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Copy pathprogress.go
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171 lines (152 loc) · 4.25 KB
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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 s3select
import (
"context"
"errors"
"fmt"
"io"
"runtime"
"sync"
"sync/atomic"
"github.com/cosnicolaou/pbzip2"
"github.com/klauspost/compress/s2"
"github.com/klauspost/compress/zstd"
gzip "github.com/klauspost/pgzip"
"github.com/pierrec/lz4"
)
type countUpReader struct {
reader io.Reader
bytesRead int64
}
// Max bzip2 concurrency across calls. 50% of GOMAXPROCS.
var bz2Limiter = pbzip2.CreateConcurrencyPool((runtime.GOMAXPROCS(0) + 1) / 2)
func (r *countUpReader) Read(p []byte) (n int, err error) {
n, err = r.reader.Read(p)
atomic.AddInt64(&r.bytesRead, int64(n))
return n, err
}
func (r *countUpReader) BytesRead() int64 {
if r == nil {
return 0
}
return atomic.LoadInt64(&r.bytesRead)
}
func newCountUpReader(reader io.Reader) *countUpReader {
return &countUpReader{
reader: reader,
}
}
type progressReader struct {
rc io.ReadCloser
scannedReader *countUpReader
processedReader *countUpReader
closedMu sync.Mutex
closer io.ReadCloser
closed bool
}
func (pr *progressReader) Read(p []byte) (n int, err error) {
// This ensures that Close will block until Read has completed.
// This allows another goroutine to close the reader.
pr.closedMu.Lock()
defer pr.closedMu.Unlock()
if pr.closed {
return 0, errors.New("progressReader: read after Close")
}
return pr.processedReader.Read(p)
}
func (pr *progressReader) Close() error {
pr.closedMu.Lock()
defer pr.closedMu.Unlock()
if pr.closed {
return nil
}
pr.closed = true
if pr.closer != nil {
pr.closer.Close()
}
return pr.rc.Close()
}
func (pr *progressReader) Stats() (bytesScanned, bytesProcessed int64) {
if pr == nil {
return 0, 0
}
return pr.scannedReader.BytesRead(), pr.processedReader.BytesRead()
}
func newProgressReader(rc io.ReadCloser, compType CompressionType) (*progressReader, error) {
if rc == nil {
return nil, errors.New("newProgressReader: nil reader provided")
}
scannedReader := newCountUpReader(rc)
pr := progressReader{
rc: rc,
scannedReader: scannedReader,
}
var r io.Reader
switch compType {
case noneType:
r = scannedReader
case gzipType:
gzr, err := gzip.NewReader(scannedReader)
if err != nil {
if errors.Is(err, gzip.ErrHeader) || errors.Is(err, gzip.ErrChecksum) {
return nil, errInvalidCompression(err, compType)
}
return nil, errTruncatedInput(err)
}
r = gzr
pr.closer = gzr
case bzip2Type:
ctx, cancel := context.WithCancel(context.Background())
r = pbzip2.NewReader(ctx, scannedReader, pbzip2.DecompressionOptions(
pbzip2.BZConcurrency((runtime.GOMAXPROCS(0)+1)/2),
pbzip2.BZConcurrencyPool(bz2Limiter),
))
pr.closer = &nopReadCloser{fn: cancel}
case zstdType:
// Set a max window of 64MB. More than reasonable.
zr, err := zstd.NewReader(scannedReader, zstd.WithDecoderConcurrency(2), zstd.WithDecoderMaxWindow(64<<20))
if err != nil {
return nil, errInvalidCompression(err, compType)
}
r = zr
pr.closer = zr.IOReadCloser()
case lz4Type:
r = lz4.NewReader(scannedReader)
case s2Type:
r = s2.NewReader(scannedReader)
case snappyType:
r = s2.NewReader(scannedReader, s2.ReaderMaxBlockSize(64<<10))
default:
return nil, errInvalidCompressionFormat(fmt.Errorf("unknown compression type '%v'", compType))
}
pr.processedReader = newCountUpReader(r)
return &pr, nil
}
type nopReadCloser struct {
fn func()
}
func (n2 *nopReadCloser) Read(p []byte) (n int, err error) {
panic("should not be called")
}
func (n2 *nopReadCloser) Close() error {
if n2.fn != nil {
n2.fn()
}
n2.fn = nil
return nil
}