/
uclient.go
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/
uclient.go
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// Copyright 2019 The Operator-SDK 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 kubemetrics
import (
"fmt"
"github.com/pkg/errors"
metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
"k8s.io/apimachinery/pkg/runtime/schema"
"k8s.io/apimachinery/pkg/runtime/serializer"
"k8s.io/client-go/dynamic"
"k8s.io/client-go/kubernetes"
"k8s.io/client-go/kubernetes/scheme"
"k8s.io/client-go/rest"
)
func newClientForGVK(cfg *rest.Config, apiVersion, kind string) (dynamic.NamespaceableResourceInterface, error) {
apiResourceList, apiResource, err := getAPIResource(cfg, apiVersion, kind)
if err != nil {
return nil, errors.Wrapf(err, "discovering resource information failed for %s in %s", kind, apiVersion)
}
dc, err := newForConfig(cfg, apiResourceList.GroupVersion)
if err != nil {
return nil, errors.Wrapf(err, "creating dynamic client failed for %s", apiResourceList.GroupVersion)
}
gv, err := schema.ParseGroupVersion(apiResourceList.GroupVersion)
if err != nil {
return nil, errors.Wrapf(err, "parsing GroupVersion %s failed", apiResourceList.GroupVersion)
}
gvr := schema.GroupVersionResource{
Group: gv.Group,
Version: gv.Version,
Resource: apiResource.Name,
}
return dc.Resource(gvr), nil
}
func getAPIResource(cfg *rest.Config, apiVersion, kind string) (*metav1.APIResourceList, *metav1.APIResource, error) {
kclient, err := kubernetes.NewForConfig(cfg)
if err != nil {
return nil, nil, err
}
apiResourceLists, err := kclient.Discovery().ServerResources()
if err != nil {
return nil, nil, err
}
for _, apiResourceList := range apiResourceLists {
if apiResourceList.GroupVersion == apiVersion {
for _, r := range apiResourceList.APIResources {
if r.Kind == kind {
return apiResourceList, &r, nil
}
}
}
}
return nil, nil, fmt.Errorf("apiVersion %s and kind %s not found available in Kubernetes cluster", apiVersion, kind)
}
func newForConfig(c *rest.Config, groupVersion string) (dynamic.Interface, error) {
config := rest.CopyConfig(c)
err := setConfigDefaults(groupVersion, config)
if err != nil {
return nil, err
}
return dynamic.NewForConfig(config)
}
func setConfigDefaults(groupVersion string, config *rest.Config) error {
gv, err := schema.ParseGroupVersion(groupVersion)
if err != nil {
return err
}
config.GroupVersion = &gv
config.APIPath = "/apis"
if config.GroupVersion.Group == "" && config.GroupVersion.Version == "v1" {
config.APIPath = "/api"
}
config.NegotiatedSerializer = serializer.DirectCodecFactory{CodecFactory: scheme.Codecs}
return nil
}