code: def check_connection(self):
      resp = self.stub.CheckConnection(self.context)
      logger.info(
          "%s.check_connection: returns success - %s, error - %s",
          self.__class__.__name__,
          resp.success,
          resp.error_message,
      )
  
      return self._to_status_response(resp)
  
imports: import os
  import pickle
  import json
  import grpc
  from mindsdb.microservices_grpc.db import db_pb2_grpc
  from mindsdb.microservices_grpc.db import db_pb2, common_pb2
  from mindsdb.integrations.libs.response import HandlerStatusResponse, HandlerResponse
  from mindsdb.integrations.libs.handler_helpers import action_logger
  from mindsdb.utilities.context import context
  from mindsdb.utilities import log
label_desc: Use image node_id 7 for calling the DBClientGRPC obj's underlying member method code with example usage: obj.check_connection() and returns: self