Move fallback of Event API into new event lib

Kubernetes-commit: e0e12f25c9ccd33f5578fddef79d93eb7b62ea0c

tools/events/interfaces.go

@@ -19,6 +19,7 @@ package events
 import (
 	"k8s.io/api/events/v1beta1"
 	"k8s.io/apimachinery/pkg/runtime"
+	"k8s.io/client-go/tools/record"
 )
 
 // EventRecorder knows how to record events on behalf of an EventSource.
@@ -68,3 +69,22 @@ type EventSink interface {
 	Update(event *v1beta1.Event) (*v1beta1.Event, error)
 	Patch(oldEvent *v1beta1.Event, data []byte) (*v1beta1.Event, error)
 }
+
+// EventBroadcasterAdapter is a auxiliary interface to simplify migration to
+// the new events API. It is a wrapper around new and legacy broadcasters
+// that smartly chooses which one to use.
+//
+// Deprecated: This interface will be removed once migration is completed.
+type EventBroadcasterAdapter interface {
+	// StartRecordingToSink starts sending events received from the specified eventBroadcaster.
+	StartRecordingToSink(stopCh <-chan struct{})
+
+	// NewRecorder creates a new Event Recorder with specified name.
+	NewRecorder(name string) EventRecorder
+
+	// DeprecatedNewLegacyRecorder creates a legacy Event Recorder with specific name.
+	DeprecatedNewLegacyRecorder(name string) record.EventRecorder
+
+	// Shutdown shuts down the broadcaster.
+	Shutdown()
+}