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soul-api/internal/cache/memory.go

@@ -0,0 +1,52 @@
+package cache
+
+import (
+	"strings"
+	"sync"
+	"time"
+)
+
+// memoryFallback Redis 不可用时的内存备用缓存，保证服务可用
+var (
+	memoryMu   sync.RWMutex
+	memoryData = make(map[string]*memoryEntry)
+)
+
+type memoryEntry struct {
+	Data   []byte
+	Expiry time.Time
+}
+
+func memoryGet(key string) ([]byte, bool) {
+	memoryMu.RLock()
+	defer memoryMu.RUnlock()
+	e, ok := memoryData[key]
+	if !ok || e == nil || time.Now().After(e.Expiry) {
+		return nil, false
+	}
+	return e.Data, true
+}
+
+func memorySet(key string, data []byte, ttl time.Duration) {
+	memoryMu.Lock()
+	defer memoryMu.Unlock()
+	memoryData[key] = &memoryEntry{Data: data, Expiry: time.Now().Add(ttl)}
+}
+
+func memoryDel(key string) {
+	memoryMu.Lock()
+	defer memoryMu.Unlock()
+	delete(memoryData, key)
+}
+
+// memoryDelPattern 按前缀删除（pattern 如 soul:book:chapters-by-part:* 转为前缀 soul:book:chapters-by-part:）
+func memoryDelPattern(pattern string) {
+	prefix := strings.TrimSuffix(pattern, "*")
+	memoryMu.Lock()
+	defer memoryMu.Unlock()
+	for k := range memoryData {
+		if strings.HasPrefix(k, prefix) {
+			delete(memoryData, k)
+		}
+	}
+}