169 lines
3.9 KiB
Go
169 lines
3.9 KiB
Go
package main
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import (
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"crypto/md5"
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"encoding/json"
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"fmt"
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"strings"
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"sync"
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"time"
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"github.com/gin-gonic/gin"
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)
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// CachedItem 通用缓存项，支持Token和Manifest
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type CachedItem struct {
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Data []byte // 缓存数据(token字符串或manifest字节)
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ContentType string // 内容类型
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Headers map[string]string // 额外的响应头
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ExpiresAt time.Time // 过期时间
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}
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// UniversalCache 通用缓存，支持Token和Manifest
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type UniversalCache struct {
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cache sync.Map
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}
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var globalCache = &UniversalCache{}
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// Get 获取缓存项
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func (c *UniversalCache) Get(key string) *CachedItem {
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if v, ok := c.cache.Load(key); ok {
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if cached := v.(*CachedItem); time.Now().Before(cached.ExpiresAt) {
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return cached
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}
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c.cache.Delete(key)
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}
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return nil
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}
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func (c *UniversalCache) Set(key string, data []byte, contentType string, headers map[string]string, ttl time.Duration) {
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c.cache.Store(key, &CachedItem{
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Data: data,
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ContentType: contentType,
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Headers: headers,
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ExpiresAt: time.Now().Add(ttl),
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})
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}
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func (c *UniversalCache) GetToken(key string) string {
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if item := c.Get(key); item != nil {
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return string(item.Data)
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}
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return ""
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}
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func (c *UniversalCache) SetToken(key, token string, ttl time.Duration) {
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c.Set(key, []byte(token), "application/json", nil, ttl)
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}
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// buildCacheKey 构建稳定的缓存key
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func buildCacheKey(prefix, query string) string {
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return fmt.Sprintf("%s:%x", prefix, md5.Sum([]byte(query)))
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}
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func buildTokenCacheKey(query string) string {
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return buildCacheKey("token", query)
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}
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func buildManifestCacheKey(imageRef, reference string) string {
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key := fmt.Sprintf("%s:%s", imageRef, reference)
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return buildCacheKey("manifest", key)
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}
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func getManifestTTL(reference string) time.Duration {
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cfg := GetConfig()
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defaultTTL := 30 * time.Minute
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if cfg.TokenCache.DefaultTTL != "" {
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if parsed, err := time.ParseDuration(cfg.TokenCache.DefaultTTL); err == nil {
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defaultTTL = parsed
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}
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}
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if strings.HasPrefix(reference, "sha256:") {
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return 24 * time.Hour
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}
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// mutable tag的智能判断
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if reference == "latest" || reference == "main" || reference == "master" ||
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reference == "dev" || reference == "develop" {
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// 热门可变标签: 短期缓存
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return 10 * time.Minute
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}
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return defaultTTL
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}
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// extractTTLFromResponse 从响应中智能提取TTL
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func extractTTLFromResponse(responseBody []byte) time.Duration {
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var tokenResp struct {
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ExpiresIn int `json:"expires_in"`
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}
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// 默认30分钟TTL，确保稳定性
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defaultTTL := 30 * time.Minute
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if json.Unmarshal(responseBody, &tokenResp) == nil && tokenResp.ExpiresIn > 0 {
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safeTTL := time.Duration(tokenResp.ExpiresIn-300) * time.Second
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if safeTTL > 5*time.Minute {
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return safeTTL
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}
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}
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return defaultTTL
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}
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func writeTokenResponse(c *gin.Context, cachedBody string) {
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c.Header("Content-Type", "application/json")
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c.String(200, cachedBody)
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}
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func writeCachedResponse(c *gin.Context, item *CachedItem) {
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if item.ContentType != "" {
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c.Header("Content-Type", item.ContentType)
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}
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// 设置额外的响应头
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for key, value := range item.Headers {
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c.Header(key, value)
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}
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// 返回数据
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c.Data(200, item.ContentType, item.Data)
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}
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// isCacheEnabled 检查缓存是否启用
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func isCacheEnabled() bool {
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cfg := GetConfig()
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return cfg.TokenCache.Enabled
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}
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// isTokenCacheEnabled 检查token缓存是否启用(向后兼容)
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func isTokenCacheEnabled() bool {
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return isCacheEnabled()
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}
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// 定期清理过期缓存，防止内存泄漏
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func init() {
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go func() {
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ticker := time.NewTicker(20 * time.Minute)
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defer ticker.Stop()
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for range ticker.C {
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now := time.Now()
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expiredKeys := make([]string, 0)
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globalCache.cache.Range(func(key, value interface{}) bool {
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if cached := value.(*CachedItem); now.After(cached.ExpiresAt) {
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expiredKeys = append(expiredKeys, key.(string))
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}
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return true
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})
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for _, key := range expiredKeys {
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globalCache.cache.Delete(key)
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}
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}
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}()
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}
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