100 lines
3 KiB
Go
100 lines
3 KiB
Go
// Copyright 2017 Vector Creations Ltd
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package storage
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import (
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"context"
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"database/sql"
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"github.com/matrix-org/dendrite/common"
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)
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const roomSchema = `
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CREATE TABLE IF NOT EXISTS federationsender_rooms (
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-- The string ID of the room
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room_id TEXT PRIMARY KEY,
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-- The most recent event state by the room server.
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-- We can use this to tell if our view of the room state has become
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-- desynchronised.
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last_event_id TEXT NOT NULL
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);`
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const insertRoomSQL = "" +
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"INSERT INTO federationsender_rooms (room_id, last_event_id) VALUES ($1, '')" +
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" ON CONFLICT DO NOTHING"
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const selectRoomForUpdateSQL = "" +
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"SELECT last_event_id FROM federationsender_rooms WHERE room_id = $1 FOR UPDATE"
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const updateRoomSQL = "" +
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"UPDATE federationsender_rooms SET last_event_id = $2 WHERE room_id = $1"
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type roomStatements struct {
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insertRoomStmt *sql.Stmt
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selectRoomForUpdateStmt *sql.Stmt
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updateRoomStmt *sql.Stmt
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}
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func (s *roomStatements) prepare(db *sql.DB) (err error) {
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_, err = db.Exec(roomSchema)
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if err != nil {
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return
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}
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if s.insertRoomStmt, err = db.Prepare(insertRoomSQL); err != nil {
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return
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}
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if s.selectRoomForUpdateStmt, err = db.Prepare(selectRoomForUpdateSQL); err != nil {
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return
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}
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if s.updateRoomStmt, err = db.Prepare(updateRoomSQL); err != nil {
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return
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}
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return
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}
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// insertRoom inserts the room if it didn't already exist.
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// If the room didn't exist then last_event_id is set to the empty string.
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func (s *roomStatements) insertRoom(
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ctx context.Context, txn *sql.Tx, roomID string,
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) error {
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_, err := common.TxStmt(txn, s.insertRoomStmt).ExecContext(ctx, roomID)
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return err
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}
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// selectRoomForUpdate locks the row for the room and returns the last_event_id.
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// The row must already exist in the table. Callers can ensure that the row
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// exists by calling insertRoom first.
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func (s *roomStatements) selectRoomForUpdate(
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ctx context.Context, txn *sql.Tx, roomID string,
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) (string, error) {
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var lastEventID string
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stmt := common.TxStmt(txn, s.selectRoomForUpdateStmt)
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err := stmt.QueryRowContext(ctx, roomID).Scan(&lastEventID)
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if err != nil {
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return "", err
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}
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return lastEventID, nil
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}
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// updateRoom updates the last_event_id for the room. selectRoomForUpdate should
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// have already been called earlier within the transaction.
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func (s *roomStatements) updateRoom(
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ctx context.Context, txn *sql.Tx, roomID, lastEventID string,
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) error {
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stmt := common.TxStmt(txn, s.updateRoomStmt)
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_, err := stmt.ExecContext(ctx, roomID, lastEventID)
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return err
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}
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