Replace godep with dep

vendor/k8s.io/kubernetes/federation/pkg/federation-controller/cluster/BUILD

@@ -0,0 +1,65 @@
+package(default_visibility = ["//visibility:public"])
+
+load(
+    "@io_bazel_rules_go//go:def.bzl",
+    "go_library",
+    "go_test",
+)
+
+go_test(
+    name = "go_default_test",
+    srcs = ["clustercontroller_test.go"],
+    library = ":go_default_library",
+    deps = [
+        "//federation/apis/federation/v1beta1:go_default_library",
+        "//federation/client/clientset_generated/federation_clientset:go_default_library",
+        "//pkg/api/testapi:go_default_library",
+        "//vendor/k8s.io/api/core/v1:go_default_library",
+        "//vendor/k8s.io/apimachinery/pkg/apis/meta/v1:go_default_library",
+        "//vendor/k8s.io/apimachinery/pkg/util/uuid:go_default_library",
+        "//vendor/k8s.io/client-go/rest:go_default_library",
+        "//vendor/k8s.io/client-go/tools/clientcmd:go_default_library",
+    ],
+)
+
+go_library(
+    name = "go_default_library",
+    srcs = [
+        "cluster_client.go",
+        "clustercontroller.go",
+        "doc.go",
+    ],
+    deps = [
+        "//federation/apis/federation/v1beta1:go_default_library",
+        "//federation/client/cache:go_default_library",
+        "//federation/client/clientset_generated/federation_clientset:go_default_library",
+        "//federation/pkg/federation-controller/util:go_default_library",
+        "//pkg/api:go_default_library",
+        "//pkg/client/clientset_generated/internalclientset:go_default_library",
+        "//pkg/controller:go_default_library",
+        "//pkg/kubelet/apis:go_default_library",
+        "//vendor/github.com/golang/glog:go_default_library",
+        "//vendor/k8s.io/api/core/v1:go_default_library",
+        "//vendor/k8s.io/apimachinery/pkg/apis/meta/v1:go_default_library",
+        "//vendor/k8s.io/apimachinery/pkg/runtime:go_default_library",
+        "//vendor/k8s.io/apimachinery/pkg/util/runtime:go_default_library",
+        "//vendor/k8s.io/apimachinery/pkg/util/sets:go_default_library",
+        "//vendor/k8s.io/apimachinery/pkg/util/wait:go_default_library",
+        "//vendor/k8s.io/apimachinery/pkg/watch:go_default_library",
+        "//vendor/k8s.io/client-go/rest:go_default_library",
+        "//vendor/k8s.io/client-go/tools/cache:go_default_library",
+    ],
+)
+
+filegroup(
+    name = "package-srcs",
+    srcs = glob(["**"]),
+    tags = ["automanaged"],
+    visibility = ["//visibility:private"],
+)
+
+filegroup(
+    name = "all-srcs",
+    srcs = [":package-srcs"],
+    tags = ["automanaged"],
+)

vendor/k8s.io/kubernetes/federation/pkg/federation-controller/cluster/cluster_client.go

@@ -0,0 +1,170 @@
+/*
+Copyright 2016 The Kubernetes Authors.
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+package cluster
+
+import (
+	"fmt"
+	"strings"
+
+	"github.com/golang/glog"
+	"k8s.io/api/core/v1"
+	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
+	"k8s.io/apimachinery/pkg/util/sets"
+	restclient "k8s.io/client-go/rest"
+	federation_v1beta1 "k8s.io/kubernetes/federation/apis/federation/v1beta1"
+	"k8s.io/kubernetes/federation/pkg/federation-controller/util"
+	"k8s.io/kubernetes/pkg/api"
+	clientset "k8s.io/kubernetes/pkg/client/clientset_generated/internalclientset"
+	kubeletapis "k8s.io/kubernetes/pkg/kubelet/apis"
+)
+
+const (
+	UserAgentName = "Cluster-Controller"
+)
+
+type ClusterClient struct {
+	kubeClient *clientset.Clientset
+}
+
+func NewClusterClientSet(c *federation_v1beta1.Cluster) (*ClusterClient, error) {
+	clusterConfig, err := util.BuildClusterConfig(c)
+	if err != nil {
+		return nil, err
+	}
+	var clusterClientSet = ClusterClient{}
+	if clusterConfig != nil {
+		clusterClientSet.kubeClient = clientset.NewForConfigOrDie((restclient.AddUserAgent(clusterConfig, UserAgentName)))
+		if clusterClientSet.kubeClient == nil {
+			return nil, nil
+		}
+	}
+	return &clusterClientSet, nil
+}
+
+// GetClusterHealthStatus gets the kubernetes cluster health status by requesting "/healthz"
+func (self *ClusterClient) GetClusterHealthStatus() *federation_v1beta1.ClusterStatus {
+	clusterStatus := federation_v1beta1.ClusterStatus{}
+	currentTime := metav1.Now()
+	newClusterReadyCondition := federation_v1beta1.ClusterCondition{
+		Type:               federation_v1beta1.ClusterReady,
+		Status:             v1.ConditionTrue,
+		Reason:             "ClusterReady",
+		Message:            "/healthz responded with ok",
+		LastProbeTime:      currentTime,
+		LastTransitionTime: currentTime,
+	}
+	newClusterNotReadyCondition := federation_v1beta1.ClusterCondition{
+		Type:               federation_v1beta1.ClusterReady,
+		Status:             v1.ConditionFalse,
+		Reason:             "ClusterNotReady",
+		Message:            "/healthz responded without ok",
+		LastProbeTime:      currentTime,
+		LastTransitionTime: currentTime,
+	}
+	newNodeOfflineCondition := federation_v1beta1.ClusterCondition{
+		Type:               federation_v1beta1.ClusterOffline,
+		Status:             v1.ConditionTrue,
+		Reason:             "ClusterNotReachable",
+		Message:            "cluster is not reachable",
+		LastProbeTime:      currentTime,
+		LastTransitionTime: currentTime,
+	}
+	newNodeNotOfflineCondition := federation_v1beta1.ClusterCondition{
+		Type:               federation_v1beta1.ClusterOffline,
+		Status:             v1.ConditionFalse,
+		Reason:             "ClusterReachable",
+		Message:            "cluster is reachable",
+		LastProbeTime:      currentTime,
+		LastTransitionTime: currentTime,
+	}
+	body, err := self.kubeClient.DiscoveryClient.RESTClient().Get().AbsPath("/healthz").Do().Raw()
+	if err != nil {
+		clusterStatus.Conditions = append(clusterStatus.Conditions, newNodeOfflineCondition)
+	} else {
+		if !strings.EqualFold(string(body), "ok") {
+			clusterStatus.Conditions = append(clusterStatus.Conditions, newClusterNotReadyCondition, newNodeNotOfflineCondition)
+		} else {
+			clusterStatus.Conditions = append(clusterStatus.Conditions, newClusterReadyCondition)
+		}
+	}
+
+	zones, region, err := self.GetClusterZones()
+	if err != nil {
+		glog.Warningf("Failed to get zones and region for cluster with client %v: %v", self, err)
+	} else {
+		clusterStatus.Zones = zones
+		clusterStatus.Region = region
+	}
+
+	return &clusterStatus
+}
+
+// GetClusterZones gets the kubernetes cluster zones and region by inspecting labels on nodes in the cluster.
+func (self *ClusterClient) GetClusterZones() (zones []string, region string, err error) {
+	return getZoneNames(self.kubeClient)
+}
+
+// Find the name of the zone in which a Node is running
+func getZoneNameForNode(node api.Node) (string, error) {
+	for key, value := range node.Labels {
+		if key == kubeletapis.LabelZoneFailureDomain {
+			return value, nil
+		}
+	}
+	return "", fmt.Errorf("Zone name for node %s not found. No label with key %s",
+		node.Name, kubeletapis.LabelZoneFailureDomain)
+}
+
+// Find the name of the region in which a Node is running
+func getRegionNameForNode(node api.Node) (string, error) {
+	for key, value := range node.Labels {
+		if key == kubeletapis.LabelZoneRegion {
+			return value, nil
+		}
+	}
+	return "", fmt.Errorf("Region name for node %s not found. No label with key %s",
+		node.Name, kubeletapis.LabelZoneRegion)
+}
+
+// Find the names of all zones and the region in which we have nodes in this cluster.
+func getZoneNames(client *clientset.Clientset) (zones []string, region string, err error) {
+	zoneNames := sets.NewString()
+	nodes, err := client.Core().Nodes().List(metav1.ListOptions{})
+	if err != nil {
+		glog.Errorf("Failed to list nodes while getting zone names: %v", err)
+		return nil, "", err
+	}
+	for i, node := range nodes.Items {
+		// TODO: quinton-hoole make this more efficient.
+		//       For non-multi-zone clusters the zone will
+		//       be identical for all nodes, so we only need to look at one node
+		//       For multi-zone clusters we know at build time
+		//       which zones are included.  Rather get this info from there, because it's cheaper.
+		zoneName, err := getZoneNameForNode(node)
+		if err != nil {
+			return nil, "", err
+		}
+		zoneNames.Insert(zoneName)
+		if i == 0 {
+			region, err = getRegionNameForNode(node)
+			if err != nil {
+				return nil, "", err
+			}
+		}
+	}
+	return zoneNames.List(), region, nil
+}

vendor/k8s.io/kubernetes/federation/pkg/federation-controller/cluster/clustercontroller.go

@@ -0,0 +1,209 @@
+/*
+Copyright 2016 The Kubernetes Authors.
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+package cluster
+
+import (
+	"strings"
+	"sync"
+	"time"
+
+	"github.com/golang/glog"
+	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
+	"k8s.io/apimachinery/pkg/runtime"
+	utilruntime "k8s.io/apimachinery/pkg/util/runtime"
+	"k8s.io/apimachinery/pkg/util/sets"
+	"k8s.io/apimachinery/pkg/util/wait"
+	"k8s.io/apimachinery/pkg/watch"
+	restclient "k8s.io/client-go/rest"
+	"k8s.io/client-go/tools/cache"
+	federationv1beta1 "k8s.io/kubernetes/federation/apis/federation/v1beta1"
+	clustercache "k8s.io/kubernetes/federation/client/cache"
+	federationclientset "k8s.io/kubernetes/federation/client/clientset_generated/federation_clientset"
+	"k8s.io/kubernetes/pkg/controller"
+)
+
+type ClusterController struct {
+	// federationClient used to operate cluster
+	federationClient federationclientset.Interface
+
+	// clusterMonitorPeriod is the period for updating status of cluster
+	clusterMonitorPeriod time.Duration
+
+	mu              sync.RWMutex
+	knownClusterSet sets.String
+	// clusterClusterStatusMap is a mapping of clusterName and cluster status of last sampling
+	clusterClusterStatusMap map[string]federationv1beta1.ClusterStatus
+	// clusterKubeClientMap is a mapping of clusterName and restclient
+	clusterKubeClientMap map[string]ClusterClient
+
+	// cluster framework and store
+	clusterController cache.Controller
+	clusterStore      clustercache.StoreToClusterLister
+}
+
+// StartClusterController starts a new cluster controller
+func StartClusterController(config *restclient.Config, stopChan <-chan struct{}, clusterMonitorPeriod time.Duration) {
+	restclient.AddUserAgent(config, "cluster-controller")
+	client := federationclientset.NewForConfigOrDie(config)
+	controller := newClusterController(client, clusterMonitorPeriod)
+	glog.Infof("Starting cluster controller")
+	controller.Run(stopChan)
+}
+
+// newClusterController returns a new cluster controller
+func newClusterController(federationClient federationclientset.Interface, clusterMonitorPeriod time.Duration) *ClusterController {
+	cc := &ClusterController{
+		knownClusterSet:         make(sets.String),
+		federationClient:        federationClient,
+		clusterMonitorPeriod:    clusterMonitorPeriod,
+		clusterClusterStatusMap: make(map[string]federationv1beta1.ClusterStatus),
+		clusterKubeClientMap:    make(map[string]ClusterClient),
+	}
+	cc.clusterStore.Store, cc.clusterController = cache.NewInformer(
+		&cache.ListWatch{
+			ListFunc: func(options metav1.ListOptions) (runtime.Object, error) {
+				return cc.federationClient.Federation().Clusters().List(options)
+			},
+			WatchFunc: func(options metav1.ListOptions) (watch.Interface, error) {
+				return cc.federationClient.Federation().Clusters().Watch(options)
+			},
+		},
+		&federationv1beta1.Cluster{},
+		controller.NoResyncPeriodFunc(),
+		cache.ResourceEventHandlerFuncs{
+			DeleteFunc: cc.delFromClusterSet,
+			AddFunc:    cc.addToClusterSet,
+		},
+	)
+	return cc
+}
+
+// delFromClusterSet delete a cluster from clusterSet and
+// delete the corresponding restclient from the map clusterKubeClientMap
+func (cc *ClusterController) delFromClusterSet(obj interface{}) {
+	cc.mu.Lock()
+	defer cc.mu.Unlock()
+	cluster := obj.(*federationv1beta1.Cluster)
+	cc.delFromClusterSetByName(cluster.Name)
+}
+
+// delFromClusterSetByName delete a cluster from clusterSet by name and
+// delete the corresponding restclient from the map clusterKubeClientMap.
+// Caller must make sure that they hold the mutex
+func (cc *ClusterController) delFromClusterSetByName(clusterName string) {
+	glog.V(1).Infof("ClusterController observed a cluster deletion: %v", clusterName)
+	cc.knownClusterSet.Delete(clusterName)
+	delete(cc.clusterKubeClientMap, clusterName)
+	delete(cc.clusterClusterStatusMap, clusterName)
+}
+
+func (cc *ClusterController) addToClusterSet(obj interface{}) {
+	cc.mu.Lock()
+	defer cc.mu.Unlock()
+	cluster := obj.(*federationv1beta1.Cluster)
+	cc.addToClusterSetWithoutLock(cluster)
+}
+
+// addToClusterSetWithoutLock inserts the new cluster to clusterSet and create
+// a corresponding restclient to map clusterKubeClientMap if the cluster is not
+// known. Caller must make sure that they hold the mutex.
+func (cc *ClusterController) addToClusterSetWithoutLock(cluster *federationv1beta1.Cluster) {
+	if cc.knownClusterSet.Has(cluster.Name) {
+		return
+	}
+	glog.V(1).Infof("ClusterController observed a new cluster: %v", cluster.Name)
+	cc.knownClusterSet.Insert(cluster.Name)
+	// create the restclient of cluster
+	restClient, err := NewClusterClientSet(cluster)
+	if err != nil || restClient == nil {
+		glog.Errorf("Failed to create corresponding restclient of kubernetes cluster: %v", err)
+		return
+	}
+	cc.clusterKubeClientMap[cluster.Name] = *restClient
+}
+
+// Run begins watching and syncing.
+func (cc *ClusterController) Run(stopChan <-chan struct{}) {
+	defer utilruntime.HandleCrash()
+	go cc.clusterController.Run(stopChan)
+	// monitor cluster status periodically, in phase 1 we just get the health state from "/healthz"
+	go wait.Until(func() {
+		if err := cc.updateClusterStatus(); err != nil {
+			glog.Errorf("Error monitoring cluster status: %v", err)
+		}
+	}, cc.clusterMonitorPeriod, stopChan)
+}
+
+// updateClusterStatus checks cluster status and get the metrics from cluster's restapi
+func (cc *ClusterController) updateClusterStatus() error {
+	clusters, err := cc.federationClient.Federation().Clusters().List(metav1.ListOptions{})
+	if err != nil {
+		return err
+	}
+
+	for _, cluster := range clusters.Items {
+		cc.mu.RLock()
+		// skip updating status of the cluster which is not yet added to knownClusterSet.
+		if !cc.knownClusterSet.Has(cluster.Name) {
+			cc.mu.RUnlock()
+			continue
+		}
+		clusterClient, clientFound := cc.clusterKubeClientMap[cluster.Name]
+		clusterStatusOld, statusFound := cc.clusterClusterStatusMap[cluster.Name]
+		cc.mu.RUnlock()
+
+		if !clientFound {
+			glog.Warningf("Failed to get client for cluster %s", cluster.Name)
+			continue
+		}
+		clusterStatusNew := clusterClient.GetClusterHealthStatus()
+		if !statusFound {
+			glog.Infof("There is no status stored for cluster: %v before", cluster.Name)
+		} else {
+			hasTransition := false
+			if len(clusterStatusNew.Conditions) != len(clusterStatusOld.Conditions) {
+				hasTransition = true
+			} else {
+				for i := 0; i < len(clusterStatusNew.Conditions); i++ {
+					if !(strings.EqualFold(string(clusterStatusNew.Conditions[i].Type), string(clusterStatusOld.Conditions[i].Type)) &&
+						strings.EqualFold(string(clusterStatusNew.Conditions[i].Status), string(clusterStatusOld.Conditions[i].Status))) {
+						hasTransition = true
+						break
+					}
+				}
+			}
+
+			if !hasTransition {
+				for j := 0; j < len(clusterStatusNew.Conditions); j++ {
+					clusterStatusNew.Conditions[j].LastTransitionTime = clusterStatusOld.Conditions[j].LastTransitionTime
+				}
+			}
+		}
+
+		cc.mu.Lock()
+		cc.clusterClusterStatusMap[cluster.Name] = *clusterStatusNew
+		cc.mu.Unlock()
+		cluster.Status = *clusterStatusNew
+		cluster, err := cc.federationClient.Federation().Clusters().UpdateStatus(&cluster)
+		if err != nil {
+			glog.Warningf("Failed to update the status of cluster: %v ,error is : %v", cluster.Name, err)
+			// Don't return err here, as we want to continue processing remaining clusters.
+			continue
+		}
+	}
+	return nil
+}

vendor/k8s.io/kubernetes/federation/pkg/federation-controller/cluster/clustercontroller_test.go

@@ -0,0 +1,173 @@
+/*
+Copyright 2016 The Kubernetes Authors.
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+package cluster
+
+import (
+	"encoding/json"
+	"fmt"
+	"net/http"
+	"net/http/httptest"
+	"testing"
+	"time"
+
+	"k8s.io/api/core/v1"
+	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
+	"k8s.io/apimachinery/pkg/util/uuid"
+	restclient "k8s.io/client-go/rest"
+	"k8s.io/client-go/tools/clientcmd"
+	federationv1beta1 "k8s.io/kubernetes/federation/apis/federation/v1beta1"
+	federationclientset "k8s.io/kubernetes/federation/client/clientset_generated/federation_clientset"
+	"k8s.io/kubernetes/pkg/api/testapi"
+)
+
+func newCluster(clusterName string, serverUrl string) *federationv1beta1.Cluster {
+	cluster := federationv1beta1.Cluster{
+		TypeMeta: metav1.TypeMeta{APIVersion: testapi.Federation.GroupVersion().String()},
+		ObjectMeta: metav1.ObjectMeta{
+			UID:  uuid.NewUUID(),
+			Name: clusterName,
+		},
+		Spec: federationv1beta1.ClusterSpec{
+			ServerAddressByClientCIDRs: []federationv1beta1.ServerAddressByClientCIDR{
+				{
+					ClientCIDR:    "0.0.0.0/0",
+					ServerAddress: serverUrl,
+				},
+			},
+		},
+	}
+	return &cluster
+}
+
+func newClusterList(cluster *federationv1beta1.Cluster) *federationv1beta1.ClusterList {
+	clusterList := federationv1beta1.ClusterList{
+		TypeMeta: metav1.TypeMeta{APIVersion: testapi.Federation.GroupVersion().String()},
+		ListMeta: metav1.ListMeta{
+			SelfLink: "foobar",
+		},
+		Items: []federationv1beta1.Cluster{},
+	}
+	clusterList.Items = append(clusterList.Items, *cluster)
+	return &clusterList
+}
+
+// init a fake http handler, simulate a federation apiserver, response the "DELETE" "PUT" "GET" "UPDATE"
+// when "canBeGotten" is false, means that user can not get the cluster cluster from apiserver
+func createHttptestFakeHandlerForFederation(clusterList *federationv1beta1.ClusterList, canBeGotten bool) *http.HandlerFunc {
+	fakeHandler := http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+		clusterListString, _ := json.Marshal(*clusterList)
+		w.Header().Set("Content-Type", "application/json")
+		switch r.Method {
+		case "PUT":
+			fmt.Fprintln(w, string(clusterListString))
+		case "GET":
+			if canBeGotten {
+				fmt.Fprintln(w, string(clusterListString))
+			} else {
+				fmt.Fprintln(w, "")
+			}
+		default:
+			fmt.Fprintln(w, "")
+		}
+	})
+	return &fakeHandler
+}
+
+// init a fake http handler, simulate a cluster apiserver, response the "/healthz"
+// when "canBeGotten" is false, means that user can not get response from apiserver
+func createHttptestFakeHandlerForCluster(canBeGotten bool) *http.HandlerFunc {
+	fakeHandler := http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+		w.Header().Set("Content-Type", "application/json")
+		switch r.Method {
+		case "GET":
+			if canBeGotten {
+				fmt.Fprintln(w, "ok")
+			} else {
+				w.WriteHeader(http.StatusNotFound)
+			}
+		default:
+			fmt.Fprintln(w, "")
+		}
+	})
+	return &fakeHandler
+}
+
+func TestUpdateClusterStatusOK(t *testing.T) {
+	clusterName := "foobarCluster"
+	// create dummy httpserver
+	testClusterServer := httptest.NewServer(createHttptestFakeHandlerForCluster(true))
+	defer testClusterServer.Close()
+	federationCluster := newCluster(clusterName, testClusterServer.URL)
+	federationClusterList := newClusterList(federationCluster)
+
+	testFederationServer := httptest.NewServer(createHttptestFakeHandlerForFederation(federationClusterList, true))
+	defer testFederationServer.Close()
+
+	restClientCfg, err := clientcmd.BuildConfigFromFlags(testFederationServer.URL, "")
+	if err != nil {
+		t.Errorf("Failed to build client config")
+	}
+	federationClientSet := federationclientset.NewForConfigOrDie(restclient.AddUserAgent(restClientCfg, "cluster-controller"))
+
+	manager := newClusterController(federationClientSet, 5)
+	manager.addToClusterSet(federationCluster)
+	err = manager.updateClusterStatus()
+	if err != nil {
+		t.Errorf("Failed to Update Cluster Status: %v", err)
+	}
+	clusterStatus, found := manager.clusterClusterStatusMap[clusterName]
+	if !found {
+		t.Errorf("Failed to Update Cluster Status")
+	} else {
+		if (clusterStatus.Conditions[1].Status != v1.ConditionFalse) || (clusterStatus.Conditions[1].Type != federationv1beta1.ClusterOffline) {
+			t.Errorf("Failed to Update Cluster Status")
+		}
+	}
+}
+
+// Test races between informer's updates and routine updates of cluster status
+// Issue https://github.com/kubernetes/kubernetes/issues/49958
+func TestUpdateClusterRace(t *testing.T) {
+	clusterName := "foobarCluster"
+	// create dummy httpserver
+	testClusterServer := httptest.NewServer(createHttptestFakeHandlerForCluster(true))
+	defer testClusterServer.Close()
+	federationCluster := newCluster(clusterName, testClusterServer.URL)
+	federationClusterList := newClusterList(federationCluster)
+
+	testFederationServer := httptest.NewServer(createHttptestFakeHandlerForFederation(federationClusterList, true))
+	defer testFederationServer.Close()
+
+	restClientCfg, err := clientcmd.BuildConfigFromFlags(testFederationServer.URL, "")
+	if err != nil {
+		t.Errorf("Failed to build client config")
+	}
+	federationClientSet := federationclientset.NewForConfigOrDie(restclient.AddUserAgent(restClientCfg, "cluster-controller"))
+
+	manager := newClusterController(federationClientSet, 1*time.Millisecond)
+
+	stop := make(chan struct{})
+	manager.Run(stop)
+
+	// try to trigger the race in UpdateClusterStatus
+	for i := 0; i < 10; i++ {
+		manager.addToClusterSet(federationCluster)
+		manager.delFromClusterSet(federationCluster)
+	}
+
+	close(stop)
+}

vendor/k8s.io/kubernetes/federation/pkg/federation-controller/cluster/doc.go

@@ -0,0 +1,18 @@
+/*
+Copyright 2016 The Kubernetes Authors.
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+// Package cluster contains code for syncing cluster
+package cluster // import "k8s.io/kubernetes/federation/pkg/federation-controller/cluster"