apiextensions: wait for complete discovery endpoint

staging/src/k8s.io/apiextensions-apiserver/pkg/apiserver/apiserver.go

@@ -207,7 +207,7 @@ func (c completedConfig) New(delegationTarget genericapiserver.DelegationTarget)
 	s.GenericAPIServer.Handler.NonGoRestfulMux.Handle("/apis", crdHandler)
 	s.GenericAPIServer.Handler.NonGoRestfulMux.HandlePrefix("/apis/", crdHandler)
 
-	crdController := NewDiscoveryController(s.Informers.Apiextensions().V1().CustomResourceDefinitions(), versionDiscoveryHandler, groupDiscoveryHandler)
+	discoveryController := NewDiscoveryController(s.Informers.Apiextensions().V1().CustomResourceDefinitions(), versionDiscoveryHandler, groupDiscoveryHandler)
 	namingController := status.NewNamingConditionController(s.Informers.Apiextensions().V1().CustomResourceDefinitions(), crdClient.ApiextensionsV1())
 	nonStructuralSchemaController := nonstructuralschema.NewConditionController(s.Informers.Apiextensions().V1().CustomResourceDefinitions(), crdClient.ApiextensionsV1())
 	apiApprovalController := apiapproval.NewKubernetesAPIApprovalPolicyConformantConditionController(s.Informers.Apiextensions().V1().CustomResourceDefinitions(), crdClient.ApiextensionsV1())
@@ -231,12 +231,19 @@ func (c completedConfig) New(delegationTarget genericapiserver.DelegationTarget)
 			go openapiController.Run(s.GenericAPIServer.StaticOpenAPISpec, s.GenericAPIServer.OpenAPIVersionedService, context.StopCh)
 		}
 
-		go crdController.Run(context.StopCh)
 		go namingController.Run(context.StopCh)
 		go establishingController.Run(context.StopCh)
 		go nonStructuralSchemaController.Run(5, context.StopCh)
 		go apiApprovalController.Run(5, context.StopCh)
 		go finalizingController.Run(5, context.StopCh)
+
+		discoverySyncedCh := make(chan struct{})
+		go discoveryController.Run(context.StopCh, discoverySyncedCh)
+		select {
+		case <-context.StopCh:
+		case <-discoverySyncedCh:
+		}
+
 		return nil
 	})
 	// we don't want to report healthy until we can handle all CRDs that have already been registered.  Waiting for the informer

staging/src/k8s.io/apiextensions-apiserver/pkg/apiserver/customresource_discovery_controller.go

@@ -201,7 +201,7 @@ func sortGroupDiscoveryByKubeAwareVersion(gd []metav1.GroupVersionForDiscovery)
 	})
 }
 
-func (c *DiscoveryController) Run(stopCh <-chan struct{}) {
+func (c *DiscoveryController) Run(stopCh <-chan struct{}, synchedCh chan<- struct{}) {
 	defer utilruntime.HandleCrash()
 	defer c.queue.ShutDown()
 	defer klog.Infof("Shutting down DiscoveryController")
@@ -213,6 +213,31 @@ func (c *DiscoveryController) Run(stopCh <-chan struct{}) {
 		return
 	}
 
+	// initially sync all group versions to make sure we serve complete discovery
+	if err := wait.PollImmediateUntil(time.Second, func() (bool, error) {
+		crds, err := c.crdLister.List(labels.Everything())
+		if err != nil {
+			utilruntime.HandleError(fmt.Errorf("failed to initially list CRDs: %v", err))
+			return false, nil
+		}
+		for _, crd := range crds {
+			for _, v := range crd.Spec.Versions {
+				gv := schema.GroupVersion{crd.Spec.Group, v.Name}
+				if err := c.sync(gv); err != nil {
+					utilruntime.HandleError(fmt.Errorf("failed to initially sync CRD version %v: %v", gv, err))
+					return false, nil
+				}
+			}
+		}
+		return true, nil
+	}, stopCh); err == wait.ErrWaitTimeout {
+		utilruntime.HandleError(fmt.Errorf("timed out waiting for discovery endpoint to initialize"))
+		return
+	} else if err != nil {
+		panic(fmt.Errorf("unexpected error: %v", err))
+	}
+	close(synchedCh)
+
 	// only start one worker thread since its a slow moving API
 	go wait.Until(c.runWorker, time.Second, stopCh)