Feature-gate CSINode and CSIDriver informer starts

pkg/scheduler/framework/plugins/nodevolumelimits/csinode_helper.go

@@ -0,0 +1,32 @@
+/*
+Copyright 2019 The Kubernetes Authors.
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+package nodevolumelimits
+
+import (
+	utilfeature "k8s.io/apiserver/pkg/util/feature"
+	"k8s.io/client-go/informers"
+	v1beta1 "k8s.io/client-go/listers/storage/v1beta1"
+	kubefeatures "k8s.io/kubernetes/pkg/features"
+)
+
+// getCSINodeListerIfEnabled returns the CSINode lister or nil if the feature is disabled
+func getCSINodeListerIfEnabled(factory informers.SharedInformerFactory) v1beta1.CSINodeLister {
+	if !utilfeature.DefaultFeatureGate.Enabled(kubefeatures.CSINodeInfo) {
+		return nil
+	}
+	return factory.Storage().V1beta1().CSINodes().Lister()
+}