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k8s.go
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k8s.go
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package services
import (
"fmt"
"os"
"path/filepath"
cloudv1alpha1 "github.com/didil/kubexcloud/kxc-operator/api/v1alpha1"
"k8s.io/apimachinery/pkg/runtime"
clientgoscheme "k8s.io/client-go/kubernetes/scheme"
"k8s.io/client-go/rest"
"k8s.io/client-go/tools/clientcmd"
"k8s.io/client-go/util/homedir"
"sigs.k8s.io/controller-runtime/pkg/client"
)
type K8sSvc interface {
Client() client.Client
}
type K8sService struct {
client client.Client
}
func NewK8sService() (*K8sService, error) {
svc := &K8sService{}
// init runtime scheme
scheme := runtime.NewScheme()
// add k8s scheme
err := clientgoscheme.AddToScheme(scheme)
if err != nil {
return nil, fmt.Errorf("clientgoscheme: %v", err)
}
// add crd schemes
err = cloudv1alpha1.AddToScheme(scheme)
if err != nil {
return nil, fmt.Errorf("cloudv1alpha1: %v", err)
}
client, err := svc.initK8sClient(scheme)
if err != nil {
return nil, fmt.Errorf("initK8sClient: %v", err)
}
svc.client = client
return svc, nil
}
func (svc *K8sService) initK8sClient(scheme *runtime.Scheme) (client.Client, error) {
config, err := svc.getInClusterConfig()
if err != nil {
return nil, err
}
if config == nil {
config, err = svc.getOutOfClusterConfig()
if err != nil {
return nil, err
}
}
client, err := client.New(config, client.Options{Scheme: scheme})
if err != nil {
return nil, err
}
return client, nil
}
func (svc *K8sService) getInClusterConfig() (*rest.Config, error) {
config, err := rest.InClusterConfig()
if err == rest.ErrNotInCluster {
return nil, nil
}
if err != nil {
return nil, err
}
return config, nil
}
func (svc *K8sService) getOutOfClusterConfig() (*rest.Config, error) {
var kubeconfig string
if kubeconfigenv := os.Getenv("KUBECONFIG"); kubeconfigenv != "" {
kubeconfig = kubeconfigenv
} else if home := homedir.HomeDir(); home != "" {
kubeconfig = filepath.Join(home, ".kube", "config")
}
if kubeconfig == "" {
return nil, fmt.Errorf("out of cluster: cloud not find a kubeconfig")
}
// use the current context in kubeconfig
config, err := clientcmd.BuildConfigFromFlags("", kubeconfig)
if err != nil {
return nil, err
}
return config, nil
}
func (svc *K8sService) Client() client.Client {
return svc.client
}