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util.go
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util.go
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/*
Copyright 2017 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 scheduler
import (
"fmt"
"testing"
"time"
"k8s.io/api/core/v1"
"k8s.io/apimachinery/pkg/api/errors"
"k8s.io/apimachinery/pkg/api/resource"
metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
"k8s.io/apimachinery/pkg/util/uuid"
"k8s.io/apimachinery/pkg/util/wait"
informers "k8s.io/client-go/informers"
clientset "k8s.io/client-go/kubernetes"
clientv1core "k8s.io/client-go/kubernetes/typed/core/v1"
corelisters "k8s.io/client-go/listers/core/v1"
restclient "k8s.io/client-go/rest"
"k8s.io/client-go/tools/record"
"k8s.io/kubernetes/pkg/api"
"k8s.io/kubernetes/pkg/api/testapi"
"k8s.io/kubernetes/plugin/pkg/scheduler"
_ "k8s.io/kubernetes/plugin/pkg/scheduler/algorithmprovider"
"k8s.io/kubernetes/plugin/pkg/scheduler/factory"
"k8s.io/kubernetes/test/integration/framework"
"net/http/httptest"
)
type TestContext struct {
closeFn framework.CloseFunc
httpServer *httptest.Server
ns *v1.Namespace
clientSet *clientset.Clientset
informerFactory informers.SharedInformerFactory
schedulerConfigFactory scheduler.Configurator
schedulerConfig *scheduler.Config
scheduler *scheduler.Scheduler
}
// initTest initializes a test environment and creates a scheduler with default
// configuration.
func initTest(t *testing.T, nsPrefix string) *TestContext {
var context TestContext
_, context.httpServer, context.closeFn = framework.RunAMaster(nil)
context.ns = framework.CreateTestingNamespace(nsPrefix+string(uuid.NewUUID()), context.httpServer, t)
context.clientSet = clientset.NewForConfigOrDie(&restclient.Config{Host: context.httpServer.URL, ContentConfig: restclient.ContentConfig{GroupVersion: testapi.Groups[v1.GroupName].GroupVersion()}})
context.informerFactory = informers.NewSharedInformerFactory(context.clientSet, 0)
context.schedulerConfigFactory = factory.NewConfigFactory(
v1.DefaultSchedulerName,
context.clientSet,
context.informerFactory.Core().V1().Nodes(),
context.informerFactory.Core().V1().Pods(),
context.informerFactory.Core().V1().PersistentVolumes(),
context.informerFactory.Core().V1().PersistentVolumeClaims(),
context.informerFactory.Core().V1().ReplicationControllers(),
context.informerFactory.Extensions().V1beta1().ReplicaSets(),
context.informerFactory.Apps().V1beta1().StatefulSets(),
context.informerFactory.Core().V1().Services(),
v1.DefaultHardPodAffinitySymmetricWeight,
true,
)
var err error
context.schedulerConfig, err = context.schedulerConfigFactory.Create()
if err != nil {
t.Fatalf("Couldn't create scheduler config: %v", err)
}
eventBroadcaster := record.NewBroadcaster()
context.schedulerConfig.Recorder = eventBroadcaster.NewRecorder(api.Scheme, v1.EventSource{Component: v1.DefaultSchedulerName})
eventBroadcaster.StartRecordingToSink(&clientv1core.EventSinkImpl{Interface: clientv1core.New(context.clientSet.CoreV1().RESTClient()).Events("")})
context.informerFactory.Start(context.schedulerConfig.StopEverything)
context.scheduler, err = scheduler.NewFromConfigurator(&scheduler.FakeConfigurator{Config: context.schedulerConfig}, nil...)
if err != nil {
t.Fatalf("Couldn't create scheduler: %v", err)
}
context.scheduler.Run()
return &context
}
// cleanupTest deletes the scheduler and the test namespace. It should be called
// at the end of a test.
func cleanupTest(t *testing.T, context *TestContext) {
// Kill the scheduler.
close(context.schedulerConfig.StopEverything)
// Cleanup nodes.
context.clientSet.CoreV1().Nodes().DeleteCollection(nil, metav1.ListOptions{})
framework.DeleteTestingNamespace(context.ns, context.httpServer, t)
context.closeFn()
}
// waitForReflection waits till the passFunc confirms that the object it expects
// to see is in the store. Used to observe reflected events.
func waitForReflection(t *testing.T, nodeLister corelisters.NodeLister, key string, passFunc func(n interface{}) bool) error {
nodes := []*v1.Node{}
err := wait.Poll(time.Millisecond*100, wait.ForeverTestTimeout, func() (bool, error) {
n, err := nodeLister.Get(key)
switch {
case err == nil && passFunc(n):
return true, nil
case errors.IsNotFound(err):
nodes = append(nodes, nil)
case err != nil:
t.Errorf("Unexpected error: %v", err)
default:
nodes = append(nodes, n)
}
return false, nil
})
if err != nil {
t.Logf("Logging consecutive node versions received from store:")
for i, n := range nodes {
t.Logf("%d: %#v", i, n)
}
}
return err
}
// nodeHasLabels returns a function that checks if a node has all the given labels.
func nodeHasLabels(cs clientset.Interface, nodeName string, labels map[string]string) wait.ConditionFunc {
return func() (bool, error) {
node, err := cs.CoreV1().Nodes().Get(nodeName, metav1.GetOptions{})
if errors.IsNotFound(err) {
return false, nil
}
if err != nil {
// This could be a connection error so we want to retry.
return false, nil
}
for k, v := range labels {
if node.Labels == nil || node.Labels[k] != v {
return false, nil
}
}
return true, nil
}
}
// waitForNodeLabels waits for the given node to have all the given labels.
func waitForNodeLabels(cs clientset.Interface, nodeName string, labels map[string]string) error {
return wait.Poll(time.Millisecond*100, wait.ForeverTestTimeout, nodeHasLabels(cs, nodeName, labels))
}
// createNode creates a node with the given resource list and
// returns a pointer and error status. If 'res' is nil, a predefined amount of
// resource will be used.
func createNode(cs clientset.Interface, name string, res *v1.ResourceList) (*v1.Node, error) {
// if resource is nil, we use a default amount of resources for the node.
if res == nil {
res = &v1.ResourceList{
v1.ResourcePods: *resource.NewQuantity(32, resource.DecimalSI),
}
}
n := &v1.Node{
ObjectMeta: metav1.ObjectMeta{Name: name},
Spec: v1.NodeSpec{Unschedulable: false},
Status: v1.NodeStatus{
Capacity: *res,
},
}
return cs.CoreV1().Nodes().Create(n)
}
// createNodes creates `numNodes` nodes. The created node names will be in the
// form of "`prefix`-X" where X is an ordinal.
func createNodes(cs clientset.Interface, prefix string, res *v1.ResourceList, numNodes int) ([]*v1.Node, error) {
nodes := make([]*v1.Node, numNodes)
for i := 0; i < numNodes; i++ {
nodeName := fmt.Sprintf("%v-%d", prefix, i)
node, err := createNode(cs, nodeName, res)
if err != nil {
return nodes[:], err
}
nodes[i] = node
}
return nodes[:], nil
}
type pausePodConfig struct {
Name string
Namespace string
Affinity *v1.Affinity
Annotations, Labels, NodeSelector map[string]string
Resources *v1.ResourceRequirements
Tolerations []v1.Toleration
NodeName string
SchedulerName string
Priority *int32
}
// initPausePod initializes a pod API object from the given config. It is used
// mainly in pod creation process.
func initPausePod(cs clientset.Interface, conf *pausePodConfig) *v1.Pod {
pod := &v1.Pod{
ObjectMeta: metav1.ObjectMeta{
Name: conf.Name,
Namespace: conf.Namespace,
Labels: conf.Labels,
Annotations: conf.Annotations,
},
Spec: v1.PodSpec{
NodeSelector: conf.NodeSelector,
Affinity: conf.Affinity,
Containers: []v1.Container{
{
Name: conf.Name,
Image: framework.GetPauseImageName(cs),
},
},
Tolerations: conf.Tolerations,
NodeName: conf.NodeName,
SchedulerName: conf.SchedulerName,
Priority: conf.Priority,
},
}
if conf.Resources != nil {
pod.Spec.Containers[0].Resources = *conf.Resources
}
return pod
}
// createPausePod creates a pod with "Pause" image and the given config and
// return its pointer and error status.
func createPausePod(cs clientset.Interface, p *v1.Pod) (*v1.Pod, error) {
return cs.CoreV1().Pods(p.Namespace).Create(p)
}
// createPausePodWithResource creates a pod with "Pause" image and the given
// resources and returns its pointer and error status. The resource list can be
// nil.
func createPausePodWithResource(cs clientset.Interface, podName string, nsName string, res *v1.ResourceList) (*v1.Pod, error) {
var conf pausePodConfig
if res == nil {
conf = pausePodConfig{
Name: podName,
Namespace: nsName,
}
} else {
conf = pausePodConfig{
Name: podName,
Namespace: nsName,
Resources: &v1.ResourceRequirements{
Requests: *res,
},
}
}
return createPausePod(cs, initPausePod(cs, &conf))
}
// runPausePod creates a pod with "Pause" image and the given config and waits
// until it is scheduled. It returns its pointer and error status.
func runPausePod(cs clientset.Interface, pod *v1.Pod) (*v1.Pod, error) {
pod, err := cs.CoreV1().Pods(pod.Namespace).Create(pod)
if err != nil {
return nil, fmt.Errorf("Error creating pause pod: %v", err)
}
if err = waitForPodToSchedule(cs, pod); err != nil {
return pod, fmt.Errorf("Pod %v didn't schedule successfully. Error: %v", pod.Name, err)
}
if pod, err = cs.CoreV1().Pods(pod.Namespace).Get(pod.Name, metav1.GetOptions{}); err != nil {
return pod, fmt.Errorf("Error getting pod %v info: %v", pod.Name, err)
}
return pod, nil
}
// podDeleted returns true if a pod is not found in the given namespace.
func podDeleted(c clientset.Interface, podNamespace, podName string) wait.ConditionFunc {
return func() (bool, error) {
pod, err := c.CoreV1().Pods(podNamespace).Get(podName, metav1.GetOptions{})
if pod.DeletionTimestamp != nil {
return true, nil
}
if errors.IsNotFound(err) {
return true, nil
}
return false, nil
}
}
// podIsGettingEvicted returns true if the pod's deletion timestamp is set.
func podIsGettingEvicted(c clientset.Interface, podNamespace, podName string) wait.ConditionFunc {
return func() (bool, error) {
pod, err := c.CoreV1().Pods(podNamespace).Get(podName, metav1.GetOptions{})
if err != nil {
return false, err
}
if pod.DeletionTimestamp != nil {
return true, nil
}
return false, nil
}
}
// podScheduled returns true if a node is assigned to the given pod.
func podScheduled(c clientset.Interface, podNamespace, podName string) wait.ConditionFunc {
return func() (bool, error) {
pod, err := c.CoreV1().Pods(podNamespace).Get(podName, metav1.GetOptions{})
if errors.IsNotFound(err) {
return false, nil
}
if err != nil {
// This could be a connection error so we want to retry.
return false, nil
}
if pod.Spec.NodeName == "" {
return false, nil
}
return true, nil
}
}
// waitForPodToScheduleWithTimeout waits for a pod to get scheduled and returns
// an error if it does not scheduled within the given timeout.
func waitForPodToScheduleWithTimeout(cs clientset.Interface, pod *v1.Pod, timeout time.Duration) error {
return wait.Poll(time.Second, timeout, podScheduled(cs, pod.Namespace, pod.Name))
}
// waitForPodToSchedule waits for a pod to get scheduled and returns an error if
// it does not scheduled within the timeout duration (30 seconds).
func waitForPodToSchedule(cs clientset.Interface, pod *v1.Pod) error {
return waitForPodToScheduleWithTimeout(cs, pod, wait.ForeverTestTimeout)
}
// deletePod deletes the given pod in the given namespace.
func deletePod(cs clientset.Interface, podName string, nsName string) error {
return cs.CoreV1().Pods(nsName).Delete(podName, metav1.NewDeleteOptions(0))
}
// printAllPods prints a list of all the pods and their node names. This is used
// for debugging.
func printAllPods(t *testing.T, cs clientset.Interface, nsName string) {
podList, err := cs.CoreV1().Pods(nsName).List(metav1.ListOptions{})
if err != nil {
t.Logf("Error getting pods: %v", err)
}
for _, pod := range podList.Items {
t.Logf("Pod:\n\tName:%v\n\tNamespace:%v\n\tNode Name:%v\n", pod.Name, pod.Namespace, pod.Spec.NodeName)
}
}