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filter.go
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filter.go
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// Copyright Project Contour 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 k8s
import (
metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
"k8s.io/client-go/tools/cache"
)
type namespaceFilter struct {
next cache.ResourceEventHandler
index map[string]struct{}
}
// NewNamespaceFilter returns a cache.ResourceEventHandler that accepts
// only objects whose namespaces are included in the given slice of
// namespaces. Objects with matching namespaces are passed to the next
// handler.
func NewNamespaceFilter(
namespaces []string,
next cache.ResourceEventHandler,
) cache.ResourceEventHandler {
e := &namespaceFilter{
next: next,
index: make(map[string]struct{}),
}
for _, ns := range namespaces {
e.index[ns] = struct{}{}
}
return e
}
func (e *namespaceFilter) allowed(obj interface{}) bool {
if obj, ok := obj.(metav1.Object); ok {
_, ok := e.index[obj.GetNamespace()]
return ok
}
return true
}
func (e *namespaceFilter) OnAdd(obj interface{}) {
if e.allowed(obj) {
e.next.OnAdd(obj)
}
}
func (e *namespaceFilter) OnUpdate(oldObj, newObj interface{}) {
if e.allowed(oldObj) {
e.next.OnUpdate(oldObj, newObj)
}
}
func (e *namespaceFilter) OnDelete(obj interface{}) {
if e.allowed(obj) {
e.next.OnDelete(obj)
}
}