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107 lines
3.5 KiB
107 lines
3.5 KiB
/*
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Copyright The Helm 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 engine
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import (
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"log"
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"strings"
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"github.com/pkg/errors"
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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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"k8s.io/client-go/dynamic"
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"k8s.io/client-go/rest"
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)
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type lookupFunc = func(apiversion string, resource string, namespace string, name string) (map[string]interface{}, error)
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func NewLookupFunction(config *rest.Config) lookupFunc {
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return func(apiversion string, resource string, namespace string, name string) (map[string]interface{}, error) {
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var client dynamic.ResourceInterface
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c, namespaced, err := getDynamicClientOnKind(apiversion, resource, config)
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if err != nil {
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return map[string]interface{}{}, err
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}
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if namespaced && namespace != "" {
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client = c.Namespace(namespace)
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} else {
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client = c
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}
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if name != "" {
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//this will return a single object
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obj, err := client.Get(name, metav1.GetOptions{})
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if err != nil {
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return map[string]interface{}{}, err
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}
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return obj.UnstructuredContent(), nil
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}
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//this will return a list
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obj, err := client.List(metav1.ListOptions{})
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if err != nil {
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return map[string]interface{}{}, err
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}
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return obj.UnstructuredContent(), nil
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}
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}
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// getDynamicClientOnUnstructured returns a dynamic client on an Unstructured type. This client can be further namespaced.
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func getDynamicClientOnKind(apiversion string, kind string, config *rest.Config) (dynamic.NamespaceableResourceInterface, bool, error) {
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gvk := schema.FromAPIVersionAndKind(apiversion, kind)
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apiRes, err := getAPIReourceForGVK(gvk, config)
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if err != nil {
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log.Printf("[ERROR] unable to get apiresource from unstructured: %s , error %s", gvk.String(), err)
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return nil, false, errors.Wrapf(err, "unable to get apiresource from unstructured: %s", gvk.String())
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}
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gvr := schema.GroupVersionResource{
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Group: apiRes.Group,
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Version: apiRes.Version,
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Resource: apiRes.Name,
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}
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intf, err := dynamic.NewForConfig(config)
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if err != nil {
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log.Printf("[ERROR] unable to get dynamic client %s", err)
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return nil, false, err
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}
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res := intf.Resource(gvr)
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return res, apiRes.Namespaced, nil
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}
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func getAPIReourceForGVK(gvk schema.GroupVersionKind, config *rest.Config) (metav1.APIResource, error) {
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res := metav1.APIResource{}
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discoveryClient, err := discovery.NewDiscoveryClientForConfig(config)
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if err != nil {
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log.Printf("[ERROR] unable to create discovery client %s", err)
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return res, err
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}
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resList, err := discoveryClient.ServerResourcesForGroupVersion(gvk.GroupVersion().String())
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if err != nil {
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log.Printf("[ERROR] unable to retrieve resource list for: %s , error: %s", gvk.GroupVersion().String(), err)
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return res, err
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}
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for _, resource := range resList.APIResources {
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//if a resource contains a "/" it's referencing a subresource. we don't support suberesource for now.
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if resource.Kind == gvk.Kind && !strings.Contains(resource.Name, "/") {
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res = resource
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res.Group = gvk.Group
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res.Version = gvk.Version
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break
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}
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}
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return res, nil
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}
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