Merge pull request #61894 from atlassian/misc-cleanups

Automatic merge from submit-queue (batch tested with PRs 61894, 61369). If you want to cherry-pick this change to another branch, please follow the instructions <a href="https://github.com/kubernetes/community/blob/master/contributors/devel/cherry-picks.md">here</a>.

Use range in loops; misc fixes

**What this PR does / why we need it**:
It is cleaner to use `range` in for loops to iterate over channel until it is closed.

**Release note**:
```release-note
NONE
```
/kind cleanup

pkg/kubelet/container/resize.go

@@ -32,11 +32,7 @@ func HandleResizing(resize <-chan remotecommand.TerminalSize, resizeFunc func(si
 	go func() {
 		defer runtime.HandleCrash()
 
-		for {
-			size, ok := <-resize
-			if !ok {
-				return
-			}
+		for size := range resize {
 			if size.Height < 1 || size.Width < 1 {
 				continue
 			}

pkg/kubelet/kubelet_pods.go

@@ -1097,35 +1097,28 @@ func (kl *Kubelet) podKiller() {
 	killing := sets.NewString()
 	// guard for the killing set
 	lock := sync.Mutex{}
-	for {
-		select {
-		case podPair, ok := <-kl.podKillingCh:
-			if !ok {
-				return
-			}
+	for podPair := range kl.podKillingCh {
+		runningPod := podPair.RunningPod
+		apiPod := podPair.APIPod
 
-			runningPod := podPair.RunningPod
-			apiPod := podPair.APIPod
+		lock.Lock()
+		exists := killing.Has(string(runningPod.ID))
+		if !exists {
+			killing.Insert(string(runningPod.ID))
+		}
+		lock.Unlock()
 
-			lock.Lock()
-			exists := killing.Has(string(runningPod.ID))
-			if !exists {
-				killing.Insert(string(runningPod.ID))
-			}
-			lock.Unlock()
-
-			if !exists {
-				go func(apiPod *v1.Pod, runningPod *kubecontainer.Pod) {
-					glog.V(2).Infof("Killing unwanted pod %q", runningPod.Name)
-					err := kl.killPod(apiPod, runningPod, nil, nil)
-					if err != nil {
-						glog.Errorf("Failed killing the pod %q: %v", runningPod.Name, err)
-					}
-					lock.Lock()
-					killing.Delete(string(runningPod.ID))
-					lock.Unlock()
-				}(apiPod, runningPod)
-			}
+		if !exists {
+			go func(apiPod *v1.Pod, runningPod *kubecontainer.Pod) {
+				glog.V(2).Infof("Killing unwanted pod %q", runningPod.Name)
+				err := kl.killPod(apiPod, runningPod, nil, nil)
+				if err != nil {
+					glog.Errorf("Failed killing the pod %q: %v", runningPod.Name, err)
+				}
+				lock.Lock()
+				killing.Delete(string(runningPod.ID))
+				lock.Unlock()
+			}(apiPod, runningPod)
 		}
 	}
 }

pkg/kubelet/pod_container_deletor.go

@@ -45,10 +45,8 @@ func newPodContainerDeletor(runtime kubecontainer.Runtime, containersToKeep int)
 	buffer := make(chan kubecontainer.ContainerID, containerDeletorBufferLimit)
 	go wait.Until(func() {
 		for {
-			select {
-			case id := <-buffer:
-				runtime.DeleteContainer(id)
-			}
+			id := <-buffer
+			runtime.DeleteContainer(id)
 		}
 	}, 0, wait.NeverStop)
 

pkg/volume/util/recyclerclient/recycler_client.go

@@ -226,7 +226,7 @@ func (c *realRecyclerClient) WatchPod(name, namespace string, stopChannel chan s
 		var eventWatchChannelClosed bool
 		for {
 			select {
-			case _ = <-stopChannel:
+			case <-stopChannel:
 				return
 
 			case podEvent, ok := <-podWatch.ResultChan():

staging/src/k8s.io/apimachinery/pkg/watch/filter.go

@@ -62,11 +62,7 @@ func (fw *filteredWatch) Stop() {
 // loop waits for new values, filters them, and resends them.
 func (fw *filteredWatch) loop() {
 	defer close(fw.result)
-	for {
-		event, ok := <-fw.incoming.ResultChan()
-		if !ok {
-			break
-		}
+	for event := range fw.incoming.ResultChan() {
 		filtered, keep := fw.f(event)
 		if keep {
 			fw.result <- filtered

staging/src/k8s.io/apimachinery/pkg/watch/mux.go

@@ -204,11 +204,7 @@ func (m *Broadcaster) Shutdown() {
 func (m *Broadcaster) loop() {
 	// Deliberately not catching crashes here. Yes, bring down the process if there's a
 	// bug in watch.Broadcaster.
-	for {
-		event, ok := <-m.incoming
-		if !ok {
-			break
-		}
+	for event := range m.incoming {
 		if event.Type == internalRunFunctionMarker {
 			event.Object.(functionFakeRuntimeObject)()
 			continue

staging/src/k8s.io/apiserver/pkg/registry/generic/registry/store.go

@@ -445,6 +445,7 @@ func (e *Store) WaitForInitialized(ctx genericapirequest.Context, obj runtime.Ob
 				}
 			}
 		case <-ctx.Done():
+			return nil, ctx.Err()
 		}
 	}
 }
@@ -1070,11 +1071,7 @@ func (e *Store) DeleteCollection(ctx genericapirequest.Context, options *metav1.
 			})
 			defer wg.Done()
 
-			for {
-				index, ok := <-toProcess
-				if !ok {
-					return
-				}
+			for index := range toProcess {
 				accessor, err := meta.Accessor(items[index])
 				if err != nil {
 					errs <- err

staging/src/k8s.io/client-go/tools/record/event.go

@@ -225,11 +225,7 @@ func (eventBroadcaster *eventBroadcasterImpl) StartEventWatcher(eventHandler fun
 	watcher := eventBroadcaster.Watch()
 	go func() {
 		defer utilruntime.HandleCrash()
-		for {
-			watchEvent, open := <-watcher.ResultChan()
-			if !open {
-				return
-			}
+		for watchEvent := range watcher.ResultChan() {
 			event, ok := watchEvent.Object.(*v1.Event)
 			if !ok {
 				// This is all local, so there's no reason this should

test/e2e/apimachinery/watch.go

@@ -192,6 +192,7 @@ func expectNoEvent(w watch.Interface, eventType watch.EventType, object runtime.
 
 func waitForEvent(w watch.Interface, expectType watch.EventType, expectObject runtime.Object) (watch.Event, bool) {
 	stopTimer := time.NewTimer(1 * time.Minute)
+	defer stopTimer.Stop()
 	for {
 		select {
 		case actual := <-w.ResultChan():