func()

in pkg/virtualgateway/membership_designator.go [75:121]

• 37 lines of code
• 11 McCabe index (conditional complexity)

func (d *membershipDesignator) DesignateForGatewayRoute(ctx context.Context, obj *appmesh.GatewayRoute) (*appmesh.VirtualGateway, error) {

	// see https://github.com/kubernetes/kubernetes/issues/88282 and https://github.com/kubernetes/kubernetes/issues/76680
	req := webhook.ContextGetAdmissionRequest(ctx)
	objNS := corev1.Namespace{}
	if err := d.k8sClient.Get(ctx, types.NamespacedName{Name: req.Namespace}, &objNS); err != nil {
		return nil, errors.Wrapf(err, "failed to get namespace: %s", obj.GetNamespace())
	}
	vgList := appmesh.VirtualGatewayList{}
	if err := d.k8sClient.List(ctx, &vgList); err != nil {
		return nil, errors.Wrap(err, "failed to list virtualGateways in cluster")
	}

	var vgCandidates []*appmesh.VirtualGateway

	for _, vgObj := range vgList.Items {
		if matches, err := matchesNamespaceSelector(objNS, &vgObj); err != nil {
			return nil, err
		} else if !matches {
			continue
		}

		if matches, err := matchesGatewayRouteSelector(obj, &vgObj); err != nil {
			return nil, err
		} else if !matches {
			continue
		}
		vgCandidates = append(vgCandidates, vgObj.DeepCopy())
	}

	// No matching VirtualGateway
	if len(vgCandidates) == 0 {
		return nil, errors.Errorf("failed to find matching virtualGateway for gatewayRoute: %s, expecting 1 but found 0", obj.GetName())
	}

	// Multiple matching VirtualGateway
	if len(vgCandidates) > 1 {
		var vgCandidatesNames []string
		for _, vg := range vgCandidates {
			vgCandidatesNames = append(vgCandidatesNames, vg.Name)
		}
		return nil, errors.Errorf("found multiple matching virtualGateways for gatewayRoute: %s, expecting 1 but found %d: %s",
			obj.GetName(), len(vgCandidates), strings.Join(vgCandidatesNames, ","))
	}

	return vgCandidates[0], nil
}