Golang Interface.Discovery方法代碼示例

// RunNamespaceController starts the Kubernetes Namespace Manager
func (c *MasterConfig) RunNamespaceController(kubeClient internalclientset.Interface, clientPool dynamic.ClientPool) {
	// Find the list of namespaced resources via discovery that the namespace controller must manage
	groupVersionResources, err := kubeClient.Discovery().ServerPreferredNamespacedResources()
	if err != nil {
		glog.Fatalf("Failed to get supported resources from server: %v", err)
	}
	namespaceController := namespacecontroller.NewNamespaceController(kubeClient, clientPool, groupVersionResources, c.ControllerManager.NamespaceSyncPeriod.Duration, kapi.FinalizerKubernetes)
	go namespaceController.Run(int(c.ControllerManager.ConcurrentNamespaceSyncs), utilwait.NeverStop)
}

func checkMasterVersion(c clientset.Interface, want string) error {
	framework.Logf("Checking master version")
	v, err := c.Discovery().ServerVersion()
	if err != nil {
		return fmt.Errorf("checkMasterVersion() couldn't get the master version: %v", err)
	}
	// We do prefix trimming and then matching because:
	// want looks like:  0.19.3-815-g50e67d4
	// got  looks like: v0.19.3-815-g50e67d4034e858-dirty
	got := strings.TrimPrefix(v.GitVersion, "v")
	if !strings.HasPrefix(got, want) {
		return fmt.Errorf("master had kube-apiserver version %s which does not start with %s",
			got, want)
	}
	framework.Logf("Master is at version %s", want)
	return nil
}

func testPreStop(c clientset.Interface, ns string) {
	// This is the server that will receive the preStop notification
	podDescr := &api.Pod{
		ObjectMeta: api.ObjectMeta{
			Name: "server",
		},
		Spec: api.PodSpec{
			Containers: []api.Container{
				{
					Name:  "server",
					Image: "gcr.io/google_containers/nettest:1.7",
					Ports: []api.ContainerPort{{ContainerPort: 8080}},
				},
			},
		},
	}
	By(fmt.Sprintf("Creating server pod %s in namespace %s", podDescr.Name, ns))
	podDescr, err := c.Core().Pods(ns).Create(podDescr)
	framework.ExpectNoError(err, fmt.Sprintf("creating pod %s", podDescr.Name))

	// At the end of the test, clean up by removing the pod.
	defer func() {
		By("Deleting the server pod")
		c.Core().Pods(ns).Delete(podDescr.Name, nil)
	}()

	By("Waiting for pods to come up.")
	err = framework.WaitForPodRunningInNamespace(c, podDescr)
	framework.ExpectNoError(err, "waiting for server pod to start")

	val := "{\"Source\": \"prestop\"}"

	podOut, err := c.Core().Pods(ns).Get(podDescr.Name)
	framework.ExpectNoError(err, "getting pod info")

	preStopDescr := &api.Pod{
		ObjectMeta: api.ObjectMeta{
			Name: "tester",
		},
		Spec: api.PodSpec{
			Containers: []api.Container{
				{
					Name:    "tester",
					Image:   "gcr.io/google_containers/busybox:1.24",
					Command: []string{"sleep", "600"},
					Lifecycle: &api.Lifecycle{
						PreStop: &api.Handler{
							Exec: &api.ExecAction{
								Command: []string{
									"wget", "-O-", "--post-data=" + val, fmt.Sprintf("http://%s:8080/write", podOut.Status.PodIP),
								},
							},
						},
					},
				},
			},
		},
	}

	By(fmt.Sprintf("Creating tester pod %s in namespace %s", preStopDescr.Name, ns))
	preStopDescr, err = c.Core().Pods(ns).Create(preStopDescr)
	framework.ExpectNoError(err, fmt.Sprintf("creating pod %s", preStopDescr.Name))
	deletePreStop := true

	// At the end of the test, clean up by removing the pod.
	defer func() {
		if deletePreStop {
			By("Deleting the tester pod")
			c.Core().Pods(ns).Delete(preStopDescr.Name, nil)
		}
	}()

	err = framework.WaitForPodRunningInNamespace(c, preStopDescr)
	framework.ExpectNoError(err, "waiting for tester pod to start")

	// Delete the pod with the preStop handler.
	By("Deleting pre-stop pod")
	if err := c.Core().Pods(ns).Delete(preStopDescr.Name, nil); err == nil {
		deletePreStop = false
	}
	framework.ExpectNoError(err, fmt.Sprintf("deleting pod: %s", preStopDescr.Name))

	// Validate that the server received the web poke.
	err = wait.Poll(time.Second*5, time.Second*60, func() (bool, error) {
		subResourceProxyAvailable, err := framework.ServerVersionGTE(framework.SubResourcePodProxyVersion, c.Discovery())
		if err != nil {
			return false, err
		}
		var body []byte
		if subResourceProxyAvailable {
			body, err = c.Core().RESTClient().Get().
				Namespace(ns).
				Resource("pods").
				SubResource("proxy").
				Name(podDescr.Name).
				Suffix("read").
				DoRaw()
		} else {
			body, err = c.Core().RESTClient().Get().
				Prefix("proxy").
//.........這裏部分代碼省略.........

func assertFilesContain(fileNames []string, fileDir string, pod *api.Pod, client clientset.Interface, check bool, expected string) {
	var failed []string

	framework.ExpectNoError(wait.Poll(time.Second*2, time.Second*60, func() (bool, error) {
		failed = []string{}
		subResourceProxyAvailable, err := framework.ServerVersionGTE(framework.SubResourcePodProxyVersion, client.Discovery())
		if err != nil {
			return false, err
		}
		var contents []byte
		for _, fileName := range fileNames {
			if subResourceProxyAvailable {
				contents, err = client.Core().RESTClient().Get().
					Namespace(pod.Namespace).
					Resource("pods").
					SubResource("proxy").
					Name(pod.Name).
					Suffix(fileDir, fileName).
					Do().Raw()
			} else {
				contents, err = client.Core().RESTClient().Get().
					Prefix("proxy").
					Resource("pods").
					Namespace(pod.Namespace).
					Name(pod.Name).
					Suffix(fileDir, fileName).
					Do().Raw()
			}
			if err != nil {
				framework.Logf("Unable to read %s from pod %s: %v", fileName, pod.Name, err)
				failed = append(failed, fileName)
			} else if check && strings.TrimSpace(string(contents)) != expected {
				framework.Logf("File %s from pod %s contains '%s' instead of '%s'", fileName, pod.Name, string(contents), expected)
				failed = append(failed, fileName)
			}
		}
		if len(failed) == 0 {
			return true, nil
		}
		framework.Logf("Lookups using %s failed for: %v\n", pod.Name, failed)
		return false, nil
	}))
	Expect(len(failed)).To(Equal(0))
}

// deleteAllContent will delete all content known to the system in a namespace. It returns an estimate
// of the time remaining before the remaining resources are deleted. If estimate > 0 not all resources
// are guaranteed to be gone.
func deleteAllContent(kubeClient clientset.Interface, versions *unversioned.APIVersions, namespace string, before unversioned.Time) (estimate int64, err error) {
	err = deleteServiceAccounts(kubeClient, namespace)
	if err != nil {
		return estimate, err
	}
	err = deleteServices(kubeClient, namespace)
	if err != nil {
		return estimate, err
	}
	err = deleteReplicationControllers(kubeClient, namespace)
	if err != nil {
		return estimate, err
	}
	estimate, err = deletePods(kubeClient, namespace, before)
	if err != nil {
		return estimate, err
	}
	err = deleteSecrets(kubeClient, namespace)
	if err != nil {
		return estimate, err
	}
	err = deletePersistentVolumeClaims(kubeClient, namespace)
	if err != nil {
		return estimate, err
	}
	err = deleteLimitRanges(kubeClient, namespace)
	if err != nil {
		return estimate, err
	}
	err = deleteResourceQuotas(kubeClient, namespace)
	if err != nil {
		return estimate, err
	}
	err = deleteEvents(kubeClient, namespace)
	if err != nil {
		return estimate, err
	}
	// If experimental mode, delete all experimental resources for the namespace.
	if containsVersion(versions, "extensions/v1beta1") {
		resources, err := kubeClient.Discovery().ServerResourcesForGroupVersion("extensions/v1beta1")
		if err != nil {
			return estimate, err
		}
		if containsResource(resources, "horizontalpodautoscalers") {
			err = deleteHorizontalPodAutoscalers(kubeClient.Extensions(), namespace)
			if err != nil {
				return estimate, err
			}
		}
		if containsResource(resources, "ingresses") {
			err = deleteIngress(kubeClient.Extensions(), namespace)
			if err != nil {
				return estimate, err
			}
		}
		if containsResource(resources, "daemonsets") {
			err = deleteDaemonSets(kubeClient.Extensions(), namespace)
			if err != nil {
				return estimate, err
			}
		}
		if containsResource(resources, "jobs") {
			err = deleteJobs(kubeClient.Extensions(), namespace)
			if err != nil {
				return estimate, err
			}
		}
		if containsResource(resources, "deployments") {
			err = deleteDeployments(kubeClient.Extensions(), namespace)
			if err != nil {
				return estimate, err
			}
		}
		if containsResource(resources, "replicasets") {
			err = deleteReplicaSets(kubeClient.Extensions(), namespace)
			if err != nil {
				return estimate, err
			}
		}
	}
	return estimate, nil
}

func getNodeStatsSummary(c clientset.Interface, nodeName string) (*stats.Summary, error) {
	subResourceProxyAvailable, err := ServerVersionGTE(subResourceServiceAndNodeProxyVersion, c.Discovery())
	if err != nil {
		return nil, err
	}

	var data []byte
	if subResourceProxyAvailable {
		data, err = c.Core().RESTClient().Get().
			Resource("nodes").
			SubResource("proxy").
			Name(fmt.Sprintf("%v:%v", nodeName, ports.KubeletPort)).
			Suffix("stats/summary").
			SetHeader("Content-Type", "application/json").
			Do().Raw()

	} else {
		data, err = c.Core().RESTClient().Get().
			Prefix("proxy").
			Resource("nodes").
			Name(fmt.Sprintf("%v:%v", nodeName, ports.KubeletPort)).
			Suffix("stats/summary").
			SetHeader("Content-Type", "application/json").
			Do().Raw()
	}
	if err != nil {
		return nil, err
	}

	var summary *stats.Summary
	err = json.Unmarshal(data, &summary)
	if err != nil {
		return nil, err
	}
	return summary, nil
}

// getContainerInfo contacts kubelet for the container information. The "Stats"
// in the returned ContainerInfo is subject to the requirements in statsRequest.
// TODO: This function uses the deprecated kubelet stats API; it should be
// removed.
func getContainerInfo(c clientset.Interface, nodeName string, req *kubeletstats.StatsRequest) (map[string]cadvisorapi.ContainerInfo, error) {
	reqBody, err := json.Marshal(req)
	if err != nil {
		return nil, err
	}
	subResourceProxyAvailable, err := ServerVersionGTE(subResourceServiceAndNodeProxyVersion, c.Discovery())
	if err != nil {
		return nil, err
	}

	var data []byte
	if subResourceProxyAvailable {
		data, err = c.Core().RESTClient().Post().
			Resource("nodes").
			SubResource("proxy").
			Name(fmt.Sprintf("%v:%v", nodeName, ports.KubeletPort)).
			Suffix("stats/container").
			SetHeader("Content-Type", "application/json").
			Body(reqBody).
			Do().Raw()

	} else {
		data, err = c.Core().RESTClient().Post().
			Prefix("proxy").
			Resource("nodes").
			Name(fmt.Sprintf("%v:%v", nodeName, ports.KubeletPort)).
			Suffix("stats/container").
			SetHeader("Content-Type", "application/json").
			Body(reqBody).
			Do().Raw()
	}
	if err != nil {
		return nil, err
	}

	var containers map[string]cadvisorapi.ContainerInfo
	err = json.Unmarshal(data, &containers)
	if err != nil {
		return nil, err
	}
	return containers, nil
}