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multi_readcloser.go
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multi_readcloser.go
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/*
* Copyright 2022 The Dragonfly 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 io
import (
"io"
"github.com/hashicorp/go-multierror"
)
// multiReadCloser is MultiReadCloser instance.
type multiReadCloser struct {
reader io.Reader
closers []io.Closer
}
// MultiReadCloser returns a ReadCloser that's the logical concatenation of
// the provided input readClosers.
func MultiReadCloser(readClosers ...io.ReadCloser) io.ReadCloser {
readers := make([]io.Reader, len(readClosers))
closers := make([]io.Closer, len(readClosers))
for readCloser := range readClosers {
closers[readCloser] = readClosers[readCloser]
readers[readCloser] = readClosers[readCloser]
}
return &multiReadCloser{
reader: io.MultiReader(readers...),
closers: closers,
}
}
// Reader is the interface that wraps the basic Read method for multiReadCloser.
func (m *multiReadCloser) Read(p []byte) (int, error) {
return m.reader.Read(p)
}
// Closer is the interface that wraps the basic Close method for multiReadCloser.
func (m *multiReadCloser) Close() error {
var merr error
for i := range m.closers {
if err := m.closers[i].Close(); err != nil {
merr = multierror.Append(merr, err)
}
}
return merr
}