Update vendored dependencies

vendor/k8s.io/client-go/tools/cache/shared_informer.go

@@ -28,35 +28,37 @@ import (
 	"k8s.io/apimachinery/pkg/util/wait"
 	"k8s.io/utils/buffer"
 
-	"k8s.io/klog"
+	"k8s.io/klog/v2"
 )
 
 // SharedInformer provides eventually consistent linkage of its
 // clients to the authoritative state of a given collection of
 // objects.  An object is identified by its API group, kind/resource,
-// namespace, and name; the `ObjectMeta.UID` is not part of an
-// object's ID as far as this contract is concerned.  One
+// namespace (if any), and name; the `ObjectMeta.UID` is not part of
+// an object's ID as far as this contract is concerned.  One
 // SharedInformer provides linkage to objects of a particular API
 // group and kind/resource.  The linked object collection of a
-// SharedInformer may be further restricted to one namespace and/or by
-// label selector and/or field selector.
+// SharedInformer may be further restricted to one namespace (if
+// applicable) and/or by label selector and/or field selector.
 //
 // The authoritative state of an object is what apiservers provide
 // access to, and an object goes through a strict sequence of states.
-// An object state is either "absent" or present with a
-// ResourceVersion and other appropriate content.
+// An object state is either (1) present with a ResourceVersion and
+// other appropriate content or (2) "absent".
 //
-// A SharedInformer maintains a local cache, exposed by GetStore() and
-// by GetIndexer() in the case of an indexed informer, of the state of
-// each relevant object.  This cache is eventually consistent with the
-// authoritative state.  This means that, unless prevented by
-// persistent communication problems, if ever a particular object ID X
-// is authoritatively associated with a state S then for every
-// SharedInformer I whose collection includes (X, S) eventually either
-// (1) I's cache associates X with S or a later state of X, (2) I is
-// stopped, or (3) the authoritative state service for X terminates.
-// To be formally complete, we say that the absent state meets any
-// restriction by label selector or field selector.
+// A SharedInformer maintains a local cache --- exposed by GetStore(),
+// by GetIndexer() in the case of an indexed informer, and possibly by
+// machinery involved in creating and/or accessing the informer --- of
+// the state of each relevant object.  This cache is eventually
+// consistent with the authoritative state.  This means that, unless
+// prevented by persistent communication problems, if ever a
+// particular object ID X is authoritatively associated with a state S
+// then for every SharedInformer I whose collection includes (X, S)
+// eventually either (1) I's cache associates X with S or a later
+// state of X, (2) I is stopped, or (3) the authoritative state
+// service for X terminates.  To be formally complete, we say that the
+// absent state meets any restriction by label selector or field
+// selector.
 //
 // For a given informer and relevant object ID X, the sequence of
 // states that appears in the informer's cache is a subsequence of the
@@ -98,7 +100,7 @@ import (
 // added before `Run()`, eventually either the SharedInformer is
 // stopped or the client is notified of the update.  A client added
 // after `Run()` starts gets a startup batch of notifications of
-// additions of the object existing in the cache at the time that
+// additions of the objects existing in the cache at the time that
 // client was added; also, for every update to the SharedInformer's
 // local cache after that client was added, eventually either the
 // SharedInformer is stopped or that client is notified of that
@@ -163,6 +165,21 @@ type SharedInformer interface {
 	// store. The value returned is not synchronized with access to the underlying store and is not
 	// thread-safe.
 	LastSyncResourceVersion() string
+
+	// The WatchErrorHandler is called whenever ListAndWatch drops the
+	// connection with an error. After calling this handler, the informer
+	// will backoff and retry.
+	//
+	// The default implementation looks at the error type and tries to log
+	// the error message at an appropriate level.
+	//
+	// There's only one handler, so if you call this multiple times, last one
+	// wins; calling after the informer has been started returns an error.
+	//
+	// The handler is intended for visibility, not to e.g. pause the consumers.
+	// The handler should return quickly - any expensive processing should be
+	// offloaded.
+	SetWatchErrorHandler(handler WatchErrorHandler) error
 }
 
 // SharedIndexInformer provides add and get Indexers ability based on SharedInformer.
@@ -298,6 +315,9 @@ type sharedIndexInformer struct {
 	// blockDeltas gives a way to stop all event distribution so that a late event handler
 	// can safely join the shared informer.
 	blockDeltas sync.Mutex
+
+	// Called whenever the ListAndWatch drops the connection with an error.
+	watchErrorHandler WatchErrorHandler
 }
 
 // dummyController hides the fact that a SharedInformer is different from a dedicated one
@@ -333,6 +353,18 @@ type deleteNotification struct {
 	oldObj interface{}
 }
 
+func (s *sharedIndexInformer) SetWatchErrorHandler(handler WatchErrorHandler) error {
+	s.startedLock.Lock()
+	defer s.startedLock.Unlock()
+
+	if s.started {
+		return fmt.Errorf("informer has already started")
+	}
+
+	s.watchErrorHandler = handler
+	return nil
+}
+
 func (s *sharedIndexInformer) Run(stopCh <-chan struct{}) {
 	defer utilruntime.HandleCrash()
 
@@ -349,7 +381,8 @@ func (s *sharedIndexInformer) Run(stopCh <-chan struct{}) {
 		RetryOnError:     false,
 		ShouldResync:     s.processor.shouldResync,
 
-		Process: s.HandleDeltas,
+		Process:           s.HandleDeltas,
+		WatchErrorHandler: s.watchErrorHandler,
 	}
 
 	func() {