58 lines
1.4 KiB
Go
58 lines
1.4 KiB
Go
/*
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Copyright The containerd 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 "io"
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// writeCloseInformer wraps a reader with a close function.
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type wrapReadCloser struct {
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reader *io.PipeReader
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writer *io.PipeWriter
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}
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// NewWrapReadCloser creates a wrapReadCloser from a reader.
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// NOTE(random-liu): To avoid goroutine leakage, the reader passed in
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// must be eventually closed by the caller.
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func NewWrapReadCloser(r io.Reader) io.ReadCloser {
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pr, pw := io.Pipe()
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go func() {
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_, _ = io.Copy(pw, r)
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pr.Close()
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pw.Close()
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}()
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return &wrapReadCloser{
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reader: pr,
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writer: pw,
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}
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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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n, err := w.reader.Read(p)
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if err == io.ErrClosedPipe {
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return n, io.EOF
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}
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return n, err
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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.reader.Close()
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w.writer.Close()
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return nil
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}
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