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kube.go
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kube.go
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// Copyright 2021 FairwindsOps, Inc.
//
// 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 helm
import (
"context"
"fmt"
"os"
"sync"
"k8s.io/client-go/dynamic"
"k8s.io/client-go/kubernetes"
"k8s.io/klog/v2"
// This is required to auth to cloud providers (i.e. GKE)
_ "k8s.io/client-go/plugin/pkg/client/auth"
"k8s.io/client-go/rest"
"sigs.k8s.io/controller-runtime/pkg/client/apiutil"
"sigs.k8s.io/controller-runtime/pkg/client/config"
"k8s.io/apimachinery/pkg/api/meta"
)
// kube wraps a kubernetes client interface
type kube struct {
Client kubernetes.Interface
}
// GetData fulfills the kubernetes client interface in the fairwinds opa package
func (h *kube) GetData(ctx context.Context, group, kind string) ([]interface{}, error) {
return nil, nil
}
// getKubeInstance returns a Kubernetes interface
func getKubeInstance() *kube {
var kubeClient *kube
once.Do(func() {
kubeClient = &kube{
Client: getKubeClient(),
}
})
return kubeClient
}
type dynamicClientInstance struct {
Client dynamic.Interface
RESTMapper meta.RESTMapper
}
var once sync.Once
var clientOnceDynamic sync.Once
// getKubeClient returns a clientset instance
func getKubeClient() *kubernetes.Clientset {
kubeConf, err := config.GetConfig()
if err != nil {
fmt.Println("Error getting kubeconfig:", err)
os.Exit(1)
}
clientset, err := kubernetes.NewForConfig(kubeConf)
if err != nil {
fmt.Println("Error creating kubernetes client:", err)
os.Exit(1)
}
return clientset
}
// GetDynamicInstance returns a dynamic client instance
func getDynamicInstance() *dynamicClientInstance {
var dynamicClient *dynamicClientInstance
clientOnceDynamic.Do(func() {
dynamicClient = &dynamicClientInstance{
Client: getKubeClientDynamic(),
RESTMapper: getRESTMapper(),
}
})
return dynamicClient
}
func getKubeClientDynamic() dynamic.Interface {
kubeConf, err := config.GetConfig()
if err != nil {
klog.Fatalf("Error getting kubeconfig: %v", err)
}
clientset, err := dynamic.NewForConfig(kubeConf)
if err != nil {
klog.Fatalf("Error creating dynamic kubernetes client: %v", err)
}
return clientset
}
func getRESTMapper() meta.RESTMapper {
kubeConf, err := config.GetConfig()
if err != nil {
klog.Fatalf("Error getting kubeconfig: %v", err)
}
httpClient, err := rest.HTTPClientFor(kubeConf)
if err != nil {
klog.Fatal("error creating httpClient using kubeconfig: %s", err.Error())
}
restmapper, err := apiutil.NewDynamicRESTMapper(kubeConf, httpClient)
if err != nil {
klog.Fatalf("Error creating REST Mapper: %v", err)
}
return restmapper
}