89 lines
3.1 KiB
Go
89 lines
3.1 KiB
Go
/*
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Copyright 2019 The Kubernetes Authors.
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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package util
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import (
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"context"
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"time"
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"github.com/pkg/errors"
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pkgruntime "k8s.io/apimachinery/pkg/runtime"
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runtimeclient "sigs.k8s.io/controller-runtime/pkg/client"
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"k8s.io/apimachinery/pkg/api/meta"
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metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
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"k8s.io/apimachinery/pkg/watch"
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"k8s.io/client-go/rest"
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"k8s.io/client-go/tools/cache"
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"sigs.k8s.io/controller-runtime/pkg/client/apiutil"
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"sigs.k8s.io/kubefed/pkg/client/generic/scheme"
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)
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func NewGenericInformer(config *rest.Config, namespace string, obj runtimeclient.Object, resyncPeriod time.Duration, triggerFunc func(runtimeclient.Object)) (cache.Store, cache.Controller, error) {
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return NewGenericInformerWithEventHandler(config, namespace, obj, resyncPeriod, NewTriggerOnAllChanges(triggerFunc))
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}
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func NewGenericInformerWithEventHandler(config *rest.Config, namespace string, obj runtimeclient.Object, resyncPeriod time.Duration, resourceEventHandlerFuncs *cache.ResourceEventHandlerFuncs) (cache.Store, cache.Controller, error) {
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gvk, err := apiutil.GVKForObject(obj, scheme.Scheme)
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if err != nil {
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return nil, nil, err
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}
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mapper, err := apiutil.NewDiscoveryRESTMapper(config)
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if err != nil {
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return nil, nil, errors.Wrap(err, "Could not create RESTMapper from config")
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}
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mapping, err := mapper.RESTMapping(gvk.GroupKind(), gvk.Version)
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if err != nil {
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return nil, nil, err
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}
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client, err := apiutil.RESTClientForGVK(gvk, false, config, scheme.Codecs)
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if err != nil {
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return nil, nil, err
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}
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listGVK := gvk.GroupVersion().WithKind(gvk.Kind + "List")
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listObj, err := scheme.Scheme.New(listGVK)
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if err != nil {
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return nil, nil, err
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}
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store, controller := cache.NewInformer(
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&cache.ListWatch{
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ListFunc: func(opts metav1.ListOptions) (pkgruntime.Object, error) {
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res := listObj.DeepCopyObject()
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isNamespaceScoped := namespace != "" && mapping.Scope.Name() != meta.RESTScopeNameRoot
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err := client.Get().NamespaceIfScoped(namespace, isNamespaceScoped).Resource(mapping.Resource.Resource).VersionedParams(&opts, scheme.ParameterCodec).Do(context.Background()).Into(res)
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return res, err
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},
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WatchFunc: func(opts metav1.ListOptions) (watch.Interface, error) {
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// Watch needs to be set to true separately
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opts.Watch = true
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isNamespaceScoped := namespace != "" && mapping.Scope.Name() != meta.RESTScopeNameRoot
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return client.Get().NamespaceIfScoped(namespace, isNamespaceScoped).Resource(mapping.Resource.Resource).VersionedParams(&opts, scheme.ParameterCodec).Watch(context.Background())
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},
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},
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obj,
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resyncPeriod,
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resourceEventHandlerFuncs,
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)
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return store, controller, nil
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}
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