fix: add Redis initialization and error handling in main server logic

cmd/server/main.go

@@ -3208,3 +3208,88 @@ func verifyAndRepairThumbnails(thumbnailPaths []string, redisClient *redis.Clien
 		}
 	}
 }
+
+func initializeRedis(cfg RedisConfig) error {
+	if !cfg.RedisEnabled {
+		log.Info("Redis is disabled in the configuration.")
+		return nil
+	}
+
+	redisClient = redis.NewClient(&redis.Options{
+		Addr:         cfg.RedisAddr,
+		Password:     cfg.RedisPassword,
+		DB:           cfg.RedisDBIndex,
+		PoolSize:     10,
+		MinIdleConns: 3,
+		MaxRetries:   3,
+	})
+
+	// Test the connection
+	ctx, cancel := context.WithTimeout(context.Background(), 5*time.Second)
+	defer cancel()
+
+	_, err := redisClient.Ping(ctx).Result()
+	if err != nil {
+		log.Errorf("Failed to connect to Redis at %s: %v", cfg.RedisAddr, err)
+		return err
+	}
+
+	log.Info("Successfully connected to Redis.")
+	return nil
+}
+
+func main() {
+	// ...existing setup code...
+
+	// Initialize Redis
+	err := initializeRedis(conf.Redis)
+	if err != nil {
+		log.Fatalf("Redis initialization failed: %v", err)
+	}
+
+	// ...rest of the server setup...
+}
+
+// ...existing code...
+
+func verifyAndRepairThumbnails(thumbnailPaths []string, redisClient *redis.Client, originalDir string) {
+	if conf.Redis.RedisEnabled && redisClient == nil {
+		log.Error("Redis client is nil. Cannot verify and repair thumbnails.")
+		return
+	}
+
+	// ...existing logic to verify and repair thumbnails...
+
+	for _, thumbPath := range thumbnailPaths {
+		file, err := os.Open(thumbPath)
+		if err != nil {
+			log.Warnf("Error opening regenerated thumbnail %s: %v", thumbPath, err)
+			continue
+		}
+		defer file.Close()
+
+		h := sha256.New()
+		h.Reset()
+		if _, err := io.Copy(h, file); err != nil {
+			log.Warnf("Error hashing regenerated thumbnail %s: %v", thumbPath, err)
+			continue
+		}
+
+		newHash := hex.EncodeToString(h.Sum(nil))
+
+		// Store new hash in Redis if enabled
+		if conf.Redis.RedisEnabled && redisClient != nil {
+			err = redisClient.Set(context.Background(), thumbPath, newHash, 0).Err()
+			if err != nil {
+				log.Warnf("Error storing new hash for thumbnail %s in Redis: %v", thumbPath, err)
+				continue
+			}
+		} else {
+			log.Warnf("Redis is disabled or client is nil. Skipping storing hash for thumbnail %s", thumbPath)
+		}
+
+		log.Infof("Successfully regenerated and updated thumbnail %s", thumbPath)
+	}
+}
+
+// ...existing code...