/
typed_informer_factory.go
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/
typed_informer_factory.go
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// Copyright 2023 Google LLC
//
// 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 watch
import (
"context"
"time"
"k8s.io/apimachinery/pkg/api/meta"
"k8s.io/client-go/tools/cache"
"kpt.dev/configsync/pkg/kinds"
"sigs.k8s.io/controller-runtime/pkg/client"
)
// TypedInformerFactory is a factory that constructs new SharedIndexInformers.
type TypedInformerFactory struct {
Client client.WithWatch
ResyncPeriod time.Duration
Indexers cache.Indexers
}
// NewTypedInformerFactory constructs a new TypedInformerFactory
func NewTypedInformerFactory(client client.WithWatch, resyncPeriod time.Duration) *TypedInformerFactory {
return &TypedInformerFactory{
Client: client,
ResyncPeriod: resyncPeriod,
Indexers: cache.Indexers{
// by default, index by namespace
cache.NamespaceIndex: cache.MetaNamespaceIndexFunc,
},
}
}
// NewInformer constructs a new SharedIndexInformer for the specified resource.
func (f *TypedInformerFactory) NewInformer(ctx context.Context, mapping *meta.RESTMapping, namespace string) (cache.SharedIndexInformer, error) {
itemGVK := mapping.GroupVersionKind
scheme := f.Client.Scheme()
exampleObj, err := kinds.NewClientObjectForGVK(itemGVK, scheme)
if err != nil {
return nil, err
}
exampleList, err := kinds.NewTypedListForItemGVK(itemGVK, scheme)
if err != nil {
return nil, err
}
opts := &client.ListOptions{
Namespace: namespace,
}
return cache.NewSharedIndexInformer(
NewTypedListerWatcher(ctx, f.Client, exampleList, opts),
exampleObj,
f.ResyncPeriod,
f.Indexers,
), nil
}