJoinedHosts(ctx context.Context, roomID string) ([]types.JoinedHost, error)
 }
 
 // NewDatabase opens a new database
-func NewDatabase(dataSourceName string) (*Database, error) {
-	var result Database
-	var err error
-	if result.db, err = sql.Open("postgres", dataSourceName); err != nil {
+func NewDatabase(dataSourceName string) (Database, error) {
+	uri, err := url.Parse(dataSourceName)
+	if err != nil {
 		return nil, err
 	}
-	if err = result.prepare(); err != nil {
-		return nil, err
-	}
-	return &result, nil
-}
-
-func (d *Database) prepare() error {
-	var err error
-
-	if err = d.joinedHostsStatements.prepare(d.db); err != nil {
-		return err
+	switch uri.Scheme {
+	case "postgres":
+		return postgres.NewDatabase(dataSourceName)
+	default:
+		return nil, errors.New("unknown schema")
 	}
-
-	if err = d.roomStatements.prepare(d.db); err != nil {
-		return err
-	}
-
-	return d.PartitionOffsetStatements.Prepare(d.db, "federationsender")
-}
-
-// UpdateRoom updates the joined hosts for a room and returns what the joined
-// hosts were before the update, or nil if this was a duplicate message.
-// This is called when we receive a message from kafka, so we pass in
-// oldEventID and newEventID to check that we haven't missed any messages or
-// this isn't a duplicate message.
-func (d *Database) UpdateRoom(
-	ctx context.Context,
-	roomID, oldEventID, newEventID string,
-	addHosts []types.JoinedHost,
-	removeHosts []string,
-) (joinedHosts []types.JoinedHost, err error) {
-	err = common.WithTransaction(d.db, func(txn *sql.Tx) error {
-		err = d.insertRoom(ctx, txn, roomID)
-		if err != nil {
-			return err
-		}
-
-		lastSentEventID, err := d.selectRoomForUpdate(ctx, txn, roomID)
-		if err != nil {
-			return err
-		}
-
-		if lastSentEventID == newEventID {
-			// We've handled this message before, so let's just ignore it.
-			// We can only get a duplicate for the last message we processed,
-			// so its enough just to compare the newEventID with lastSentEventID
-			return nil
-		}
-
-		if lastSentEventID != oldEventID {
-			return types.EventIDMismatchError{
-				DatabaseID: lastSentEventID, RoomServerID: oldEventID,
-			}
-		}
-
-		joinedHosts, err = d.selectJoinedHostsWithTx(ctx, txn, roomID)
-		if err != nil {
-			return err
-		}
-
-		for _, add := range addHosts {
-			err = d.insertJoinedHosts(ctx, txn, roomID, add.MemberEventID, add.ServerName)
-			if err != nil {
-				return err
-			}
-		}
-		if err = d.deleteJoinedHosts(ctx, txn, removeHosts); err != nil {
-			return err
-		}
-		return d.updateRoom(ctx, txn, roomID, newEventID)
-	})
-	return
-}
-
-// GetJoinedHosts returns the currently joined hosts for room,
-// as known to federationserver.
-// Returns an error if something goes wrong.
-func (d *Database) GetJoinedHosts(
-	ctx context.Context, roomID string,
-) ([]types.JoinedHost, error) {
-	return d.selectJoinedHosts(ctx, roomID)
 }
diff --git a/mediaapi/routing/download.go b/mediaapi/routing/download.go
index 80ad8418..8544bd64 100644
--- a/mediaapi/routing/download.go
+++ b/mediaapi/routing/download.go
@@ -67,7 +67,7 @@ func Download(
 	origin gomatrixserverlib.ServerName,
 	mediaID types.MediaID,
 	cfg *config.Dendrite,
-	db *storage.Database,
+	db storage.Database,
 	client *gomatrixserverlib.Client,
 	activeRemoteRequests *types.ActiveRemoteRequests,
 	activeThumbnailGeneration *types.ActiveThumbnailGeneration,
@@ -192,7 +192,7 @@ func (r *downloadRequest) doDownload(
 	ctx context.Context,
 	w http.ResponseWriter,
 	cfg *config.Dendrite,
-	db *storage.Database,
+	db storage.Database,
 	client *gomatrixserverlib.Client,
 	activeRemoteRequests *types.ActiveRemoteRequests,
 	activeThumbnailGeneration *types.ActiveThumbnailGeneration,
@@ -235,7 +235,7 @@ func (r *downloadRequest) respondFromLocalFile(
 	absBasePath config.Path,
 	activeThumbnailGeneration *types.ActiveThumbnailGeneration,
 	maxThumbnailGenerators int,
-	db *storage.Database,
+	db storage.Database,
 	dynamicThumbnails bool,
 	thumbnailSizes []config.ThumbnailSize,
 ) (*types.MediaMetadata, error) {
@@ -325,7 +325,7 @@ func (r *downloadRequest) getThumbnailFile(
 	filePath types.Path,
 	activeThumbnailGeneration *types.ActiveThumbnailGeneration,
 	maxThumbnailGenerators int,
-	db *storage.Database,
+	db storage.Database,
 	dynamicThumbnails bool,
 	thumbnailSizes []config.ThumbnailSize,
 ) (*os.File, *types.ThumbnailMetadata, error) {
@@ -407,7 +407,7 @@ func (r *downloadRequest) generateThumbnail(
 	thumbnailSize types.ThumbnailSize,
 	activeThumbnailGeneration *types.ActiveThumbnailGeneration,
 	maxThumbnailGenerators int,
-	db *storage.Database,
+	db storage.Database,
 ) (*types.ThumbnailMetadata, error) {
 	r.Logger.WithFields(log.Fields{
 		"Width":        thumbnailSize.Width,
@@ -443,7 +443,7 @@ func (r *downloadRequest) getRemoteFile(
 	ctx context.Context,
 	client *gomatrixserverlib.Client,
 	cfg *config.Dendrite,
-	db *storage.Database,
+	db storage.Database,
 	activeRemoteRequests *types.ActiveRemoteRequests,
 	activeThumbnailGeneration *types.ActiveThumbnailGeneration,
 ) (errorResponse error) {
@@ -545,7 +545,7 @@ func (r *downloadRequest) fetchRemoteFileAndStoreMetadata(
 	client *gomatrixserverlib.Client,
 	absBasePath config.Path,
 	maxFileSizeBytes config.FileSizeBytes,
-	db *storage.Database,
+	db storage.Database,
 	thumbnailSizes []config.ThumbnailSize,
 	activeThumbnailGeneration *types.ActiveThumbnailGeneration,
 	maxThumbnailGenerators int,
diff --git a/mediaapi/routing/routing.go b/mediaapi/routing/routing.go
index 0f226664..dcc6ac06 100644
--- a/mediaapi/routing/routing.go
+++ b/mediaapi/routing/routing.go
@@ -43,7 +43,7 @@ const pathPrefixR0 = "/_matrix/media/r0"
 func Setup(
 	apiMux *mux.Router,
 	cfg *config.Dendrite,
-	db *storage.Database,
+	db storage.Database,
 	deviceDB *devices.Database,
 	client *gomatrixserverlib.Client,
 ) {
@@ -80,7 +80,7 @@ func Setup(
 func makeDownloadAPI(
 	name string,
 	cfg *config.Dendrite,
-	db *storage.Database,
+	db storage.Database,
 	client *gomatrixserverlib.Client,
 	activeRemoteRequests *types.ActiveRemoteRequests,
 	activeThumbnailGeneration *types.ActiveThumbnailGeneration,
diff --git a/mediaapi/routing/upload.go b/mediaapi/routing/upload.go
index 2cb0d875..91a45319 100644
--- a/mediaapi/routing/upload.go
+++ b/mediaapi/routing/upload.go
@@ -53,7 +53,7 @@ type uploadResponse struct {
 // This implementation supports a configurable maximum file size limit in bytes. If a user tries to upload more than this, they will receive an error that their upload is too large.
 // Uploaded files are processed piece-wise to avoid DoS attacks which would starve the server of memory.
 // TODO: We should time out requests if they have not received any data within a configured timeout period.
-func Upload(req *http.Request, cfg *config.Dendrite, db *storage.Database, activeThumbnailGeneration *types.ActiveThumbnailGeneration) util.JSONResponse {
+func Upload(req *http.Request, cfg *config.Dendrite, db storage.Database, activeThumbnailGeneration *types.ActiveThumbnailGeneration) util.JSONResponse {
 	r, resErr := parseAndValidateRequest(req, cfg)
 	if resErr != nil {
 		return *resErr
@@ -96,7 +96,7 @@ func (r *uploadRequest) doUpload(
 	ctx context.Context,
 	reqReader io.Reader,
 	cfg *config.Dendrite,
-	db *storage.Database,
+	db storage.Database,
 	activeThumbnailGeneration *types.ActiveThumbnailGeneration,
 ) *util.JSONResponse {
 	r.Logger.WithFields(log.Fields{
@@ -214,7 +214,7 @@ func (r *uploadRequest) storeFileAndMetadata(
 	ctx context.Context,
 	tmpDir types.Path,
 	absBasePath config.Path,
-	db *storage.Database,
+	db storage.Database,
 	thumbnailSizes []config.ThumbnailSize,
 	activeThumbnailGeneration *types.ActiveThumbnailGeneration,
 	maxThumbnailGenerators int,
diff --git a/mediaapi/storage/media_repository_table.go b/mediaapi/storage/postgres/media_repository_table.go
index addd47b4..e975530a 100644
--- a/mediaapi/storage/media_repository_table.go
+++ b/mediaapi/storage/postgres/media_repository_table.go
@@ -1,4 +1,5 @@
-// Copyright 2017 Vector Creations Ltd
+// 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.
@@ -12,7 +13,7 @@
 // See the License for the specific language governing permissions and
 // limitations under the License.
 
-package storage
+package postgres
 
 import (
 	"context"
diff --git a/mediaapi/storage/prepare.go b/mediaapi/storage/postgres/prepare.go
index a30586de..090c3d17 100644
--- a/mediaapi/storage/prepare.go
+++ b/mediaapi/storage/postgres/prepare.go
@@ -1,4 +1,5 @@
-// Copyright 2017 Vector Creations Ltd
+// 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.
@@ -14,7 +15,7 @@
 
 // FIXME: This should be made common!
 
-package storage
+package postgres
 
 import (
 	"database/sql"
diff --git a/mediaapi/storage/sql.go b/mediaapi/storage/postgres/sql.go
index 1f8c7be3..181cd15f 100644
--- a/mediaapi/storage/sql.go
+++ b/mediaapi/storage/postgres/sql.go
@@ -1,4 +1,5 @@
-// Copyright 2017 Vector Creations Ltd
+// 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.
@@ -12,7 +13,7 @@
 // See the License for the specific language governing permissions and
 // limitations under the License.
 
-package storage
+package postgres
 
 import (
 	"database/sql"
diff --git a/mediaapi/storage/postgres/storage.go b/mediaapi/storage/postgres/storage.go
new file mode 100644
index 00000000..6259f4a1
--- /dev/null
+++ b/mediaapi/storage/postgres/storage.go
@@ -0,0 +1,106 @@
+// 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"
+
+	// Import the postgres database driver.
+	_ "github.com/lib/pq"
+	"github.com/matrix-org/dendrite/mediaapi/types"
+	"github.com/matrix-org/gomatrixserverlib"
+)
+
+// Database is used to store metadata about a repository of media files.
+type Database struct {
+	statements statements
+	db         *sql.DB
+}
+
+// Open opens a postgres database.
+func Open(dataSourceName string) (*Database, error) {
+	var d Database
+	var err error
+	if d.db, err = sql.Open("postgres", dataSourceName); err != nil {
+		return nil, err
+	}
+	if err = d.statements.prepare(d.db); err != nil {
+		return nil, err
+	}
+	return &d, nil
+}
+
+// StoreMediaMetadata inserts the metadata about the uploaded media into the database.
+// Returns an error if the combination of MediaID and Origin are not unique in the table.
+func (d *Database) StoreMediaMetadata(
+	ctx context.Context, mediaMetadata *types.MediaMetadata,
+) error {
+	return d.statements.media.insertMedia(ctx, mediaMetadata)
+}
+
+// GetMediaMetadata returns metadata about media stored on this server.
+// The media could have been uploaded to this server or fetched from another server and cached here.
+// Returns nil metadata if there is no metadata associated with this media.
+func (d *Database) GetMediaMetadata(
+	ctx context.Context, mediaID types.MediaID, mediaOrigin gomatrixserverlib.ServerName,
+) (*types.MediaMetadata, error) {
+	mediaMetadata, err := d.statements.media.selectMedia(ctx, mediaID, mediaOrigin)
+	if err != nil && err == sql.ErrNoRows {
+		return nil, nil
+	}
+	return mediaMetadata, err
+}
+
+// StoreThumbnail inserts the metadata about the thumbnail into the database.
+// Returns an error if the combination of MediaID and Origin are not unique in the table.
+func (d *Database) StoreThumbnail(
+	ctx context.Context, thumbnailMetadata *types.ThumbnailMetadata,
+) error {
+	return d.statements.thumbnail.insertThumbnail(ctx, thumbnailMetadata)
+}
+
+// GetThumbnail returns metadata about a specific thumbnail.
+// The media could have been uploaded to this server or fetched from another server and cached here.
+// Returns nil metadata if there is no metadata associated with this thumbnail.
+func (d *Database) GetThumbnail(
+	ctx context.Context,
+	mediaID types.MediaID,
+	mediaOrigin gomatrixserverlib.ServerName,
+	width, height int,
+	resizeMethod string,
+) (*types.ThumbnailMetadata, error) {
+	thumbnailMetadata, err := d.statements.thumbnail.selectThumbnail(
+		ctx, mediaID, mediaOrigin, width, height, resizeMethod,
+	)
+	if err != nil && err == sql.ErrNoRows {
+		return nil, nil
+	}
+	return thumbnailMetadata, err
+}
+
+// GetThumbnails returns metadata about all thumbnails for a specific media stored on this server.
+// The media could have been uploaded to this server or fetched from another server and cached here.
+// Returns nil metadata if there are no thumbnails associated with this media.
+func (d *Database) GetThumbnails(
+	ctx context.Context, mediaID types.MediaID, mediaOrigin gomatrixserverlib.ServerName,
+) ([]*types.ThumbnailMetadata, error) {
+	thumbnails, err := d.statements.thumbnail.selectThumbnails(ctx, mediaID, mediaOrigin)
+	if err != nil && err == sql.ErrNoRows {
+		return nil, nil
+	}
+	return thumbnails, err
+}
diff --git a/mediaapi/storage/thumbnail_table.go b/mediaapi/storage/postgres/thumbnail_table.go
index f100485f..167e3795 100644
--- a/mediaapi/storage/thumbnail_table.go
+++ b/mediaapi/storage/postgres/thumbnail_table.go
@@ -1,4 +1,5 @@
-// Copyright 2017 Vector Creations Ltd
+// 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.
@@ -12,7 +13,7 @@
 // See the License for the specific language governing permissions and
 // limitations under the License.
 
-package storage
+package postgres
 
 import (
 	"context"
diff --git a/mediaapi/storage/storage.go b/mediaapi/storage/storage.go
index bef134a9..0f39c1d0 100644
--- a/mediaapi/storage/storage.go
+++ b/mediaapi/storage/storage.go
@@ -1,4 +1,4 @@
-// Copyright 2017 Vector Creations Ltd
+// Copyright 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.
@@ -16,90 +16,32 @@ package storage
 
 import (
 	"context"
-	"database/sql"
+	"errors"
+	"net/url"
 
-	// Import the postgres database driver.
-	_ "github.com/lib/pq"
+	"github.com/matrix-org/dendrite/mediaapi/storage/postgres"
 	"github.com/matrix-org/dendrite/mediaapi/types"
 	"github.com/matrix-org/gomatrixserverlib"
 )
 
-// Database is used to store metadata about a repository of media files.
-type Database struct {
-	statements statements
-	db         *sql.DB
+type Database interface {
+	StoreMediaMetadata(ctx context.Context, mediaMetadata *types.MediaMetadata) error
+	GetMediaMetadata(ctx context.Context, mediaID types.MediaID, mediaOrigin gomatrixserverlib.ServerName) (*types.MediaMetadata, error)
+	StoreThumbnail(ctx context.Context, thumbnailMetadata *types.ThumbnailMetadata) error
+	GetThumbnail(ctx context.Context, mediaID types.MediaID, mediaOrigin gomatrixserverlib.ServerName, width, height int, resizeMethod string) (*types.ThumbnailMetadata, error)
+	GetThumbnails(ctx context.Context, mediaID types.MediaID, mediaOrigin gomatrixserverlib.ServerName) ([]*types.ThumbnailMetadata, error)
 }
 
 // Open opens a postgres database.
-func Open(dataSourceName string) (*Database, error) {
-	var d Database
-	var err error
-	if d.db, err = sql.Open("postgres", dataSourceName); err != nil {
+func Open(dataSourceName string) (Database, error) {
+	uri, err := url.Parse(dataSourceName)
+	if err != nil {
 		return nil, err
 	}
-	if err = d.statements.prepare(d.db); err != nil {
-		return nil, err
-	}
-	return &d, nil
-}
-
-// StoreMediaMetadata inserts the metadata about the uploaded media into the database.
-// Returns an error if the combination of MediaID and Origin are not unique in the table.
-func (d *Database) StoreMediaMetadata(
-	ctx context.Context, mediaMetadata *types.MediaMetadata,
-) error {
-	return d.statements.media.insertMedia(ctx, mediaMetadata)
-}
-
-// GetMediaMetadata returns metadata about media stored on this server.
-// The media could have been uploaded to this server or fetched from another server and cached here.
-// Returns nil metadata if there is no metadata associated with this media.
-func (d *Database) GetMediaMetadata(
-	ctx context.Context, mediaID types.MediaID, mediaOrigin gomatrixserverlib.ServerName,
-) (*types.MediaMetadata, error) {
-	mediaMetadata, err := d.statements.media.selectMedia(ctx, mediaID, mediaOrigin)
-	if err != nil && err == sql.ErrNoRows {
-		return nil, nil
-	}
-	return mediaMetadata, err
-}
-
-// StoreThumbnail inserts the metadata about the thumbnail into the database.
-// Returns an error if the combination of MediaID and Origin are not unique in the table.
-func (d *Database) StoreThumbnail(
-	ctx context.Context, thumbnailMetadata *types.ThumbnailMetadata,
-) error {
-	return d.statements.thumbnail.insertThumbnail(ctx, thumbnailMetadata)
-}
-
-// GetThumbnail returns metadata about a specific thumbnail.
-// The media could have been uploaded to this server or fetched from another server and cached here.
-// Returns nil metadata if there is no metadata associated with this thumbnail.
-func (d *Database) GetThumbnail(
-	ctx context.Context,
-	mediaID types.MediaID,
-	mediaOrigin gomatrixserverlib.ServerName,
-	width, height int,
-	resizeMethod string,
-) (*types.ThumbnailMetadata, error) {
-	thumbnailMetadata, err := d.statements.thumbnail.selectThumbnail(
-		ctx, mediaID, mediaOrigin, width, height, resizeMethod,
-	)
-	if err != nil && err == sql.ErrNoRows {
-		return nil, nil
-	}
-	return thumbnailMetadata, err
-}
-
-// GetThumbnails returns metadata about all thumbnails for a specific media stored on this server.
-// The media could have been uploaded to this server or fetched from another server and cached here.
-// Returns nil metadata if there are no thumbnails associated with this media.
-func (d *Database) GetThumbnails(
-	ctx context.Context, mediaID types.MediaID, mediaOrigin gomatrixserverlib.ServerName,
-) ([]*types.ThumbnailMetadata, error) {
-	thumbnails, err := d.statements.thumbnail.selectThumbnails(ctx, mediaID, mediaOrigin)
-	if err != nil && err == sql.ErrNoRows {
-		return nil, nil
+	switch uri.Scheme {
+	case "postgres":
+		return postgres.Open(dataSourceName)
+	default:
+		return nil, errors.New("unknown schema")
 	}
-	return thumbnails, err
 }
diff --git a/mediaapi/thumbnailer/thumbnailer.go b/mediaapi/thumbnailer/thumbnailer.go
index 61b66ebc..ebf5138c 100644
--- a/mediaapi/thumbnailer/thumbnailer.go
+++ b/mediaapi/thumbnailer/thumbnailer.go
@@ -136,7 +136,7 @@ func isThumbnailExists(
 	dst types.Path,
 	config types.ThumbnailSize,
 	mediaMetadata *types.MediaMetadata,
-	db *storage.Database,
+	db storage.Database,
 	logger *log.Entry,
 ) (bool, error) {
 	thumbnailMetadata, err := db.GetThumbnail(
diff --git a/mediaapi/thumbnailer/thumbnailer_nfnt.go b/mediaapi/thumbnailer/thumbnailer_nfnt.go
index 5df6ce4b..4f1e98aa 100644
--- a/mediaapi/thumbnailer/thumbnailer_nfnt.go
+++ b/mediaapi/thumbnailer/thumbnailer_nfnt.go
@@ -45,7 +45,7 @@ func GenerateThumbnails(
 	mediaMetadata *types.MediaMetadata,
 	activeThumbnailGeneration *types.ActiveThumbnailGeneration,
 	maxThumbnailGenerators int,
-	db *storage.Database,
+	db storage.Database,
 	logger *log.Entry,
 ) (busy bool, errorReturn error) {
 	img, err := readFile(string(src))
@@ -78,7 +78,7 @@ func GenerateThumbnail(
 	mediaMetadata *types.MediaMetadata,
 	activeThumbnailGeneration *types.ActiveThumbnailGeneration,
 	maxThumbnailGenerators int,
-	db *storage.Database,
+	db storage.Database,
 	logger *log.Entry,
 ) (busy bool, errorReturn error) {
 	img, err := readFile(string(src))
@@ -142,7 +142,7 @@ func createThumbnail(
 	mediaMetadata *types.MediaMetadata,
 	activeThumbnailGeneration *types.ActiveThumbnailGeneration,
 	maxThumbnailGenerators int,
-	db *storage.Database,
+	db storage.Database,
 	logger *log.Entry,
 ) (busy bool, errorReturn error) {
 	logger = logger.WithFields(log.Fields{
diff --git a/publicroomsapi/consumers/roomserver.go b/publicroomsapi/consumers/roomserver.go
index b7d42b11..9a817735 100644
--- a/publicroomsapi/consumers/roomserver.go
+++ b/publicroomsapi/consumers/roomserver.go
@@ -29,7 +29,7 @@ import (
 // OutputRoomEventConsumer consumes events that originated in the room server.
 type OutputRoomEventConsumer struct {
 	roomServerConsumer *common.ContinualConsumer
-	db                 *storage.PublicRoomsServerDatabase
+	db                 storage.Database
 	query              api.RoomserverQueryAPI
 }
 
@@ -37,7 +37,7 @@ type OutputRoomEventConsumer struct {
 func NewOutputRoomEventConsumer(
 	cfg *config.Dendrite,
 	kafkaConsumer sarama.Consumer,
-	store *storage.PublicRoomsServerDatabase,
+	store storage.Database,
 	queryAPI api.RoomserverQueryAPI,
 ) *OutputRoomEventConsumer {
 	consumer := common.ContinualConsumer{
diff --git a/publicroomsapi/directory/directory.go b/publicroomsapi/directory/directory.go
index 626a1c15..88981549 100644
--- a/publicroomsapi/directory/directory.go
+++ b/publicroomsapi/directory/directory.go
@@ -30,7 +30,7 @@ type roomVisibility struct {
 
 // GetVisibility implements GET /directory/list/room/{roomID}
 func GetVisibility(
-	req *http.Request, publicRoomsDatabase *storage.PublicRoomsServerDatabase,
+	req *http.Request, publicRoomsDatabase storage.Database,
 	roomID string,
 ) util.JSONResponse {
 	isPublic, err := publicRoomsDatabase.GetRoomVisibility(req.Context(), roomID)
@@ -54,7 +54,7 @@ func GetVisibility(
 // SetVisibility implements PUT /directory/list/room/{roomID}
 // TODO: Check if user has the power level to edit the room visibility
 func SetVisibility(
-	req *http.Request, publicRoomsDatabase *storage.PublicRoomsServerDatabase,
+	req *http.Request, publicRoomsDatabase storage.Database,
 	roomID string,
 ) util.JSONResponse {
 	var v roomVisibility
diff --git a/publicroomsapi/directory/public_rooms.go b/publicroomsapi/directory/public_rooms.go
index ef7b2662..10aaa070 100644
--- a/publicroomsapi/directory/public_rooms.go
+++ b/publicroomsapi/directory/public_rooms.go
@@ -44,7 +44,7 @@ type publicRoomRes struct {
 
 // GetPostPublicRooms implements GET and POST /publicRooms
 func GetPostPublicRooms(
-	req *http.Request, publicRoomDatabase *storage.PublicRoomsServerDatabase,
+	req *http.Request, publicRoomDatabase storage.Database,
 ) util.JSONResponse {
 	var limit int16
 	var offset int64
diff --git a/publicroomsapi/routing/routing.go b/publicroomsapi/routing/routing.go
index 422414bc..3d2d2ac0 100644
--- a/publicroomsapi/routing/routing.go
+++ b/publicroomsapi/routing/routing.go
@@ -34,7 +34,7 @@ const pathPrefixR0 = "/_matrix/client/r0"
 // Due to Setup being used to call many other functions, a gocyclo nolint is
 // applied:
 // nolint: gocyclo
-func Setup(apiMux *mux.Router, deviceDB *devices.Database, publicRoomsDB *storage.PublicRoomsServerDatabase) {
+func Setup(apiMux *mux.Router, deviceDB *devices.Database, publicRoomsDB storage.Database) {
 	r0mux := apiMux.PathPrefix(pathPrefixR0).Subrouter()
 
 	authData := auth.Data{
diff --git a/publicroomsapi/storage/prepare.go b/publicroomsapi/storage/postgres/prepare.go
index b1976599..70b6e516 100644
--- a/publicroomsapi/storage/prepare.go
+++ b/publicroomsapi/storage/postgres/prepare.go
@@ -1,4 +1,5 @@
-// Copyright 2017 Vector Creations Ltd
+// 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.
@@ -12,7 +13,7 @@
 // See the License for the specific language governing permissions and
 // limitations under the License.
 
-package storage
+package postgres
 
 import (
 	"database/sql"
diff --git a/publicroomsapi/storage/public_rooms_table.go b/publicroomsapi/storage/postgres/public_rooms_table.go
index 5e1eb3e1..852afe77 100644
--- a/publicroomsapi/storage/public_rooms_table.go
+++ b/publicroomsapi/storage/postgres/public_rooms_table.go
@@ -1,4 +1,5 @@
-// Copyright 2017 Vector Creations Ltd
+// 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.
@@ -12,7 +13,7 @@
 // See the License for the specific language governing permissions and
 // limitations under the License.
 
-package storage
+package postgres
 
 import (
 	"context"
diff --git a/publicroomsapi/storage/postgres/storage.go b/publicroomsapi/storage/postgres/storage.go
new file mode 100644
index 00000000..67b5efc3
--- /dev/null
+++ b/publicroomsapi/storage/postgres/storage.go
@@ -0,0 +1,253 @@
+// 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"
+	"encoding/json"
+
+	"github.com/matrix-org/dendrite/common"
+	"github.com/matrix-org/dendrite/publicroomsapi/types"
+
+	"github.com/matrix-org/gomatrixserverlib"
+)
+
+// PublicRoomsServerDatabase represents a public rooms server database.
+type PublicRoomsServerDatabase struct {
+	db *sql.DB
+	common.PartitionOffsetStatements
+	statements publicRoomsStatements
+}
+
+type attributeValue interface{}
+
+// NewPublicRoomsServerDatabase creates a new public rooms server database.
+func NewPublicRoomsServerDatabase(dataSourceName string) (*PublicRoomsServerDatabase, error) {
+	var db *sql.DB
+	var err error
+	if db, err = sql.Open("postgres", dataSourceName); err != nil {
+		return nil, err
+	}
+	partitions := common.PartitionOffsetStatements{}
+	if err = partitions.Prepare(db, "publicroomsapi"); err != nil {
+		return nil, err
+	}
+	statements := publicRoomsStatements{}
+	if err = statements.prepare(db); err != nil {
+		return nil, err
+	}
+	return &PublicRoomsServerDatabase{db, partitions, statements}, nil
+}
+
+// GetRoomVisibility returns the room visibility as a boolean: true if the room
+// is publicly visible, false if not.
+// Returns an error if the retrieval failed.
+func (d *PublicRoomsServerDatabase) GetRoomVisibility(
+	ctx context.Context, roomID string,
+) (bool, error) {
+	return d.statements.selectRoomVisibility(ctx, roomID)
+}
+
+// SetRoomVisibility updates the visibility attribute of a room. This attribute
+// must be set to true if the room is publicly visible, false if not.
+// Returns an error if the update failed.
+func (d *PublicRoomsServerDatabase) SetRoomVisibility(
+	ctx context.Context, visible bool, roomID string,
+) error {
+	return d.statements.updateRoomAttribute(ctx, "visibility", visible, roomID)
+}
+
+// CountPublicRooms returns the number of room set as publicly visible on the server.
+// Returns an error if the retrieval failed.
+func (d *PublicRoomsServerDatabase) CountPublicRooms(ctx context.Context) (int64, error) {
+	return d.statements.countPublicRooms(ctx)
+}
+
+// GetPublicRooms returns an array containing the local rooms set as publicly visible, ordered by their number
+// of joined members. This array can be limited by a given number of elements, and offset by a given value.
+// If the limit is 0, doesn't limit the number of results. If the offset is 0 too, the array contains all
+// the rooms set as publicly visible on the server.
+// Returns an error if the retrieval failed.
+func (d *PublicRoomsServerDatabase) GetPublicRooms(
+	ctx context.Context, offset int64, limit int16, filter string,
+) ([]types.PublicRoom, error) {
+	return d.statements.selectPublicRooms(ctx, offset, limit, filter)
+}
+
+// UpdateRoomFromEvents iterate over a slice of state events and call
+// UpdateRoomFromEvent on each of them to update the database representation of
+// the rooms updated by each event.
+// The slice of events to remove is used to update the number of joined members
+// for the room in the database.
+// If the update triggered by one of the events failed, aborts the process and
+// returns an error.
+func (d *PublicRoomsServerDatabase) UpdateRoomFromEvents(
+	ctx context.Context,
+	eventsToAdd []gomatrixserverlib.Event,
+	eventsToRemove []gomatrixserverlib.Event,
+) error {
+	for _, event := range eventsToAdd {
+		if err := d.UpdateRoomFromEvent(ctx, event); err != nil {
+			return err
+		}
+	}
+
+	for _, event := range eventsToRemove {
+		if event.Type() == "m.room.member" {
+			if err := d.updateNumJoinedUsers(ctx, event, true); err != nil {
+				return err
+			}
+		}
+	}
+
+	return nil
+}
+
+// UpdateRoomFromEvent updates the database representation of a room from a Matrix event, by
+// checking the event's type to know which attribute to change and using the event's content
+// to define the new value of the attribute.
+// If the event doesn't match with any property used to compute the public room directory,
+// does nothing.
+// If something went wrong during the process, returns an error.
+func (d *PublicRoomsServerDatabase) UpdateRoomFromEvent(
+	ctx context.Context, event gomatrixserverlib.Event,
+) error {
+	// Process the event according to its type
+	switch event.Type() {
+	case "m.room.create":
+		return d.statements.insertNewRoom(ctx, event.RoomID())
+	case "m.room.member":
+		return d.updateNumJoinedUsers(ctx, event, false)
+	case "m.room.aliases":
+		return d.updateRoomAliases(ctx, event)
+	case "m.room.canonical_alias":
+		var content common.CanonicalAliasContent
+		field := &(content.Alias)
+		attrName := "canonical_alias"
+		return d.updateStringAttribute(ctx, attrName, event, &content, field)
+	case "m.room.name":
+		var content common.NameContent
+		field := &(content.Name)
+		attrName := "name"
+		return d.updateStringAttribute(ctx, attrName, event, &content, field)
+	case "m.room.topic":
+		var content common.TopicContent
+		field := &(content.Topic)
+		attrName := "topic"
+		return d.updateStringAttribute(ctx, attrName, event, &content, field)
+	case "m.room.avatar":
+		var content common.AvatarContent
+		field := &(content.URL)
+		attrName := "avatar_url"
+		return d.updateStringAttribute(ctx, attrName, event, &content, field)
+	case "m.room.history_visibility":
+		var content common.HistoryVisibilityContent
+		field := &(content.HistoryVisibility)
+		attrName := "world_readable"
+		strForTrue := "world_readable"
+		return d.updateBooleanAttribute(ctx, attrName, event, &content, field, strForTrue)
+	case "m.room.guest_access":
+		var content common.GuestAccessContent
+		field := &(content.GuestAccess)
+		attrName := "guest_can_join"
+		strForTrue := "can_join"
+		return d.updateBooleanAttribute(ctx, attrName, event, &content, field, strForTrue)
+	}
+
+	// If the event type didn't match, return with no error
+	return nil
+}
+
+// updateNumJoinedUsers updates the number of joined user in the database representation
+// of a room using a given "m.room.member" Matrix event.
+// If the membership property of the event isn't "join", ignores it and returs nil.
+// If the remove parameter is set to false, increments the joined members counter in the
+// database, if set to truem decrements it.
+// Returns an error if the update failed.
+func (d *PublicRoomsServerDatabase) updateNumJoinedUsers(
+	ctx context.Context, membershipEvent gomatrixserverlib.Event, remove bool,
+) error {
+	membership, err := membershipEvent.Membership()
+	if err != nil {
+		return err
+	}
+
+	if membership != gomatrixserverlib.Join {
+		return nil
+	}
+
+	if remove {
+		return d.statements.decrementJoinedMembersInRoom(ctx, membershipEvent.RoomID())
+	}
+	return d.statements.incrementJoinedMembersInRoom(ctx, membershipEvent.RoomID())
+}
+
+// updateStringAttribute updates a given string attribute in the database
+// representation of a room using a given string data field from content of the
+// Matrix event triggering the update.
+// Returns an error if decoding the Matrix event's content or updating the attribute
+// failed.
+func (d *PublicRoomsServerDatabase) updateStringAttribute(
+	ctx context.Context, attrName string, event gomatrixserverlib.Event,
+	content interface{}, field *string,
+) error {
+	if err := json.Unmarshal(event.Content(), content); err != nil {
+		return err
+	}
+
+	return d.statements.updateRoomAttribute(ctx, attrName, *field, event.RoomID())
+}
+
+// updateBooleanAttribute updates a given boolean attribute in the database
+// representation of a room using a given string data field from content of the
+// Matrix event triggering the update.
+// The attribute is set to true if the field matches a given string, false if not.
+// Returns an error if decoding the Matrix event's content or updating the attribute
+// failed.
+func (d *PublicRoomsServerDatabase) updateBooleanAttribute(
+	ctx context.Context, attrName string, event gomatrixserverlib.Event,
+	content interface{}, field *string, strForTrue string,
+) error {
+	if err := json.Unmarshal(event.Content(), content); err != nil {
+		return err
+	}
+
+	var attrValue bool
+	if *field == strForTrue {
+		attrValue = true
+	} else {
+		attrValue = false
+	}
+
+	return d.statements.updateRoomAttribute(ctx, attrName, attrValue, event.RoomID())
+}
+
+// updateRoomAliases decodes the content of a "m.room.aliases" Matrix event and update the list of aliases of
+// a given room with it.
+// Returns an error if decoding the Matrix event or updating the list failed.
+func (d *PublicRoomsServerDatabase) updateRoomAliases(
+	ctx context.Context, aliasesEvent gomatrixserverlib.Event,
+) error {
+	var content common.AliasesContent
+	if err := json.Unmarshal(aliasesEvent.Content(), &content); err != nil {
+		return err
+	}
+
+	return d.statements.updateRoomAttribute(
+		ctx, "aliases", content.Aliases, aliasesEvent.RoomID(),
+	)
+}
diff --git a/publicroomsapi/storage/storage.go b/publicroomsapi/storage/storage.go
index aa980694..a6a39d52 100644
--- a/publicroomsapi/storage/storage.go
+++ b/publicroomsapi/storage/storage.go
@@ -1,4 +1,4 @@
-// Copyright 2017 Vector Creations Ltd
+// Copyright 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.
@@ -16,237 +16,35 @@ package storage
 
 import (
 	"context"
-	"database/sql"
-	"encoding/json"
+	"errors"
+	"net/url"
 
 	"github.com/matrix-org/dendrite/common"
+	"github.com/matrix-org/dendrite/publicroomsapi/storage/postgres"
 	"github.com/matrix-org/dendrite/publicroomsapi/types"
-
 	"github.com/matrix-org/gomatrixserverlib"
 )
 
-// PublicRoomsServerDatabase represents a public rooms server database.
-type PublicRoomsServerDatabase struct {
-	db *sql.DB
-	common.PartitionOffsetStatements
-	statements publicRoomsStatements
-}
-
-type attributeValue interface{}
-
-// NewPublicRoomsServerDatabase creates a new public rooms server database.
-func NewPublicRoomsServerDatabase(dataSourceName string) (*PublicRoomsServerDatabase, error) {
-	var db *sql.DB
-	var err error
-	if db, err = sql.Open("postgres", dataSourceName); err != nil {
-		return nil, err
-	}
-	partitions := common.PartitionOffsetStatements{}
-	if err = partitions.Prepare(db, "publicroomsapi"); err != nil {
-		return nil, err
-	}
-	statements := publicRoomsStatements{}
-	if err = statements.prepare(db); err != nil {
-		return nil, err
-	}
-	return &PublicRoomsServerDatabase{db, partitions, statements}, nil
-}
-
-// GetRoomVisibility returns the room visibility as a boolean: true if the room
-// is publicly visible, false if not.
-// Returns an error if the retrieval failed.
-func (d *PublicRoomsServerDatabase) GetRoomVisibility(
-	ctx context.Context, roomID string,
-) (bool, error) {
-	return d.statements.selectRoomVisibility(ctx, roomID)
-}
-
-// SetRoomVisibility updates the visibility attribute of a room. This attribute
-// must be set to true if the room is publicly visible, false if not.
-// Returns an error if the update failed.
-func (d *PublicRoomsServerDatabase) SetRoomVisibility(
-	ctx context.Context, visible bool, roomID string,
-) error {
-	return d.statements.updateRoomAttribute(ctx, "visibility", visible, roomID)
-}
-
-// CountPublicRooms returns the number of room set as publicly visible on the server.
-// Returns an error if the retrieval failed.
-func (d *PublicRoomsServerDatabase) CountPublicRooms(ctx context.Context) (int64, error) {
-	return d.statements.countPublicRooms(ctx)
-}
-
-// GetPublicRooms returns an array containing the local rooms set as publicly visible, ordered by their number
-// of joined members. This array can be limited by a given number of elements, and offset by a given value.
-// If the limit is 0, doesn't limit the number of results. If the offset is 0 too, the array contains all
-// the rooms set as publicly visible on the server.
-// Returns an error if the retrieval failed.
-func (d *PublicRoomsServerDatabase) GetPublicRooms(
-	ctx context.Context, offset int64, limit int16, filter string,
-) ([]types.PublicRoom, error) {
-	return d.statements.selectPublicRooms(ctx, offset, limit, filter)
-}
-
-// UpdateRoomFromEvents iterate over a slice of state events and call
-// UpdateRoomFromEvent on each of them to update the database representation of
-// the rooms updated by each event.
-// The slice of events to remove is used to update the number of joined members
-// for the room in the database.
-// If the update triggered by one of the events failed, aborts the process and
-// returns an error.
-func (d *PublicRoomsServerDatabase) UpdateRoomFromEvents(
-	ctx context.Context,
-	eventsToAdd []gomatrixserverlib.Event,
-	eventsToRemove []gomatrixserverlib.Event,
-) error {
-	for _, event := range eventsToAdd {
-		if err := d.UpdateRoomFromEvent(ctx, event); err != nil {
-			return err
-		}
-	}
-
-	for _, event := range eventsToRemove {
-		if event.Type() == "m.room.member" {
-			if err := d.updateNumJoinedUsers(ctx, event, true); err != nil {
-				return err
-			}
-		}
-	}
-
-	return nil
-}
-
-// UpdateRoomFromEvent updates the database representation of a room from a Matrix event, by
-// checking the event's type to know which attribute to change and using the event's content
-// to define the new value of the attribute.
-// If the event doesn't match with any property used to compute the public room directory,
-// does nothing.
-// If something went wrong during the process, returns an error.
-func (d *PublicRoomsServerDatabase) UpdateRoomFromEvent(
-	ctx context.Context, event gomatrixserverlib.Event,
-) error {
-	// Process the event according to its type
-	switch event.Type() {
-	case "m.room.create":
-		return d.statements.insertNewRoom(ctx, event.RoomID())
-	case "m.room.member":
-		return d.updateNumJoinedUsers(ctx, event, false)
-	case "m.room.aliases":
-		return d.updateRoomAliases(ctx, event)
-	case "m.room.canonical_alias":
-		var content common.CanonicalAliasContent
-		field := &(content.Alias)
-		attrName := "canonical_alias"
-		return d.updateStringAttribute(ctx, attrName, event, &content, field)
-	case "m.room.name":
-		var content common.NameContent
-		field := &(content.Name)
-		attrName := "name"
-		return d.updateStringAttribute(ctx, attrName, event, &content, field)
-	case "m.room.topic":
-		var content common.TopicContent
-		field := &(content.Topic)
-		attrName := "topic"
-		return d.updateStringAttribute(ctx, attrName, event, &content, field)
-	case "m.room.avatar":
-		var content common.AvatarContent
-		field := &(content.URL)
-		attrName := "avatar_url"
-		return d.updateStringAttribute(ctx, attrName, event, &content, field)
-	case "m.room.history_visibility":
-		var content common.HistoryVisibilityContent
-		field := &(content.HistoryVisibility)
-		attrName := "world_readable"
-		strForTrue := "world_readable"
-		return d.updateBooleanAttribute(ctx, attrName, event, &content, field, strForTrue)
-	case "m.room.guest_access":
-		var content common.GuestAccessContent
-		field := &(content.GuestAccess)
-		attrName := "guest_can_join"
-		strForTrue := "can_join"
-		return d.updateBooleanAttribute(ctx, attrName, event, &content, field, strForTrue)
-	}
-
-	// If the event type didn't match, return with no error
-	return nil
+type Database interface {
+	common.PartitionStorer
+	GetRoomVisibility(ctx context.Context, roomID string) (bool, error)
+	SetRoomVisibility(ctx context.Context, visible bool, roomID string) error
+	CountPublicRooms(ctx context.Context) (int64, error)
+	GetPublicRooms(ctx context.Context, offset int64, limit int16, filter string) ([]types.PublicRoom, error)
+	UpdateRoomFromEvents(ctx context.Context, eventsToAdd []gomatrixserverlib.Event, eventsToRemove []gomatrixserverlib.Event) error
+	UpdateRoomFromEvent(ctx context.Context, event gomatrixserverlib.Event) error
 }
 
-// updateNumJoinedUsers updates the number of joined user in the database representation
-// of a room using a given "m.room.member" Matrix event.
-// If the membership property of the event isn't "join", ignores it and returs nil.
-// If the remove parameter is set to false, increments the joined members counter in the
-// database, if set to truem decrements it.
-// Returns an error if the update failed.
-func (d *PublicRoomsServerDatabase) updateNumJoinedUsers(
-	ctx context.Context, membershipEvent gomatrixserverlib.Event, remove bool,
-) error {
-	membership, err := membershipEvent.Membership()
+// NewPublicRoomsServerDatabase opens a database connection.
+func NewPublicRoomsServerDatabase(dataSourceName string) (Database, error) {
+	uri, err := url.Parse(dataSourceName)
 	if err != nil {
-		return err
-	}
-
-	if membership != gomatrixserverlib.Join {
-		return nil
-	}
-
-	if remove {
-		return d.statements.decrementJoinedMembersInRoom(ctx, membershipEvent.RoomID())
-	}
-	return d.statements.incrementJoinedMembersInRoom(ctx, membershipEvent.RoomID())
-}
-
-// updateStringAttribute updates a given string attribute in the database
-// representation of a room using a given string data field from content of the
-// Matrix event triggering the update.
-// Returns an error if decoding the Matrix event's content or updating the attribute
-// failed.
-func (d *PublicRoomsServerDatabase) updateStringAttribute(
-	ctx context.Context, attrName string, event gomatrixserverlib.Event,
-	content interface{}, field *string,
-) error {
-	if err := json.Unmarshal(event.Content(), content); err != nil {
-		return err
-	}
-
-	return d.statements.updateRoomAttribute(ctx, attrName, *field, event.RoomID())
-}
-
-// updateBooleanAttribute updates a given boolean attribute in the database
-// representation of a room using a given string data field from content of the
-// Matrix event triggering the update.
-// The attribute is set to true if the field matches a given string, false if not.
-// Returns an error if decoding the Matrix event's content or updating the attribute
-// failed.
-func (d *PublicRoomsServerDatabase) updateBooleanAttribute(
-	ctx context.Context, attrName string, event gomatrixserverlib.Event,
-	content interface{}, field *string, strForTrue string,
-) error {
-	if err := json.Unmarshal(event.Content(), content); err != nil {
-		return err
-	}
-
-	var attrValue bool
-	if *field == strForTrue {
-		attrValue = true
-	} else {
-		attrValue = false
+		return nil, err
 	}
-
-	return d.statements.updateRoomAttribute(ctx, attrName, attrValue, event.RoomID())
-}
-
-// updateRoomAliases decodes the content of a "m.room.aliases" Matrix event and update the list of aliases of
-// a given room with it.
-// Returns an error if decoding the Matrix event or updating the list failed.
-func (d *PublicRoomsServerDatabase) updateRoomAliases(
-	ctx context.Context, aliasesEvent gomatrixserverlib.Event,
-) error {
-	var content common.AliasesContent
-	if err := json.Unmarshal(aliasesEvent.Content(), &content); err != nil {
-		return err
+	switch uri.Scheme {
+	case "postgres":
+		return postgres.NewPublicRoomsServerDatabase(dataSourceName)
+	default:
+		return nil, errors.New("unknown schema")
 	}
-
-	return d.statements.updateRoomAttribute(
-		ctx, "aliases", content.Aliases, aliasesEvent.RoomID(),
-	)
 }
diff --git a/roomserver/storage/event_json_table.go b/roomserver/storage/postgres/event_json_table.go
index b81667d9..415fb84e 100644
--- a/roomserver/storage/event_json_table.go
+++ b/roomserver/storage/postgres/event_json_table.go
@@ -1,4 +1,5 @@
-// Copyright 2017 Vector Creations Ltd
+// 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.
@@ -12,7 +13,7 @@
 // See the License for the specific language governing permissions and
 // limitations under the License.
 
-package storage
+package postgres
 
 import (
 	"context"
diff --git a/roomserver/storage/event_state_keys_table.go b/roomserver/storage/postgres/event_state_keys_table.go
index 1ef93370..c3aaa498 100644
--- a/roomserver/storage/event_state_keys_table.go
+++ b/roomserver/storage/postgres/event_state_keys_table.go
@@ -1,4 +1,5 @@
-// Copyright 2017 Vector Creations Ltd
+// 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.
@@ -12,7 +13,7 @@
 // See the License for the specific language governing permissions and
 // limitations under the License.
 
-package storage
+package postgres
 
 import (
 	"context"
diff --git a/roomserver/storage/event_types_table.go b/roomserver/storage/postgres/event_types_table.go
index 7b8d53a5..1ec2e7cd 100644
--- a/roomserver/storage/event_types_table.go
+++ b/roomserver/storage/postgres/event_types_table.go
@@ -1,4 +1,5 @@
-// Copyright 2017 Vector Creations Ltd
+// 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.
@@ -12,7 +13,7 @@
 // See the License for the specific language governing permissions and
 // limitations under the License.
 
-package storage
+package postgres
 
 import (
 	"context"
diff --git a/roomserver/storage/events_table.go b/roomserver/storage/postgres/events_table.go
index 5bad939f..1e8a5665 100644
--- a/roomserver/storage/events_table.go
+++ b/roomserver/storage/postgres/events_table.go
@@ -1,4 +1,5 @@
-// Copyright 2017 Vector Creations Ltd
+// 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.
@@ -12,7 +13,7 @@
 // See the License for the specific language governing permissions and
 // limitations under the License.
 
-package storage
+package postgres
 
 import (
 	"context"
diff --git a/roomserver/storage/invite_table.go b/roomserver/storage/postgres/invite_table.go
index 4f9cdfb4..43cd5ba0 100644
--- a/roomserver/storage/invite_table.go
+++ b/roomserver/storage/postgres/invite_table.go
@@ -1,4 +1,5 @@
-// Copyright 2017 Vector Creations Ltd
+// 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.
@@ -12,7 +13,7 @@
 // See the License for the specific language governing permissions and
 // limitations under the License.
 
-package storage
+package postgres
 
 import (
 	"context"
diff --git a/roomserver/storage/membership_table.go b/roomserver/storage/postgres/membership_table.go
index 88a9ed72..9f41fd67 100644
--- a/roomserver/storage/membership_table.go
+++ b/roomserver/storage/postgres/membership_table.go
@@ -1,4 +1,5 @@
-// Copyright 2017 Vector Creations Ltd
+// 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.
@@ -12,7 +13,7 @@
 // See the License for the specific language governing permissions and
 // limitations under the License.
 
-package storage
+package postgres
 
 import (
 	"context"
diff --git a/roomserver/storage/prepare.go b/roomserver/storage/postgres/prepare.go
index b1976599..70b6e516 100644
--- a/roomserver/storage/prepare.go
+++ b/roomserver/storage/postgres/prepare.go
@@ -1,4 +1,5 @@
-// Copyright 2017 Vector Creations Ltd
+// 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.
@@ -12,7 +13,7 @@
 // See the License for the specific language governing permissions and
 // limitations under the License.
 
-package storage
+package postgres
 
 import (
 	"database/sql"
diff --git a/roomserver/storage/previous_events_table.go b/roomserver/storage/postgres/previous_events_table.go
index 81d581a9..4c21b308 100644
--- a/roomserver/storage/previous_events_table.go
+++ b/roomserver/storage/postgres/previous_events_table.go
@@ -1,4 +1,5 @@
-// Copyright 2017 Vector Creations Ltd
+// 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.
@@ -12,7 +13,7 @@
 // See the License for the specific language governing permissions and
 // limitations under the License.
 
-package storage
+package postgres
 
 import (
 	"context"
diff --git a/roomserver/storage/room_aliases_table.go b/roomserver/storage/postgres/room_aliases_table.go
index 3ed20e8e..ad1b560c 100644
--- a/roomserver/storage/room_aliases_table.go
+++ b/roomserver/storage/postgres/room_aliases_table.go
@@ -1,4 +1,5 @@
-// Copyright 2017 Vector Creations Ltd
+// 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.
@@ -12,7 +13,7 @@
 // See the License for the specific language governing permissions and
 // limitations under the License.
 
-package storage
+package postgres
 
 import (
 	"context"
diff --git a/roomserver/storage/rooms_table.go b/roomserver/storage/postgres/rooms_table.go
index 64193ffe..ccc201b1 100644
--- a/roomserver/storage/rooms_table.go
+++ b/roomserver/storage/postgres/rooms_table.go
@@ -1,4 +1,5 @@
-// Copyright 2017 Vector Creations Ltd
+// 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.
@@ -12,7 +13,7 @@
 // See the License for the specific language governing permissions and
 // limitations under the License.
 
-package storage
+package postgres
 
 import (
 	"context"
diff --git a/roomserver/storage/sql.go b/roomserver/storage/postgres/sql.go
index 05efa8dd..5956886c 100644
--- a/roomserver/storage/sql.go
+++ b/roomserver/storage/postgres/sql.go
@@ -1,4 +1,5 @@
-// Copyright 2017 Vector Creations Ltd
+// 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.
@@ -12,7 +13,7 @@
 // See the License for the specific language governing permissions and
 // limitations under the License.
 
-package storage
+package postgres
 
 import (
 	"database/sql"
diff --git a/roomserver/storage/state_block_table.go b/roomserver/storage/postgres/state_block_table.go
index b2e8ef8a..15e69cc9 100644
--- a/roomserver/storage/state_block_table.go
+++ b/roomserver/storage/postgres/state_block_table.go
@@ -1,4 +1,5 @@
-// Copyright 2017 Vector Creations Ltd
+// 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.
@@ -12,7 +13,7 @@
 // See the License for the specific language governing permissions and
 // limitations under the License.
 
-package storage
+package postgres
 
 import (
 	"context"
diff --git a/roomserver/storage/state_block_table_test.go b/roomserver/storage/postgres/state_block_table_test.go
index f891b5bc..a0e2ec95 100644
--- a/roomserver/storage/state_block_table_test.go
+++ b/roomserver/storage/postgres/state_block_table_test.go
@@ -1,4 +1,5 @@
-// Copyright 2017 Vector Creations Ltd
+// 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.
@@ -12,7 +13,7 @@
 // See the License for the specific language governing permissions and
 // limitations under the License.
 
-package storage
+package postgres
 
 import (
 	"sort"
diff --git a/roomserver/storage/state_snapshot_table.go b/roomserver/storage/postgres/state_snapshot_table.go
index aa14daad..76f1d2b6 100644
--- a/roomserver/storage/state_snapshot_table.go
+++ b/roomserver/storage/postgres/state_snapshot_table.go
@@ -1,4 +1,5 @@
-// Copyright 2017 Vector Creations Ltd
+// 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.
@@ -12,7 +13,7 @@
 // See the License for the specific language governing permissions and
 // limitations under the License.
 
-package storage
+package postgres
 
 import (
 	"context"
diff --git a/roomserver/storage/postgres/storage.go b/roomserver/storage/postgres/storage.go
new file mode 100644
index 00000000..93450e5a
--- /dev/null
+++ b/roomserver/storage/postgres/storage.go
@@ -0,0 +1,713 @@
+// 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"
+
+	// Import the postgres database driver.
+	_ "github.com/lib/pq"
+	"github.com/matrix-org/dendrite/roomserver/api"
+	"github.com/matrix-org/dendrite/roomserver/types"
+	"github.com/matrix-org/gomatrixserverlib"
+)
+
+// A Database is used to store room events and stream offsets.
+type Database struct {
+	statements statements
+	db         *sql.DB
+}
+
+// Open a postgres database.
+func Open(dataSourceName string) (*Database, error) {
+	var d Database
+	var err error
+	if d.db, err = sql.Open("postgres", dataSourceName); err != nil {
+		return nil, err
+	}
+	if err = d.statements.prepare(d.db); err != nil {
+		return nil, err
+	}
+	return &d, nil
+}
+
+// StoreEvent implements input.EventDatabase
+func (d *Database) StoreEvent(
+	ctx context.Context, event gomatrixserverlib.Event,
+	txnAndSessionID *api.TransactionID, authEventNIDs []types.EventNID,
+) (types.RoomNID, types.StateAtEvent, error) {
+	var (
+		roomNID          types.RoomNID
+		eventTypeNID     types.EventTypeNID
+		eventStateKeyNID types.EventStateKeyNID
+		eventNID         types.EventNID
+		stateNID         types.StateSnapshotNID
+		err              error
+	)
+
+	if txnAndSessionID != nil {
+		if err = d.statements.insertTransaction(
+			ctx, txnAndSessionID.TransactionID,
+			txnAndSessionID.SessionID, event.Sender(), event.EventID(),
+		); err != nil {
+			return 0, types.StateAtEvent{}, err
+		}
+	}
+
+	if roomNID, err = d.assignRoomNID(ctx, nil, event.RoomID()); err != nil {
+		return 0, types.StateAtEvent{}, err
+	}
+
+	if eventTypeNID, err = d.assignEventTypeNID(ctx, event.Type()); err != nil {
+		return 0, types.StateAtEvent{}, err
+	}
+
+	eventStateKey := event.StateKey()
+	// Assigned a numeric ID for the state_key if there is one present.
+	// Otherwise set the numeric ID for the state_key to 0.
+	if eventStateKey != nil {
+		if eventStateKeyNID, err = d.assignStateKeyNID(ctx, nil, *eventStateKey); err != nil {
+			return 0, types.StateAtEvent{}, err
+		}
+	}
+
+	if eventNID, stateNID, err = d.statements.insertEvent(
+		ctx,
+		roomNID,
+		eventTypeNID,
+		eventStateKeyNID,
+		event.EventID(),
+		event.EventReference().EventSHA256,
+		authEventNIDs,
+		event.Depth(),
+	); err != nil {
+		if err == sql.ErrNoRows {
+			// We've already inserted the event so select the numeric event ID
+			eventNID, stateNID, err = d.statements.selectEvent(ctx, event.EventID())
+		}
+		if err != nil {
+			return 0, types.StateAtEvent{}, err
+		}
+	}
+
+	if err = d.statements.insertEventJSON(ctx, eventNID, event.JSON()); err != nil {
+		return 0, types.StateAtEvent{}, err
+	}
+
+	return roomNID, types.StateAtEvent{
+		BeforeStateSnapshotNID: stateNID,
+		StateEntry: types.StateEntry{
+			StateKeyTuple: types.StateKeyTuple{
+				EventTypeNID:     eventTypeNID,
+				EventStateKeyNID: eventStateKeyNID,
+			},
+			EventNID: eventNID,
+		},
+	}, nil
+}
+
+func (d *Database) assignRoomNID(
+	ctx context.Context, txn *sql.Tx, roomID string,
+) (types.RoomNID, error) {
+	// Check if we already have a numeric ID in the database.
+	roomNID, err := d.statements.selectRoomNID(ctx, txn, roomID)
+	if err == sql.ErrNoRows {
+		// We don't have a numeric ID so insert one into the database.
+		roomNID, err = d.statements.insertRoomNID(ctx, txn, roomID)
+		if err == sql.ErrNoRows {
+			// We raced with another insert so run the select again.
+			roomNID, err = d.statements.selectRoomNID(ctx, txn, roomID)
+		}
+	}
+	return roomNID, err
+}
+
+func (d *Database) assignEventTypeNID(
+	ctx context.Context, eventType string,
+) (types.EventTypeNID, error) {
+	// Check if we already have a numeric ID in the database.
+	eventTypeNID, err := d.statements.selectEventTypeNID(ctx, eventType)
+	if err == sql.ErrNoRows {
+		// We don't have a numeric ID so insert one into the database.
+		eventTypeNID, err = d.statements.insertEventTypeNID(ctx, eventType)
+		if err == sql.ErrNoRows {
+			// We raced with another insert so run the select again.
+			eventTypeNID, err = d.statements.selectEventTypeNID(ctx, eventType)
+		}
+	}
+	return eventTypeNID, err
+}
+
+func (d *Database) assignStateKeyNID(
+	ctx context.Context, txn *sql.Tx, eventStateKey string,
+) (types.EventStateKeyNID, error) {
+	// Check if we already have a numeric ID in the database.
+	eventStateKeyNID, err := d.statements.selectEventStateKeyNID(ctx, txn, eventStateKey)
+	if err == sql.ErrNoRows {
+		// We don't have a numeric ID so insert one into the database.
+		eventStateKeyNID, err = d.statements.insertEventStateKeyNID(ctx, txn, eventStateKey)
+		if err == sql.ErrNoRows {
+			// We raced with another insert so run the select again.
+			eventStateKeyNID, err = d.statements.selectEventStateKeyNID(ctx, txn, eventStateKey)
+		}
+	}
+	return eventStateKeyNID, err
+}
+
+// StateEntriesForEventIDs implements input.EventDatabase
+func (d *Database) StateEntriesForEventIDs(
+	ctx context.Context, eventIDs []string,
+) ([]types.StateEntry, error) {
+	return d.statements.bulkSelectStateEventByID(ctx, eventIDs)
+}
+
+// EventTypeNIDs implements state.RoomStateDatabase
+func (d *Database) EventTypeNIDs(
+	ctx context.Context, eventTypes []string,
+) (map[string]types.EventTypeNID, error) {
+	return d.statements.bulkSelectEventTypeNID(ctx, eventTypes)
+}
+
+// EventStateKeyNIDs implements state.RoomStateDatabase
+func (d *Database) EventStateKeyNIDs(
+	ctx context.Context, eventStateKeys []string,
+) (map[string]types.EventStateKeyNID, error) {
+	return d.statements.bulkSelectEventStateKeyNID(ctx, eventStateKeys)
+}
+
+// EventStateKeys implements query.RoomserverQueryAPIDatabase
+func (d *Database) EventStateKeys(
+	ctx context.Context, eventStateKeyNIDs []types.EventStateKeyNID,
+) (map[types.EventStateKeyNID]string, error) {
+	return d.statements.bulkSelectEventStateKey(ctx, eventStateKeyNIDs)
+}
+
+// EventNIDs implements query.RoomserverQueryAPIDatabase
+func (d *Database) EventNIDs(
+	ctx context.Context, eventIDs []string,
+) (map[string]types.EventNID, error) {
+	return d.statements.bulkSelectEventNID(ctx, eventIDs)
+}
+
+// Events implements input.EventDatabase
+func (d *Database) Events(
+	ctx context.Context, eventNIDs []types.EventNID,
+) ([]types.Event, error) {
+	eventJSONs, err := d.statements.bulkSelectEventJSON(ctx, eventNIDs)
+	if err != nil {
+		return nil, err
+	}
+	results := make([]types.Event, len(eventJSONs))
+	for i, eventJSON := range eventJSONs {
+		result := &results[i]
+		result.EventNID = eventJSON.EventNID
+		// TODO: Use NewEventFromTrustedJSON for efficiency
+		result.Event, err = gomatrixserverlib.NewEventFromUntrustedJSON(eventJSON.EventJSON)
+		if err != nil {
+			return nil, err
+		}
+	}
+	return results, nil
+}
+
+// AddState implements input.EventDatabase
+func (d *Database) AddState(
+	ctx context.Context,
+	roomNID types.RoomNID,
+	stateBlockNIDs []types.StateBlockNID,
+	state []types.StateEntry,
+) (types.StateSnapshotNID, error) {
+	if len(state) > 0 {
+		stateBlockNID, err := d.statements.selectNextStateBlockNID(ctx)
+		if err != nil {
+			return 0, err
+		}
+		if err = d.statements.bulkInsertStateData(ctx, stateBlockNID, state); err != nil {
+			return 0, err
+		}
+		stateBlockNIDs = append(stateBlockNIDs[:len(stateBlockNIDs):len(stateBlockNIDs)], stateBlockNID)
+	}
+
+	return d.statements.insertState(ctx, roomNID, stateBlockNIDs)
+}
+
+// SetState implements input.EventDatabase
+func (d *Database) SetState(
+	ctx context.Context, eventNID types.EventNID, stateNID types.StateSnapshotNID,
+) error {
+	return d.statements.updateEventState(ctx, eventNID, stateNID)
+}
+
+// StateAtEventIDs implements input.EventDatabase
+func (d *Database) StateAtEventIDs(
+	ctx context.Context, eventIDs []string,
+) ([]types.StateAtEvent, error) {
+	return d.statements.bulkSelectStateAtEventByID(ctx, eventIDs)
+}
+
+// StateBlockNIDs implements state.RoomStateDatabase
+func (d *Database) StateBlockNIDs(
+	ctx context.Context, stateNIDs []types.StateSnapshotNID,
+) ([]types.StateBlockNIDList, error) {
+	return d.statements.bulkSelectStateBlockNIDs(ctx, stateNIDs)
+}
+
+// StateEntries implements state.RoomStateDatabase
+func (d *Database) StateEntries(
+	ctx context.Context, stateBlockNIDs []types.StateBlockNID,
+) ([]types.StateEntryList, error) {
+	return d.statements.bulkSelectStateBlockEntries(ctx, stateBlockNIDs)
+}
+
+// SnapshotNIDFromEventID implements state.RoomStateDatabase
+func (d *Database) SnapshotNIDFromEventID(
+	ctx context.Context, eventID string,
+) (types.StateSnapshotNID, error) {
+	_, stateNID, err := d.statements.selectEvent(ctx, eventID)
+	return stateNID, err
+}
+
+// EventIDs implements input.RoomEventDatabase
+func (d *Database) EventIDs(
+	ctx context.Context, eventNIDs []types.EventNID,
+) (map[types.EventNID]string, error) {
+	return d.statements.bulkSelectEventID(ctx, eventNIDs)
+}
+
+// GetLatestEventsForUpdate implements input.EventDatabase
+func (d *Database) GetLatestEventsForUpdate(
+	ctx context.Context, roomNID types.RoomNID,
+) (types.RoomRecentEventsUpdater, error) {
+	txn, err := d.db.Begin()
+	if err != nil {
+		return nil, err
+	}
+	eventNIDs, lastEventNIDSent, currentStateSnapshotNID, err :=
+		d.statements.selectLatestEventsNIDsForUpdate(ctx, txn, roomNID)
+	if err != nil {
+		txn.Rollback() // nolint: errcheck
+		return nil, err
+	}
+	stateAndRefs, err := d.statements.bulkSelectStateAtEventAndReference(ctx, txn, eventNIDs)
+	if err != nil {
+		txn.Rollback() // nolint: errcheck
+		return nil, err
+	}
+	var lastEventIDSent string
+	if lastEventNIDSent != 0 {
+		lastEventIDSent, err = d.statements.selectEventID(ctx, txn, lastEventNIDSent)
+		if err != nil {
+			txn.Rollback() // nolint: errcheck
+			return nil, err
+		}
+	}
+	return &roomRecentEventsUpdater{
+		transaction{ctx, txn}, d, roomNID, stateAndRefs, lastEventIDSent, currentStateSnapshotNID,
+	}, nil
+}
+
+// GetTransactionEventID implements input.EventDatabase
+func (d *Database) GetTransactionEventID(
+	ctx context.Context, transactionID string,
+	sessionID int64, userID string,
+) (string, error) {
+	eventID, err := d.statements.selectTransactionEventID(ctx, transactionID, sessionID, userID)
+	if err == sql.ErrNoRows {
+		return "", nil
+	}
+	return eventID, err
+}
+
+type roomRecentEventsUpdater struct {
+	transaction
+	d                       *Database
+	roomNID                 types.RoomNID
+	latestEvents            []types.StateAtEventAndReference
+	lastEventIDSent         string
+	currentStateSnapshotNID types.StateSnapshotNID
+}
+
+// LatestEvents implements types.RoomRecentEventsUpdater
+func (u *roomRecentEventsUpdater) LatestEvents() []types.StateAtEventAndReference {
+	return u.latestEvents
+}
+
+// LastEventIDSent implements types.RoomRecentEventsUpdater
+func (u *roomRecentEventsUpdater) LastEventIDSent() string {
+	return u.lastEventIDSent
+}
+
+// CurrentStateSnapshotNID implements types.RoomRecentEventsUpdater
+func (u *roomRecentEventsUpdater) CurrentStateSnapshotNID() types.StateSnapshotNID {
+	return u.currentStateSnapshotNID
+}
+
+// StorePreviousEvents implements types.RoomRecentEventsUpdater
+func (u *roomRecentEventsUpdater) StorePreviousEvents(eventNID types.EventNID, previousEventReferences []gomatrixserverlib.EventReference) error {
+	for _, ref := range previousEventReferences {
+		if err := u.d.statements.insertPreviousEvent(u.ctx, u.txn, ref.EventID, ref.EventSHA256, eventNID); err != nil {
+			return err
+		}
+	}
+	return nil
+}
+
+// IsReferenced implements types.RoomRecentEventsUpdater
+func (u *roomRecentEventsUpdater) IsReferenced(eventReference gomatrixserverlib.EventReference) (bool, error) {
+	err := u.d.statements.selectPreviousEventExists(u.ctx, u.txn, eventReference.EventID, eventReference.EventSHA256)
+	if err == nil {
+		return true, nil
+	}
+	if err == sql.ErrNoRows {
+		return false, nil
+	}
+	return false, err
+}
+
+// SetLatestEvents implements types.RoomRecentEventsUpdater
+func (u *roomRecentEventsUpdater) SetLatestEvents(
+	roomNID types.RoomNID, latest []types.StateAtEventAndReference, lastEventNIDSent types.EventNID,
+	currentStateSnapshotNID types.StateSnapshotNID,
+) error {
+	eventNIDs := make([]types.EventNID, len(latest))
+	for i := range latest {
+		eventNIDs[i] = latest[i].EventNID
+	}
+	return u.d.statements.updateLatestEventNIDs(u.ctx, u.txn, roomNID, eventNIDs, lastEventNIDSent, currentStateSnapshotNID)
+}
+
+// HasEventBeenSent implements types.RoomRecentEventsUpdater
+func (u *roomRecentEventsUpdater) HasEventBeenSent(eventNID types.EventNID) (bool, error) {
+	return u.d.statements.selectEventSentToOutput(u.ctx, u.txn, eventNID)
+}
+
+// MarkEventAsSent implements types.RoomRecentEventsUpdater
+func (u *roomRecentEventsUpdater) MarkEventAsSent(eventNID types.EventNID) error {
+	return u.d.statements.updateEventSentToOutput(u.ctx, u.txn, eventNID)
+}
+
+func (u *roomRecentEventsUpdater) MembershipUpdater(targetUserNID types.EventStateKeyNID) (types.MembershipUpdater, error) {
+	return u.d.membershipUpdaterTxn(u.ctx, u.txn, u.roomNID, targetUserNID)
+}
+
+// RoomNID implements query.RoomserverQueryAPIDB
+func (d *Database) RoomNID(ctx context.Context, roomID string) (types.RoomNID, error) {
+	roomNID, err := d.statements.selectRoomNID(ctx, nil, roomID)
+	if err == sql.ErrNoRows {
+		return 0, nil
+	}
+	return roomNID, err
+}
+
+// LatestEventIDs implements query.RoomserverQueryAPIDatabase
+func (d *Database) LatestEventIDs(
+	ctx context.Context, roomNID types.RoomNID,
+) ([]gomatrixserverlib.EventReference, types.StateSnapshotNID, int64, error) {
+	eventNIDs, currentStateSnapshotNID, err := d.statements.selectLatestEventNIDs(ctx, roomNID)
+	if err != nil {
+		return nil, 0, 0, err
+	}
+	references, err := d.statements.bulkSelectEventReference(ctx, eventNIDs)
+	if err != nil {
+		return nil, 0, 0, err
+	}
+	depth, err := d.statements.selectMaxEventDepth(ctx, eventNIDs)
+	if err != nil {
+		return nil, 0, 0, err
+	}
+	return references, currentStateSnapshotNID, depth, nil
+}
+
+// GetInvitesForUser implements query.RoomserverQueryAPIDatabase
+func (d *Database) GetInvitesForUser(
+	ctx context.Context,
+	roomNID types.RoomNID,
+	targetUserNID types.EventStateKeyNID,
+) (senderUserIDs []types.EventStateKeyNID, err error) {
+	return d.statements.selectInviteActiveForUserInRoom(ctx, targetUserNID, roomNID)
+}
+
+// SetRoomAlias implements alias.RoomserverAliasAPIDB
+func (d *Database) SetRoomAlias(ctx context.Context, alias string, roomID string, creatorUserID string) error {
+	return d.statements.insertRoomAlias(ctx, alias, roomID, creatorUserID)
+}
+
+// GetRoomIDForAlias implements alias.RoomserverAliasAPIDB
+func (d *Database) GetRoomIDForAlias(ctx context.Context, alias string) (string, error) {
+	return d.statements.selectRoomIDFromAlias(ctx, alias)
+}
+
+// GetAliasesForRoomID implements alias.RoomserverAliasAPIDB
+func (d *Database) GetAliasesForRoomID(ctx context.Context, roomID string) ([]string, error) {
+	return d.statements.selectAliasesFromRoomID(ctx, roomID)
+}
+
+// GetCreatorIDForAlias implements alias.RoomserverAliasAPIDB
+func (d *Database) GetCreatorIDForAlias(
+	ctx context.Context, alias string,
+) (string, error) {
+	return d.statements.selectCreatorIDFromAlias(ctx, alias)
+}
+
+// RemoveRoomAlias implements alias.RoomserverAliasAPIDB
+func (d *Database) RemoveRoomAlias(ctx context.Context, alias string) error {
+	return d.statements.deleteRoomAlias(ctx, alias)
+}
+
+// StateEntriesForTuples implements state.RoomStateDatabase
+func (d *Database) StateEntriesForTuples(
+	ctx context.Context,
+	stateBlockNIDs []types.StateBlockNID,
+	stateKeyTuples []types.StateKeyTuple,
+) ([]types.StateEntryList, error) {
+	return d.statements.bulkSelectFilteredStateBlockEntries(
+		ctx, stateBlockNIDs, stateKeyTuples,
+	)
+}
+
+// MembershipUpdater implements input.RoomEventDatabase
+func (d *Database) MembershipUpdater(
+	ctx context.Context, roomID, targetUserID string,
+) (types.MembershipUpdater, error) {
+	txn, err := d.db.Begin()
+	if err != nil {
+		return nil, err
+	}
+	succeeded := false
+	defer func() {
+		if !succeeded {
+			txn.Rollback() // nolint: errcheck
+		}
+	}()
+
+	roomNID, err := d.assignRoomNID(ctx, txn, roomID)
+	if err != nil {
+		return nil, err
+	}
+
+	targetUserNID, err := d.assignStateKeyNID(ctx, txn, targetUserID)
+	if err != nil {
+		return nil, err
+	}
+
+	updater, err := d.membershipUpdaterTxn(ctx, txn, roomNID, targetUserNID)
+	if err != nil {
+		return nil, err
+	}
+
+	succeeded = true
+	return updater, nil
+}
+
+type membershipUpdater struct {
+	transaction
+	d             *Database
+	roomNID       types.RoomNID
+	targetUserNID types.EventStateKeyNID
+	membership    membershipState
+}
+
+func (d *Database) membershipUpdaterTxn(
+	ctx context.Context,
+	txn *sql.Tx,
+	roomNID types.RoomNID,
+	targetUserNID types.EventStateKeyNID,
+) (types.MembershipUpdater, error) {
+
+	if err := d.statements.insertMembership(ctx, txn, roomNID, targetUserNID); err != nil {
+		return nil, err
+	}
+
+	membership, err := d.statements.selectMembershipForUpdate(ctx, txn, roomNID, targetUserNID)
+	if err != nil {
+		return nil, err
+	}
+
+	return &membershipUpdater{
+		transaction{ctx, txn}, d, roomNID, targetUserNID, membership,
+	}, nil
+}
+
+// IsInvite implements types.MembershipUpdater
+func (u *membershipUpdater) IsInvite() bool {
+	return u.membership == membershipStateInvite
+}
+
+// IsJoin implements types.MembershipUpdater
+func (u *membershipUpdater) IsJoin() bool {
+	return u.membership == membershipStateJoin
+}
+
+// IsLeave implements types.MembershipUpdater
+func (u *membershipUpdater) IsLeave() bool {
+	return u.membership == membershipStateLeaveOrBan
+}
+
+// SetToInvite implements types.MembershipUpdater
+func (u *membershipUpdater) SetToInvite(event gomatrixserverlib.Event) (bool, error) {
+	senderUserNID, err := u.d.assignStateKeyNID(u.ctx, u.txn, event.Sender())
+	if err != nil {
+		return false, err
+	}
+	inserted, err := u.d.statements.insertInviteEvent(
+		u.ctx, u.txn, event.EventID(), u.roomNID, u.targetUserNID, senderUserNID, event.JSON(),
+	)
+	if err != nil {
+		return false, err
+	}
+	if u.membership != membershipStateInvite {
+		if err = u.d.statements.updateMembership(
+			u.ctx, u.txn, u.roomNID, u.targetUserNID, senderUserNID, membershipStateInvite, 0,
+		); err != nil {
+			return false, err
+		}
+	}
+	return inserted, nil
+}
+
+// SetToJoin implements types.MembershipUpdater
+func (u *membershipUpdater) SetToJoin(senderUserID string, eventID string, isUpdate bool) ([]string, error) {
+	var inviteEventIDs []string
+
+	senderUserNID, err := u.d.assignStateKeyNID(u.ctx, u.txn, senderUserID)
+	if err != nil {
+		return nil, err
+	}
+
+	// If this is a join event update, there is no invite to update
+	if !isUpdate {
+		inviteEventIDs, err = u.d.statements.updateInviteRetired(
+			u.ctx, u.txn, u.roomNID, u.targetUserNID,
+		)
+		if err != nil {
+			return nil, err
+		}
+	}
+
+	// Look up the NID of the new join event
+	nIDs, err := u.d.EventNIDs(u.ctx, []string{eventID})
+	if err != nil {
+		return nil, err
+	}
+
+	if u.membership != membershipStateJoin || isUpdate {
+		if err = u.d.statements.updateMembership(
+			u.ctx, u.txn, u.roomNID, u.targetUserNID, senderUserNID,
+			membershipStateJoin, nIDs[eventID],
+		); err != nil {
+			return nil, err
+		}
+	}
+
+	return inviteEventIDs, nil
+}
+
+// SetToLeave implements types.MembershipUpdater
+func (u *membershipUpdater) SetToLeave(senderUserID string, eventID string) ([]string, error) {
+	senderUserNID, err := u.d.assignStateKeyNID(u.ctx, u.txn, senderUserID)
+	if err != nil {
+		return nil, err
+	}
+	inviteEventIDs, err := u.d.statements.updateInviteRetired(
+		u.ctx, u.txn, u.roomNID, u.targetUserNID,
+	)
+	if err != nil {
+		return nil, err
+	}
+
+	// Look up the NID of the new leave event
+	nIDs, err := u.d.EventNIDs(u.ctx, []string{eventID})
+	if err != nil {
+		return nil, err
+	}
+
+	if u.membership != membershipStateLeaveOrBan {
+		if err = u.d.statements.updateMembership(
+			u.ctx, u.txn, u.roomNID, u.targetUserNID, senderUserNID,
+			membershipStateLeaveOrBan, nIDs[eventID],
+		); err != nil {
+			return nil, err
+		}
+	}
+	return inviteEventIDs, nil
+}
+
+// GetMembership implements query.RoomserverQueryAPIDB
+func (d *Database) GetMembership(
+	ctx context.Context, roomNID types.RoomNID, requestSenderUserID string,
+) (membershipEventNID types.EventNID, stillInRoom bool, err error) {
+	requestSenderUserNID, err := d.assignStateKeyNID(ctx, nil, requestSenderUserID)
+	if err != nil {
+		return
+	}
+
+	senderMembershipEventNID, senderMembership, err :=
+		d.statements.selectMembershipFromRoomAndTarget(
+			ctx, roomNID, requestSenderUserNID,
+		)
+	if err == sql.ErrNoRows {
+		// The user has never been a member of that room
+		return 0, false, nil
+	} else if err != nil {
+		return
+	}
+
+	return senderMembershipEventNID, senderMembership == membershipStateJoin, nil
+}
+
+// GetMembershipEventNIDsForRoom implements query.RoomserverQueryAPIDB
+func (d *Database) GetMembershipEventNIDsForRoom(
+	ctx context.Context, roomNID types.RoomNID, joinOnly bool,
+) ([]types.EventNID, error) {
+	if joinOnly {
+		return d.statements.selectMembershipsFromRoomAndMembership(
+			ctx, roomNID, membershipStateJoin,
+		)
+	}
+
+	return d.statements.selectMembershipsFromRoom(ctx, roomNID)
+}
+
+// EventsFromIDs implements query.RoomserverQueryAPIEventDB
+func (d *Database) EventsFromIDs(ctx context.Context, eventIDs []string) ([]types.Event, error) {
+	nidMap, err := d.EventNIDs(ctx, eventIDs)
+	if err != nil {
+		return nil, err
+	}
+
+	var nids []types.EventNID
+	for _, nid := range nidMap {
+		nids = append(nids, nid)
+	}
+
+	return d.Events(ctx, nids)
+}
+
+type transaction struct {
+	ctx context.Context
+	txn *sql.Tx
+}
+
+// Commit implements types.Transaction
+func (t *transaction) Commit() error {
+	return t.txn.Commit()
+}
+
+// Rollback implements types.Transaction
+func (t *transaction) Rollback() error {
+	return t.txn.Rollback()
+}
diff --git a/roomserver/storage/transactions_table.go b/roomserver/storage/postgres/transactions_table.go
index b98ea3f3..87c1caca 100644
--- a/roomserver/storage/transactions_table.go
+++ b/roomserver/storage/postgres/transactions_table.go
@@ -1,3 +1,6 @@
+// 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
@@ -10,7 +13,7 @@
 // See the License for the specific language governing permissions and
 // limitations under the License.
 
-package storage
+package postgres
 
 import (
 	"context"
diff --git a/roomserver/storage/storage.go b/roomserver/storage/storage.go
index 7e8eb98c..325d96e9 100644
--- a/roomserver/storage/storage.go
+++ b/roomserver/storage/storage.go
@@ -1,4 +1,4 @@
-// Copyright 2017 Vector Creations Ltd
+// Copyright 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.
@@ -16,697 +16,57 @@ package storage
 
 import (
 	"context"
-	"database/sql"
+	"errors"
+	"net/url"
 
-	// Import the postgres database driver.
-	_ "github.com/lib/pq"
 	"github.com/matrix-org/dendrite/roomserver/api"
+	"github.com/matrix-org/dendrite/roomserver/storage/postgres"
 	"github.com/matrix-org/dendrite/roomserver/types"
 	"github.com/matrix-org/gomatrixserverlib"
 )
 
-// A Database is used to store room events and stream offsets.
-type Database struct {
-	statements statements
-	db         *sql.DB
-}
-
-// Open a postgres database.
-func Open(dataSourceName string) (*Database, error) {
-	var d Database
-	var err error
-	if d.db, err = sql.Open("postgres", dataSourceName); err != nil {
-		return nil, err
-	}
-	if err = d.statements.prepare(d.db); err != nil {
-		return nil, err
-	}
-	return &d, nil
-}
-
-// StoreEvent implements input.EventDatabase
-func (d *Database) StoreEvent(
-	ctx context.Context, event gomatrixserverlib.Event,
-	txnAndSessionID *api.TransactionID, authEventNIDs []types.EventNID,
-) (types.RoomNID, types.StateAtEvent, error) {
-	var (
-		roomNID          types.RoomNID
-		eventTypeNID     types.EventTypeNID
-		eventStateKeyNID types.EventStateKeyNID
-		eventNID         types.EventNID
-		stateNID         types.StateSnapshotNID
-		err              error
-	)
-
-	if txnAndSessionID != nil {
-		if err = d.statements.insertTransaction(
-			ctx, txnAndSessionID.TransactionID,
-			txnAndSessionID.SessionID, event.Sender(), event.EventID(),
-		); err != nil {
-			return 0, types.StateAtEvent{}, err
-		}
-	}
-
-	if roomNID, err = d.assignRoomNID(ctx, nil, event.RoomID()); err != nil {
-		return 0, types.StateAtEvent{}, err
-	}
-
-	if eventTypeNID, err = d.assignEventTypeNID(ctx, event.Type()); err != nil {
-		return 0, types.StateAtEvent{}, err
-	}
-
-	eventStateKey := event.StateKey()
-	// Assigned a numeric ID for the state_key if there is one present.
-	// Otherwise set the numeric ID for the state_key to 0.
-	if eventStateKey != nil {
-		if eventStateKeyNID, err = d.assignStateKeyNID(ctx, nil, *eventStateKey); err != nil {
-			return 0, types.StateAtEvent{}, err
-		}
-	}
-
-	if eventNID, stateNID, err = d.statements.insertEvent(
-		ctx,
-		roomNID,
-		eventTypeNID,
-		eventStateKeyNID,
-		event.EventID(),
-		event.EventReference().EventSHA256,
-		authEventNIDs,
-		event.Depth(),
-	); err != nil {
-		if err == sql.ErrNoRows {
-			// We've already inserted the event so select the numeric event ID
-			eventNID, stateNID, err = d.statements.selectEvent(ctx, event.EventID())
-		}
-		if err != nil {
-			return 0, types.StateAtEvent{}, err
-		}
-	}
-
-	if err = d.statements.insertEventJSON(ctx, eventNID, event.JSON()); err != nil {
-		return 0, types.StateAtEvent{}, err
-	}
-
-	return roomNID, types.StateAtEvent{
-		BeforeStateSnapshotNID: stateNID,
-		StateEntry: types.StateEntry{
-			StateKeyTuple: types.StateKeyTuple{
-				EventTypeNID:     eventTypeNID,
-				EventStateKeyNID: eventStateKeyNID,
-			},
-			EventNID: eventNID,
-		},
-	}, nil
-}
-
-func (d *Database) assignRoomNID(
-	ctx context.Context, txn *sql.Tx, roomID string,
-) (types.RoomNID, error) {
-	// Check if we already have a numeric ID in the database.
-	roomNID, err := d.statements.selectRoomNID(ctx, txn, roomID)
-	if err == sql.ErrNoRows {
-		// We don't have a numeric ID so insert one into the database.
-		roomNID, err = d.statements.insertRoomNID(ctx, txn, roomID)
-		if err == sql.ErrNoRows {
-			// We raced with another insert so run the select again.
-			roomNID, err = d.statements.selectRoomNID(ctx, txn, roomID)
-		}
-	}
-	return roomNID, err
-}
-
-func (d *Database) assignEventTypeNID(
-	ctx context.Context, eventType string,
-) (types.EventTypeNID, error) {
-	// Check if we already have a numeric ID in the database.
-	eventTypeNID, err := d.statements.selectEventTypeNID(ctx, eventType)
-	if err == sql.ErrNoRows {
-		// We don't have a numeric ID so insert one into the database.
-		eventTypeNID, err = d.statements.insertEventTypeNID(ctx, eventType)
-		if err == sql.ErrNoRows {
-			// We raced with another insert so run the select again.
-			eventTypeNID, err = d.statements.selectEventTypeNID(ctx, eventType)
-		}
-	}
-	return eventTypeNID, err
-}
-
-func (d *Database) assignStateKeyNID(
-	ctx context.Context, txn *sql.Tx, eventStateKey string,
-) (types.EventStateKeyNID, error) {
-	// Check if we already have a numeric ID in the database.
-	eventStateKeyNID, err := d.statements.selectEventStateKeyNID(ctx, txn, eventStateKey)
-	if err == sql.ErrNoRows {
-		// We don't have a numeric ID so insert one into the database.
-		eventStateKeyNID, err = d.statements.insertEventStateKeyNID(ctx, txn, eventStateKey)
-		if err == sql.ErrNoRows {
-			// We raced with another insert so run the select again.
-			eventStateKeyNID, err = d.statements.selectEventStateKeyNID(ctx, txn, eventStateKey)
-		}
-	}
-	return eventStateKeyNID, err
-}
-
-// StateEntriesForEventIDs implements input.EventDatabase
-func (d *Database) StateEntriesForEventIDs(
-	ctx context.Context, eventIDs []string,
-) ([]types.StateEntry, error) {
-	return d.statements.bulkSelectStateEventByID(ctx, eventIDs)
-}
-
-// EventTypeNIDs implements state.RoomStateDatabase
-func (d *Database) EventTypeNIDs(
-	ctx context.Context, eventTypes []string,
-) (map[string]types.EventTypeNID, error) {
-	return d.statements.bulkSelectEventTypeNID(ctx, eventTypes)
-}
-
-// EventStateKeyNIDs implements state.RoomStateDatabase
-func (d *Database) EventStateKeyNIDs(
-	ctx context.Context, eventStateKeys []string,
-) (map[string]types.EventStateKeyNID, error) {
-	return d.statements.bulkSelectEventStateKeyNID(ctx, eventStateKeys)
-}
-
-// EventStateKeys implements query.RoomserverQueryAPIDatabase
-func (d *Database) EventStateKeys(
-	ctx context.Context, eventStateKeyNIDs []types.EventStateKeyNID,
-) (map[types.EventStateKeyNID]string, error) {
-	return d.statements.bulkSelectEventStateKey(ctx, eventStateKeyNIDs)
-}
-
-// EventNIDs implements query.RoomserverQueryAPIDatabase
-func (d *Database) EventNIDs(
-	ctx context.Context, eventIDs []string,
-) (map[string]types.EventNID, error) {
-	return d.statements.bulkSelectEventNID(ctx, eventIDs)
-}
-
-// Events implements input.EventDatabase
-func (d *Database) Events(
-	ctx context.Context, eventNIDs []types.EventNID,
-) ([]types.Event, error) {
-	eventJSONs, err := d.statements.bulkSelectEventJSON(ctx, eventNIDs)
-	if err != nil {
-		return nil, err
-	}
-	results := make([]types.Event, len(eventJSONs))
-	for i, eventJSON := range eventJSONs {
-		result := &results[i]
-		result.EventNID = eventJSON.EventNID
-		// TODO: Use NewEventFromTrustedJSON for efficiency
-		result.Event, err = gomatrixserverlib.NewEventFromUntrustedJSON(eventJSON.EventJSON)
-		if err != nil {
-			return nil, err
-		}
-	}
-	return results, nil
-}
-
-// AddState implements input.EventDatabase
-func (d *Database) AddState(
-	ctx context.Context,
-	roomNID types.RoomNID,
-	stateBlockNIDs []types.StateBlockNID,
-	state []types.StateEntry,
-) (types.StateSnapshotNID, error) {
-	if len(state) > 0 {
-		stateBlockNID, err := d.statements.selectNextStateBlockNID(ctx)
-		if err != nil {
-			return 0, err
-		}
-		if err = d.statements.bulkInsertStateData(ctx, stateBlockNID, state); err != nil {
-			return 0, err
-		}
-		stateBlockNIDs = append(stateBlockNIDs[:len(stateBlockNIDs):len(stateBlockNIDs)], stateBlockNID)
-	}
-
-	return d.statements.insertState(ctx, roomNID, stateBlockNIDs)
-}
-
-// SetState implements input.EventDatabase
-func (d *Database) SetState(
-	ctx context.Context, eventNID types.EventNID, stateNID types.StateSnapshotNID,
-) error {
-	return d.statements.updateEventState(ctx, eventNID, stateNID)
-}
-
-// StateAtEventIDs implements input.EventDatabase
-func (d *Database) StateAtEventIDs(
-	ctx context.Context, eventIDs []string,
-) ([]types.StateAtEvent, error) {
-	return d.statements.bulkSelectStateAtEventByID(ctx, eventIDs)
-}
-
-// StateBlockNIDs implements state.RoomStateDatabase
-func (d *Database) StateBlockNIDs(
-	ctx context.Context, stateNIDs []types.StateSnapshotNID,
-) ([]types.StateBlockNIDList, error) {
-	return d.statements.bulkSelectStateBlockNIDs(ctx, stateNIDs)
-}
-
-// StateEntries implements state.RoomStateDatabase
-func (d *Database) StateEntries(
-	ctx context.Context, stateBlockNIDs []types.StateBlockNID,
-) ([]types.StateEntryList, error) {
-	return d.statements.bulkSelectStateBlockEntries(ctx, stateBlockNIDs)
-}
-
-// SnapshotNIDFromEventID implements state.RoomStateDatabase
-func (d *Database) SnapshotNIDFromEventID(
-	ctx context.Context, eventID string,
-) (types.StateSnapshotNID, error) {
-	_, stateNID, err := d.statements.selectEvent(ctx, eventID)
-	return stateNID, err
-}
-
-// EventIDs implements input.RoomEventDatabase
-func (d *Database) EventIDs(
-	ctx context.Context, eventNIDs []types.EventNID,
-) (map[types.EventNID]string, error) {
-	return d.statements.bulkSelectEventID(ctx, eventNIDs)
-}
-
-// GetLatestEventsForUpdate implements input.EventDatabase
-func (d *Database) GetLatestEventsForUpdate(
-	ctx context.Context, roomNID types.RoomNID,
-) (types.RoomRecentEventsUpdater, error) {
-	txn, err := d.db.Begin()
-	if err != nil {
-		return nil, err
-	}
-	eventNIDs, lastEventNIDSent, currentStateSnapshotNID, err :=
-		d.statements.selectLatestEventsNIDsForUpdate(ctx, txn, roomNID)
-	if err != nil {
-		txn.Rollback() // nolint: errcheck
-		return nil, err
-	}
-	stateAndRefs, err := d.statements.bulkSelectStateAtEventAndReference(ctx, txn, eventNIDs)
-	if err != nil {
-		txn.Rollback() // nolint: errcheck
-		return nil, err
-	}
-	var lastEventIDSent string
-	if lastEventNIDSent != 0 {
-		lastEventIDSent, err = d.statements.selectEventID(ctx, txn, lastEventNIDSent)
-		if err != nil {
-			txn.Rollback() // nolint: errcheck
-			return nil, err
-		}
-	}
-	return &roomRecentEventsUpdater{
-		transaction{ctx, txn}, d, roomNID, stateAndRefs, lastEventIDSent, currentStateSnapshotNID,
-	}, nil
-}
-
-// GetTransactionEventID implements input.EventDatabase
-func (d *Database) GetTransactionEventID(
-	ctx context.Context, transactionID string,
-	sessionID int64, userID string,
-) (string, error) {
-	eventID, err := d.statements.selectTransactionEventID(ctx, transactionID, sessionID, userID)
-	if err == sql.ErrNoRows {
-		return "", nil
-	}
-	return eventID, err
-}
-
-type roomRecentEventsUpdater struct {
-	transaction
-	d                       *Database
-	roomNID                 types.RoomNID
-	latestEvents            []types.StateAtEventAndReference
-	lastEventIDSent         string
-	currentStateSnapshotNID types.StateSnapshotNID
-}
-
-// LatestEvents implements types.RoomRecentEventsUpdater
-func (u *roomRecentEventsUpdater) LatestEvents() []types.StateAtEventAndReference {
-	return u.latestEvents
-}
-
-// LastEventIDSent implements types.RoomRecentEventsUpdater
-func (u *roomRecentEventsUpdater) LastEventIDSent() string {
-	return u.lastEventIDSent
-}
-
-// CurrentStateSnapshotNID implements types.RoomRecentEventsUpdater
-func (u *roomRecentEventsUpdater) CurrentStateSnapshotNID() types.StateSnapshotNID {
-	return u.currentStateSnapshotNID
-}
-
-// StorePreviousEvents implements types.RoomRecentEventsUpdater
-func (u *roomRecentEventsUpdater) StorePreviousEvents(eventNID types.EventNID, previousEventReferences []gomatrixserverlib.EventReference) error {
-	for _, ref := range previousEventReferences {
-		if err := u.d.statements.insertPreviousEvent(u.ctx, u.txn, ref.EventID, ref.EventSHA256, eventNID); err != nil {
-			return err
-		}
-	}
-	return nil
-}
-
-// IsReferenced implements types.RoomRecentEventsUpdater
-func (u *roomRecentEventsUpdater) IsReferenced(eventReference gomatrixserverlib.EventReference) (bool, error) {
-	err := u.d.statements.selectPreviousEventExists(u.ctx, u.txn, eventReference.EventID, eventReference.EventSHA256)
-	if err == nil {
-		return true, nil
-	}
-	if err == sql.ErrNoRows {
-		return false, nil
-	}
-	return false, err
-}
-
-// SetLatestEvents implements types.RoomRecentEventsUpdater
-func (u *roomRecentEventsUpdater) SetLatestEvents(
-	roomNID types.RoomNID, latest []types.StateAtEventAndReference, lastEventNIDSent types.EventNID,
-	currentStateSnapshotNID types.StateSnapshotNID,
-) error {
-	eventNIDs := make([]types.EventNID, len(latest))
-	for i := range latest {
-		eventNIDs[i] = latest[i].EventNID
-	}
-	return u.d.statements.updateLatestEventNIDs(u.ctx, u.txn, roomNID, eventNIDs, lastEventNIDSent, currentStateSnapshotNID)
-}
-
-// HasEventBeenSent implements types.RoomRecentEventsUpdater
-func (u *roomRecentEventsUpdater) HasEventBeenSent(eventNID types.EventNID) (bool, error) {
-	return u.d.statements.selectEventSentToOutput(u.ctx, u.txn, eventNID)
-}
-
-// MarkEventAsSent implements types.RoomRecentEventsUpdater
-func (u *roomRecentEventsUpdater) MarkEventAsSent(eventNID types.EventNID) error {
-	return u.d.statements.updateEventSentToOutput(u.ctx, u.txn, eventNID)
-}
-
-func (u *roomRecentEventsUpdater) MembershipUpdater(targetUserNID types.EventStateKeyNID) (types.MembershipUpdater, error) {
-	return u.d.membershipUpdaterTxn(u.ctx, u.txn, u.roomNID, targetUserNID)
-}
-
-// RoomNID implements query.RoomserverQueryAPIDB
-func (d *Database) RoomNID(ctx context.Context, roomID string) (types.RoomNID, error) {
-	roomNID, err := d.statements.selectRoomNID(ctx, nil, roomID)
-	if err == sql.ErrNoRows {
-		return 0, nil
-	}
-	return roomNID, err
-}
-
-// LatestEventIDs implements query.RoomserverQueryAPIDatabase
-func (d *Database) LatestEventIDs(
-	ctx context.Context, roomNID types.RoomNID,
-) ([]gomatrixserverlib.EventReference, types.StateSnapshotNID, int64, error) {
-	eventNIDs, currentStateSnapshotNID, err := d.statements.selectLatestEventNIDs(ctx, roomNID)
-	if err != nil {
-		return nil, 0, 0, err
-	}
-	references, err := d.statements.bulkSelectEventReference(ctx, eventNIDs)
-	if err != nil {
-		return nil, 0, 0, err
-	}
-	depth, err := d.statements.selectMaxEventDepth(ctx, eventNIDs)
-	if err != nil {
-		return nil, 0, 0, err
+type Database interface {
+	StoreEvent(ctx context.Context, event gomatrixserverlib.Event, txnAndSessionID *api.TransactionID, authEventNIDs []types.EventNID) (types.RoomNID, types.StateAtEvent, error)
+	StateEntriesForEventIDs(ctx context.Context, eventIDs []string) ([]types.StateEntry, error)
+	EventTypeNIDs(ctx context.Context, eventTypes []string) (map[string]types.EventTypeNID, error)
+	EventStateKeyNIDs(ctx context.Context, eventStateKeys []string) (map[string]types.EventStateKeyNID, error)
+	EventStateKeys(ctx context.Context, eventStateKeyNIDs []types.EventStateKeyNID) (map[types.EventStateKeyNID]string, error)
+	EventNIDs(ctx context.Context, eventIDs []string) (map[string]types.EventNID, error)
+	Events(ctx context.Context, eventNIDs []types.EventNID) ([]types.Event, error)
+	AddState(ctx context.Context, roomNID types.RoomNID, stateBlockNIDs []types.StateBlockNID, state []types.StateEntry) (types.StateSnapshotNID, error)
+	SetState(ctx context.Context, eventNID types.EventNID, stateNID types.StateSnapshotNID) error
+	StateAtEventIDs(ctx context.Context, eventIDs []string) ([]types.StateAtEvent, error)
+	StateBlockNIDs(ctx context.Context, stateNIDs []types.StateSnapshotNID) ([]types.StateBlockNIDList, error)
+	StateEntries(ctx context.Context, stateBlockNIDs []types.StateBlockNID) ([]types.StateEntryList, error)
+	SnapshotNIDFromEventID(ctx context.Context, eventID string) (types.StateSnapshotNID, error)
+	EventIDs(ctx context.Context, eventNIDs []types.EventNID) (map[types.EventNID]string, error)
+	GetLatestEventsForUpdate(ctx context.Context, roomNID types.RoomNID) (types.RoomRecentEventsUpdater, error)
+	GetTransactionEventID(ctx context.Context, transactionID string, sessionID int64, userID string) (string, error)
+	RoomNID(ctx context.Context, roomID string) (types.RoomNID, error)
+	LatestEventIDs(ctx context.Context, roomNID types.RoomNID) ([]gomatrixserverlib.EventReference, types.StateSnapshotNID, int64, error)
+	GetInvitesForUser(ctx context.Context, roomNID types.RoomNID, targetUserNID types.EventStateKeyNID) (senderUserIDs []types.EventStateKeyNID, err error)
+	SetRoomAlias(ctx context.Context, alias string, roomID string, creatorUserID string) error
+	GetRoomIDForAlias(ctx context.Context, alias string) (string, error)
+	GetAliasesForRoomID(ctx context.Context, roomID string) ([]string, error)
+	GetCreatorIDForAlias(ctx context.Context, alias string) (string, error)
+	RemoveRoomAlias(ctx context.Context, alias string) error
+	StateEntriesForTuples(ctx context.Context, stateBlockNIDs []types.StateBlockNID, stateKeyTuples []types.StateKeyTuple) ([]types.StateEntryList, error)
+	MembershipUpdater(ctx context.Context, roomID, targetUserID string) (types.MembershipUpdater, error)
+	GetMembership(ctx context.Context, roomNID types.RoomNID, requestSenderUserID string) (membershipEventNID types.EventNID, stillInRoom bool, err error)
+	GetMembershipEventNIDsForRoom(ctx context.Context, roomNID types.RoomNID, joinOnly bool) ([]types.EventNID, error)
+	EventsFromIDs(ctx context.Context, eventIDs []string) ([]types.Event, error)
+}
+
+// NewPublicRoomsServerDatabase opens a database connection.
+func Open(dataSourceName string) (Database, error) {
+	uri, err := url.Parse(dataSourceName)
+	if err != nil {
+		return nil, err
+	}
+	switch uri.Scheme {
+	case "postgres":
+		return postgres.Open(dataSourceName)
+	default:
+		return nil, errors.New("unknown schema")
 	}
-	return references, currentStateSnapshotNID, depth, nil
-}
-
-// GetInvitesForUser implements query.RoomserverQueryAPIDatabase
-func (d *Database) GetInvitesForUser(
-	ctx context.Context,
-	roomNID types.RoomNID,
-	targetUserNID types.EventStateKeyNID,
-) (senderUserIDs []types.EventStateKeyNID, err error) {
-	return d.statements.selectInviteActiveForUserInRoom(ctx, targetUserNID, roomNID)
-}
-
-// SetRoomAlias implements alias.RoomserverAliasAPIDB
-func (d *Database) SetRoomAlias(ctx context.Context, alias string, roomID string, creatorUserID string) error {
-	return d.statements.insertRoomAlias(ctx, alias, roomID, creatorUserID)
-}
-
-// GetRoomIDForAlias implements alias.RoomserverAliasAPIDB
-func (d *Database) GetRoomIDForAlias(ctx context.Context, alias string) (string, error) {
-	return d.statements.selectRoomIDFromAlias(ctx, alias)
-}
-
-// GetAliasesForRoomID implements alias.RoomserverAliasAPIDB
-func (d *Database) GetAliasesForRoomID(ctx context.Context, roomID string) ([]string, error) {
-	return d.statements.selectAliasesFromRoomID(ctx, roomID)
-}
-
-// GetCreatorIDForAlias implements alias.RoomserverAliasAPIDB
-func (d *Database) GetCreatorIDForAlias(
-	ctx context.Context, alias string,
-) (string, error) {
-	return d.statements.selectCreatorIDFromAlias(ctx, alias)
-}
-
-// RemoveRoomAlias implements alias.RoomserverAliasAPIDB
-func (d *Database) RemoveRoomAlias(ctx context.Context, alias string) error {
-	return d.statements.deleteRoomAlias(ctx, alias)
-}
-
-// StateEntriesForTuples implements state.RoomStateDatabase
-func (d *Database) StateEntriesForTuples(
-	ctx context.Context,
-	stateBlockNIDs []types.StateBlockNID,
-	stateKeyTuples []types.StateKeyTuple,
-) ([]types.StateEntryList, error) {
-	return d.statements.bulkSelectFilteredStateBlockEntries(
-		ctx, stateBlockNIDs, stateKeyTuples,
-	)
-}
-
-// MembershipUpdater implements input.RoomEventDatabase
-func (d *Database) MembershipUpdater(
-	ctx context.Context, roomID, targetUserID string,
-) (types.MembershipUpdater, error) {
-	txn, err := d.db.Begin()
-	if err != nil {
-		return nil, err
-	}
-	succeeded := false
-	defer func() {
-		if !succeeded {
-			txn.Rollback() // nolint: errcheck
-		}
-	}()
-
-	roomNID, err := d.assignRoomNID(ctx, txn, roomID)
-	if err != nil {
-		return nil, err
-	}
-
-	targetUserNID, err := d.assignStateKeyNID(ctx, txn, targetUserID)
-	if err != nil {
-		return nil, err
-	}
-
-	updater, err := d.membershipUpdaterTxn(ctx, txn, roomNID, targetUserNID)
-	if err != nil {
-		return nil, err
-	}
-
-	succeeded = true
-	return updater, nil
-}
-
-type membershipUpdater struct {
-	transaction
-	d             *Database
-	roomNID       types.RoomNID
-	targetUserNID types.EventStateKeyNID
-	membership    membershipState
-}
-
-func (d *Database) membershipUpdaterTxn(
-	ctx context.Context,
-	txn *sql.Tx,
-	roomNID types.RoomNID,
-	targetUserNID types.EventStateKeyNID,
-) (types.MembershipUpdater, error) {
-
-	if err := d.statements.insertMembership(ctx, txn, roomNID, targetUserNID); err != nil {
-		return nil, err
-	}
-
-	membership, err := d.statements.selectMembershipForUpdate(ctx, txn, roomNID, targetUserNID)
-	if err != nil {
-		return nil, err
-	}
-
-	return &membershipUpdater{
-		transaction{ctx, txn}, d, roomNID, targetUserNID, membership,
-	}, nil
-}
-
-// IsInvite implements types.MembershipUpdater
-func (u *membershipUpdater) IsInvite() bool {
-	return u.membership == membershipStateInvite
-}
-
-// IsJoin implements types.MembershipUpdater
-func (u *membershipUpdater) IsJoin() bool {
-	return u.membership == membershipStateJoin
-}
-
-// IsLeave implements types.MembershipUpdater
-func (u *membershipUpdater) IsLeave() bool {
-	return u.membership == membershipStateLeaveOrBan
-}
-
-// SetToInvite implements types.MembershipUpdater
-func (u *membershipUpdater) SetToInvite(event gomatrixserverlib.Event) (bool, error) {
-	senderUserNID, err := u.d.assignStateKeyNID(u.ctx, u.txn, event.Sender())
-	if err != nil {
-		return false, err
-	}
-	inserted, err := u.d.statements.insertInviteEvent(
-		u.ctx, u.txn, event.EventID(), u.roomNID, u.targetUserNID, senderUserNID, event.JSON(),
-	)
-	if err != nil {
-		return false, err
-	}
-	if u.membership != membershipStateInvite {
-		if err = u.d.statements.updateMembership(
-			u.ctx, u.txn, u.roomNID, u.targetUserNID, senderUserNID, membershipStateInvite, 0,
-		); err != nil {
-			return false, err
-		}
-	}
-	return inserted, nil
-}
-
-// SetToJoin implements types.MembershipUpdater
-func (u *membershipUpdater) SetToJoin(senderUserID string, eventID string, isUpdate bool) ([]string, error) {
-	var inviteEventIDs []string
-
-	senderUserNID, err := u.d.assignStateKeyNID(u.ctx, u.txn, senderUserID)
-	if err != nil {
-		return nil, err
-	}
-
-	// If this is a join event update, there is no invite to update
-	if !isUpdate {
-		inviteEventIDs, err = u.d.statements.updateInviteRetired(
-			u.ctx, u.txn, u.roomNID, u.targetUserNID,
-		)
-		if err != nil {
-			return nil, err
-		}
-	}
-
-	// Look up the NID of the new join event
-	nIDs, err := u.d.EventNIDs(u.ctx, []string{eventID})
-	if err != nil {
-		return nil, err
-	}
-
-	if u.membership != membershipStateJoin || isUpdate {
-		if err = u.d.statements.updateMembership(
-			u.ctx, u.txn, u.roomNID, u.targetUserNID, senderUserNID,
-			membershipStateJoin, nIDs[eventID],
-		); err != nil {
-			return nil, err
-		}
-	}
-
-	return inviteEventIDs, nil
-}
-
-// SetToLeave implements types.MembershipUpdater
-func (u *membershipUpdater) SetToLeave(senderUserID string, eventID string) ([]string, error) {
-	senderUserNID, err := u.d.assignStateKeyNID(u.ctx, u.txn, senderUserID)
-	if err != nil {
-		return nil, err
-	}
-	inviteEventIDs, err := u.d.statements.updateInviteRetired(
-		u.ctx, u.txn, u.roomNID, u.targetUserNID,
-	)
-	if err != nil {
-		return nil, err
-	}
-
-	// Look up the NID of the new leave event
-	nIDs, err := u.d.EventNIDs(u.ctx, []string{eventID})
-	if err != nil {
-		return nil, err
-	}
-
-	if u.membership != membershipStateLeaveOrBan {
-		if err = u.d.statements.updateMembership(
-			u.ctx, u.txn, u.roomNID, u.targetUserNID, senderUserNID,
-			membershipStateLeaveOrBan, nIDs[eventID],
-		); err != nil {
-			return nil, err
-		}
-	}
-	return inviteEventIDs, nil
-}
-
-// GetMembership implements query.RoomserverQueryAPIDB
-func (d *Database) GetMembership(
-	ctx context.Context, roomNID types.RoomNID, requestSenderUserID string,
-) (membershipEventNID types.EventNID, stillInRoom bool, err error) {
-	requestSenderUserNID, err := d.assignStateKeyNID(ctx, nil, requestSenderUserID)
-	if err != nil {
-		return
-	}
-
-	senderMembershipEventNID, senderMembership, err :=
-		d.statements.selectMembershipFromRoomAndTarget(
-			ctx, roomNID, requestSenderUserNID,
-		)
-	if err == sql.ErrNoRows {
-		// The user has never been a member of that room
-		return 0, false, nil
-	} else if err != nil {
-		return
-	}
-
-	return senderMembershipEventNID, senderMembership == membershipStateJoin, nil
-}
-
-// GetMembershipEventNIDsForRoom implements query.RoomserverQueryAPIDB
-func (d *Database) GetMembershipEventNIDsForRoom(
-	ctx context.Context, roomNID types.RoomNID, joinOnly bool,
-) ([]types.EventNID, error) {
-	if joinOnly {
-		return d.statements.selectMembershipsFromRoomAndMembership(
-			ctx, roomNID, membershipStateJoin,
-		)
-	}
-
-	return d.statements.selectMembershipsFromRoom(ctx, roomNID)
-}
-
-// EventsFromIDs implements query.RoomserverQueryAPIEventDB
-func (d *Database) EventsFromIDs(ctx context.Context, eventIDs []string) ([]types.Event, error) {
-	nidMap, err := d.EventNIDs(ctx, eventIDs)
-	if err != nil {
-		return nil, err
-	}
-
-	var nids []types.EventNID
-	for _, nid := range nidMap {
-		nids = append(nids, nid)
-	}
-
-	return d.Events(ctx, nids)
-}
-
-type transaction struct {
-	ctx context.Context
-	txn *sql.Tx
-}
-
-// Commit implements types.Transaction
-func (t *transaction) Commit() error {
-	return t.txn.Commit()
-}
-
-// Rollback implements types.Transaction
-func (t *transaction) Rollback() error {
-	return t.txn.Rollback()
 }
diff --git a/syncapi/consumers/clientapi.go b/syncapi/consumers/clientapi.go
index f0db5642..ed39cd2d 100644
--- a/syncapi/consumers/clientapi.go
+++ b/syncapi/consumers/clientapi.go
@@ -30,7 +30,7 @@ import (
 // OutputClientDataConsumer consumes events that originated in the client API server.
 type OutputClientDataConsumer struct {
 	clientAPIConsumer *common.ContinualConsumer
-	db                *storage.SyncServerDatasource
+	db                storage.Database
 	notifier          *sync.Notifier
 }
 
@@ -39,7 +39,7 @@ func NewOutputClientDataConsumer(
 	cfg *config.Dendrite,
 	kafkaConsumer sarama.Consumer,
 	n *sync.Notifier,
-	store *storage.SyncServerDatasource,
+	store storage.Database,
 ) *OutputClientDataConsumer {
 
 	consumer := common.ContinualConsumer{
diff --git a/syncapi/consumers/roomserver.go b/syncapi/consumers/roomserver.go
index e4f1ab46..cde2f508 100644
--- a/syncapi/consumers/roomserver.go
+++ b/syncapi/consumers/roomserver.go
@@ -33,7 +33,7 @@ import (
 // OutputRoomEventConsumer consumes events that originated in the room server.
 type OutputRoomEventConsumer struct {
 	roomServerConsumer *common.ContinualConsumer
-	db                 *storage.SyncServerDatasource
+	db                 storage.Database
 	notifier           *sync.Notifier
 	query              api.RoomserverQueryAPI
 }
@@ -43,7 +43,7 @@ func NewOutputRoomEventConsumer(
 	cfg *config.Dendrite,
 	kafkaConsumer sarama.Consumer,
 	n *sync.Notifier,
-	store *storage.SyncServerDatasource,
+	store storage.Database,
 	queryAPI api.RoomserverQueryAPI,
 ) *OutputRoomEventConsumer {
 
diff --git a/syncapi/consumers/typingserver.go b/syncapi/consumers/typingserver.go
index 5d998a18..392f7987 100644
--- a/syncapi/consumers/typingserver.go
+++ b/syncapi/consumers/typingserver.go
@@ -30,7 +30,7 @@ import (
 // OutputTypingEventConsumer consumes events that originated in the typing server.
 type OutputTypingEventConsumer struct {
 	typingConsumer *common.ContinualConsumer
-	db             *storage.SyncServerDatasource
+	db             storage.Database
 	notifier       *sync.Notifier
 }
 
@@ -40,7 +40,7 @@ func NewOutputTypingEventConsumer(
 	cfg *config.Dendrite,
 	kafkaConsumer sarama.Consumer,
 	n *sync.Notifier,
-	store *storage.SyncServerDatasource,
+	store storage.Database,
 ) *OutputTypingEventConsumer {
 
 	consumer := common.ContinualConsumer{
diff --git a/syncapi/routing/routing.go b/syncapi/routing/routing.go
index 0f5019fc..bd9389bd 100644
--- a/syncapi/routing/routing.go
+++ b/syncapi/routing/routing.go
@@ -34,7 +34,7 @@ const pathPrefixR0 = "/_matrix/client/r0"
 // Due to Setup being used to call many other functions, a gocyclo nolint is
 // applied:
 // nolint: gocyclo
-func Setup(apiMux *mux.Router, srp *sync.RequestPool, syncDB *storage.SyncServerDatasource, deviceDB *devices.Database) {
+func Setup(apiMux *mux.Router, srp *sync.RequestPool, syncDB storage.Database, deviceDB *devices.Database) {
 	r0mux := apiMux.PathPrefix(pathPrefixR0).Subrouter()
 
 	authData := auth.Data{
diff --git a/syncapi/routing/state.go b/syncapi/routing/state.go
index 87a93d19..61eaf218 100644
--- a/syncapi/routing/state.go
+++ b/syncapi/routing/state.go
@@ -40,7 +40,7 @@ type stateEventInStateResp struct {
 // TODO: Check if the user is in the room. If not, check if the room's history
 // is publicly visible. Current behaviour is returning an empty array if the
 // user cannot see the room's history.
-func OnIncomingStateRequest(req *http.Request, db *storage.SyncServerDatasource, roomID string) util.JSONResponse {
+func OnIncomingStateRequest(req *http.Request, db storage.Database, roomID string) util.JSONResponse {
 	// TODO(#287): Auth request and handle the case where the user has left (where
 	// we should return the state at the poin they left)
 
@@ -87,7 +87,7 @@ func OnIncomingStateRequest(req *http.Request, db *storage.SyncServerDatasource,
 // /rooms/{roomID}/state/{type}/{statekey} request. It will look in current
 // state to see if there is an event with that type and state key, if there
 // is then (by default) we return the content, otherwise a 404.
-func OnIncomingStateTypeRequest(req *http.Request, db *storage.SyncServerDatasource, roomID string, evType, stateKey string) util.JSONResponse {
+func OnIncomingStateTypeRequest(req *http.Request, db storage.Database, roomID string, evType, stateKey string) util.JSONResponse {
 	// TODO(#287): Auth request and handle the case where the user has left (where
 	// we should return the state at the poin they left)
 
diff --git a/syncapi/storage/account_data_table.go b/syncapi/storage/postgres/account_data_table.go
index 7b4803e3..33cfffad 100644
--- a/syncapi/storage/account_data_table.go
+++ b/syncapi/storage/postgres/account_data_table.go
@@ -1,4 +1,5 @@
-// Copyright 2017 Vector Creations Ltd
+// 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.
@@ -12,7 +13,7 @@
 // See the License for the specific language governing permissions and
 // limitations under the License.
 
-package storage
+package postgres
 
 import (
 	"context"
diff --git a/syncapi/storage/current_room_state_table.go b/syncapi/storage/postgres/current_room_state_table.go
index 1ab70879..dbfa111b 100644
--- a/syncapi/storage/current_room_state_table.go
+++ b/syncapi/storage/postgres/current_room_state_table.go
@@ -1,4 +1,5 @@
-// Copyright 2017 Vector Creations Ltd
+// 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.
@@ -12,7 +13,7 @@
 // See the License for the specific language governing permissions and
 // limitations under the License.
 
-package storage
+package postgres
 
 import (
 	"context"
diff --git a/syncapi/storage/filtering.go b/syncapi/storage/postgres/filtering.go
index 27b0b888..dcc42136 100644
--- a/syncapi/storage/filtering.go
+++ b/syncapi/storage/postgres/filtering.go
@@ -12,7 +12,7 @@
 // See the License for the specific language governing permissions and
 // limitations under the License.
 
-package storage
+package postgres
 
 import (
 	"strings"
diff --git a/syncapi/storage/invites_table.go b/syncapi/storage/postgres/invites_table.go
index 9f52087f..ced4bfc4 100644
--- a/syncapi/storage/invites_table.go
+++ b/syncapi/storage/postgres/invites_table.go
@@ -1,4 +1,19 @@
-package storage
+// 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"
diff --git a/syncapi/storage/output_room_events_table.go b/syncapi/storage/postgres/output_room_events_table.go
index e1803a17..3927f0c3 100644
--- a/syncapi/storage/output_room_events_table.go
+++ b/syncapi/storage/postgres/output_room_events_table.go
@@ -1,4 +1,5 @@
-// Copyright 2017 Vector Creations Ltd
+// 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.
@@ -12,7 +13,7 @@
 // See the License for the specific language governing permissions and
 // limitations under the License.
 
-package storage
+package postgres
 
 import (
 	"context"
diff --git a/syncapi/storage/syncserver.go b/syncapi/storage/postgres/syncserver.go
index cda44d2e..fc7b4e40 100644
--- a/syncapi/storage/syncserver.go
+++ b/syncapi/storage/postgres/syncserver.go
@@ -1,4 +1,5 @@
-// Copyright 2017 Vector Creations Ltd
+// 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.
@@ -12,7 +13,7 @@
 // See the License for the specific language governing permissions and
 // limitations under the License.
 
-package storage
+package postgres
 
 import (
 	"context"
diff --git a/syncapi/storage/storage.go b/syncapi/storage/storage.go
new file mode 100644
index 00000000..eedb42f0
--- /dev/null
+++ b/syncapi/storage/storage.go
@@ -0,0 +1,63 @@
+// Copyright 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 storage
+
+import (
+	"context"
+	"errors"
+	"net/url"
+	"time"
+
+	"github.com/matrix-org/dendrite/clientapi/auth/authtypes"
+	"github.com/matrix-org/dendrite/common"
+	"github.com/matrix-org/dendrite/roomserver/api"
+	"github.com/matrix-org/dendrite/syncapi/storage/postgres"
+	"github.com/matrix-org/dendrite/syncapi/types"
+	"github.com/matrix-org/dendrite/typingserver/cache"
+	"github.com/matrix-org/gomatrixserverlib"
+)
+
+type Database interface {
+	common.PartitionStorer
+	AllJoinedUsersInRooms(ctx context.Context) (map[string][]string, error)
+	Events(ctx context.Context, eventIDs []string) ([]gomatrixserverlib.Event, error)
+	WriteEvent(ctx context.Context, ev *gomatrixserverlib.Event, addStateEvents []gomatrixserverlib.Event, addStateEventIDs, removeStateEventIDs []string, transactionID *api.TransactionID) (pduPosition int64, returnErr error)
+	GetStateEvent(ctx context.Context, roomID, evType, stateKey string) (*gomatrixserverlib.Event, error)
+	GetStateEventsForRoom(ctx context.Context, roomID string, stateFilterPart *gomatrixserverlib.FilterPart) (stateEvents []gomatrixserverlib.Event, err error)
+	SyncPosition(ctx context.Context) (types.SyncPosition, error)
+	IncrementalSync(ctx context.Context, device authtypes.Device, fromPos, toPos types.SyncPosition, numRecentEventsPerRoom int, wantFullState bool) (*types.Response, error)
+	CompleteSync(ctx context.Context, userID string, numRecentEventsPerRoom int) (*types.Response, error)
+	GetAccountDataInRange(ctx context.Context, userID string, oldPos, newPos int64, accountDataFilterPart *gomatrixserverlib.FilterPart) (map[string][]string, error)
+	UpsertAccountData(ctx context.Context, userID, roomID, dataType string) (int64, error)
+	AddInviteEvent(ctx context.Context, inviteEvent gomatrixserverlib.Event) (int64, error)
+	RetireInviteEvent(ctx context.Context, inviteEventID string) error
+	SetTypingTimeoutCallback(fn cache.TimeoutCallbackFn)
+	AddTypingUser(userID, roomID string, expireTime *time.Time) int64
+	RemoveTypingUser(userID, roomID string) int64
+}
+
+// NewPublicRoomsServerDatabase opens a database connection.
+func NewSyncServerDatasource(dataSourceName string) (Database, error) {
+	uri, err := url.Parse(dataSourceName)
+	if err != nil {
+		return nil, err
+	}
+	switch uri.Scheme {
+	case "postgres":
+		return postgres.NewSyncServerDatasource(dataSourceName)
+	default:
+		return nil, errors.New("unknown schema")
+	}
+}
diff --git a/syncapi/sync/notifier.go b/syncapi/sync/notifier.go
index 15d6b070..548a17ac 100644
--- a/syncapi/sync/notifier.go
+++ b/syncapi/sync/notifier.go
@@ -141,7 +141,7 @@ func (n *Notifier) GetListener(req syncRequest) UserStreamListener {
 }
 
 // Load the membership states required to notify users correctly.
-func (n *Notifier) Load(ctx context.Context, db *storage.SyncServerDatasource) error {
+func (n *Notifier) Load(ctx context.Context, db storage.Database) error {
 	roomToUsers, err := db.AllJoinedUsersInRooms(ctx)
 	if err != nil {
 		return err
diff --git a/syncapi/sync/requestpool.go b/syncapi/sync/requestpool.go
index 94a36900..82505e68 100644
--- a/syncapi/sync/requestpool.go
+++ b/syncapi/sync/requestpool.go
@@ -31,13 +31,13 @@ import (
 
 // RequestPool manages HTTP long-poll connections for /sync
 type RequestPool struct {
-	db        *storage.SyncServerDatasource
+	db        storage.Database
 	accountDB *accounts.Database
 	notifier  *Notifier
 }
 
 // NewRequestPool makes a new RequestPool
-func NewRequestPool(db *storage.SyncServerDatasource, n *Notifier, adb *accounts.Database) *RequestPool {
+func NewRequestPool(db storage.Database, n *Notifier, adb *accounts.Database) *RequestPool {
 	return &RequestPool{db, adb, n}
 }