/*
 * Copyright 2020 The Knative 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.
 */

package upgrade_test

import (
	"bytes"
	"sync"

	"go.uber.org/zap/zaptest"
)

// To avoid race condition on zaptest.Buffer, see: https://stackoverflow.com/a/36226525/844449
type buffer struct {
	bytes.Buffer
	sync.Mutex
	zaptest.Syncer
}

func (b *buffer) Read(p []byte) (n int, err error) {
	b.Mutex.Lock()
	defer b.Mutex.Unlock()
	return b.Buffer.Read(p)
}

func (b *buffer) Write(p []byte) (n int, err error) {
	b.Mutex.Lock()
	defer b.Mutex.Unlock()
	return b.Buffer.Write(p)
}

func (b *buffer) String() string {
	b.Mutex.Lock()
	defer b.Mutex.Unlock()
	return b.Buffer.String()
}
