mirror of
https://github.com/hoernschen/dendrite.git
synced 2024-12-29 08:18:27 +00:00
d5dbe546e4
* Always defer *sql.Rows.Close and consult with Err database/sql.Rows.Next() makes sure to call Close only after exhausting result rows which would NOT happen when returning early from a bad Scan. Close being idempotent makes it a great candidate to get always deferred regardless of what happens later on the result set. This change also makes sure call Err() after exhausting Next() and propagate non-nil results from it as the documentation advises. Closes #764 Signed-off-by: Kiril Vladimiroff <kiril@vladimiroff.org> * Override named result parameters in last returns Signed-off-by: Kiril Vladimiroff <kiril@vladimiroff.org> * Do the same over new changes that got merged Signed-off-by: Kiril Vladimiroff <kiril@vladimiroff.org> Co-authored-by: Neil Alexander <neilalexander@users.noreply.github.com>
120 lines
3.4 KiB
Go
120 lines
3.4 KiB
Go
// 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 postgres
|
|
|
|
import (
|
|
"context"
|
|
"database/sql"
|
|
)
|
|
|
|
const backwardExtremitiesSchema = `
|
|
-- Stores output room events received from the roomserver.
|
|
CREATE TABLE IF NOT EXISTS syncapi_backward_extremities (
|
|
-- The 'room_id' key for the event.
|
|
room_id TEXT NOT NULL,
|
|
-- The event ID for the event.
|
|
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 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, roomID, eventID string,
|
|
) (err error) {
|
|
_, err = s.insertBackwardExtremityStmt.ExecContext(ctx, roomID, eventID)
|
|
return
|
|
}
|
|
|
|
func (s *backwardExtremitiesStatements) selectBackwardExtremitiesForRoom(
|
|
ctx context.Context, roomID string,
|
|
) (eventIDs []string, err error) {
|
|
eventIDs = make([]string, 0)
|
|
|
|
rows, err := s.selectBackwardExtremitiesForRoomStmt.QueryContext(ctx, roomID)
|
|
if err != nil {
|
|
return
|
|
}
|
|
defer rows.Close() // nolint: errcheck
|
|
|
|
for rows.Next() {
|
|
var eID string
|
|
if err = rows.Scan(&eID); err != nil {
|
|
return
|
|
}
|
|
|
|
eventIDs = append(eventIDs, eID)
|
|
}
|
|
|
|
return eventIDs, rows.Err()
|
|
}
|
|
|
|
func (s *backwardExtremitiesStatements) isBackwardExtremity(
|
|
ctx context.Context, roomID, eventID string,
|
|
) (isBE bool, err error) {
|
|
err = s.isBackwardExtremityStmt.QueryRowContext(ctx, roomID, eventID).Scan(&isBE)
|
|
return
|
|
}
|
|
|
|
func (s *backwardExtremitiesStatements) deleteBackwardExtremity(
|
|
ctx context.Context, roomID, eventID string,
|
|
) (err error) {
|
|
_, err = s.insertBackwardExtremityStmt.ExecContext(ctx, roomID, eventID)
|
|
return
|
|
}
|