mirror of
https://github.com/ceph/ceph-csi.git
synced 2024-11-24 07:10:20 +00:00
212 lines
7.8 KiB
Go
212 lines
7.8 KiB
Go
/*
|
|
Copyright 2016 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 restmapper
|
|
|
|
import (
|
|
"fmt"
|
|
"strings"
|
|
|
|
"k8s.io/klog/v2"
|
|
|
|
"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"
|
|
)
|
|
|
|
// shortcutExpander is a RESTMapper that can be used for Kubernetes resources. It expands the resource first, then invokes the wrapped
|
|
type shortcutExpander struct {
|
|
RESTMapper meta.RESTMapper
|
|
|
|
discoveryClient discovery.DiscoveryInterface
|
|
|
|
warningHandler func(string)
|
|
}
|
|
|
|
var _ meta.ResettableRESTMapper = shortcutExpander{}
|
|
|
|
// NewShortcutExpander wraps a restmapper in a layer that expands shortcuts found via discovery
|
|
func NewShortcutExpander(delegate meta.RESTMapper, client discovery.DiscoveryInterface, warningHandler func(string)) meta.RESTMapper {
|
|
return shortcutExpander{RESTMapper: delegate, discoveryClient: client, warningHandler: warningHandler}
|
|
}
|
|
|
|
// KindFor fulfills meta.RESTMapper
|
|
func (e shortcutExpander) KindFor(resource schema.GroupVersionResource) (schema.GroupVersionKind, error) {
|
|
// expandResourceShortcut works with current API resources as read from discovery cache.
|
|
// In case of new CRDs this means we potentially don't have current state of discovery.
|
|
// In the current wiring in k8s.io/cli-runtime/pkg/genericclioptions/config_flags.go#toRESTMapper,
|
|
// we are using DeferredDiscoveryRESTMapper which on KindFor failure will clear the
|
|
// cache and fetch all data from a cluster (see k8s.io/client-go/restmapper/discovery.go#KindFor).
|
|
// Thus another call to expandResourceShortcut, after a NoMatchError should successfully
|
|
// read Kind to the user or an error.
|
|
gvk, err := e.RESTMapper.KindFor(e.expandResourceShortcut(resource))
|
|
if meta.IsNoMatchError(err) {
|
|
return e.RESTMapper.KindFor(e.expandResourceShortcut(resource))
|
|
}
|
|
return gvk, err
|
|
}
|
|
|
|
// KindsFor fulfills meta.RESTMapper
|
|
func (e shortcutExpander) KindsFor(resource schema.GroupVersionResource) ([]schema.GroupVersionKind, error) {
|
|
return e.RESTMapper.KindsFor(e.expandResourceShortcut(resource))
|
|
}
|
|
|
|
// ResourcesFor fulfills meta.RESTMapper
|
|
func (e shortcutExpander) ResourcesFor(resource schema.GroupVersionResource) ([]schema.GroupVersionResource, error) {
|
|
return e.RESTMapper.ResourcesFor(e.expandResourceShortcut(resource))
|
|
}
|
|
|
|
// ResourceFor fulfills meta.RESTMapper
|
|
func (e shortcutExpander) ResourceFor(resource schema.GroupVersionResource) (schema.GroupVersionResource, error) {
|
|
return e.RESTMapper.ResourceFor(e.expandResourceShortcut(resource))
|
|
}
|
|
|
|
// ResourceSingularizer fulfills meta.RESTMapper
|
|
func (e shortcutExpander) ResourceSingularizer(resource string) (string, error) {
|
|
return e.RESTMapper.ResourceSingularizer(e.expandResourceShortcut(schema.GroupVersionResource{Resource: resource}).Resource)
|
|
}
|
|
|
|
// RESTMapping fulfills meta.RESTMapper
|
|
func (e shortcutExpander) RESTMapping(gk schema.GroupKind, versions ...string) (*meta.RESTMapping, error) {
|
|
return e.RESTMapper.RESTMapping(gk, versions...)
|
|
}
|
|
|
|
// RESTMappings fulfills meta.RESTMapper
|
|
func (e shortcutExpander) RESTMappings(gk schema.GroupKind, versions ...string) ([]*meta.RESTMapping, error) {
|
|
return e.RESTMapper.RESTMappings(gk, versions...)
|
|
}
|
|
|
|
// getShortcutMappings returns a set of tuples which holds short names for resources.
|
|
// First the list of potential resources will be taken from the API server.
|
|
// Next we will append the hardcoded list of resources - to be backward compatible with old servers.
|
|
// NOTE that the list is ordered by group priority.
|
|
func (e shortcutExpander) getShortcutMappings() ([]*metav1.APIResourceList, []resourceShortcuts, error) {
|
|
res := []resourceShortcuts{}
|
|
// get server resources
|
|
// This can return an error *and* the results it was able to find. We don't need to fail on the error.
|
|
_, apiResList, err := e.discoveryClient.ServerGroupsAndResources()
|
|
if err != nil {
|
|
klog.V(1).Infof("Error loading discovery information: %v", err)
|
|
}
|
|
for _, apiResources := range apiResList {
|
|
gv, err := schema.ParseGroupVersion(apiResources.GroupVersion)
|
|
if err != nil {
|
|
klog.V(1).Infof("Unable to parse groupversion = %s due to = %s", apiResources.GroupVersion, err.Error())
|
|
continue
|
|
}
|
|
for _, apiRes := range apiResources.APIResources {
|
|
for _, shortName := range apiRes.ShortNames {
|
|
rs := resourceShortcuts{
|
|
ShortForm: schema.GroupResource{Group: gv.Group, Resource: shortName},
|
|
LongForm: schema.GroupResource{Group: gv.Group, Resource: apiRes.Name},
|
|
}
|
|
res = append(res, rs)
|
|
}
|
|
}
|
|
}
|
|
|
|
return apiResList, res, nil
|
|
}
|
|
|
|
// expandResourceShortcut will return the expanded version of resource
|
|
// (something that a pkg/api/meta.RESTMapper can understand), if it is
|
|
// indeed a shortcut. If no match has been found, we will match on group prefixing.
|
|
// Lastly we will return resource unmodified.
|
|
func (e shortcutExpander) expandResourceShortcut(resource schema.GroupVersionResource) schema.GroupVersionResource {
|
|
// get the shortcut mappings and return on first match.
|
|
if allResources, shortcutResources, err := e.getShortcutMappings(); err == nil {
|
|
// avoid expanding if there's an exact match to a full resource name
|
|
for _, apiResources := range allResources {
|
|
gv, err := schema.ParseGroupVersion(apiResources.GroupVersion)
|
|
if err != nil {
|
|
continue
|
|
}
|
|
if len(resource.Group) != 0 && resource.Group != gv.Group {
|
|
continue
|
|
}
|
|
for _, apiRes := range apiResources.APIResources {
|
|
if resource.Resource == apiRes.Name {
|
|
return resource
|
|
}
|
|
if resource.Resource == apiRes.SingularName {
|
|
return resource
|
|
}
|
|
}
|
|
}
|
|
|
|
found := false
|
|
var rsc schema.GroupVersionResource
|
|
warnedAmbiguousShortcut := make(map[schema.GroupResource]bool)
|
|
for _, item := range shortcutResources {
|
|
if len(resource.Group) != 0 && resource.Group != item.ShortForm.Group {
|
|
continue
|
|
}
|
|
if resource.Resource == item.ShortForm.Resource {
|
|
if found {
|
|
if item.LongForm.Group == rsc.Group && item.LongForm.Resource == rsc.Resource {
|
|
// It is common and acceptable that group/resource has multiple
|
|
// versions registered in cluster. This does not introduce ambiguity
|
|
// in terms of shortname usage.
|
|
continue
|
|
}
|
|
if !warnedAmbiguousShortcut[item.LongForm] {
|
|
if e.warningHandler != nil {
|
|
e.warningHandler(fmt.Sprintf("short name %q could also match lower priority resource %s", resource.Resource, item.LongForm.String()))
|
|
}
|
|
warnedAmbiguousShortcut[item.LongForm] = true
|
|
}
|
|
continue
|
|
}
|
|
rsc.Resource = item.LongForm.Resource
|
|
rsc.Group = item.LongForm.Group
|
|
found = true
|
|
}
|
|
}
|
|
if found {
|
|
return rsc
|
|
}
|
|
|
|
// we didn't find exact match so match on group prefixing. This allows autoscal to match autoscaling
|
|
if len(resource.Group) == 0 {
|
|
return resource
|
|
}
|
|
for _, item := range shortcutResources {
|
|
if !strings.HasPrefix(item.ShortForm.Group, resource.Group) {
|
|
continue
|
|
}
|
|
if resource.Resource == item.ShortForm.Resource {
|
|
resource.Resource = item.LongForm.Resource
|
|
resource.Group = item.LongForm.Group
|
|
return resource
|
|
}
|
|
}
|
|
}
|
|
|
|
return resource
|
|
}
|
|
|
|
func (e shortcutExpander) Reset() {
|
|
meta.MaybeResetRESTMapper(e.RESTMapper)
|
|
}
|
|
|
|
// ResourceShortcuts represents a structure that holds the information how to
|
|
// transition from resource's shortcut to its full name.
|
|
type resourceShortcuts struct {
|
|
ShortForm schema.GroupResource
|
|
LongForm schema.GroupResource
|
|
}
|