276 lines
8.1 KiB
Go
276 lines
8.1 KiB
Go
package service
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import (
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"context"
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"crypto/sha256"
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"encoding/hex"
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"errors"
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"fmt"
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"math/rand"
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"sync"
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"time"
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"github.com/Wei-Shaw/sub2api/internal/config"
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"github.com/dgraph-io/ristretto"
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)
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type apiKeyAuthCacheConfig struct {
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l1Size int
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l1TTL time.Duration
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l2TTL time.Duration
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negativeTTL time.Duration
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jitterPercent int
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singleflight bool
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}
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var (
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jitterRandMu sync.Mutex
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// 认证缓存抖动使用独立随机源，避免全局 Seed
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jitterRand = rand.New(rand.NewSource(time.Now().UnixNano()))
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)
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func newAPIKeyAuthCacheConfig(cfg *config.Config) apiKeyAuthCacheConfig {
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if cfg == nil {
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return apiKeyAuthCacheConfig{}
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}
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auth := cfg.APIKeyAuth
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return apiKeyAuthCacheConfig{
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l1Size: auth.L1Size,
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l1TTL: time.Duration(auth.L1TTLSeconds) * time.Second,
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l2TTL: time.Duration(auth.L2TTLSeconds) * time.Second,
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negativeTTL: time.Duration(auth.NegativeTTLSeconds) * time.Second,
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jitterPercent: auth.JitterPercent,
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singleflight: auth.Singleflight,
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}
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}
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func (c apiKeyAuthCacheConfig) l1Enabled() bool {
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return c.l1Size > 0 && c.l1TTL > 0
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}
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func (c apiKeyAuthCacheConfig) l2Enabled() bool {
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return c.l2TTL > 0
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}
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func (c apiKeyAuthCacheConfig) negativeEnabled() bool {
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return c.negativeTTL > 0
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}
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func (c apiKeyAuthCacheConfig) jitterTTL(ttl time.Duration) time.Duration {
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if ttl <= 0 {
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return ttl
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}
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if c.jitterPercent <= 0 {
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return ttl
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}
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percent := c.jitterPercent
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if percent > 100 {
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percent = 100
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}
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delta := float64(percent) / 100
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jitterRandMu.Lock()
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randVal := jitterRand.Float64()
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jitterRandMu.Unlock()
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factor := 1 - delta + randVal*(2*delta)
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if factor <= 0 {
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return ttl
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}
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return time.Duration(float64(ttl) * factor)
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}
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func (s *APIKeyService) initAuthCache(cfg *config.Config) {
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s.authCfg = newAPIKeyAuthCacheConfig(cfg)
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if !s.authCfg.l1Enabled() {
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return
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}
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cache, err := ristretto.NewCache(&ristretto.Config{
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NumCounters: int64(s.authCfg.l1Size) * 10,
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MaxCost: int64(s.authCfg.l1Size),
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BufferItems: 64,
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})
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if err != nil {
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return
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}
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s.authCacheL1 = cache
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}
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func (s *APIKeyService) authCacheKey(key string) string {
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sum := sha256.Sum256([]byte(key))
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return hex.EncodeToString(sum[:])
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}
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func (s *APIKeyService) getAuthCacheEntry(ctx context.Context, cacheKey string) (*APIKeyAuthCacheEntry, bool) {
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if s.authCacheL1 != nil {
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if val, ok := s.authCacheL1.Get(cacheKey); ok {
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if entry, ok := val.(*APIKeyAuthCacheEntry); ok {
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return entry, true
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}
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}
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}
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if s.cache == nil || !s.authCfg.l2Enabled() {
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return nil, false
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}
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entry, err := s.cache.GetAuthCache(ctx, cacheKey)
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if err != nil {
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return nil, false
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}
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s.setAuthCacheL1(cacheKey, entry)
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return entry, true
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}
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func (s *APIKeyService) setAuthCacheL1(cacheKey string, entry *APIKeyAuthCacheEntry) {
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if s.authCacheL1 == nil || entry == nil {
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return
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}
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ttl := s.authCfg.l1TTL
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if entry.NotFound && s.authCfg.negativeTTL > 0 && s.authCfg.negativeTTL < ttl {
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ttl = s.authCfg.negativeTTL
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}
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ttl = s.authCfg.jitterTTL(ttl)
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_ = s.authCacheL1.SetWithTTL(cacheKey, entry, 1, ttl)
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}
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func (s *APIKeyService) setAuthCacheEntry(ctx context.Context, cacheKey string, entry *APIKeyAuthCacheEntry, ttl time.Duration) {
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if entry == nil {
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return
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}
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s.setAuthCacheL1(cacheKey, entry)
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if s.cache == nil || !s.authCfg.l2Enabled() {
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return
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}
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_ = s.cache.SetAuthCache(ctx, cacheKey, entry, s.authCfg.jitterTTL(ttl))
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}
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func (s *APIKeyService) deleteAuthCache(ctx context.Context, cacheKey string) {
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if s.authCacheL1 != nil {
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s.authCacheL1.Del(cacheKey)
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}
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if s.cache == nil {
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return
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}
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_ = s.cache.DeleteAuthCache(ctx, cacheKey)
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}
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func (s *APIKeyService) loadAuthCacheEntry(ctx context.Context, key, cacheKey string) (*APIKeyAuthCacheEntry, error) {
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apiKey, err := s.apiKeyRepo.GetByKeyForAuth(ctx, key)
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if err != nil {
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if errors.Is(err, ErrAPIKeyNotFound) {
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entry := &APIKeyAuthCacheEntry{NotFound: true}
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if s.authCfg.negativeEnabled() {
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s.setAuthCacheEntry(ctx, cacheKey, entry, s.authCfg.negativeTTL)
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}
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return entry, nil
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}
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return nil, fmt.Errorf("get api key: %w", err)
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}
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apiKey.Key = key
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snapshot := s.snapshotFromAPIKey(apiKey)
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if snapshot == nil {
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return nil, fmt.Errorf("get api key: %w", ErrAPIKeyNotFound)
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}
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entry := &APIKeyAuthCacheEntry{Snapshot: snapshot}
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s.setAuthCacheEntry(ctx, cacheKey, entry, s.authCfg.l2TTL)
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return entry, nil
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}
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func (s *APIKeyService) applyAuthCacheEntry(key string, entry *APIKeyAuthCacheEntry) (*APIKey, bool, error) {
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if entry == nil {
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return nil, false, nil
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}
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if entry.NotFound {
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return nil, true, ErrAPIKeyNotFound
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}
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if entry.Snapshot == nil {
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return nil, false, nil
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}
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return s.snapshotToAPIKey(key, entry.Snapshot), true, nil
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}
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func (s *APIKeyService) snapshotFromAPIKey(apiKey *APIKey) *APIKeyAuthSnapshot {
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if apiKey == nil || apiKey.User == nil {
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return nil
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}
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snapshot := &APIKeyAuthSnapshot{
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APIKeyID: apiKey.ID,
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UserID: apiKey.UserID,
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GroupID: apiKey.GroupID,
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Status: apiKey.Status,
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IPWhitelist: apiKey.IPWhitelist,
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IPBlacklist: apiKey.IPBlacklist,
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User: APIKeyAuthUserSnapshot{
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ID: apiKey.User.ID,
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Status: apiKey.User.Status,
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Role: apiKey.User.Role,
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Balance: apiKey.User.Balance,
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Concurrency: apiKey.User.Concurrency,
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},
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}
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if apiKey.Group != nil {
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snapshot.Group = &APIKeyAuthGroupSnapshot{
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ID: apiKey.Group.ID,
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Name: apiKey.Group.Name,
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Platform: apiKey.Group.Platform,
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Status: apiKey.Group.Status,
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SubscriptionType: apiKey.Group.SubscriptionType,
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RateMultiplier: apiKey.Group.RateMultiplier,
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DailyLimitUSD: apiKey.Group.DailyLimitUSD,
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WeeklyLimitUSD: apiKey.Group.WeeklyLimitUSD,
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MonthlyLimitUSD: apiKey.Group.MonthlyLimitUSD,
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ImagePrice1K: apiKey.Group.ImagePrice1K,
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ImagePrice2K: apiKey.Group.ImagePrice2K,
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ImagePrice4K: apiKey.Group.ImagePrice4K,
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ClaudeCodeOnly: apiKey.Group.ClaudeCodeOnly,
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FallbackGroupID: apiKey.Group.FallbackGroupID,
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FallbackGroupIDOnInvalidRequest: apiKey.Group.FallbackGroupIDOnInvalidRequest,
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ModelRouting: apiKey.Group.ModelRouting,
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ModelRoutingEnabled: apiKey.Group.ModelRoutingEnabled,
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}
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}
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return snapshot
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}
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func (s *APIKeyService) snapshotToAPIKey(key string, snapshot *APIKeyAuthSnapshot) *APIKey {
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if snapshot == nil {
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return nil
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}
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apiKey := &APIKey{
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ID: snapshot.APIKeyID,
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UserID: snapshot.UserID,
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GroupID: snapshot.GroupID,
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Key: key,
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Status: snapshot.Status,
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IPWhitelist: snapshot.IPWhitelist,
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IPBlacklist: snapshot.IPBlacklist,
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User: &User{
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ID: snapshot.User.ID,
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Status: snapshot.User.Status,
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Role: snapshot.User.Role,
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Balance: snapshot.User.Balance,
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Concurrency: snapshot.User.Concurrency,
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},
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}
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if snapshot.Group != nil {
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apiKey.Group = &Group{
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ID: snapshot.Group.ID,
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Name: snapshot.Group.Name,
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Platform: snapshot.Group.Platform,
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Status: snapshot.Group.Status,
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Hydrated: true,
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SubscriptionType: snapshot.Group.SubscriptionType,
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RateMultiplier: snapshot.Group.RateMultiplier,
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DailyLimitUSD: snapshot.Group.DailyLimitUSD,
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WeeklyLimitUSD: snapshot.Group.WeeklyLimitUSD,
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MonthlyLimitUSD: snapshot.Group.MonthlyLimitUSD,
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ImagePrice1K: snapshot.Group.ImagePrice1K,
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ImagePrice2K: snapshot.Group.ImagePrice2K,
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ImagePrice4K: snapshot.Group.ImagePrice4K,
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ClaudeCodeOnly: snapshot.Group.ClaudeCodeOnly,
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FallbackGroupID: snapshot.Group.FallbackGroupID,
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FallbackGroupIDOnInvalidRequest: snapshot.Group.FallbackGroupIDOnInvalidRequest,
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ModelRouting: snapshot.Group.ModelRouting,
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ModelRoutingEnabled: snapshot.Group.ModelRoutingEnabled,
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}
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}
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return apiKey
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}
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