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Merge pull request #120971 from p0lyn0mial/upstream-watchlist-client-go-fallback-integration
integration/apimachinery: add TestReflectorWatchListFallback integration test
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158
test/integration/apimachinery/watchlist_test.go
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158
test/integration/apimachinery/watchlist_test.go
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/*
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Copyright 2023 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 apimachinery
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import (
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"context"
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"fmt"
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"sort"
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"testing"
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"time"
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"github.com/stretchr/testify/require"
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"github.com/google/go-cmp/cmp"
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v1 "k8s.io/api/core/v1"
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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/wait"
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"k8s.io/apimachinery/pkg/watch"
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"k8s.io/client-go/kubernetes"
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"k8s.io/client-go/tools/cache"
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kubeapiservertesting "k8s.io/kubernetes/cmd/kube-apiserver/app/testing"
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"k8s.io/kubernetes/test/integration/framework"
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)
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func TestReflectorWatchListFallback(t *testing.T) {
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ctx := context.TODO()
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t.Log("Starting etcd that will be used by two different instances of kube-apiserver")
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etcdURL, etcdTearDownFn, err := framework.RunCustomEtcd("etcd_watchlist", []string{"--experimental-watch-progress-notify-interval", "1s"}, nil)
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require.NoError(t, err)
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defer etcdTearDownFn()
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etcdOptions := framework.DefaultEtcdOptions()
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etcdOptions.StorageConfig.Transport.ServerList = []string{etcdURL}
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t.Log("Starting the first server with the WatchList feature enabled")
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server1 := kubeapiservertesting.StartTestServerOrDie(t, nil, []string{"--feature-gates=WatchList=true"}, &etcdOptions.StorageConfig)
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defer server1.TearDownFn()
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clientSet, err := kubernetes.NewForConfig(server1.ClientConfig)
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require.NoError(t, err)
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ns := framework.CreateNamespaceOrDie(clientSet, "reflector-fallback-watchlist", t)
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defer framework.DeleteNamespaceOrDie(clientSet, ns, t)
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t.Logf("Adding 5 secrets to %s namespace", ns.Name)
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for i := 1; i <= 5; i++ {
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_, err := clientSet.CoreV1().Secrets(ns.Name).Create(ctx, newSecret(fmt.Sprintf("secret-%d", i)), metav1.CreateOptions{})
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require.NoError(t, err)
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}
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t.Log("Creating a secret reflector that will use the WatchList feature to synchronise the store")
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store := &wrappedStore{Store: cache.NewStore(cache.DeletionHandlingMetaNamespaceKeyFunc)}
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lw := &wrappedListWatch{&cache.ListWatch{}}
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lw.SetClient(ctx, clientSet, ns)
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target := cache.NewReflector(lw, &v1.Secret{}, store, time.Duration(0))
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target.UseWatchList = true
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t.Log("Waiting until the secret reflector synchronises to the store (call to the Replace method)")
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reflectorCtx, reflectorCtxCancel := context.WithCancel(context.Background())
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defer reflectorCtxCancel()
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store.setCancelOnReplace(reflectorCtxCancel)
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err = target.ListAndWatch(reflectorCtx.Done())
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require.NoError(t, err)
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t.Log("Verifying if the secret reflector was properly synchronised")
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verifyStore(t, ctx, clientSet, store, ns)
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t.Log("Starting the second server with the WatchList feature disabled")
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server2 := kubeapiservertesting.StartTestServerOrDie(t, nil, []string{"--feature-gates=WatchList=false"}, &etcdOptions.StorageConfig)
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defer server2.TearDownFn()
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clientSet2, err := kubernetes.NewForConfig(server2.ClientConfig)
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require.NoError(t, err)
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t.Log("Pointing the ListWatcher used by the secret reflector to the second server (with the WatchList feature disabled)")
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lw.SetClient(ctx, clientSet2, ns)
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reflectorCtx, reflectorCtxCancel = context.WithCancel(context.Background())
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defer reflectorCtxCancel()
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store.setCancelOnReplace(reflectorCtxCancel)
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err = target.ListAndWatch(reflectorCtx.Done())
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require.NoError(t, err)
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t.Log("Verifying if the secret reflector was properly synchronised")
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verifyStore(t, ctx, clientSet, store, ns)
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}
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// TODO(#115478): refactor with e2e/apimachinery/watchlist
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func verifyStore(t *testing.T, ctx context.Context, clientSet kubernetes.Interface, store cache.Store, namespace *v1.Namespace) {
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t.Logf("Listing secrets directly from the server from %s namespace", namespace.Name)
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expectedSecretsList, err := clientSet.CoreV1().Secrets(namespace.Name).List(ctx, metav1.ListOptions{})
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require.NoError(t, err)
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expectedSecrets := expectedSecretsList.Items
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err = wait.PollUntilContextTimeout(ctx, 100*time.Millisecond, wait.ForeverTestTimeout, true, func(ctx context.Context) (done bool, err error) {
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t.Log("Comparing secrets retrieved directly from the server with the ones that have been streamed to the secret reflector")
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rawStreamedSecrets := store.List()
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streamedSecrets := make([]v1.Secret, 0, len(rawStreamedSecrets))
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for _, rawSecret := range rawStreamedSecrets {
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streamedSecrets = append(streamedSecrets, *rawSecret.(*v1.Secret))
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}
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sort.Sort(byName(expectedSecrets))
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sort.Sort(byName(streamedSecrets))
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return cmp.Equal(expectedSecrets, streamedSecrets), nil
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})
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require.NoError(t, err)
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}
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type byName []v1.Secret
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func (a byName) Len() int { return len(a) }
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func (a byName) Less(i, j int) bool { return a[i].Name < a[j].Name }
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func (a byName) Swap(i, j int) { a[i], a[j] = a[j], a[i] }
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func newSecret(name string) *v1.Secret {
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return &v1.Secret{
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ObjectMeta: metav1.ObjectMeta{Name: name},
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}
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}
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type wrappedStore struct {
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cache.Store
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ctxCancel context.CancelFunc
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}
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func (s *wrappedStore) Replace(items []interface{}, rv string) error {
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s.ctxCancel()
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return s.Store.Replace(items, rv)
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}
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func (s *wrappedStore) setCancelOnReplace(ctxCancel context.CancelFunc) {
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s.ctxCancel = ctxCancel
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}
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type wrappedListWatch struct {
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*cache.ListWatch
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}
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func (lw *wrappedListWatch) SetClient(ctx context.Context, clientSet kubernetes.Interface, ns *v1.Namespace) {
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lw.ListFunc = func(options metav1.ListOptions) (runtime.Object, error) {
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return clientSet.CoreV1().Secrets(ns.Name).List(ctx, options)
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}
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lw.WatchFunc = func(options metav1.ListOptions) (watch.Interface, error) {
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return clientSet.CoreV1().Secrets(ns.Name).Watch(ctx, options)
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}
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}
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