feat(scheduler): use context in the scheduler package

+ Use context instead of stopCh
+ Add context to the scheduling framework interface

test/integration/util/util.go

@@ -17,6 +17,7 @@ limitations under the License.
 package util
 
 import (
+	"context"
 	"net/http"
 	"net/http/httptest"
 
@@ -59,30 +60,31 @@ func StartApiserver() (string, ShutdownFunc) {
 // StartScheduler configures and starts a scheduler given a handle to the clientSet interface
 // and event broadcaster. It returns the running scheduler and the shutdown function to stop it.
 func StartScheduler(clientSet clientset.Interface) (*scheduler.Scheduler, coreinformers.PodInformer, ShutdownFunc) {
+	ctx, cancel := context.WithCancel(context.Background())
+
 	informerFactory := informers.NewSharedInformerFactory(clientSet, 0)
 	podInformer := informerFactory.Core().V1().Pods()
-	stopCh := make(chan struct{})
 	evtBroadcaster := events.NewBroadcaster(&events.EventSinkImpl{
 		Interface: clientSet.EventsV1beta1().Events("")})
 
-	evtBroadcaster.StartRecordingToSink(stopCh)
+	evtBroadcaster.StartRecordingToSink(ctx.Done())
 
 	recorder := evtBroadcaster.NewRecorder(
 		legacyscheme.Scheme,
 		v1.DefaultSchedulerName,
 	)
 
-	sched, err := createScheduler(clientSet, informerFactory, podInformer, recorder, stopCh)
+	sched, err := createScheduler(clientSet, informerFactory, podInformer, recorder, ctx.Done())
 	if err != nil {
 		klog.Fatalf("Error creating scheduler: %v", err)
 	}
 
-	informerFactory.Start(stopCh)
-	sched.Run()
+	informerFactory.Start(ctx.Done())
+	go sched.Run(ctx)
 
 	shutdownFunc := func() {
 		klog.Infof("destroying scheduler")
-		close(stopCh)
+		cancel()
 		klog.Infof("destroyed scheduler")
 	}
 	return sched, podInformer, shutdownFunc