func GetRunnableSlotList() ([]*pb.Command,error) {
	//connecting
	conn, err := grpc.Dial(address, grpc.WithInsecure())
	if err != nil {
		log.Printf("Connection error:%v", err)
		logger.Printf("Connection error:%v", err)
		return nil,err
	}
	defer conn.Close()
	c := pb.NewBoxServiceClient(conn)

	res,err:=c.GetRunnableSlotList(context.Background(),&empty.Empty{})
	if err!=nil{
		log.Printf("getRunnableSlotList grpc error:%v",err)
		logger.Printf("getRunnableSlotList grpc error:%v",err)
	}
	return res.Command,nil

}

func GetRunnableDaemonList() ([]*pb.Command,error) {
	//connecting
	conn, err := grpc.Dial(address, grpc.WithInsecure())
	if err != nil {
		log.Printf("Connection error:%v", err)
		logger.Printf("Connection error:%v", err)
		return nil,err
	}
	defer conn.Close()
	c := pb.NewBoxServiceClient(conn)

	res,err:=c.GetRunnableDaemonList(context.Background(),&empty.Empty{})
	if err!=nil{
		log.Printf("getRunnableDaemonList grpc error:%v",err)
		logger.Printf("getRunnableDaemonList grpc error:%v",err)
	}
	return res.Command,nil
}


func GetList(tag string)([]*pb.Command,error)  {
	//for testing
	address=os.Getenv("grpc_server")
	//connecting
	conn, err := grpc.Dial(address, grpc.WithInsecure())
	if err != nil {
		log.Printf("Connection error:%v", err)
		logger.Printf("Connection error:%v", err)
		return nil,err
	}
	defer conn.Close()
	c := pb.NewBoxServiceClient(conn)


	switch tag {
	case "runnableSlot":
		res,err:=c.GetRunnableSlotList(context.Background(),&empty.Empty{})
		if err!=nil{
			log.Printf("getRunnableSlotList grpc error:%v",err)
			logger.Printf("getRunnableSlotList grpc error:%v",err)
		}
		return res.Command,nil
	case "runnableDaemon":
		res,err:=c.GetRunnableDaemonList(context.Background(),&empty.Empty{})
		if err!=nil{
			log.Printf("getRunnableDaemonList grpc error:%v",err)
			logger.Printf("getRunnableDaemonList grpc error:%v",err)
		}
		return res.Command,nil
	case "terminatedDaemon":
		res,err:=c.GetTerminatedDaemonList(context.Background(),&empty.Empty{})
		if err!=nil{
			log.Printf("getTerminatedDaemonList grpc error:%v",err)
			logger.Printf("getTerminatedDaemonList grpc error:%v",err)
		}
		return res.Command,nil
	}
	return nil, errors.New("no such a tag")

}