From 565aa5b9f00690ef8e405d8a6e7f4d6b4204ca5e Mon Sep 17 00:00:00 2001 From: Guillermo Gaston Date: Wed, 14 Feb 2024 18:40:16 +0000 Subject: [PATCH] Fix lazy rest mapper cache invalidation When a group version is not found, if the group version is cached in apiGroups but not cached in knownGroups, the cache is not invalidated. Moreover and even worse, in that scenario an error is returned. --- pkg/client/apiutil/restmapper.go | 28 +++- pkg/client/apiutil/restmapper_wb_test.go | 203 +++++++++++++++++++++++ 2 files changed, 227 insertions(+), 4 deletions(-) create mode 100644 pkg/client/apiutil/restmapper_wb_test.go diff --git a/pkg/client/apiutil/restmapper.go b/pkg/client/apiutil/restmapper.go index 24af330c8b..927be22b4e 100644 --- a/pkg/client/apiutil/restmapper.go +++ b/pkg/client/apiutil/restmapper.go @@ -53,7 +53,7 @@ func NewDynamicRESTMapper(cfg *rest.Config, httpClient *http.Client) (meta.RESTM // client for discovery information to do REST mappings. type mapper struct { mapper meta.RESTMapper - client *discovery.DiscoveryClient + client discovery.DiscoveryInterface knownGroups map[string]*restmapper.APIGroupResources apiGroups map[string]*metav1.APIGroup @@ -280,11 +280,15 @@ func (m *mapper) fetchGroupVersionResourcesLocked(groupName string, versions ... groupVersion := schema.GroupVersion{Group: groupName, Version: version} apiResourceList, err := m.client.ServerResourcesForGroupVersion(groupVersion.String()) - if apierrors.IsNotFound(err) && m.isGroupVersionCached(groupVersion) { + if apierrors.IsNotFound(err) { // If the version is not found, we remove the group from the cache // so it gets refreshed on the next call. - delete(m.apiGroups, groupName) - delete(m.knownGroups, groupName) + if m.isAPIGroupCached(groupVersion) { + delete(m.apiGroups, groupName) + } + if m.isGroupVersionCached(groupVersion) { + delete(m.knownGroups, groupName) + } continue } else if err != nil { failedGroups[groupVersion] = err @@ -313,3 +317,19 @@ func (m *mapper) isGroupVersionCached(gv schema.GroupVersion) bool { return false } + +// isAPIGroupCached checks if a version for a group is cached in the api groups cache. +func (m *mapper) isAPIGroupCached(gv schema.GroupVersion) bool { + cachedGroup, ok := m.apiGroups[gv.Group] + if !ok { + return false + } + + for _, version := range cachedGroup.Versions { + if version.Version == gv.Version { + return true + } + } + + return false +} diff --git a/pkg/client/apiutil/restmapper_wb_test.go b/pkg/client/apiutil/restmapper_wb_test.go new file mode 100644 index 0000000000..96dbe79e77 --- /dev/null +++ b/pkg/client/apiutil/restmapper_wb_test.go @@ -0,0 +1,203 @@ +/* +Copyright 2024 The Kubernetes 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 apiutil + +import ( + "testing" + + gmg "github.com/onsi/gomega" + metav1 "k8s.io/apimachinery/pkg/apis/meta/v1" + "k8s.io/client-go/kubernetes/fake" + "k8s.io/client-go/restmapper" +) + +func TestLazyRestMapper_fetchGroupVersionResourcesLocked_CacheInvalidation(t *testing.T) { + tests := []struct { + name string + groupName string + versions []string + cachedAPIGroups, expectedAPIGroups map[string]*metav1.APIGroup + cachedKnownGroups, expectedKnownGroups map[string]*restmapper.APIGroupResources + }{ + { + name: "Not found version for cached groupVersion in apiGroups and knownGroups", + groupName: "group1", + versions: []string{"v1", "v2"}, + cachedAPIGroups: map[string]*metav1.APIGroup{ + "group1": { + Name: "group1", + Versions: []metav1.GroupVersionForDiscovery{ + { + Version: "v1", + }, + }, + }, + }, + cachedKnownGroups: map[string]*restmapper.APIGroupResources{ + "group1": { + VersionedResources: map[string][]metav1.APIResource{ + "v1": { + { + Name: "resource1", + }, + }, + }, + }, + }, + expectedAPIGroups: map[string]*metav1.APIGroup{}, + expectedKnownGroups: map[string]*restmapper.APIGroupResources{}, + }, + { + name: "Not found version for cached groupVersion only in apiGroups", + groupName: "group1", + versions: []string{"v1", "v2"}, + cachedAPIGroups: map[string]*metav1.APIGroup{ + "group1": { + Name: "group1", + Versions: []metav1.GroupVersionForDiscovery{ + { + Version: "v1", + }, + }, + }, + }, + cachedKnownGroups: map[string]*restmapper.APIGroupResources{ + "group1": { + VersionedResources: map[string][]metav1.APIResource{ + "v3": { + { + Name: "resource1", + }, + }, + }, + }, + }, + expectedAPIGroups: map[string]*metav1.APIGroup{}, + expectedKnownGroups: map[string]*restmapper.APIGroupResources{ + "group1": { + VersionedResources: map[string][]metav1.APIResource{ + "v3": { + { + Name: "resource1", + }, + }, + }, + }, + }, + }, + { + name: "Not found version for cached groupVersion only in knownGroups", + groupName: "group1", + versions: []string{"v1", "v2"}, + cachedAPIGroups: map[string]*metav1.APIGroup{ + "group1": { + Name: "group1", + Versions: []metav1.GroupVersionForDiscovery{ + { + Version: "v3", + }, + }, + }, + }, + cachedKnownGroups: map[string]*restmapper.APIGroupResources{ + "group1": { + VersionedResources: map[string][]metav1.APIResource{ + "v2": { + { + Name: "resource1", + }, + }, + }, + }, + }, + expectedAPIGroups: map[string]*metav1.APIGroup{ + "group1": { + Name: "group1", + Versions: []metav1.GroupVersionForDiscovery{ + { + Version: "v3", + }, + }, + }, + }, + expectedKnownGroups: map[string]*restmapper.APIGroupResources{}, + }, + { + name: "Not found version for non cached groupVersion", + groupName: "group1", + versions: []string{"v1", "v2"}, + cachedAPIGroups: map[string]*metav1.APIGroup{ + "group1": { + Name: "group1", + Versions: []metav1.GroupVersionForDiscovery{ + { + Version: "v3", + }, + }, + }, + }, + cachedKnownGroups: map[string]*restmapper.APIGroupResources{ + "group1": { + VersionedResources: map[string][]metav1.APIResource{ + "v3": { + { + Name: "resource1", + }, + }, + }, + }, + }, + expectedAPIGroups: map[string]*metav1.APIGroup{ + "group1": { + Name: "group1", + Versions: []metav1.GroupVersionForDiscovery{ + { + Version: "v3", + }, + }, + }, + }, + expectedKnownGroups: map[string]*restmapper.APIGroupResources{ + "group1": { + VersionedResources: map[string][]metav1.APIResource{ + "v3": { + { + Name: "resource1", + }, + }, + }, + }, + }, + }, + } + + for _, tt := range tests { + t.Run(tt.name, func(t *testing.T) { + g := gmg.NewWithT(t) + m := &mapper{ + mapper: restmapper.NewDiscoveryRESTMapper([]*restmapper.APIGroupResources{}), + client: fake.NewSimpleClientset().Discovery(), + apiGroups: tt.cachedAPIGroups, + knownGroups: tt.cachedKnownGroups, + } + _, err := m.fetchGroupVersionResourcesLocked(tt.groupName, tt.versions...) + g.Expect(err).NotTo(gmg.HaveOccurred()) + g.Expect(m.apiGroups).To(gmg.BeComparableTo(tt.expectedAPIGroups)) + g.Expect(m.knownGroups).To(gmg.BeComparableTo(tt.expectedKnownGroups)) + }) + } +}