Golang clientcmd.LoadFromFile函数代码示例

func getKubeClient() (string, *kclient.Client, error) {
	c, err := kclientcmd.LoadFromFile(*kubeConfig)
	if err != nil {
		return "", nil, fmt.Errorf("error loading kubeConfig: %v", err.Error())
	}
	if c.CurrentContext == "" || len(c.Clusters) == 0 {
		return "", nil, fmt.Errorf("invalid kubeConfig: %+v", *c)
	}
	config, err := kclientcmd.NewDefaultClientConfig(
		*c,
		&kclientcmd.ConfigOverrides{
			ClusterInfo: kclientcmdkapi.Cluster{
				APIVersion: "v1",
			},
		}).ClientConfig()
	if err != nil {
		return "", nil, fmt.Errorf("error parsing kubeConfig: %v", err.Error())
	}
	kubeClient, err := kclient.New(config)
	if err != nil {
		return "", nil, fmt.Errorf("error creating client - %q", err)
	}

	return c.Clusters[c.CurrentContext].Server, kubeClient, nil
}

func CreateClientFromFile(path string) (*clientset.Clientset, error) {
	adminKubeconfig, err := clientcmd.LoadFromFile(path)
	if err != nil {
		return nil, fmt.Errorf("failed to load admin kubeconfig [%v]", err)
	}
	return createAPIClient(adminKubeconfig)
}

// Login logs into the specified server using given credentials and CA file
func Login(username, password, server, configDir string, f *clientcmd.Factory, c *cobra.Command, out io.Writer) error {

	existingConfig, err := f.OpenShiftClientConfig.RawConfig()
	if err != nil {
		if !os.IsNotExist(err) {
			return err
		}
		existingConfig = *(kclientcmdapi.NewConfig())
	}
	adminConfig, err := kclientcmd.LoadFromFile(filepath.Join(configDir, "master", "admin.kubeconfig"))
	if err != nil {
		return err
	}
	for k := range adminConfig.AuthInfos {
		adminConfig.AuthInfos[k].LocationOfOrigin = ""
	}
	newConfig, err := config.MergeConfig(existingConfig, *adminConfig)
	if err != nil {
		return err
	}
	output := ioutil.Discard
	if glog.V(1) {
		output = out
	}
	opts := &cmd.LoginOptions{
		Server:             server,
		Username:           username,
		Password:           password,
		Out:                output,
		StartingKubeConfig: newConfig,
		PathOptions:        config.NewPathOptions(c),
	}
	return cmd.RunLogin(nil, opts)
}

func loggedInUserFactory() (*clientcmd.Factory, error) {
	cfg, err := kclientcmd.LoadFromFile(config.RecommendedHomeFile)
	if err != nil {
		return nil, err
	}
	defaultCfg := kclientcmd.NewDefaultClientConfig(*cfg, &kclientcmd.ConfigOverrides{})
	return clientcmd.NewFactory(defaultCfg), nil
}

// getStartingConfig returns the Config object built from the sources specified by the options, the filename read (only if it was a single file), and an error if something goes wrong
func (o *ViewOptions) getStartingConfig() (*clientcmdapi.Config, error) {
	switch {
	case !o.Merge.Value():
		return clientcmd.LoadFromFile(o.ConfigAccess.GetExplicitFile())

	default:
		return o.ConfigAccess.GetStartingConfig()
	}
}

func (c *HollowNodeConfig) createClientConfigFromFile() (*restclient.Config, error) {
	clientConfig, err := clientcmd.LoadFromFile(c.KubeconfigPath)
	if err != nil {
		return nil, fmt.Errorf("error while loading kubeconfig from file %v: %v", c.KubeconfigPath, err)
	}
	config, err := clientcmd.NewDefaultClientConfig(*clientConfig, &clientcmd.ConfigOverrides{}).ClientConfig()
	if err != nil {
		return nil, fmt.Errorf("error while creating kubeconfig: %v", err)
	}
	config.ContentType = c.ContentType
	return config, nil
}

// getConfigFromFileOrDie tries to read a kubeconfig file and if it can't, it calls exit.  One exception, missing files result in empty configs, not an exit
func getConfigFromFileOrDie(filename string) *clientcmdapi.Config {
	config, err := clientcmd.LoadFromFile(filename)
	if err != nil && !os.IsNotExist(err) {
		glog.FatalDepth(1, err)
	}

	if config == nil {
		return clientcmdapi.NewConfig()
	}

	return config
}

func testKubeconfigUpdate(t *testing.T, federationName, lbIP, kubeconfigGlobal, kubeconfigExplicit string) {
	filename := kubeconfigGlobal
	if kubeconfigExplicit != "" {
		filename = kubeconfigExplicit
	}
	config, err := clientcmd.LoadFromFile(filename)
	if err != nil {
		t.Errorf("Failed to open kubeconfig file: %v", err)
		return
	}

	cluster, ok := config.Clusters[federationName]
	if !ok {
		t.Errorf("No cluster info for %q", federationName)
		return
	}
	endpoint := lbIP
	if !strings.HasSuffix(lbIP, "https://") {
		endpoint = fmt.Sprintf("https://%s", lbIP)
	}
	if cluster.Server != endpoint {
		t.Errorf("Want federation API server endpoint %q, got %q", endpoint, cluster.Server)
	}

	authInfo, ok := config.AuthInfos[federationName]
	if !ok {
		t.Errorf("No credentials for %q", federationName)
		return
	}
	if len(authInfo.ClientCertificateData) == 0 {
		t.Errorf("Expected client certificate to be non-empty")
		return
	}
	if len(authInfo.ClientKeyData) == 0 {
		t.Errorf("Expected client key to be non-empty")
		return
	}
	if authInfo.Username != AdminCN {
		t.Errorf("Want username: %q, got: %q", AdminCN, authInfo.Username)
	}

	context, ok := config.Contexts[federationName]
	if !ok {
		t.Errorf("No context for %q", federationName)
		return
	}
	if context.Cluster != federationName {
		t.Errorf("Want context cluster name: %q, got: %q", federationName, context.Cluster)
	}
	if context.AuthInfo != federationName {
		t.Errorf("Want context auth info: %q, got: %q", federationName, context.AuthInfo)
	}
}

func createClientFromFile(path string) (*client.Client, error) {
	c, err := clientcmd.LoadFromFile(path)
	if err != nil {
		return nil, fmt.Errorf("error while loading kubeconfig from file %v: %v", path, err)
	}
	config, err := clientcmd.NewDefaultClientConfig(*c, &clientcmd.ConfigOverrides{}).ClientConfig()
	if err != nil {
		return nil, fmt.Errorf("error while creating kubeconfig: %v", err)
	}
	client, err := client.New(config)
	if err != nil {
		return nil, fmt.Errorf("error while creating client: %v", err)
	}
	return client, nil
}

// Factory returns a command factory that works with OpenShift server's admin credentials
func (c *ClientStartConfig) Factory() (*clientcmd.Factory, error) {
	if c.factory == nil {
		cfg, err := kclientcmd.LoadFromFile(filepath.Join(c.LocalConfigDir, "master", "admin.kubeconfig"))
		if err != nil {
			return nil, err
		}
		overrides := &kclientcmd.ConfigOverrides{}
		if c.PortForwarding {
			overrides.ClusterInfo.Server = fmt.Sprintf("https://%s:8443", c.ServerIP)
		}
		defaultCfg := kclientcmd.NewDefaultClientConfig(*cfg, overrides)
		c.factory = clientcmd.NewFactory(defaultCfg)
	}
	return c.factory, nil
}

func createClientsetForCluster(c federationapi.Cluster, i int, userAgentName string) *kubeclientset.Clientset {
	kubecfg, err := clientcmd.LoadFromFile(framework.TestContext.KubeConfig)
	framework.ExpectNoError(err, "error loading KubeConfig: %v", err)

	cfgOverride := &clientcmd.ConfigOverrides{
		ClusterInfo: clientcmdapi.Cluster{
			Server: c.Spec.ServerAddressByClientCIDRs[0].ServerAddress,
		},
	}
	ccfg := clientcmd.NewNonInteractiveClientConfig(*kubecfg, c.Name, cfgOverride, clientcmd.NewDefaultClientConfigLoadingRules())
	cfg, err := ccfg.ClientConfig()
	framework.ExpectNoError(err, "Error creating client config in cluster #%d (%q)", i, c.Name)

	cfg.QPS = KubeAPIQPS
	cfg.Burst = KubeAPIBurst
	return kubeclientset.NewForConfigOrDie(restclient.AddUserAgent(cfg, userAgentName))
}

// k8s.io/kubernetes/pkg/client/unversioned/clientcmd/loader.go
func directKClientConfig(kubeconfigPath string, context, server string) clientcmd.ClientConfig {
	conf, err := clientcmd.LoadFromFile(kubeconfigPath)
	//conf, err := clientcmd.NewDefaultPathOptions().GetStartingConfig()
	if err != nil {
		glog.Errorf("client not configured: %v\n", err)
		return nil
	}
	glog.Infof("kube client configured: %+v\n", conf)

	var clientConfig clientcmd.ClientConfig
	overrides := &clientcmd.ConfigOverrides{}
	if server != "" {
		overrides.ClusterInfo = kclientcmdapi.Cluster{Server: server}
	}
	if context != "" {
		overrides.CurrentContext = context
	}
	clientConfig = clientcmd.NewNonInteractiveClientConfig(*conf,
		context, overrides)
	return clientConfig
}

func (test deleteContextTest) run(t *testing.T) {
	fakeKubeFile, _ := ioutil.TempFile("", "")
	defer os.Remove(fakeKubeFile.Name())
	err := clientcmd.WriteToFile(test.config, fakeKubeFile.Name())
	if err != nil {
		t.Fatalf("unexpected error: %v", err)
	}

	pathOptions := clientcmd.NewDefaultPathOptions()
	pathOptions.GlobalFile = fakeKubeFile.Name()
	pathOptions.EnvVar = ""

	buf := bytes.NewBuffer([]byte{})
	cmd := NewCmdConfigDeleteContext(buf, pathOptions)
	cmd.SetArgs([]string{test.contextToDelete})
	if err := cmd.Execute(); err != nil {
		t.Fatalf("unexpected error executing command: %v", err)
	}

	expectedOutWithFile := fmt.Sprintf(test.expectedOut, fakeKubeFile.Name())
	if expectedOutWithFile != buf.String() {
		t.Errorf("expected output %s, but got %s", expectedOutWithFile, buf.String())
		return
	}

	// Verify context was removed from kubeconfig file
	config, err := clientcmd.LoadFromFile(fakeKubeFile.Name())
	if err != nil {
		t.Fatalf("unexpected error loading kubeconfig file: %v", err)
	}

	contexts := make([]string, 0, len(config.Contexts))
	for k := range config.Contexts {
		contexts = append(contexts, k)
	}

	if !reflect.DeepEqual(test.expectedContexts, contexts) {
		t.Errorf("expected contexts %v, but found %v in kubeconfig", test.expectedContexts, contexts)
	}
}

func main() {
	//kubeconfig = "/home/ubuntu/.kube/config"

	// k8s.io/kubernetes/pkg/client/unversioned/clientcmd/loader.go
	config, err := clientcmd.LoadFromFile(kubeconfig)
	if err != nil {
		log.Fatal(err)
	}

	// k8s.io/kubernetes/pkg/client/unversioned/clientcmd/client_config.go
	clientConfig := clientcmd.NewDefaultClientConfig(*config, &clientcmd.ConfigOverrides{})

	restConfig, err := clientConfig.ClientConfig()
	if err != nil {
		log.Fatal(err)
	}

	// k8s.io/kubernetes/pkg/client/unversioned/helper.go
	kclient, err := unversioned.New(restConfig)
	if err != nil {
		log.Fatal(err)
	}

	// k8s.io/kubernetes/pkg/client/unversioned/client.go
	// k8s.io/kubernetes/pkg/client/unversioned/pods.go
	result, err := kclient.Pods("default").List(kapi.ListOptions{})
	if err != nil {
		log.Fatal(err)
	}

	// k8s.io/kubernetes/pkg/runtime/codec.go
	// k8s.io/kubernetes/pkg/api/register.go
	// k8s.io/kubernetes/pkg/runtime/serializer/codec_factory.go
	b, err := runtime.Encode(kapi.Codecs.LegacyCodec(kapi.SchemeGroupVersion), result, kapi.SchemeGroupVersion)
	if err != nil {
		log.Fatal(err)
	}
	fmt.Printf("Output list:\n%s\n", b)
}

func main() {
	flag.Parse()

	glog.Infof("Starting serve_hostnames soak test with queries=%d and podsPerNode=%d upTo=%d",
		*queriesAverage, *podsPerNode, *upTo)

	var spec string
	if *gke != "" {
		spec = filepath.Join(os.Getenv("HOME"), ".config", "gcloud", "kubernetes", "kubeconfig")
	} else {
		spec = filepath.Join(os.Getenv("HOME"), ".kube", "config")
	}
	settings, err := clientcmd.LoadFromFile(spec)
	if err != nil {
		glog.Fatalf("Error loading configuration: %v", err.Error())
	}
	if *gke != "" {
		settings.CurrentContext = *gke
	}
	config, err := clientcmd.NewDefaultClientConfig(*settings, &clientcmd.ConfigOverrides{}).ClientConfig()
	if err != nil {
		glog.Fatalf("Failed to construct config: %v", err)
	}

	c, err := client.New(config)
	if err != nil {
		glog.Fatalf("Failed to make client: %v", err)
	}

	var nodes *api.NodeList
	for start := time.Now(); time.Since(start) < nodeListTimeout; time.Sleep(2 * time.Second) {
		nodes, err = c.Nodes().List(api.ListOptions{})
		if err == nil {
			break
		}
		glog.Warningf("Failed to list nodes: %v", err)
	}
	if err != nil {
		glog.Fatalf("Giving up trying to list nodes: %v", err)
	}

	if len(nodes.Items) == 0 {
		glog.Fatalf("Failed to find any nodes.")
	}

	glog.Infof("Found %d nodes on this cluster:", len(nodes.Items))
	for i, node := range nodes.Items {
		glog.Infof("%d: %s", i, node.Name)
	}

	queries := *queriesAverage * len(nodes.Items) * *podsPerNode

	// Create the namespace
	got, err := c.Namespaces().Create(&api.Namespace{ObjectMeta: api.ObjectMeta{GenerateName: "serve-hostnames-"}})
	if err != nil {
		glog.Fatalf("Failed to create namespace: %v", err)
	}
	ns := got.Name
	defer func(ns string) {
		if err := c.Namespaces().Delete(ns); err != nil {
			glog.Warningf("Failed to delete namespace ns: %e", ns, err)
		} else {
			// wait until the namespace disappears
			for i := 0; i < int(namespaceDeleteTimeout/time.Second); i++ {
				if _, err := c.Namespaces().Get(ns); err != nil {
					if errors.IsNotFound(err) {
						return
					}
				}
				time.Sleep(time.Second)
			}
		}
	}(ns)
	glog.Infof("Created namespace %s", ns)

	// Create a service for these pods.
	glog.Infof("Creating service %s/serve-hostnames", ns)
	// Make several attempts to create a service.
	var svc *api.Service
	for start := time.Now(); time.Since(start) < serviceCreateTimeout; time.Sleep(2 * time.Second) {
		t := time.Now()
		svc, err = c.Services(ns).Create(&api.Service{
			ObjectMeta: api.ObjectMeta{
				Name: "serve-hostnames",
				Labels: map[string]string{
					"name": "serve-hostname",
				},
			},
			Spec: api.ServiceSpec{
				Ports: []api.ServicePort{{
					Protocol:   "TCP",
					Port:       9376,
					TargetPort: intstr.FromInt(9376),
				}},
				Selector: map[string]string{
					"name": "serve-hostname",
				},
			},
		})
		glog.V(4).Infof("Service create %s/server-hostnames took %v", ns, time.Since(t))
//.........这里部分代码省略.........