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gzip.go
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gzip.go
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// Licensed to the Apache Software Foundation (ASF) under one or more
// contributor license agreements. See the NOTICE file distributed with
// this work for additional information regarding copyright ownership.
// The ASF licenses this file to You 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 fileio
import (
"compress/gzip"
"context"
"io"
"github.com/apache/beam/sdks/v2/go/pkg/beam/log"
)
// gzipReader is a wrapper around a gzip.Reader that also closes the underlying io.ReadCloser.
type gzipReader struct {
rc io.ReadCloser
zr *gzip.Reader
}
// newGzipReader creates a new gzipReader from an io.ReadCloser.
func newGzipReader(rc io.ReadCloser) (*gzipReader, error) {
zr, err := gzip.NewReader(rc)
if err != nil {
return nil, err
}
return &gzipReader{rc: rc, zr: zr}, nil
}
// Read reads from the gzip reader.
func (r *gzipReader) Read(p []byte) (int, error) {
return r.zr.Read(p)
}
// Close closes the gzip reader and the underlying io.ReadCloser.
func (r *gzipReader) Close() (err error) {
defer func() {
rcErr := r.rc.Close()
if err != nil {
if rcErr != nil {
log.Errorf(context.Background(), "error closing reader: %v", rcErr)
}
return
}
err = rcErr
}()
return r.zr.Close()
}