async def close_async(self):
        """Close async connection.
        """
        if self._async_wait:
            await self._async_wait
        if self._async_conn:
            conn = self._async_conn
            self._async_conn = None
            self._async_wait = None
            self._task_data = None
            await conn.close()
async def close_async ( self ) : if self . _async_wait : await self . _async_wait if self . _async_conn : conn = self . _async_conn self . _async_conn = None self . _async_wait = None self . _task_data = None await conn . close ( )
Close async connection.