fix: [2.4] RuntimeWarning: coroutine 'Channel.close' was never awaited when closing async client (#2498)

Signed-off-by: Ruichen Bao <ruichen.bao@zju.edu.cn>

Author: brcarry

pymilvus/client/async_grpc_handler.py

@@ -108,9 +108,9 @@ def __enter__(self):
     def __exit__(self: object, exc_type: object, exc_val: object, exc_tb: object):
         pass
 
-    def close(self):
+    async def close(self):
         self.deregister_state_change_callbacks()
-        self._async_channel.close()
+        await self._async_channel.close()
 
     def _setup_authorization_interceptor(self, user: str, password: str, token: str):
         keys = []

pymilvus/milvus_client/async_milvus_client.py

@@ -516,8 +516,8 @@ def create_schema(cls, **kwargs):
         kwargs["check_fields"] = False  # do not check fields for now
         return CollectionSchema([], **kwargs)
 
-    def close(self):
-        connections.disconnect(self._using)
+    async def close(self):
+        await connections.async_disconnect(self._using)
 
     def _get_connection(self):
         return connections._fetch_handler(self._using)

pymilvus/orm/connections.py

@@ -285,6 +285,13 @@ def disconnect(self, alias: str):
         if alias in self._connected_alias:
             self._connected_alias.pop(alias).close()
 
+    async def async_disconnect(self, alias: str):
+        if not isinstance(alias, str):
+            raise ConnectionConfigException(message=ExceptionsMessage.AliasType % type(alias))
+
+        if alias in self._connected_alias:
+            await self._connected_alias.pop(alias).close()
+
     def remove_connection(self, alias: str):
         """Removes connection from the registry.