89 lines
2.3 KiB
Go
89 lines
2.3 KiB
Go
/*
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Copyright 2022 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 store
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import (
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"fmt"
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discoveryv1 "k8s.io/api/discovery/v1"
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"k8s.io/client-go/tools/cache"
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)
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type getEpssForServiceFunc = func(key string) ([]*discoveryv1.EndpointSlice, error)
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// EndpointSliceLister makes a Store that lists Endpoints.
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type EndpointSliceLister struct {
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cache.Store
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endpointSliceIndex getEpssForServiceFunc
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}
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// MatchByKey returns the EndpointsSlices of the Service matching key in the local Endpoint Store.
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func (s *EndpointSliceLister) MatchByKey(key string) ([]*discoveryv1.EndpointSlice, error) {
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epss, err := s.endpointSliceIndex(key)
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if err != nil {
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return nil, err
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}
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if len(epss) == 0 {
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return nil, NotExistsError(key)
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}
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return epss, nil
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}
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func epssIndexer() cache.Indexers {
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return cache.Indexers{
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discoveryv1.LabelServiceName: func(obj interface{}) ([]string, error) {
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eps, ok := obj.(*discoveryv1.EndpointSlice)
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if !ok {
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// Skip object as it is not an endpointslice
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return nil, nil
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}
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parentService, ok := eps.Labels[discoveryv1.LabelServiceName]
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if !ok {
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// There is no parent service and thus we cannot match this endpointslice to any service
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// As far as i'm aware, this is only possible if you create epps objects by hand
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return nil, nil
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}
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key := fmt.Sprintf("%s/%s", eps.Namespace, parentService)
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return []string{key}, nil
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},
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}
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}
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func epssForServiceFuncFromIndexer(indexer cache.Indexer) getEppsForServiceFunc {
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return func(key string) ([]*discoveryv1.EndpointSlice, error) {
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objs, err := indexer.ByIndex(discoveryv1.LabelServiceName, key)
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if err != nil {
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return nil, err
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}
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epss := make([]*discoveryv1.EndpointSlice, 0, len(objs))
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for _, obj := range objs {
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eps, ok := obj.(*discoveryv1.EndpointSlice)
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if !ok {
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continue
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}
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epss = append(epss, eps)
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}
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return epss, nil
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}
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}
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