Golang Client.Get方法代碼示例

// Retrieves metrics information.
func getMetrics(c *client.Client) (string, error) {
	body, err := c.Get().AbsPath("/metrics").DoRaw()
	if err != nil {
		return "", err
	}
	return string(body), nil
}

// Query sends a command to the server and returns the Response
func Query(c *client.Client, query string) (*influxdb.Response, error) {
	result, err := c.Get().
		Prefix("proxy").
		Namespace("kube-system").
		Resource("services").
		Name(influxdbService+":api").
		Suffix("query").
		Param("q", query).
		Param("db", influxdbDatabaseName).
		Param("epoch", "s").
		Do().
		Raw()

	if err != nil {
		return nil, err
	}

	var response influxdb.Response
	dec := json.NewDecoder(bytes.NewReader(result))
	dec.UseNumber()
	err = dec.Decode(&response)

	if err != nil {
		return nil, err
	}
	return &response, nil
}

// Performs a get on a node proxy endpoint given the nodename and rest client.
func nodeProxyRequest(c *client.Client, node, endpoint string) (restclient.Result, error) {
	// proxy tends to hang in some cases when Node is not ready. Add an artificial timeout for this call.
	// This will leak a goroutine if proxy hangs. #22165
	subResourceProxyAvailable, err := serverVersionGTE(subResourceServiceAndNodeProxyVersion, c)
	if err != nil {
		return restclient.Result{}, err
	}
	var result restclient.Result
	finished := make(chan struct{})
	go func() {
		if subResourceProxyAvailable {
			result = c.Get().
				Resource("nodes").
				SubResource("proxy").
				Name(fmt.Sprintf("%v:%v", node, ports.KubeletPort)).
				Suffix(endpoint).
				Do()

		} else {
			result = c.Get().
				Prefix("proxy").
				Resource("nodes").
				Name(fmt.Sprintf("%v:%v", node, ports.KubeletPort)).
				Suffix(endpoint).
				Do()
		}
		finished <- struct{}{}
	}()
	select {
	case <-finished:
		return result, nil
	case <-time.After(proxyTimeout):
		return restclient.Result{}, nil
	}
}

// serverAPIVersions fetches the server versions available from the groupless API at the given prefix
func serverAPIVersions(c *kclient.Client, grouplessPrefix string) ([]unversioned.GroupVersion, error) {
	// Get versions doc
	body, err := c.Get().AbsPath(grouplessPrefix).Do().Raw()
	if err != nil {
		return []unversioned.GroupVersion{}, err
	}

	// Unmarshal
	var v unversioned.APIVersions
	err = json.Unmarshal(body, &v)
	if err != nil {
		return []unversioned.GroupVersion{}, fmt.Errorf("got '%s': %v", string(body), err)
	}

	// Convert to GroupVersion structs
	serverAPIVersions := []unversioned.GroupVersion{}
	for _, version := range v.Versions {
		gv, err := unversioned.ParseGroupVersion(version)
		if err != nil {
			return []unversioned.GroupVersion{}, err
		}
		serverAPIVersions = append(serverAPIVersions, gv)
	}
	return serverAPIVersions, nil
}

func CheckCadvisorHealthOnAllNodes(c *client.Client, timeout time.Duration) {
	// It should be OK to list unschedulable Nodes here.
	By("getting list of nodes")
	nodeList, err := c.Nodes().List(api.ListOptions{})
	framework.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 kubelet 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
		}
		framework.Logf("failed to retrieve kubelet stats -\n %v", errors)
		time.Sleep(sleepDuration)
	}
	framework.Failf("Failed after retrying %d times for cadvisor to be healthy on all nodes. Errors:\n%v", maxRetries, errors)
}

// Performs a get on a node proxy endpoint given the nodename and rest client.
func nodeProxyRequest(c *client.Client, node, endpoint string) client.Result {
	return c.Get().
		Prefix("proxy").
		Resource("nodes").
		Name(fmt.Sprintf("%v:%v", node, ports.KubeletPort)).
		Suffix(endpoint).
		Do()
}

// utility function for gomega Eventually
func getPodLogs(c *client.Client, namespace, podName, containerName string) (string, error) {
	logs, err := c.Get().Resource("pods").Namespace(namespace).Name(podName).SubResource("log").Param("container", containerName).Do().Raw()
	if err != nil {
		return "", err
	}
	if err == nil && strings.Contains(string(logs), "Internal Error") {
		return "", fmt.Errorf("Internal Error")
	}
	return string(logs), err
}

// Resets latency metrics in apiserver.
func resetMetrics(c *client.Client) error {
	Logf("Resetting latency metrics in apiserver...")
	body, err := c.Get().AbsPath("/resetMetrics").DoRaw()
	if err != nil {
		return err
	}
	if string(body) != "metrics reset\n" {
		return fmt.Errorf("Unexpected response: %q", string(body))
	}
	return 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("/guestbook.php").
		Param("cmd", cmd).
		Param("key", "messages").
		Param("value", value).
		Do().
		Raw()
	return string(result), err
}

// availSize returns the available disk space on a given node by querying node stats which
// is in turn obtained internally from cadvisor.
func availSize(c *client.Client, node *api.Node) (uint64, error) {
	statsResource := fmt.Sprintf("api/v1/proxy/nodes/%s/stats/", node.Name)
	Logf("Querying stats for node %s using url %s", node.Name, statsResource)
	res, err := c.Get().AbsPath(statsResource).Timeout(time.Minute).Do().Raw()
	if err != nil {
		return 0, fmt.Errorf("error querying cAdvisor API: %v", err)
	}
	ci := cadvisorapi.ContainerInfo{}
	err = json.Unmarshal(res, &ci)
	if err != nil {
		return 0, fmt.Errorf("couldn't unmarshal container info: %v", err)
	}
	return ci.Stats[len(ci.Stats)-1].Filesystem[0].Available, nil
}

func CheckCadvisorHealthOnAllNodes(c *client.Client, timeout time.Duration) {
	// It should be OK to list unschedulable Nodes here.
	By("getting list of nodes")
	nodeList, err := c.Nodes().List(api.ListOptions{})
	framework.ExpectNoError(err)
	var errors []error

	// returns maxRetries, sleepDuration
	readConfig := func() (int, time.Duration) {
		// Read in configuration settings, reasonable defaults.
		retry := framework.TestContext.Cadvisor.MaxRetries
		if framework.TestContext.Cadvisor.MaxRetries == 0 {
			retry = 6
			framework.Logf("Overriding default retry value of zero to %d", retry)
		}

		sleepDurationMS := framework.TestContext.Cadvisor.SleepDurationMS
		if sleepDurationMS == 0 {
			sleepDurationMS = 10000
			framework.Logf("Overriding default milliseconds value of zero to %d", sleepDurationMS)
		}

		return retry, time.Duration(sleepDurationMS) * time.Millisecond
	}

	maxRetries, sleepDuration := readConfig()
	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 kubelet 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 maxRetries--; maxRetries <= 0 {
			break
		}
		framework.Logf("failed to retrieve kubelet stats -\n %v", errors)
		time.Sleep(sleepDuration)
	}
	framework.Failf("Failed after retrying %d times for cadvisor to be healthy on all nodes. Errors:\n%v", maxRetries, errors)
}

// readTransactions reads # of transactions from the k8petstore web server endpoint.
// for more details see the source of the k8petstore web server.
func readTransactions(c *client.Client, ns string) (error, int) {
	body, err := c.Get().
		Namespace(ns).
		Prefix("proxy").
		Resource("services").
		Name("frontend").
		Suffix("llen").
		DoRaw()
	if err != nil {
		return err, -1
	} else {
		totalTrans, err := strconv.Atoi(string(body))
		return err, totalTrans
	}
}

func makeRequestToGuestbook(c *client.Client, cmd, value string, ns string) (string, error) {
	proxyRequest, errProxy := getServicesProxyRequest(c, c.Get())
	if errProxy != nil {
		return "", errProxy
	}
	result, err := proxyRequest.Namespace(ns).
		Name("frontend").
		Suffix("/guestbook.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().
				Namespace(pod.Namespace).
				Resource("pods").
				SubResource("proxy").
				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))
}

// readTransactions reads # of transactions from the k8petstore web server endpoint.
// for more details see the source of the k8petstore web server.
func readTransactions(c *client.Client, ns string) (error, int) {
	proxyRequest, errProxy := getServicesProxyRequest(c, c.Get())
	if errProxy != nil {
		return errProxy, -1
	}
	body, err := proxyRequest.Namespace(ns).
		Name("frontend").
		Suffix("llen").
		DoRaw()
	if err != nil {
		return err, -1
	} else {
		totalTrans, err := strconv.Atoi(string(body))
		return err, totalTrans
	}
}