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main.go
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main.go
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package main
import (
"context"
"flag"
"fmt"
"os"
"regexp"
"strconv"
"time"
"istio.io/pkg/log"
metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
"k8s.io/client-go/kubernetes"
"k8s.io/client-go/rest"
"k8s.io/client-go/tools/clientcmd"
)
var (
kubeconfig string
dryRun bool
annotationKey string
systemNamespaces = []string{
"default",
"kube-system",
"flux-system",
}
)
func isSystemNamespace(name string) bool {
for _, ns := range systemNamespaces {
if name == ns {
return true
}
}
return false
}
func main() {
options := log.DefaultOptions()
options.JSONEncoding = true
if err := log.Configure(options); err != nil {
fmt.Printf("{\"message\": \"unable to start logging system\", \"error\": \"%s\"}\n", err)
os.Exit(1)
}
flag.StringVar(&kubeconfig, "kubeconfig", "", "Path to the kubeconfig file (optional)")
flag.BoolVar(&dryRun, "dry-run", false, "Enable dry run mode")
flag.Parse()
annotationKey = os.Getenv("KUBE_ANNOTATION_KEY")
config, err := loadKubeConfig()
if err != nil {
log.Errorf("Error loading kubeconfig",
"error", err,
)
os.Exit(1)
}
clientset, err := kubernetes.NewForConfig(config)
if err != nil {
log.Errorf("Error creating Kubernetes client",
"error", err,
)
os.Exit(1)
}
for {
if err := cleanupNamespaces(clientset); err != nil {
log.Warnf("Error cleaning up namespaces",
"error", err,
)
}
// Sleep for an hour before running again
time.Sleep(time.Hour)
}
}
func loadKubeConfig() (*rest.Config, error) {
if kubeconfig != "" {
return clientcmd.BuildConfigFromFlags("", kubeconfig)
}
return rest.InClusterConfig()
}
func cleanupNamespaces(clientset kubernetes.Interface) error {
namespacesRegexStr := os.Getenv("NAMESPACES_REGEX")
var namespacesRegex *regexp.Regexp
if namespacesRegexStr != "" {
var err error
namespacesRegex, err = regexp.Compile(namespacesRegexStr)
if err != nil {
return fmt.Errorf("invalid NAMESPACES_REGEX: %v", err)
}
}
namespaces, err := clientset.CoreV1().Namespaces().List(context.TODO(), metav1.ListOptions{})
if err != nil {
return err
}
currentTimestamp := time.Now().Unix()
for _, ns := range namespaces.Items {
if isSystemNamespace(ns.Name) {
log.Warnf("Skipping system namespace",
"namespace", ns.Name,
)
continue
}
if namespacesRegex != nil && !namespacesRegex.MatchString(ns.Name) {
log.Warnf("Skipping namespace that does not match configured regular expression",
"namespace", ns.Name,
)
continue
}
annotations := ns.Annotations
expiryTimestampStr := annotations[annotationKey]
if expiryTimestampStr == "" {
continue
}
expiryTimestamp, err := strconv.ParseInt(expiryTimestampStr, 10, 64)
if err != nil {
log.Warnf("Error parsing expiry timestamp in namespace",
"err", err,
"namespace", ns.Name,
)
continue
}
if expiryTimestamp > currentTimestamp {
continue
}
if dryRun {
log.Infof("(DRY-RUN) Namespace marked for deletion",
"namespace", ns.Name,
)
continue
}
err = clientset.CoreV1().Namespaces().Delete(context.TODO(), ns.Name, metav1.DeleteOptions{})
if err != nil {
log.Errorf("Error deleting namespace",
"err", err,
"namespace", ns.Name,
)
continue
}
log.Infof("Namespace deleted successfully",
"namespace", ns.Name,
)
}
return nil
}