边缘节点支持设置多个缓存目录

internal/caches/file_dir.go

@@ -0,0 +1,11 @@
+// Copyright 2022 Liuxiangchao iwind.liu@gmail.com. All rights reserved. Official site: https://goedge.cn .
+
+package caches
+
+import "github.com/TeaOSLab/EdgeCommon/pkg/serverconfigs/shared"
+
+type FileDir struct {
+	Path     string
+	Capacity *shared.SizeCapacity
+	IsFull   bool
+}

internal/caches/manager.go

@@ -24,7 +24,8 @@ func init() {
 type Manager struct {
 	// 全局配置
 	MaxDiskCapacity   *shared.SizeCapacity
-	DiskDir           string
+	MainDiskDir       string
+	SubDiskDirs       []*serverconfigs.CacheDir
 	MaxMemoryCapacity *shared.SizeCapacity
 
 	policyMap  map[int64]*serverconfigs.HTTPCachePolicy // policyId => []*Policy
@@ -47,12 +48,10 @@ func (this *Manager) UpdatePolicies(newPolicies []*serverconfigs.HTTPCachePolicy
 	this.locker.Lock()
 	defer this.locker.Unlock()
 
-	newPolicyIds := []int64{}
+	var newPolicyIds = []int64{}
 	for _, policy := range newPolicies {
 		// 使用节点单独的缓存目录
-		if len(this.DiskDir) > 0 {
+		policy.UpdateDiskDir(this.MainDiskDir, this.SubDiskDirs)
-			policy.UpdateDiskDir(this.DiskDir)
-		}
 
 		newPolicyIds = append(newPolicyIds, policy.Id)
 	}

internal/caches/storage_file.go

@@ -93,7 +93,10 @@ type FileStorage struct {
 
 	openFileCache *OpenFileCache
 
-	diskIsFull bool
+	mainDir        string
+	mainDiskIsFull bool
+
+	subDirs []*FileDir
 }
 
 func NewFileStorage(policy *serverconfigs.HTTPCachePolicy) *FileStorage {
@@ -157,6 +160,16 @@ func (this *FileStorage) UpdatePolicy(newPolicy *serverconfigs.HTTPCachePolicy)
 		return
 	}
 
+	var subDirs = []*FileDir{}
+	for _, subDir := range newOptions.SubDirs {
+		subDirs = append(subDirs, &FileDir{
+			Path:     subDir.Path,
+			Capacity: subDir.Capacity,
+			IsFull:   false,
+		})
+	}
+	this.checkDiskSpace()
+
 	err = newOptions.Init()
 	if err != nil {
 		remotelogs.Error("CACHE", "update policy '"+types.String(this.policy.Id)+"' failed: init options failed: "+err.Error())
@@ -219,6 +232,19 @@ func (this *FileStorage) Init() error {
 	this.options.Dir = filepath.Clean(this.options.Dir)
 	var dir = this.options.Dir
 
+	var subDirs = []*FileDir{}
+	for _, subDir := range this.options.SubDirs {
+		subDirs = append(subDirs, &FileDir{
+			Path:     subDir.Path,
+			Capacity: subDir.Capacity,
+			IsFull:   false,
+		})
+	}
+	this.subDirs = subDirs
+	if len(subDirs) > 0 {
+		this.checkDiskSpace()
+	}
+
 	if len(dir) == 0 {
 		return errors.New("[CACHE]cache storage dir can not be empty")
 	}
@@ -321,7 +347,7 @@ func (this *FileStorage) openReader(key string, allowMemory bool, useStale bool,
 		}
 	}
 
-	hash, path := this.keyPath(key)
+	hash, path, _ := this.keyPath(key)
 
 	// 检查文件记录是否已过期
 	if !useStale {
@@ -404,11 +430,6 @@ func (this *FileStorage) openWriter(key string, expiredAt int64, status int, siz
 		return nil, ErrWritingUnavailable
 	}
 
-	// 当前磁盘可用容量是否严重不足
-	if this.diskIsFull {
-		return nil, NewCapacityError("the disk is full")
-	}
-
 	// 是否已忽略
 	if this.ignoreKeys.Has(key) {
 		return nil, ErrEntityTooLarge
@@ -475,8 +496,12 @@ func (this *FileStorage) openWriter(key string, expiredAt int64, status int, siz
 
 	var hash = stringutil.Md5(key)
 
+	dir, diskIsFull := this.subDir(hash)
+	if diskIsFull {
+		return nil, NewCapacityError("the disk is full")
+	}
+
 	// TODO 可以只stat一次
-	var dir = this.options.Dir + "/p" + strconv.FormatInt(this.policy.Id, 10) + "/" + hash[:2] + "/" + hash[2:4]
 	_, err = os.Stat(dir)
 	if err != nil {
 		if !os.IsNotExist(err) {
@@ -680,7 +705,7 @@ func (this *FileStorage) Delete(key string) error {
 		_ = memoryStorage.Delete(key)
 	})
 
-	hash, path := this.keyPath(key)
+	hash, path, _ := this.keyPath(key)
 	err := this.list.Remove(hash)
 	if err != nil {
 		return err
@@ -720,7 +745,17 @@ func (this *FileStorage) CleanAll() error {
 
 	// 删除缓存和目录
 	// 不能直接删除子目录，比较危险
-	dir := this.dir()
+
+	var rootDirs = []string{this.options.Dir}
+	var subDirs = this.subDirs // copy slice
+	if len(subDirs) > 0 {
+		for _, subDir := range subDirs {
+			rootDirs = append(rootDirs, subDir.Path)
+		}
+	}
+
+	for _, rootDir := range rootDirs {
+		var dir = rootDir + "/p" + types.String(this.policy.Id)
 		fp, err := os.Open(dir)
 		if err != nil {
 			return err
@@ -770,6 +805,7 @@ func (this *FileStorage) CleanAll() error {
 				remotelogs.Warn("CACHE", "delete '*-deleted' dirs failed: "+err.Error())
 			}
 		})
+	}
 
 	return nil
 }
@@ -802,7 +838,7 @@ func (this *FileStorage) Purge(keys []string, urlType string) error {
 
 	// URL
 	for _, key := range keys {
-		hash, path := this.keyPath(key)
+		hash, path, _ := this.keyPath(key)
 		err := this.removeCacheFile(path)
 		if err != nil && !os.IsNotExist(err) {
 			return err
@@ -873,25 +909,22 @@ func (this *FileStorage) CanSendfile() bool {
 	return this.options.EnableSendfile
 }
 
-// 绝对路径
-func (this *FileStorage) dir() string {
-	return this.options.Dir + "/p" + strconv.FormatInt(this.policy.Id, 10) + "/"
-}
-
 // 获取Key对应的文件路径
-func (this *FileStorage) keyPath(key string) (hash string, path string) {
+func (this *FileStorage) keyPath(key string) (hash string, path string, diskIsFull bool) {
 	hash = stringutil.Md5(key)
-	dir := this.options.Dir + "/p" + strconv.FormatInt(this.policy.Id, 10) + "/" + hash[:2] + "/" + hash[2:4]
+	var dir string
+	dir, diskIsFull = this.subDir(hash)
 	path = dir + "/" + hash + ".cache"
 	return
 }
 
 // 获取Hash对应的文件路径
-func (this *FileStorage) hashPath(hash string) (path string) {
+func (this *FileStorage) hashPath(hash string) (path string, diskIsFull bool) {
 	if len(hash) != 32 {
-		return ""
+		return "", false
 	}
-	dir := this.options.Dir + "/p" + strconv.FormatInt(this.policy.Id, 10) + "/" + hash[:2] + "/" + hash[2:4]
+	var dir string
+	dir, diskIsFull = this.subDir(hash)
 	path = dir + "/" + hash + ".cache"
 	return
 }
@@ -949,6 +982,7 @@ func (this *FileStorage) initList() error {
 }
 
 // 清理任务
+// TODO purge每个分区
 func (this *FileStorage) purgeLoop() {
 	// 检查磁盘剩余空间
 	this.checkDiskSpace()
@@ -960,7 +994,19 @@ func (this *FileStorage) purgeLoop() {
 	if lfuFreePercent <= 0 {
 		lfuFreePercent = 5
 	}
-	if this.diskIsFull {
+
+	var hasFullDisk = this.mainDiskIsFull
+	if !hasFullDisk {
+		var subDirs = this.subDirs // copy slice
+		for _, subDir := range subDirs {
+			if subDir.IsFull {
+				hasFullDisk = true
+				break
+			}
+		}
+	}
+
+	if hasFullDisk {
 		startLFU = true
 	} else {
 		var usedPercent = float32(this.TotalDiskSize()*100) / float32(capacityBytes)
@@ -993,7 +1039,7 @@ func (this *FileStorage) purgeLoop() {
 		}
 		for i := 0; i < times; i++ {
 			countFound, err := this.list.Purge(purgeCount, func(hash string) error {
-				path := this.hashPath(hash)
+				path, _ := this.hashPath(hash)
 				err := this.removeCacheFile(path)
 				if err != nil && !os.IsNotExist(err) {
 					remotelogs.Error("CACHE", "purge '"+path+"' error: "+err.Error())
@@ -1027,7 +1073,7 @@ func (this *FileStorage) purgeLoop() {
 
 				remotelogs.Println("CACHE", "LFU purge policy '"+this.policy.Name+"' id: "+types.String(this.policy.Id)+", count: "+types.String(count))
 				err := this.list.PurgeLFU(count, func(hash string) error {
-					path := this.hashPath(hash)
+					path, _ := this.hashPath(hash)
 					err := this.removeCacheFile(path)
 					if err != nil && !os.IsNotExist(err) {
 						remotelogs.Error("CACHE", "purge '"+path+"' error: "+err.Error())
@@ -1354,7 +1400,55 @@ func (this *FileStorage) checkDiskSpace() {
 		err := unix.Statfs(this.options.Dir, &stat)
 		if err == nil {
 			var availableBytes = stat.Bavail * uint64(stat.Bsize)
-			this.diskIsFull = availableBytes < MinDiskSpace
+			this.mainDiskIsFull = availableBytes < MinDiskSpace
+		}
+	}
+	var subDirs = this.subDirs // copy slice
+	for _, subDir := range subDirs {
+		var stat unix.Statfs_t
+		err := unix.Statfs(subDir.Path, &stat)
+		if err == nil {
+			var availableBytes = stat.Bavail * uint64(stat.Bsize)
+			subDir.IsFull = availableBytes < MinDiskSpace
 		}
 	}
 }
+
+// 获取目录
+func (this *FileStorage) subDir(hash string) (dirPath string, dirIsFull bool) {
+	var suffix = "/p" + types.String(this.policy.Id) + "/" + hash[:2] + "/" + hash[2:4]
+
+	if len(hash) < 4 {
+		return this.options.Dir + suffix, this.mainDiskIsFull
+	}
+
+	var subDirs = this.subDirs // copy slice
+	var countSubDirs = len(subDirs)
+	if countSubDirs == 0 {
+		return this.options.Dir + suffix, this.mainDiskIsFull
+	}
+
+	countSubDirs++ // add main dir
+
+	// 最多只支持16个目录
+	if countSubDirs > 16 {
+		countSubDirs = 16
+	}
+
+	var dirIndex = this.charCode(hash[0]) % uint8(countSubDirs)
+	if dirIndex == 0 {
+		return this.options.Dir + suffix, this.mainDiskIsFull
+	}
+	var subDir = subDirs[dirIndex-1]
+	return subDir.Path + suffix, subDir.IsFull
+}
+
+func (this *FileStorage) charCode(r byte) uint8 {
+	if r >= '0' && r <= '9' {
+		return r - '0'
+	}
+	if r >= 'a' && r <= 'z' {
+		return r - 'a' + 10
+	}
+	return 0
+}

internal/nodes/node.go

@@ -37,6 +37,7 @@ import (
 	"os"
 	"os/exec"
 	"os/signal"
+	"path/filepath"
 	"runtime"
 	"runtime/debug"
 	"sort"
@@ -985,7 +986,19 @@ func (this *Node) onReload(config *nodeconfigs.NodeConfig) {
 	// 缓存策略
 	caches.SharedManager.MaxDiskCapacity = config.MaxCacheDiskCapacity
 	caches.SharedManager.MaxMemoryCapacity = config.MaxCacheMemoryCapacity
-	caches.SharedManager.DiskDir = config.CacheDiskDir
+	caches.SharedManager.MainDiskDir = config.CacheDiskDir
+
+	var subDirs = config.CacheDiskSubDirs
+	for _, subDir := range subDirs {
+		subDir.Path = filepath.Clean(subDir.Path)
+	}
+	if len(subDirs) > 0 {
+		sort.Slice(subDirs, func(i, j int) bool {
+			return subDirs[i].Path < subDirs[j].Path
+		})
+	}
+	caches.SharedManager.SubDiskDirs = subDirs
+
 	if len(config.HTTPCachePolicies) > 0 {
 		caches.SharedManager.UpdatePolicies(config.HTTPCachePolicies)
 	} else {