switch to using the real FIFO

Kubernetes-commit: a9aab298b4738f4ea9111131cdf193a3b1ba14e5

tools/cache/controller.go

@@ -19,6 +19,7 @@ package cache
 import (
 	"context"
 	"errors"
+	clientgofeaturegate "k8s.io/client-go/features"
 	"sync"
 	"time"
 
@@ -592,11 +593,17 @@ func newInformer(clientState Store, options InformerOptions) Controller {
 	// This will hold incoming changes. Note how we pass clientState in as a
 	// KeyLister, that way resync operations will result in the correct set
 	// of update/delete deltas.
-	fifo := NewDeltaFIFOWithOptions(DeltaFIFOOptions{
-		KnownObjects:          clientState,
-		EmitDeltaTypeReplaced: true,
-		Transformer:           options.Transform,
-	})
+
+	var fifo Queue
+	if clientgofeaturegate.FeatureGates().Enabled(clientgofeaturegate.InOrderInformers) {
+		fifo = NewRealFIFO(MetaNamespaceKeyFunc, clientState, options.Transform)
+	} else {
+		fifo = NewDeltaFIFOWithOptions(DeltaFIFOOptions{
+			KnownObjects:          clientState,
+			EmitDeltaTypeReplaced: true,
+			Transformer:           options.Transform,
+		})
+	}
 
 	cfg := &Config{
 		Queue:            fifo,

tools/cache/controller_test.go

@@ -49,10 +49,7 @@ func Example() {
 	// This will hold incoming changes. Note how we pass downstream in as a
 	// KeyLister, that way resync operations will result in the correct set
 	// of update/delete deltas.
-	fifo := NewDeltaFIFOWithOptions(DeltaFIFOOptions{
-		KeyFunction:  MetaNamespaceKeyFunc,
-		KnownObjects: downstream,
-	})
+	fifo := NewRealFIFO(MetaNamespaceKeyFunc, downstream, nil)
 
 	// Let's do threadsafe output to get predictable test results.
 	deletionCounter := make(chan string, 1000)
@@ -87,7 +84,7 @@ func Example() {
 
 				// fifo's KeyOf is easiest, because it handles
 				// DeletedFinalStateUnknown markers.
-				key, err := fifo.KeyOf(newest.Object)
+				key, err := fifo.keyOf(newest.Object)
 				if err != nil {
 					return err
 				}

tools/cache/shared_informer.go

@@ -540,11 +540,16 @@ func (s *sharedIndexInformer) RunWithContext(ctx context.Context) {
 		s.startedLock.Lock()
 		defer s.startedLock.Unlock()
 
-		fifo := NewDeltaFIFOWithOptions(DeltaFIFOOptions{
-			KnownObjects:          s.indexer,
-			EmitDeltaTypeReplaced: true,
-			Transformer:           s.transform,
-		})
+		var fifo Queue
+		if clientgofeaturegate.FeatureGates().Enabled(clientgofeaturegate.InOrderInformers) {
+			fifo = NewRealFIFO(MetaNamespaceKeyFunc, s.indexer, s.transform)
+		} else {
+			fifo = NewDeltaFIFOWithOptions(DeltaFIFOOptions{
+				KnownObjects:          s.indexer,
+				EmitDeltaTypeReplaced: true,
+				Transformer:           s.transform,
+			})
+		}
 
 		cfg := &Config{
 			Queue:             fifo,