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predicate.go
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predicate.go
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// Copyright 2018 The Operator-SDK Authors
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package predicate
import (
metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
"k8s.io/apimachinery/pkg/labels"
"sigs.k8s.io/controller-runtime/pkg/event"
"sigs.k8s.io/controller-runtime/pkg/predicate"
)
type resourceFilterPredicate struct {
predicate.Funcs
Selector labels.Selector
}
// Skips events that have labels matching selectors defined in watches.yaml
func (r resourceFilterPredicate) eventFilter(eventLabels map[string]string) bool {
return r.Selector.Matches(labels.Set(eventLabels))
}
func NewResourceFilterPredicate(s metav1.LabelSelector) (predicate.Predicate, error) {
selectorSpecs, err := metav1.LabelSelectorAsSelector(&s)
requirements := resourceFilterPredicate{Selector: selectorSpecs}
return requirements, err
}
// Predicate functions that call the EventFilter Function
func (r resourceFilterPredicate) Update(e event.UpdateEvent) bool {
return r.eventFilter(e.ObjectNew.GetLabels())
}
func (r resourceFilterPredicate) Create(e event.CreateEvent) bool {
return r.eventFilter(e.Object.GetLabels())
}
func (r resourceFilterPredicate) Delete(e event.DeleteEvent) bool {
return r.eventFilter(e.Object.GetLabels())
}
func (r resourceFilterPredicate) Generic(e event.GenericEvent) bool {
return r.eventFilter(e.Object.GetLabels())
}