156 lines
3.8 KiB
Go
156 lines
3.8 KiB
Go
// Copyright 2026 PingCAP, 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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package objectio
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import (
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"bytes"
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"context"
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"io"
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"github.com/pingcap/errors"
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"github.com/pingcap/tidb/pkg/objstore/compressedio"
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"github.com/pingcap/tidb/pkg/objstore/recording"
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)
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// EmptyFlusher empty Flusher.
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type EmptyFlusher struct{}
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// Flush do flush.
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func (*EmptyFlusher) Flush() error {
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return nil
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}
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type interceptBuffer interface {
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io.WriteCloser
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compressedio.Flusher
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Len() int
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Cap() int
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Bytes() []byte
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Reset()
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Compressed() bool
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}
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func newInterceptBuffer(chunkSize int, compressType compressedio.CompressType) interceptBuffer {
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if compressType == compressedio.NoCompression {
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return newPlainBuffer(chunkSize)
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}
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return compressedio.NewBuffer(chunkSize, compressType)
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}
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type plainBuffer struct {
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*bytes.Buffer
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}
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func (*plainBuffer) Flush() error {
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return nil
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}
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func (*plainBuffer) Close() error {
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return nil
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}
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func (*plainBuffer) Compressed() bool {
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return false
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}
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func newPlainBuffer(chunkSize int) *plainBuffer {
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return &plainBuffer{bytes.NewBuffer(make([]byte, 0, chunkSize))}
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}
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// BufferedWriter is a buffered writer
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type BufferedWriter struct {
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buf interceptBuffer
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writer Writer
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accessRec *recording.AccessStats
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}
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// Write implements Writer.
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func (u *BufferedWriter) Write(ctx context.Context, p []byte) (int, error) {
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n, err := u.write0(ctx, p)
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u.accessRec.RecWrite(n)
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return n, errors.Trace(err)
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}
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func (u *BufferedWriter) write0(ctx context.Context, p []byte) (int, error) {
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bytesWritten := 0
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for u.buf.Len()+len(p) > u.buf.Cap() {
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// We won't fit p in this chunk
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// Is this chunk full?
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chunkToFill := u.buf.Cap() - u.buf.Len()
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if chunkToFill > 0 {
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// It's not full so we write enough of p to fill it
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prewrite := p[0:chunkToFill]
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w, err := u.buf.Write(prewrite)
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bytesWritten += w
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if err != nil {
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return bytesWritten, errors.Trace(err)
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}
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p = p[w:]
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// continue buf because compressed data size may be less than Cap - Len
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if u.buf.Compressed() {
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continue
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}
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}
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_ = u.buf.Flush()
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err := u.uploadChunk(ctx)
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if err != nil {
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return 0, errors.Trace(err)
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}
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}
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w, err := u.buf.Write(p)
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bytesWritten += w
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return bytesWritten, errors.Trace(err)
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}
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func (u *BufferedWriter) uploadChunk(ctx context.Context) error {
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if u.buf.Len() == 0 {
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return nil
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}
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b := u.buf.Bytes()
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u.buf.Reset()
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_, err := u.writer.Write(ctx, b)
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return errors.Trace(err)
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}
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// Close implements Writer.
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func (u *BufferedWriter) Close(ctx context.Context) error {
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u.buf.Close()
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err := u.uploadChunk(ctx)
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if err != nil {
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return errors.Trace(err)
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}
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return u.writer.Close(ctx)
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}
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// GetWriter get the underlying writer.
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func (u *BufferedWriter) GetWriter() Writer {
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return u.writer
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}
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// NewUploaderWriter wraps the Writer interface over an uploader.
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func NewUploaderWriter(writer Writer, chunkSize int, compressType compressedio.CompressType) Writer {
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return NewBufferedWriter(writer, chunkSize, compressType, nil)
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}
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// NewBufferedWriter is used to build a buffered writer.
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func NewBufferedWriter(writer Writer, chunkSize int, compressType compressedio.CompressType, accessRec *recording.AccessStats) *BufferedWriter {
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return &BufferedWriter{
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writer: writer,
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buf: newInterceptBuffer(chunkSize, compressType),
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accessRec: accessRec,
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}
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}
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