Refactored runtime.Object helper functions into subpkg

Organized functions that abstract the access of
k8s.io/apimachinery/pkg/runtime.Objects into a framework subpackge.

Signed-off-by: Jorge Alarcon Ochoa <alarcj137@gmail.com>

test/e2e/framework/resource/runtimeobj.go

@@ -0,0 +1,123 @@
+/*
+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 resource
+
+import (
+	"fmt"
+
+	appsv1 "k8s.io/api/apps/v1"
+	batchv1 "k8s.io/api/batch/v1"
+	v1 "k8s.io/api/core/v1"
+	extensionsv1beta1 "k8s.io/api/extensions/v1beta1"
+	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
+	"k8s.io/apimachinery/pkg/labels"
+	"k8s.io/apimachinery/pkg/runtime"
+	"k8s.io/apimachinery/pkg/runtime/schema"
+	clientset "k8s.io/client-go/kubernetes"
+	appsinternal "k8s.io/kubernetes/pkg/apis/apps"
+	batchinternal "k8s.io/kubernetes/pkg/apis/batch"
+	api "k8s.io/kubernetes/pkg/apis/core"
+	extensionsinternal "k8s.io/kubernetes/pkg/apis/extensions"
+)
+
+// GetRuntimeObjectForKind returns a runtime.Object based on its GroupKind,
+// namespace and name.
+func GetRuntimeObjectForKind(c clientset.Interface, kind schema.GroupKind, ns, name string) (runtime.Object, error) {
+	switch kind {
+	case api.Kind("ReplicationController"):
+		return c.CoreV1().ReplicationControllers(ns).Get(name, metav1.GetOptions{})
+	case extensionsinternal.Kind("ReplicaSet"), appsinternal.Kind("ReplicaSet"):
+		return c.AppsV1().ReplicaSets(ns).Get(name, metav1.GetOptions{})
+	case extensionsinternal.Kind("Deployment"), appsinternal.Kind("Deployment"):
+		return c.AppsV1().Deployments(ns).Get(name, metav1.GetOptions{})
+	case extensionsinternal.Kind("DaemonSet"):
+		return c.AppsV1().DaemonSets(ns).Get(name, metav1.GetOptions{})
+	case batchinternal.Kind("Job"):
+		return c.BatchV1().Jobs(ns).Get(name, metav1.GetOptions{})
+	default:
+		return nil, fmt.Errorf("Unsupported kind when getting runtime object: %v", kind)
+	}
+}
+
+// GetSelectorFromRuntimeObject returns the labels for the given object.
+func GetSelectorFromRuntimeObject(obj runtime.Object) (labels.Selector, error) {
+	switch typed := obj.(type) {
+	case *v1.ReplicationController:
+		return labels.SelectorFromSet(typed.Spec.Selector), nil
+	case *extensionsv1beta1.ReplicaSet:
+		return metav1.LabelSelectorAsSelector(typed.Spec.Selector)
+	case *appsv1.ReplicaSet:
+		return metav1.LabelSelectorAsSelector(typed.Spec.Selector)
+	case *extensionsv1beta1.Deployment:
+		return metav1.LabelSelectorAsSelector(typed.Spec.Selector)
+	case *appsv1.Deployment:
+		return metav1.LabelSelectorAsSelector(typed.Spec.Selector)
+	case *extensionsv1beta1.DaemonSet:
+		return metav1.LabelSelectorAsSelector(typed.Spec.Selector)
+	case *appsv1.DaemonSet:
+		return metav1.LabelSelectorAsSelector(typed.Spec.Selector)
+	case *batchv1.Job:
+		return metav1.LabelSelectorAsSelector(typed.Spec.Selector)
+	default:
+		return nil, fmt.Errorf("Unsupported kind when getting selector: %v", obj)
+	}
+}
+
+// GetReplicasFromRuntimeObject returns the number of replicas for the given
+// object.
+func GetReplicasFromRuntimeObject(obj runtime.Object) (int32, error) {
+	switch typed := obj.(type) {
+	case *v1.ReplicationController:
+		if typed.Spec.Replicas != nil {
+			return *typed.Spec.Replicas, nil
+		}
+		return 0, nil
+	case *extensionsv1beta1.ReplicaSet:
+		if typed.Spec.Replicas != nil {
+			return *typed.Spec.Replicas, nil
+		}
+		return 0, nil
+	case *appsv1.ReplicaSet:
+		if typed.Spec.Replicas != nil {
+			return *typed.Spec.Replicas, nil
+		}
+		return 0, nil
+	case *extensionsv1beta1.Deployment:
+		if typed.Spec.Replicas != nil {
+			return *typed.Spec.Replicas, nil
+		}
+		return 0, nil
+	case *appsv1.Deployment:
+		if typed.Spec.Replicas != nil {
+			return *typed.Spec.Replicas, nil
+		}
+		return 0, nil
+	case *extensionsv1beta1.DaemonSet:
+		return 0, nil
+	case *appsv1.DaemonSet:
+		return 0, nil
+	case *batchv1.Job:
+		// TODO: currently we use pause pods so that's OK. When we'll want to switch to Pods
+		// that actually finish we need a better way to do this.
+		if typed.Spec.Parallelism != nil {
+			return *typed.Spec.Parallelism, nil
+		}
+		return 0, nil
+	default:
+		return -1, fmt.Errorf("Unsupported kind when getting number of replicas: %v", obj)
+	}
+}