mirror of
https://github.com/woodchen-ink/proxy-go.git
synced 2025-07-18 00:21:56 +08:00
656 lines
17 KiB
Go
656 lines
17 KiB
Go
package cache
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import (
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"crypto/sha256"
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"encoding/hex"
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"encoding/json"
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"fmt"
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"hash/fnv"
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"log"
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"net/http"
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"os"
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"path/filepath"
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"proxy-go/internal/config"
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"proxy-go/internal/utils"
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"sort"
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"strings"
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"sync"
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"sync/atomic"
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"time"
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)
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// CacheKey 用于标识缓存项的唯一键
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type CacheKey struct {
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URL string
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AcceptHeaders string
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UserAgent string
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}
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// String 实现 Stringer 接口，用于生成唯一的字符串表示
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func (k CacheKey) String() string {
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return fmt.Sprintf("%s|%s|%s", k.URL, k.AcceptHeaders, k.UserAgent)
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}
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// Equal 比较两个 CacheKey 是否相等
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func (k CacheKey) Equal(other CacheKey) bool {
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return k.URL == other.URL &&
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k.AcceptHeaders == other.AcceptHeaders &&
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k.UserAgent == other.UserAgent
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}
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// Hash 生成 CacheKey 的哈希值
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func (k CacheKey) Hash() uint64 {
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h := fnv.New64a()
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h.Write([]byte(k.String()))
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return h.Sum64()
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}
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// CacheItem 表示一个缓存项
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type CacheItem struct {
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FilePath string
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ContentType string
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ContentEncoding string
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Size int64
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LastAccess time.Time
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Hash string
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CreatedAt time.Time
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AccessCount int64
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}
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// CacheStats 缓存统计信息
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type CacheStats struct {
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TotalItems int `json:"total_items"` // 缓存项数量
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TotalSize int64 `json:"total_size"` // 总大小
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HitCount int64 `json:"hit_count"` // 命中次数
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MissCount int64 `json:"miss_count"` // 未命中次数
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HitRate float64 `json:"hit_rate"` // 命中率
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BytesSaved int64 `json:"bytes_saved"` // 节省的带宽
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Enabled bool `json:"enabled"` // 缓存开关状态
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}
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// CacheManager 缓存管理器
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type CacheManager struct {
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cacheDir string
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items sync.Map
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maxAge time.Duration
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cleanupTick time.Duration
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maxCacheSize int64
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enabled atomic.Bool // 缓存开关
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hitCount atomic.Int64 // 命中计数
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missCount atomic.Int64 // 未命中计数
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bytesSaved atomic.Int64 // 节省的带宽
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cleanupTimer *time.Ticker // 添加清理定时器
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stopCleanup chan struct{} // 添加停止信号通道
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// ExtensionMatcher缓存
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extensionMatcherCache *ExtensionMatcherCache
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}
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// NewCacheManager 创建新的缓存管理器
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func NewCacheManager(cacheDir string) (*CacheManager, error) {
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if err := os.MkdirAll(cacheDir, 0755); err != nil {
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return nil, fmt.Errorf("failed to create cache directory: %v", err)
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}
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cm := &CacheManager{
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cacheDir: cacheDir,
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maxAge: 30 * time.Minute,
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cleanupTick: 5 * time.Minute,
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maxCacheSize: 10 * 1024 * 1024 * 1024, // 10GB
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stopCleanup: make(chan struct{}),
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// 初始化ExtensionMatcher缓存
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extensionMatcherCache: NewExtensionMatcherCache(),
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}
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cm.enabled.Store(true) // 默认启用缓存
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// 尝试加载配置
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if err := cm.loadConfig(); err != nil {
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log.Printf("[Cache] Failed to load config: %v, using default values", err)
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}
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// 启动时清理过期和临时文件
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if err := cm.cleanStaleFiles(); err != nil {
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log.Printf("[Cache] Failed to clean stale files: %v", err)
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}
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// 启动清理协程
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cm.startCleanup()
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return cm, nil
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}
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// GenerateCacheKey 生成缓存键
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func (cm *CacheManager) GenerateCacheKey(r *http.Request) CacheKey {
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// 处理 Vary 头部
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varyHeaders := make([]string, 0)
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for _, vary := range strings.Split(r.Header.Get("Vary"), ",") {
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vary = strings.TrimSpace(vary)
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if vary != "" {
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value := r.Header.Get(vary)
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varyHeaders = append(varyHeaders, vary+"="+value)
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}
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}
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sort.Strings(varyHeaders)
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return CacheKey{
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URL: r.URL.String(),
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AcceptHeaders: r.Header.Get("Accept"),
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UserAgent: r.Header.Get("User-Agent"),
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}
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}
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// Get 获取缓存项
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func (cm *CacheManager) Get(key CacheKey, r *http.Request) (*CacheItem, bool, bool) {
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if !cm.enabled.Load() {
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return nil, false, false
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}
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// 检查缓存项是否存在
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value, ok := cm.items.Load(key)
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if !ok {
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cm.missCount.Add(1)
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return nil, false, false
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}
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item := value.(*CacheItem)
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// 验证文件是否存在
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if _, err := os.Stat(item.FilePath); err != nil {
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cm.items.Delete(key)
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cm.missCount.Add(1)
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return nil, false, false
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}
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// 检查是否过期（使用LastAccess而不是CreatedAt）
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if time.Since(item.LastAccess) > cm.maxAge {
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cm.items.Delete(key)
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os.Remove(item.FilePath)
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cm.missCount.Add(1)
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return nil, false, false
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}
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// 更新访问信息（重置过期时间）
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item.LastAccess = time.Now()
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atomic.AddInt64(&item.AccessCount, 1)
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cm.hitCount.Add(1)
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cm.bytesSaved.Add(item.Size)
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return item, true, false
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}
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// Put 添加缓存项
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func (cm *CacheManager) Put(key CacheKey, resp *http.Response, body []byte) (*CacheItem, error) {
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// 只检查基本的响应状态
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if resp.StatusCode != http.StatusOK {
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return nil, fmt.Errorf("response status not OK")
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}
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// 计算内容哈希
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contentHash := sha256.Sum256(body)
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hashStr := hex.EncodeToString(contentHash[:])
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// 检查是否存在相同哈希的缓存项
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var existingItem *CacheItem
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cm.items.Range(func(k, v interface{}) bool {
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if item := v.(*CacheItem); item.Hash == hashStr {
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if _, err := os.Stat(item.FilePath); err == nil {
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existingItem = item
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return false
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}
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cm.items.Delete(k)
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}
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return true
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})
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if existingItem != nil {
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cm.items.Store(key, existingItem)
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log.Printf("[Cache] HIT %s %s (%s) from %s", resp.Request.Method, key.URL, formatBytes(existingItem.Size), utils.GetRequestSource(resp.Request))
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return existingItem, nil
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}
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// 生成文件名并存储
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fileName := hashStr
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filePath := filepath.Join(cm.cacheDir, fileName)
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if err := os.WriteFile(filePath, body, 0600); err != nil {
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return nil, fmt.Errorf("failed to write cache file: %v", err)
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}
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item := &CacheItem{
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FilePath: filePath,
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ContentType: resp.Header.Get("Content-Type"),
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ContentEncoding: resp.Header.Get("Content-Encoding"),
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Size: int64(len(body)),
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LastAccess: time.Now(),
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Hash: hashStr,
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CreatedAt: time.Now(),
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AccessCount: 1,
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}
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cm.items.Store(key, item)
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method := "GET"
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if resp.Request != nil {
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method = resp.Request.Method
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}
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log.Printf("[Cache] NEW %s %s (%s) from %s", method, key.URL, formatBytes(item.Size), utils.GetRequestSource(resp.Request))
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return item, nil
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}
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// cleanup 定期清理过期的缓存项
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func (cm *CacheManager) cleanup() {
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var totalSize int64
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var keysToDelete []CacheKey
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// 收集需要删除的键和计算总大小
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cm.items.Range(func(k, v interface{}) bool {
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key := k.(CacheKey)
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item := v.(*CacheItem)
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totalSize += item.Size
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if time.Since(item.LastAccess) > cm.maxAge {
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keysToDelete = append(keysToDelete, key)
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}
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return true
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})
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// 如果总大小超过限制，按最后访问时间排序删除
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if totalSize > cm.maxCacheSize {
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var items []*CacheItem
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cm.items.Range(func(k, v interface{}) bool {
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items = append(items, v.(*CacheItem))
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return true
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})
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// 按最后访问时间排序
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sort.Slice(items, func(i, j int) bool {
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return items[i].LastAccess.Before(items[j].LastAccess)
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})
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// 删除最旧的项直到总大小小于限制
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for _, item := range items {
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if totalSize <= cm.maxCacheSize {
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break
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}
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cm.items.Range(func(k, v interface{}) bool {
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if v.(*CacheItem) == item {
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keysToDelete = append(keysToDelete, k.(CacheKey))
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totalSize -= item.Size
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return false
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}
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return true
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})
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}
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}
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// 删除过期和超出大小限制的缓存项
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for _, key := range keysToDelete {
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if item, ok := cm.items.Load(key); ok {
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cacheItem := item.(*CacheItem)
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os.Remove(cacheItem.FilePath)
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cm.items.Delete(key)
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log.Printf("[Cache] DEL %s (expired)", key.URL)
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}
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}
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}
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// formatBytes 格式化字节大小
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func formatBytes(bytes int64) string {
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const (
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KB = 1024
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MB = 1024 * KB
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GB = 1024 * MB
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)
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switch {
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case bytes >= GB:
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return fmt.Sprintf("%.2f GB", float64(bytes)/float64(GB))
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case bytes >= MB:
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return fmt.Sprintf("%.2f MB", float64(bytes)/float64(MB))
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case bytes >= KB:
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return fmt.Sprintf("%.2f KB", float64(bytes)/float64(KB))
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default:
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return fmt.Sprintf("%d B", bytes)
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}
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}
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// GetStats 获取缓存统计信息
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func (cm *CacheManager) GetStats() CacheStats {
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var totalItems int
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var totalSize int64
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cm.items.Range(func(_, value interface{}) bool {
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item := value.(*CacheItem)
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totalItems++
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totalSize += item.Size
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return true
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})
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hitCount := cm.hitCount.Load()
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missCount := cm.missCount.Load()
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totalRequests := hitCount + missCount
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hitRate := float64(0)
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if totalRequests > 0 {
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hitRate = float64(hitCount) / float64(totalRequests) * 100
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}
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return CacheStats{
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TotalItems: totalItems,
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TotalSize: totalSize,
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HitCount: hitCount,
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MissCount: missCount,
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HitRate: hitRate,
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BytesSaved: cm.bytesSaved.Load(),
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Enabled: cm.enabled.Load(),
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}
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}
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// SetEnabled 设置缓存开关状态
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func (cm *CacheManager) SetEnabled(enabled bool) {
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cm.enabled.Store(enabled)
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}
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// ClearCache 清空缓存
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func (cm *CacheManager) ClearCache() error {
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// 清除内存中的缓存项
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var keysToDelete []CacheKey
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cm.items.Range(func(key, value interface{}) bool {
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cacheKey := key.(CacheKey)
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keysToDelete = append(keysToDelete, cacheKey)
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return true
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})
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for _, key := range keysToDelete {
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cm.items.Delete(key)
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}
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// 清理缓存目录中的所有文件
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entries, err := os.ReadDir(cm.cacheDir)
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if err != nil {
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return fmt.Errorf("failed to read cache directory: %v", err)
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}
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for _, entry := range entries {
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if entry.Name() == "config.json" {
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continue // 保留配置文件
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}
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filePath := filepath.Join(cm.cacheDir, entry.Name())
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if err := os.Remove(filePath); err != nil {
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log.Printf("[Cache] ERR Failed to remove file: %s", entry.Name())
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}
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}
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// 重置统计信息
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cm.hitCount.Store(0)
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cm.missCount.Store(0)
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cm.bytesSaved.Store(0)
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return nil
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}
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// cleanStaleFiles 清理过期和临时文件
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func (cm *CacheManager) cleanStaleFiles() error {
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entries, err := os.ReadDir(cm.cacheDir)
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if err != nil {
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return fmt.Errorf("failed to read cache directory: %v", err)
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}
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for _, entry := range entries {
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if entry.Name() == "config.json" {
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continue // 保留配置文件
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}
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filePath := filepath.Join(cm.cacheDir, entry.Name())
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// 清理临时文件
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if strings.HasPrefix(entry.Name(), "temp-") {
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if err := os.Remove(filePath); err != nil {
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log.Printf("[Cache] ERR Failed to remove temp file: %s", entry.Name())
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}
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continue
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}
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// 检查文件是否仍在缓存记录中
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fileFound := false
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cm.items.Range(func(_, value interface{}) bool {
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item := value.(*CacheItem)
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if item.FilePath == filePath {
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fileFound = true
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return false
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}
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return true
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})
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// 如果文件不在缓存记录中，删除它
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if !fileFound {
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if err := os.Remove(filePath); err != nil {
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log.Printf("[Cache] ERR Failed to remove stale file: %s", entry.Name())
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}
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}
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}
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return nil
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}
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// CreateTemp 创建临时缓存文件
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func (cm *CacheManager) CreateTemp(key CacheKey, resp *http.Response) (*os.File, error) {
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if !cm.enabled.Load() {
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return nil, fmt.Errorf("cache is disabled")
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}
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// 创建临时文件
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tempFile, err := os.CreateTemp(cm.cacheDir, "temp-*")
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if err != nil {
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return nil, fmt.Errorf("failed to create temp file: %v", err)
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}
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return tempFile, nil
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}
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// Commit 提交缓存文件
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func (cm *CacheManager) Commit(key CacheKey, tempPath string, resp *http.Response, size int64) error {
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if !cm.enabled.Load() {
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os.Remove(tempPath)
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return fmt.Errorf("cache is disabled")
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}
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// 生成最终的缓存文件名
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h := sha256.New()
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h.Write([]byte(key.String()))
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hashStr := hex.EncodeToString(h.Sum(nil))
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ext := filepath.Ext(key.URL)
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if ext == "" {
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ext = ".bin"
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}
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filePath := filepath.Join(cm.cacheDir, hashStr+ext)
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// 重命名临时文件
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if err := os.Rename(tempPath, filePath); err != nil {
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os.Remove(tempPath)
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return fmt.Errorf("failed to rename temp file: %v", err)
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}
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// 创建缓存项
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item := &CacheItem{
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FilePath: filePath,
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ContentType: resp.Header.Get("Content-Type"),
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ContentEncoding: resp.Header.Get("Content-Encoding"),
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Size: size,
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LastAccess: time.Now(),
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Hash: hashStr,
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CreatedAt: time.Now(),
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AccessCount: 1,
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}
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cm.items.Store(key, item)
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cm.bytesSaved.Add(size)
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log.Printf("[Cache] NEW %s %s (%s)", resp.Request.Method, key.URL, formatBytes(size))
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return nil
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}
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// GetConfig 获取缓存配置
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func (cm *CacheManager) GetConfig() CacheConfig {
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return CacheConfig{
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MaxAge: int64(cm.maxAge.Minutes()),
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CleanupTick: int64(cm.cleanupTick.Minutes()),
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MaxCacheSize: cm.maxCacheSize / (1024 * 1024 * 1024), // 转换为GB
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}
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}
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// UpdateConfig 更新缓存配置
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func (cm *CacheManager) UpdateConfig(maxAge, cleanupTick, maxCacheSize int64) error {
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if maxAge <= 0 || cleanupTick <= 0 || maxCacheSize <= 0 {
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return fmt.Errorf("invalid config values: all values must be positive")
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}
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cm.maxAge = time.Duration(maxAge) * time.Minute
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cm.maxCacheSize = maxCacheSize * 1024 * 1024 * 1024 // 转换为字节
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// 如果清理间隔发生变化，重启清理协程
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newCleanupTick := time.Duration(cleanupTick) * time.Minute
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if cm.cleanupTick != newCleanupTick {
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cm.cleanupTick = newCleanupTick
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// 停止当前的清理协程
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cm.stopCleanup <- struct{}{}
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// 启动新的清理协程
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cm.startCleanup()
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}
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// 保存配置到文件
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if err := cm.saveConfig(); err != nil {
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log.Printf("[Cache] Failed to save config: %v", err)
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}
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return nil
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}
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// CacheConfig 缓存配置结构
|
||
type CacheConfig struct {
|
||
MaxAge int64 `json:"max_age"` // 最大缓存时间（分钟）
|
||
CleanupTick int64 `json:"cleanup_tick"` // 清理间隔（分钟）
|
||
MaxCacheSize int64 `json:"max_cache_size"` // 最大缓存大小（GB）
|
||
}
|
||
|
||
// startCleanup 启动清理协程
|
||
func (cm *CacheManager) startCleanup() {
|
||
cm.cleanupTimer = time.NewTicker(cm.cleanupTick)
|
||
go func() {
|
||
for {
|
||
select {
|
||
case <-cm.cleanupTimer.C:
|
||
cm.cleanup()
|
||
case <-cm.stopCleanup:
|
||
cm.cleanupTimer.Stop()
|
||
return
|
||
}
|
||
}
|
||
}()
|
||
}
|
||
|
||
// saveConfig 保存配置到文件
|
||
func (cm *CacheManager) saveConfig() error {
|
||
config := CacheConfig{
|
||
MaxAge: int64(cm.maxAge.Minutes()),
|
||
CleanupTick: int64(cm.cleanupTick.Minutes()),
|
||
MaxCacheSize: cm.maxCacheSize / (1024 * 1024 * 1024), // 转换为GB
|
||
}
|
||
|
||
configPath := filepath.Join(cm.cacheDir, "config.json")
|
||
data, err := json.Marshal(config)
|
||
if err != nil {
|
||
return fmt.Errorf("failed to marshal config: %v", err)
|
||
}
|
||
|
||
if err := os.WriteFile(configPath, data, 0600); err != nil {
|
||
return fmt.Errorf("failed to write config file: %v", err)
|
||
}
|
||
|
||
return nil
|
||
}
|
||
|
||
// loadConfig 从文件加载配置
|
||
func (cm *CacheManager) loadConfig() error {
|
||
configPath := filepath.Join(cm.cacheDir, "config.json")
|
||
data, err := os.ReadFile(configPath)
|
||
if err != nil {
|
||
if os.IsNotExist(err) {
|
||
// 如果配置文件不存在，使用默认配置并保存
|
||
return cm.saveConfig()
|
||
}
|
||
return fmt.Errorf("failed to read config file: %v", err)
|
||
}
|
||
|
||
var config CacheConfig
|
||
if err := json.Unmarshal(data, &config); err != nil {
|
||
return fmt.Errorf("failed to unmarshal config: %v", err)
|
||
}
|
||
|
||
// 更新配置
|
||
cm.maxAge = time.Duration(config.MaxAge) * time.Minute
|
||
cm.maxCacheSize = config.MaxCacheSize * 1024 * 1024 * 1024 // 转换为字节
|
||
|
||
// 如果清理间隔发生变化，重启清理协程
|
||
newCleanupTick := time.Duration(config.CleanupTick) * time.Minute
|
||
if cm.cleanupTick != newCleanupTick {
|
||
cm.cleanupTick = newCleanupTick
|
||
if cm.cleanupTimer != nil {
|
||
cm.stopCleanup <- struct{}{}
|
||
}
|
||
cm.startCleanup()
|
||
}
|
||
|
||
return nil
|
||
}
|
||
|
||
// GetExtensionMatcher 获取缓存的ExtensionMatcher
|
||
func (cm *CacheManager) GetExtensionMatcher(pathKey string, rules []config.ExtensionRule) *utils.ExtensionMatcher {
|
||
if cm.extensionMatcherCache == nil {
|
||
return utils.NewExtensionMatcher(rules)
|
||
}
|
||
return cm.extensionMatcherCache.GetOrCreate(pathKey, rules)
|
||
}
|
||
|
||
// InvalidateExtensionMatcherPath 使指定路径的ExtensionMatcher缓存失效
|
||
func (cm *CacheManager) InvalidateExtensionMatcherPath(pathKey string) {
|
||
if cm.extensionMatcherCache != nil {
|
||
cm.extensionMatcherCache.InvalidatePath(pathKey)
|
||
}
|
||
}
|
||
|
||
// InvalidateAllExtensionMatchers 清空所有ExtensionMatcher缓存
|
||
func (cm *CacheManager) InvalidateAllExtensionMatchers() {
|
||
if cm.extensionMatcherCache != nil {
|
||
cm.extensionMatcherCache.InvalidateAll()
|
||
}
|
||
}
|
||
|
||
// GetExtensionMatcherStats 获取ExtensionMatcher缓存统计信息
|
||
func (cm *CacheManager) GetExtensionMatcherStats() ExtensionMatcherCacheStats {
|
||
if cm.extensionMatcherCache != nil {
|
||
return cm.extensionMatcherCache.GetStats()
|
||
}
|
||
return ExtensionMatcherCacheStats{}
|
||
}
|
||
|
||
// UpdateExtensionMatcherConfig 更新ExtensionMatcher缓存配置
|
||
func (cm *CacheManager) UpdateExtensionMatcherConfig(maxAge, cleanupTick time.Duration) {
|
||
if cm.extensionMatcherCache != nil {
|
||
cm.extensionMatcherCache.UpdateConfig(maxAge, cleanupTick)
|
||
}
|
||
}
|
||
|
||
// Stop 停止缓存管理器（包括ExtensionMatcher缓存）
|
||
func (cm *CacheManager) Stop() {
|
||
// 停止主缓存清理
|
||
if cm.cleanupTimer != nil {
|
||
cm.cleanupTimer.Stop()
|
||
}
|
||
close(cm.stopCleanup)
|
||
|
||
// 停止ExtensionMatcher缓存
|
||
if cm.extensionMatcherCache != nil {
|
||
cm.extensionMatcherCache.Stop()
|
||
}
|
||
}
|