feat: Add support for custom Redis Cluster users

This introduces the ability to specify a custom username for authenticating with Redis Clusters.

api/configs/middleware/cache/redis_config.py

@@ -84,6 +84,11 @@ class RedisConfig(BaseSettings):
         default=None,
     )
 
+    REDIS_CLUSTERS_USERNAME: Optional[str] = Field(
+        description="Username for Redis Clusters authentication (Required if a custom username is used)",
+        default=None,
+    )
+
     REDIS_SERIALIZATION_PROTOCOL: int = Field(
         description="Redis serialization protocol (RESP) version",
         default=3,

api/extensions/ext_redis.py

@@ -96,6 +96,7 @@ def init_app(app: DifyApp):
         redis_client.initialize(
             RedisCluster(
                 startup_nodes=nodes,
+                username=dify_config.REDIS_CLUSTERS_USERNAME,
                 password=dify_config.REDIS_CLUSTERS_PASSWORD,
                 protocol=resp_protocol,
                 cache_config=clientside_cache_config,