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rows_unlocker.go
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/
rows_unlocker.go
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// Copyright 2023 The Cockroach Authors
//
// 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.
//
// SPDX-License-Identifier: Apache-2.0
package serial
import (
"runtime"
"github.com/jackc/pgx/v5"
"github.com/jackc/pgx/v5/pgconn"
)
// rowsUnlocker will call an Unlock method once the Rows has been
// closed, exhausted, or enters an error state.
type rowsUnlocker struct {
r pgx.Rows
u interface{ Unlock() }
}
var _ pgx.Rows = (*rowsUnlocker)(nil)
func (r *rowsUnlocker) Conn() *pgx.Conn {
return r.r.Conn()
}
func (r *rowsUnlocker) CommandTag() pgconn.CommandTag {
return r.r.CommandTag()
}
func (r *rowsUnlocker) Close() {
r.r.Close()
r.unlock()
}
func (r *rowsUnlocker) Err() error {
err := r.r.Err()
if err != nil {
r.unlock()
}
return err
}
func (r *rowsUnlocker) FieldDescriptions() []pgconn.FieldDescription {
return r.r.FieldDescriptions()
}
func (r *rowsUnlocker) Next() bool {
if r.r.Next() {
return true
}
r.unlock()
return false
}
func (r *rowsUnlocker) RawValues() [][]byte {
return r.r.RawValues()
}
func (r *rowsUnlocker) Scan(dest ...any) error {
err := r.r.Scan(dest...)
if err != nil {
r.unlock()
}
return err
}
func (r *rowsUnlocker) Values() ([]any, error) {
ret, err := r.r.Values()
if err != nil {
r.unlock()
}
return ret, err
}
// unlock only acts once.
func (r *rowsUnlocker) unlock() {
if u := r.u; u != nil {
runtime.SetFinalizer(r, nil)
u.Unlock()
r.u = nil
}
}