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wait_pipe.go
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wait_pipe.go
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// Copyright (c) 2015-2021 MinIO, Inc.
//
// This file is part of MinIO Object Storage stack
//
// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU Affero General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// This program is distributed in the hope that it will be useful
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU Affero General Public License for more details.
//
// You should have received a copy of the GNU Affero General Public License
// along with this program. If not, see <http://www.gnu.org/licenses/>.
package ioutil
import (
"io"
"sync"
)
// PipeWriter is similar to io.PipeWriter with wait group
type PipeWriter struct {
*io.PipeWriter
done func()
}
// CloseWithError close with supplied error the writer end.
func (w *PipeWriter) CloseWithError(err error) error {
err = w.PipeWriter.CloseWithError(err)
w.done()
return err
}
// PipeReader is similar to io.PipeReader with wait group
type PipeReader struct {
*io.PipeReader
wait func()
}
// CloseWithError close with supplied error the reader end
func (r *PipeReader) CloseWithError(err error) error {
err = r.PipeReader.CloseWithError(err)
r.wait()
return err
}
// WaitPipe implements wait-group backend io.Pipe to provide
// synchronization between read() end with write() end.
func WaitPipe() (*PipeReader, *PipeWriter) {
r, w := io.Pipe()
var wg sync.WaitGroup
wg.Add(1)
return &PipeReader{
PipeReader: r,
wait: wg.Wait,
}, &PipeWriter{
PipeWriter: w,
done: wg.Done,
}
}