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kubernetes.go
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kubernetes.go
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package main
import (
"context"
"encoding/json"
"fmt"
"log"
"math/rand"
"os"
"path/filepath"
"time"
v1 "k8s.io/api/core/v1"
metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
"k8s.io/client-go/kubernetes"
"k8s.io/client-go/rest"
"k8s.io/client-go/tools/clientcmd"
"k8s.io/client-go/util/homedir"
)
var resourceInfoQueue = make(chan ResourceInfo, 100)
func fetchResources() {
for {
resourceInfo, err := getRandomResourceInfo()
if err != nil {
log.Printf("Error fetching resource info: %s\n", err)
} else {
resourceInfoQueue <- resourceInfo
}
time.Sleep(1 * time.Second)
}
}
type KubernetesResource interface {
List(ctx context.Context, namespace string, opts metav1.ListOptions) ([]ResourceInfo, error)
Delete(ctx context.Context, namespace, name string) error
}
// Resource types supported
// Pods
// ReplicaSets
// Deployments
// StatefulSets
// Services
// DaemonSets
// Secrets
// ConfigMaps
// Jobs
// CronJobs
// Ingresses
type PodResource struct {
clientset *kubernetes.Clientset
}
type ReplicaSetResource struct {
clientset *kubernetes.Clientset
}
type DeploymentResource struct {
clientset *kubernetes.Clientset
}
type StatefulSetResource struct {
clientset *kubernetes.Clientset
}
type ServiceResource struct {
clientset *kubernetes.Clientset
}
type DaemonSetResource struct {
clientset *kubernetes.Clientset
}
type SecretResource struct {
clientset *kubernetes.Clientset
}
type ConfigMapResource struct {
clientset *kubernetes.Clientset
}
type JobResource struct {
clientset *kubernetes.Clientset
}
type CronJobResource struct {
clientset *kubernetes.Clientset
}
type IngressResource struct {
clientset *kubernetes.Clientset
}
type ResourceInfo struct {
Name string
Namespace string
Type string
}
func (p *PodResource) List(ctx context.Context, namespace string, opts metav1.ListOptions) ([]ResourceInfo, error) {
pods, err := p.clientset.CoreV1().Pods(namespace).List(ctx, opts)
if err != nil {
return nil, err
}
var results []ResourceInfo
for _, pod := range pods.Items {
if !isCriticalPod(pod) {
results = append(results, ResourceInfo{Name: pod.Name, Namespace: pod.Namespace, Type: "pod"})
}
}
return results, nil
}
func (r *ReplicaSetResource) List(ctx context.Context, namespace string, opts metav1.ListOptions) ([]ResourceInfo, error) {
replicasets, err := r.clientset.AppsV1().ReplicaSets(namespace).List(ctx, opts)
if err != nil {
return nil, err
}
var results []ResourceInfo
for _, rs := range replicasets.Items {
results = append(results, ResourceInfo{Name: rs.Name, Namespace: rs.Namespace, Type: "replicaset"})
}
return results, nil
}
func (d *DeploymentResource) List(ctx context.Context, namespace string, opts metav1.ListOptions) ([]ResourceInfo, error) {
deployments, err := d.clientset.AppsV1().Deployments(namespace).List(ctx, opts)
if err != nil {
return nil, err
}
var results []ResourceInfo
for _, deployment := range deployments.Items {
results = append(results, ResourceInfo{Name: deployment.Name, Namespace: deployment.Namespace, Type: "deployment"})
}
return results, nil
}
func (s *StatefulSetResource) List(ctx context.Context, namespace string, opts metav1.ListOptions) ([]ResourceInfo, error) {
statefulSets, err := s.clientset.AppsV1().StatefulSets(namespace).List(ctx, opts)
if err != nil {
return nil, err
}
var results []ResourceInfo
for _, ss := range statefulSets.Items {
results = append(results, ResourceInfo{Name: ss.Name, Namespace: ss.Namespace, Type: "statefulset"})
}
return results, nil
}
func (s *ServiceResource) List(ctx context.Context, namespace string, opts metav1.ListOptions) ([]ResourceInfo, error) {
services, err := s.clientset.CoreV1().Services(namespace).List(ctx, opts)
if err != nil {
return nil, err
}
var results []ResourceInfo
for _, svc := range services.Items {
results = append(results, ResourceInfo{Name: svc.Name, Namespace: svc.Namespace, Type: "service"})
}
return results, nil
}
func (d *DaemonSetResource) List(ctx context.Context, namespace string, opts metav1.ListOptions) ([]ResourceInfo, error) {
daemonSets, err := d.clientset.AppsV1().DaemonSets(namespace).List(ctx, opts)
if err != nil {
return nil, err
}
var results []ResourceInfo
for _, ds := range daemonSets.Items {
results = append(results, ResourceInfo{Name: ds.Name, Namespace: ds.Namespace, Type: "daemonset"})
}
return results, nil
}
func (s *SecretResource) List(ctx context.Context, namespace string, opts metav1.ListOptions) ([]ResourceInfo, error) {
secrets, err := s.clientset.CoreV1().Secrets(namespace).List(ctx, opts)
if err != nil {
return nil, err
}
var results []ResourceInfo
for _, secret := range secrets.Items {
results = append(results, ResourceInfo{Name: secret.Name, Namespace: secret.Namespace, Type: "secret"})
}
return results, nil
}
func (c *ConfigMapResource) List(ctx context.Context, namespace string, opts metav1.ListOptions) ([]ResourceInfo, error) {
configMaps, err := c.clientset.CoreV1().ConfigMaps(namespace).List(ctx, opts)
if err != nil {
return nil, err
}
var results []ResourceInfo
for _, cm := range configMaps.Items {
results = append(results, ResourceInfo{Name: cm.Name, Namespace: cm.Namespace, Type: "configmap"})
}
return results, nil
}
func (j *JobResource) List(ctx context.Context, namespace string, opts metav1.ListOptions) ([]ResourceInfo, error) {
jobs, err := j.clientset.BatchV1().Jobs(namespace).List(ctx, opts)
if err != nil {
return nil, err
}
var results []ResourceInfo
for _, job := range jobs.Items {
results = append(results, ResourceInfo{Name: job.Name, Namespace: job.Namespace, Type: "job"})
}
return results, nil
}
func (c *CronJobResource) List(ctx context.Context, namespace string, opts metav1.ListOptions) ([]ResourceInfo, error) {
cronJobs, err := c.clientset.BatchV1beta1().CronJobs(namespace).List(ctx, opts)
if err != nil {
return nil, err
}
var results []ResourceInfo
for _, cj := range cronJobs.Items {
results = append(results, ResourceInfo{Name: cj.Name, Namespace: cj.Namespace, Type: "cronjob"})
}
return results, nil
}
func (i *IngressResource) List(ctx context.Context, namespace string, opts metav1.ListOptions) ([]ResourceInfo, error) {
ingresses, err := i.clientset.NetworkingV1().Ingresses(namespace).List(ctx, opts)
if err != nil {
return nil, err
}
var results []ResourceInfo
for _, ing := range ingresses.Items {
results = append(results, ResourceInfo{Name: ing.Name, Namespace: ing.Namespace, Type: "ingress"})
}
return results, nil
}
func (p *PodResource) Delete(ctx context.Context, namespace, name string) error {
return p.clientset.CoreV1().Pods(namespace).Delete(ctx, name, metav1.DeleteOptions{})
}
func (r *ReplicaSetResource) Delete(ctx context.Context, namespace, name string) error {
return r.clientset.AppsV1().ReplicaSets(namespace).Delete(ctx, name, metav1.DeleteOptions{})
}
func (d *DeploymentResource) Delete(ctx context.Context, namespace, name string) error {
return d.clientset.AppsV1().Deployments(namespace).Delete(ctx, name, metav1.DeleteOptions{})
}
func (s *StatefulSetResource) Delete(ctx context.Context, namespace, name string) error {
return s.clientset.AppsV1().StatefulSets(namespace).Delete(ctx, name, metav1.DeleteOptions{})
}
func (s *ServiceResource) Delete(ctx context.Context, namespace, name string) error {
return s.clientset.CoreV1().Services(namespace).Delete(ctx, name, metav1.DeleteOptions{})
}
func (d *DaemonSetResource) Delete(ctx context.Context, namespace, name string) error {
return d.clientset.AppsV1().DaemonSets(namespace).Delete(ctx, name, metav1.DeleteOptions{})
}
func (s *SecretResource) Delete(ctx context.Context, namespace, name string) error {
return s.clientset.CoreV1().Secrets(namespace).Delete(ctx, name, metav1.DeleteOptions{})
}
func (c *ConfigMapResource) Delete(ctx context.Context, namespace, name string) error {
return c.clientset.CoreV1().ConfigMaps(namespace).Delete(ctx, name, metav1.DeleteOptions{})
}
func (j *JobResource) Delete(ctx context.Context, namespace, name string) error {
return j.clientset.BatchV1().Jobs(namespace).Delete(ctx, name, metav1.DeleteOptions{})
}
func (c *CronJobResource) Delete(ctx context.Context, namespace, name string) error {
return c.clientset.BatchV1beta1().CronJobs(namespace).Delete(ctx, name, metav1.DeleteOptions{})
}
func (i *IngressResource) Delete(ctx context.Context, namespace, name string) error {
return i.clientset.NetworkingV1().Ingresses(namespace).Delete(ctx, name, metav1.DeleteOptions{})
}
type Config struct {
ResourceTypes []string `json:"resource_types"`
Namespaces NamespacesConfig `json:"namespaces"`
}
type NamespacesConfig struct {
Include []string `json:"include"`
Exclude []string `json:"exclude"`
}
var defaultConfig = Config{
ResourceTypes: []string{"pods"},
Namespaces: NamespacesConfig{
Include: []string{},
Exclude: []string{"kube-system"},
},
}
var gameConfig Config
func setDefaultConfig() {
gameConfig = defaultConfig
}
func loadConfigFromFile(filename string) error {
data, err := os.ReadFile(filename)
if err != nil {
return err
}
err = json.Unmarshal(data, &gameConfig)
if err != nil {
return err
}
return nil
}
func getAllNamespaces() ([]string, error) {
allNamespaces, err := clientset.CoreV1().Namespaces().List(context.TODO(), metav1.ListOptions{})
if err != nil {
return nil, err
}
var filteredNamespaces []string
for _, ns := range allNamespaces.Items {
if (len(gameConfig.Namespaces.Include) == 0 || contains(gameConfig.Namespaces.Include, ns.Name)) &&
!contains(gameConfig.Namespaces.Exclude, ns.Name) {
filteredNamespaces = append(filteredNamespaces, ns.Name)
}
}
return filteredNamespaces, nil
}
func contains(slice []string, str string) bool {
for _, v := range slice {
if v == str {
return true
}
}
return false
}
func getResourceHandler(resourceType string) (KubernetesResource, error) {
switch resourceType {
case "pods":
return &PodResource{clientset: clientset}, nil
case "replicasets":
return &ReplicaSetResource{clientset: clientset}, nil
case "deployments":
return &DeploymentResource{clientset: clientset}, nil
case "statefulsets":
return &StatefulSetResource{clientset: clientset}, nil
case "services":
return &ServiceResource{clientset: clientset}, nil
case "daemonsets":
return &DaemonSetResource{clientset: clientset}, nil
case "secrets":
return &SecretResource{clientset: clientset}, nil
case "configmaps":
return &ConfigMapResource{clientset: clientset}, nil
case "jobs":
return &JobResource{clientset: clientset}, nil
case "cronjobs":
return &CronJobResource{clientset: clientset}, nil
case "ingresses":
return &IngressResource{clientset: clientset}, nil
default:
return nil, fmt.Errorf("unsupported resource type: %s", resourceType)
}
}
type PodInfo struct {
Name string
Namespace string
}
var clientset *kubernetes.Clientset
func initKubeClient() {
var kubeconfig string
if kc := os.Getenv("KUBECONFIG"); kc != "" {
kubeconfig = kc
} else {
home := homedir.HomeDir()
kubeconfig = filepath.Join(home, ".kube", "config")
}
config, err := clientcmd.BuildConfigFromFlags("", kubeconfig)
if err != nil {
log.Printf("Error building kubeconfig: %s\n", err.Error())
config, err = rest.InClusterConfig()
if err != nil {
log.Fatalf("Error building kube config: %s\n", err.Error())
}
}
clientset, err = kubernetes.NewForConfig(config)
if err != nil {
log.Fatalf("Error creating clientset: %s\n", err.Error())
}
}
func getRandomResourceInfo() (ResourceInfo, error) {
if len(gameConfig.ResourceTypes) == 0 {
return ResourceInfo{}, fmt.Errorf("no resource types configured")
}
var allResources []ResourceInfo
for _, resourceType := range gameConfig.ResourceTypes {
handler, err := getResourceHandler(resourceType)
if err != nil {
log.Printf("Error getting handler for resource type %s: %s\n", resourceType, err)
continue
}
filteredNamespaces, err := getAllNamespaces()
if err != nil {
log.Printf("Error fetching namespaces: %s\n", err)
continue
}
for _, ns := range filteredNamespaces {
resources, err := handler.List(context.TODO(), ns, metav1.ListOptions{})
if err != nil {
log.Printf("Error listing resources in namespace %s: %s\n", ns, err)
continue
}
allResources = append(allResources, resources...)
}
}
if len(allResources) == 0 {
log.Println("No eligible resources found.")
return ResourceInfo{}, fmt.Errorf("no eligible resources found")
}
randIndex := rand.Intn(len(allResources))
return allResources[randIndex], nil
}
func isCriticalPod(pod v1.Pod) bool {
_, isCritical := pod.Annotations["scheduler.alpha.kubernetes.io/critical-pod"]
return isCritical
}
func deleteResource(resourceInfo ResourceInfo) {
var err error
switch resourceInfo.Type {
case "pod":
err = clientset.CoreV1().Pods(resourceInfo.Namespace).Delete(context.TODO(), resourceInfo.Name, metav1.DeleteOptions{})
case "replicaset":
err = clientset.AppsV1().ReplicaSets(resourceInfo.Namespace).Delete(context.TODO(), resourceInfo.Name, metav1.DeleteOptions{})
case "deployment":
err = clientset.AppsV1().Deployments(resourceInfo.Namespace).Delete(context.TODO(), resourceInfo.Name, metav1.DeleteOptions{})
default:
log.Printf("Unsupported resource type: %s", resourceInfo.Type)
return
}
if err != nil {
log.Printf("Error deleting %s %s in namespace %s: %s\n", resourceInfo.Type, resourceInfo.Name, resourceInfo.Namespace, err.Error())
} else {
log.Printf("%s deleted: %s in namespace %s\n", resourceInfo.Type, resourceInfo.Name, resourceInfo.Namespace)
}
}