source/ingress.go
func (sc *ingressSource) filterByAnnotations(ingresses []*v1beta1.Ingress) ([]*v1beta1.Ingress, error) {
	labelSelector, err := metav1.ParseToLabelSelector(sc.annotationFilter)
	if err != nil {
		return nil, err
	}
	selector, err := metav1.LabelSelectorAsSelector(labelSelector)
	if err != nil {
		return nil, err
	}

	// empty filter returns original list
	if selector.Empty() {
		return ingresses, nil
	}

	filteredList := []*v1beta1.Ingress{}

	for _, ingress := range ingresses {
		// convert the ingress' annotations to an equivalent label selector
		annotations := labels.Set(ingress.Annotations)

		// include ingress if its annotations match the selector
		if selector.Matches(annotations) {
			filteredList = append(filteredList, ingress)
		}
	}

	return filteredList, nil
}
func (sc *ingressSource) filterByAnnotations(ingresses []*v1beta1.Ingress) ([]*v1beta1.Ingress, error) {
	labelSelector, err := metav1.ParseToLabelSelector(sc.annotationFilter)
	if err != nil {
		return nil, err
	}
	selector, err := metav1.LabelSelectorAsSelector(labelSelector)
	if err != nil {
		return nil, err
	}

	// empty filter returns original list
	if selector.Empty() {
		return ingresses, nil
	}

	filteredList := []*v1beta1.Ingress{}

	for _, ingress := range ingresses {
		// convert the ingress' annotations to an equivalent label selector
		annotations := labels.Set(ingress.Annotations)

		// include ingress if its annotations match the selector
		if selector.Matches(annotations) {
			filteredList = append(filteredList, ingress)
		}
	}

	return filteredList, nil
}
// filterByAnnotations filters a list of ingresses by a given annotation selector.