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main.go
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main.go
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package main
import (
"context"
"flag"
"fmt"
"log"
"os"
"os/exec"
"strings"
"time"
"github.com/ghodss/yaml"
"github.com/kubernetes-client/go/kubernetes/config/api"
v1 "k8s.io/api/core/v1"
metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
"k8s.io/apimachinery/pkg/watch"
"k8s.io/client-go/kubernetes"
"k8s.io/client-go/rest"
"k8s.io/client-go/tools/clientcmd"
)
var (
kubeconfig = flag.String("kubeconfig", "", "absolute path to the kubeconfig file")
namespace = flag.String("namespace", "", "namespace of deployment")
prefix = flag.String("prefix", "", "prefix filter for clusters")
)
var crbTemplateHead = `apiVersion: rbac.authorization.k8s.io/v1
kind: ClusterRoleBinding
metadata:
name: eks-connector-console-dashboard-full-access-clusterrole-binding
subjects:`
var crbTemplateUser = `
- kind: User
name: "%s"
apiGroup: rbac.authorization.k8s.io`
var crbTemplateFoot = `
roleRef:
kind: ClusterRole
name: eks-connector-console-dashboard-full-access-clusterrole
apiGroup: rbac.authorization.k8s.io
`
func main() {
flag.Parse()
var err error
var config *rest.Config
if *kubeconfig == "" {
config, err = rest.InClusterConfig()
if err != nil {
log.Fatal(err.Error())
}
} else {
config, err = clientcmd.BuildConfigFromFlags("", *kubeconfig)
}
if err != nil {
log.Fatal(err.Error())
}
clientset, err := kubernetes.NewForConfig(config)
if err != nil {
log.Fatal(err.Error())
}
watcher, err := clientset.CoreV1().Secrets(*namespace).Watch(context.Background(), metav1.ListOptions{})
if err != nil {
log.Fatal(err)
}
for event := range watcher.ResultChan() {
sec := event.Object.(*v1.Secret)
if strings.HasPrefix(sec.Name, *prefix) && strings.Contains(sec.Name, "-kubeconfig") {
cluName := strings.ReplaceAll(sec.Name, "-kubeconfig", "")
switch event.Type {
case watch.Added, watch.Modified:
fmt.Printf("Detected new kubeconfig secret %s\n", sec.Name)
kc := api.Config{}
err = yaml.Unmarshal(sec.Data["value"], &kc)
if err != nil {
fmt.Printf("failed to parse kubeconfg err:%v\n", err.Error())
continue
}
kcBytes, _ := yaml.Marshal(kc)
err := os.WriteFile(cluName, kcBytes, 0644)
if err != nil {
fmt.Printf("failed to create kubeconfig file for cluster '%s': %v\n", cluName, err)
continue
}
registerToEKS(cluName)
case watch.Deleted:
fmt.Printf("Detected deleted kubeconfig secret %s\n", sec.Name)
deregisterFromEKS(cluName)
}
}
}
}
func registerToEKS(clusterName string) {
provider := os.Getenv("CLUSTER_PROVIDER")
if provider == "" {
provider = "EKS_ANYWHERE"
}
region := os.Getenv("AWS_DEFAULT_REGION")
role := os.Getenv("AWS_EKS_CONNECTOR_ROLE_ARN")
adminARNs := os.Getenv("AWS_EKS_ADMIN_ARNS")
cmd := exec.Command("eksctl", "get", "cluster", "--name", clusterName, "--region", region)
_, err := cmd.Output()
if err == nil {
fmt.Printf("cluster '%s' already registered\n", clusterName)
return
}
cmd = exec.Command("eksctl", "register", "cluster", "--name", clusterName, "--provider", provider, "--region", region, "--role-arn", role)
_, err = cmd.Output()
if err != nil {
fmt.Printf("failed to register cluster '%s': %v\n", clusterName, err)
}
crb := crbTemplateHead
for _, i := range strings.Split(adminARNs, ",") {
crb += fmt.Sprintf(crbTemplateUser, i)
cm := exec.Command("echo", "' - \""+i+"\"'", ">>", "eks-connector-clusterrole.yaml")
_, _ = cm.Output()
}
crb += crbTemplateFoot
err = os.WriteFile(clusterName+"-rbac.yaml", []byte(crb), 0644)
if err != nil {
fmt.Printf("failed to create custom rbac file for cluster '%s': %v\n", clusterName, err)
}
retries := 1
for {
cmd = exec.Command("kubectl", "--kubeconfig", clusterName, "apply", "-f", "eks-connector.yaml,eks-connector-clusterrole.yaml,eks-connector-console-dashboard-full-access-group.yaml,"+clusterName+"-rbac.yaml")
_, err = cmd.Output()
if err != nil {
fmt.Printf("failed to apply registration manifests in cluster '%s': %v, Retrying...\n", clusterName, err)
time.Sleep(3 * time.Second)
retries += 1
if retries > 3 {
fmt.Printf("failed to apply registration manifests in cluster '%s': %v, Aborting...\n", clusterName, err)
return
}
continue
}
break
}
fmt.Printf("cluster '%s' registered successfully\n", clusterName)
}
func deregisterFromEKS(clusterName string) {
region := os.Getenv("AWS_DEFAULT_REGION")
cmd := exec.Command("eksctl", "get", "cluster", "--name", clusterName, "--region", region)
_, err := cmd.Output()
if err != nil && strings.Contains(err.Error(), "404") {
fmt.Printf("cluster '%s' already deregistered\n", clusterName)
return
}
cmd = exec.Command("eksctl", "deregister", "cluster", "--name", clusterName, "--region", region)
_, err = cmd.Output()
if err != nil {
fmt.Printf("failed to deregister cluster '%s': %v\n", clusterName, err)
}
fmt.Printf("cluster '%s' deregistered successfully\n", clusterName)
}