1 // Copyright 2019 The Operator-SDK Authors
3 // Licensed under the Apache License, Version 2.0 (the "License");
4 // you may not use this file except in compliance with the License.
5 // You may obtain a copy of the License at
7 // http://www.apache.org/licenses/LICENSE-2.0
9 // Unless required by applicable law or agreed to in writing, software
10 // distributed under the License is distributed on an "AS IS" BASIS,
11 // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
12 // See the License for the specific language governing permissions and
13 // limitations under the License.
18 "k8s.io/apimachinery/pkg/api/meta"
19 "k8s.io/apimachinery/pkg/runtime/schema"
20 utilruntime "k8s.io/apimachinery/pkg/util/runtime"
21 "k8s.io/client-go/discovery"
22 "k8s.io/client-go/rest"
23 "k8s.io/client-go/restmapper"
26 type DynamicRESTMapper struct {
27 client discovery.DiscoveryInterface
28 delegate meta.RESTMapper
31 // NewDynamicRESTMapper returns a RESTMapper that dynamically discovers resource
32 // types at runtime. This is in contrast to controller-manager's default RESTMapper, which
33 // only checks resource types at startup, and so can't handle the case of first creating a
34 // CRD and then creating an instance of that CRD.
35 func NewDynamicRESTMapper(cfg *rest.Config) (meta.RESTMapper, error) {
36 client, err := discovery.NewDiscoveryClientForConfig(cfg)
41 drm := &DynamicRESTMapper{client: client}
42 if err := drm.reload(); err != nil {
48 func (drm *DynamicRESTMapper) reload() error {
49 gr, err := restmapper.GetAPIGroupResources(drm.client)
53 drm.delegate = restmapper.NewDiscoveryRESTMapper(gr)
57 // reloadOnError checks if an error indicates that the delegated RESTMapper needs to be
58 // reloaded, and if so, reloads it and returns true.
59 func (drm *DynamicRESTMapper) reloadOnError(err error) bool {
60 if _, matches := err.(*meta.NoKindMatchError); !matches {
65 utilruntime.HandleError(err)
70 func (drm *DynamicRESTMapper) KindFor(resource schema.GroupVersionResource) (schema.GroupVersionKind, error) {
71 gvk, err := drm.delegate.KindFor(resource)
72 if drm.reloadOnError(err) {
73 gvk, err = drm.delegate.KindFor(resource)
78 func (drm *DynamicRESTMapper) KindsFor(resource schema.GroupVersionResource) ([]schema.GroupVersionKind, error) {
79 gvks, err := drm.delegate.KindsFor(resource)
80 if drm.reloadOnError(err) {
81 gvks, err = drm.delegate.KindsFor(resource)
86 func (drm *DynamicRESTMapper) ResourceFor(input schema.GroupVersionResource) (schema.GroupVersionResource, error) {
87 gvr, err := drm.delegate.ResourceFor(input)
88 if drm.reloadOnError(err) {
89 gvr, err = drm.delegate.ResourceFor(input)
94 func (drm *DynamicRESTMapper) ResourcesFor(input schema.GroupVersionResource) ([]schema.GroupVersionResource, error) {
95 gvrs, err := drm.delegate.ResourcesFor(input)
96 if drm.reloadOnError(err) {
97 gvrs, err = drm.delegate.ResourcesFor(input)
102 func (drm *DynamicRESTMapper) RESTMapping(gk schema.GroupKind, versions ...string) (*meta.RESTMapping, error) {
103 m, err := drm.delegate.RESTMapping(gk, versions...)
104 if drm.reloadOnError(err) {
105 m, err = drm.delegate.RESTMapping(gk, versions...)
110 func (drm *DynamicRESTMapper) RESTMappings(gk schema.GroupKind, versions ...string) ([]*meta.RESTMapping, error) {
111 ms, err := drm.delegate.RESTMappings(gk, versions...)
112 if drm.reloadOnError(err) {
113 ms, err = drm.delegate.RESTMappings(gk, versions...)
118 func (drm *DynamicRESTMapper) ResourceSingularizer(resource string) (singular string, err error) {
119 s, err := drm.delegate.ResourceSingularizer(resource)
120 if drm.reloadOnError(err) {
121 s, err = drm.delegate.ResourceSingularizer(resource)