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7dddf976b8
Note that the fake client isn't designed to work with informer. It doesn't support resource version. It's encouraged to use a real client in an integration/E2E test if you need to test complex behavior with informer/controllers. Kubernetes-commit: 942bc9b32e39bb9c6ca045c02b48cc84dfa86633
97 lines
3.3 KiB
Go
97 lines
3.3 KiB
Go
/*
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Copyright 2018 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 fakeclient
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import (
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"context"
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"testing"
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"time"
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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/util/wait"
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"k8s.io/apimachinery/pkg/watch"
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"k8s.io/client-go/informers"
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"k8s.io/client-go/kubernetes/fake"
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clienttesting "k8s.io/client-go/testing"
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"k8s.io/client-go/tools/cache"
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)
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// TestFakeClient demonstrates how to use a fake client with SharedInformerFactory in tests.
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func TestFakeClient(t *testing.T) {
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ctx, cancel := context.WithCancel(context.Background())
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defer cancel()
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watcherStarted := make(chan struct{})
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// Create the fake client.
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client := fake.NewSimpleClientset()
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// A catch-all watch reactor that allows us to inject the watcherStarted channel.
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client.PrependWatchReactor("*", func(action clienttesting.Action) (handled bool, ret watch.Interface, err error) {
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gvr := action.GetResource()
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ns := action.GetNamespace()
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watch, err := client.Tracker().Watch(gvr, ns)
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if err != nil {
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return false, nil, err
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}
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close(watcherStarted)
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return true, watch, nil
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})
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// We will create an informer that writes added pods to a channel.
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pods := make(chan *v1.Pod, 1)
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informers := informers.NewSharedInformerFactory(client, 0)
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podInformer := informers.Core().V1().Pods().Informer()
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podInformer.AddEventHandler(&cache.ResourceEventHandlerFuncs{
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AddFunc: func(obj interface{}) {
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pod := obj.(*v1.Pod)
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t.Logf("pod added: %s/%s", pod.Namespace, pod.Name)
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pods <- pod
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},
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})
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// Make sure informers are running.
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informers.Start(ctx.Done())
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// This is not required in tests, but it serves as a proof-of-concept by
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// ensuring that the informer goroutine have warmed up and called List before
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// we send any events to it.
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cache.WaitForCacheSync(ctx.Done(), podInformer.HasSynced)
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// The fake client doesn't support resource version. Any writes to the client
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// after the informer's initial LIST and before the informer establishing the
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// watcher will be missed by the informer. Therefore we wait until the watcher
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// starts.
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// Note that the fake client isn't designed to work with informer. It
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// doesn't support resource version. It's encouraged to use a real client
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// in an integration/E2E test if you need to test complex behavior with
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// informer/controllers.
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<-watcherStarted
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// Inject an event into the fake client.
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p := &v1.Pod{ObjectMeta: metav1.ObjectMeta{Name: "my-pod"}}
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_, err := client.CoreV1().Pods("test-ns").Create(context.TODO(), p, metav1.CreateOptions{})
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if err != nil {
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t.Fatalf("error injecting pod add: %v", err)
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}
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select {
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case pod := <-pods:
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t.Logf("Got pod from channel: %s/%s", pod.Namespace, pod.Name)
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case <-time.After(wait.ForeverTestTimeout):
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t.Error("Informer did not get the added pod")
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}
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}
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