mirror of https://github.com/k3s-io/k3s
110 lines
2.5 KiB
Go
110 lines
2.5 KiB
Go
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/*
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Copyright 2018 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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"fmt"
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"reflect"
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metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
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"k8s.io/apimachinery/pkg/apis/meta/v1/unstructured"
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"k8s.io/apimachinery/pkg/runtime/schema"
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"k8s.io/client-go/dynamic"
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)
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// CRDGetter is a function that can download the list of GVK for all
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// CRDs.
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type CRDGetter func() ([]schema.GroupKind, error)
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func CRDFromDynamic(client dynamic.Interface) CRDGetter {
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return func() ([]schema.GroupKind, error) {
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list, err := client.Resource(schema.GroupVersionResource{
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Group: "apiextensions.k8s.io",
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Version: "v1beta1",
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Resource: "customresourcedefinitions",
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}).List(metav1.ListOptions{})
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if err != nil {
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return nil, fmt.Errorf("failed to list CRDs: %v", err)
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}
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if list == nil {
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return nil, nil
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}
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gks := []schema.GroupKind{}
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// We need to parse the list to get the gvk, I guess that's fine.
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for _, crd := range (*list).Items {
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// Look for group, version, and kind
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group, _, _ := unstructured.NestedString(crd.Object, "spec", "group")
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kind, _, _ := unstructured.NestedString(crd.Object, "spec", "names", "kind")
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gks = append(gks, schema.GroupKind{
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Group: group,
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Kind: kind,
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})
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}
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return gks, nil
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}
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}
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// CRDFinder keeps a cache of known CRDs and finds a given GVK in the
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// list.
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type CRDFinder interface {
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HasCRD(gvk schema.GroupKind) (bool, error)
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}
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func NewCRDFinder(getter CRDGetter) CRDFinder {
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return &crdFinder{
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getter: getter,
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}
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}
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type crdFinder struct {
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getter CRDGetter
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cache *[]schema.GroupKind
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}
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func (f *crdFinder) cacheCRDs() error {
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if f.cache != nil {
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return nil
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}
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list, err := f.getter()
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if err != nil {
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return err
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}
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f.cache = &list
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return nil
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}
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func (f *crdFinder) findCRD(gvk schema.GroupKind) bool {
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for _, crd := range *f.cache {
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if reflect.DeepEqual(gvk, crd) {
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return true
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}
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}
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return false
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}
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func (f *crdFinder) HasCRD(gvk schema.GroupKind) (bool, error) {
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if err := f.cacheCRDs(); err != nil {
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return false, err
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}
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return f.findCRD(gvk), nil
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}
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