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main_test.go
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main_test.go
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package main
import (
"context"
"testing"
"time"
"github.com/TwiN/kevent"
appsv1 "k8s.io/api/apps/v1"
v1 "k8s.io/api/core/v1"
metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
"k8s.io/apimachinery/pkg/apis/meta/v1/unstructured"
"k8s.io/apimachinery/pkg/runtime"
"k8s.io/apimachinery/pkg/runtime/schema"
fakediscovery "k8s.io/client-go/discovery/fake"
fakedynamic "k8s.io/client-go/dynamic/fake"
fakekubernetes "k8s.io/client-go/kubernetes/fake"
)
func TestReconcile(t *testing.T) {
// Before jumping into this test, you must understand that kubernetesClient and dynamicClient are used for two different purposes:
// - kubernetesClient: Takes care of discovery. This means that we need to inject the API resources we want to test through dynamicClient
// - dynamicClient: Takes care of listing and deleting resources.
// Create scheme
scheme := runtime.NewScheme()
_ = appsv1.AddToScheme(scheme)
_ = v1.AddToScheme(scheme)
_ = metav1.AddMetaToScheme(scheme)
// Create scenarios
scenarios := []struct {
name string
podsToCreate []*unstructured.Unstructured
expectedResourcesLeftAfterReconciliation int
}{
{
name: "expired-pod-is-deleted",
podsToCreate: []*unstructured.Unstructured{
newUnstructuredWithAnnotations("v1", "Pod", "default", "expired-pod-name", time.Now().Add(-time.Hour), map[string]interface{}{AnnotationTTL: "5m"}),
},
expectedResourcesLeftAfterReconciliation: 0,
},
{
name: "not-expired-pod-is-not-deleted",
podsToCreate: []*unstructured.Unstructured{
newUnstructuredWithAnnotations("v1", "Pod", "default", "not-expired-pod-name", time.Now().Add(-time.Hour), map[string]interface{}{AnnotationTTL: "3d"}),
},
expectedResourcesLeftAfterReconciliation: 1,
},
{
name: "unannotated-pod-is-not-deleted",
podsToCreate: []*unstructured.Unstructured{
newUnstructuredWithAnnotations("v1", "Pod", "default", "unannotated-pod-name", time.Now().Add(-time.Hour), map[string]interface{}{}),
},
expectedResourcesLeftAfterReconciliation: 1,
},
{
name: "one-out-of-two-pods-is-deleted-because-only-one-expired",
podsToCreate: []*unstructured.Unstructured{
newUnstructuredWithAnnotations("v1", "Pod", "default", "not-expired-pod-name", time.Now().Add(-time.Hour), map[string]interface{}{AnnotationTTL: "3d"}),
newUnstructuredWithAnnotations("v1", "Pod", "default", "expired-pod-name", time.Now().Add(-time.Hour), map[string]interface{}{AnnotationTTL: "5m"}),
},
expectedResourcesLeftAfterReconciliation: 1,
},
{
name: "multiple-expired-pods-are-deleted",
podsToCreate: []*unstructured.Unstructured{
newUnstructuredWithAnnotations("v1", "Pod", "default", "expired-pod-name-1", time.Now().Add(-time.Hour), map[string]interface{}{AnnotationTTL: "5m"}),
newUnstructuredWithAnnotations("v1", "Pod", "default", "expired-pod-name-2", time.Now().Add(-72*time.Hour), map[string]interface{}{AnnotationTTL: "2d"}),
},
expectedResourcesLeftAfterReconciliation: 0,
},
{
name: "only-expired-pods-are-deleted",
podsToCreate: []*unstructured.Unstructured{
newUnstructuredWithAnnotations("v1", "Pod", "default", "expired-pod-name-1", time.Now().Add(-time.Hour), map[string]interface{}{AnnotationTTL: "5m"}),
newUnstructuredWithAnnotations("v1", "Pod", "default", "not-expired-pod-name", time.Now().Add(-time.Hour), map[string]interface{}{AnnotationTTL: "3d"}),
newUnstructuredWithAnnotations("v1", "Pod", "default", "expired-pod-name-2", time.Now().Add(-72*time.Hour), map[string]interface{}{AnnotationTTL: "2d"}),
newUnstructuredWithAnnotations("v1", "Pod", "default", "unannotated-pod-name", time.Now().Add(-time.Hour), map[string]interface{}{}),
},
expectedResourcesLeftAfterReconciliation: 2,
},
{
name: "expired-pod-is-deleted-by-refreshed-at",
podsToCreate: []*unstructured.Unstructured{
newUnstructuredWithAnnotations("v1", "Pod", "default", "expired-pod-name", time.Now().Add(-time.Hour), map[string]interface{}{AnnotationTTL: "5m", AnnotationRefreshedAt: time.Now().Add(-10 * time.Minute).Format(time.RFC3339)}),
},
expectedResourcesLeftAfterReconciliation: 0,
},
{
name: "not-expired-pod-is-not-deleted-by-refreshed-at",
podsToCreate: []*unstructured.Unstructured{
newUnstructuredWithAnnotations("v1", "Pod", "default", "not-expired-pod-name", time.Now().Add(-time.Hour), map[string]interface{}{AnnotationTTL: "3d", AnnotationRefreshedAt: time.Now().Add(-10 * time.Minute).Format(time.RFC3339)}),
},
expectedResourcesLeftAfterReconciliation: 1,
},
{
name: "unannotated-pod-is-not-deleted-by-refreshed-at",
podsToCreate: []*unstructured.Unstructured{
newUnstructuredWithAnnotations("v1", "Pod", "default", "unannotated-pod-name", time.Now().Add(-time.Hour), map[string]interface{}{AnnotationRefreshedAt: time.Now().Add(-10 * time.Minute).Format(time.RFC3339)}),
},
expectedResourcesLeftAfterReconciliation: 1,
},
{
name: "one-out-of-two-pods-is-deleted-because-only-one-expired-by-refreshed-at",
podsToCreate: []*unstructured.Unstructured{
newUnstructuredWithAnnotations("v1", "Pod", "default", "not-expired-pod-name", time.Now().Add(-time.Hour), map[string]interface{}{AnnotationTTL: "3d", AnnotationRefreshedAt: time.Now().Add(-10 * time.Minute).Format(time.RFC3339)}),
newUnstructuredWithAnnotations("v1", "Pod", "default", "expired-pod-name", time.Now().Add(-time.Hour), map[string]interface{}{AnnotationTTL: "5m", AnnotationRefreshedAt: time.Now().Add(-10 * time.Minute).Format(time.RFC3339)}),
},
expectedResourcesLeftAfterReconciliation: 1,
},
{
name: "multiple-expired-pods-are-deleted-by-refreshed-at",
podsToCreate: []*unstructured.Unstructured{
newUnstructuredWithAnnotations("v1", "Pod", "default", "expired-pod-name-1", time.Now().Add(-time.Hour), map[string]interface{}{AnnotationTTL: "5m", AnnotationRefreshedAt: time.Now().Add(-10 * time.Minute).Format(time.RFC3339)}),
newUnstructuredWithAnnotations("v1", "Pod", "default", "expired-pod-name-2", time.Now().Add(-72*time.Hour), map[string]interface{}{AnnotationTTL: "2d", AnnotationRefreshedAt: time.Now().Add(-49 * time.Hour).Format(time.RFC3339)}),
},
expectedResourcesLeftAfterReconciliation: 0,
},
{
name: "only-expired-pods-are-deleted-by-refreshed-at",
podsToCreate: []*unstructured.Unstructured{
newUnstructuredWithAnnotations("v1", "Pod", "default", "expired-pod-name-1", time.Now().Add(-time.Hour), map[string]interface{}{AnnotationTTL: "5m", AnnotationRefreshedAt: time.Now().Add(-10 * time.Minute).Format(time.RFC3339)}),
newUnstructuredWithAnnotations("v1", "Pod", "default", "not-expired-pod-name", time.Now().Add(-time.Hour), map[string]interface{}{AnnotationTTL: "3d", AnnotationRefreshedAt: time.Now().Add(-10 * time.Minute).Format(time.RFC3339)}),
newUnstructuredWithAnnotations("v1", "Pod", "default", "expired-pod-name-2", time.Now().Add(-72*time.Hour), map[string]interface{}{AnnotationTTL: "2d", AnnotationRefreshedAt: time.Now().Add(-49 * time.Hour).Format(time.RFC3339)}),
newUnstructuredWithAnnotations("v1", "Pod", "default", "unannotated-pod-name", time.Now().Add(-time.Hour), map[string]interface{}{AnnotationRefreshedAt: time.Now().Add(-10 * time.Minute).Format(time.RFC3339)}),
},
expectedResourcesLeftAfterReconciliation: 2,
},
}
// Run scenarios
for _, scenario := range scenarios {
// Create clients
kubernetesClient := fakekubernetes.NewSimpleClientset()
dynamicClient := fakedynamic.NewSimpleDynamicClient(scheme)
eventManager := kevent.NewEventManager(kubernetesClient, "k8s-ttl-controller")
fakeDiscovery, _ := kubernetesClient.Discovery().(*fakediscovery.FakeDiscovery)
fakeDiscovery.Fake.Resources = []*metav1.APIResourceList{
{
GroupVersion: "v1",
APIResources: []metav1.APIResource{
{
Name: "pods",
Kind: "Pod",
Namespaced: true,
Verbs: []string{"create", "delete", "get", "list", "patch", "update", "watch"},
},
},
},
}
// Run scenario
t.Run(scenario.name, func(t *testing.T) {
for _, podToCreate := range scenario.podsToCreate {
_, err := dynamicClient.Resource(schema.GroupVersionResource{Group: "", Version: "v1", Resource: "pods"}).Namespace("default").Create(context.TODO(), podToCreate, metav1.CreateOptions{})
if err != nil {
t.Errorf("unexpected error: %v", err)
}
}
// Make sure that the resources have been created
list, err := dynamicClient.Resource(schema.GroupVersionResource{Group: "", Version: "v1", Resource: "pods"}).Namespace("default").List(context.TODO(), metav1.ListOptions{})
if err != nil {
t.Errorf("unexpected error: %v", err)
}
if len(list.Items) != len(scenario.podsToCreate) {
t.Errorf("expected 3 resources, got %d", len(list.Items))
}
// Reconcile once
if err = Reconcile(kubernetesClient, dynamicClient, eventManager); err != nil {
t.Errorf("unexpected error: %v", err)
}
// Make sure that the expired resources have been deleted
list, err = dynamicClient.Resource(schema.GroupVersionResource{Group: "", Version: "v1", Resource: "pods"}).Namespace("default").List(context.TODO(), metav1.ListOptions{})
if err != nil {
t.Errorf("unexpected error: %v", err)
}
if len(list.Items) != scenario.expectedResourcesLeftAfterReconciliation {
t.Errorf("expected 3 resources, got %d", len(list.Items))
}
})
}
}
func newUnstructuredWithAnnotations(apiVersion, kind, namespace, name string, creationTimestamp time.Time, annotations map[string]interface{}) *unstructured.Unstructured {
return &unstructured.Unstructured{
Object: map[string]interface{}{
"apiVersion": apiVersion,
"kind": kind,
"metadata": map[string]interface{}{
"namespace": namespace,
"name": name,
"creationTimestamp": creationTimestamp.Format(time.RFC3339),
"annotations": annotations,
},
},
}
}