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>
127 lines
3.7 KiB
Go
127 lines
3.7 KiB
Go
// Copyright 2017-2018 New Vector Ltd
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// Copyright 2019-2020 The Matrix.org Foundation C.I.C.
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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 postgres
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import (
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"context"
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"database/sql"
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)
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const roomAliasesSchema = `
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-- Stores room aliases and room IDs they refer to
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CREATE TABLE IF NOT EXISTS roomserver_room_aliases (
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-- Alias of the room
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alias TEXT NOT NULL PRIMARY KEY,
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-- Room ID the alias refers to
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room_id TEXT NOT NULL,
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-- User ID of the creator of this alias
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creator_id TEXT NOT NULL
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);
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CREATE INDEX IF NOT EXISTS roomserver_room_id_idx ON roomserver_room_aliases(room_id);
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`
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const insertRoomAliasSQL = "" +
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"INSERT INTO roomserver_room_aliases (alias, room_id, creator_id) VALUES ($1, $2, $3)"
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const selectRoomIDFromAliasSQL = "" +
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"SELECT room_id FROM roomserver_room_aliases WHERE alias = $1"
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const selectAliasesFromRoomIDSQL = "" +
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"SELECT alias FROM roomserver_room_aliases WHERE room_id = $1"
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const selectCreatorIDFromAliasSQL = "" +
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"SELECT creator_id FROM roomserver_room_aliases WHERE alias = $1"
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const deleteRoomAliasSQL = "" +
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"DELETE FROM roomserver_room_aliases WHERE alias = $1"
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type roomAliasesStatements struct {
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insertRoomAliasStmt *sql.Stmt
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selectRoomIDFromAliasStmt *sql.Stmt
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selectAliasesFromRoomIDStmt *sql.Stmt
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selectCreatorIDFromAliasStmt *sql.Stmt
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deleteRoomAliasStmt *sql.Stmt
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}
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func (s *roomAliasesStatements) prepare(db *sql.DB) (err error) {
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_, err = db.Exec(roomAliasesSchema)
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if err != nil {
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return
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}
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return statementList{
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{&s.insertRoomAliasStmt, insertRoomAliasSQL},
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{&s.selectRoomIDFromAliasStmt, selectRoomIDFromAliasSQL},
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{&s.selectAliasesFromRoomIDStmt, selectAliasesFromRoomIDSQL},
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{&s.selectCreatorIDFromAliasStmt, selectCreatorIDFromAliasSQL},
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{&s.deleteRoomAliasStmt, deleteRoomAliasSQL},
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}.prepare(db)
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}
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func (s *roomAliasesStatements) insertRoomAlias(
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ctx context.Context, alias string, roomID string, creatorUserID string,
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) (err error) {
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_, err = s.insertRoomAliasStmt.ExecContext(ctx, alias, roomID, creatorUserID)
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return
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}
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func (s *roomAliasesStatements) selectRoomIDFromAlias(
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ctx context.Context, alias string,
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) (roomID string, err error) {
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err = s.selectRoomIDFromAliasStmt.QueryRowContext(ctx, alias).Scan(&roomID)
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if err == sql.ErrNoRows {
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return "", nil
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}
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return
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}
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func (s *roomAliasesStatements) selectAliasesFromRoomID(
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ctx context.Context, roomID string,
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) ([]string, error) {
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rows, err := s.selectAliasesFromRoomIDStmt.QueryContext(ctx, roomID)
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if err != nil {
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return nil, err
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}
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defer rows.Close() // nolint: errcheck
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var aliases []string
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for rows.Next() {
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var alias string
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if err = rows.Scan(&alias); err != nil {
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return nil, err
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}
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aliases = append(aliases, alias)
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}
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return aliases, rows.Err()
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}
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func (s *roomAliasesStatements) selectCreatorIDFromAlias(
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ctx context.Context, alias string,
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) (creatorID string, err error) {
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err = s.selectCreatorIDFromAliasStmt.QueryRowContext(ctx, alias).Scan(&creatorID)
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if err == sql.ErrNoRows {
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return "", nil
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}
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return
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}
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func (s *roomAliasesStatements) deleteRoomAlias(
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ctx context.Context, alias string,
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) (err error) {
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_, err = s.deleteRoomAliasStmt.ExecContext(ctx, alias)
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return
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}
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