Implement Cacher for watch in apiserver
This commit is contained in:
Wojciech Tyczynski
337
pkg/storage/cacher_test.go
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337
pkg/storage/cacher_test.go
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/*
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Copyright 2015 The Kubernetes Authors All rights reserved.
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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 storage_test
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import (
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"fmt"
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"reflect"
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"testing"
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"time"
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"github.com/coreos/go-etcd/etcd"
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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/runtime"
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"k8s.io/kubernetes/pkg/storage"
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etcdstorage "k8s.io/kubernetes/pkg/storage/etcd"
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"k8s.io/kubernetes/pkg/tools"
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"k8s.io/kubernetes/pkg/tools/etcdtest"
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"k8s.io/kubernetes/pkg/util"
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"k8s.io/kubernetes/pkg/util/wait"
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"k8s.io/kubernetes/pkg/watch"
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)
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func newTestCacher(client tools.EtcdClient) *storage.Cacher {
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prefix := "pods"
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config := storage.CacherConfig{
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CacheCapacity: 10,
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Versioner: etcdstorage.APIObjectVersioner{},
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Storage: etcdstorage.NewEtcdStorage(client, testapi.Codec(), etcdtest.PathPrefix()),
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Type: &api.Pod{},
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ResourcePrefix: prefix,
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KeyFunc: func(obj runtime.Object) (string, error) { return storage.NamespaceKeyFunc(prefix, obj) },
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NewListFunc: func() runtime.Object { return &api.PodList{} },
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StopChannel: util.NeverStop,
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}
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return storage.NewCacher(config)
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}
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func makeTestPod(name string) *api.Pod {
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return &api.Pod{
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ObjectMeta: api.ObjectMeta{Namespace: "ns", Name: name},
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Spec: api.PodSpec{
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DNSPolicy: api.DNSClusterFirst,
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RestartPolicy: api.RestartPolicyAlways,
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},
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}
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}
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func waitForUpToDateCache(cacher *storage.Cacher, resourceVersion uint64) error {
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ready := func() (bool, error) {
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result, err := cacher.LastSyncResourceVersion()
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if err != nil {
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return false, err
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}
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return result == resourceVersion, nil
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}
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return wait.Poll(10*time.Millisecond, 100*time.Millisecond, ready)
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}
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func TestList(t *testing.T) {
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fakeClient := tools.NewFakeEtcdClient(t)
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prefixedKey := etcdtest.AddPrefix("pods")
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fakeClient.ExpectNotFoundGet(prefixedKey)
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cacher := newTestCacher(fakeClient)
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fakeClient.WaitForWatchCompletion()
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podFoo := makeTestPod("foo")
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podBar := makeTestPod("bar")
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podBaz := makeTestPod("baz")
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podFooPrime := makeTestPod("foo")
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podFooPrime.Spec.NodeName = "fakeNode"
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testCases := []*etcd.Response{
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{
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Action: "create",
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Node: &etcd.Node{
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Value: string(runtime.EncodeOrDie(testapi.Codec(), podFoo)),
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CreatedIndex: 1,
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ModifiedIndex: 1,
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},
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},
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{
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Action: "create",
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Node: &etcd.Node{
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Value: string(runtime.EncodeOrDie(testapi.Codec(), podBar)),
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CreatedIndex: 2,
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ModifiedIndex: 2,
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},
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},
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{
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Action: "create",
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Node: &etcd.Node{
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Value: string(runtime.EncodeOrDie(testapi.Codec(), podBaz)),
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CreatedIndex: 3,
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ModifiedIndex: 3,
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},
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},
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{
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Action: "set",
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Node: &etcd.Node{
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Value: string(runtime.EncodeOrDie(testapi.Codec(), podFooPrime)),
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CreatedIndex: 1,
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ModifiedIndex: 4,
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},
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PrevNode: &etcd.Node{
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Value: string(runtime.EncodeOrDie(testapi.Codec(), podFoo)),
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CreatedIndex: 1,
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ModifiedIndex: 1,
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},
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},
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{
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Action: "delete",
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Node: &etcd.Node{
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CreatedIndex: 1,
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ModifiedIndex: 5,
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},
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PrevNode: &etcd.Node{
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Value: string(runtime.EncodeOrDie(testapi.Codec(), podBar)),
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CreatedIndex: 1,
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ModifiedIndex: 1,
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},
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},
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}
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// Propagate some data to etcd.
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for _, test := range testCases {
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fakeClient.WatchResponse <- test
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}
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if err := waitForUpToDateCache(cacher, 5); err != nil {
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t.Errorf("watch cache didn't propagated correctly: %v", err)
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}
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result := &api.PodList{}
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if err := cacher.List("pods/ns", result); err != nil {
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t.Errorf("unexpected error: %v", err)
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}
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if result.ListMeta.ResourceVersion != "5" {
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t.Errorf("incorrect resource version: %v", result.ListMeta.ResourceVersion)
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}
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if len(result.Items) != 2 {
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t.Errorf("unexpected list result: %d", len(result.Items))
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}
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keys := util.StringSet{}
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for _, item := range result.Items {
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keys.Insert(item.ObjectMeta.Name)
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}
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if !keys.HasAll("foo", "baz") {
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t.Errorf("unexpected list result: %#v", result)
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}
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for _, item := range result.Items {
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// unset fields that are set by the infrastructure
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item.ObjectMeta.ResourceVersion = ""
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item.ObjectMeta.CreationTimestamp = util.Time{}
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var expected *api.Pod
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switch item.ObjectMeta.Name {
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case "foo":
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expected = podFooPrime
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case "baz":
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expected = podBaz
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default:
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t.Errorf("unexpected item: %v", item)
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}
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if e, a := *expected, item; !reflect.DeepEqual(e, a) {
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t.Errorf("expected: %#v, got: %#v", e, a)
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}
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}
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close(fakeClient.WatchResponse)
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}
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func TestWatch(t *testing.T) {
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fakeClient := tools.NewFakeEtcdClient(t)
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prefixedKey := etcdtest.AddPrefix("pods")
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fakeClient.ExpectNotFoundGet(prefixedKey)
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cacher := newTestCacher(fakeClient)
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fakeClient.WaitForWatchCompletion()
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podFoo := makeTestPod("foo")
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podBar := makeTestPod("bar")
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testCases := []struct {
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object *api.Pod
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etcdResponse *etcd.Response
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event watch.EventType
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filtered bool
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}{
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{
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object: podFoo,
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etcdResponse: &etcd.Response{
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Action: "create",
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Node: &etcd.Node{
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Value: string(runtime.EncodeOrDie(testapi.Codec(), podFoo)),
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CreatedIndex: 1,
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ModifiedIndex: 1,
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},
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},
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event: watch.Added,
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filtered: true,
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},
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{
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object: podBar,
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etcdResponse: &etcd.Response{
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Action: "create",
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Node: &etcd.Node{
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Value: string(runtime.EncodeOrDie(testapi.Codec(), podBar)),
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CreatedIndex: 2,
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ModifiedIndex: 2,
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},
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},
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event: watch.Added,
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filtered: false,
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},
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{
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object: podFoo,
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etcdResponse: &etcd.Response{
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Action: "set",
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Node: &etcd.Node{
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Value: string(runtime.EncodeOrDie(testapi.Codec(), podFoo)),
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CreatedIndex: 1,
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ModifiedIndex: 3,
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},
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PrevNode: &etcd.Node{
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Value: string(runtime.EncodeOrDie(testapi.Codec(), podFoo)),
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CreatedIndex: 1,
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ModifiedIndex: 1,
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},
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},
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event: watch.Modified,
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filtered: true,
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},
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}
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// Set up Watch for object "podFoo".
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watcher, err := cacher.Watch("pods/ns/foo", 1, storage.Everything)
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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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for _, test := range testCases {
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fakeClient.WatchResponse <- test.etcdResponse
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if test.filtered {
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event := <-watcher.ResultChan()
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if e, a := test.event, event.Type; e != a {
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t.Errorf("%v %v", e, a)
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}
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// unset fields that are set by the infrastructure
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obj := event.Object.(*api.Pod)
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obj.ObjectMeta.ResourceVersion = ""
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obj.ObjectMeta.CreationTimestamp = util.Time{}
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if e, a := test.object, obj; !reflect.DeepEqual(e, a) {
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t.Errorf("expected: %#v, got: %#v", e, a)
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}
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}
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}
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// Check whether we get too-old error.
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_, err = cacher.Watch("pods/ns/foo", 0, storage.Everything)
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if err == nil {
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t.Errorf("expected 'error too old' error")
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}
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// Now test watch with initial state.
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initialWatcher, err := cacher.Watch("pods/ns/foo", 1, storage.Everything)
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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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for _, test := range testCases {
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if test.filtered {
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event := <-initialWatcher.ResultChan()
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if e, a := test.event, event.Type; e != a {
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t.Errorf("%v %v", e, a)
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}
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// unset fields that are set by the infrastructure
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obj := event.Object.(*api.Pod)
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obj.ObjectMeta.ResourceVersion = ""
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obj.ObjectMeta.CreationTimestamp = util.Time{}
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if e, a := test.object, obj; !reflect.DeepEqual(e, a) {
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t.Errorf("expected: %#v, got: %#v", e, a)
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}
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}
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}
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close(fakeClient.WatchResponse)
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}
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func TestStorageError(t *testing.T) {
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fakeClient := tools.NewFakeEtcdClient(t)
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prefixedKey := etcdtest.AddPrefix("pods")
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fakeClient.ExpectNotFoundGet(prefixedKey)
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cacher := newTestCacher(fakeClient)
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fakeClient.WaitForWatchCompletion()
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podFoo := makeTestPod("foo")
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// Set up Watch for object "podFoo".
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watcher, err := cacher.Watch("pods/ns/foo", 1, storage.Everything)
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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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fakeClient.WatchResponse <- &etcd.Response{
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Action: "create",
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Node: &etcd.Node{
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Value: string(runtime.EncodeOrDie(testapi.Codec(), podFoo)),
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CreatedIndex: 1,
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ModifiedIndex: 1,
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},
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}
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_ = <-watcher.ResultChan()
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// Injecting error is simulating error from etcd.
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// This is almost the same what would happen e.g. in case of
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// "error too old" when reconnecting to etcd watch.
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fakeClient.WatchInjectError <- fmt.Errorf("fake error")
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_, ok := <-watcher.ResultChan()
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if ok {
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t.Errorf("unexpected event")
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}
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}
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