mirror of
https://github.com/alibaba/higress.git
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85 lines
2.9 KiB
Go
85 lines
2.9 KiB
Go
// Copyright Istio Authors
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//
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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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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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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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package util
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import (
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"istio.io/istio/pilot/pkg/util/informermetric"
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"istio.io/istio/pkg/config/schema/kubeclient"
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"istio.io/istio/pkg/kube/informerfactory"
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ktypes "istio.io/istio/pkg/kube/kubetypes"
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"istio.io/istio/pkg/log"
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metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
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"k8s.io/apimachinery/pkg/runtime"
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"k8s.io/apimachinery/pkg/runtime/schema"
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"k8s.io/apimachinery/pkg/watch"
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"k8s.io/client-go/tools/cache"
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)
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func GetInformerFiltered(
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c kubeclient.ClientGetter,
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opts ktypes.InformerOptions,
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g schema.GroupVersionResource,
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exampleObject runtime.Object,
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l func(options metav1.ListOptions) (runtime.Object, error),
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w func(options metav1.ListOptions) (watch.Interface, error),
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) informerfactory.StartableInformer {
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return c.Informers().InformerFor(g, opts, func() cache.SharedIndexInformer {
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inf := cache.NewSharedIndexInformer(
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&cache.ListWatch{
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ListFunc: func(options metav1.ListOptions) (runtime.Object, error) {
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options.FieldSelector = opts.FieldSelector
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options.LabelSelector = opts.LabelSelector
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return l(options)
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},
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WatchFunc: func(options metav1.ListOptions) (watch.Interface, error) {
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options.FieldSelector = opts.FieldSelector
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options.LabelSelector = opts.LabelSelector
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return w(options)
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},
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},
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exampleObject,
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0,
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cache.Indexers{cache.NamespaceIndex: cache.MetaNamespaceIndexFunc},
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)
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setupInformer(opts, inf)
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return inf
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})
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}
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func setupInformer(opts ktypes.InformerOptions, inf cache.SharedIndexInformer) {
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// It is important to set this in the newFunc rather than after InformerFor to avoid
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// https://github.com/kubernetes/kubernetes/issues/117869
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if opts.ObjectTransform != nil {
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_ = inf.SetTransform(opts.ObjectTransform)
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} else {
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_ = inf.SetTransform(stripUnusedFields)
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}
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if err := inf.SetWatchErrorHandler(informermetric.ErrorHandlerForCluster(opts.Cluster)); err != nil {
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log.Debugf("failed to set watch handler, informer may already be started: %v", err)
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}
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}
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// stripUnusedFields is the transform function for shared informers,
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// it removes unused fields from objects before they are stored in the cache to save memory.
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func stripUnusedFields(obj any) (any, error) {
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t, ok := obj.(metav1.ObjectMetaAccessor)
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if !ok {
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// shouldn't happen
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return obj, nil
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}
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// ManagedFields is large and we never use it
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t.GetObjectMeta().SetManagedFields(nil)
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return obj, nil
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}
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