Checking for type assertion success (kedacore#181)

Fixes kedacore#174

Signed-off-by: Aaron Schlesinger <aaron@ecomaz.net>

Co-authored-by: Tom Kerkhove <kerkhove.tom@gmail.com>

interceptor/forward_wait_func.go

@@ -37,13 +37,9 @@ func newDeployReplicasForwardWaitFunc(
 		for {
 			select {
 			case event := <-eventCh:
-				deployment := event.Object.(*appsv1.Deployment)
-				if err != nil {
-					log.Printf(
-						"Error getting deployment %s after change was triggered (%s)",
-						deployName,
-						err,
-					)
+				deployment, ok := event.Object.(*appsv1.Deployment)
+				if !ok {
+					log.Println("Didn't get a deployment back in event")
 				}
 				if moreThanPtr(deployment.Spec.Replicas, 0) {
 					return nil

pkg/k8s/deployment_cache.go

@@ -57,7 +57,12 @@ func NewK8sDeploymentCache(
 			evt := <-ch
 			ret.broadcaster.Action(evt.Type, evt.Object)
 			ret.rwm.Lock()
-			depl := evt.Object.(*appsv1.Deployment)
+			depl, ok := evt.Object.(*appsv1.Deployment)
+			// if we didn't get back a deployment in the event,
+			// something is wrong that we can't fix, so just continue
+			if !ok {
+				continue
+			}
 			ret.latestEvts[depl.GetObjectMeta().GetName()] = evt
 			ret.rwm.Unlock()
 		}