rebase: update kubernetes to v1.25.0

update kubernetes to latest v1.25.0
release.

Signed-off-by: Madhu Rajanna <madhupr007@gmail.com>

vendor/k8s.io/apimachinery/pkg/watch/mux.go

@@ -17,6 +17,7 @@ limitations under the License.
 package watch
 
 import (
+	"fmt"
 	"sync"
 
 	"k8s.io/apimachinery/pkg/runtime"
@@ -44,8 +45,11 @@ type Broadcaster struct {
 	nextWatcher  int64
 	distributing sync.WaitGroup
 
-	incoming chan Event
-	stopped  chan struct{}
+	// incomingBlock allows us to ensure we don't race and end up sending events
+	// to a closed channel following a broadcaster shutdown.
+	incomingBlock sync.Mutex
+	incoming      chan Event
+	stopped       chan struct{}
 
 	// How large to make watcher's channel.
 	watchQueueLength int
@@ -111,6 +115,8 @@ func (obj functionFakeRuntimeObject) DeepCopyObject() runtime.Object {
 // won't ever see that event, and will always see any event after they are
 // added.
 func (m *Broadcaster) blockQueue(f func()) {
+	m.incomingBlock.Lock()
+	defer m.incomingBlock.Unlock()
 	select {
 	case <-m.stopped:
 		return
@@ -132,7 +138,7 @@ func (m *Broadcaster) blockQueue(f func()) {
 // Note: new watchers will only receive new events. They won't get an entire history
 // of previous events. It will block until the watcher is actually added to the
 // broadcaster.
-func (m *Broadcaster) Watch() Interface {
+func (m *Broadcaster) Watch() (Interface, error) {
 	var w *broadcasterWatcher
 	m.blockQueue(func() {
 		id := m.nextWatcher
@@ -146,11 +152,9 @@ func (m *Broadcaster) Watch() Interface {
 		m.watchers[id] = w
 	})
 	if w == nil {
-		// The panic here is to be consistent with the previous interface behavior
-		// we are willing to re-evaluate in the future.
-		panic("broadcaster already stopped")
+		return nil, fmt.Errorf("broadcaster already stopped")
 	}
-	return w
+	return w, nil
 }
 
 // WatchWithPrefix adds a new watcher to the list and returns an Interface for it. It sends
@@ -158,7 +162,7 @@ func (m *Broadcaster) Watch() Interface {
 // The returned watch will have a queue length that is at least large enough to accommodate
 // all of the items in queuedEvents. It will block until the watcher is actually added to
 // the broadcaster.
-func (m *Broadcaster) WatchWithPrefix(queuedEvents []Event) Interface {
+func (m *Broadcaster) WatchWithPrefix(queuedEvents []Event) (Interface, error) {
 	var w *broadcasterWatcher
 	m.blockQueue(func() {
 		id := m.nextWatcher
@@ -179,11 +183,9 @@ func (m *Broadcaster) WatchWithPrefix(queuedEvents []Event) Interface {
 		}
 	})
 	if w == nil {
-		// The panic here is to be consistent with the previous interface behavior
-		// we are willing to re-evaluate in the future.
-		panic("broadcaster already stopped")
+		return nil, fmt.Errorf("broadcaster already stopped")
 	}
-	return w
+	return w, nil
 }
 
 // stopWatching stops the given watcher and removes it from the list.
@@ -210,19 +212,38 @@ func (m *Broadcaster) closeAll() {
 }
 
 // Action distributes the given event among all watchers.
-func (m *Broadcaster) Action(action EventType, obj runtime.Object) {
+func (m *Broadcaster) Action(action EventType, obj runtime.Object) error {
+	m.incomingBlock.Lock()
+	defer m.incomingBlock.Unlock()
+	select {
+	case <-m.stopped:
+		return fmt.Errorf("broadcaster already stopped")
+	default:
+	}
+
 	m.incoming <- Event{action, obj}
+	return nil
 }
 
 // Action distributes the given event among all watchers, or drops it on the floor
 // if too many incoming actions are queued up.  Returns true if the action was sent,
 // false if dropped.
-func (m *Broadcaster) ActionOrDrop(action EventType, obj runtime.Object) bool {
+func (m *Broadcaster) ActionOrDrop(action EventType, obj runtime.Object) (bool, error) {
+	m.incomingBlock.Lock()
+	defer m.incomingBlock.Unlock()
+
+	// Ensure that if the broadcaster is stopped we do not send events to it.
+	select {
+	case <-m.stopped:
+		return false, fmt.Errorf("broadcaster already stopped")
+	default:
+	}
+
 	select {
 	case m.incoming <- Event{action, obj}:
-		return true
+		return true, nil
 	default:
-		return false
+		return false, nil
 	}
 }