/
reader.go
49 lines (43 loc) · 1.24 KB
/
reader.go
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// Copyright 2019 Huawei Technologies Co.,Ltd.
// 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 assist
import (
"io"
)
type MultiWritersReader struct {
reader io.Reader
writers []io.Writer
}
func (mwr *MultiWritersReader) Read(p []byte) (n int, err error) {
n, err = mwr.reader.Read(p)
if mwr.writers != nil {
if n > 0 {
for _, writer := range mwr.writers {
if writer != nil {
writer.Write(p[:n])
}
}
}
}
return
}
func Wrap(reader io.Reader, writers ...io.Writer) io.Reader {
length := len(writers)
if length == 0 {
return reader
}
_writers := make([]io.Writer, 0, length)
for _, writer := range writers {
_writers = append(_writers, writer)
}
return &MultiWritersReader{reader: reader, writers: _writers}
}