Golang Client.Get方法代码示例

func CheckCadvisorHealthOnAllNodes(c *client.Client, timeout time.Duration) {
	By("getting list of nodes")
	nodeList, err := c.Nodes().List(labels.Everything(), fields.Everything())
	expectNoError(err)
	var errors []error
	retries := maxRetries
	for {
		errors = []error{}
		for _, node := range nodeList.Items {
			// cadvisor is not accessible directly unless its port (4194 by default) is exposed.
			// Here, we access '/stats/' REST endpoint on the qinglet which polls cadvisor internally.
			statsResource := fmt.Sprintf("api/v1/proxy/nodes/%s/stats/", node.Name)
			By(fmt.Sprintf("Querying stats from node %s using url %s", node.Name, statsResource))
			_, err = c.Get().AbsPath(statsResource).Timeout(timeout).Do().Raw()
			if err != nil {
				errors = append(errors, err)
			}
		}
		if len(errors) == 0 {
			return
		}
		if retries--; retries <= 0 {
			break
		}
		Logf("failed to retrieve qinglet stats -\n %v", errors)
		time.Sleep(sleepDuration)
	}
	Failf("Failed after retrying %d times for cadvisor to be healthy on all nodes. Errors:\n%v", maxRetries, errors)
}

// Retrieve metrics from the qinglet server of the given node.
func getQingletMetrics(c *client.Client, node string) (string, error) {
	metric, err := c.Get().
		Prefix("proxy").
		Resource("nodes").
		Name(fmt.Sprintf("%v:%v", node, ports.QingletPort)).
		Suffix("metrics").
		Do().
		Raw()
	if err != nil {
		return "", err
	}
	return string(metric), nil
}

func makeRequestToGuestbook(c *client.Client, cmd, value string, ns string) (string, error) {
	result, err := c.Get().
		Prefix("proxy").
		Namespace(ns).
		Resource("services").
		Name("frontend").
		Suffix("/index.php").
		Param("cmd", cmd).
		Param("key", "messages").
		Param("value", value).
		Do().
		Raw()
	return string(result), err
}

func assertFilesExist(fileNames []string, fileDir string, pod *api.Pod, client *client.Client) {
	var failed []string

	expectNoError(wait.Poll(time.Second*2, time.Second*60, func() (bool, error) {
		failed = []string{}
		for _, fileName := range fileNames {
			if _, err := client.Get().
				Prefix("proxy").
				Resource("pods").
				Namespace(pod.Namespace).
				Name(pod.Name).
				Suffix(fileDir, fileName).
				Do().Raw(); err != nil {
				Logf("Unable to read %s from pod %s: %v", fileName, pod.Name, err)
				failed = append(failed, fileName)
			}
		}
		if len(failed) == 0 {
			return true, nil
		}
		Logf("Lookups using %s failed for: %v\n", pod.Name, failed)
		return false, nil
	}))
	Expect(len(failed)).To(Equal(0))
}

// NewListWatchFromClient creates a new ListWatch from the specified client, resource, namespace and field selector.
func NewListWatchFromClient(c *client.Client, resource string, namespace string, fieldSelector fields.Selector) *ListWatch {
	listFunc := func() (runtime.Object, error) {
		return c.Get().
			Namespace(namespace).
			Resource(resource).
			FieldsSelectorParam(fieldSelector).
			Do().
			Get()
	}
	watchFunc := func(resourceVersion string) (watch.Interface, error) {
		return c.Get().
			Prefix("watch").
			Namespace(namespace).
			Resource(resource).
			FieldsSelectorParam(fieldSelector).
			Param("resourceVersion", resourceVersion).Watch()
	}
	return &ListWatch{ListFunc: listFunc, WatchFunc: watchFunc}
}

// Start a client pod using given VolumeSource (exported by startVolumeServer())
// and check that the pod sees the data from the server pod.
func testVolumeClient(client *client.Client, config VolumeTestConfig, volume api.VolumeSource, expectedContent string) {
	By(fmt.Sprint("starting ", config.prefix, " client"))
	podClient := client.Pods(config.namespace)

	clientPod := &api.Pod{
		TypeMeta: api.TypeMeta{
			Kind:       "Pod",
			APIVersion: "v1",
		},
		ObjectMeta: api.ObjectMeta{
			Name: config.prefix + "-client",
			Labels: map[string]string{
				"role": config.prefix + "-client",
			},
		},
		Spec: api.PodSpec{
			Containers: []api.Container{
				{
					Name:  config.prefix + "-client",
					Image: "qingyuan/nginx:1.7.9",
					Ports: []api.ContainerPort{
						{
							Name:          "web",
							ContainerPort: 80,
							Protocol:      api.ProtocolTCP,
						},
					},
					VolumeMounts: []api.VolumeMount{
						{
							Name:      config.prefix + "-volume",
							MountPath: "/usr/share/nginx/html",
						},
					},
				},
			},
			Volumes: []api.Volume{
				{
					Name:         config.prefix + "-volume",
					VolumeSource: volume,
				},
			},
		},
	}
	if _, err := podClient.Create(clientPod); err != nil {
		Failf("Failed to create %s pod: %v", clientPod.Name, err)
	}
	expectNoError(waitForPodRunningInNamespace(client, clientPod.Name, config.namespace))

	By("reading a web page from the client")
	body, err := client.Get().
		Namespace(config.namespace).
		Prefix("proxy").
		Resource("pods").
		Name(clientPod.Name).
		DoRaw()
	expectNoError(err, "Cannot read web page: %v", err)
	Logf("body: %v", string(body))

	By("checking the page content")
	Expect(body).To(ContainSubstring(expectedContent))
}

func testPreStop(c *client.Client, 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: "qingyuan/nettest:1.3",
					Ports: []api.ContainerPort{{ContainerPort: 8080}},
				},
			},
		},
	}
	By(fmt.Sprintf("Creating server pod %s in namespace %s", podDescr.Name, ns))
	_, err := c.Pods(ns).Create(podDescr)
	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.Pods(ns).Delete(podDescr.Name, nil)
	}()

	By("Waiting for pods to come up.")
	err = waitForPodRunningInNamespace(c, podDescr.Name, ns)
	expectNoError(err, "waiting for server pod to start")

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

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

	preStopDescr := &api.Pod{
		ObjectMeta: api.ObjectMeta{
			Name: "tester",
		},
		Spec: api.PodSpec{
			Containers: []api.Container{
				{
					Name:    "tester",
					Image:   "qingyuan/busybox",
					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", podDescr.Name, ns))
	_, err = c.Pods(ns).Create(preStopDescr)
	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.Pods(ns).Delete(preStopDescr.Name, nil)
		}
	}()

	err = waitForPodRunningInNamespace(c, preStopDescr.Name, ns)
	expectNoError(err, "waiting for tester pod to start")

	// Delete the pod with the preStop handler.
	By("Deleting pre-stop pod")
	if err := c.Pods(ns).Delete(preStopDescr.Name, nil); err == nil {
		deletePreStop = false
	}
	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) {
		if body, err := c.Get().
			Namespace(ns).Prefix("proxy").
			Resource("pods").
			Name(podDescr.Name).
			Suffix("read").
			DoRaw(); err != nil {
			By(fmt.Sprintf("Error validating prestop: %v", err))
		} else {
			Logf("Saw: %s", string(body))
			state := State{}
			err := json.Unmarshal(body, &state)
			if err != nil {
				Logf("Error parsing: %v", err)
				return false, nil
			}
			if state.Received["prestop"] != 0 {
//.........这里部分代码省略.........

func runSelfLinkTestOnNamespace(c *client.Client, namespace string) {
	svcBody := api.Service{
		ObjectMeta: api.ObjectMeta{
			Name:      "selflinktest",
			Namespace: namespace,
			Labels: map[string]string{
				"name": "selflinktest",
			},
		},
		Spec: api.ServiceSpec{
			// This is here because validation requires it.
			Selector: map[string]string{
				"foo": "bar",
			},
			Ports: []api.ServicePort{{
				Port:     12345,
				Protocol: "TCP",
			}},
			SessionAffinity: "None",
		},
	}
	services := c.Services(namespace)
	svc, err := services.Create(&svcBody)
	if err != nil {
		glog.Fatalf("Failed creating selflinktest service: %v", err)
	}
	err = c.Get().RequestURI(svc.SelfLink).Do().Into(svc)
	if err != nil {
		glog.Fatalf("Failed listing service with supplied self link '%v': %v", svc.SelfLink, err)
	}

	svcList, err := services.List(labels.Everything())
	if err != nil {
		glog.Fatalf("Failed listing services: %v", err)
	}

	err = c.Get().RequestURI(svcList.SelfLink).Do().Into(svcList)
	if err != nil {
		glog.Fatalf("Failed listing services with supplied self link '%v': %v", svcList.SelfLink, err)
	}

	found := false
	for i := range svcList.Items {
		item := &svcList.Items[i]
		if item.Name != "selflinktest" {
			continue
		}
		found = true
		err = c.Get().RequestURI(item.SelfLink).Do().Into(svc)
		if err != nil {
			glog.Fatalf("Failed listing service with supplied self link '%v': %v", item.SelfLink, err)
		}
		break
	}
	if !found {
		glog.Fatalf("never found selflinktest service in namespace %s", namespace)
	}
	glog.Infof("Self link test passed in namespace %s", namespace)

	// TODO: Should test PUT at some point, too.
}