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restmapper.go
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restmapper.go
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/*
Copyright AppsCode Inc. and Contributors
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 discovery
import (
"fmt"
"strings"
"sync"
kmapi "kmodules.xyz/client-go/api/v1"
"k8s.io/apimachinery/pkg/api/meta"
metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
"k8s.io/apimachinery/pkg/runtime/schema"
"k8s.io/client-go/discovery"
"k8s.io/client-go/discovery/cached/memory"
"k8s.io/client-go/rest"
"k8s.io/client-go/restmapper"
"k8s.io/klog/v2"
"sigs.k8s.io/controller-runtime/pkg/client/apiutil"
)
func APIResourceForGVK(client discovery.DiscoveryInterface, gvk schema.GroupVersionKind) (metav1.APIResource, error) {
resourceList, err := client.ServerResourcesForGroupVersion(gvk.GroupVersion().String())
if discovery.IsGroupDiscoveryFailedError(err) {
klog.Errorf("Skipping failed API Groups: %v", err)
} else if err != nil {
return metav1.APIResource{}, err
}
var resources []metav1.APIResource
for _, resource := range resourceList.APIResources {
if resource.Kind == gvk.Kind { // match kind
resource.Group = gvk.Group
resource.Version = gvk.Version
resources = append(resources, resource)
}
}
resources = FilterAPISubResources(resources) // ignore sub-resources
switch len(resources) {
case 0:
return metav1.APIResource{}, fmt.Errorf("APIResource not found for gvk=%v", gvk)
case 1:
return resources[0], nil
default:
var matches []schema.GroupVersionResource
for _, resource := range resources {
matches = append(matches, schema.GroupVersionResource{
Group: resource.Group,
Version: resource.Version,
Resource: resource.Name,
})
}
return metav1.APIResource{}, &meta.AmbiguousResourceError{PartialResource: matches[0], MatchingResources: matches}
}
}
func ResourceForGVK(client discovery.DiscoveryInterface, gvk schema.GroupVersionKind) (schema.GroupVersionResource, error) {
return NewResourceMapper(NewRestMapper(client)).GVR(gvk)
}
func FilterAPISubResources(resources []metav1.APIResource) []metav1.APIResource {
var filtered []metav1.APIResource
for _, res := range resources {
if !strings.ContainsRune(res.Name, '/') {
filtered = append(filtered, res)
}
}
return filtered
}
func FilterSubResources(gvrs []schema.GroupVersionResource) []schema.GroupVersionResource {
var filtered []schema.GroupVersionResource
for _, res := range gvrs {
if !strings.ContainsRune(res.Resource, '/') {
filtered = append(filtered, res)
}
}
return filtered
}
func NewRestMapper(client discovery.DiscoveryInterface) meta.RESTMapper {
return restmapper.NewDeferredDiscoveryRESTMapper(memory.NewMemCacheClient(client))
}
type ResourceMapper interface {
ResourceIDForGVK(gvk schema.GroupVersionKind) (*kmapi.ResourceID, error)
ResourceIDForGVR(gvr schema.GroupVersionResource) (*kmapi.ResourceID, error)
GVR(gvk schema.GroupVersionKind) (schema.GroupVersionResource, error)
TypeMeta(gvr schema.GroupVersionResource) (metav1.TypeMeta, error)
GVK(gvr schema.GroupVersionResource) (schema.GroupVersionKind, error)
IsGVRNamespaced(gvr schema.GroupVersionResource) (bool, error)
IsGVKNamespaced(gvk schema.GroupVersionKind) (bool, error)
IsPreferred(gvr schema.GroupVersionResource) (bool, error)
Preferred(gvr schema.GroupVersionResource) (schema.GroupVersionResource, error)
ExistsGVR(gvr schema.GroupVersionResource) (bool, error)
ExistsGVK(gvk schema.GroupVersionKind) (bool, error)
Reset()
}
type resourcemapper struct {
mapper meta.RESTMapper
// Keeping this cache unbounded, since the # of unique GVKs will be at most few thousands
cache map[schema.GroupVersionKind]*kmapi.ResourceID
lock sync.RWMutex
}
var _ ResourceMapper = &resourcemapper{}
func NewResourceMapper(mapper meta.RESTMapper) ResourceMapper {
return &resourcemapper{mapper: mapper, cache: map[schema.GroupVersionKind]*kmapi.ResourceID{}}
}
func NewDynamicResourceMapper(cfg *rest.Config, opts ...apiutil.DynamicRESTMapperOption) (ResourceMapper, error) {
mapper, err := apiutil.NewDynamicRESTMapper(cfg, opts...)
if err != nil {
return nil, err
}
return &resourcemapper{mapper: mapper, cache: map[schema.GroupVersionKind]*kmapi.ResourceID{}}, nil
}
func (m *resourcemapper) ResourceIDForGVK(gvk schema.GroupVersionKind) (*kmapi.ResourceID, error) {
m.lock.RLock()
rid, ok := m.cache[gvk]
m.lock.RUnlock()
if ok {
return rid, nil
}
mapping, err := m.mapper.RESTMapping(gvk.GroupKind(), gvk.Version)
if err != nil {
return nil, err
}
rid = kmapi.NewResourceID(mapping)
m.lock.Lock()
m.cache[gvk] = rid
m.lock.Unlock()
return rid, nil
}
func (m *resourcemapper) ResourceIDForGVR(gvr schema.GroupVersionResource) (*kmapi.ResourceID, error) {
gvk, err := m.mapper.KindFor(gvr)
if err != nil {
return nil, err
}
m.lock.RLock()
rid, ok := m.cache[gvk]
m.lock.RUnlock()
if ok {
return rid, nil
}
mapping, err := m.mapper.RESTMapping(gvk.GroupKind(), gvk.Version)
if err != nil {
return nil, err
}
rid = kmapi.NewResourceID(mapping)
m.lock.Lock()
m.cache[gvk] = rid
m.lock.Unlock()
return rid, nil
}
func (m *resourcemapper) GVR(gvk schema.GroupVersionKind) (schema.GroupVersionResource, error) {
mapping, err := m.mapper.RESTMapping(gvk.GroupKind(), gvk.Version)
if err != nil {
return schema.GroupVersionResource{}, err
}
return mapping.Resource, nil
}
func (m *resourcemapper) TypeMeta(gvr schema.GroupVersionResource) (metav1.TypeMeta, error) {
gvk, err := m.mapper.KindFor(gvr)
if err != nil {
return metav1.TypeMeta{}, err
}
return metav1.TypeMeta{
APIVersion: gvr.GroupVersion().String(),
Kind: gvk.Kind,
}, nil
}
func (m *resourcemapper) GVK(gvr schema.GroupVersionResource) (schema.GroupVersionKind, error) {
gvk, err := m.mapper.KindFor(gvr)
if err != nil {
return schema.GroupVersionKind{}, err
}
return gvk, nil
}
func (m *resourcemapper) IsGVRNamespaced(gvr schema.GroupVersionResource) (bool, error) {
gvk, err := m.mapper.KindFor(gvr)
if err != nil {
return false, err
}
return m.IsGVKNamespaced(gvk)
}
func (m *resourcemapper) IsGVKNamespaced(gvk schema.GroupVersionKind) (bool, error) {
mapping, err := m.mapper.RESTMapping(gvk.GroupKind(), gvk.Version)
if err != nil {
return false, err
}
return mapping.Scope == meta.RESTScopeNamespace, nil
}
func (m *resourcemapper) IsPreferred(gvr schema.GroupVersionResource) (bool, error) {
gvrs, err := m.mapper.ResourcesFor(gvr.GroupResource().WithVersion(""))
if err != nil {
return false, err
}
return gvrs[0] == gvr, nil
}
func (m *resourcemapper) Preferred(gvr schema.GroupVersionResource) (schema.GroupVersionResource, error) {
gvrs, err := m.mapper.ResourcesFor(gvr.GroupResource().WithVersion(""))
if err != nil {
return schema.GroupVersionResource{}, err
}
return gvrs[0], nil
}
func (m *resourcemapper) ExistsGVR(gvr schema.GroupVersionResource) (bool, error) {
_, err := m.mapper.ResourceFor(gvr)
if meta.IsNoMatchError(err) {
return false, nil
} else if err != nil {
return false, err
}
return true, nil
}
func (m *resourcemapper) ExistsGVK(gvk schema.GroupVersionKind) (bool, error) {
_, err := m.mapper.RESTMapping(gvk.GroupKind(), gvk.Version)
if meta.IsNoMatchError(err) {
return false, nil
} else if err != nil {
return false, err
}
return true, nil
}
func (m *resourcemapper) Reset() {
type ResetCache interface {
Reset()
}
if c, ok := m.mapper.(ResetCache); ok {
c.Reset()
}
}