mirror of
https://github.com/TeaOSLab/EdgeNode.git
synced 2025-11-04 07:40:56 +08:00
369 lines
7.1 KiB
Go
369 lines
7.1 KiB
Go
// Copyright 2024 GoEdge CDN goedge.cdn@gmail.com. All rights reserved. Official site: https://goedge.cn .
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package bfs
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import (
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"errors"
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fsutils "github.com/TeaOSLab/EdgeNode/internal/utils/fs"
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"github.com/TeaOSLab/EdgeNode/internal/utils/linkedlist"
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"github.com/TeaOSLab/EdgeNode/internal/zero"
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"log"
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"runtime"
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"sync"
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"time"
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)
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func IsEnabled() bool {
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return runtime.GOARCH == "amd64" || runtime.GOARCH == "arm64"
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}
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// FS 文件系统对象
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type FS struct {
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dir string
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opt *FSOptions
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bMap map[string]*BlocksFile // name => *BlocksFile
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bList *linkedlist.List[string] // [bName]
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bItemMap map[string]*linkedlist.Item[string]
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closingBMap map[string]zero.Zero // filename => Zero
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closingBChan chan *BlocksFile
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mu *sync.RWMutex
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isClosed bool
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syncTicker *time.Ticker
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locker *fsutils.Locker
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}
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// OpenFS 打开文件系统
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func OpenFS(dir string, options *FSOptions) (*FS, error) {
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if !IsEnabled() {
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return nil, errors.New("the fs only works under 64 bit system")
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}
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if options == nil {
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options = DefaultFSOptions
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} else {
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options.EnsureDefaults()
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}
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var locker = fsutils.NewLocker(dir + "/fs")
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err := locker.Lock()
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if err != nil {
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return nil, err
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}
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var fs = &FS{
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dir: dir,
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bMap: map[string]*BlocksFile{},
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bList: linkedlist.NewList[string](),
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bItemMap: map[string]*linkedlist.Item[string]{},
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closingBMap: map[string]zero.Zero{},
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closingBChan: make(chan *BlocksFile, 32),
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mu: &sync.RWMutex{},
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opt: options,
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syncTicker: time.NewTicker(1 * time.Second),
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locker: locker,
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}
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go fs.init()
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return fs, nil
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}
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func (this *FS) init() {
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go func() {
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// sync in background
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for range this.syncTicker.C {
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this.syncLoop()
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}
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}()
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go func() {
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for {
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this.processClosingBFiles()
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}
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}()
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}
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// OpenFileWriter 打开文件写入器
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func (this *FS) OpenFileWriter(hash string, bodySize int64, isPartial bool) (*FileWriter, error) {
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if this.isClosed {
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return nil, errors.New("the fs closed")
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}
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if isPartial && bodySize <= 0 {
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return nil, errors.New("invalid body size for partial content")
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}
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bFile, err := this.openBFileForHashWriting(hash)
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if err != nil {
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return nil, err
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}
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return bFile.OpenFileWriter(hash, bodySize, isPartial)
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}
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// OpenFileReader 打开文件读取器
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func (this *FS) OpenFileReader(hash string, isPartial bool) (*FileReader, error) {
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if this.isClosed {
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return nil, errors.New("the fs closed")
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}
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bFile, err := this.openBFileForHashReading(hash)
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if err != nil {
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return nil, err
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}
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return bFile.OpenFileReader(hash, isPartial)
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}
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func (this *FS) ExistFile(hash string) (bool, error) {
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if this.isClosed {
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return false, errors.New("the fs closed")
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}
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bFile, err := this.openBFileForHashReading(hash)
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if err != nil {
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return false, err
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}
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return bFile.ExistFile(hash), nil
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}
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func (this *FS) RemoveFile(hash string) error {
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if this.isClosed {
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return errors.New("the fs closed")
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}
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bFile, err := this.openBFileForHashWriting(hash)
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if err != nil {
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return err
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}
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return bFile.RemoveFile(hash)
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}
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func (this *FS) Close() error {
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if this.isClosed {
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return nil
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}
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this.isClosed = true
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close(this.closingBChan)
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this.syncTicker.Stop()
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var lastErr error
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this.mu.Lock()
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for _, bFile := range this.bMap {
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err := bFile.Close()
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if err != nil {
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lastErr = err
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}
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}
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this.mu.Unlock()
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err := this.locker.Release()
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if err != nil {
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lastErr = err
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}
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return lastErr
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}
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func (this *FS) TestBMap() map[string]*BlocksFile {
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return this.bMap
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}
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func (this *FS) TestBList() *linkedlist.List[string] {
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return this.bList
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}
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func (this *FS) bPathForHash(hash string) (path string, bName string, err error) {
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err = CheckHashErr(hash)
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if err != nil {
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return "", "", err
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}
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return this.dir + "/" + hash[:2] + "/" + hash[2:4] + BFileExt, hash[:4], nil
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}
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func (this *FS) syncLoop() {
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if this.isClosed {
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return
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}
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if this.opt.SyncTimeout <= 0 {
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return
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}
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var maxSyncFiles = this.opt.MaxSyncFiles
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if maxSyncFiles <= 0 {
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maxSyncFiles = 32
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}
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var bFiles []*BlocksFile
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this.mu.RLock()
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for _, bFile := range this.bMap {
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if time.Since(bFile.SyncAt()) > this.opt.SyncTimeout {
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bFiles = append(bFiles, bFile)
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maxSyncFiles--
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if maxSyncFiles <= 0 {
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break
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}
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}
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}
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this.mu.RUnlock()
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for _, bFile := range bFiles {
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err := bFile.ForceSync()
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if err != nil {
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// TODO 可以在options自定义一个logger
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log.Println("BFS", "sync failed: "+err.Error())
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}
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}
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}
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func (this *FS) openBFileForHashWriting(hash string) (*BlocksFile, error) {
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err := CheckHashErr(hash)
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if err != nil {
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return nil, err
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}
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bPath, bName, err := this.bPathForHash(hash)
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if err != nil {
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return nil, err
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}
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this.mu.RLock()
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bFile, ok := this.bMap[bName]
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this.mu.RUnlock()
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if ok {
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// 调整当前BFile所在位置
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this.mu.Lock()
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item, itemOk := this.bItemMap[bName]
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if itemOk {
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this.bList.Remove(item)
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this.bList.Push(item)
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}
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this.mu.Unlock()
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return bFile, nil
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}
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return this.openBFile(bPath, bName)
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}
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func (this *FS) openBFileForHashReading(hash string) (*BlocksFile, error) {
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err := CheckHashErr(hash)
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if err != nil {
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return nil, err
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}
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bPath, bName, err := this.bPathForHash(hash)
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if err != nil {
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return nil, err
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}
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this.mu.RLock()
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bFile, ok := this.bMap[bName]
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this.mu.RUnlock()
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if ok {
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// 调整当前BFile所在位置
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this.mu.Lock()
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item, itemOk := this.bItemMap[bName]
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if itemOk {
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this.bList.Remove(item)
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this.bList.Push(item)
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}
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this.mu.Unlock()
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return bFile, nil
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}
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return this.openBFile(bPath, bName)
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}
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func (this *FS) openBFile(bPath string, bName string) (*BlocksFile, error) {
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// check closing queue
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this.mu.RLock()
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_, isClosing := this.closingBMap[bPath]
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this.mu.RUnlock()
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if isClosing {
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var maxWaits = 30_000
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for {
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this.mu.RLock()
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_, isClosing = this.closingBMap[bPath]
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this.mu.RUnlock()
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if !isClosing {
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break
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}
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time.Sleep(1 * time.Millisecond)
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maxWaits--
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if maxWaits < 0 {
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return nil, errors.New("open blocks file timeout")
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}
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}
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}
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this.mu.Lock()
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defer this.mu.Unlock()
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// lookup again
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bFile, ok := this.bMap[bName]
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if ok {
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return bFile, nil
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}
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bFile, err := OpenBlocksFile(bPath, &BlockFileOptions{
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BytesPerSync: this.opt.BytesPerSync,
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})
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if err != nil {
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return nil, err
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}
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this.bMap[bName] = bFile
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// 加入到列表中
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var item = linkedlist.NewItem(bName)
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this.bList.Push(item)
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this.bItemMap[bName] = item
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// 检查是否超出maxOpenFiles
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if this.bList.Len() > this.opt.MaxOpenFiles {
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var firstBName = this.bList.Shift().Value
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var firstBFile = this.bMap[firstBName]
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delete(this.bMap, firstBName)
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delete(this.bItemMap, firstBName)
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this.closingBMap[firstBFile.Filename()] = zero.Zero{}
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// MUST run in goroutine
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go func() {
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// 因为 closingBChan 可能已经关闭
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defer func() {
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recover()
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}()
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this.closingBChan <- firstBFile
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}()
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}
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return bFile, nil
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}
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// 处理关闭中的 BFile 们
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func (this *FS) processClosingBFiles() {
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if this.isClosed {
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return
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}
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var bFile = <-this.closingBChan
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if bFile == nil {
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return
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}
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_ = bFile.Close()
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this.mu.Lock()
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delete(this.closingBMap, bFile.Filename())
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this.mu.Unlock()
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}
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