add fakes for events package, add startEventWatcher to event interface

Signed-off-by: Yassine TIJANI <ytijani@vmware.com>

Kubernetes-commit: bfa7de0165c911178daaac1991c08f7424b0048f

kubernetes/typed/events/v1beta1/fake/fake_event_expansion.go

@@ -1,5 +1,5 @@
 /*
-Copyright 2014 The Kubernetes Authors.
+Copyright 2019 The Kubernetes Authors.
 
 Licensed under the Apache License, Version 2.0 (the "License");
 you may not use this file except in compliance with the License.

tools/events/event_broadcaster.go

@@ -271,9 +271,9 @@ func getKey(event *v1beta1.Event) eventKey {
 	return key
 }
 
-// startEventWatcher starts sending events received from this EventBroadcaster to the given event handler function.
+// StartEventWatcher starts sending events received from this EventBroadcaster to the given event handler function.
 // The return value is used to stop recording
-func (e *eventBroadcasterImpl) startEventWatcher(eventHandler func(event runtime.Object)) func() {
+func (e *eventBroadcasterImpl) StartEventWatcher(eventHandler func(event runtime.Object)) func() {
 	watcher := e.Watch()
 	go func() {
 		defer utilruntime.HandleCrash()
@@ -304,7 +304,7 @@ func (e *eventBroadcasterImpl) StartRecordingToSink(stopCh <-chan struct{}) {
 		}
 		e.recordToSink(event, clock.RealClock{})
 	}
-	stopWatcher := e.startEventWatcher(eventHandler)
+	stopWatcher := e.StartEventWatcher(eventHandler)
 	go func() {
 		<-stopCh
 		stopWatcher()

tools/events/fake.go

@@ -0,0 +1,45 @@
+/*
+Copyright 2019 The Kubernetes Authors.
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+package events
+
+import (
+	"fmt"
+
+	"k8s.io/apimachinery/pkg/runtime"
+)
+
+// FakeRecorder is used as a fake during tests. It is thread safe. It is usable
+// when created manually and not by NewFakeRecorder, however all events may be
+// thrown away in this case.
+type FakeRecorder struct {
+	Events chan string
+}
+
+// Eventf emits an event
+func (f *FakeRecorder) Eventf(regarding runtime.Object, related runtime.Object, eventtype, reason, action, note string, args ...interface{}) {
+	if f.Events != nil {
+		f.Events <- fmt.Sprintf(eventtype+" "+reason+" "+note, args...)
+	}
+}
+
+// NewFakeRecorder creates new fake event recorder with event channel with
+// buffer of given size.
+func NewFakeRecorder(bufferSize int) *FakeRecorder {
+	return &FakeRecorder{
+		Events: make(chan string, bufferSize),
+	}
+}

tools/events/interfaces.go

@@ -45,6 +45,12 @@ type EventBroadcaster interface {
 	// NewRecorder returns an EventRecorder that can be used to send events to this EventBroadcaster
 	// with the event source set to the given event source.
 	NewRecorder(scheme *runtime.Scheme, reportingController string) EventRecorder
+
+	// StartEventWatcher enables you to watch for emitted events without usage
+	// of StartRecordingToSink. This lets you also process events in a custom way (e.g. in tests).
+	// NOTE: events received on your eventHandler should be copied before being used.
+	// TODO: figure out if this can be removed.
+	StartEventWatcher(eventHandler func(event runtime.Object)) func()
 }
 
 // EventSink knows how to store events (client-go implements it.)