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279 lines
8.5 KiB
Go
279 lines
8.5 KiB
Go
/*
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Copyright 2018 The Kubernetes Authors.
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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package pvprotection
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import (
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"errors"
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"reflect"
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"testing"
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"time"
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"github.com/davecgh/go-spew/spew"
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"k8s.io/api/core/v1"
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apierrors "k8s.io/apimachinery/pkg/api/errors"
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"k8s.io/apimachinery/pkg/api/meta"
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metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
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"k8s.io/apimachinery/pkg/runtime"
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"k8s.io/apimachinery/pkg/runtime/schema"
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"k8s.io/client-go/informers"
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"k8s.io/client-go/kubernetes/fake"
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clienttesting "k8s.io/client-go/testing"
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"k8s.io/klog"
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"k8s.io/kubernetes/pkg/controller"
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volumeutil "k8s.io/kubernetes/pkg/volume/util"
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)
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const defaultPVName = "default-pv"
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type reaction struct {
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verb string
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resource string
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reactorfn clienttesting.ReactionFunc
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}
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func pv() *v1.PersistentVolume {
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return &v1.PersistentVolume{
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ObjectMeta: metav1.ObjectMeta{
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Name: defaultPVName,
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},
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}
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}
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func boundPV() *v1.PersistentVolume {
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return &v1.PersistentVolume{
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ObjectMeta: metav1.ObjectMeta{
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Name: defaultPVName,
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},
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Status: v1.PersistentVolumeStatus{
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Phase: v1.VolumeBound,
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},
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}
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}
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func withProtectionFinalizer(pv *v1.PersistentVolume) *v1.PersistentVolume {
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pv.Finalizers = append(pv.Finalizers, volumeutil.PVProtectionFinalizer)
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return pv
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}
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func generateUpdateErrorFunc(t *testing.T, failures int) clienttesting.ReactionFunc {
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i := 0
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return func(action clienttesting.Action) (bool, runtime.Object, error) {
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i++
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if i <= failures {
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// Update fails
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update, ok := action.(clienttesting.UpdateAction)
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if !ok {
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t.Fatalf("Reactor got non-update action: %+v", action)
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}
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acc, _ := meta.Accessor(update.GetObject())
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return true, nil, apierrors.NewForbidden(update.GetResource().GroupResource(), acc.GetName(), errors.New("Mock error"))
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}
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// Update succeeds
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return false, nil, nil
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}
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}
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func deleted(pv *v1.PersistentVolume) *v1.PersistentVolume {
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pv.DeletionTimestamp = &metav1.Time{}
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return pv
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}
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func TestPVProtectionController(t *testing.T) {
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pvVer := schema.GroupVersionResource{
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Group: v1.GroupName,
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Version: "v1",
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Resource: "persistentvolumes",
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}
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tests := []struct {
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name string
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// Object to insert into fake kubeclient before the test starts.
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initialObjects []runtime.Object
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// Optional client reactors.
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reactors []reaction
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// PV event to simulate. This PV will be automatically added to
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// initalObjects.
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updatedPV *v1.PersistentVolume
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// List of expected kubeclient actions that should happen during the
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// test.
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expectedActions []clienttesting.Action
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storageObjectInUseProtectionEnabled bool
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}{
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// PV events
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//
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{
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name: "StorageObjectInUseProtection Enabled, PV without finalizer -> finalizer is added",
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updatedPV: pv(),
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expectedActions: []clienttesting.Action{
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clienttesting.NewUpdateAction(pvVer, "", withProtectionFinalizer(pv())),
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},
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storageObjectInUseProtectionEnabled: true,
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},
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{
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name: "StorageObjectInUseProtection Disabled, PV without finalizer -> finalizer is added",
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updatedPV: pv(),
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expectedActions: []clienttesting.Action{},
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storageObjectInUseProtectionEnabled: false,
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},
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{
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name: "PVC with finalizer -> no action",
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updatedPV: withProtectionFinalizer(pv()),
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expectedActions: []clienttesting.Action{},
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storageObjectInUseProtectionEnabled: true,
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},
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{
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name: "saving PVC finalizer fails -> controller retries",
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updatedPV: pv(),
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reactors: []reaction{
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{
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verb: "update",
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resource: "persistentvolumes",
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reactorfn: generateUpdateErrorFunc(t, 2 /* update fails twice*/),
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},
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},
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expectedActions: []clienttesting.Action{
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// This fails
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clienttesting.NewUpdateAction(pvVer, "", withProtectionFinalizer(pv())),
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// This fails too
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clienttesting.NewUpdateAction(pvVer, "", withProtectionFinalizer(pv())),
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// This succeeds
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clienttesting.NewUpdateAction(pvVer, "", withProtectionFinalizer(pv())),
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},
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storageObjectInUseProtectionEnabled: true,
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},
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{
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name: "StorageObjectInUseProtection Enabled, deleted PV with finalizer -> finalizer is removed",
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updatedPV: deleted(withProtectionFinalizer(pv())),
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expectedActions: []clienttesting.Action{
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clienttesting.NewUpdateAction(pvVer, "", deleted(pv())),
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},
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storageObjectInUseProtectionEnabled: true,
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},
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{
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name: "StorageObjectInUseProtection Disabled, deleted PV with finalizer -> finalizer is removed",
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updatedPV: deleted(withProtectionFinalizer(pv())),
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expectedActions: []clienttesting.Action{
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clienttesting.NewUpdateAction(pvVer, "", deleted(pv())),
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},
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storageObjectInUseProtectionEnabled: false,
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},
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{
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name: "finalizer removal fails -> controller retries",
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updatedPV: deleted(withProtectionFinalizer(pv())),
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reactors: []reaction{
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{
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verb: "update",
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resource: "persistentvolumes",
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reactorfn: generateUpdateErrorFunc(t, 2 /* update fails twice*/),
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},
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},
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expectedActions: []clienttesting.Action{
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// Fails
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clienttesting.NewUpdateAction(pvVer, "", deleted(pv())),
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// Fails too
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clienttesting.NewUpdateAction(pvVer, "", deleted(pv())),
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// Succeeds
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clienttesting.NewUpdateAction(pvVer, "", deleted(pv())),
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},
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storageObjectInUseProtectionEnabled: true,
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},
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{
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name: "deleted PVC with finalizer + PV is bound -> finalizer is not removed",
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updatedPV: deleted(withProtectionFinalizer(boundPV())),
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expectedActions: []clienttesting.Action{},
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storageObjectInUseProtectionEnabled: true,
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},
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}
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for _, test := range tests {
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// Create client with initial data
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objs := test.initialObjects
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if test.updatedPV != nil {
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objs = append(objs, test.updatedPV)
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}
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client := fake.NewSimpleClientset(objs...)
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// Create informers
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informers := informers.NewSharedInformerFactory(client, controller.NoResyncPeriodFunc())
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pvInformer := informers.Core().V1().PersistentVolumes()
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// Populate the informers with initial objects so the controller can
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// Get() it.
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for _, obj := range objs {
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switch obj.(type) {
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case *v1.PersistentVolume:
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pvInformer.Informer().GetStore().Add(obj)
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default:
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t.Fatalf("Unknown initalObject type: %+v", obj)
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}
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}
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// Add reactor to inject test errors.
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for _, reactor := range test.reactors {
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client.Fake.PrependReactor(reactor.verb, reactor.resource, reactor.reactorfn)
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}
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// Create the controller
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ctrl := NewPVProtectionController(pvInformer, client, test.storageObjectInUseProtectionEnabled)
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// Start the test by simulating an event
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if test.updatedPV != nil {
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ctrl.pvAddedUpdated(test.updatedPV)
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}
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// Process the controller queue until we get expected results
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timeout := time.Now().Add(10 * time.Second)
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lastReportedActionCount := 0
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for {
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if time.Now().After(timeout) {
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t.Errorf("Test %q: timed out", test.name)
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break
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}
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if ctrl.queue.Len() > 0 {
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klog.V(5).Infof("Test %q: %d events queue, processing one", test.name, ctrl.queue.Len())
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ctrl.processNextWorkItem()
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}
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if ctrl.queue.Len() > 0 {
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// There is still some work in the queue, process it now
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continue
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}
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currentActionCount := len(client.Actions())
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if currentActionCount < len(test.expectedActions) {
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// Do not log evey wait, only when the action count changes.
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if lastReportedActionCount < currentActionCount {
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klog.V(5).Infof("Test %q: got %d actions out of %d, waiting for the rest", test.name, currentActionCount, len(test.expectedActions))
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lastReportedActionCount = currentActionCount
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}
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// The test expected more to happen, wait for the actions.
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// Most probably it's exponential backoff
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time.Sleep(10 * time.Millisecond)
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continue
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}
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break
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}
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actions := client.Actions()
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if !reflect.DeepEqual(actions, test.expectedActions) {
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t.Errorf("Test %q: action not expected\nExpected:\n%s\ngot:\n%s", test.name, spew.Sdump(test.expectedActions), spew.Sdump(actions))
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}
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}
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}
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