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Merge pull request #42 from jetstack/stable-leader-election-id
Stable leader election
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,110 @@ | ||
| package leaderelection | ||
|
|
||
| import ( | ||
| "context" | ||
| "fmt" | ||
| "strings" | ||
| "time" | ||
|
|
||
| "github.com/jetstack/google-cas-issuer/test/e2e/framework" | ||
| . "github.com/onsi/ginkgo" | ||
| . "github.com/onsi/gomega" | ||
| corev1 "k8s.io/api/core/v1" | ||
| metav1 "k8s.io/apimachinery/pkg/apis/meta/v1" | ||
| "k8s.io/apimachinery/pkg/util/json" | ||
| "k8s.io/client-go/util/retry" | ||
| ) | ||
|
|
||
| type leaderElectionAnnotation struct { | ||
| HolderIdentity string `json:"holderIdentity"` | ||
| LeaseDurationSeconds int `json:"leaseDurationSeconds"` | ||
| AcquireTime time.Time `json:"acquireTime"` | ||
| RenewTime time.Time `json:"renewTime"` | ||
| LeaderTransitions int `json:"leaderTransitions"` | ||
| } | ||
|
|
||
| var _ = framework.CasesDescribe("leader election", func() { | ||
| f := framework.NewDefaultFramework("leader election") | ||
| It("Tests leader election", func() { | ||
| By("Waiting for all pods to be ready") | ||
| err := f.Helper().WaitForPodsReady(f.Config().Namespace, 10*time.Second) | ||
| Expect(err).NotTo(HaveOccurred()) | ||
| By("Finding all cas issuer leader election config maps") | ||
| findAllCASIssuerConfigMaps := func() ([]*corev1.ConfigMap, error) { | ||
| configMapList, err := f.KubeClientSet.CoreV1().ConfigMaps("cert-manager").List(context.TODO(), metav1.ListOptions{}) | ||
| if err != nil { | ||
| return nil, fmt.Errorf("couldn't retrieve a list of config maps: %w", err) | ||
| } | ||
| var configMaps []*corev1.ConfigMap | ||
| for _, cm := range configMapList.Items { | ||
| if leaderAnnotationJSON, found := cm.Annotations["control-plane.alpha.kubernetes.io/leader"]; found { | ||
| leaderInfo := new(leaderElectionAnnotation) | ||
| if err := json.Unmarshal([]byte(leaderAnnotationJSON), leaderInfo); err != nil { | ||
| return nil, err | ||
| } | ||
| if strings.HasPrefix(leaderInfo.HolderIdentity, "google-cas-issuer") { | ||
| configMaps = append(configMaps, &cm) | ||
| } | ||
| } | ||
| } | ||
| return configMaps, nil | ||
| } | ||
|
|
||
| configMaps, err := findAllCASIssuerConfigMaps() | ||
| Expect(err).NotTo(HaveOccurred()) | ||
| By("Expecting only one config map pointing to a google CAS issuer") | ||
| Expect(configMaps).Should(HaveLen(1)) | ||
|
|
||
| By("Scaling google cas issuer to 3 replicas") | ||
| err = retry.RetryOnConflict(retry.DefaultRetry, func() error { | ||
| deployment, err := f.KubeClientSet.AppsV1().Deployments("cert-manager").Get(context.TODO(), "google-cas-issuer", metav1.GetOptions{}) | ||
| if err != nil { | ||
| return err | ||
| } | ||
| want3Replicas := int32(3) | ||
| newDeployment := deployment.DeepCopy() | ||
| newDeployment.Spec.Replicas = &want3Replicas | ||
| _, err = f.KubeClientSet.AppsV1().Deployments("cert-manager").Update(context.TODO(), newDeployment, metav1.UpdateOptions{}) | ||
| if err != nil { | ||
| return err | ||
| } | ||
| return nil | ||
| }) | ||
| Expect(err).NotTo(HaveOccurred()) | ||
|
|
||
| By("Waiting for all pods to be ready") | ||
| err = f.Helper().WaitForPodsReady(f.Config().Namespace, 10*time.Second) | ||
| Expect(err).NotTo(HaveOccurred()) | ||
|
|
||
| By("Ensuring there is still a single config map") | ||
| configMaps, err = findAllCASIssuerConfigMaps() | ||
| Expect(err).NotTo(HaveOccurred()) | ||
| Expect(configMaps).Should(HaveLen(1)) | ||
|
|
||
| By("Scaling google cas issuer to 1 replicas") | ||
| err = retry.RetryOnConflict(retry.DefaultRetry, func() error { | ||
| deployment, err := f.KubeClientSet.AppsV1().Deployments("cert-manager").Get(context.TODO(), "google-cas-issuer", metav1.GetOptions{}) | ||
| if err != nil { | ||
| return err | ||
| } | ||
| newDeployment := deployment.DeepCopy() | ||
| want1Replica := int32(1) | ||
| newDeployment.Spec.Replicas = &want1Replica | ||
| _, err = f.KubeClientSet.AppsV1().Deployments("cert-manager").Update(context.TODO(), newDeployment, metav1.UpdateOptions{}) | ||
| if err != nil { | ||
| return err | ||
| } | ||
| return nil | ||
| }) | ||
| Expect(err).NotTo(HaveOccurred()) | ||
|
|
||
| By("Waiting for all pods to be ready") | ||
| err = f.Helper().WaitForPodsReady(f.Config().Namespace, 10*time.Second) | ||
| Expect(err).NotTo(HaveOccurred()) | ||
|
|
||
| By("Ensuring there is still a single config map") | ||
| configMaps, err = findAllCASIssuerConfigMaps() | ||
| Expect(err).NotTo(HaveOccurred()) | ||
| Expect(configMaps).Should(HaveLen(1)) | ||
| }) | ||
| }) |
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