istio.io/istio@v0.0.0-20240520182934-d79c90f27776/pkg/kube/watcher/configmapwatcher/configmapwatcher_test.go (about)

     1  // Copyright Istio Authors.
     2  //
     3  // Licensed under the Apache License, Version 2.0 (the "License");
     4  // you may not use this file except in compliance with the License.
     5  // You may obtain a copy of the License at
     6  //
     7  //     http://www.apache.org/licenses/LICENSE-2.0
     8  //
     9  // Unless required by applicable law or agreed to in writing, software
    10  // distributed under the License is distributed on an "AS IS" BASIS,
    11  // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    12  // See the License for the specific language governing permissions and
    13  // limitations under the License.
    14  
    15  package configmapwatcher
    16  
    17  import (
    18  	"context"
    19  	"fmt"
    20  	"sync"
    21  	"testing"
    22  	"time"
    23  
    24  	. "github.com/onsi/gomega"
    25  	v1 "k8s.io/api/core/v1"
    26  	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
    27  
    28  	"istio.io/istio/pkg/kube"
    29  )
    30  
    31  const (
    32  	configMapNamespace string = "istio-system"
    33  	configMapName      string = "watched"
    34  )
    35  
    36  func makeConfigMap(name, resourceVersion string) *v1.ConfigMap {
    37  	return &v1.ConfigMap{
    38  		ObjectMeta: metav1.ObjectMeta{
    39  			Namespace:       configMapNamespace,
    40  			Name:            name,
    41  			ResourceVersion: resourceVersion,
    42  		},
    43  		Data: map[string]string{
    44  			"mesh": "trustDomain: cluster.local",
    45  		},
    46  	}
    47  }
    48  
    49  var (
    50  	mu     sync.Mutex
    51  	called bool
    52  	newCM  *v1.ConfigMap
    53  )
    54  
    55  func callback(cm *v1.ConfigMap) {
    56  	mu.Lock()
    57  	defer mu.Unlock()
    58  	called = true
    59  	newCM = cm
    60  }
    61  
    62  func getCalled() bool {
    63  	mu.Lock()
    64  	defer mu.Unlock()
    65  	return called
    66  }
    67  
    68  func getCM() *v1.ConfigMap {
    69  	mu.Lock()
    70  	defer mu.Unlock()
    71  	return newCM
    72  }
    73  
    74  func resetCalled() {
    75  	called = false
    76  	newCM = nil
    77  }
    78  
    79  func Test_ConfigMapWatcher(t *testing.T) {
    80  	client := kube.NewFakeClient()
    81  	cm := makeConfigMap(configMapName, "1")
    82  	cm1 := makeConfigMap(configMapName, "2")
    83  	cm2 := makeConfigMap("not-watched", "1")
    84  	steps := []struct {
    85  		added        *v1.ConfigMap
    86  		updated      *v1.ConfigMap
    87  		deleted      *v1.ConfigMap
    88  		expectCalled bool
    89  		expectCM     *v1.ConfigMap
    90  	}{
    91  		{added: cm2},
    92  		{added: cm, expectCalled: true, expectCM: cm},
    93  		{updated: cm},
    94  		{updated: cm1, expectCalled: true, expectCM: cm1},
    95  		{deleted: cm1, expectCalled: true},
    96  		{deleted: cm2},
    97  	}
    98  
    99  	stop := make(chan struct{})
   100  	c := NewController(client, configMapNamespace, configMapName, callback)
   101  	go c.Run(stop)
   102  	kube.WaitForCacheSync("test", stop, c.HasSynced)
   103  
   104  	cms := client.Kube().CoreV1().ConfigMaps(configMapNamespace)
   105  	for i, step := range steps {
   106  		resetCalled()
   107  
   108  		t.Run(fmt.Sprintf("[%v]", i), func(t *testing.T) {
   109  			g := NewWithT(t)
   110  
   111  			switch {
   112  			case step.added != nil:
   113  				_, err := cms.Create(context.TODO(), step.added, metav1.CreateOptions{})
   114  				g.Expect(err).Should(BeNil())
   115  			case step.updated != nil:
   116  				_, err := cms.Update(context.TODO(), step.updated, metav1.UpdateOptions{})
   117  				g.Expect(err).Should(BeNil())
   118  			case step.deleted != nil:
   119  				g.Expect(cms.Delete(context.TODO(), step.deleted.Name, metav1.DeleteOptions{})).
   120  					Should(Succeed())
   121  			}
   122  
   123  			if step.expectCalled {
   124  				g.Eventually(getCalled, time.Second).Should(Equal(true))
   125  				g.Eventually(getCM, time.Second).Should(Equal(newCM))
   126  			} else {
   127  				g.Consistently(getCalled).Should(Equal(false))
   128  			}
   129  		})
   130  	}
   131  }