382 lines
12 KiB
Go
382 lines
12 KiB
Go
/*
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Copyright 2015 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 controller
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import (
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"encoding/json"
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"fmt"
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"math/rand"
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"net/http/httptest"
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"reflect"
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"sort"
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"sync"
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"testing"
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"time"
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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/util/sets"
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restclient "k8s.io/client-go/rest"
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"k8s.io/client-go/util/clock"
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utiltesting "k8s.io/client-go/util/testing"
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"k8s.io/kubernetes/pkg/api"
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"k8s.io/kubernetes/pkg/api/testapi"
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"k8s.io/kubernetes/pkg/api/v1"
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"k8s.io/kubernetes/pkg/client/cache"
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"k8s.io/kubernetes/pkg/client/clientset_generated/clientset"
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"k8s.io/kubernetes/pkg/client/record"
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"k8s.io/kubernetes/pkg/securitycontext"
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"k8s.io/kubernetes/pkg/util/uuid"
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)
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// NewFakeControllerExpectationsLookup creates a fake store for PodExpectations.
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func NewFakeControllerExpectationsLookup(ttl time.Duration) (*ControllerExpectations, *clock.FakeClock) {
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fakeTime := time.Date(2009, time.November, 10, 23, 0, 0, 0, time.UTC)
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fakeClock := clock.NewFakeClock(fakeTime)
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ttlPolicy := &cache.TTLPolicy{Ttl: ttl, Clock: fakeClock}
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ttlStore := cache.NewFakeExpirationStore(
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ExpKeyFunc, nil, ttlPolicy, fakeClock)
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return &ControllerExpectations{ttlStore}, fakeClock
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}
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func newReplicationController(replicas int) *v1.ReplicationController {
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rc := &v1.ReplicationController{
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TypeMeta: metav1.TypeMeta{APIVersion: api.Registry.GroupOrDie(v1.GroupName).GroupVersion.String()},
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ObjectMeta: metav1.ObjectMeta{
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UID: uuid.NewUUID(),
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Name: "foobar",
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Namespace: metav1.NamespaceDefault,
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ResourceVersion: "18",
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},
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Spec: v1.ReplicationControllerSpec{
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Replicas: func() *int32 { i := int32(replicas); return &i }(),
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Selector: map[string]string{"foo": "bar"},
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Template: &v1.PodTemplateSpec{
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ObjectMeta: metav1.ObjectMeta{
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Labels: map[string]string{
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"name": "foo",
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"type": "production",
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},
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},
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Spec: v1.PodSpec{
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Containers: []v1.Container{
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{
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Image: "foo/bar",
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TerminationMessagePath: v1.TerminationMessagePathDefault,
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ImagePullPolicy: v1.PullIfNotPresent,
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SecurityContext: securitycontext.ValidSecurityContextWithContainerDefaults(),
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},
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},
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RestartPolicy: v1.RestartPolicyAlways,
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DNSPolicy: v1.DNSDefault,
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NodeSelector: map[string]string{
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"baz": "blah",
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},
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},
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},
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},
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}
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return rc
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}
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// create count pods with the given phase for the given rc (same selectors and namespace), and add them to the store.
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func newPodList(store cache.Store, count int, status v1.PodPhase, rc *v1.ReplicationController) *v1.PodList {
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pods := []v1.Pod{}
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for i := 0; i < count; i++ {
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newPod := v1.Pod{
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ObjectMeta: metav1.ObjectMeta{
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Name: fmt.Sprintf("pod%d", i),
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Labels: rc.Spec.Selector,
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Namespace: rc.Namespace,
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},
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Status: v1.PodStatus{Phase: status},
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}
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if store != nil {
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store.Add(&newPod)
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}
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pods = append(pods, newPod)
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}
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return &v1.PodList{
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Items: pods,
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}
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}
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func TestControllerExpectations(t *testing.T) {
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ttl := 30 * time.Second
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e, fakeClock := NewFakeControllerExpectationsLookup(ttl)
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// In practice we can't really have add and delete expectations since we only either create or
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// delete replicas in one rc pass, and the rc goes to sleep soon after until the expectations are
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// either fulfilled or timeout.
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adds, dels := 10, 30
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rc := newReplicationController(1)
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// RC fires off adds and deletes at apiserver, then sets expectations
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rcKey, err := KeyFunc(rc)
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if err != nil {
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t.Errorf("Couldn't get key for object %#v: %v", rc, err)
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}
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e.SetExpectations(rcKey, adds, dels)
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var wg sync.WaitGroup
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for i := 0; i < adds+1; i++ {
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wg.Add(1)
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go func() {
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// In prod this can happen either because of a failed create by the rc
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// or after having observed a create via informer
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e.CreationObserved(rcKey)
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wg.Done()
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}()
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}
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wg.Wait()
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// There are still delete expectations
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if e.SatisfiedExpectations(rcKey) {
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t.Errorf("Rc will sync before expectations are met")
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}
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for i := 0; i < dels+1; i++ {
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wg.Add(1)
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go func() {
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e.DeletionObserved(rcKey)
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wg.Done()
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}()
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}
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wg.Wait()
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// Expectations have been surpassed
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if podExp, exists, err := e.GetExpectations(rcKey); err == nil && exists {
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add, del := podExp.GetExpectations()
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if add != -1 || del != -1 {
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t.Errorf("Unexpected pod expectations %#v", podExp)
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}
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} else {
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t.Errorf("Could not get expectations for rc, exists %v and err %v", exists, err)
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}
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if !e.SatisfiedExpectations(rcKey) {
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t.Errorf("Expectations are met but the rc will not sync")
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}
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// Next round of rc sync, old expectations are cleared
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e.SetExpectations(rcKey, 1, 2)
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if podExp, exists, err := e.GetExpectations(rcKey); err == nil && exists {
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add, del := podExp.GetExpectations()
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if add != 1 || del != 2 {
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t.Errorf("Unexpected pod expectations %#v", podExp)
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}
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} else {
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t.Errorf("Could not get expectations for rc, exists %v and err %v", exists, err)
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}
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// Expectations have expired because of ttl
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fakeClock.Step(ttl + 1)
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if !e.SatisfiedExpectations(rcKey) {
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t.Errorf("Expectations should have expired but didn't")
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}
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}
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func TestUIDExpectations(t *testing.T) {
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uidExp := NewUIDTrackingControllerExpectations(NewControllerExpectations())
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rcList := []*v1.ReplicationController{
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newReplicationController(2),
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newReplicationController(1),
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newReplicationController(0),
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newReplicationController(5),
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}
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rcToPods := map[string][]string{}
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rcKeys := []string{}
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for i := range rcList {
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rc := rcList[i]
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rcName := fmt.Sprintf("rc-%v", i)
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rc.Name = rcName
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rc.Spec.Selector[rcName] = rcName
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podList := newPodList(nil, 5, v1.PodRunning, rc)
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rcKey, err := KeyFunc(rc)
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if err != nil {
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t.Fatalf("Couldn't get key for object %#v: %v", rc, err)
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}
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rcKeys = append(rcKeys, rcKey)
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rcPodNames := []string{}
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for i := range podList.Items {
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p := &podList.Items[i]
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p.Name = fmt.Sprintf("%v-%v", p.Name, rc.Name)
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rcPodNames = append(rcPodNames, PodKey(p))
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}
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rcToPods[rcKey] = rcPodNames
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uidExp.ExpectDeletions(rcKey, rcPodNames)
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}
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for i := range rcKeys {
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j := rand.Intn(i + 1)
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rcKeys[i], rcKeys[j] = rcKeys[j], rcKeys[i]
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}
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for _, rcKey := range rcKeys {
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if uidExp.SatisfiedExpectations(rcKey) {
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t.Errorf("Controller %v satisfied expectations before deletion", rcKey)
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}
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for _, p := range rcToPods[rcKey] {
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uidExp.DeletionObserved(rcKey, p)
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}
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if !uidExp.SatisfiedExpectations(rcKey) {
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t.Errorf("Controller %v didn't satisfy expectations after deletion", rcKey)
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}
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uidExp.DeleteExpectations(rcKey)
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if uidExp.GetUIDs(rcKey) != nil {
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t.Errorf("Failed to delete uid expectations for %v", rcKey)
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}
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}
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}
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func TestCreatePods(t *testing.T) {
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ns := metav1.NamespaceDefault
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body := runtime.EncodeOrDie(testapi.Default.Codec(), &v1.Pod{ObjectMeta: metav1.ObjectMeta{Name: "empty_pod"}})
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fakeHandler := utiltesting.FakeHandler{
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StatusCode: 200,
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ResponseBody: string(body),
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}
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testServer := httptest.NewServer(&fakeHandler)
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defer testServer.Close()
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clientset := clientset.NewForConfigOrDie(&restclient.Config{Host: testServer.URL, ContentConfig: restclient.ContentConfig{GroupVersion: &api.Registry.GroupOrDie(v1.GroupName).GroupVersion}})
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podControl := RealPodControl{
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KubeClient: clientset,
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Recorder: &record.FakeRecorder{},
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}
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controllerSpec := newReplicationController(1)
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// Make sure createReplica sends a POST to the apiserver with a pod from the controllers pod template
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if err := podControl.CreatePods(ns, controllerSpec.Spec.Template, controllerSpec); err != nil {
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t.Fatalf("unexpected error: %v", err)
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}
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expectedPod := v1.Pod{
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ObjectMeta: metav1.ObjectMeta{
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Labels: controllerSpec.Spec.Template.Labels,
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GenerateName: fmt.Sprintf("%s-", controllerSpec.Name),
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},
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Spec: controllerSpec.Spec.Template.Spec,
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}
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fakeHandler.ValidateRequest(t, testapi.Default.ResourcePath("pods", metav1.NamespaceDefault, ""), "POST", nil)
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var actualPod = &v1.Pod{}
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err := json.Unmarshal([]byte(fakeHandler.RequestBody), actualPod)
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if err != nil {
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t.Fatalf("Unexpected error: %v", err)
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}
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if !api.Semantic.DeepDerivative(&expectedPod, actualPod) {
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t.Logf("Body: %s", fakeHandler.RequestBody)
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t.Errorf("Unexpected mismatch. Expected\n %#v,\n Got:\n %#v", &expectedPod, actualPod)
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}
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}
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func TestActivePodFiltering(t *testing.T) {
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// This rc is not needed by the test, only the newPodList to give the pods labels/a namespace.
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rc := newReplicationController(0)
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podList := newPodList(nil, 5, v1.PodRunning, rc)
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podList.Items[0].Status.Phase = v1.PodSucceeded
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podList.Items[1].Status.Phase = v1.PodFailed
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expectedNames := sets.NewString()
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for _, pod := range podList.Items[2:] {
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expectedNames.Insert(pod.Name)
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}
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var podPointers []*v1.Pod
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for i := range podList.Items {
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podPointers = append(podPointers, &podList.Items[i])
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}
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got := FilterActivePods(podPointers)
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gotNames := sets.NewString()
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for _, pod := range got {
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gotNames.Insert(pod.Name)
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}
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if expectedNames.Difference(gotNames).Len() != 0 || gotNames.Difference(expectedNames).Len() != 0 {
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t.Errorf("expected %v, got %v", expectedNames.List(), gotNames.List())
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}
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}
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func TestSortingActivePods(t *testing.T) {
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numPods := 9
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// This rc is not needed by the test, only the newPodList to give the pods labels/a namespace.
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rc := newReplicationController(0)
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podList := newPodList(nil, numPods, v1.PodRunning, rc)
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pods := make([]*v1.Pod, len(podList.Items))
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for i := range podList.Items {
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pods[i] = &podList.Items[i]
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}
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// pods[0] is not scheduled yet.
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pods[0].Spec.NodeName = ""
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pods[0].Status.Phase = v1.PodPending
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// pods[1] is scheduled but pending.
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pods[1].Spec.NodeName = "bar"
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pods[1].Status.Phase = v1.PodPending
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// pods[2] is unknown.
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pods[2].Spec.NodeName = "foo"
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pods[2].Status.Phase = v1.PodUnknown
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// pods[3] is running but not ready.
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pods[3].Spec.NodeName = "foo"
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pods[3].Status.Phase = v1.PodRunning
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// pods[4] is running and ready but without LastTransitionTime.
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now := metav1.Now()
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pods[4].Spec.NodeName = "foo"
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pods[4].Status.Phase = v1.PodRunning
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pods[4].Status.Conditions = []v1.PodCondition{{Type: v1.PodReady, Status: v1.ConditionTrue}}
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pods[4].Status.ContainerStatuses = []v1.ContainerStatus{{RestartCount: 3}, {RestartCount: 0}}
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// pods[5] is running and ready and with LastTransitionTime.
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pods[5].Spec.NodeName = "foo"
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pods[5].Status.Phase = v1.PodRunning
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pods[5].Status.Conditions = []v1.PodCondition{{Type: v1.PodReady, Status: v1.ConditionTrue, LastTransitionTime: now}}
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pods[5].Status.ContainerStatuses = []v1.ContainerStatus{{RestartCount: 3}, {RestartCount: 0}}
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// pods[6] is running ready for a longer time than pods[5].
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then := metav1.Time{Time: now.AddDate(0, -1, 0)}
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pods[6].Spec.NodeName = "foo"
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pods[6].Status.Phase = v1.PodRunning
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pods[6].Status.Conditions = []v1.PodCondition{{Type: v1.PodReady, Status: v1.ConditionTrue, LastTransitionTime: then}}
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pods[6].Status.ContainerStatuses = []v1.ContainerStatus{{RestartCount: 3}, {RestartCount: 0}}
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// pods[7] has lower container restart count than pods[6].
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pods[7].Spec.NodeName = "foo"
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pods[7].Status.Phase = v1.PodRunning
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pods[7].Status.Conditions = []v1.PodCondition{{Type: v1.PodReady, Status: v1.ConditionTrue, LastTransitionTime: then}}
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pods[7].Status.ContainerStatuses = []v1.ContainerStatus{{RestartCount: 2}, {RestartCount: 1}}
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pods[7].CreationTimestamp = now
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// pods[8] is older than pods[7].
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pods[8].Spec.NodeName = "foo"
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pods[8].Status.Phase = v1.PodRunning
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pods[8].Status.Conditions = []v1.PodCondition{{Type: v1.PodReady, Status: v1.ConditionTrue, LastTransitionTime: then}}
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pods[8].Status.ContainerStatuses = []v1.ContainerStatus{{RestartCount: 2}, {RestartCount: 1}}
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pods[8].CreationTimestamp = then
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getOrder := func(pods []*v1.Pod) []string {
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names := make([]string, len(pods))
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for i := range pods {
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names[i] = pods[i].Name
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}
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return names
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}
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expected := getOrder(pods)
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for i := 0; i < 20; i++ {
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idx := rand.Perm(numPods)
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randomizedPods := make([]*v1.Pod, numPods)
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for j := 0; j < numPods; j++ {
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randomizedPods[j] = pods[idx[j]]
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}
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sort.Sort(ActivePods(randomizedPods))
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actual := getOrder(randomizedPods)
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if !reflect.DeepEqual(actual, expected) {
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t.Errorf("expected %v, got %v", expected, actual)
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}
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}
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}
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