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

4 files changed, 144 insertions, 96 deletions

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)
 }