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// Copyright 2018 New Vector Ltd
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package sqlite3
import (
"context"
"database/sql"
"github.com/matrix-org/dendrite/common"
)
const backwardExtremitiesSchema = `
-- Stores output room events received from the roomserver.
CREATE TABLE IF NOT EXISTS syncapi_backward_extremities (
room_id TEXT NOT NULL,
event_id TEXT NOT NULL,
PRIMARY KEY(room_id, event_id)
);
`
const insertBackwardExtremitySQL = "" +
"INSERT INTO syncapi_backward_extremities (room_id, event_id)" +
" VALUES ($1, $2)" +
" ON CONFLICT (room_id, event_id) DO NOTHING"
const selectBackwardExtremitiesForRoomSQL = "" +
"SELECT event_id FROM syncapi_backward_extremities WHERE room_id = $1"
const isBackwardExtremitySQL = "" +
"SELECT EXISTS (" +
" SELECT TRUE FROM syncapi_backward_extremities" +
" WHERE room_id = $1 AND event_id = $2" +
")"
const deleteBackwardExtremitySQL = "" +
"DELETE FROM syncapi_backward_extremities" +
" WHERE room_id = $1 AND event_id = $2"
type backwardExtremitiesStatements struct {
insertBackwardExtremityStmt *sql.Stmt
selectBackwardExtremitiesForRoomStmt *sql.Stmt
isBackwardExtremityStmt *sql.Stmt
deleteBackwardExtremityStmt *sql.Stmt
}
func (s *backwardExtremitiesStatements) prepare(db *sql.DB) (err error) {
_, err = db.Exec(backwardExtremitiesSchema)
if err != nil {
return
}
if s.insertBackwardExtremityStmt, err = db.Prepare(insertBackwardExtremitySQL); err != nil {
return
}
if s.selectBackwardExtremitiesForRoomStmt, err = db.Prepare(selectBackwardExtremitiesForRoomSQL); err != nil {
return
}
if s.isBackwardExtremityStmt, err = db.Prepare(isBackwardExtremitySQL); err != nil {
return
}
if s.deleteBackwardExtremityStmt, err = db.Prepare(deleteBackwardExtremitySQL); err != nil {
return
}
return
}
func (s *backwardExtremitiesStatements) insertsBackwardExtremity(
ctx context.Context, txn *sql.Tx, roomID, eventID string,
) (err error) {
stmt := common.TxStmt(txn, s.insertBackwardExtremityStmt)
_, err = stmt.ExecContext(ctx, roomID, eventID)
return
}
func (s *backwardExtremitiesStatements) selectBackwardExtremitiesForRoom(
ctx context.Context, txn *sql.Tx, roomID string,
) (eventIDs []string, err error) {
eventIDs = make([]string, 0)
stmt := common.TxStmt(txn, s.selectBackwardExtremitiesForRoomStmt)
rows, err := stmt.QueryContext(ctx, roomID)
if err != nil {
return
}
for rows.Next() {
var eID string
if err = rows.Scan(&eID); err != nil {
return
}
eventIDs = append(eventIDs, eID)
}
return
}
func (s *backwardExtremitiesStatements) isBackwardExtremity(
ctx context.Context, txn *sql.Tx, roomID, eventID string,
) (isBE bool, err error) {
stmt := common.TxStmt(txn, s.isBackwardExtremityStmt)
err = stmt.QueryRowContext(ctx, roomID, eventID).Scan(&isBE)
return
}
func (s *backwardExtremitiesStatements) deleteBackwardExtremity(
ctx context.Context, txn *sql.Tx, roomID, eventID string,
) (err error) {
stmt := common.TxStmt(txn, s.deleteBackwardExtremityStmt)
_, err = stmt.ExecContext(ctx, roomID, eventID)
return
}
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