forked from kubernetes/kubernetes
/
cacher_test.go
426 lines (363 loc) · 13.9 KB
/
cacher_test.go
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/*
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 storage_test
import (
"fmt"
"reflect"
goruntime "runtime"
"strconv"
"testing"
"time"
"k8s.io/kubernetes/pkg/api"
"k8s.io/kubernetes/pkg/api/errors"
"k8s.io/kubernetes/pkg/api/meta"
"k8s.io/kubernetes/pkg/api/testapi"
apitesting "k8s.io/kubernetes/pkg/api/testing"
"k8s.io/kubernetes/pkg/api/unversioned"
"k8s.io/kubernetes/pkg/labels"
"k8s.io/kubernetes/pkg/runtime"
"k8s.io/kubernetes/pkg/storage"
etcdstorage "k8s.io/kubernetes/pkg/storage/etcd"
"k8s.io/kubernetes/pkg/storage/etcd/etcdtest"
etcdtesting "k8s.io/kubernetes/pkg/storage/etcd/testing"
"k8s.io/kubernetes/pkg/util/sets"
"k8s.io/kubernetes/pkg/util/wait"
"k8s.io/kubernetes/pkg/watch"
"golang.org/x/net/context"
)
func newEtcdTestStorage(t *testing.T, codec runtime.Codec, prefix string) (*etcdtesting.EtcdTestServer, storage.Interface) {
server := etcdtesting.NewEtcdTestClientServer(t)
storage := etcdstorage.NewEtcdStorage(server.Client, codec, prefix, false, etcdtest.DeserializationCacheSize)
return server, storage
}
func newTestCacher(s storage.Interface) *storage.Cacher {
prefix := "pods"
config := storage.CacherConfig{
CacheCapacity: 10,
Storage: s,
Versioner: etcdstorage.APIObjectVersioner{},
Type: &api.Pod{},
ResourcePrefix: prefix,
KeyFunc: func(obj runtime.Object) (string, error) { return storage.NamespaceKeyFunc(prefix, obj) },
NewListFunc: func() runtime.Object { return &api.PodList{} },
Codec: testapi.Default.Codec(),
}
return storage.NewCacherFromConfig(config)
}
func makeTestPod(name string) *api.Pod {
return &api.Pod{
ObjectMeta: api.ObjectMeta{Namespace: "ns", Name: name},
Spec: apitesting.DeepEqualSafePodSpec(),
}
}
func updatePod(t *testing.T, s storage.Interface, obj, old *api.Pod) *api.Pod {
updateFn := func(input runtime.Object, res storage.ResponseMeta) (runtime.Object, *uint64, error) {
newObj, err := api.Scheme.DeepCopy(obj)
if err != nil {
t.Errorf("unexpected error: %v", err)
return nil, nil, err
}
return newObj.(*api.Pod), nil, nil
}
key := etcdtest.AddPrefix("pods/" + obj.Namespace + "/" + obj.Name)
if err := s.GuaranteedUpdate(context.TODO(), key, &api.Pod{}, old == nil, nil, updateFn); err != nil {
t.Errorf("unexpected error: %v", err)
}
obj.ResourceVersion = ""
result := &api.Pod{}
if err := s.Get(context.TODO(), key, result, false); err != nil {
t.Errorf("unexpected error: %v", err)
}
return result
}
func TestList(t *testing.T) {
server, etcdStorage := newEtcdTestStorage(t, testapi.Default.Codec(), etcdtest.PathPrefix())
defer server.Terminate(t)
cacher := newTestCacher(etcdStorage)
defer cacher.Stop()
podFoo := makeTestPod("foo")
podBar := makeTestPod("bar")
podBaz := makeTestPod("baz")
podFooPrime := makeTestPod("foo")
podFooPrime.Spec.NodeName = "fakeNode"
fooCreated := updatePod(t, etcdStorage, podFoo, nil)
_ = updatePod(t, etcdStorage, podBar, nil)
_ = updatePod(t, etcdStorage, podBaz, nil)
_ = updatePod(t, etcdStorage, podFooPrime, fooCreated)
// Create a pod in a namespace that contains "ns" as a prefix
// Make sure it is not returned in a watch of "ns"
podFooNS2 := makeTestPod("foo")
podFooNS2.Namespace += "2"
updatePod(t, etcdStorage, podFooNS2, nil)
deleted := api.Pod{}
if err := etcdStorage.Delete(context.TODO(), etcdtest.AddPrefix("pods/ns/bar"), &deleted, nil); err != nil {
t.Errorf("Unexpected error: %v", err)
}
// We first List directly from etcd by passing empty resourceVersion,
// to get the current etcd resourceVersion.
rvResult := &api.PodList{}
if err := cacher.List(context.TODO(), "pods/ns", "", storage.Everything, rvResult); err != nil {
t.Errorf("Unexpected error: %v", err)
}
deletedPodRV := rvResult.ListMeta.ResourceVersion
result := &api.PodList{}
// We pass the current etcd ResourceVersion received from the above List() operation,
// since there is not easy way to get ResourceVersion of barPod deletion operation.
if err := cacher.List(context.TODO(), "pods/ns", deletedPodRV, storage.Everything, result); err != nil {
t.Errorf("Unexpected error: %v", err)
}
if result.ListMeta.ResourceVersion != deletedPodRV {
t.Errorf("Incorrect resource version: %v", result.ListMeta.ResourceVersion)
}
if len(result.Items) != 2 {
t.Errorf("Unexpected list result: %d", len(result.Items))
}
keys := sets.String{}
for _, item := range result.Items {
keys.Insert(item.Name)
}
if !keys.HasAll("foo", "baz") {
t.Errorf("Unexpected list result: %#v", result)
}
for _, item := range result.Items {
// unset fields that are set by the infrastructure
item.ResourceVersion = ""
item.CreationTimestamp = unversioned.Time{}
if item.Namespace != "ns" {
t.Errorf("Unexpected namespace: %s", item.Namespace)
}
var expected *api.Pod
switch item.Name {
case "foo":
expected = podFooPrime
case "baz":
expected = podBaz
default:
t.Errorf("Unexpected item: %v", item)
}
if e, a := *expected, item; !reflect.DeepEqual(e, a) {
t.Errorf("Expected: %#v, got: %#v", e, a)
}
}
}
func verifyWatchEvent(t *testing.T, w watch.Interface, eventType watch.EventType, eventObject runtime.Object) {
_, _, line, _ := goruntime.Caller(1)
select {
case event := <-w.ResultChan():
if e, a := eventType, event.Type; e != a {
t.Logf("(called from line %d)", line)
t.Errorf("Expected: %s, got: %s", eventType, event.Type)
}
if e, a := eventObject, event.Object; !api.Semantic.DeepDerivative(e, a) {
t.Logf("(called from line %d)", line)
t.Errorf("Expected (%s): %#v, got: %#v", eventType, e, a)
}
case <-time.After(wait.ForeverTestTimeout):
t.Logf("(called from line %d)", line)
t.Errorf("Timed out waiting for an event")
}
}
type injectListError struct {
errors int
storage.Interface
}
func (self *injectListError) List(ctx context.Context, key string, resourceVersion string, filter storage.Filter, listObj runtime.Object) error {
if self.errors > 0 {
self.errors--
return fmt.Errorf("injected error")
}
return self.Interface.List(ctx, key, resourceVersion, filter, listObj)
}
func TestWatch(t *testing.T) {
server, etcdStorage := newEtcdTestStorage(t, testapi.Default.Codec(), etcdtest.PathPrefix())
// Inject one list error to make sure we test the relist case.
etcdStorage = &injectListError{errors: 1, Interface: etcdStorage}
defer server.Terminate(t)
cacher := newTestCacher(etcdStorage)
defer cacher.Stop()
podFoo := makeTestPod("foo")
podBar := makeTestPod("bar")
podFooPrime := makeTestPod("foo")
podFooPrime.Spec.NodeName = "fakeNode"
podFooBis := makeTestPod("foo")
podFooBis.Spec.NodeName = "anotherFakeNode"
podFooNS2 := makeTestPod("foo")
podFooNS2.Namespace += "2"
// initialVersion is used to initate the watcher at the beginning of the world,
// which is not defined precisely in etcd.
initialVersion, err := cacher.LastSyncResourceVersion()
if err != nil {
t.Fatalf("Unexpected error: %v", err)
}
startVersion := strconv.Itoa(int(initialVersion))
// Set up Watch for object "podFoo".
watcher, err := cacher.Watch(context.TODO(), "pods/ns/foo", startVersion, storage.Everything)
if err != nil {
t.Fatalf("Unexpected error: %v", err)
}
defer watcher.Stop()
// Create in another namespace first to make sure events from other namespaces don't get delivered
updatePod(t, etcdStorage, podFooNS2, nil)
fooCreated := updatePod(t, etcdStorage, podFoo, nil)
_ = updatePod(t, etcdStorage, podBar, nil)
fooUpdated := updatePod(t, etcdStorage, podFooPrime, fooCreated)
verifyWatchEvent(t, watcher, watch.Added, podFoo)
verifyWatchEvent(t, watcher, watch.Modified, podFooPrime)
// Check whether we get too-old error via the watch channel
tooOldWatcher, err := cacher.Watch(context.TODO(), "pods/ns/foo", "1", storage.Everything)
if err != nil {
t.Fatalf("Expected no direct error, got %v", err)
}
defer tooOldWatcher.Stop()
// Ensure we get a "Gone" error
expectedGoneError := errors.NewGone("").ErrStatus
verifyWatchEvent(t, tooOldWatcher, watch.Error, &expectedGoneError)
initialWatcher, err := cacher.Watch(context.TODO(), "pods/ns/foo", fooCreated.ResourceVersion, storage.Everything)
if err != nil {
t.Fatalf("Unexpected error: %v", err)
}
defer initialWatcher.Stop()
verifyWatchEvent(t, initialWatcher, watch.Modified, podFooPrime)
// Now test watch from "now".
nowWatcher, err := cacher.Watch(context.TODO(), "pods/ns/foo", "0", storage.Everything)
if err != nil {
t.Fatalf("Unexpected error: %v", err)
}
defer nowWatcher.Stop()
verifyWatchEvent(t, nowWatcher, watch.Added, podFooPrime)
_ = updatePod(t, etcdStorage, podFooBis, fooUpdated)
verifyWatchEvent(t, nowWatcher, watch.Modified, podFooBis)
}
func TestWatcherTimeout(t *testing.T) {
server, etcdStorage := newEtcdTestStorage(t, testapi.Default.Codec(), etcdtest.PathPrefix())
defer server.Terminate(t)
cacher := newTestCacher(etcdStorage)
defer cacher.Stop()
// initialVersion is used to initate the watcher at the beginning of the world,
// which is not defined precisely in etcd.
initialVersion, err := cacher.LastSyncResourceVersion()
if err != nil {
t.Fatalf("Unexpected error: %v", err)
}
startVersion := strconv.Itoa(int(initialVersion))
// Create a watcher that will not be reading any result.
watcher, err := cacher.WatchList(context.TODO(), "pods/ns", startVersion, storage.Everything)
if err != nil {
t.Fatalf("Unexpected error: %v", err)
}
defer watcher.Stop()
// Create a second watcher that will be reading result.
readingWatcher, err := cacher.WatchList(context.TODO(), "pods/ns", startVersion, storage.Everything)
if err != nil {
t.Fatalf("Unexpected error: %v", err)
}
defer readingWatcher.Stop()
for i := 1; i <= 22; i++ {
pod := makeTestPod(strconv.Itoa(i))
_ = updatePod(t, etcdStorage, pod, nil)
verifyWatchEvent(t, readingWatcher, watch.Added, pod)
}
}
func TestFiltering(t *testing.T) {
server, etcdStorage := newEtcdTestStorage(t, testapi.Default.Codec(), etcdtest.PathPrefix())
defer server.Terminate(t)
cacher := newTestCacher(etcdStorage)
defer cacher.Stop()
// Ensure that the cacher is initialized, before creating any pods,
// so that we are sure that all events will be present in cacher.
syncWatcher, err := cacher.Watch(context.TODO(), "pods/ns/foo", "0", storage.Everything)
if err != nil {
t.Fatalf("Unexpected error: %v", err)
}
syncWatcher.Stop()
podFoo := makeTestPod("foo")
podFoo.Labels = map[string]string{"filter": "foo"}
podFooFiltered := makeTestPod("foo")
podFooPrime := makeTestPod("foo")
podFooPrime.Labels = map[string]string{"filter": "foo"}
podFooPrime.Spec.NodeName = "fakeNode"
podFooNS2 := makeTestPod("foo")
podFooNS2.Namespace += "2"
podFooNS2.Labels = map[string]string{"filter": "foo"}
// Create in another namespace first to make sure events from other namespaces don't get delivered
updatePod(t, etcdStorage, podFooNS2, nil)
fooCreated := updatePod(t, etcdStorage, podFoo, nil)
fooFiltered := updatePod(t, etcdStorage, podFooFiltered, fooCreated)
fooUnfiltered := updatePod(t, etcdStorage, podFoo, fooFiltered)
_ = updatePod(t, etcdStorage, podFooPrime, fooUnfiltered)
deleted := api.Pod{}
if err := etcdStorage.Delete(context.TODO(), etcdtest.AddPrefix("pods/ns/foo"), &deleted, nil); err != nil {
t.Errorf("Unexpected error: %v", err)
}
// Set up Watch for object "podFoo" with label filter set.
selector := labels.SelectorFromSet(labels.Set{"filter": "foo"})
filterFunc := func(obj runtime.Object) bool {
metadata, err := meta.Accessor(obj)
if err != nil {
t.Errorf("Unexpected error: %v", err)
return false
}
return selector.Matches(labels.Set(metadata.GetLabels()))
}
filter := storage.NewSimpleFilter(filterFunc, storage.NoTriggerFunc)
watcher, err := cacher.Watch(context.TODO(), "pods/ns/foo", fooCreated.ResourceVersion, filter)
if err != nil {
t.Fatalf("Unexpected error: %v", err)
}
defer watcher.Stop()
verifyWatchEvent(t, watcher, watch.Deleted, podFooFiltered)
verifyWatchEvent(t, watcher, watch.Added, podFoo)
verifyWatchEvent(t, watcher, watch.Modified, podFooPrime)
verifyWatchEvent(t, watcher, watch.Deleted, podFooPrime)
}
func TestStartingResourceVersion(t *testing.T) {
server, etcdStorage := newEtcdTestStorage(t, testapi.Default.Codec(), etcdtest.PathPrefix())
defer server.Terminate(t)
cacher := newTestCacher(etcdStorage)
defer cacher.Stop()
// add 1 object
podFoo := makeTestPod("foo")
fooCreated := updatePod(t, etcdStorage, podFoo, nil)
// Set up Watch starting at fooCreated.ResourceVersion + 10
rv, err := storage.ParseWatchResourceVersion(fooCreated.ResourceVersion)
if err != nil {
t.Fatalf("Unexpected error: %v", err)
}
rv += 10
startVersion := strconv.Itoa(int(rv))
watcher, err := cacher.Watch(context.TODO(), "pods/ns/foo", startVersion, storage.Everything)
if err != nil {
t.Fatalf("Unexpected error: %v", err)
}
defer watcher.Stop()
lastFoo := fooCreated
for i := 0; i < 11; i++ {
podFooForUpdate := makeTestPod("foo")
podFooForUpdate.Labels = map[string]string{"foo": strconv.Itoa(i)}
lastFoo = updatePod(t, etcdStorage, podFooForUpdate, lastFoo)
}
select {
case e := <-watcher.ResultChan():
pod := e.Object.(*api.Pod)
podRV, err := storage.ParseWatchResourceVersion(pod.ResourceVersion)
if err != nil {
t.Fatalf("unexpected error: %v", err)
}
// event should have at least rv + 1, since we're starting the watch at rv
if podRV <= rv {
t.Errorf("expected event with resourceVersion of at least %d, got %d", rv+1, podRV)
}
case <-time.After(wait.ForeverTestTimeout):
t.Errorf("timed out waiting for event")
}
}