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128 lines
2.9 KiB
Go
128 lines
2.9 KiB
Go
/*
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* MinIO Cloud Storage, (C) 2019 MinIO, Inc.
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*
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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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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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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 s3select
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import (
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"compress/bzip2"
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"errors"
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"fmt"
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"io"
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"sync"
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"sync/atomic"
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gzip "github.com/klauspost/pgzip"
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)
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type countUpReader struct {
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reader io.Reader
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bytesRead int64
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}
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func (r *countUpReader) Read(p []byte) (n int, err error) {
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n, err = r.reader.Read(p)
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atomic.AddInt64(&r.bytesRead, int64(n))
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return n, err
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}
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func (r *countUpReader) BytesRead() int64 {
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if r == nil {
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return 0
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}
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return atomic.LoadInt64(&r.bytesRead)
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}
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func newCountUpReader(reader io.Reader) *countUpReader {
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return &countUpReader{
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reader: reader,
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}
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}
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type progressReader struct {
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rc io.ReadCloser
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scannedReader *countUpReader
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processedReader *countUpReader
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closedMu sync.Mutex
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gzr *gzip.Reader
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closed bool
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}
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func (pr *progressReader) Read(p []byte) (n int, err error) {
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// This ensures that Close will block until Read has completed.
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// This allows another goroutine to close the reader.
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pr.closedMu.Lock()
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defer pr.closedMu.Unlock()
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if pr.closed {
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return 0, errors.New("progressReader: read after Close")
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}
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return pr.processedReader.Read(p)
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}
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func (pr *progressReader) Close() error {
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pr.closedMu.Lock()
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defer pr.closedMu.Unlock()
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if pr.closed {
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return nil
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}
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pr.closed = true
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if pr.gzr != nil {
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pr.gzr.Close()
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}
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return pr.rc.Close()
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}
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func (pr *progressReader) Stats() (bytesScanned, bytesProcessed int64) {
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if pr == nil {
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return 0, 0
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}
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return pr.scannedReader.BytesRead(), pr.processedReader.BytesRead()
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}
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func newProgressReader(rc io.ReadCloser, compType CompressionType) (*progressReader, error) {
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if rc == nil {
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return nil, errors.New("newProgressReader: nil reader provided")
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}
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scannedReader := newCountUpReader(rc)
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pr := progressReader{
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rc: rc,
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scannedReader: scannedReader,
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}
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var err error
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var r io.Reader
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switch compType {
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case noneType:
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r = scannedReader
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case gzipType:
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pr.gzr, err = gzip.NewReader(scannedReader)
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if err != nil {
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if errors.Is(err, gzip.ErrHeader) || errors.Is(err, gzip.ErrChecksum) {
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return nil, errInvalidGZIPCompressionFormat(err)
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}
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return nil, errTruncatedInput(err)
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}
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r = pr.gzr
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case bzip2Type:
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r = bzip2.NewReader(scannedReader)
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default:
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return nil, errInvalidCompressionFormat(fmt.Errorf("unknown compression type '%v'", compType))
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}
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pr.processedReader = newCountUpReader(r)
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return &pr, nil
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}
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