Fixes on node and control plane config controllers (#333)

* fix error message when we cannot retrieve the cluster configuration

* fail if result is not a configmap

Author: neoaggelos

src/k8s/pkg/k8sd/controllers/control_plane_configuration.go

@@ -55,7 +55,7 @@ func (c *ControlPlaneConfigurationController) Run(ctx context.Context, getCluste
 
 		config, err := getClusterConfig(ctx)
 		if err != nil {
-			log.Println(fmt.Errorf("failed to reconcile control plane configuration: %w", err))
+			log.Println(fmt.Errorf("failed to retrieve cluster config: %w", err))
 			continue
 		}
 

src/k8s/pkg/utils/k8s/configmap.go

@@ -22,7 +22,10 @@ func (c *Client) WatchConfigMap(ctx context.Context, namespace string, name stri
 			return nil
 		case evt := <-w.ResultChan():
 			if evt.Object != nil {
-				configMap := evt.Object.(*v1.ConfigMap)
+				configMap, ok := evt.Object.(*v1.ConfigMap)
+				if !ok {
+					return fmt.Errorf("expected a ConfigMap but received %#v", evt.Object)
+				}
 
 				if err := reconcile(configMap); err != nil {
 					log.Println(fmt.Errorf("failed to reconcile configmap, namespace: %s name: %s: %w", namespace, name, err))