Feat: graceful shutdown

pkg/cache/impl.go

@@ -102,6 +102,19 @@ func (mc *MemoryCache) RemoveKey(key string) {
 	mc.lock.RUnlock()
 }
 
+func (mc *MemoryCache) BackupNow() {
+	data := mc.GetAll()
+	jsonString, err := json.Marshal(data)
+	if err != nil {
+		slog.Warn("immediate backup failed to marshal", "err", err)
+		return
+	}
+	err = os.WriteFile(storeFileName, jsonString, os.ModePerm)
+	if err != nil {
+		slog.Warn("immediate backup failed to write", "err", err)
+	}
+}
+
 func (mc *MemoryCache) StartExpiryRoutine(n time.Duration) {
 	ticker := time.NewTicker(n)
 	go func() {
@@ -127,18 +140,7 @@ func (mc *MemoryCache) StartBackupRoutine(n time.Duration) {
 	go func() {
 		for {
 			<-ticker.C
-			// get all
-			data := mc.GetAll()
-			jsonString, err := json.Marshal(data)
-			if err != nil {
-				slog.Warn("failed to marshal", "err", err)
-				continue
-			}
-			err = os.WriteFile(storeFileName, jsonString, os.ModePerm)
-			if err != nil {
-				slog.Warn("failed to write", "err", err)
-				continue
-			}
+			mc.BackupNow()
 		}
 	}()
 }