bfs: 增加读写线程限制

internal/utils/bfs/blocks_file.go

@@ -33,6 +33,8 @@ type BlocksFile struct {
 
 	writtenBytes int64
 	syncAt       time.Time
+
+	readerPool chan *FileReader
 }
 
 func NewBlocksFileWithRawFile(fp *os.File, options *BlockFileOptions) (*BlocksFile, error) {
@@ -52,7 +54,9 @@ func NewBlocksFileWithRawFile(fp *os.File, options *BlockFileOptions) (*BlocksFi
 		return nil, fmt.Errorf("load '%s' failed: %w", mFilename, err)
 	}
 
+	AckReadThread()
 	_, err = fp.Seek(0, io.SeekEnd)
+	ReleaseReadThread()
 	if err != nil {
 		_ = fp.Close()
 		_ = mFile.Close()
@@ -60,11 +64,12 @@ func NewBlocksFileWithRawFile(fp *os.File, options *BlockFileOptions) (*BlocksFi
 	}
 
 	return &BlocksFile{
-		fp:     fp,
-		mFile:  mFile,
-		mu:     mu,
-		opt:    options,
-		syncAt: time.Now(),
+		fp:         fp,
+		mFile:      mFile,
+		mu:         mu,
+		opt:        options,
+		syncAt:     time.Now(),
+		readerPool: make(chan *FileReader, 32),
 	}, nil
 }
 
@@ -112,7 +117,9 @@ func (this *BlocksFile) Write(hash string, blockType BlockType, b []byte, origin
 		return
 	}
 
+	AckWriteThread()
 	n, err = this.fp.Write(b)
+	ReleaseWriteThread()
 
 	if err == nil {
 		if n > 0 {
@@ -156,8 +163,6 @@ func (this *BlocksFile) OpenFileReader(fileHash string, isPartial bool) (*FileRe
 		return nil, err
 	}
 
-	// TODO 需要设置单个BFile文件的maxOpenFiles
-
 	this.mu.RLock()
 	err = this.checkStatus()
 	this.mu.RUnlock()
@@ -181,6 +186,14 @@ func (this *BlocksFile) OpenFileReader(fileHash string, isPartial bool) (*FileRe
 		return nil, os.ErrNotExist
 	}
 
+	// 先尝试从Pool中获取
+	select {
+	case reader := <-this.readerPool:
+		reader.Reset(header)
+		return reader, nil
+	default:
+	}
+
 	fp, err := os.Open(this.fp.Name())
 	if err != nil {
 		return nil, err
@@ -188,6 +201,15 @@ func (this *BlocksFile) OpenFileReader(fileHash string, isPartial bool) (*FileRe
 	return NewFileReader(this, fp, header), nil
 }
 
+func (this *BlocksFile) CloseFileReader(reader *FileReader) error {
+	select {
+	case this.readerPool <- reader:
+		return nil
+	default:
+		return reader.Free()
+	}
+}
+
 func (this *BlocksFile) ExistFile(fileHash string) bool {
 	err := CheckHashErr(fileHash)
 	if err != nil {
@@ -246,6 +268,8 @@ func (this *BlocksFile) RemoveAll() error {
 	this.isClosed = true
 
 	_ = this.mFile.RemoveAll()
+
+	this.closeReaderPool()
 	_ = this.fp.Close()
 	return os.Remove(this.fp.Name())
 }
@@ -263,6 +287,8 @@ func (this *BlocksFile) Close() error {
 
 	_ = this.mFile.Close()
 
+	this.closeReaderPool()
+
 	return this.fp.Close()
 }
 
@@ -286,7 +312,9 @@ func (this *BlocksFile) sync(force bool) error {
 
 	this.writtenBytes = 0
 
+	AckWriteThread()
 	err := this.fp.Sync()
+	ReleaseWriteThread()
 	if err != nil {
 		return err
 	}
@@ -299,3 +327,14 @@ func (this *BlocksFile) sync(force bool) error {
 
 	return nil
 }
+
+func (this *BlocksFile) closeReaderPool() {
+	for {
+		select {
+		case reader := <-this.readerPool:
+			_ = reader.Free()
+		default:
+			return
+		}
+	}
+}

internal/utils/bfs/blocks_file_options.go

@@ -4,7 +4,6 @@ package bfs
 
 type BlockFileOptions struct {
 	BytesPerSync int64
-	MaxOpenFiles int // TODO 需要实现，主要用于OpenFileReader
 }
 
 func (this *BlockFileOptions) EnsureDefaults() {

internal/utils/bfs/file_reader.go

@@ -10,11 +10,12 @@ import (
 )
 
 type FileReader struct {
-	bFile      *BlocksFile
-	fp         *os.File
-	fileHeader *FileHeader
+	bFile *BlocksFile
+	fp    *os.File
 
-	pos int64
+	fileHeader *FileHeader
+	pos        int64
+	bPos       int64
 }
 
 func NewFileReader(bFile *BlocksFile, fp *os.File, fileHeader *FileHeader) *FileReader {
@@ -22,6 +23,7 @@ func NewFileReader(bFile *BlocksFile, fp *os.File, fileHeader *FileHeader) *File
 		bFile:      bFile,
 		fp:         fp,
 		fileHeader: fileHeader,
+		bPos:       -1,
 	}
 }
 
@@ -61,11 +63,35 @@ func (this *FileReader) ReadAt(b []byte, offset int64) (n int, err error) {
 		bufLen = int(bTo - bFrom)
 	}
 
-	n, err = this.fp.ReadAt(b[:bufLen], bFrom)
+	AckReadThread()
+	defer ReleaseReadThread()
+
+	if bFrom == this.bPos { // read continuous
+		n, err = this.fp.Read(b[:bufLen])
+	} else { // read from offset
+		_, err = this.fp.Seek(bFrom, io.SeekStart)
+		if err != nil {
+			return
+		}
+		n, err = this.fp.Read(b[:bufLen])
+	}
+	if n > 0 {
+		this.bPos = bFrom + int64(n)
+	}
 
 	return
 }
 
+func (this *FileReader) Reset(fileHeader *FileHeader) {
+	this.fileHeader = fileHeader
+	this.pos = 0
+	this.bPos = -1
+}
+
 func (this *FileReader) Close() error {
+	return this.bFile.CloseFileReader(this)
+}
+
+func (this *FileReader) Free() error {
 	return this.fp.Close()
 }

internal/utils/bfs/meta_file.go

@@ -52,7 +52,9 @@ func OpenMetaFile(filename string, mu *sync.RWMutex) (*MetaFile, error) {
 }
 
 func (this *MetaFile) load() error {
+	AckReadThread()
 	_, err := this.fp.Seek(0, io.SeekStart)
+	ReleaseReadThread()
 	if err != nil {
 		return err
 	}
@@ -62,7 +64,9 @@ func (this *MetaFile) load() error {
 	var buf = make([]byte, 4<<10)
 	var blockBytes []byte
 	for {
+		AckReadThread()
 		n, readErr := this.fp.Read(buf)
+		ReleaseReadThread()
 		if n > 0 {
 			blockBytes = append(blockBytes, buf[:n]...)
 			for len(blockBytes) > 4 {
@@ -180,12 +184,17 @@ func (this *MetaFile) WriteClose(hash string, headerSize int64, bodySize int64)
 	this.mu.Lock()
 	defer this.mu.Unlock()
 
+	AckReadThread()
 	_, err = this.fp.Seek(0, io.SeekEnd)
+	ReleaseReadThread()
 	if err != nil {
 		return err
 	}
 
+	AckWriteThread()
 	_, err = this.fp.Write(blockBytes)
+	ReleaseWriteThread()
+
 	this.isModified = true
 	return err
 }
@@ -205,7 +214,9 @@ func (this *MetaFile) RemoveFile(hash string) error {
 			return err
 		}
 
+		AckWriteThread()
 		_, err = this.fp.Write(blockBytes)
+		ReleaseWriteThread()
 		if err != nil {
 			return err
 		}
@@ -263,17 +274,23 @@ func (this *MetaFile) Compact() error {
 		buf.Write(blockBytes)
 	}
 
+	AckWriteThread()
 	err := this.fp.Truncate(int64(buf.Len()))
+	ReleaseWriteThread()
 	if err != nil {
 		return err
 	}
 
+	AckReadThread()
 	_, err = this.fp.Seek(0, io.SeekStart)
+	ReleaseReadThread()
 	if err != nil {
 		return err
 	}
 
+	AckWriteThread()
 	_, err = this.fp.Write(buf.Bytes())
+	ReleaseWriteThread()
 	this.isModified = true
 	return err
 }
@@ -283,7 +300,9 @@ func (this *MetaFile) SyncUnsafe() error {
 		return nil
 	}
 
+	AckWriteThread()
 	err := this.fp.Sync()
+	ReleaseWriteThread()
 	if err != nil {
 		return err
 	}

internal/utils/bfs/thread_limiters.go

@@ -0,0 +1,25 @@
+// Copyright 2024 GoEdge CDN goedge.cdn@gmail.com. All rights reserved. Official site: https://goedge.cn .
+
+package bfs
+
+import "github.com/TeaOSLab/EdgeNode/internal/zero"
+
+// TODO 使用atomic代替channel？需要使用基准测试对比性能
+var readThreadsLimiter = make(chan zero.Zero, 16)
+var writeThreadsLimiter = make(chan zero.Zero, 16)
+
+func AckReadThread() {
+	readThreadsLimiter <- zero.Zero{}
+}
+
+func ReleaseReadThread() {
+	<-readThreadsLimiter
+}
+
+func AckWriteThread() {
+	writeThreadsLimiter <- zero.Zero{}
+}
+
+func ReleaseWriteThread() {
+	<-writeThreadsLimiter
+}