55 lines
1.3 KiB
Go
55 lines
1.3 KiB
Go
/*
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Copyright 2017 The Kubernetes Authors.
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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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http://www.apache.org/licenses/LICENSE-2.0
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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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*/
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package ioutil
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import (
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"io"
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"sync"
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)
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// writeCloseInformer wraps a reader with a close function.
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type wrapReadCloser struct {
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// TODO(random-liu): Evaluate whether the lock introduces
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// performance regression.
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sync.RWMutex
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r io.Reader
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closed bool
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}
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// NewWrapReadCloser creates a wrapReadCloser from a reader.
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func NewWrapReadCloser(r io.Reader) io.ReadCloser {
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return &wrapReadCloser{r: r}
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}
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// Read reads up to len(p) bytes into p.
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func (w *wrapReadCloser) Read(p []byte) (int, error) {
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w.RLock()
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defer w.RUnlock()
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if w.closed {
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return 0, io.EOF
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}
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return w.r.Read(p)
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}
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// Close closes read closer.
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func (w *wrapReadCloser) Close() error {
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w.Lock()
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defer w.Unlock()
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w.closed = true
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return nil
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}
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