func main()

in example/etcd_client/etcd_client.go [30:122]
72 lines of code
17 McCabe index (conditional complexity)

func main() {
	ecp := &etcd_client.EtcdClientParam{
		EtcdServers: []string{"http://127.0.0.1:2379"}, //require user provide
		TTL:         50,
	}

	sdkClient := shenyu_sdk_client.GetFactoryClient(constants.ETCD_CLIENT)
	client, createResult, err := sdkClient.NewClient(ecp)
	if !createResult && err != nil {
		fmt.Printf("Create ShenYuEtcdClient error : %v", err)
	}

	etcd := client.(*etcd_client.ShenYuEtcdClient)
	defer etcd.Close()

	//init MetaDataRegister
	metaData1 := &model.MetaDataRegister{
		AppName:      "testMetaDataRegister1",                //require user provide
		Path:         "your/path1",                           //require user provide
		Enabled:      true,                                   //require user provide
		Host:         "127.0.0.1",                            //require user provide
		Port:         "8080",                                 //require user provide
		NamespaceIds: "649330b6-c2d7-4edc-be8e-8a54df9eb385", //require user provide
	}

	metaData2 := &model.MetaDataRegister{
		AppName:      "testMetaDataRegister2",                //require user provide
		Path:         "your/path2",                           //require user provide
		Enabled:      true,                                   //require user provide
		Host:         "127.0.0.1",                            //require user provide
		Port:         "8181",                                 //require user provide
		NamespaceIds: "649330b6-c2d7-4edc-be8e-8a54df9eb385", //require user provide
	}

	//register multiple metaData
	registerResult1, err := etcd.RegisterServiceInstance(metaData1)
	if !registerResult1 && err != nil {
		fmt.Printf("Register etcd Instance error : %v", err)
	}

	registerResult2, err := etcd.RegisterServiceInstance(metaData2)
	if !registerResult2 && err != nil {
		fmt.Printf("Register etcd Instance error : %v", err)
	}

	time.Sleep(time.Second)

	instanceDetail, err := etcd.GetServiceInstanceInfo(metaData1)
	nodes1, ok := instanceDetail.([]*model.MetaDataRegister)
	if !ok {
		fmt.Printf("get etcd client metaData error %v:", err)
	}

	//range nodes
	for index, node := range nodes1 {
		nodeJson, err := json.Marshal(node)
		if err == nil {
			fmt.Printf("GetNodesInfo ,success Index %v ,%v", index, string(nodeJson))
		}
	}

	instanceDetail2, err := etcd.GetServiceInstanceInfo(metaData2)
	nodes2, ok := instanceDetail2.([]*model.MetaDataRegister)
	if !ok {
		fmt.Printf("get etcd client metaData error %v:", err)
	}

	//range nodes
	for index, node := range nodes2 {
		nodeJson, err := json.Marshal(node)
		if err == nil {
			fmt.Printf("GetNodesInfo ,success Index %v ,%v", index, string(nodeJson))
		}
	}

	fmt.Printf("> DeregisterServiceInstance start")
	deRegisterResult1, err := etcd.DeregisterServiceInstance(metaData1)
	if err != nil {
		panic(err)
	}

	deRegisterResult2, err := etcd.DeregisterServiceInstance(metaData2)
	if err != nil {
		panic(err)
	}

	if deRegisterResult1 && deRegisterResult2 {
		fmt.Printf("DeregisterServiceInstance success !")
	}
	//DeregisterServiceInstance end

	//do your logic
}