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restclientgetter.go
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restclientgetter.go
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/*
Copyright 2020 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 client
import (
"sync"
"k8s.io/apimachinery/pkg/api/meta"
"k8s.io/cli-runtime/pkg/genericclioptions"
"k8s.io/client-go/discovery"
cached "k8s.io/client-go/discovery/cached"
"k8s.io/client-go/rest"
"k8s.io/client-go/tools/clientcmd"
clientcmdapi "k8s.io/client-go/tools/clientcmd/api"
)
func newRESTClientGetter(cfg *rest.Config, rm meta.RESTMapper, ns string) *namespacedRCG {
return &namespacedRCG{
restClientGetter: &restClientGetter{
restConfig: cfg,
restMapper: rm,
},
namespaceConfig: namespaceClientConfig{ns},
}
}
type restClientGetter struct {
restConfig *rest.Config
restMapper meta.RESTMapper
setupDiscoveryClient sync.Once
cachedDiscoveryClient discovery.CachedDiscoveryInterface
}
func (c *restClientGetter) ToRESTConfig() (*rest.Config, error) {
return rest.CopyConfig(c.restConfig), nil
}
func (c *restClientGetter) ToDiscoveryClient() (discovery.CachedDiscoveryInterface, error) {
var (
dc discovery.DiscoveryInterface
err error
)
c.setupDiscoveryClient.Do(func() {
dc, err = discovery.NewDiscoveryClientForConfig(c.restConfig)
if err != nil {
return
}
c.cachedDiscoveryClient = cached.NewMemCacheClient(dc)
})
if err != nil {
return nil, err
}
return c.cachedDiscoveryClient, nil
}
func (c *restClientGetter) ToRESTMapper() (meta.RESTMapper, error) {
return c.restMapper, nil
}
func (c *restClientGetter) ForNamespace(ns string) genericclioptions.RESTClientGetter {
return &namespacedRCG{
restClientGetter: c,
namespaceConfig: namespaceClientConfig{namespace: ns},
}
}
var _ genericclioptions.RESTClientGetter = &namespacedRCG{}
type namespacedRCG struct {
*restClientGetter
namespaceConfig namespaceClientConfig
}
func (c *namespacedRCG) ToRawKubeConfigLoader() clientcmd.ClientConfig {
return c.namespaceConfig
}
var _ clientcmd.ClientConfig = &namespaceClientConfig{}
type namespaceClientConfig struct {
namespace string
}
func (c namespaceClientConfig) RawConfig() (clientcmdapi.Config, error) {
return clientcmdapi.Config{}, nil
}
func (c namespaceClientConfig) ClientConfig() (*rest.Config, error) {
return nil, nil
}
func (c namespaceClientConfig) Namespace() (string, bool, error) {
return c.namespace, false, nil
}
func (c namespaceClientConfig) ConfigAccess() clientcmd.ConfigAccess {
return nil
}