Merge pull request #68 from yue9944882/feat/post-start-hook-shortcut

Feat: Adding a short-cut for registering post-start hook

pkg/builder/builder_misc.go

@@ -3,6 +3,7 @@ package builder
 import (
 	"k8s.io/apimachinery/pkg/runtime"
 	genericapiserver "k8s.io/apiserver/pkg/server"
+	"k8s.io/klog/v2"
 	openapicommon "k8s.io/kube-openapi/pkg/common"
 	"sigs.k8s.io/apiserver-runtime/internal/sample-apiserver/pkg/cmd/server"
 	"sigs.k8s.io/apiserver-runtime/pkg/util/loopback"
@@ -24,6 +25,18 @@ func (a *Server) WithOpenAPIDefinitions(
 	return a
 }
 
+// WithPostStartHook registers a post start hook which will be invoked after the apiserver is started
+// and before it's ready for serving requests.
+func (a *Server) WithPostStartHook(name string, hookFunc genericapiserver.PostStartHookFunc) *Server {
+	a.WithServerFns(func(server *GenericAPIServer) *GenericAPIServer {
+		if err := server.AddPostStartHook(name, hookFunc); err != nil {
+			klog.Fatal("failed registering post-start hook %v: %v", name, err)
+		}
+		return server
+	})
+	return a
+}
+
 // WithAdditionalSchemeInstallers registers functions to install additional functions or resources into the Scheme.
 // This can be used to manually registering defaulting functions, conversion functions, or resource types, rather
 // than registering them automatically by implementing the corresponding interfaces on the resources.