Fix Godeps.json to point to kubernetes-1.12.7 tags

Automated cherry pick of #74636: Remove reflector metrics as they currently cause a memory

Kubernetes-commit: b17cdb9d0b95c4812325739f5fd40edd9e3daa4d

Godeps/Godeps.json

@@ -192,27 +192,27 @@
 		},
 		{
 			"ImportPath": "golang.org/x/net/context",
-			"Rev": "1c05540f6879653db88113bc4a2b70aec4bd491f"
+			"Rev": "0ed95abb35c445290478a5348a7b38bb154135fd"
 		},
 		{
 			"ImportPath": "golang.org/x/net/context/ctxhttp",
-			"Rev": "1c05540f6879653db88113bc4a2b70aec4bd491f"
+			"Rev": "0ed95abb35c445290478a5348a7b38bb154135fd"
 		},
 		{
 			"ImportPath": "golang.org/x/net/http2",
-			"Rev": "1c05540f6879653db88113bc4a2b70aec4bd491f"
+			"Rev": "0ed95abb35c445290478a5348a7b38bb154135fd"
 		},
 		{
 			"ImportPath": "golang.org/x/net/http2/hpack",
-			"Rev": "1c05540f6879653db88113bc4a2b70aec4bd491f"
+			"Rev": "0ed95abb35c445290478a5348a7b38bb154135fd"
 		},
 		{
 			"ImportPath": "golang.org/x/net/idna",
-			"Rev": "1c05540f6879653db88113bc4a2b70aec4bd491f"
+			"Rev": "0ed95abb35c445290478a5348a7b38bb154135fd"
 		},
 		{
 			"ImportPath": "golang.org/x/net/lex/httplex",
-			"Rev": "1c05540f6879653db88113bc4a2b70aec4bd491f"
+			"Rev": "0ed95abb35c445290478a5348a7b38bb154135fd"
 		},
 		{
 			"ImportPath": "golang.org/x/oauth2",
@@ -272,335 +272,335 @@
 		},
 		{
 			"ImportPath": "k8s.io/api/admissionregistration/v1alpha1",
-			"Rev": "b503174bad5991eb66f18247f52e41c3258f6348"
+			"Rev": "266ff08fa05d59ecd33aa08f9e2c1bae4ba7a444"
 		},
 		{
 			"ImportPath": "k8s.io/api/admissionregistration/v1beta1",
-			"Rev": "b503174bad5991eb66f18247f52e41c3258f6348"
+			"Rev": "266ff08fa05d59ecd33aa08f9e2c1bae4ba7a444"
 		},
 		{
 			"ImportPath": "k8s.io/api/apps/v1",
-			"Rev": "b503174bad5991eb66f18247f52e41c3258f6348"
+			"Rev": "266ff08fa05d59ecd33aa08f9e2c1bae4ba7a444"
 		},
 		{
 			"ImportPath": "k8s.io/api/apps/v1beta1",
-			"Rev": "b503174bad5991eb66f18247f52e41c3258f6348"
+			"Rev": "266ff08fa05d59ecd33aa08f9e2c1bae4ba7a444"
 		},
 		{
 			"ImportPath": "k8s.io/api/apps/v1beta2",
-			"Rev": "b503174bad5991eb66f18247f52e41c3258f6348"
+			"Rev": "266ff08fa05d59ecd33aa08f9e2c1bae4ba7a444"
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 		{
 			"ImportPath": "k8s.io/api/authentication/v1",
-			"Rev": "b503174bad5991eb66f18247f52e41c3258f6348"
+			"Rev": "266ff08fa05d59ecd33aa08f9e2c1bae4ba7a444"
 		},
 		{
 			"ImportPath": "k8s.io/api/authentication/v1beta1",
-			"Rev": "b503174bad5991eb66f18247f52e41c3258f6348"
+			"Rev": "266ff08fa05d59ecd33aa08f9e2c1bae4ba7a444"
 		},
 		{
 			"ImportPath": "k8s.io/api/authorization/v1",
-			"Rev": "b503174bad5991eb66f18247f52e41c3258f6348"
+			"Rev": "266ff08fa05d59ecd33aa08f9e2c1bae4ba7a444"
 		},
 		{
 			"ImportPath": "k8s.io/api/authorization/v1beta1",
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 		{
 			"ImportPath": "k8s.io/api/autoscaling/v1",
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 		},
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 			"ImportPath": "k8s.io/api/autoscaling/v2beta1",
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 		},
 		{
 			"ImportPath": "k8s.io/api/autoscaling/v2beta2",
-			"Rev": "b503174bad5991eb66f18247f52e41c3258f6348"
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 		},
 		{
 			"ImportPath": "k8s.io/api/batch/v1",
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 		},
 		{
 			"ImportPath": "k8s.io/api/batch/v1beta1",
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 		},
 		{
 			"ImportPath": "k8s.io/api/batch/v2alpha1",
-			"Rev": "b503174bad5991eb66f18247f52e41c3258f6348"
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 		},
 		{
 			"ImportPath": "k8s.io/api/certificates/v1beta1",
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 		{
 			"ImportPath": "k8s.io/api/coordination/v1beta1",
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 		},
 		{
 			"ImportPath": "k8s.io/api/core/v1",
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 		},
 		{
 			"ImportPath": "k8s.io/api/events/v1beta1",
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 		},
 		{
 			"ImportPath": "k8s.io/api/extensions/v1beta1",
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 		},
 		{
 			"ImportPath": "k8s.io/api/imagepolicy/v1alpha1",
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 		},
 		{
 			"ImportPath": "k8s.io/api/networking/v1",
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 		},
 		{
 			"ImportPath": "k8s.io/api/policy/v1beta1",
-			"Rev": "b503174bad5991eb66f18247f52e41c3258f6348"
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 		},
 		{
 			"ImportPath": "k8s.io/api/rbac/v1",
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 		},
 		{
 			"ImportPath": "k8s.io/api/rbac/v1alpha1",
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 		{
 			"ImportPath": "k8s.io/api/rbac/v1beta1",
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 		{
 			"ImportPath": "k8s.io/api/scheduling/v1alpha1",
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 			"ImportPath": "k8s.io/api/scheduling/v1beta1",
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 		{
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 		{
 			"ImportPath": "k8s.io/api/storage/v1",
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 		{
 			"ImportPath": "k8s.io/api/storage/v1alpha1",
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 		{
 			"ImportPath": "k8s.io/apimachinery/pkg/util/runtime",
-			"Rev": "eddba98df674a16931d2d4ba75edc3a389bf633a"
+			"Rev": "01f179d85dbce0f2e0e4351a92394b38694b7cae"
 		},
 		{
 			"ImportPath": "k8s.io/apimachinery/pkg/util/sets",
-			"Rev": "eddba98df674a16931d2d4ba75edc3a389bf633a"
+			"Rev": "01f179d85dbce0f2e0e4351a92394b38694b7cae"
 		},
 		{
 			"ImportPath": "k8s.io/apimachinery/pkg/util/strategicpatch",
-			"Rev": "eddba98df674a16931d2d4ba75edc3a389bf633a"
+			"Rev": "01f179d85dbce0f2e0e4351a92394b38694b7cae"
 		},
 		{
 			"ImportPath": "k8s.io/apimachinery/pkg/util/validation",
-			"Rev": "eddba98df674a16931d2d4ba75edc3a389bf633a"
+			"Rev": "01f179d85dbce0f2e0e4351a92394b38694b7cae"
 		},
 		{
 			"ImportPath": "k8s.io/apimachinery/pkg/util/validation/field",
-			"Rev": "eddba98df674a16931d2d4ba75edc3a389bf633a"
+			"Rev": "01f179d85dbce0f2e0e4351a92394b38694b7cae"
 		},
 		{
 			"ImportPath": "k8s.io/apimachinery/pkg/util/wait",
-			"Rev": "eddba98df674a16931d2d4ba75edc3a389bf633a"
+			"Rev": "01f179d85dbce0f2e0e4351a92394b38694b7cae"
 		},
 		{
 			"ImportPath": "k8s.io/apimachinery/pkg/util/yaml",
-			"Rev": "eddba98df674a16931d2d4ba75edc3a389bf633a"
+			"Rev": "01f179d85dbce0f2e0e4351a92394b38694b7cae"
 		},
 		{
 			"ImportPath": "k8s.io/apimachinery/pkg/version",
-			"Rev": "eddba98df674a16931d2d4ba75edc3a389bf633a"
+			"Rev": "01f179d85dbce0f2e0e4351a92394b38694b7cae"
 		},
 		{
 			"ImportPath": "k8s.io/apimachinery/pkg/watch",
-			"Rev": "eddba98df674a16931d2d4ba75edc3a389bf633a"
+			"Rev": "01f179d85dbce0f2e0e4351a92394b38694b7cae"
 		},
 		{
 			"ImportPath": "k8s.io/apimachinery/third_party/forked/golang/json",
-			"Rev": "eddba98df674a16931d2d4ba75edc3a389bf633a"
+			"Rev": "01f179d85dbce0f2e0e4351a92394b38694b7cae"
 		},
 		{
 			"ImportPath": "k8s.io/apimachinery/third_party/forked/golang/netutil",
-			"Rev": "eddba98df674a16931d2d4ba75edc3a389bf633a"
+			"Rev": "01f179d85dbce0f2e0e4351a92394b38694b7cae"
 		},
 		{
 			"ImportPath": "k8s.io/apimachinery/third_party/forked/golang/reflect",
-			"Rev": "eddba98df674a16931d2d4ba75edc3a389bf633a"
+			"Rev": "01f179d85dbce0f2e0e4351a92394b38694b7cae"
 		},
 		{
 			"ImportPath": "k8s.io/kube-openapi/pkg/util/proto",

dynamic/fake/simple.go

@@ -303,6 +303,7 @@ func (c *dynamicResourceClient) List(opts metav1.ListOptions) (*unstructured.Uns
 	}
 
 	list := &unstructured.UnstructuredList{}
+	list.SetResourceVersion(entireList.GetResourceVersion())
 	for i := range entireList.Items {
 		item := &entireList.Items[i]
 		metadata, err := meta.Accessor(item)

rest/config.go

@@ -70,6 +70,11 @@ type Config struct {
 	// TODO: demonstrate an OAuth2 compatible client.
 	BearerToken string
 
+	// Path to a file containing a BearerToken.
+	// If set, the contents are periodically read.
+	// The last successfully read value takes precedence over BearerToken.
+	BearerTokenFile string
+
 	// Impersonate is the configuration that RESTClient will use for impersonation.
 	Impersonate ImpersonationConfig
 
@@ -322,9 +327,8 @@ func InClusterConfig() (*Config, error) {
 		return nil, ErrNotInCluster
 	}
 
-	ts := newCachedPathTokenSource(tokenFile)
-
-	if _, err := ts.Token(); err != nil {
+	token, err := ioutil.ReadFile(tokenFile)
+	if err != nil {
 		return nil, err
 	}
 
@@ -340,7 +344,8 @@ func InClusterConfig() (*Config, error) {
 		// TODO: switch to using cluster DNS.
 		Host:            "https://" + net.JoinHostPort(host, port),
 		TLSClientConfig: tlsClientConfig,
-		WrapTransport:   TokenSourceWrapTransport(ts),
+		BearerToken:     string(token),
+		BearerTokenFile: tokenFile,
 	}, nil
 }
 
@@ -430,12 +435,13 @@ func AnonymousClientConfig(config *Config) *Config {
 // CopyConfig returns a copy of the given config
 func CopyConfig(config *Config) *Config {
 	return &Config{
-		Host:          config.Host,
-		APIPath:       config.APIPath,
-		ContentConfig: config.ContentConfig,
-		Username:      config.Username,
-		Password:      config.Password,
-		BearerToken:   config.BearerToken,
+		Host:            config.Host,
+		APIPath:         config.APIPath,
+		ContentConfig:   config.ContentConfig,
+		Username:        config.Username,
+		Password:        config.Password,
+		BearerToken:     config.BearerToken,
+		BearerTokenFile: config.BearerTokenFile,
 		Impersonate: ImpersonationConfig{
 			Groups:   config.Impersonate.Groups,
 			Extra:    config.Impersonate.Extra,

rest/config_test.go

@@ -264,6 +264,7 @@ func TestAnonymousConfig(t *testing.T) {
 		// is added to Config, update AnonymousClientConfig to preserve the field otherwise.
 		expected.Impersonate = ImpersonationConfig{}
 		expected.BearerToken = ""
+		expected.BearerTokenFile = ""
 		expected.Username = ""
 		expected.Password = ""
 		expected.AuthProvider = nil

tools/cache/reflector.go

@@ -24,10 +24,8 @@ import (
 	"net"
 	"net/url"
 	"reflect"
-	"strconv"
 	"strings"
 	"sync"
-	"sync/atomic"
 	"syscall"
 	"time"
 
@@ -95,17 +93,10 @@ func NewReflector(lw ListerWatcher, expectedType interface{}, store Store, resyn
 	return NewNamedReflector(naming.GetNameFromCallsite(internalPackages...), lw, expectedType, store, resyncPeriod)
 }
 
-// reflectorDisambiguator is used to disambiguate started reflectors.
-// initialized to an unstable value to ensure meaning isn't attributed to the suffix.
-var reflectorDisambiguator = int64(time.Now().UnixNano() % 12345)
-
 // NewNamedReflector same as NewReflector, but with a specified name for logging
 func NewNamedReflector(name string, lw ListerWatcher, expectedType interface{}, store Store, resyncPeriod time.Duration) *Reflector {
-	reflectorSuffix := atomic.AddInt64(&reflectorDisambiguator, 1)
 	r := &Reflector{
-		name: name,
-		// we need this to be unique per process (some names are still the same) but obvious who it belongs to
-		metrics:       newReflectorMetrics(makeValidPrometheusMetricLabel(fmt.Sprintf("reflector_"+name+"_%d", reflectorSuffix))),
+		name:          name,
 		listerWatcher: lw,
 		store:         store,
 		expectedType:  reflect.TypeOf(expectedType),
@@ -173,13 +164,10 @@ func (r *Reflector) ListAndWatch(stopCh <-chan struct{}) error {
 	// to be served from cache and potentially be delayed relative to
 	// etcd contents. Reflector framework will catch up via Watch() eventually.
 	options := metav1.ListOptions{ResourceVersion: "0"}
-	r.metrics.numberOfLists.Inc()
-	start := r.clock.Now()
 	list, err := r.listerWatcher.List(options)
 	if err != nil {
 		return fmt.Errorf("%s: Failed to list %v: %v", r.name, r.expectedType, err)
 	}
-	r.metrics.listDuration.Observe(time.Since(start).Seconds())
 	listMetaInterface, err := meta.ListAccessor(list)
 	if err != nil {
 		return fmt.Errorf("%s: Unable to understand list result %#v: %v", r.name, list, err)
@@ -189,7 +177,6 @@ func (r *Reflector) ListAndWatch(stopCh <-chan struct{}) error {
 	if err != nil {
 		return fmt.Errorf("%s: Unable to understand list result %#v (%v)", r.name, list, err)
 	}
-	r.metrics.numberOfItemsInList.Observe(float64(len(items)))
 	if err := r.syncWith(items, resourceVersion); err != nil {
 		return fmt.Errorf("%s: Unable to sync list result: %v", r.name, err)
 	}
@@ -239,7 +226,6 @@ func (r *Reflector) ListAndWatch(stopCh <-chan struct{}) error {
 			TimeoutSeconds: &timeoutSeconds,
 		}
 
-		r.metrics.numberOfWatches.Inc()
 		w, err := r.listerWatcher.Watch(options)
 		if err != nil {
 			switch err {
@@ -291,11 +277,6 @@ func (r *Reflector) watchHandler(w watch.Interface, resourceVersion *string, err
 	// Stopping the watcher should be idempotent and if we return from this function there's no way
 	// we're coming back in with the same watch interface.
 	defer w.Stop()
-	// update metrics
-	defer func() {
-		r.metrics.numberOfItemsInWatch.Observe(float64(eventCount))
-		r.metrics.watchDuration.Observe(time.Since(start).Seconds())
-	}()
 
 loop:
 	for {
@@ -351,7 +332,6 @@ loop:
 
 	watchDuration := r.clock.Now().Sub(start)
 	if watchDuration < 1*time.Second && eventCount == 0 {
-		r.metrics.numberOfShortWatches.Inc()
 		return fmt.Errorf("very short watch: %s: Unexpected watch close - watch lasted less than a second and no items received", r.name)
 	}
 	glog.V(4).Infof("%s: Watch close - %v total %v items received", r.name, r.expectedType, eventCount)
@@ -370,9 +350,4 @@ func (r *Reflector) setLastSyncResourceVersion(v string) {
 	r.lastSyncResourceVersionMutex.Lock()
 	defer r.lastSyncResourceVersionMutex.Unlock()
 	r.lastSyncResourceVersion = v
-
-	rv, err := strconv.Atoi(v)
-	if err == nil {
-		r.metrics.lastResourceVersion.Set(float64(rv))
-	}
 }

tools/clientcmd/client_config.go

@@ -234,6 +234,7 @@ func (config *DirectClientConfig) getUserIdentificationPartialConfig(configAuthI
 			return nil, err
 		}
 		mergedConfig.BearerToken = string(tokenBytes)
+		mergedConfig.BearerTokenFile = configAuthInfo.TokenFile
 	}
 	if len(configAuthInfo.Impersonate) > 0 {
 		mergedConfig.Impersonate = restclient.ImpersonationConfig{

tools/leaderelection/healthzadaptor.go

@@ -0,0 +1,69 @@
+/*
+Copyright 2015 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 leaderelection
+
+import (
+	"net/http"
+	"sync"
+	"time"
+)
+
+// HealthzAdaptor associates the /healthz endpoint with the LeaderElection object.
+// It helps deal with the /healthz endpoint being set up prior to the LeaderElection.
+// This contains the code needed to act as an adaptor between the leader
+// election code the health check code. It allows us to provide health
+// status about the leader election. Most specifically about if the leader
+// has failed to renew without exiting the process. In that case we should
+// report not healthy and rely on the kubelet to take down the process.
+type HealthzAdaptor struct {
+	pointerLock sync.Mutex
+	le          *LeaderElector
+	timeout     time.Duration
+}
+
+// Name returns the name of the health check we are implementing.
+func (l *HealthzAdaptor) Name() string {
+	return "leaderElection"
+}
+
+// Check is called by the healthz endpoint handler.
+// It fails (returns an error) if we own the lease but had not been able to renew it.
+func (l *HealthzAdaptor) Check(req *http.Request) error {
+	l.pointerLock.Lock()
+	defer l.pointerLock.Unlock()
+	if l.le == nil {
+		return nil
+	}
+	return l.le.Check(l.timeout)
+}
+
+// SetLeaderElection ties a leader election object to a HealthzAdaptor
+func (l *HealthzAdaptor) SetLeaderElection(le *LeaderElector) {
+	l.pointerLock.Lock()
+	defer l.pointerLock.Unlock()
+	l.le = le
+}
+
+// NewLeaderHealthzAdaptor creates a basic healthz adaptor to monitor a leader election.
+// timeout determines the time beyond the lease expiry to be allowed for timeout.
+// checks within the timeout period after the lease expires will still return healthy.
+func NewLeaderHealthzAdaptor(timeout time.Duration) *HealthzAdaptor {
+	result := &HealthzAdaptor{
+		timeout: timeout,
+	}
+	return result
+}

tools/leaderelection/healthzadaptor_test.go

@@ -0,0 +1,175 @@
+/*
+Copyright 2015 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 leaderelection
+
+import (
+	"fmt"
+	"testing"
+	"time"
+
+	"k8s.io/apimachinery/pkg/util/clock"
+	rl "k8s.io/client-go/tools/leaderelection/resourcelock"
+	"net/http"
+)
+
+type fakeLock struct {
+	identity string
+}
+
+// Get is a dummy to allow us to have a fakeLock for testing.
+func (fl *fakeLock) Get() (ler *rl.LeaderElectionRecord, err error) {
+	return nil, nil
+}
+
+// Create is a dummy to allow us to have a fakeLock for testing.
+func (fl *fakeLock) Create(ler rl.LeaderElectionRecord) error {
+	return nil
+}
+
+// Update is a dummy to allow us to have a fakeLock for testing.
+func (fl *fakeLock) Update(ler rl.LeaderElectionRecord) error {
+	return nil
+}
+
+// RecordEvent is a dummy to allow us to have a fakeLock for testing.
+func (fl *fakeLock) RecordEvent(string) {}
+
+// Identity is a dummy to allow us to have a fakeLock for testing.
+func (fl *fakeLock) Identity() string {
+	return fl.identity
+}
+
+// Describe is a dummy to allow us to have a fakeLock for testing.
+func (fl *fakeLock) Describe() string {
+	return "Dummy implementation of lock for testing"
+}
+
+// TestLeaderElectionHealthChecker tests that the healthcheck for leader election handles its edge cases.
+func TestLeaderElectionHealthChecker(t *testing.T) {
+	current := time.Now()
+	req := &http.Request{}
+
+	tests := []struct {
+		description    string
+		expected       error
+		adaptorTimeout time.Duration
+		elector        *LeaderElector
+	}{
+		{
+			description:    "call check before leader elector initialized",
+			expected:       nil,
+			adaptorTimeout: time.Second * 20,
+			elector:        nil,
+		},
+		{
+			description:    "call check when the the lease is far expired",
+			expected:       fmt.Errorf("failed election to renew leadership on lease %s", "foo"),
+			adaptorTimeout: time.Second * 20,
+			elector: &LeaderElector{
+				config: LeaderElectionConfig{
+					Lock:          &fakeLock{identity: "healthTest"},
+					LeaseDuration: time.Minute,
+					Name:          "foo",
+				},
+				observedRecord: rl.LeaderElectionRecord{
+					HolderIdentity: "healthTest",
+				},
+				observedTime: current,
+				clock:        clock.NewFakeClock(current.Add(time.Hour)),
+			},
+		},
+		{
+			description:    "call check when the the lease is far expired but held by another server",
+			expected:       nil,
+			adaptorTimeout: time.Second * 20,
+			elector: &LeaderElector{
+				config: LeaderElectionConfig{
+					Lock:          &fakeLock{identity: "healthTest"},
+					LeaseDuration: time.Minute,
+					Name:          "foo",
+				},
+				observedRecord: rl.LeaderElectionRecord{
+					HolderIdentity: "otherServer",
+				},
+				observedTime: current,
+				clock:        clock.NewFakeClock(current.Add(time.Hour)),
+			},
+		},
+		{
+			description:    "call check when the the lease is not expired",
+			expected:       nil,
+			adaptorTimeout: time.Second * 20,
+			elector: &LeaderElector{
+				config: LeaderElectionConfig{
+					Lock:          &fakeLock{identity: "healthTest"},
+					LeaseDuration: time.Minute,
+					Name:          "foo",
+				},
+				observedRecord: rl.LeaderElectionRecord{
+					HolderIdentity: "healthTest",
+				},
+				observedTime: current,
+				clock:        clock.NewFakeClock(current),
+			},
+		},
+		{
+			description:    "call check when the the lease is expired but inside the timeout",
+			expected:       nil,
+			adaptorTimeout: time.Second * 20,
+			elector: &LeaderElector{
+				config: LeaderElectionConfig{
+					Lock:          &fakeLock{identity: "healthTest"},
+					LeaseDuration: time.Minute,
+					Name:          "foo",
+				},
+				observedRecord: rl.LeaderElectionRecord{
+					HolderIdentity: "healthTest",
+				},
+				observedTime: current,
+				clock:        clock.NewFakeClock(current.Add(time.Minute).Add(time.Second)),
+			},
+		},
+	}
+
+	for _, test := range tests {
+		adaptor := NewLeaderHealthzAdaptor(test.adaptorTimeout)
+		if adaptor.le != nil {
+			t.Errorf("[%s] leaderChecker started with a LeaderElector %v", test.description, adaptor.le)
+		}
+		if test.elector != nil {
+			test.elector.config.WatchDog = adaptor
+			adaptor.SetLeaderElection(test.elector)
+			if adaptor.le == nil {
+				t.Errorf("[%s] adaptor failed to set the LeaderElector", test.description)
+			}
+		}
+		err := adaptor.Check(req)
+		if test.expected == nil {
+			if err == nil {
+				continue
+			}
+			t.Errorf("[%s] called check, expected no error but received \"%v\"", test.description, err)
+		} else {
+			if err == nil {
+				t.Errorf("[%s] called check and failed to received the expected error \"%v\"", test.description, test.expected)
+			}
+			if err.Error() != test.expected.Error() {
+				t.Errorf("[%s] called check, expected %v, received %v", test.description, test.expected, err)
+			}
+		}
+	}
+}

tools/leaderelection/leaderelection.go

@@ -56,6 +56,7 @@ import (
 
 	"k8s.io/apimachinery/pkg/api/errors"
 	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
+	"k8s.io/apimachinery/pkg/util/clock"
 	"k8s.io/apimachinery/pkg/util/runtime"
 	"k8s.io/apimachinery/pkg/util/wait"
 	rl "k8s.io/client-go/tools/leaderelection/resourcelock"
@@ -90,6 +91,7 @@ func NewLeaderElector(lec LeaderElectionConfig) (*LeaderElector, error) {
 	}
 	return &LeaderElector{
 		config: lec,
+		clock:  clock.RealClock{},
 	}, nil
 }
 
@@ -111,6 +113,13 @@ type LeaderElectionConfig struct {
 	// Callbacks are callbacks that are triggered during certain lifecycle
 	// events of the LeaderElector
 	Callbacks LeaderCallbacks
+
+	// WatchDog is the associated health checker
+	// WatchDog may be null if its not needed/configured.
+	WatchDog *HealthzAdaptor
+
+	// Name is the name of the resource lock for debugging
+	Name string
 }
 
 // LeaderCallbacks are callbacks that are triggered during certain
@@ -139,6 +148,12 @@ type LeaderElector struct {
 	// value observedRecord.HolderIdentity if the transition has
 	// not yet been reported.
 	reportedLeader string
+
+	// clock is wrapper around time to allow for less flaky testing
+	clock clock.Clock
+
+	// name is the name of the resource lock for debugging
+	name string
 }
 
 // Run starts the leader election loop
@@ -163,6 +178,9 @@ func RunOrDie(ctx context.Context, lec LeaderElectionConfig) {
 	if err != nil {
 		panic(err)
 	}
+	if lec.WatchDog != nil {
+		lec.WatchDog.SetLeaderElection(le)
+	}
 	le.Run(ctx)
 }
 
@@ -257,14 +275,14 @@ func (le *LeaderElector) tryAcquireOrRenew() bool {
 			return false
 		}
 		le.observedRecord = leaderElectionRecord
-		le.observedTime = time.Now()
+		le.observedTime = le.clock.Now()
 		return true
 	}
 
 	// 2. Record obtained, check the Identity & Time
 	if !reflect.DeepEqual(le.observedRecord, *oldLeaderElectionRecord) {
 		le.observedRecord = *oldLeaderElectionRecord
-		le.observedTime = time.Now()
+		le.observedTime = le.clock.Now()
 	}
 	if le.observedTime.Add(le.config.LeaseDuration).After(now.Time) &&
 		!le.IsLeader() {
@@ -287,7 +305,7 @@ func (le *LeaderElector) tryAcquireOrRenew() bool {
 		return false
 	}
 	le.observedRecord = leaderElectionRecord
-	le.observedTime = time.Now()
+	le.observedTime = le.clock.Now()
 	return true
 }
 
@@ -300,3 +318,19 @@ func (le *LeaderElector) maybeReportTransition() {
 		go le.config.Callbacks.OnNewLeader(le.reportedLeader)
 	}
 }
+
+// Check will determine if the current lease is expired by more than timeout.
+func (le *LeaderElector) Check(maxTolerableExpiredLease time.Duration) error {
+	if !le.IsLeader() {
+		// Currently not concerned with the case that we are hot standby
+		return nil
+	}
+	// If we are more than timeout seconds after the lease duration that is past the timeout
+	// on the lease renew. Time to start reporting ourselves as unhealthy. We should have
+	// died but conditions like deadlock can prevent this. (See #70819)
+	if le.clock.Since(le.observedTime) > le.config.LeaseDuration+maxTolerableExpiredLease {
+		return fmt.Errorf("failed election to renew leadership on lease %s", le.config.Name)
+	}
+
+	return nil
+}

tools/leaderelection/leaderelection_test.go

@@ -26,6 +26,7 @@ import (
 	"k8s.io/apimachinery/pkg/api/errors"
 	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
 	"k8s.io/apimachinery/pkg/runtime"
+	"k8s.io/apimachinery/pkg/util/clock"
 	fakecorev1 "k8s.io/client-go/kubernetes/typed/core/v1/fake"
 	core "k8s.io/client-go/testing"
 	rl "k8s.io/client-go/tools/leaderelection/resourcelock"
@@ -257,6 +258,7 @@ func testTryAcquireOrRenew(t *testing.T, objectType string) {
 			config:         lec,
 			observedRecord: test.observedRecord,
 			observedTime:   test.observedTime,
+			clock:          clock.RealClock{},
 		}
 
 		if test.expectSuccess != le.tryAcquireOrRenew() {

transport/config.go

@@ -39,6 +39,11 @@ type Config struct {
 	// Bearer token for authentication
 	BearerToken string
 
+	// Path to a file containing a BearerToken.
+	// If set, the contents are periodically read.
+	// The last successfully read value takes precedence over BearerToken.
+	BearerTokenFile string
+
 	// Impersonate is the config that this Config will impersonate using
 	Impersonate ImpersonationConfig
 
@@ -80,7 +85,7 @@ func (c *Config) HasBasicAuth() bool {
 
 // HasTokenAuth returns whether the configuration has token authentication or not.
 func (c *Config) HasTokenAuth() bool {
-	return len(c.BearerToken) != 0
+	return len(c.BearerToken) != 0 || len(c.BearerTokenFile) != 0
 }
 
 // HasCertAuth returns whether the configuration has certificate authentication or not.

transport/round_trippers.go

@@ -23,6 +23,7 @@ import (
 	"time"
 
 	"github.com/golang/glog"
+	"golang.org/x/oauth2"
 
 	utilnet "k8s.io/apimachinery/pkg/util/net"
 )
@@ -44,7 +45,11 @@ func HTTPWrappersForConfig(config *Config, rt http.RoundTripper) (http.RoundTrip
 	case config.HasBasicAuth() && config.HasTokenAuth():
 		return nil, fmt.Errorf("username/password or bearer token may be set, but not both")
 	case config.HasTokenAuth():
-		rt = NewBearerAuthRoundTripper(config.BearerToken, rt)
+		var err error
+		rt, err = NewBearerAuthWithRefreshRoundTripper(config.BearerToken, config.BearerTokenFile, rt)
+		if err != nil {
+			return nil, err
+		}
 	case config.HasBasicAuth():
 		rt = NewBasicAuthRoundTripper(config.Username, config.Password, rt)
 	}
@@ -265,13 +270,35 @@ func (rt *impersonatingRoundTripper) WrappedRoundTripper() http.RoundTripper { r
 
 type bearerAuthRoundTripper struct {
 	bearer string
+	source oauth2.TokenSource
 	rt     http.RoundTripper
 }
 
 // NewBearerAuthRoundTripper adds the provided bearer token to a request
 // unless the authorization header has already been set.
 func NewBearerAuthRoundTripper(bearer string, rt http.RoundTripper) http.RoundTripper {
-	return &bearerAuthRoundTripper{bearer, rt}
+	return &bearerAuthRoundTripper{bearer, nil, rt}
+}
+
+// NewBearerAuthRoundTripper adds the provided bearer token to a request
+// unless the authorization header has already been set.
+// If tokenFile is non-empty, it is periodically read,
+// and the last successfully read content is used as the bearer token.
+// If tokenFile is non-empty and bearer is empty, the tokenFile is read
+// immediately to populate the initial bearer token.
+func NewBearerAuthWithRefreshRoundTripper(bearer string, tokenFile string, rt http.RoundTripper) (http.RoundTripper, error) {
+	if len(tokenFile) == 0 {
+		return &bearerAuthRoundTripper{bearer, nil, rt}, nil
+	}
+	source := NewCachedFileTokenSource(tokenFile)
+	if len(bearer) == 0 {
+		token, err := source.Token()
+		if err != nil {
+			return nil, err
+		}
+		bearer = token.AccessToken
+	}
+	return &bearerAuthRoundTripper{bearer, source, rt}, nil
 }
 
 func (rt *bearerAuthRoundTripper) RoundTrip(req *http.Request) (*http.Response, error) {
@@ -280,7 +307,13 @@ func (rt *bearerAuthRoundTripper) RoundTrip(req *http.Request) (*http.Response,
 	}
 
 	req = utilnet.CloneRequest(req)
-	req.Header.Set("Authorization", fmt.Sprintf("Bearer %s", rt.bearer))
+	token := rt.bearer
+	if rt.source != nil {
+		if refreshedToken, err := rt.source.Token(); err == nil {
+			token = refreshedToken.AccessToken
+		}
+	}
+	req.Header.Set("Authorization", fmt.Sprintf("Bearer %s", token))
 	return rt.rt.RoundTrip(req)
 }
 

transport/token_source.go

@@ -14,7 +14,7 @@ See the License for the specific language governing permissions and
 limitations under the License.
 */
 
-package rest
+package transport
 
 import (
 	"fmt"
@@ -42,17 +42,19 @@ func TokenSourceWrapTransport(ts oauth2.TokenSource) func(http.RoundTripper) htt
 	}
 }
 
-func newCachedPathTokenSource(path string) oauth2.TokenSource {
+// NewCachedFileTokenSource returns a oauth2.TokenSource reads a token from a
+// file at a specified path and periodically reloads it.
+func NewCachedFileTokenSource(path string) oauth2.TokenSource {
 	return &cachingTokenSource{
 		now:    time.Now,
-		leeway: 1 * time.Minute,
+		leeway: 10 * time.Second,
 		base: &fileTokenSource{
 			path: path,
-			// This period was picked because it is half of the minimum validity
-			// duration for a token provisioned by they TokenRequest API. This is
-			// unsophisticated and should induce rotation at a frequency that should
-			// work with the token volume source.
-			period: 5 * time.Minute,
+			// This period was picked because it is half of the duration between when the kubelet
+			// refreshes a projected service account token and when the original token expires.
+			// Default token lifetime is 10 minutes, and the kubelet starts refreshing at 80% of lifetime.
+			// This should induce re-reading at a frequency that works with the token volume source.
+			period: time.Minute,
 		},
 	}
 }

transport/token_source_test.go

@@ -14,7 +14,7 @@ See the License for the specific language governing permissions and
 limitations under the License.
 */
 
-package rest
+package transport
 
 import (
 	"fmt"