custom-kube-scheduler/kubernetes/pkg/controller/daemon/daemon_controller_test.go

/*
Copyright 2015 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 daemon

import (
	"fmt"
	"reflect"
	"sort"
	"strconv"
	"sync"
	"testing"
	"time"

	apps "k8s.io/api/apps/v1"
	v1 "k8s.io/api/core/v1"
	"k8s.io/apimachinery/pkg/api/resource"
	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
	"k8s.io/apimachinery/pkg/runtime"
	"k8s.io/apimachinery/pkg/util/clock"
	"k8s.io/apimachinery/pkg/util/intstr"
	"k8s.io/apimachinery/pkg/util/uuid"
	"k8s.io/apiserver/pkg/storage/names"
	"k8s.io/client-go/informers"
	"k8s.io/client-go/kubernetes/fake"
	core "k8s.io/client-go/testing"
	"k8s.io/client-go/tools/cache"
	"k8s.io/client-go/tools/record"
	"k8s.io/client-go/util/flowcontrol"
	"k8s.io/client-go/util/workqueue"
	"k8s.io/kubernetes/pkg/api/legacyscheme"
	podutil "k8s.io/kubernetes/pkg/api/v1/pod"
	api "k8s.io/kubernetes/pkg/apis/core"
	"k8s.io/kubernetes/pkg/apis/scheduling"
	"k8s.io/kubernetes/pkg/controller"
	"k8s.io/kubernetes/pkg/securitycontext"
	labelsutil "k8s.io/kubernetes/pkg/util/labels"
)

var (
	simpleDaemonSetLabel  = map[string]string{"name": "simple-daemon", "type": "production"}
	simpleDaemonSetLabel2 = map[string]string{"name": "simple-daemon", "type": "test"}
	simpleNodeLabel       = map[string]string{"color": "blue", "speed": "fast"}
	simpleNodeLabel2      = map[string]string{"color": "red", "speed": "fast"}
	alwaysReady           = func() bool { return true }
)

var (
	noScheduleTolerations = []v1.Toleration{{Key: "dedicated", Value: "user1", Effect: "NoSchedule"}}
	noScheduleTaints      = []v1.Taint{{Key: "dedicated", Value: "user1", Effect: "NoSchedule"}}
	noExecuteTaints       = []v1.Taint{{Key: "dedicated", Value: "user1", Effect: "NoExecute"}}
)

func nowPointer() *metav1.Time {
	now := metav1.Now()
	return &now
}

var (
	nodeNotReady = []v1.Taint{{
		Key:       v1.TaintNodeNotReady,
		Effect:    v1.TaintEffectNoExecute,
		TimeAdded: nowPointer(),
	}}

	nodeUnreachable = []v1.Taint{{
		Key:       v1.TaintNodeUnreachable,
		Effect:    v1.TaintEffectNoExecute,
		TimeAdded: nowPointer(),
	}}
)

func newDaemonSet(name string) *apps.DaemonSet {
	two := int32(2)
	return &apps.DaemonSet{
		ObjectMeta: metav1.ObjectMeta{
			UID:       uuid.NewUUID(),
			Name:      name,
			Namespace: metav1.NamespaceDefault,
		},
		Spec: apps.DaemonSetSpec{
			RevisionHistoryLimit: &two,
			UpdateStrategy: apps.DaemonSetUpdateStrategy{
				Type: apps.OnDeleteDaemonSetStrategyType,
			},
			Selector: &metav1.LabelSelector{MatchLabels: simpleDaemonSetLabel},
			Template: v1.PodTemplateSpec{
				ObjectMeta: metav1.ObjectMeta{
					Labels: simpleDaemonSetLabel,
				},
				Spec: v1.PodSpec{
					Containers: []v1.Container{
						{
							Image:                  "foo/bar",
							TerminationMessagePath: v1.TerminationMessagePathDefault,
							ImagePullPolicy:        v1.PullIfNotPresent,
							SecurityContext:        securitycontext.ValidSecurityContextWithContainerDefaults(),
						},
					},
					DNSPolicy: v1.DNSDefault,
				},
			},
		},
	}
}

func newRollbackStrategy() *apps.DaemonSetUpdateStrategy {
	one := intstr.FromInt(1)
	return &apps.DaemonSetUpdateStrategy{
		Type:          apps.RollingUpdateDaemonSetStrategyType,
		RollingUpdate: &apps.RollingUpdateDaemonSet{MaxUnavailable: &one},
	}
}

func newOnDeleteStrategy() *apps.DaemonSetUpdateStrategy {
	return &apps.DaemonSetUpdateStrategy{
		Type: apps.OnDeleteDaemonSetStrategyType,
	}
}

func updateStrategies() []*apps.DaemonSetUpdateStrategy {
	return []*apps.DaemonSetUpdateStrategy{newOnDeleteStrategy(), newRollbackStrategy()}
}

func newNode(name string, label map[string]string) *v1.Node {
	return &v1.Node{
		TypeMeta: metav1.TypeMeta{APIVersion: "v1"},
		ObjectMeta: metav1.ObjectMeta{
			Name:      name,
			Labels:    label,
			Namespace: metav1.NamespaceNone,
		},
		Status: v1.NodeStatus{
			Conditions: []v1.NodeCondition{
				{Type: v1.NodeReady, Status: v1.ConditionTrue},
			},
			Allocatable: v1.ResourceList{
				v1.ResourcePods: resource.MustParse("100"),
			},
		},
	}
}

func addNodes(nodeStore cache.Store, startIndex, numNodes int, label map[string]string) {
	for i := startIndex; i < startIndex+numNodes; i++ {
		nodeStore.Add(newNode(fmt.Sprintf("node-%d", i), label))
	}
}

func newPod(podName string, nodeName string, label map[string]string, ds *apps.DaemonSet) *v1.Pod {
	// Add hash unique label to the pod
	newLabels := label
	var podSpec v1.PodSpec
	// Copy pod spec from DaemonSet template, or use a default one if DaemonSet is nil
	if ds != nil {
		hash := controller.ComputeHash(&ds.Spec.Template, ds.Status.CollisionCount)
		newLabels = labelsutil.CloneAndAddLabel(label, apps.DefaultDaemonSetUniqueLabelKey, hash)
		podSpec = ds.Spec.Template.Spec
	} else {
		podSpec = v1.PodSpec{
			Containers: []v1.Container{
				{
					Image:                  "foo/bar",
					TerminationMessagePath: v1.TerminationMessagePathDefault,
					ImagePullPolicy:        v1.PullIfNotPresent,
					SecurityContext:        securitycontext.ValidSecurityContextWithContainerDefaults(),
				},
			},
		}
	}
	// Add node name to the pod
	if len(nodeName) > 0 {
		podSpec.NodeName = nodeName
	}

	pod := &v1.Pod{
		TypeMeta: metav1.TypeMeta{APIVersion: "v1"},
		ObjectMeta: metav1.ObjectMeta{
			GenerateName: podName,
			Labels:       newLabels,
			Namespace:    metav1.NamespaceDefault,
		},
		Spec: podSpec,
	}
	pod.Name = names.SimpleNameGenerator.GenerateName(podName)
	if ds != nil {
		pod.OwnerReferences = []metav1.OwnerReference{*metav1.NewControllerRef(ds, controllerKind)}
	}
	return pod
}

func addPods(podStore cache.Store, nodeName string, label map[string]string, ds *apps.DaemonSet, number int) {
	for i := 0; i < number; i++ {
		pod := newPod(fmt.Sprintf("%s-", nodeName), nodeName, label, ds)
		podStore.Add(pod)
	}
}

func addFailedPods(podStore cache.Store, nodeName string, label map[string]string, ds *apps.DaemonSet, number int) {
	for i := 0; i < number; i++ {
		pod := newPod(fmt.Sprintf("%s-", nodeName), nodeName, label, ds)
		pod.Status = v1.PodStatus{Phase: v1.PodFailed}
		podStore.Add(pod)
	}
}

type fakePodControl struct {
	sync.Mutex
	*controller.FakePodControl
	podStore     cache.Store
	podIDMap     map[string]*v1.Pod
	expectations controller.ControllerExpectationsInterface
	dsc          *daemonSetsController
}

func newFakePodControl() *fakePodControl {
	podIDMap := make(map[string]*v1.Pod)
	return &fakePodControl{
		FakePodControl: &controller.FakePodControl{},
		podIDMap:       podIDMap,
	}
}

func (f *fakePodControl) CreatePodsOnNode(nodeName, namespace string, template *v1.PodTemplateSpec, object runtime.Object, controllerRef *metav1.OwnerReference) error {
	f.Lock()
	defer f.Unlock()
	if err := f.FakePodControl.CreatePodsOnNode(nodeName, namespace, template, object, controllerRef); err != nil {
		return fmt.Errorf("failed to create pod on node %q", nodeName)
	}

	pod := &v1.Pod{
		ObjectMeta: metav1.ObjectMeta{
			Labels:       template.Labels,
			Namespace:    namespace,
			GenerateName: fmt.Sprintf("%s-", nodeName),
		},
	}

	if err := legacyscheme.Scheme.Convert(&template.Spec, &pod.Spec, nil); err != nil {
		return fmt.Errorf("unable to convert pod template: %v", err)
	}
	if len(nodeName) != 0 {
		pod.Spec.NodeName = nodeName
	}
	pod.Name = names.SimpleNameGenerator.GenerateName(fmt.Sprintf("%s-", nodeName))

	f.podStore.Update(pod)
	f.podIDMap[pod.Name] = pod

	ds := object.(*apps.DaemonSet)
	dsKey, _ := controller.KeyFunc(ds)
	f.expectations.CreationObserved(dsKey)

	return nil
}

func (f *fakePodControl) CreatePodsWithControllerRef(namespace string, template *v1.PodTemplateSpec, object runtime.Object, controllerRef *metav1.OwnerReference) error {
	f.Lock()
	defer f.Unlock()
	if err := f.FakePodControl.CreatePodsWithControllerRef(namespace, template, object, controllerRef); err != nil {
		return fmt.Errorf("failed to create pod for DaemonSet")
	}

	pod := &v1.Pod{
		ObjectMeta: metav1.ObjectMeta{
			Labels:    template.Labels,
			Namespace: namespace,
		},
	}

	pod.Name = names.SimpleNameGenerator.GenerateName(fmt.Sprintf("%p-", pod))

	if err := legacyscheme.Scheme.Convert(&template.Spec, &pod.Spec, nil); err != nil {
		return fmt.Errorf("unable to convert pod template: %v", err)
	}

	f.podStore.Update(pod)
	f.podIDMap[pod.Name] = pod

	ds := object.(*apps.DaemonSet)
	dsKey, _ := controller.KeyFunc(ds)
	f.expectations.CreationObserved(dsKey)

	return nil
}

func (f *fakePodControl) DeletePod(namespace string, podID string, object runtime.Object) error {
	f.Lock()
	defer f.Unlock()
	if err := f.FakePodControl.DeletePod(namespace, podID, object); err != nil {
		return fmt.Errorf("failed to delete pod %q", podID)
	}
	pod, ok := f.podIDMap[podID]
	if !ok {
		return fmt.Errorf("pod %q does not exist", podID)
	}
	f.podStore.Delete(pod)
	delete(f.podIDMap, podID)

	ds := object.(*apps.DaemonSet)
	dsKey, _ := controller.KeyFunc(ds)
	f.expectations.DeletionObserved(dsKey)

	return nil
}

type daemonSetsController struct {
	*DaemonSetsController

	dsStore      cache.Store
	historyStore cache.Store
	podStore     cache.Store
	nodeStore    cache.Store
	fakeRecorder *record.FakeRecorder
}

func newTestController(initialObjects ...runtime.Object) (*daemonSetsController, *fakePodControl, *fake.Clientset, error) {
	clientset := fake.NewSimpleClientset(initialObjects...)
	informerFactory := informers.NewSharedInformerFactory(clientset, controller.NoResyncPeriodFunc())

	dsc, err := NewDaemonSetsController(
		informerFactory.Apps().V1().DaemonSets(),
		informerFactory.Apps().V1().ControllerRevisions(),
		informerFactory.Core().V1().Pods(),
		informerFactory.Core().V1().Nodes(),
		clientset,
		flowcontrol.NewFakeBackOff(50*time.Millisecond, 500*time.Millisecond, clock.NewFakeClock(time.Now())),
	)
	if err != nil {
		return nil, nil, nil, err
	}

	fakeRecorder := record.NewFakeRecorder(100)
	dsc.eventRecorder = fakeRecorder

	dsc.podStoreSynced = alwaysReady
	dsc.nodeStoreSynced = alwaysReady
	dsc.dsStoreSynced = alwaysReady
	dsc.historyStoreSynced = alwaysReady
	podControl := newFakePodControl()
	dsc.podControl = podControl
	podControl.podStore = informerFactory.Core().V1().Pods().Informer().GetStore()

	newDsc := &daemonSetsController{
		dsc,
		informerFactory.Apps().V1().DaemonSets().Informer().GetStore(),
		informerFactory.Apps().V1().ControllerRevisions().Informer().GetStore(),
		informerFactory.Core().V1().Pods().Informer().GetStore(),
		informerFactory.Core().V1().Nodes().Informer().GetStore(),
		fakeRecorder,
	}

	podControl.expectations = newDsc.expectations

	return newDsc, podControl, clientset, nil
}

func resetCounters(manager *daemonSetsController) {
	manager.podControl.(*fakePodControl).Clear()
	fakeRecorder := record.NewFakeRecorder(100)
	manager.eventRecorder = fakeRecorder
	manager.fakeRecorder = fakeRecorder
}

func validateSyncDaemonSets(t *testing.T, manager *daemonSetsController, fakePodControl *fakePodControl, expectedCreates, expectedDeletes int, expectedEvents int) {
	if len(fakePodControl.Templates) != expectedCreates {
		t.Errorf("Unexpected number of creates.  Expected %d, saw %d\n", expectedCreates, len(fakePodControl.Templates))
	}
	if len(fakePodControl.DeletePodName) != expectedDeletes {
		t.Errorf("Unexpected number of deletes.  Expected %d, saw %d\n", expectedDeletes, len(fakePodControl.DeletePodName))
	}
	if len(manager.fakeRecorder.Events) != expectedEvents {
		t.Errorf("Unexpected number of events.  Expected %d, saw %d\n", expectedEvents, len(manager.fakeRecorder.Events))
	}
	// Every Pod created should have a ControllerRef.
	if got, want := len(fakePodControl.ControllerRefs), expectedCreates; got != want {
		t.Errorf("len(ControllerRefs) = %v, want %v", got, want)
	}
	// Make sure the ControllerRefs are correct.
	for _, controllerRef := range fakePodControl.ControllerRefs {
		if got, want := controllerRef.APIVersion, "apps/v1"; got != want {
			t.Errorf("controllerRef.APIVersion = %q, want %q", got, want)
		}
		if got, want := controllerRef.Kind, "DaemonSet"; got != want {
			t.Errorf("controllerRef.Kind = %q, want %q", got, want)
		}
		if controllerRef.Controller == nil || *controllerRef.Controller != true {
			t.Errorf("controllerRef.Controller is not set to true")
		}
	}
}

func syncAndValidateDaemonSets(t *testing.T, manager *daemonSetsController, ds *apps.DaemonSet, podControl *fakePodControl, expectedCreates, expectedDeletes int, expectedEvents int) {
	key, err := controller.KeyFunc(ds)
	if err != nil {
		t.Errorf("Could not get key for daemon.")
	}
	manager.syncHandler(key)
	validateSyncDaemonSets(t, manager, podControl, expectedCreates, expectedDeletes, expectedEvents)
}

// clearExpectations copies the FakePodControl to PodStore and clears the create and delete expectations.
func clearExpectations(t *testing.T, manager *daemonSetsController, ds *apps.DaemonSet, fakePodControl *fakePodControl) {
	fakePodControl.Clear()

	key, err := controller.KeyFunc(ds)
	if err != nil {
		t.Errorf("Could not get key for daemon.")
		return
	}
	manager.expectations.DeleteExpectations(key)
}

func TestDeleteFinalStateUnknown(t *testing.T) {
	for _, strategy := range updateStrategies() {
		manager, _, _, err := newTestController()
		if err != nil {
			t.Fatalf("error creating DaemonSets controller: %v", err)
		}
		addNodes(manager.nodeStore, 0, 1, nil)
		ds := newDaemonSet("foo")
		ds.Spec.UpdateStrategy = *strategy
		// DeletedFinalStateUnknown should queue the embedded DS if found.
		manager.deleteDaemonset(cache.DeletedFinalStateUnknown{Key: "foo", Obj: ds})
		enqueuedKey, _ := manager.queue.Get()
		if enqueuedKey.(string) != "default/foo" {
			t.Errorf("expected delete of DeletedFinalStateUnknown to enqueue the daemonset but found: %#v", enqueuedKey)
		}
	}
}

func markPodsReady(store cache.Store) {
	// mark pods as ready
	for _, obj := range store.List() {
		pod := obj.(*v1.Pod)
		markPodReady(pod)
	}
}

func markPodReady(pod *v1.Pod) {
	condition := v1.PodCondition{Type: v1.PodReady, Status: v1.ConditionTrue}
	podutil.UpdatePodCondition(&pod.Status, &condition)
}

// DaemonSets without node selectors should launch pods on every node.
func TestSimpleDaemonSetLaunchesPods(t *testing.T) {
	for _, strategy := range updateStrategies() {
		ds := newDaemonSet("foo")
		ds.Spec.UpdateStrategy = *strategy
		manager, podControl, _, err := newTestController(ds)
		if err != nil {
			t.Fatalf("error creating DaemonSets controller: %v", err)
		}
		addNodes(manager.nodeStore, 0, 5, nil)
		manager.dsStore.Add(ds)
		syncAndValidateDaemonSets(t, manager, ds, podControl, 5, 0, 0)
	}
}

// DaemonSets without node selectors should launch pods on every node by NodeAffinity.
func TestSimpleDaemonSetScheduleDaemonSetPodsLaunchesPods(t *testing.T) {
	nodeNum := 5
	for _, strategy := range updateStrategies() {
		ds := newDaemonSet("foo")
		ds.Spec.UpdateStrategy = *strategy
		manager, podControl, _, err := newTestController(ds)
		if err != nil {
			t.Fatalf("error creating DaemonSets controller: %v", err)
		}
		addNodes(manager.nodeStore, 0, nodeNum, nil)
		manager.dsStore.Add(ds)
		syncAndValidateDaemonSets(t, manager, ds, podControl, nodeNum, 0, 0)

		if len(podControl.podIDMap) != nodeNum {
			t.Fatalf("failed to create pods for DaemonSet")
		}

		nodeMap := make(map[string]*v1.Node)
		for _, node := range manager.nodeStore.List() {
			n := node.(*v1.Node)
			nodeMap[n.Name] = n
		}
		if len(nodeMap) != nodeNum {
			t.Fatalf("not enough nodes in the store, expected: %v, got: %v",
				nodeNum, len(nodeMap))
		}

		for _, pod := range podControl.podIDMap {
			if len(pod.Spec.NodeName) != 0 {
				t.Fatalf("the hostname of pod %v should be empty, but got %s",
					pod.Name, pod.Spec.NodeName)
			}
			if pod.Spec.Affinity == nil {
				t.Fatalf("the Affinity of pod %s is nil.", pod.Name)
			}
			if pod.Spec.Affinity.NodeAffinity == nil {
				t.Fatalf("the NodeAffinity of pod %s is nil.", pod.Name)
			}
			nodeSelector := pod.Spec.Affinity.NodeAffinity.RequiredDuringSchedulingIgnoredDuringExecution
			if nodeSelector == nil {
				t.Fatalf("the node selector of pod %s is nil.", pod.Name)
			}
			if len(nodeSelector.NodeSelectorTerms) != 1 {
				t.Fatalf("incorrect number of node selector terms in pod %s, expected: 1, got: %d.",
					pod.Name, len(nodeSelector.NodeSelectorTerms))
			}

			if len(nodeSelector.NodeSelectorTerms[0].MatchFields) != 1 {
				t.Fatalf("incorrect number of fields in node selector term for pod %s, expected: 1, got: %d.",
					pod.Name, len(nodeSelector.NodeSelectorTerms[0].MatchFields))
			}

			field := nodeSelector.NodeSelectorTerms[0].MatchFields[0]
			if field.Key == api.ObjectNameField {
				if field.Operator != v1.NodeSelectorOpIn {
					t.Fatalf("the operation of hostname NodeAffinity is not %v", v1.NodeSelectorOpIn)
				}

				if len(field.Values) != 1 {
					t.Fatalf("incorrect hostname in node affinity: expected 1, got %v", len(field.Values))
				}
				delete(nodeMap, field.Values[0])
			}
		}

		if len(nodeMap) != 0 {
			t.Fatalf("did not foud pods on nodes %+v", nodeMap)
		}
	}

}

// Simulate a cluster with 100 nodes, but simulate a limit (like a quota limit)
// of 10 pods, and verify that the ds doesn't make 100 create calls per sync pass
func TestSimpleDaemonSetPodCreateErrors(t *testing.T) {
	for _, strategy := range updateStrategies() {
		ds := newDaemonSet("foo")
		ds.Spec.UpdateStrategy = *strategy
		manager, podControl, _, err := newTestController(ds)
		if err != nil {
			t.Fatalf("error creating DaemonSets controller: %v", err)
		}
		podControl.FakePodControl.CreateLimit = 10
		addNodes(manager.nodeStore, 0, podControl.FakePodControl.CreateLimit*10, nil)
		manager.dsStore.Add(ds)
		syncAndValidateDaemonSets(t, manager, ds, podControl, podControl.FakePodControl.CreateLimit, 0, 0)
		expectedLimit := 0
		for pass := uint8(0); expectedLimit <= podControl.FakePodControl.CreateLimit; pass++ {
			expectedLimit += controller.SlowStartInitialBatchSize << pass
		}
		if podControl.FakePodControl.CreateCallCount > expectedLimit {
			t.Errorf("Unexpected number of create calls.  Expected <= %d, saw %d\n", podControl.FakePodControl.CreateLimit*2, podControl.FakePodControl.CreateCallCount)
		}
	}
}

func TestDaemonSetPodCreateExpectationsError(t *testing.T) {
	strategies := updateStrategies()
	for _, strategy := range strategies {
		ds := newDaemonSet("foo")
		ds.Spec.UpdateStrategy = *strategy
		manager, podControl, _, err := newTestController(ds)
		if err != nil {
			t.Fatalf("error creating DaemonSets controller: %v", err)
		}
		podControl.FakePodControl.CreateLimit = 10
		creationExpectations := 100
		addNodes(manager.nodeStore, 0, 100, nil)
		manager.dsStore.Add(ds)
		syncAndValidateDaemonSets(t, manager, ds, podControl, podControl.FakePodControl.CreateLimit, 0, 0)
		dsKey, err := controller.KeyFunc(ds)
		if err != nil {
			t.Fatalf("error get DaemonSets controller key: %v", err)
		}

		if !manager.expectations.SatisfiedExpectations(dsKey) {
			t.Errorf("Unsatisfied pod creation expectatitons. Expected %d", creationExpectations)
		}
	}
}

func TestSimpleDaemonSetUpdatesStatusAfterLaunchingPods(t *testing.T) {
	for _, strategy := range updateStrategies() {
		ds := newDaemonSet("foo")
		ds.Spec.UpdateStrategy = *strategy
		manager, podControl, clientset, err := newTestController(ds)
		if err != nil {
			t.Fatalf("error creating DaemonSets controller: %v", err)
		}

		var updated *apps.DaemonSet
		clientset.PrependReactor("update", "daemonsets", func(action core.Action) (handled bool, ret runtime.Object, err error) {
			if action.GetSubresource() != "status" {
				return false, nil, nil
			}
			if u, ok := action.(core.UpdateAction); ok {
				updated = u.GetObject().(*apps.DaemonSet)
			}
			return false, nil, nil
		})

		manager.dsStore.Add(ds)
		addNodes(manager.nodeStore, 0, 5, nil)
		syncAndValidateDaemonSets(t, manager, ds, podControl, 5, 0, 0)

		// Make sure the single sync() updated Status already for the change made
		// during the manage() phase.
		if got, want := updated.Status.CurrentNumberScheduled, int32(5); got != want {
			t.Errorf("Status.CurrentNumberScheduled = %v, want %v", got, want)
		}
	}
}

// DaemonSets should do nothing if there aren't any nodes
func TestNoNodesDoesNothing(t *testing.T) {
	for _, strategy := range updateStrategies() {
		manager, podControl, _, err := newTestController()
		if err != nil {
			t.Fatalf("error creating DaemonSets controller: %v", err)
		}
		ds := newDaemonSet("foo")
		ds.Spec.UpdateStrategy = *strategy
		manager.dsStore.Add(ds)
		syncAndValidateDaemonSets(t, manager, ds, podControl, 0, 0, 0)
	}
}

// DaemonSets without node selectors should launch on a single node in a
// single node cluster.
func TestOneNodeDaemonLaunchesPod(t *testing.T) {
	for _, strategy := range updateStrategies() {
		ds := newDaemonSet("foo")
		ds.Spec.UpdateStrategy = *strategy
		manager, podControl, _, err := newTestController(ds)
		if err != nil {
			t.Fatalf("error creating DaemonSets controller: %v", err)
		}
		manager.nodeStore.Add(newNode("only-node", nil))
		manager.dsStore.Add(ds)
		syncAndValidateDaemonSets(t, manager, ds, podControl, 1, 0, 0)
	}
}

// DaemonSets should place onto NotReady nodes
func TestNotReadyNodeDaemonDoesLaunchPod(t *testing.T) {
	for _, strategy := range updateStrategies() {
		ds := newDaemonSet("foo")
		ds.Spec.UpdateStrategy = *strategy
		manager, podControl, _, err := newTestController(ds)
		if err != nil {
			t.Fatalf("error creating DaemonSets controller: %v", err)
		}
		node := newNode("not-ready", nil)
		node.Status.Conditions = []v1.NodeCondition{
			{Type: v1.NodeReady, Status: v1.ConditionFalse},
		}
		manager.nodeStore.Add(node)
		manager.dsStore.Add(ds)
		syncAndValidateDaemonSets(t, manager, ds, podControl, 1, 0, 0)
	}
}

func resourcePodSpec(nodeName, memory, cpu string) v1.PodSpec {
	return v1.PodSpec{
		NodeName: nodeName,
		Containers: []v1.Container{{
			Resources: v1.ResourceRequirements{
				Requests: allocatableResources(memory, cpu),
			},
		}},
	}
}

func resourceContainerSpec(memory, cpu string) v1.ResourceRequirements {
	return v1.ResourceRequirements{
		Requests: allocatableResources(memory, cpu),
	}
}

func resourcePodSpecWithoutNodeName(memory, cpu string) v1.PodSpec {
	return v1.PodSpec{
		Containers: []v1.Container{{
			Resources: v1.ResourceRequirements{
				Requests: allocatableResources(memory, cpu),
			},
		}},
	}
}

func allocatableResources(memory, cpu string) v1.ResourceList {
	return v1.ResourceList{
		v1.ResourceMemory: resource.MustParse(memory),
		v1.ResourceCPU:    resource.MustParse(cpu),
		v1.ResourcePods:   resource.MustParse("100"),
	}
}

// DaemonSets should not unschedule a daemonset pod from a node with insufficient free resource
func TestInsufficientCapacityNodeDaemonDoesNotUnscheduleRunningPod(t *testing.T) {
	for _, strategy := range updateStrategies() {
		podSpec := resourcePodSpec("too-much-mem", "75M", "75m")
		podSpec.NodeName = "too-much-mem"
		ds := newDaemonSet("foo")
		ds.Spec.UpdateStrategy = *strategy
		ds.Spec.Template.Spec = podSpec
		manager, podControl, _, err := newTestController(ds)
		if err != nil {
			t.Fatalf("error creating DaemonSets controller: %v", err)
		}
		node := newNode("too-much-mem", nil)
		node.Status.Allocatable = allocatableResources("100M", "200m")
		manager.nodeStore.Add(node)
		manager.podStore.Add(&v1.Pod{
			Spec: podSpec,
		})
		manager.dsStore.Add(ds)
		switch strategy.Type {
		case apps.OnDeleteDaemonSetStrategyType:
			syncAndValidateDaemonSets(t, manager, ds, podControl, 1, 0, 0)
		case apps.RollingUpdateDaemonSetStrategyType:
			syncAndValidateDaemonSets(t, manager, ds, podControl, 1, 0, 0)
		default:
			t.Fatalf("unexpected UpdateStrategy %+v", strategy)
		}
	}
}

// DaemonSets should only place onto nodes with sufficient free resource and matched node selector
func TestInsufficientCapacityNodeSufficientCapacityWithNodeLabelDaemonLaunchPod(t *testing.T) {
	podSpec := resourcePodSpecWithoutNodeName("50M", "75m")
	ds := newDaemonSet("foo")
	ds.Spec.Template.Spec = podSpec
	ds.Spec.Template.Spec.NodeSelector = simpleNodeLabel
	manager, podControl, _, err := newTestController(ds)
	if err != nil {
		t.Fatalf("error creating DaemonSets controller: %v", err)
	}
	node1 := newNode("not-enough-resource", nil)
	node1.Status.Allocatable = allocatableResources("10M", "20m")
	node2 := newNode("enough-resource", simpleNodeLabel)
	node2.Status.Allocatable = allocatableResources("100M", "200m")
	manager.nodeStore.Add(node1)
	manager.nodeStore.Add(node2)
	manager.dsStore.Add(ds)
	syncAndValidateDaemonSets(t, manager, ds, podControl, 1, 0, 0)
	// we do not expect any event for insufficient free resource
	if len(manager.fakeRecorder.Events) != 0 {
		t.Fatalf("unexpected events, got %v, expected %v: %+v", len(manager.fakeRecorder.Events), 0, manager.fakeRecorder.Events)
	}
}

// DaemonSet should launch a pod on a node with taint NetworkUnavailable condition.
func TestNetworkUnavailableNodeDaemonLaunchesPod(t *testing.T) {
	for _, strategy := range updateStrategies() {
		ds := newDaemonSet("simple")
		ds.Spec.UpdateStrategy = *strategy
		manager, podControl, _, err := newTestController(ds)
		if err != nil {
			t.Fatalf("error creating DaemonSets controller: %v", err)
		}

		node := newNode("network-unavailable", nil)
		node.Status.Conditions = []v1.NodeCondition{
			{Type: v1.NodeNetworkUnavailable, Status: v1.ConditionTrue},
		}
		manager.nodeStore.Add(node)
		manager.dsStore.Add(ds)

		syncAndValidateDaemonSets(t, manager, ds, podControl, 1, 0, 0)
	}
}

// DaemonSets not take any actions when being deleted
func TestDontDoAnythingIfBeingDeleted(t *testing.T) {
	for _, strategy := range updateStrategies() {
		podSpec := resourcePodSpec("not-too-much-mem", "75M", "75m")
		ds := newDaemonSet("foo")
		ds.Spec.UpdateStrategy = *strategy
		ds.Spec.Template.Spec = podSpec
		now := metav1.Now()
		ds.DeletionTimestamp = &now
		manager, podControl, _, err := newTestController(ds)
		if err != nil {
			t.Fatalf("error creating DaemonSets controller: %v", err)
		}
		node := newNode("not-too-much-mem", nil)
		node.Status.Allocatable = allocatableResources("200M", "200m")
		manager.nodeStore.Add(node)
		manager.podStore.Add(&v1.Pod{
			Spec: podSpec,
		})
		manager.dsStore.Add(ds)
		syncAndValidateDaemonSets(t, manager, ds, podControl, 0, 0, 0)
	}
}

func TestDontDoAnythingIfBeingDeletedRace(t *testing.T) {
	for _, strategy := range updateStrategies() {
		// Bare client says it IS deleted.
		ds := newDaemonSet("foo")
		ds.Spec.UpdateStrategy = *strategy
		now := metav1.Now()
		ds.DeletionTimestamp = &now
		manager, podControl, _, err := newTestController(ds)
		if err != nil {
			t.Fatalf("error creating DaemonSets controller: %v", err)
		}
		addNodes(manager.nodeStore, 0, 5, nil)

		// Lister (cache) says it's NOT deleted.
		ds2 := *ds
		ds2.DeletionTimestamp = nil
		manager.dsStore.Add(&ds2)

		// The existence of a matching orphan should block all actions in this state.
		pod := newPod("pod1-", "node-0", simpleDaemonSetLabel, nil)
		manager.podStore.Add(pod)

		syncAndValidateDaemonSets(t, manager, ds, podControl, 0, 0, 0)
	}
}

// Test that if the node is already scheduled with a pod using a host port
// but belonging to the same daemonset, we don't delete that pod
//
// Issue: https://github.com/kubernetes/kubernetes/issues/22309
func TestPortConflictWithSameDaemonPodDoesNotDeletePod(t *testing.T) {
	for _, strategy := range updateStrategies() {
		podSpec := v1.PodSpec{
			NodeName: "port-conflict",
			Containers: []v1.Container{{
				Ports: []v1.ContainerPort{{
					HostPort: 666,
				}},
			}},
		}
		manager, podControl, _, err := newTestController()
		if err != nil {
			t.Fatalf("error creating DaemonSets controller: %v", err)
		}
		node := newNode("port-conflict", nil)
		manager.nodeStore.Add(node)
		ds := newDaemonSet("foo")
		ds.Spec.UpdateStrategy = *strategy
		ds.Spec.Template.Spec = podSpec
		manager.dsStore.Add(ds)
		pod := newPod(ds.Name+"-", node.Name, simpleDaemonSetLabel, ds)
		manager.podStore.Add(pod)
		syncAndValidateDaemonSets(t, manager, ds, podControl, 0, 0, 0)
	}
}

// DaemonSets should place onto nodes that would not cause port conflicts
func TestNoPortConflictNodeDaemonLaunchesPod(t *testing.T) {
	for _, strategy := range updateStrategies() {
		podSpec1 := v1.PodSpec{
			NodeName: "no-port-conflict",
			Containers: []v1.Container{{
				Ports: []v1.ContainerPort{{
					HostPort: 6661,
				}},
			}},
		}
		podSpec2 := v1.PodSpec{
			NodeName: "no-port-conflict",
			Containers: []v1.Container{{
				Ports: []v1.ContainerPort{{
					HostPort: 6662,
				}},
			}},
		}
		ds := newDaemonSet("foo")
		ds.Spec.UpdateStrategy = *strategy
		ds.Spec.Template.Spec = podSpec2
		manager, podControl, _, err := newTestController(ds)
		if err != nil {
			t.Fatalf("error creating DaemonSets controller: %v", err)
		}
		node := newNode("no-port-conflict", nil)
		manager.nodeStore.Add(node)
		manager.podStore.Add(&v1.Pod{
			Spec: podSpec1,
		})
		manager.dsStore.Add(ds)
		syncAndValidateDaemonSets(t, manager, ds, podControl, 1, 0, 0)
	}
}

// DaemonSetController should not sync DaemonSets with empty pod selectors.
//
// issue https://github.com/kubernetes/kubernetes/pull/23223
func TestPodIsNotDeletedByDaemonsetWithEmptyLabelSelector(t *testing.T) {
	// Create a misconfigured DaemonSet. An empty pod selector is invalid but could happen
	// if we upgrade and make a backwards incompatible change.
	//
	// The node selector matches no nodes which mimics the behavior of kubectl delete.
	//
	// The DaemonSet should not schedule pods and should not delete scheduled pods in
	// this case even though it's empty pod selector matches all pods. The DaemonSetController
	// should detect this misconfiguration and choose not to sync the DaemonSet. We should
	// not observe a deletion of the pod on node1.
	for _, strategy := range updateStrategies() {
		ds := newDaemonSet("foo")
		ds.Spec.UpdateStrategy = *strategy
		ls := metav1.LabelSelector{}
		ds.Spec.Selector = &ls
		ds.Spec.Template.Spec.NodeSelector = map[string]string{"foo": "bar"}

		manager, podControl, _, err := newTestController(ds)
		if err != nil {
			t.Fatalf("error creating DaemonSets controller: %v", err)
		}
		manager.nodeStore.Add(newNode("node1", nil))
		// Create pod not controlled by a daemonset.
		manager.podStore.Add(&v1.Pod{
			ObjectMeta: metav1.ObjectMeta{
				Labels:    map[string]string{"bang": "boom"},
				Namespace: metav1.NamespaceDefault,
			},
			Spec: v1.PodSpec{
				NodeName: "node1",
			},
		})
		manager.dsStore.Add(ds)

		syncAndValidateDaemonSets(t, manager, ds, podControl, 0, 0, 1)
	}
}

// Controller should not create pods on nodes which have daemon pods, and should remove excess pods from nodes that have extra pods.
func TestDealsWithExistingPods(t *testing.T) {
	for _, strategy := range updateStrategies() {
		ds := newDaemonSet("foo")
		ds.Spec.UpdateStrategy = *strategy
		manager, podControl, _, err := newTestController(ds)
		if err != nil {
			t.Fatalf("error creating DaemonSets controller: %v", err)
		}
		manager.dsStore.Add(ds)
		addNodes(manager.nodeStore, 0, 5, nil)
		addPods(manager.podStore, "node-1", simpleDaemonSetLabel, ds, 1)
		addPods(manager.podStore, "node-2", simpleDaemonSetLabel, ds, 2)
		addPods(manager.podStore, "node-3", simpleDaemonSetLabel, ds, 5)
		addPods(manager.podStore, "node-4", simpleDaemonSetLabel2, ds, 2)
		syncAndValidateDaemonSets(t, manager, ds, podControl, 2, 5, 0)
	}
}

// Daemon with node selector should launch pods on nodes matching selector.
func TestSelectorDaemonLaunchesPods(t *testing.T) {
	for _, strategy := range updateStrategies() {
		daemon := newDaemonSet("foo")
		daemon.Spec.UpdateStrategy = *strategy
		daemon.Spec.Template.Spec.NodeSelector = simpleNodeLabel
		manager, podControl, _, err := newTestController(daemon)
		if err != nil {
			t.Fatalf("error creating DaemonSets controller: %v", err)
		}
		addNodes(manager.nodeStore, 0, 4, nil)
		addNodes(manager.nodeStore, 4, 3, simpleNodeLabel)
		manager.dsStore.Add(daemon)
		syncAndValidateDaemonSets(t, manager, daemon, podControl, 3, 0, 0)
	}
}

// Daemon with node selector should delete pods from nodes that do not satisfy selector.
func TestSelectorDaemonDeletesUnselectedPods(t *testing.T) {
	for _, strategy := range updateStrategies() {
		ds := newDaemonSet("foo")
		ds.Spec.UpdateStrategy = *strategy
		ds.Spec.Template.Spec.NodeSelector = simpleNodeLabel
		manager, podControl, _, err := newTestController(ds)
		if err != nil {
			t.Fatalf("error creating DaemonSets controller: %v", err)
		}
		manager.dsStore.Add(ds)
		addNodes(manager.nodeStore, 0, 5, nil)
		addNodes(manager.nodeStore, 5, 5, simpleNodeLabel)
		addPods(manager.podStore, "node-0", simpleDaemonSetLabel2, ds, 2)
		addPods(manager.podStore, "node-1", simpleDaemonSetLabel, ds, 3)
		addPods(manager.podStore, "node-1", simpleDaemonSetLabel2, ds, 1)
		addPods(manager.podStore, "node-4", simpleDaemonSetLabel, ds, 1)
		syncAndValidateDaemonSets(t, manager, ds, podControl, 5, 4, 0)
	}
}

// DaemonSet with node selector should launch pods on nodes matching selector, but also deal with existing pods on nodes.
func TestSelectorDaemonDealsWithExistingPods(t *testing.T) {
	for _, strategy := range updateStrategies() {
		ds := newDaemonSet("foo")
		ds.Spec.UpdateStrategy = *strategy
		ds.Spec.Template.Spec.NodeSelector = simpleNodeLabel
		manager, podControl, _, err := newTestController(ds)
		if err != nil {
			t.Fatalf("error creating DaemonSets controller: %v", err)
		}
		manager.dsStore.Add(ds)
		addNodes(manager.nodeStore, 0, 5, nil)
		addNodes(manager.nodeStore, 5, 5, simpleNodeLabel)
		addPods(manager.podStore, "node-0", simpleDaemonSetLabel, ds, 1)
		addPods(manager.podStore, "node-1", simpleDaemonSetLabel, ds, 3)
		addPods(manager.podStore, "node-1", simpleDaemonSetLabel2, ds, 2)
		addPods(manager.podStore, "node-2", simpleDaemonSetLabel, ds, 4)
		addPods(manager.podStore, "node-6", simpleDaemonSetLabel, ds, 13)
		addPods(manager.podStore, "node-7", simpleDaemonSetLabel2, ds, 4)
		addPods(manager.podStore, "node-9", simpleDaemonSetLabel, ds, 1)
		addPods(manager.podStore, "node-9", simpleDaemonSetLabel2, ds, 1)
		syncAndValidateDaemonSets(t, manager, ds, podControl, 3, 20, 0)
	}
}

// DaemonSet with node selector which does not match any node labels should not launch pods.
func TestBadSelectorDaemonDoesNothing(t *testing.T) {
	for _, strategy := range updateStrategies() {
		manager, podControl, _, err := newTestController()
		if err != nil {
			t.Fatalf("error creating DaemonSets controller: %v", err)
		}
		addNodes(manager.nodeStore, 0, 4, nil)
		addNodes(manager.nodeStore, 4, 3, simpleNodeLabel)
		ds := newDaemonSet("foo")
		ds.Spec.UpdateStrategy = *strategy
		ds.Spec.Template.Spec.NodeSelector = simpleNodeLabel2
		manager.dsStore.Add(ds)
		syncAndValidateDaemonSets(t, manager, ds, podControl, 0, 0, 0)
	}
}

// DaemonSet with node name should launch pod on node with corresponding name.
func TestNameDaemonSetLaunchesPods(t *testing.T) {
	for _, strategy := range updateStrategies() {
		ds := newDaemonSet("foo")
		ds.Spec.UpdateStrategy = *strategy
		ds.Spec.Template.Spec.NodeName = "node-0"
		manager, podControl, _, err := newTestController(ds)
		if err != nil {
			t.Fatalf("error creating DaemonSets controller: %v", err)
		}
		addNodes(manager.nodeStore, 0, 5, nil)
		manager.dsStore.Add(ds)
		syncAndValidateDaemonSets(t, manager, ds, podControl, 1, 0, 0)
	}
}

// DaemonSet with node name that does not exist should not launch pods.
func TestBadNameDaemonSetDoesNothing(t *testing.T) {
	for _, strategy := range updateStrategies() {
		ds := newDaemonSet("foo")
		ds.Spec.UpdateStrategy = *strategy
		ds.Spec.Template.Spec.NodeName = "node-10"
		manager, podControl, _, err := newTestController(ds)
		if err != nil {
			t.Fatalf("error creating DaemonSets controller: %v", err)
		}
		addNodes(manager.nodeStore, 0, 5, nil)
		manager.dsStore.Add(ds)
		syncAndValidateDaemonSets(t, manager, ds, podControl, 0, 0, 0)
	}
}

// DaemonSet with node selector, and node name, matching a node, should launch a pod on the node.
func TestNameAndSelectorDaemonSetLaunchesPods(t *testing.T) {
	for _, strategy := range updateStrategies() {
		ds := newDaemonSet("foo")
		ds.Spec.UpdateStrategy = *strategy
		ds.Spec.Template.Spec.NodeSelector = simpleNodeLabel
		ds.Spec.Template.Spec.NodeName = "node-6"
		manager, podControl, _, err := newTestController(ds)
		if err != nil {
			t.Fatalf("error creating DaemonSets controller: %v", err)
		}
		addNodes(manager.nodeStore, 0, 4, nil)
		addNodes(manager.nodeStore, 4, 3, simpleNodeLabel)
		manager.dsStore.Add(ds)
		syncAndValidateDaemonSets(t, manager, ds, podControl, 1, 0, 0)
	}
}

// DaemonSet with node selector that matches some nodes, and node name that matches a different node, should do nothing.
func TestInconsistentNameSelectorDaemonSetDoesNothing(t *testing.T) {
	for _, strategy := range updateStrategies() {
		ds := newDaemonSet("foo")
		ds.Spec.UpdateStrategy = *strategy
		ds.Spec.Template.Spec.NodeSelector = simpleNodeLabel
		ds.Spec.Template.Spec.NodeName = "node-0"
		manager, podControl, _, err := newTestController(ds)
		if err != nil {
			t.Fatalf("error creating DaemonSets controller: %v", err)
		}
		addNodes(manager.nodeStore, 0, 4, nil)
		addNodes(manager.nodeStore, 4, 3, simpleNodeLabel)
		manager.dsStore.Add(ds)
		syncAndValidateDaemonSets(t, manager, ds, podControl, 0, 0, 0)
	}
}

// DaemonSet with node selector, matching some nodes, should launch pods on all the nodes.
func TestSelectorDaemonSetLaunchesPods(t *testing.T) {
	ds := newDaemonSet("foo")
	ds.Spec.Template.Spec.NodeSelector = simpleNodeLabel
	manager, podControl, _, err := newTestController(ds)
	if err != nil {
		t.Fatalf("error creating DaemonSets controller: %v", err)
	}
	addNodes(manager.nodeStore, 0, 4, nil)
	addNodes(manager.nodeStore, 4, 3, simpleNodeLabel)
	manager.dsStore.Add(ds)
	syncAndValidateDaemonSets(t, manager, ds, podControl, 3, 0, 0)
}

// Daemon with node affinity should launch pods on nodes matching affinity.
func TestNodeAffinityDaemonLaunchesPods(t *testing.T) {
	for _, strategy := range updateStrategies() {
		daemon := newDaemonSet("foo")
		daemon.Spec.UpdateStrategy = *strategy
		daemon.Spec.Template.Spec.Affinity = &v1.Affinity{
			NodeAffinity: &v1.NodeAffinity{
				RequiredDuringSchedulingIgnoredDuringExecution: &v1.NodeSelector{
					NodeSelectorTerms: []v1.NodeSelectorTerm{
						{
							MatchExpressions: []v1.NodeSelectorRequirement{
								{
									Key:      "color",
									Operator: v1.NodeSelectorOpIn,
									Values:   []string{simpleNodeLabel["color"]},
								},
							},
						},
					},
				},
			},
		}

		manager, podControl, _, err := newTestController(daemon)
		if err != nil {
			t.Fatalf("rrror creating DaemonSetsController: %v", err)
		}
		addNodes(manager.nodeStore, 0, 4, nil)
		addNodes(manager.nodeStore, 4, 3, simpleNodeLabel)
		manager.dsStore.Add(daemon)
		syncAndValidateDaemonSets(t, manager, daemon, podControl, 3, 0, 0)
	}
}

func TestNumberReadyStatus(t *testing.T) {
	for _, strategy := range updateStrategies() {
		ds := newDaemonSet("foo")
		ds.Spec.UpdateStrategy = *strategy
		manager, podControl, clientset, err := newTestController(ds)
		if err != nil {
			t.Fatalf("error creating DaemonSets controller: %v", err)
		}
		var updated *apps.DaemonSet
		clientset.PrependReactor("update", "daemonsets", func(action core.Action) (handled bool, ret runtime.Object, err error) {
			if action.GetSubresource() != "status" {
				return false, nil, nil
			}
			if u, ok := action.(core.UpdateAction); ok {
				updated = u.GetObject().(*apps.DaemonSet)
			}
			return false, nil, nil
		})
		addNodes(manager.nodeStore, 0, 2, simpleNodeLabel)
		addPods(manager.podStore, "node-0", simpleDaemonSetLabel, ds, 1)
		addPods(manager.podStore, "node-1", simpleDaemonSetLabel, ds, 1)
		manager.dsStore.Add(ds)

		syncAndValidateDaemonSets(t, manager, ds, podControl, 0, 0, 0)
		if updated.Status.NumberReady != 0 {
			t.Errorf("Wrong daemon %s status: %v", updated.Name, updated.Status)
		}

		selector, _ := metav1.LabelSelectorAsSelector(ds.Spec.Selector)
		daemonPods, _ := manager.podLister.Pods(ds.Namespace).List(selector)
		for _, pod := range daemonPods {
			condition := v1.PodCondition{Type: v1.PodReady, Status: v1.ConditionTrue}
			pod.Status.Conditions = append(pod.Status.Conditions, condition)
		}

		syncAndValidateDaemonSets(t, manager, ds, podControl, 0, 0, 0)
		if updated.Status.NumberReady != 2 {
			t.Errorf("Wrong daemon %s status: %v", updated.Name, updated.Status)
		}
	}
}

func TestObservedGeneration(t *testing.T) {
	for _, strategy := range updateStrategies() {
		ds := newDaemonSet("foo")
		ds.Spec.UpdateStrategy = *strategy
		ds.Generation = 1
		manager, podControl, clientset, err := newTestController(ds)
		if err != nil {
			t.Fatalf("error creating DaemonSets controller: %v", err)
		}
		var updated *apps.DaemonSet
		clientset.PrependReactor("update", "daemonsets", func(action core.Action) (handled bool, ret runtime.Object, err error) {
			if action.GetSubresource() != "status" {
				return false, nil, nil
			}
			if u, ok := action.(core.UpdateAction); ok {
				updated = u.GetObject().(*apps.DaemonSet)
			}
			return false, nil, nil
		})

		addNodes(manager.nodeStore, 0, 1, simpleNodeLabel)
		addPods(manager.podStore, "node-0", simpleDaemonSetLabel, ds, 1)
		manager.dsStore.Add(ds)

		syncAndValidateDaemonSets(t, manager, ds, podControl, 0, 0, 0)
		if updated.Status.ObservedGeneration != ds.Generation {
			t.Errorf("Wrong ObservedGeneration for daemon %s in status. Expected %d, got %d", updated.Name, ds.Generation, updated.Status.ObservedGeneration)
		}
	}
}

// DaemonSet controller should kill all failed pods and create at most 1 pod on every node.
func TestDaemonKillFailedPods(t *testing.T) {
	tests := []struct {
		numFailedPods, numNormalPods, expectedCreates, expectedDeletes, expectedEvents int
		test                                                                           string
	}{
		{numFailedPods: 0, numNormalPods: 1, expectedCreates: 0, expectedDeletes: 0, expectedEvents: 0, test: "normal (do nothing)"},
		{numFailedPods: 0, numNormalPods: 0, expectedCreates: 1, expectedDeletes: 0, expectedEvents: 0, test: "no pods (create 1)"},
		{numFailedPods: 1, numNormalPods: 0, expectedCreates: 0, expectedDeletes: 1, expectedEvents: 1, test: "1 failed pod (kill 1), 0 normal pod (create 0; will create in the next sync)"},
		{numFailedPods: 1, numNormalPods: 3, expectedCreates: 0, expectedDeletes: 3, expectedEvents: 1, test: "1 failed pod (kill 1), 3 normal pods (kill 2)"},
	}

	for _, test := range tests {
		t.Run(test.test, func(t *testing.T) {
			for _, strategy := range updateStrategies() {
				ds := newDaemonSet("foo")
				ds.Spec.UpdateStrategy = *strategy
				manager, podControl, _, err := newTestController(ds)
				if err != nil {
					t.Fatalf("error creating DaemonSets controller: %v", err)
				}
				manager.dsStore.Add(ds)
				addNodes(manager.nodeStore, 0, 1, nil)
				addFailedPods(manager.podStore, "node-0", simpleDaemonSetLabel, ds, test.numFailedPods)
				addPods(manager.podStore, "node-0", simpleDaemonSetLabel, ds, test.numNormalPods)
				syncAndValidateDaemonSets(t, manager, ds, podControl, test.expectedCreates, test.expectedDeletes, test.expectedEvents)
			}
		})
	}
}

// DaemonSet controller needs to backoff when killing failed pods to avoid hot looping and fighting with kubelet.
func TestDaemonKillFailedPodsBackoff(t *testing.T) {
	for _, strategy := range updateStrategies() {
		t.Run(string(strategy.Type), func(t *testing.T) {
			ds := newDaemonSet("foo")
			ds.Spec.UpdateStrategy = *strategy

			manager, podControl, _, err := newTestController(ds)
			if err != nil {
				t.Fatalf("error creating DaemonSets controller: %v", err)
			}

			manager.dsStore.Add(ds)
			addNodes(manager.nodeStore, 0, 1, nil)

			nodeName := "node-0"
			pod := newPod(fmt.Sprintf("%s-", nodeName), nodeName, simpleDaemonSetLabel, ds)

			// Add a failed Pod
			pod.Status.Phase = v1.PodFailed
			err = manager.podStore.Add(pod)
			if err != nil {
				t.Fatal(err)
			}

			backoffKey := failedPodsBackoffKey(ds, nodeName)

			// First sync will delete the pod, initializing backoff
			syncAndValidateDaemonSets(t, manager, ds, podControl, 0, 1, 1)
			initialDelay := manager.failedPodsBackoff.Get(backoffKey)
			if initialDelay <= 0 {
				t.Fatal("Initial delay is expected to be set.")
			}

			resetCounters(manager)

			// Immediate (second) sync gets limited by the backoff
			syncAndValidateDaemonSets(t, manager, ds, podControl, 0, 0, 0)
			delay := manager.failedPodsBackoff.Get(backoffKey)
			if delay != initialDelay {
				t.Fatal("Backoff delay shouldn't be raised while waiting.")
			}

			resetCounters(manager)

			// Sleep to wait out backoff
			fakeClock := manager.failedPodsBackoff.Clock

			// Move just before the backoff end time
			fakeClock.Sleep(delay - 1*time.Nanosecond)
			if !manager.failedPodsBackoff.IsInBackOffSinceUpdate(backoffKey, fakeClock.Now()) {
				t.Errorf("Backoff delay didn't last the whole waitout period.")
			}

			// Move to the backoff end time
			fakeClock.Sleep(1 * time.Nanosecond)
			if manager.failedPodsBackoff.IsInBackOffSinceUpdate(backoffKey, fakeClock.Now()) {
				t.Fatal("Backoff delay hasn't been reset after the period has passed.")
			}

			// After backoff time, it will delete the failed pod
			syncAndValidateDaemonSets(t, manager, ds, podControl, 0, 1, 1)
		})
	}
}

// Daemonset should not remove a running pod from a node if the pod doesn't
// tolerate the nodes NoSchedule taint
func TestNoScheduleTaintedDoesntEvicitRunningIntolerantPod(t *testing.T) {
	for _, strategy := range updateStrategies() {
		ds := newDaemonSet("intolerant")
		ds.Spec.UpdateStrategy = *strategy
		manager, podControl, _, err := newTestController(ds)
		if err != nil {
			t.Fatalf("error creating DaemonSets controller: %v", err)
		}

		node := newNode("tainted", nil)
		manager.nodeStore.Add(node)
		setNodeTaint(node, noScheduleTaints)
		manager.podStore.Add(newPod("keep-running-me", "tainted", simpleDaemonSetLabel, ds))
		manager.dsStore.Add(ds)

		syncAndValidateDaemonSets(t, manager, ds, podControl, 0, 0, 0)
	}
}

// Daemonset should remove a running pod from a node if the pod doesn't
// tolerate the nodes NoExecute taint
func TestNoExecuteTaintedDoesEvicitRunningIntolerantPod(t *testing.T) {
	for _, strategy := range updateStrategies() {
		ds := newDaemonSet("intolerant")
		ds.Spec.UpdateStrategy = *strategy
		manager, podControl, _, err := newTestController(ds)
		if err != nil {
			t.Fatalf("error creating DaemonSets controller: %v", err)
		}

		node := newNode("tainted", nil)
		manager.nodeStore.Add(node)
		setNodeTaint(node, noExecuteTaints)
		manager.podStore.Add(newPod("stop-running-me", "tainted", simpleDaemonSetLabel, ds))
		manager.dsStore.Add(ds)

		syncAndValidateDaemonSets(t, manager, ds, podControl, 0, 1, 0)
	}
}

// DaemonSet should not launch a pod on a tainted node when the pod doesn't tolerate that taint.
func TestTaintedNodeDaemonDoesNotLaunchIntolerantPod(t *testing.T) {
	for _, strategy := range updateStrategies() {
		ds := newDaemonSet("intolerant")
		ds.Spec.UpdateStrategy = *strategy
		manager, podControl, _, err := newTestController(ds)
		if err != nil {
			t.Fatalf("error creating DaemonSets controller: %v", err)
		}

		node := newNode("tainted", nil)
		setNodeTaint(node, noScheduleTaints)
		manager.nodeStore.Add(node)
		manager.dsStore.Add(ds)

		syncAndValidateDaemonSets(t, manager, ds, podControl, 0, 0, 0)
	}
}

// DaemonSet should launch a pod on a tainted node when the pod can tolerate that taint.
func TestTaintedNodeDaemonLaunchesToleratePod(t *testing.T) {
	for _, strategy := range updateStrategies() {
		ds := newDaemonSet("tolerate")
		ds.Spec.UpdateStrategy = *strategy
		setDaemonSetToleration(ds, noScheduleTolerations)
		manager, podControl, _, err := newTestController(ds)
		if err != nil {
			t.Fatalf("error creating DaemonSets controller: %v", err)
		}

		node := newNode("tainted", nil)
		setNodeTaint(node, noScheduleTaints)
		manager.nodeStore.Add(node)
		manager.dsStore.Add(ds)

		syncAndValidateDaemonSets(t, manager, ds, podControl, 1, 0, 0)
	}
}

// DaemonSet should launch a pod on a not ready node with taint notReady:NoExecute.
func TestNotReadyNodeDaemonLaunchesPod(t *testing.T) {
	for _, strategy := range updateStrategies() {
		ds := newDaemonSet("simple")
		ds.Spec.UpdateStrategy = *strategy
		manager, podControl, _, err := newTestController(ds)
		if err != nil {
			t.Fatalf("error creating DaemonSets controller: %v", err)
		}

		node := newNode("tainted", nil)
		setNodeTaint(node, nodeNotReady)
		node.Status.Conditions = []v1.NodeCondition{
			{Type: v1.NodeReady, Status: v1.ConditionFalse},
		}
		manager.nodeStore.Add(node)
		manager.dsStore.Add(ds)

		syncAndValidateDaemonSets(t, manager, ds, podControl, 1, 0, 0)
	}
}

// DaemonSet should launch a pod on an unreachable node with taint unreachable:NoExecute.
func TestUnreachableNodeDaemonLaunchesPod(t *testing.T) {
	for _, strategy := range updateStrategies() {
		ds := newDaemonSet("simple")
		ds.Spec.UpdateStrategy = *strategy
		manager, podControl, _, err := newTestController(ds)
		if err != nil {
			t.Fatalf("error creating DaemonSets controller: %v", err)
		}

		node := newNode("tainted", nil)
		setNodeTaint(node, nodeUnreachable)
		node.Status.Conditions = []v1.NodeCondition{
			{Type: v1.NodeReady, Status: v1.ConditionUnknown},
		}
		manager.nodeStore.Add(node)
		manager.dsStore.Add(ds)

		syncAndValidateDaemonSets(t, manager, ds, podControl, 1, 0, 0)
	}
}

// DaemonSet should launch a pod on an untainted node when the pod has tolerations.
func TestNodeDaemonLaunchesToleratePod(t *testing.T) {
	for _, strategy := range updateStrategies() {
		ds := newDaemonSet("tolerate")
		ds.Spec.UpdateStrategy = *strategy
		setDaemonSetToleration(ds, noScheduleTolerations)
		manager, podControl, _, err := newTestController(ds)
		if err != nil {
			t.Fatalf("error creating DaemonSets controller: %v", err)
		}
		addNodes(manager.nodeStore, 0, 1, nil)
		manager.dsStore.Add(ds)

		syncAndValidateDaemonSets(t, manager, ds, podControl, 1, 0, 0)
	}
}

// DaemonSet should launch a pod on a not ready node with taint notReady:NoExecute.
func TestDaemonSetRespectsTermination(t *testing.T) {
	for _, strategy := range updateStrategies() {
		ds := newDaemonSet("foo")
		ds.Spec.UpdateStrategy = *strategy
		manager, podControl, _, err := newTestController(ds)
		if err != nil {
			t.Fatalf("error creating DaemonSets controller: %v", err)
		}

		addNodes(manager.nodeStore, 0, 1, simpleNodeLabel)
		pod := newPod(fmt.Sprintf("%s-", "node-0"), "node-0", simpleDaemonSetLabel, ds)
		dt := metav1.Now()
		pod.DeletionTimestamp = &dt
		manager.podStore.Add(pod)
		manager.dsStore.Add(ds)
		syncAndValidateDaemonSets(t, manager, ds, podControl, 0, 0, 0)
	}
}

func setNodeTaint(node *v1.Node, taints []v1.Taint) {
	node.Spec.Taints = taints
}

func setDaemonSetToleration(ds *apps.DaemonSet, tolerations []v1.Toleration) {
	ds.Spec.Template.Spec.Tolerations = tolerations
}

// DaemonSet should launch a pod even when the node with MemoryPressure/DiskPressure/PIDPressure taints.
func TestTaintPressureNodeDaemonLaunchesPod(t *testing.T) {
	for _, strategy := range updateStrategies() {
		ds := newDaemonSet("critical")
		ds.Spec.UpdateStrategy = *strategy
		setDaemonSetCritical(ds)
		manager, podControl, _, err := newTestController(ds)
		if err != nil {
			t.Fatalf("error creating DaemonSets controller: %v", err)
		}

		node := newNode("resources-pressure", nil)
		node.Status.Conditions = []v1.NodeCondition{
			{Type: v1.NodeDiskPressure, Status: v1.ConditionTrue},
			{Type: v1.NodeMemoryPressure, Status: v1.ConditionTrue},
			{Type: v1.NodePIDPressure, Status: v1.ConditionTrue},
		}
		node.Spec.Taints = []v1.Taint{
			{Key: v1.TaintNodeDiskPressure, Effect: v1.TaintEffectNoSchedule},
			{Key: v1.TaintNodeMemoryPressure, Effect: v1.TaintEffectNoSchedule},
			{Key: v1.TaintNodePIDPressure, Effect: v1.TaintEffectNoSchedule},
		}
		manager.nodeStore.Add(node)
		manager.dsStore.Add(ds)
		syncAndValidateDaemonSets(t, manager, ds, podControl, 1, 0, 0)
	}
}

func setDaemonSetCritical(ds *apps.DaemonSet) {
	ds.Namespace = api.NamespaceSystem
	if ds.Spec.Template.ObjectMeta.Annotations == nil {
		ds.Spec.Template.ObjectMeta.Annotations = make(map[string]string)
	}
	podPriority := scheduling.SystemCriticalPriority
	ds.Spec.Template.Spec.Priority = &podPriority
}

func TestNodeShouldRunDaemonPod(t *testing.T) {
	shouldRun := true
	shouldContinueRunning := true
	cases := []struct {
		predicateName                    string
		podsOnNode                       []*v1.Pod
		nodeCondition                    []v1.NodeCondition
		nodeUnschedulable                bool
		ds                               *apps.DaemonSet
		shouldRun, shouldContinueRunning bool
		err                              error
	}{
		{
			predicateName: "ShouldRunDaemonPod",
			ds: &apps.DaemonSet{
				Spec: apps.DaemonSetSpec{
					Selector: &metav1.LabelSelector{MatchLabels: simpleDaemonSetLabel},
					Template: v1.PodTemplateSpec{
						ObjectMeta: metav1.ObjectMeta{
							Labels: simpleDaemonSetLabel,
						},
						Spec: resourcePodSpec("", "50M", "0.5"),
					},
				},
			},
			shouldRun:             true,
			shouldContinueRunning: true,
		},
		{
			predicateName: "InsufficientResourceError",
			ds: &apps.DaemonSet{
				Spec: apps.DaemonSetSpec{
					Selector: &metav1.LabelSelector{MatchLabels: simpleDaemonSetLabel},
					Template: v1.PodTemplateSpec{
						ObjectMeta: metav1.ObjectMeta{
							Labels: simpleDaemonSetLabel,
						},
						Spec: resourcePodSpec("", "200M", "0.5"),
					},
				},
			},
			shouldRun:             shouldRun,
			shouldContinueRunning: true,
		},
		{
			predicateName: "ErrPodNotMatchHostName",
			ds: &apps.DaemonSet{
				Spec: apps.DaemonSetSpec{
					Selector: &metav1.LabelSelector{MatchLabels: simpleDaemonSetLabel},
					Template: v1.PodTemplateSpec{
						ObjectMeta: metav1.ObjectMeta{
							Labels: simpleDaemonSetLabel,
						},
						Spec: resourcePodSpec("other-node", "50M", "0.5"),
					},
				},
			},
			shouldRun:             false,
			shouldContinueRunning: false,
		},
		{
			predicateName: "ErrPodNotFitsHostPorts",
			podsOnNode: []*v1.Pod{
				{
					Spec: v1.PodSpec{
						Containers: []v1.Container{{
							Ports: []v1.ContainerPort{{
								HostPort: 666,
							}},
						}},
					},
				},
			},
			ds: &apps.DaemonSet{
				Spec: apps.DaemonSetSpec{
					Selector: &metav1.LabelSelector{MatchLabels: simpleDaemonSetLabel},
					Template: v1.PodTemplateSpec{
						ObjectMeta: metav1.ObjectMeta{
							Labels: simpleDaemonSetLabel,
						},
						Spec: v1.PodSpec{
							Containers: []v1.Container{{
								Ports: []v1.ContainerPort{{
									HostPort: 666,
								}},
							}},
						},
					},
				},
			},
			shouldRun:             shouldRun,
			shouldContinueRunning: shouldContinueRunning,
		},
		{
			predicateName: "InsufficientResourceError",
			podsOnNode: []*v1.Pod{
				{
					Spec: v1.PodSpec{
						Containers: []v1.Container{{
							Ports: []v1.ContainerPort{{
								HostPort: 666,
							}},
							Resources: resourceContainerSpec("50M", "0.5"),
						}},
					},
				},
			},
			ds: &apps.DaemonSet{
				Spec: apps.DaemonSetSpec{
					Selector: &metav1.LabelSelector{MatchLabels: simpleDaemonSetLabel},
					Template: v1.PodTemplateSpec{
						ObjectMeta: metav1.ObjectMeta{
							Labels: simpleDaemonSetLabel,
						},
						Spec: resourcePodSpec("", "100M", "0.5"),
					},
				},
			},
			shouldRun:             shouldRun, // This is because we don't care about the resource constraints any more and let default scheduler handle it.
			shouldContinueRunning: true,
		},
		{
			predicateName: "ShouldRunDaemonPod",
			podsOnNode: []*v1.Pod{
				{
					Spec: v1.PodSpec{
						Containers: []v1.Container{{
							Ports: []v1.ContainerPort{{
								HostPort: 666,
							}},
							Resources: resourceContainerSpec("50M", "0.5"),
						}},
					},
				},
			},
			ds: &apps.DaemonSet{
				Spec: apps.DaemonSetSpec{
					Selector: &metav1.LabelSelector{MatchLabels: simpleDaemonSetLabel},
					Template: v1.PodTemplateSpec{
						ObjectMeta: metav1.ObjectMeta{
							Labels: simpleDaemonSetLabel,
						},
						Spec: resourcePodSpec("", "50M", "0.5"),
					},
				},
			},
			shouldRun:             true,
			shouldContinueRunning: true,
		},
		{
			predicateName: "ErrNodeSelectorNotMatch",
			ds: &apps.DaemonSet{
				Spec: apps.DaemonSetSpec{
					Selector: &metav1.LabelSelector{MatchLabels: simpleDaemonSetLabel},
					Template: v1.PodTemplateSpec{
						ObjectMeta: metav1.ObjectMeta{
							Labels: simpleDaemonSetLabel,
						},
						Spec: v1.PodSpec{
							NodeSelector: simpleDaemonSetLabel2,
						},
					},
				},
			},
			shouldRun:             false,
			shouldContinueRunning: false,
		},
		{
			predicateName: "ShouldRunDaemonPod",
			ds: &apps.DaemonSet{
				Spec: apps.DaemonSetSpec{
					Selector: &metav1.LabelSelector{MatchLabels: simpleDaemonSetLabel},
					Template: v1.PodTemplateSpec{
						ObjectMeta: metav1.ObjectMeta{
							Labels: simpleDaemonSetLabel,
						},
						Spec: v1.PodSpec{
							NodeSelector: simpleDaemonSetLabel,
						},
					},
				},
			},
			shouldRun:             true,
			shouldContinueRunning: true,
		},
		{
			predicateName: "ErrPodAffinityNotMatch",
			ds: &apps.DaemonSet{
				Spec: apps.DaemonSetSpec{
					Selector: &metav1.LabelSelector{MatchLabels: simpleDaemonSetLabel},
					Template: v1.PodTemplateSpec{
						ObjectMeta: metav1.ObjectMeta{
							Labels: simpleDaemonSetLabel,
						},
						Spec: v1.PodSpec{
							Affinity: &v1.Affinity{
								NodeAffinity: &v1.NodeAffinity{
									RequiredDuringSchedulingIgnoredDuringExecution: &v1.NodeSelector{
										NodeSelectorTerms: []v1.NodeSelectorTerm{
											{
												MatchExpressions: []v1.NodeSelectorRequirement{
													{
														Key:      "type",
														Operator: v1.NodeSelectorOpIn,
														Values:   []string{"test"},
													},
												},
											},
										},
									},
								},
							},
						},
					},
				},
			},
			shouldRun:             false,
			shouldContinueRunning: false,
		},
		{
			predicateName: "ShouldRunDaemonPod",
			ds: &apps.DaemonSet{
				Spec: apps.DaemonSetSpec{
					Selector: &metav1.LabelSelector{MatchLabels: simpleDaemonSetLabel},
					Template: v1.PodTemplateSpec{
						ObjectMeta: metav1.ObjectMeta{
							Labels: simpleDaemonSetLabel,
						},
						Spec: v1.PodSpec{
							Affinity: &v1.Affinity{
								NodeAffinity: &v1.NodeAffinity{
									RequiredDuringSchedulingIgnoredDuringExecution: &v1.NodeSelector{
										NodeSelectorTerms: []v1.NodeSelectorTerm{
											{
												MatchExpressions: []v1.NodeSelectorRequirement{
													{
														Key:      "type",
														Operator: v1.NodeSelectorOpIn,
														Values:   []string{"production"},
													},
												},
											},
										},
									},
								},
							},
						},
					},
				},
			},
			shouldRun:             true,
			shouldContinueRunning: true,
		},
		{
			predicateName: "ShouldRunDaemonPodOnUnscheduableNode",
			ds: &apps.DaemonSet{
				Spec: apps.DaemonSetSpec{
					Selector: &metav1.LabelSelector{MatchLabels: simpleDaemonSetLabel},
					Template: v1.PodTemplateSpec{
						ObjectMeta: metav1.ObjectMeta{
							Labels: simpleDaemonSetLabel,
						},
						Spec: resourcePodSpec("", "50M", "0.5"),
					},
				},
			},
			nodeUnschedulable:     true,
			shouldRun:             true,
			shouldContinueRunning: true,
		},
	}

	for i, c := range cases {
		for _, strategy := range updateStrategies() {
			node := newNode("test-node", simpleDaemonSetLabel)
			node.Status.Conditions = append(node.Status.Conditions, c.nodeCondition...)
			node.Status.Allocatable = allocatableResources("100M", "1")
			node.Spec.Unschedulable = c.nodeUnschedulable
			manager, _, _, err := newTestController()
			if err != nil {
				t.Fatalf("error creating DaemonSets controller: %v", err)
			}
			manager.nodeStore.Add(node)
			for _, p := range c.podsOnNode {
				manager.podStore.Add(p)
				p.Spec.NodeName = "test-node"
				manager.podNodeIndex.Add(p)
			}
			c.ds.Spec.UpdateStrategy = *strategy
			shouldRun, shouldContinueRunning, err := manager.nodeShouldRunDaemonPod(node, c.ds)

			if shouldRun != c.shouldRun {
				t.Errorf("[%v] strategy: %v, predicateName: %v expected shouldRun: %v, got: %v", i, c.ds.Spec.UpdateStrategy.Type, c.predicateName, c.shouldRun, shouldRun)
			}
			if shouldContinueRunning != c.shouldContinueRunning {
				t.Errorf("[%v] strategy: %v, predicateName: %v expected shouldContinueRunning: %v, got: %v", i, c.ds.Spec.UpdateStrategy.Type, c.predicateName, c.shouldContinueRunning, shouldContinueRunning)
			}
			if err != c.err {
				t.Errorf("[%v] strategy: %v, predicateName: %v expected err: %v, got: %v", i, c.predicateName, c.ds.Spec.UpdateStrategy.Type, c.err, err)
			}
		}
	}
}

// DaemonSets should be resynced when node labels or taints changed
func TestUpdateNode(t *testing.T) {
	var enqueued bool
	cases := []struct {
		test               string
		newNode            *v1.Node
		oldNode            *v1.Node
		ds                 *apps.DaemonSet
		expectedEventsFunc func(strategyType apps.DaemonSetUpdateStrategyType) int
		shouldEnqueue      bool
		expectedCreates    func() int
	}{
		{
			test:    "Nothing changed, should not enqueue",
			oldNode: newNode("node1", nil),
			newNode: newNode("node1", nil),
			ds: func() *apps.DaemonSet {
				ds := newDaemonSet("ds")
				ds.Spec.Template.Spec.NodeSelector = simpleNodeLabel
				return ds
			}(),
			shouldEnqueue:   false,
			expectedCreates: func() int { return 0 },
		},
		{
			test:    "Node labels changed",
			oldNode: newNode("node1", nil),
			newNode: newNode("node1", simpleNodeLabel),
			ds: func() *apps.DaemonSet {
				ds := newDaemonSet("ds")
				ds.Spec.Template.Spec.NodeSelector = simpleNodeLabel
				return ds
			}(),
			shouldEnqueue:   true,
			expectedCreates: func() int { return 0 },
		},
		{
			test: "Node taints changed",
			oldNode: func() *v1.Node {
				node := newNode("node1", nil)
				setNodeTaint(node, noScheduleTaints)
				return node
			}(),
			newNode:         newNode("node1", nil),
			ds:              newDaemonSet("ds"),
			shouldEnqueue:   true,
			expectedCreates: func() int { return 0 },
		},
		{
			test:    "Node Allocatable changed",
			oldNode: newNode("node1", nil),
			newNode: func() *v1.Node {
				node := newNode("node1", nil)
				node.Status.Allocatable = allocatableResources("200M", "200m")
				return node
			}(),
			ds: func() *apps.DaemonSet {
				ds := newDaemonSet("ds")
				ds.Spec.Template.Spec = resourcePodSpecWithoutNodeName("200M", "200m")
				return ds
			}(),
			expectedEventsFunc: func(strategyType apps.DaemonSetUpdateStrategyType) int {
				switch strategyType {
				case apps.OnDeleteDaemonSetStrategyType:
					return 0
				case apps.RollingUpdateDaemonSetStrategyType:
					return 0
				default:
					t.Fatalf("unexpected UpdateStrategy %+v", strategyType)
				}
				return 0
			},
			shouldEnqueue: false,
			expectedCreates: func() int {
				return 1
			},
		},
	}
	for _, c := range cases {
		for _, strategy := range updateStrategies() {
			manager, podControl, _, err := newTestController()
			if err != nil {
				t.Fatalf("error creating DaemonSets controller: %v", err)
			}
			manager.nodeStore.Add(c.oldNode)
			c.ds.Spec.UpdateStrategy = *strategy
			manager.dsStore.Add(c.ds)

			expectedEvents := 0
			if c.expectedEventsFunc != nil {
				expectedEvents = c.expectedEventsFunc(strategy.Type)
			}
			expectedCreates := 0
			if c.expectedCreates != nil {
				expectedCreates = c.expectedCreates()
			}
			syncAndValidateDaemonSets(t, manager, c.ds, podControl, expectedCreates, 0, expectedEvents)

			manager.enqueueDaemonSet = func(ds *apps.DaemonSet) {
				if ds.Name == "ds" {
					enqueued = true
				}
			}

			enqueued = false
			manager.updateNode(c.oldNode, c.newNode)
			if enqueued != c.shouldEnqueue {
				t.Errorf("Test case: '%s', expected: %t, got: %t", c.test, c.shouldEnqueue, enqueued)
			}
		}
	}
}

// DaemonSets should be resynced when non-daemon pods was deleted.
func TestDeleteNoDaemonPod(t *testing.T) {
	var enqueued bool

	cases := []struct {
		test          string
		node          *v1.Node
		existPods     []*v1.Pod
		deletedPod    *v1.Pod
		ds            *apps.DaemonSet
		shouldEnqueue bool
	}{
		{
			test: "Deleted non-daemon pods to release resources",
			node: func() *v1.Node {
				node := newNode("node1", nil)
				node.Status.Conditions = []v1.NodeCondition{
					{Type: v1.NodeReady, Status: v1.ConditionTrue},
				}
				node.Status.Allocatable = allocatableResources("200M", "200m")
				return node
			}(),
			existPods: func() []*v1.Pod {
				pods := []*v1.Pod{}
				for i := 0; i < 4; i++ {
					podSpec := resourcePodSpec("node1", "50M", "50m")
					pods = append(pods, &v1.Pod{
						ObjectMeta: metav1.ObjectMeta{
							Name: fmt.Sprintf("pod_%d", i),
						},
						Spec: podSpec,
					})
				}
				return pods
			}(),
			deletedPod: func() *v1.Pod {
				podSpec := resourcePodSpec("node1", "50M", "50m")
				return &v1.Pod{
					ObjectMeta: metav1.ObjectMeta{
						Name: "pod_0",
					},
					Spec: podSpec,
				}
			}(),
			ds: func() *apps.DaemonSet {
				ds := newDaemonSet("ds")
				ds.Spec.Template.Spec = resourcePodSpec("", "50M", "50m")
				return ds
			}(),
			shouldEnqueue: false,
		},
		{
			test: "Deleted non-daemon pods (with controller) to release resources",
			node: func() *v1.Node {
				node := newNode("node1", nil)
				node.Status.Conditions = []v1.NodeCondition{
					{Type: v1.NodeReady, Status: v1.ConditionTrue},
				}
				node.Status.Allocatable = allocatableResources("200M", "200m")
				return node
			}(),
			existPods: func() []*v1.Pod {
				pods := []*v1.Pod{}
				for i := 0; i < 4; i++ {
					podSpec := resourcePodSpec("node1", "50M", "50m")
					pods = append(pods, &v1.Pod{
						ObjectMeta: metav1.ObjectMeta{
							Name: fmt.Sprintf("pod_%d", i),
							OwnerReferences: []metav1.OwnerReference{
								{Controller: func() *bool { res := true; return &res }()},
							},
						},
						Spec: podSpec,
					})
				}
				return pods
			}(),
			deletedPod: func() *v1.Pod {
				podSpec := resourcePodSpec("node1", "50M", "50m")
				return &v1.Pod{
					ObjectMeta: metav1.ObjectMeta{
						Name: "pod_0",
						OwnerReferences: []metav1.OwnerReference{
							{Controller: func() *bool { res := true; return &res }()},
						},
					},
					Spec: podSpec,
				}
			}(),
			ds: func() *apps.DaemonSet {
				ds := newDaemonSet("ds")
				ds.Spec.Template.Spec = resourcePodSpec("", "50M", "50m")
				return ds
			}(),
			shouldEnqueue: false,
		},
		{
			test: "Deleted no scheduled pods",
			node: func() *v1.Node {
				node := newNode("node1", nil)
				node.Status.Conditions = []v1.NodeCondition{
					{Type: v1.NodeReady, Status: v1.ConditionTrue},
				}
				node.Status.Allocatable = allocatableResources("200M", "200m")
				return node
			}(),
			existPods: func() []*v1.Pod {
				pods := []*v1.Pod{}
				for i := 0; i < 4; i++ {
					podSpec := resourcePodSpec("node1", "50M", "50m")
					pods = append(pods, &v1.Pod{
						ObjectMeta: metav1.ObjectMeta{
							Name: fmt.Sprintf("pod_%d", i),
							OwnerReferences: []metav1.OwnerReference{
								{Controller: func() *bool { res := true; return &res }()},
							},
						},
						Spec: podSpec,
					})
				}
				return pods
			}(),
			deletedPod: func() *v1.Pod {
				podSpec := resourcePodSpec("", "50M", "50m")
				return &v1.Pod{
					ObjectMeta: metav1.ObjectMeta{
						Name: "pod_5",
					},
					Spec: podSpec,
				}
			}(),
			ds: func() *apps.DaemonSet {
				ds := newDaemonSet("ds")
				ds.Spec.Template.Spec = resourcePodSpec("", "50M", "50m")
				return ds
			}(),
			shouldEnqueue: false,
		},
	}

	for _, c := range cases {
		for _, strategy := range updateStrategies() {
			manager, podControl, _, err := newTestController()
			if err != nil {
				t.Fatalf("error creating DaemonSets controller: %v", err)
			}
			manager.nodeStore.Add(c.node)
			c.ds.Spec.UpdateStrategy = *strategy
			manager.dsStore.Add(c.ds)
			for _, pod := range c.existPods {
				manager.podStore.Add(pod)
			}
			switch strategy.Type {
			case apps.OnDeleteDaemonSetStrategyType, apps.RollingUpdateDaemonSetStrategyType:
				syncAndValidateDaemonSets(t, manager, c.ds, podControl, 1, 0, 0)
			default:
				t.Fatalf("unexpected UpdateStrategy %+v", strategy)
			}

			enqueued = false
			manager.deletePod(c.deletedPod)
			if enqueued != c.shouldEnqueue {
				t.Errorf("Test case: '%s', expected: %t, got: %t", c.test, c.shouldEnqueue, enqueued)
			}
		}
	}
}

func TestDeleteUnscheduledPodForNotExistingNode(t *testing.T) {
	for _, strategy := range updateStrategies() {
		ds := newDaemonSet("foo")
		ds.Spec.UpdateStrategy = *strategy
		manager, podControl, _, err := newTestController(ds)
		if err != nil {
			t.Fatalf("error creating DaemonSets controller: %v", err)
		}
		manager.dsStore.Add(ds)
		addNodes(manager.nodeStore, 0, 1, nil)
		addPods(manager.podStore, "node-0", simpleDaemonSetLabel, ds, 1)
		addPods(manager.podStore, "node-1", simpleDaemonSetLabel, ds, 1)

		podScheduledUsingAffinity := newPod("pod1-node-3", "", simpleDaemonSetLabel, ds)
		podScheduledUsingAffinity.Spec.Affinity = &v1.Affinity{
			NodeAffinity: &v1.NodeAffinity{
				RequiredDuringSchedulingIgnoredDuringExecution: &v1.NodeSelector{
					NodeSelectorTerms: []v1.NodeSelectorTerm{
						{
							MatchFields: []v1.NodeSelectorRequirement{
								{
									Key:      api.ObjectNameField,
									Operator: v1.NodeSelectorOpIn,
									Values:   []string{"node-2"},
								},
							},
						},
					},
				},
			},
		}
		manager.podStore.Add(podScheduledUsingAffinity)
		syncAndValidateDaemonSets(t, manager, ds, podControl, 0, 1, 0)
	}
}

func TestGetNodesToDaemonPods(t *testing.T) {
	for _, strategy := range updateStrategies() {
		ds := newDaemonSet("foo")
		ds.Spec.UpdateStrategy = *strategy
		ds2 := newDaemonSet("foo2")
		ds2.Spec.UpdateStrategy = *strategy
		manager, _, _, err := newTestController(ds, ds2)
		if err != nil {
			t.Fatalf("error creating DaemonSets controller: %v", err)
		}
		manager.dsStore.Add(ds)
		manager.dsStore.Add(ds2)
		addNodes(manager.nodeStore, 0, 2, nil)

		// These pods should be returned.
		wantedPods := []*v1.Pod{
			newPod("matching-owned-0-", "node-0", simpleDaemonSetLabel, ds),
			newPod("matching-orphan-0-", "node-0", simpleDaemonSetLabel, nil),
			newPod("matching-owned-1-", "node-1", simpleDaemonSetLabel, ds),
			newPod("matching-orphan-1-", "node-1", simpleDaemonSetLabel, nil),
		}
		failedPod := newPod("matching-owned-failed-pod-1-", "node-1", simpleDaemonSetLabel, ds)
		failedPod.Status = v1.PodStatus{Phase: v1.PodFailed}
		wantedPods = append(wantedPods, failedPod)
		for _, pod := range wantedPods {
			manager.podStore.Add(pod)
		}

		// These pods should be ignored.
		ignoredPods := []*v1.Pod{
			newPod("non-matching-owned-0-", "node-0", simpleDaemonSetLabel2, ds),
			newPod("non-matching-orphan-1-", "node-1", simpleDaemonSetLabel2, nil),
			newPod("matching-owned-by-other-0-", "node-0", simpleDaemonSetLabel, ds2),
		}
		for _, pod := range ignoredPods {
			manager.podStore.Add(pod)
		}

		nodesToDaemonPods, err := manager.getNodesToDaemonPods(ds)
		if err != nil {
			t.Fatalf("getNodesToDaemonPods() error: %v", err)
		}
		gotPods := map[string]bool{}
		for node, pods := range nodesToDaemonPods {
			for _, pod := range pods {
				if pod.Spec.NodeName != node {
					t.Errorf("pod %v grouped into %v but belongs in %v", pod.Name, node, pod.Spec.NodeName)
				}
				gotPods[pod.Name] = true
			}
		}
		for _, pod := range wantedPods {
			if !gotPods[pod.Name] {
				t.Errorf("expected pod %v but didn't get it", pod.Name)
			}
			delete(gotPods, pod.Name)
		}
		for podName := range gotPods {
			t.Errorf("unexpected pod %v was returned", podName)
		}
	}
}

func TestAddNode(t *testing.T) {
	manager, _, _, err := newTestController()
	if err != nil {
		t.Fatalf("error creating DaemonSets controller: %v", err)
	}
	node1 := newNode("node1", nil)
	ds := newDaemonSet("ds")
	ds.Spec.Template.Spec.NodeSelector = simpleNodeLabel
	manager.dsStore.Add(ds)

	manager.addNode(node1)
	if got, want := manager.queue.Len(), 0; got != want {
		t.Fatalf("queue.Len() = %v, want %v", got, want)
	}

	node2 := newNode("node2", simpleNodeLabel)
	manager.addNode(node2)
	if got, want := manager.queue.Len(), 1; got != want {
		t.Fatalf("queue.Len() = %v, want %v", got, want)
	}
	key, done := manager.queue.Get()
	if key == nil || done {
		t.Fatalf("failed to enqueue controller for node %v", node2.Name)
	}
}

func TestAddPod(t *testing.T) {
	for _, strategy := range updateStrategies() {
		manager, _, _, err := newTestController()
		if err != nil {
			t.Fatalf("error creating DaemonSets controller: %v", err)
		}
		ds1 := newDaemonSet("foo1")
		ds1.Spec.UpdateStrategy = *strategy
		ds2 := newDaemonSet("foo2")
		ds2.Spec.UpdateStrategy = *strategy
		manager.dsStore.Add(ds1)
		manager.dsStore.Add(ds2)

		pod1 := newPod("pod1-", "node-0", simpleDaemonSetLabel, ds1)
		manager.addPod(pod1)
		if got, want := manager.queue.Len(), 1; got != want {
			t.Fatalf("queue.Len() = %v, want %v", got, want)
		}
		key, done := manager.queue.Get()
		if key == nil || done {
			t.Fatalf("failed to enqueue controller for pod %v", pod1.Name)
		}
		expectedKey, _ := controller.KeyFunc(ds1)
		if got, want := key.(string), expectedKey; got != want {
			t.Errorf("queue.Get() = %v, want %v", got, want)
		}

		pod2 := newPod("pod2-", "node-0", simpleDaemonSetLabel, ds2)
		manager.addPod(pod2)
		if got, want := manager.queue.Len(), 1; got != want {
			t.Fatalf("queue.Len() = %v, want %v", got, want)
		}
		key, done = manager.queue.Get()
		if key == nil || done {
			t.Fatalf("failed to enqueue controller for pod %v", pod2.Name)
		}
		expectedKey, _ = controller.KeyFunc(ds2)
		if got, want := key.(string), expectedKey; got != want {
			t.Errorf("queue.Get() = %v, want %v", got, want)
		}
	}
}

func TestAddPodOrphan(t *testing.T) {
	for _, strategy := range updateStrategies() {
		manager, _, _, err := newTestController()
		if err != nil {
			t.Fatalf("error creating DaemonSets controller: %v", err)
		}
		ds1 := newDaemonSet("foo1")
		ds1.Spec.UpdateStrategy = *strategy
		ds2 := newDaemonSet("foo2")
		ds2.Spec.UpdateStrategy = *strategy
		ds3 := newDaemonSet("foo3")
		ds3.Spec.UpdateStrategy = *strategy
		ds3.Spec.Selector.MatchLabels = simpleDaemonSetLabel2
		manager.dsStore.Add(ds1)
		manager.dsStore.Add(ds2)
		manager.dsStore.Add(ds3)

		// Make pod an orphan. Expect matching sets to be queued.
		pod := newPod("pod1-", "node-0", simpleDaemonSetLabel, nil)
		manager.addPod(pod)
		if got, want := manager.queue.Len(), 2; got != want {
			t.Fatalf("queue.Len() = %v, want %v", got, want)
		}
		if got, want := getQueuedKeys(manager.queue), []string{"default/foo1", "default/foo2"}; !reflect.DeepEqual(got, want) {
			t.Errorf("getQueuedKeys() = %v, want %v", got, want)
		}
	}
}

func TestUpdatePod(t *testing.T) {
	for _, strategy := range updateStrategies() {
		manager, _, _, err := newTestController()
		if err != nil {
			t.Fatalf("error creating DaemonSets controller: %v", err)
		}
		ds1 := newDaemonSet("foo1")
		ds1.Spec.UpdateStrategy = *strategy
		ds2 := newDaemonSet("foo2")
		ds2.Spec.UpdateStrategy = *strategy
		manager.dsStore.Add(ds1)
		manager.dsStore.Add(ds2)

		pod1 := newPod("pod1-", "node-0", simpleDaemonSetLabel, ds1)
		prev := *pod1
		bumpResourceVersion(pod1)
		manager.updatePod(&prev, pod1)
		if got, want := manager.queue.Len(), 1; got != want {
			t.Fatalf("queue.Len() = %v, want %v", got, want)
		}
		key, done := manager.queue.Get()
		if key == nil || done {
			t.Fatalf("failed to enqueue controller for pod %v", pod1.Name)
		}
		expectedKey, _ := controller.KeyFunc(ds1)
		if got, want := key.(string), expectedKey; got != want {
			t.Errorf("queue.Get() = %v, want %v", got, want)
		}

		pod2 := newPod("pod2-", "node-0", simpleDaemonSetLabel, ds2)
		prev = *pod2
		bumpResourceVersion(pod2)
		manager.updatePod(&prev, pod2)
		if got, want := manager.queue.Len(), 1; got != want {
			t.Fatalf("queue.Len() = %v, want %v", got, want)
		}
		key, done = manager.queue.Get()
		if key == nil || done {
			t.Fatalf("failed to enqueue controller for pod %v", pod2.Name)
		}
		expectedKey, _ = controller.KeyFunc(ds2)
		if got, want := key.(string), expectedKey; got != want {
			t.Errorf("queue.Get() = %v, want %v", got, want)
		}
	}
}

func TestUpdatePodOrphanSameLabels(t *testing.T) {
	for _, strategy := range updateStrategies() {
		manager, _, _, err := newTestController()
		if err != nil {
			t.Fatalf("error creating DaemonSets controller: %v", err)
		}
		ds1 := newDaemonSet("foo1")
		ds1.Spec.UpdateStrategy = *strategy
		ds2 := newDaemonSet("foo2")
		ds2.Spec.UpdateStrategy = *strategy
		manager.dsStore.Add(ds1)
		manager.dsStore.Add(ds2)

		pod := newPod("pod1-", "node-0", simpleDaemonSetLabel, nil)
		prev := *pod
		bumpResourceVersion(pod)
		manager.updatePod(&prev, pod)
		if got, want := manager.queue.Len(), 0; got != want {
			t.Fatalf("queue.Len() = %v, want %v", got, want)
		}
	}
}

func TestUpdatePodOrphanWithNewLabels(t *testing.T) {
	for _, strategy := range updateStrategies() {
		manager, _, _, err := newTestController()
		if err != nil {
			t.Fatalf("error creating DaemonSets controller: %v", err)
		}
		ds1 := newDaemonSet("foo1")
		ds1.Spec.UpdateStrategy = *strategy
		ds2 := newDaemonSet("foo2")
		ds2.Spec.UpdateStrategy = *strategy
		manager.dsStore.Add(ds1)
		manager.dsStore.Add(ds2)

		pod := newPod("pod1-", "node-0", simpleDaemonSetLabel, nil)
		prev := *pod
		prev.Labels = map[string]string{"foo2": "bar2"}
		bumpResourceVersion(pod)
		manager.updatePod(&prev, pod)
		if got, want := manager.queue.Len(), 2; got != want {
			t.Fatalf("queue.Len() = %v, want %v", got, want)
		}
		if got, want := getQueuedKeys(manager.queue), []string{"default/foo1", "default/foo2"}; !reflect.DeepEqual(got, want) {
			t.Errorf("getQueuedKeys() = %v, want %v", got, want)
		}
	}
}

func TestUpdatePodChangeControllerRef(t *testing.T) {
	for _, strategy := range updateStrategies() {
		ds := newDaemonSet("foo")
		ds.Spec.UpdateStrategy = *strategy
		manager, _, _, err := newTestController()
		if err != nil {
			t.Fatalf("error creating DaemonSets controller: %v", err)
		}
		ds1 := newDaemonSet("foo1")
		ds2 := newDaemonSet("foo2")
		manager.dsStore.Add(ds1)
		manager.dsStore.Add(ds2)

		pod := newPod("pod1-", "node-0", simpleDaemonSetLabel, ds1)
		prev := *pod
		prev.OwnerReferences = []metav1.OwnerReference{*metav1.NewControllerRef(ds2, controllerKind)}
		bumpResourceVersion(pod)
		manager.updatePod(&prev, pod)
		if got, want := manager.queue.Len(), 2; got != want {
			t.Fatalf("queue.Len() = %v, want %v", got, want)
		}
	}
}

func TestUpdatePodControllerRefRemoved(t *testing.T) {
	for _, strategy := range updateStrategies() {
		manager, _, _, err := newTestController()
		if err != nil {
			t.Fatalf("error creating DaemonSets controller: %v", err)
		}
		ds1 := newDaemonSet("foo1")
		ds1.Spec.UpdateStrategy = *strategy
		ds2 := newDaemonSet("foo2")
		ds2.Spec.UpdateStrategy = *strategy
		manager.dsStore.Add(ds1)
		manager.dsStore.Add(ds2)

		pod := newPod("pod1-", "node-0", simpleDaemonSetLabel, ds1)
		prev := *pod
		pod.OwnerReferences = nil
		bumpResourceVersion(pod)
		manager.updatePod(&prev, pod)
		if got, want := manager.queue.Len(), 2; got != want {
			t.Fatalf("queue.Len() = %v, want %v", got, want)
		}
	}
}

func TestDeletePod(t *testing.T) {
	for _, strategy := range updateStrategies() {
		manager, _, _, err := newTestController()
		if err != nil {
			t.Fatalf("error creating DaemonSets controller: %v", err)
		}
		ds1 := newDaemonSet("foo1")
		ds1.Spec.UpdateStrategy = *strategy
		ds2 := newDaemonSet("foo2")
		ds2.Spec.UpdateStrategy = *strategy
		manager.dsStore.Add(ds1)
		manager.dsStore.Add(ds2)

		pod1 := newPod("pod1-", "node-0", simpleDaemonSetLabel, ds1)
		manager.deletePod(pod1)
		if got, want := manager.queue.Len(), 1; got != want {
			t.Fatalf("queue.Len() = %v, want %v", got, want)
		}
		key, done := manager.queue.Get()
		if key == nil || done {
			t.Fatalf("failed to enqueue controller for pod %v", pod1.Name)
		}
		expectedKey, _ := controller.KeyFunc(ds1)
		if got, want := key.(string), expectedKey; got != want {
			t.Errorf("queue.Get() = %v, want %v", got, want)
		}

		pod2 := newPod("pod2-", "node-0", simpleDaemonSetLabel, ds2)
		manager.deletePod(pod2)
		if got, want := manager.queue.Len(), 1; got != want {
			t.Fatalf("queue.Len() = %v, want %v", got, want)
		}
		key, done = manager.queue.Get()
		if key == nil || done {
			t.Fatalf("failed to enqueue controller for pod %v", pod2.Name)
		}
		expectedKey, _ = controller.KeyFunc(ds2)
		if got, want := key.(string), expectedKey; got != want {
			t.Errorf("queue.Get() = %v, want %v", got, want)
		}
	}
}

func TestDeletePodOrphan(t *testing.T) {
	for _, strategy := range updateStrategies() {
		manager, _, _, err := newTestController()
		if err != nil {
			t.Fatalf("error creating DaemonSets controller: %v", err)
		}
		ds1 := newDaemonSet("foo1")
		ds1.Spec.UpdateStrategy = *strategy
		ds2 := newDaemonSet("foo2")
		ds2.Spec.UpdateStrategy = *strategy
		ds3 := newDaemonSet("foo3")
		ds3.Spec.UpdateStrategy = *strategy
		ds3.Spec.Selector.MatchLabels = simpleDaemonSetLabel2
		manager.dsStore.Add(ds1)
		manager.dsStore.Add(ds2)
		manager.dsStore.Add(ds3)

		pod := newPod("pod1-", "node-0", simpleDaemonSetLabel, nil)
		manager.deletePod(pod)
		if got, want := manager.queue.Len(), 0; got != want {
			t.Fatalf("queue.Len() = %v, want %v", got, want)
		}
	}
}

func bumpResourceVersion(obj metav1.Object) {
	ver, _ := strconv.ParseInt(obj.GetResourceVersion(), 10, 32)
	obj.SetResourceVersion(strconv.FormatInt(ver+1, 10))
}

// getQueuedKeys returns a sorted list of keys in the queue.
// It can be used to quickly check that multiple keys are in there.
func getQueuedKeys(queue workqueue.RateLimitingInterface) []string {
	var keys []string
	count := queue.Len()
	for i := 0; i < count; i++ {
		key, done := queue.Get()
		if done {
			return keys
		}
		keys = append(keys, key.(string))
	}
	sort.Strings(keys)
	return keys
}