mirror of
https://github.com/ceph/ceph-csi.git
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212 lines
7.8 KiB
Go
212 lines
7.8 KiB
Go
/*
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Copyright 2016 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 restmapper
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import (
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"fmt"
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"strings"
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"k8s.io/klog/v2"
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"k8s.io/apimachinery/pkg/api/meta"
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metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
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"k8s.io/apimachinery/pkg/runtime/schema"
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"k8s.io/client-go/discovery"
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)
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// shortcutExpander is a RESTMapper that can be used for Kubernetes resources. It expands the resource first, then invokes the wrapped
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type shortcutExpander struct {
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RESTMapper meta.RESTMapper
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discoveryClient discovery.DiscoveryInterface
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warningHandler func(string)
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}
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var _ meta.ResettableRESTMapper = shortcutExpander{}
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// NewShortcutExpander wraps a restmapper in a layer that expands shortcuts found via discovery
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func NewShortcutExpander(delegate meta.RESTMapper, client discovery.DiscoveryInterface, warningHandler func(string)) meta.RESTMapper {
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return shortcutExpander{RESTMapper: delegate, discoveryClient: client, warningHandler: warningHandler}
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}
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// KindFor fulfills meta.RESTMapper
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func (e shortcutExpander) KindFor(resource schema.GroupVersionResource) (schema.GroupVersionKind, error) {
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// expandResourceShortcut works with current API resources as read from discovery cache.
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// In case of new CRDs this means we potentially don't have current state of discovery.
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// In the current wiring in k8s.io/cli-runtime/pkg/genericclioptions/config_flags.go#toRESTMapper,
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// we are using DeferredDiscoveryRESTMapper which on KindFor failure will clear the
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// cache and fetch all data from a cluster (see k8s.io/client-go/restmapper/discovery.go#KindFor).
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// Thus another call to expandResourceShortcut, after a NoMatchError should successfully
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// read Kind to the user or an error.
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gvk, err := e.RESTMapper.KindFor(e.expandResourceShortcut(resource))
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if meta.IsNoMatchError(err) {
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return e.RESTMapper.KindFor(e.expandResourceShortcut(resource))
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}
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return gvk, err
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}
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// KindsFor fulfills meta.RESTMapper
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func (e shortcutExpander) KindsFor(resource schema.GroupVersionResource) ([]schema.GroupVersionKind, error) {
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return e.RESTMapper.KindsFor(e.expandResourceShortcut(resource))
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}
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// ResourcesFor fulfills meta.RESTMapper
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func (e shortcutExpander) ResourcesFor(resource schema.GroupVersionResource) ([]schema.GroupVersionResource, error) {
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return e.RESTMapper.ResourcesFor(e.expandResourceShortcut(resource))
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}
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// ResourceFor fulfills meta.RESTMapper
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func (e shortcutExpander) ResourceFor(resource schema.GroupVersionResource) (schema.GroupVersionResource, error) {
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return e.RESTMapper.ResourceFor(e.expandResourceShortcut(resource))
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}
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// ResourceSingularizer fulfills meta.RESTMapper
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func (e shortcutExpander) ResourceSingularizer(resource string) (string, error) {
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return e.RESTMapper.ResourceSingularizer(e.expandResourceShortcut(schema.GroupVersionResource{Resource: resource}).Resource)
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}
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// RESTMapping fulfills meta.RESTMapper
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func (e shortcutExpander) RESTMapping(gk schema.GroupKind, versions ...string) (*meta.RESTMapping, error) {
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return e.RESTMapper.RESTMapping(gk, versions...)
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}
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// RESTMappings fulfills meta.RESTMapper
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func (e shortcutExpander) RESTMappings(gk schema.GroupKind, versions ...string) ([]*meta.RESTMapping, error) {
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return e.RESTMapper.RESTMappings(gk, versions...)
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}
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// getShortcutMappings returns a set of tuples which holds short names for resources.
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// First the list of potential resources will be taken from the API server.
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// Next we will append the hardcoded list of resources - to be backward compatible with old servers.
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// NOTE that the list is ordered by group priority.
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func (e shortcutExpander) getShortcutMappings() ([]*metav1.APIResourceList, []resourceShortcuts, error) {
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res := []resourceShortcuts{}
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// get server resources
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// This can return an error *and* the results it was able to find. We don't need to fail on the error.
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_, apiResList, err := e.discoveryClient.ServerGroupsAndResources()
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if err != nil {
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klog.V(1).Infof("Error loading discovery information: %v", err)
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}
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for _, apiResources := range apiResList {
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gv, err := schema.ParseGroupVersion(apiResources.GroupVersion)
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if err != nil {
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klog.V(1).Infof("Unable to parse groupversion = %s due to = %s", apiResources.GroupVersion, err.Error())
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continue
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}
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for _, apiRes := range apiResources.APIResources {
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for _, shortName := range apiRes.ShortNames {
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rs := resourceShortcuts{
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ShortForm: schema.GroupResource{Group: gv.Group, Resource: shortName},
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LongForm: schema.GroupResource{Group: gv.Group, Resource: apiRes.Name},
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}
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res = append(res, rs)
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}
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}
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}
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return apiResList, res, nil
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}
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// expandResourceShortcut will return the expanded version of resource
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// (something that a pkg/api/meta.RESTMapper can understand), if it is
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// indeed a shortcut. If no match has been found, we will match on group prefixing.
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// Lastly we will return resource unmodified.
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func (e shortcutExpander) expandResourceShortcut(resource schema.GroupVersionResource) schema.GroupVersionResource {
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// get the shortcut mappings and return on first match.
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if allResources, shortcutResources, err := e.getShortcutMappings(); err == nil {
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// avoid expanding if there's an exact match to a full resource name
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for _, apiResources := range allResources {
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gv, err := schema.ParseGroupVersion(apiResources.GroupVersion)
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if err != nil {
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continue
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}
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if len(resource.Group) != 0 && resource.Group != gv.Group {
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continue
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}
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for _, apiRes := range apiResources.APIResources {
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if resource.Resource == apiRes.Name {
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return resource
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}
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if resource.Resource == apiRes.SingularName {
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return resource
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}
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}
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}
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found := false
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var rsc schema.GroupVersionResource
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warnedAmbiguousShortcut := make(map[schema.GroupResource]bool)
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for _, item := range shortcutResources {
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if len(resource.Group) != 0 && resource.Group != item.ShortForm.Group {
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continue
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}
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if resource.Resource == item.ShortForm.Resource {
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if found {
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if item.LongForm.Group == rsc.Group && item.LongForm.Resource == rsc.Resource {
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// It is common and acceptable that group/resource has multiple
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// versions registered in cluster. This does not introduce ambiguity
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// in terms of shortname usage.
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continue
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}
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if !warnedAmbiguousShortcut[item.LongForm] {
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if e.warningHandler != nil {
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e.warningHandler(fmt.Sprintf("short name %q could also match lower priority resource %s", resource.Resource, item.LongForm.String()))
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}
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warnedAmbiguousShortcut[item.LongForm] = true
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}
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continue
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}
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rsc.Resource = item.LongForm.Resource
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rsc.Group = item.LongForm.Group
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found = true
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}
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}
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if found {
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return rsc
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}
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// we didn't find exact match so match on group prefixing. This allows autoscal to match autoscaling
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if len(resource.Group) == 0 {
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return resource
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}
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for _, item := range shortcutResources {
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if !strings.HasPrefix(item.ShortForm.Group, resource.Group) {
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continue
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}
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if resource.Resource == item.ShortForm.Resource {
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resource.Resource = item.LongForm.Resource
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resource.Group = item.LongForm.Group
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return resource
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}
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}
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}
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return resource
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}
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func (e shortcutExpander) Reset() {
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meta.MaybeResetRESTMapper(e.RESTMapper)
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}
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// ResourceShortcuts represents a structure that holds the information how to
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// transition from resource's shortcut to its full name.
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type resourceShortcuts struct {
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ShortForm schema.GroupResource
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LongForm schema.GroupResource
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}
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