forked from pingcap/br
/
compress.go
131 lines (114 loc) · 3.28 KB
/
compress.go
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// Copyright 2020 PingCAP, Inc. Licensed under Apache-2.0.
package storage
import (
"bytes"
"context"
"io"
berrors "github.com/pingcap/br/pkg/errors"
"github.com/pingcap/errors"
)
type withCompression struct {
ExternalStorage
compressType CompressType
}
// WithCompression returns an ExternalStorage with compress option
func WithCompression(inner ExternalStorage, compressionType CompressType) ExternalStorage {
if compressionType == NoCompression {
return inner
}
return &withCompression{ExternalStorage: inner, compressType: compressionType}
}
func (w *withCompression) Create(ctx context.Context, name string) (ExternalFileWriter, error) {
var (
writer ExternalFileWriter
err error
)
if s3Storage, ok := w.ExternalStorage.(*S3Storage); ok {
writer, err = s3Storage.CreateUploader(ctx, name)
} else {
writer, err = w.ExternalStorage.Create(ctx, name)
}
if err != nil {
return nil, errors.Trace(err)
}
compressedWriter := newBufferedWriter(writer, hardcodedS3ChunkSize, w.compressType)
return compressedWriter, nil
}
func (w *withCompression) Open(ctx context.Context, path string) (ExternalFileReader, error) {
fileReader, err := w.ExternalStorage.Open(ctx, path)
if err != nil {
return nil, errors.Trace(err)
}
uncompressReader, err := newInterceptReader(fileReader, w.compressType)
if err != nil {
return nil, errors.Trace(err)
}
return uncompressReader, nil
}
func (w *withCompression) WriteFile(ctx context.Context, name string, data []byte) error {
bf := bytes.NewBuffer(make([]byte, 0, len(data)))
compressBf := newCompressWriter(w.compressType, bf)
_, err := compressBf.Write(data)
if err != nil {
return errors.Trace(err)
}
err = compressBf.Close()
if err != nil {
return errors.Trace(err)
}
return w.ExternalStorage.WriteFile(ctx, name, bf.Bytes())
}
func (w *withCompression) ReadFile(ctx context.Context, name string) ([]byte, error) {
data, err := w.ExternalStorage.ReadFile(ctx, name)
if err != nil {
return data, errors.Trace(err)
}
bf := bytes.NewBuffer(data)
compressBf, err := newCompressReader(w.compressType, bf)
if err != nil {
return nil, err
}
return io.ReadAll(compressBf)
}
type compressReader struct {
io.ReadCloser
}
// nolint:interfacer
func newInterceptReader(fileReader ExternalFileReader, compressType CompressType) (ExternalFileReader, error) {
if compressType == NoCompression {
return fileReader, nil
}
r, err := newCompressReader(compressType, fileReader)
if err != nil {
return nil, errors.Trace(err)
}
return &compressReader{
ReadCloser: r,
}, nil
}
func (r *compressReader) Seek(_ int64, _ int) (int64, error) {
return int64(0), errors.Annotatef(berrors.ErrStorageInvalidConfig, "compressReader doesn't support Seek now")
}
type flushStorageWriter struct {
writer io.Writer
flusher flusher
closer io.Closer
}
func (w *flushStorageWriter) Write(ctx context.Context, data []byte) (int, error) {
n, err := w.writer.Write(data)
return n, errors.Trace(err)
}
func (w *flushStorageWriter) Close(ctx context.Context) error {
err := w.flusher.Flush()
if err != nil {
return errors.Trace(err)
}
return w.closer.Close()
}
func newFlushStorageWriter(writer io.Writer, flusher2 flusher, closer io.Closer) *flushStorageWriter {
return &flushStorageWriter{
writer: writer,
flusher: flusher2,
closer: closer,
}
}