未知yaml中gvk时候client go创建资源

package main

import (
    "context"
    "io/ioutil"

    "k8s.io/client-go/rest"

    "k8s.io/apimachinery/pkg/api/meta"
    metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
    "k8s.io/apimachinery/pkg/apis/meta/v1/unstructured"
    "k8s.io/apimachinery/pkg/runtime"
    yamlCodec "k8s.io/apimachinery/pkg/runtime/serializer/yaml"
    "k8s.io/client-go/discovery"
    memory "k8s.io/client-go/discovery/cached"
    "k8s.io/client-go/dynamic"
    "k8s.io/client-go/restmapper"
)

func dynamicCreate(ctx context.Context, cfg *rest.Config, codec runtime.Serializer, data []byte) error {
    discoveryClient, err := discovery.NewDiscoveryClientForConfig(cfg)
    if err != nil {
        return err
    }

    mapper := restmapper.NewDeferredDiscoveryRESTMapper(memory.NewMemCacheClient(discoveryClient))
    dynamicClient, err := dynamic.NewForConfig(cfg)
    if err != nil {
        return err
    }

    obj := &unstructured.Unstructured{}
    _, gvk, err := codec.Decode(data, nil, obj)
    if err != nil {
        return err
    }

    mapping, err := mapper.RESTMapping(gvk.GroupKind(), gvk.Version)
    if err != nil {
        return err
    }

    var dynamicResource dynamic.ResourceInterface = dynamicClient.Resource(mapping.Resource)
    if mapping.Scope.Name() == meta.RESTScopeNameNamespace {
        namesapce := obj.GetNamespace()
        if namesapce == "" {
            namesapce = "default"
        }
        dynamicResource = dynamicClient.Resource(mapping.Resource).Namespace(namesapce)
    }

    if _, err := dynamicResource.Create(ctx, obj, metav1.CreateOptions{}); err != nil {
        return err
    }

    return nil
}

func main() {
    data, err := ioutil.ReadFile("./demo.yaml")
    if err != nil {
        panic(err)
    }
    restConfig := &rest.Config{
        Host:        "yourk8shost",
        BearerToken: "yourtoken",
        TLSClientConfig: rest.TLSClientConfig{
            Insecure: true,
        },
    }
    ctx := context.TODO()
    codec := yamlCodec.NewDecodingSerializer(unstructured.UnstructuredJSONScheme)
    if err := dynamicCreate(ctx, restConfig, codec, data); err != nil {
        panic(err)
    }
}