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

syncapi/storage/postgres/invites_table.go

@@ -0,0 +1,148 @@
+// 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/gomatrixserverlib"
+)
+
+const inviteEventsSchema = `
+CREATE TABLE IF NOT EXISTS syncapi_invite_events (
+	id BIGINT PRIMARY KEY DEFAULT nextval('syncapi_stream_id'),
+	event_id TEXT NOT NULL,
+	room_id TEXT NOT NULL,
+	target_user_id TEXT NOT NULL,
+	event_json TEXT NOT NULL
+);
+
+-- For looking up the invites for a given user.
+CREATE INDEX IF NOT EXISTS syncapi_invites_target_user_id_idx
+	ON syncapi_invite_events (target_user_id, id);
+
+-- For deleting old invites
+CREATE INDEX IF NOT EXISTS syncapi_invites_event_id_idx
+	ON syncapi_invite_events (event_id);
+`
+
+const insertInviteEventSQL = "" +
+	"INSERT INTO syncapi_invite_events (" +
+	" room_id, event_id, target_user_id, event_json" +
+	") VALUES ($1, $2, $3, $4) RETURNING id"
+
+const deleteInviteEventSQL = "" +
+	"DELETE FROM syncapi_invite_events WHERE event_id = $1"
+
+const selectInviteEventsInRangeSQL = "" +
+	"SELECT room_id, event_json FROM syncapi_invite_events" +
+	" WHERE target_user_id = $1 AND id > $2 AND id <= $3" +
+	" ORDER BY id DESC"
+
+const selectMaxInviteIDSQL = "" +
+	"SELECT MAX(id) FROM syncapi_invite_events"
+
+type inviteEventsStatements struct {
+	insertInviteEventStmt         *sql.Stmt
+	selectInviteEventsInRangeStmt *sql.Stmt
+	deleteInviteEventStmt         *sql.Stmt
+	selectMaxInviteIDStmt         *sql.Stmt
+}
+
+func (s *inviteEventsStatements) prepare(db *sql.DB) (err error) {
+	_, err = db.Exec(inviteEventsSchema)
+	if err != nil {
+		return
+	}
+	if s.insertInviteEventStmt, err = db.Prepare(insertInviteEventSQL); err != nil {
+		return
+	}
+	if s.selectInviteEventsInRangeStmt, err = db.Prepare(selectInviteEventsInRangeSQL); err != nil {
+		return
+	}
+	if s.deleteInviteEventStmt, err = db.Prepare(deleteInviteEventSQL); err != nil {
+		return
+	}
+	if s.selectMaxInviteIDStmt, err = db.Prepare(selectMaxInviteIDSQL); err != nil {
+		return
+	}
+	return
+}
+
+func (s *inviteEventsStatements) insertInviteEvent(
+	ctx context.Context, inviteEvent gomatrixserverlib.Event,
+) (streamPos int64, err error) {
+	err = s.insertInviteEventStmt.QueryRowContext(
+		ctx,
+		inviteEvent.RoomID(),
+		inviteEvent.EventID(),
+		*inviteEvent.StateKey(),
+		inviteEvent.JSON(),
+	).Scan(&streamPos)
+	return
+}
+
+func (s *inviteEventsStatements) deleteInviteEvent(
+	ctx context.Context, inviteEventID string,
+) error {
+	_, err := s.deleteInviteEventStmt.ExecContext(ctx, inviteEventID)
+	return err
+}
+
+// selectInviteEventsInRange returns a map of room ID to invite event for the
+// active invites for the target user ID in the supplied range.
+func (s *inviteEventsStatements) selectInviteEventsInRange(
+	ctx context.Context, txn *sql.Tx, targetUserID string, startPos, endPos int64,
+) (map[string]gomatrixserverlib.Event, error) {
+	stmt := common.TxStmt(txn, s.selectInviteEventsInRangeStmt)
+	rows, err := stmt.QueryContext(ctx, targetUserID, startPos, endPos)
+	if err != nil {
+		return nil, err
+	}
+	defer rows.Close() // nolint: errcheck
+	result := map[string]gomatrixserverlib.Event{}
+	for rows.Next() {
+		var (
+			roomID    string
+			eventJSON []byte
+		)
+		if err = rows.Scan(&roomID, &eventJSON); err != nil {
+			return nil, err
+		}
+
+		event, err := gomatrixserverlib.NewEventFromTrustedJSON(eventJSON, false)
+		if err != nil {
+			return nil, err
+		}
+
+		result[roomID] = event
+	}
+	return result, nil
+}
+
+func (s *inviteEventsStatements) selectMaxInviteID(
+	ctx context.Context, txn *sql.Tx,
+) (id int64, err error) {
+	var nullableID sql.NullInt64
+	stmt := common.TxStmt(txn, s.selectMaxInviteIDStmt)
+	err = stmt.QueryRowContext(ctx).Scan(&nullableID)
+	if nullableID.Valid {
+		id = nullableID.Int64
+	}
+	return
+}