add test utils for cluster class

controllers/clustertopology_controller_compute.go

@@ -19,8 +19,10 @@ package controllers
 import (
 	"context"
 
+	corev1 "k8s.io/api/core/v1"
 	"k8s.io/apimachinery/pkg/apis/meta/v1/unstructured"
 	clusterv1 "sigs.k8s.io/cluster-api/api/v1alpha4"
+	"sigs.k8s.io/controller-runtime/pkg/client"
 )
 
 // clusterTopologyClass holds all the objects required for computing the desired state of a managed Cluster topology.
@@ -83,3 +85,59 @@ func (r *ClusterTopologyReconciler) computeDesiredState(ctx context.Context, inp
 	// TODO: add compute logic
 	return nil, nil
 }
+
+// getNestedRef returns the ref value of a nested field.
+// NOTE: This function assumes the reference either exists in the CRD, and in that case the value is required,
+// or it does not exists in the CRD.
+func getNestedRef(obj *unstructured.Unstructured, fields ...string) *corev1.ObjectReference {
+	if obj == nil {
+		return nil
+	}
+	ref, ok, err := unstructured.NestedMap(obj.UnstructuredContent(), fields...)
+	if !ok || err != nil {
+		return nil
+	}
+	kind := ""
+	if v, ok := ref["kind"]; ok {
+		kind = v.(string)
+	}
+	namespace := ""
+	if v, ok := ref["namespace"]; ok {
+		namespace = v.(string)
+	}
+	name := ""
+	if v, ok := ref["name"]; ok {
+		name = v.(string)
+	}
+	apiVersion := ""
+	if v, ok := ref["apiVersion"]; ok {
+		apiVersion = v.(string)
+	}
+	return &corev1.ObjectReference{
+		Kind:       kind,
+		Namespace:  namespace,
+		Name:       name,
+		APIVersion: apiVersion,
+	}
+}
+
+// setNestedRef sets the value of a nested field to a reference to the refObj provided.
+func setNestedRef(obj, refObj *unstructured.Unstructured, fields ...string) error {
+	ref := map[string]interface{}{
+		"kind":       refObj.GetKind(),
+		"namespace":  refObj.GetNamespace(),
+		"name":       refObj.GetName(),
+		"apiVersion": refObj.GetAPIVersion(),
+	}
+	return unstructured.SetNestedField(obj.UnstructuredContent(), ref, fields...)
+}
+
+func objToRef(obj client.Object) *corev1.ObjectReference {
+	gvk := obj.GetObjectKind().GroupVersionKind()
+	return &corev1.ObjectReference{
+		Kind:       gvk.Kind,
+		APIVersion: gvk.GroupVersion().String(),
+		Namespace:  obj.GetNamespace(),
+		Name:       obj.GetName(),
+	}
+}

controllers/clustertopology_controller_compute_test.go

@@ -0,0 +1,291 @@
+/*
+Copyright 2021 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 controllers
+
+import (
+	"testing"
+
+	. "github.com/onsi/gomega"
+	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
+	"k8s.io/apimachinery/pkg/apis/meta/v1/unstructured"
+	"k8s.io/apimachinery/pkg/runtime/schema"
+	clusterv1 "sigs.k8s.io/cluster-api/api/v1alpha4"
+)
+
+func TestGetNestedRef(t *testing.T) {
+	t.Run("Gets a nested ref if defined", func(t *testing.T) {
+		g := NewWithT(t)
+
+		infrastructureMachineTemplate := newFakeInfrastructureMachineTemplate(metav1.NamespaceDefault, "control-plane-machine-infrastructure-template1").Obj()
+		controlPlaneTemplate := newFakeControlPlane(metav1.NamespaceDefault, "control-plane-template").
+			WithInfrastructureMachineTemplate(infrastructureMachineTemplate).
+			Obj()
+
+		ref := getNestedRef(controlPlaneTemplate, "spec", "machineTemplate", "infrastructureRef")
+		g.Expect(ref).ToNot(BeNil())
+		g.Expect(ref.APIVersion).To(Equal(infrastructureMachineTemplate.GetAPIVersion()))
+		g.Expect(ref.Kind).To(Equal(infrastructureMachineTemplate.GetKind()))
+		g.Expect(ref.Name).To(Equal(infrastructureMachineTemplate.GetName()))
+		g.Expect(ref.Namespace).To(Equal(infrastructureMachineTemplate.GetNamespace()))
+	})
+	t.Run("Gets nil if the nested ref does not exist", func(t *testing.T) {
+		g := NewWithT(t)
+
+		controlPlaneTemplate := newFakeControlPlane(metav1.NamespaceDefault, "control-plane-template").Obj()
+
+		ref := getNestedRef(controlPlaneTemplate, "spec", "machineTemplate", "infrastructureRef")
+		g.Expect(ref).To(BeNil())
+	})
+}
+
+func TestSetNestedRef(t *testing.T) {
+	t.Run("Sets a nested ref", func(t *testing.T) {
+		g := NewWithT(t)
+		infrastructureMachineTemplate := newFakeInfrastructureMachineTemplate(metav1.NamespaceDefault, "control-plane-machine-infrastructure-template1").Obj()
+		controlPlaneTemplate := newFakeControlPlane(metav1.NamespaceDefault, "control-plane-template").Obj()
+
+		err := setNestedRef(controlPlaneTemplate, infrastructureMachineTemplate, "spec", "machineTemplate", "infrastructureRef")
+		g.Expect(err).To(BeNil())
+
+		ref := getNestedRef(controlPlaneTemplate, "spec", "machineTemplate", "infrastructureRef")
+		g.Expect(ref).ToNot(BeNil())
+		g.Expect(ref.APIVersion).To(Equal(infrastructureMachineTemplate.GetAPIVersion()))
+		g.Expect(ref.Kind).To(Equal(infrastructureMachineTemplate.GetKind()))
+		g.Expect(ref.Name).To(Equal(infrastructureMachineTemplate.GetName()))
+		g.Expect(ref.Namespace).To(Equal(infrastructureMachineTemplate.GetNamespace()))
+	})
+}
+
+func TestObjToRef(t *testing.T) {
+	t.Run("Gets a ref from an obj", func(t *testing.T) {
+		g := NewWithT(t)
+		infrastructureMachineTemplate := newFakeInfrastructureMachineTemplate(metav1.NamespaceDefault, "control-plane-machine-infrastructure-template1").Obj()
+		ref := objToRef(infrastructureMachineTemplate)
+
+		g.Expect(ref).ToNot(BeNil())
+		g.Expect(ref.APIVersion).To(Equal(infrastructureMachineTemplate.GetAPIVersion()))
+		g.Expect(ref.Kind).To(Equal(infrastructureMachineTemplate.GetKind()))
+		g.Expect(ref.Name).To(Equal(infrastructureMachineTemplate.GetName()))
+		g.Expect(ref.Namespace).To(Equal(infrastructureMachineTemplate.GetNamespace()))
+	})
+}
+
+var (
+	fakeInfrastructureProviderGroupVersion = schema.GroupVersion{Group: "infrastructure.cluster.x-k8s.io", Version: "v1alpha4"}
+	fakeControlPlaneProviderGroupVersion   = schema.GroupVersion{Group: "controlplane.cluster.x-k8s.io", Version: "v1alpha4"}
+)
+
+type fakeClusterClass struct {
+	namespace                     string
+	name                          string
+	infrastructureClusterTemplate *unstructured.Unstructured
+	controlPlaneTemplate          *unstructured.Unstructured
+}
+
+func newFakeClusterClass(namespace, name string) *fakeClusterClass { //nolint:deadcode
+	return &fakeClusterClass{
+		namespace: namespace,
+		name:      name,
+	}
+}
+
+func (f *fakeClusterClass) WithInfrastructureClusterTemplate(t *unstructured.Unstructured) *fakeClusterClass {
+	f.infrastructureClusterTemplate = t
+	return f
+}
+
+func (f *fakeClusterClass) WithControlPlaneTemplate(t *unstructured.Unstructured) *fakeClusterClass {
+	f.controlPlaneTemplate = t
+	return f
+}
+
+func (f *fakeClusterClass) Obj() *clusterv1.ClusterClass {
+	obj := &clusterv1.ClusterClass{
+		TypeMeta: metav1.TypeMeta{
+			Kind:       "ClusterClass",
+			APIVersion: clusterv1.GroupVersion.String(),
+		},
+		ObjectMeta: metav1.ObjectMeta{
+			Name:      f.name,
+			Namespace: f.namespace,
+		},
+		Spec: clusterv1.ClusterClassSpec{},
+	}
+	if f.infrastructureClusterTemplate != nil {
+		obj.Spec.Infrastructure = clusterv1.LocalObjectTemplate{
+			Ref: objToRef(f.infrastructureClusterTemplate),
+		}
+	}
+	if f.controlPlaneTemplate != nil {
+		obj.Spec.ControlPlane = clusterv1.LocalObjectTemplate{
+			Ref: objToRef(f.controlPlaneTemplate),
+		}
+	}
+	return obj
+}
+
+type fakeInfrastructureClusterTemplate struct {
+	namespace string
+	name      string
+}
+
+func newFakeInfrastructureClusterTemplate(namespace, name string) *fakeInfrastructureClusterTemplate { //nolint:deadcode
+	return &fakeInfrastructureClusterTemplate{
+		namespace: namespace,
+		name:      name,
+	}
+}
+
+func (f *fakeInfrastructureClusterTemplate) Obj() *unstructured.Unstructured {
+	obj := &unstructured.Unstructured{}
+	obj.SetAPIVersion(fakeInfrastructureProviderGroupVersion.String())
+	obj.SetKind("FakeInfrastructureClusterTemplate")
+	obj.SetNamespace(f.namespace)
+	obj.SetName(f.name)
+
+	if err := unstructured.SetNestedField(obj.UnstructuredContent(), true, "spec", "template", "spec", "fakeSetting"); err != nil {
+		panic(err)
+	}
+
+	return obj
+}
+
+type fakeInfrastructureMachineTemplate struct {
+	namespace string
+	name      string
+}
+
+func newFakeInfrastructureMachineTemplate(namespace, name string) *fakeInfrastructureMachineTemplate {
+	return &fakeInfrastructureMachineTemplate{
+		namespace: namespace,
+		name:      name,
+	}
+}
+
+func (f *fakeInfrastructureMachineTemplate) Obj() *unstructured.Unstructured {
+	obj := &unstructured.Unstructured{}
+	obj.SetAPIVersion(fakeInfrastructureProviderGroupVersion.String())
+	obj.SetKind("FakeInfrastructureMachineTemplate")
+	obj.SetNamespace(f.namespace)
+	obj.SetName(f.name)
+
+	if err := unstructured.SetNestedField(obj.UnstructuredContent(), true, "spec", "template", "spec", "fakeSetting"); err != nil {
+		panic(err)
+	}
+
+	return obj
+}
+
+type fakeControlPlaneTemplate struct {
+	namespace                     string
+	name                          string
+	infrastructureMachineTemplate *unstructured.Unstructured
+}
+
+func newFakeControlPlaneTemplate(namespace, name string) *fakeControlPlaneTemplate { //nolint:deadcode
+	return &fakeControlPlaneTemplate{
+		namespace: namespace,
+		name:      name,
+	}
+}
+
+func (f *fakeControlPlaneTemplate) WithInfrastructureMachineTemplate(t *unstructured.Unstructured) *fakeControlPlaneTemplate {
+	f.infrastructureMachineTemplate = t
+	return f
+}
+
+func (f *fakeControlPlaneTemplate) Obj() *unstructured.Unstructured {
+	obj := &unstructured.Unstructured{}
+	obj.SetAPIVersion(fakeControlPlaneProviderGroupVersion.String())
+	obj.SetKind("FakeControlPlaneTemplate")
+	obj.SetNamespace(f.namespace)
+	obj.SetName(f.name)
+
+	if err := unstructured.SetNestedField(obj.UnstructuredContent(), true, "spec", "template", "spec", "fakeSetting"); err != nil {
+		panic(err)
+	}
+
+	if f.infrastructureMachineTemplate != nil {
+		if err := setNestedRef(obj, f.infrastructureMachineTemplate, "spec", "template", "spec", "machineTemplate", "infrastructureRef"); err != nil {
+			panic(err)
+		}
+	}
+	return obj
+}
+
+type fakeInfrastructureCluster struct {
+	namespace string
+	name      string
+}
+
+func newFakeInfrastructureCluster(namespace, name string) *fakeInfrastructureCluster { //nolint:deadcode
+	return &fakeInfrastructureCluster{
+		namespace: namespace,
+		name:      name,
+	}
+}
+
+func (f *fakeInfrastructureCluster) Obj() *unstructured.Unstructured {
+	obj := &unstructured.Unstructured{}
+	obj.SetAPIVersion(fakeControlPlaneProviderGroupVersion.String())
+	obj.SetKind("FakeInfrastructureCluster")
+	obj.SetNamespace(f.namespace)
+	obj.SetName(f.name)
+
+	if err := unstructured.SetNestedField(obj.UnstructuredContent(), true, "spec", "fakeSetting"); err != nil {
+		panic(err)
+	}
+
+	return obj
+}
+
+type fakeControlPlane struct {
+	namespace                     string
+	name                          string
+	infrastructureMachineTemplate *unstructured.Unstructured
+}
+
+func newFakeControlPlane(namespace, name string) *fakeControlPlane {
+	return &fakeControlPlane{
+		namespace: namespace,
+		name:      name,
+	}
+}
+
+func (f *fakeControlPlane) WithInfrastructureMachineTemplate(t *unstructured.Unstructured) *fakeControlPlane {
+	f.infrastructureMachineTemplate = t
+	return f
+}
+
+func (f *fakeControlPlane) Obj() *unstructured.Unstructured {
+	obj := &unstructured.Unstructured{}
+	obj.SetAPIVersion(fakeControlPlaneProviderGroupVersion.String())
+	obj.SetKind("FakeControlPlane")
+	obj.SetNamespace(f.namespace)
+	obj.SetName(f.name)
+
+	if err := unstructured.SetNestedField(obj.UnstructuredContent(), true, "spec", "fakeSetting"); err != nil {
+		panic(err)
+	}
+
+	if f.infrastructureMachineTemplate != nil {
+		if err := setNestedRef(obj, f.infrastructureMachineTemplate, "spec", "machineTemplate", "infrastructureRef"); err != nil {
+			panic(err)
+		}
+	}
+	return obj
+}