e298aa39c3
Delays the error until the first call and then preserves it for others. More closely matches the intent of the Object() calls. Loaders are now lazy and don't need to return errors directly. Sets the stage for collapsing unstructured and structured builders together.
139 lines
5.0 KiB
Go
139 lines
5.0 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 util
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import (
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"strings"
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"github.com/golang/glog"
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"k8s.io/apimachinery/pkg/api/meta"
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"k8s.io/apimachinery/pkg/runtime/schema"
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"k8s.io/client-go/discovery"
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"k8s.io/kubernetes/pkg/kubectl"
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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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}
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var _ meta.RESTMapper = &shortcutExpander{}
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func NewShortcutExpander(delegate meta.RESTMapper, client discovery.DiscoveryInterface) shortcutExpander {
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return shortcutExpander{RESTMapper: delegate, discoveryClient: client}
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}
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func (e shortcutExpander) KindFor(resource schema.GroupVersionResource) (schema.GroupVersionKind, error) {
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return e.RESTMapper.KindFor(e.expandResourceShortcut(resource))
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}
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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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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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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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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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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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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() ([]kubectl.ResourceShortcuts, error) {
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res := []kubectl.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.ServerResources()
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if err != nil {
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glog.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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for _, apiRes := range apiResources.APIResources {
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for _, shortName := range apiRes.ShortNames {
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gv, err := schema.ParseGroupVersion(apiResources.GroupVersion)
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if err != nil {
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glog.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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rs := kubectl.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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// append hardcoded short forms at the end of the list
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res = append(res, kubectl.ResourcesShortcutStatic...)
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return 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 resources, err := e.getShortcutMappings(); err == nil {
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for _, item := range resources {
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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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resource.Resource = item.LongForm.Resource
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return resource
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}
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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 resources {
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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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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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