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util.go
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util.go
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/*
Copyright 2018 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 enable
import (
"fmt"
"io"
"os"
"strings"
"github.com/pkg/errors"
apiextv1b1 "k8s.io/apiextensions-apiserver/pkg/apis/apiextensions/v1beta1"
metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
"k8s.io/apimachinery/pkg/runtime/schema"
"k8s.io/apimachinery/pkg/util/yaml"
"k8s.io/client-go/discovery"
"k8s.io/client-go/rest"
"github.com/kubernetes-sigs/federation-v2/pkg/apis/core/typeconfig"
)
func DecodeYAMLFromFile(filename string, obj interface{}) error {
f, err := os.Open(filename)
if err != nil {
return err
}
defer f.Close()
return DecodeYAML(f, obj)
}
func DecodeYAML(r io.Reader, obj interface{}) error {
decoder := yaml.NewYAMLToJSONDecoder(r)
return decoder.Decode(obj)
}
func CrdForAPIResource(apiResource metav1.APIResource, validation *apiextv1b1.CustomResourceValidation, shortNames []string) *apiextv1b1.CustomResourceDefinition {
scope := apiextv1b1.ClusterScoped
if apiResource.Namespaced {
scope = apiextv1b1.NamespaceScoped
}
return &apiextv1b1.CustomResourceDefinition{
// Explicitly including TypeMeta will ensure it will be
// serialized properly to yaml.
TypeMeta: metav1.TypeMeta{
Kind: "CustomResourceDefinition",
APIVersion: "apiextensions.k8s.io/v1beta1",
},
ObjectMeta: metav1.ObjectMeta{
Name: typeconfig.GroupQualifiedName(apiResource),
},
Spec: apiextv1b1.CustomResourceDefinitionSpec{
Group: apiResource.Group,
Version: apiResource.Version,
Scope: scope,
Names: apiextv1b1.CustomResourceDefinitionNames{
Plural: apiResource.Name,
Kind: apiResource.Kind,
ShortNames: shortNames,
},
Validation: validation,
},
}
}
func LookupAPIResource(config *rest.Config, key, targetVersion string) (*metav1.APIResource, error) {
resourceLists, err := GetServerPreferredResources(config)
if err != nil {
return nil, err
}
var targetResource *metav1.APIResource
var matchedResources []string
for _, resourceList := range resourceLists {
// The list holds the GroupVersion for its list of APIResources
gv, err := schema.ParseGroupVersion(resourceList.GroupVersion)
if err != nil {
return nil, errors.Wrap(err, "Error parsing GroupVersion")
}
if len(targetVersion) > 0 && gv.Version != targetVersion {
continue
}
for _, resource := range resourceList.APIResources {
group := gv.Group
if NameMatchesResource(key, resource, group) {
if targetResource == nil {
targetResource = resource.DeepCopy()
targetResource.Group = group
targetResource.Version = gv.Version
}
matchedResources = append(matchedResources, groupQualifiedName(resource.Name, gv.Group))
}
}
}
if len(matchedResources) > 1 {
return nil, errors.Errorf("Multiple resources are matched by %q: %s. A group-qualified plural name must be provided.", key, strings.Join(matchedResources, ", "))
}
if targetResource != nil {
return targetResource, nil
}
return nil, errors.Errorf("Unable to find api resource named %q.", key)
}
func NameMatchesResource(name string, apiResource metav1.APIResource, group string) bool {
lowerCaseName := strings.ToLower(name)
if lowerCaseName == apiResource.Name ||
lowerCaseName == apiResource.SingularName ||
lowerCaseName == strings.ToLower(apiResource.Kind) ||
lowerCaseName == fmt.Sprintf("%s.%s", apiResource.Name, group) {
return true
}
for _, shortName := range apiResource.ShortNames {
if lowerCaseName == strings.ToLower(shortName) {
return true
}
}
return false
}
func GetServerPreferredResources(config *rest.Config) ([]*metav1.APIResourceList, error) {
// TODO(marun) Consider using a caching scheme ala kubectl
client, err := discovery.NewDiscoveryClientForConfig(config)
if err != nil {
return nil, errors.Wrap(err, "Error creating discovery client")
}
resourceLists, err := client.ServerPreferredResources()
if err != nil {
return nil, errors.Wrap(err, "Error listing api resources")
}
return resourceLists, nil
}
func resourceKey(apiResource metav1.APIResource) string {
var group string
if len(apiResource.Group) == 0 {
group = "core"
} else {
group = apiResource.Group
}
var version string
if len(apiResource.Version) == 0 {
version = "v1"
} else {
version = apiResource.Version
}
return fmt.Sprintf("%s.%s/%s", apiResource.Name, group, version)
}
func groupQualifiedName(name, group string) string {
apiResource := metav1.APIResource{
Name: name,
Group: group,
}
return typeconfig.GroupQualifiedName(apiResource)
}