apiserver: fix covert connect methods to kube verbs

pkg/apiserver/registry/clusterpedia/resources/rest.go

@@ -30,7 +30,7 @@ var _ genericrest.SingularNameProvider = &REST{}
 // NewREST returns a RESTStorage object that will work against API services
 func NewREST(resourceHandler http.Handler, methods []string) *REST {
 	if len(methods) == 0 {
-		methods = []string{"Get"}
+		methods = []string{"GET"}
 	}
 	return &REST{
 		methods: methods,

pkg/kubeapiserver/apiserver.go

@@ -143,16 +143,18 @@ func (c completedConfig) New(delegationTarget genericapiserver.DelegationTarget)
 
 	controller := NewClusterResourceController(restManager, discoveryManager, c.ExtraConfig.InformerFactory.Cluster().V1alpha2().PediaClusters())
 
-	methodSet := sets.Set[string]{}
+	methodSet := sets.New("GET")
 	for _, rest := range proxyrest.GetSubresourceRESTs(controller) {
-		restManager.preRegisterSubresource(subresource{
+		if err := restManager.preRegisterSubresource(subresource{
 			gr:         rest.ParentGroupResource(),
 			kind:       rest.ParentKind(),
 			namespaced: rest.Namespaced(),
 
 			name:      rest.Subresource(),
 			connecter: rest,
-		})
+		}); err != nil {
+			return nil, nil, err
+		}
 		methodSet.Insert(rest.ConnectMethods()...)
 	}
 

pkg/kubeapiserver/resourcerest/proxy/subresource.go

@@ -60,7 +60,7 @@ func GetSubresourceRESTs(connGetter ClusterConnectionGetter) []*PodSubresourceRe
 			parent:          schema.GroupResource{Group: "", Resource: "pods"},
 			parentKind:      "Pod",
 			namespaced:      true,
-			methods:         []string{"GET"},
+			methods:         []string{"GET", "POST", "PUT", "PATCH", "DELETE", "HEAD", "OPTIONS"},
 			upgradeRequired: false,
 			options:         &api.PodProxyOptions{},
 			connGetter:      connGetter,

pkg/kubeapiserver/restmanager.go

@@ -1,6 +1,7 @@
 package kubeapiserver
 
 import (
+	"fmt"
 	"strings"
 	"sync"
 	"sync/atomic"
@@ -34,6 +35,21 @@ import (
 	"github.com/clusterpedia-io/clusterpedia/pkg/storage"
 )
 
+// toDiscoveryKubeVerb maps an action.Verb to the logical kube verb, used for discovery
+var toDiscoveryKubeVerb = map[string]string{
+	"CONNECT":          "", // do not list in discovery.
+	"DELETE":           "delete",
+	"DELETECOLLECTION": "deletecollection",
+	"GET":              "get",
+	"LIST":             "list",
+	"PATCH":            "patch",
+	"POST":             "create",
+	"PROXY":            "proxy",
+	"PUT":              "update",
+	"WATCH":            "watch",
+	"WATCHLIST":        "watch",
+}
+
 type RESTManager struct {
 	serializer                 runtime.NegotiatedSerializer
 	storageFactory             storage.StorageFactory
@@ -116,12 +132,22 @@ type subresource struct {
 }
 
 // preRegisterSubresource is non-concurrently safe and only called at initialization time
-func (m *RESTManager) preRegisterSubresource(subresource subresource) {
+func (m *RESTManager) preRegisterSubresource(subresource subresource) error {
+	var verbs []string
+	for _, method := range subresource.connecter.ConnectMethods() {
+		if verb := toDiscoveryKubeVerb[method]; verb != "" {
+			verbs = append(verbs, verb)
+		}
+	}
+	if len(verbs) == 0 {
+		return fmt.Errorf("resource['%s/%s'] available verbs are empty", subresource.gr.String(), subresource.name)
+	}
+
 	objGVK := subresource.connecter.(rest.Storage).New().GetObjectKind().GroupVersionKind()
 	apiResource := metav1.APIResource{
 		Name:       subresource.gr.Resource + "/" + subresource.name,
 		Namespaced: subresource.namespaced,
-		Verbs:      subresource.connecter.ConnectMethods(),
+		Verbs:      verbs,
 		Kind:       objGVK.Kind,
 	}
 
@@ -143,6 +169,7 @@ func (m *RESTManager) preRegisterSubresource(subresource subresource) {
 		RequestScope: requestScope,
 		Storage:      subresource.connecter,
 	}
+	return nil
 }
 
 func (m *RESTManager) GetAPIGroups() map[string]metav1.APIGroup {