func()

in pkg/virtualnode/membership_designator.go [36:67]

• 29 lines of code
• 8 McCabe index (conditional complexity)

func (d *membershipDesignator) Designate(ctx context.Context, pod *corev1.Pod) (*appmesh.VirtualNode, error) {

	// see https://github.com/kubernetes/kubernetes/issues/88282 and https://github.com/kubernetes/kubernetes/issues/76680
	req := webhook.ContextGetAdmissionRequest(ctx)
	vnList := appmesh.VirtualNodeList{}
	if err := d.k8sClient.List(ctx, &vnList, client.InNamespace(req.Namespace)); err != nil {
		return nil, errors.Wrap(err, "failed to list VirtualNodes in cluster")
	}

	var vnCandidates []*appmesh.VirtualNode
	for _, vnObj := range vnList.Items {
		selector, err := metav1.LabelSelectorAsSelector(vnObj.Spec.PodSelector)
		if err != nil {
			return nil, err
		}
		if selector.Matches(labels.Set(pod.Labels)) {
			vnCandidates = append(vnCandidates, vnObj.DeepCopy())
		}
	}
	if len(vnCandidates) == 0 {
		return nil, nil
	}
	if len(vnCandidates) > 1 {
		var vnCandidatesNames []string
		for _, vn := range vnCandidates {
			vnCandidatesNames = append(vnCandidatesNames, k8s.NamespacedName(vn).String())
		}
		return nil, errors.Errorf("found multiple matching VirtualNodes for pod %s: %s",
			k8s.NamespacedName(pod).String(), strings.Join(vnCandidatesNames, ","))
	}
	return vnCandidates[0], nil
}