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kube.go
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kube.go
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package main
import (
"context"
"fmt"
"io/ioutil"
"os"
"path/filepath"
v1 "k8s.io/apimachinery/pkg/apis/meta/v1"
"k8s.io/apimachinery/pkg/runtime/schema"
"k8s.io/client-go/dynamic"
"k8s.io/client-go/kubernetes"
"k8s.io/client-go/rest"
"k8s.io/client-go/tools/clientcmd"
"sigs.k8s.io/yaml"
)
func loadKubeConfig(kubeconfig string) (*rest.Config, error) {
if kubeconfig != "" {
return clientcmd.BuildConfigFromFlags("", kubeconfig)
}
return rest.InClusterConfig()
}
func getNamespacedObjects(clientset *kubernetes.Clientset) ([]schema.GroupVersionResource, error) {
log.Infoln("Fetching namespaced API resources...")
apiResourceList, err := clientset.Discovery().ServerPreferredResources()
if err != nil {
log.Errorf("Error fetching namespaced API resources: %v", err)
return nil, err
}
log.Debugln("API Resources: ", apiResourceList)
objects := make([]schema.GroupVersionResource, 0)
for _, apiResources := range apiResourceList {
gv, _ := schema.ParseGroupVersion(apiResources.GroupVersion)
for _, apiResource := range apiResources.APIResources {
if apiResource.Namespaced {
objects = append(objects, gv.WithResource(apiResource.Name))
}
}
}
log.Debugln("Namespaced Objects: ", objects)
return objects, nil
}
func getNamespaces(clientset *kubernetes.Clientset) ([]string, error) {
namespaceList, err := clientset.CoreV1().Namespaces().List(context.Background(), v1.ListOptions{})
if err != nil {
return nil, err
}
namespaces := make([]string, len(namespaceList.Items))
for i, namespace := range namespaceList.Items {
namespaces[i] = namespace.GetName()
}
return namespaces, nil
}
func processNamespace(clientset *kubernetes.Clientset, config *rest.Config, objects []schema.GroupVersionResource, namespace string, outputDir string) {
log.Infof("Processing namespace: %s", namespace)
namespaceDir := filepath.Join(outputDir, "namespace-scoped", namespace)
os.MkdirAll(namespaceDir, 0755)
dynamicClient := dynamic.NewForConfigOrDie(config)
log.Debugln("Dynamic Client: ", dynamicClient)
for _, object := range objects {
objectDir := filepath.Join(namespaceDir, object.Resource)
os.MkdirAll(objectDir, 0755)
fmt.Printf("Object: %s\n", object.Resource)
unstructuredList, err := dynamicClient.Resource(object).Namespace(namespace).List(context.Background(), v1.ListOptions{})
if err != nil {
log.Warnf("Error while listing objects for resource '%s' in namespace '%s': %v", object.Resource, namespace, err)
continue
}
for _, item := range unstructuredList.Items {
itemBytes, err := item.MarshalJSON()
if err != nil {
fmt.Println("Error:", err)
os.Exit(1)
}
itemYaml, err := yaml.JSONToYAML(itemBytes)
if err != nil {
fmt.Println("Error:", err)
os.Exit(1)
}
itemFile := filepath.Join(objectDir, fmt.Sprintf("%s.yaml", item.GetName()))
err = ioutil.WriteFile(itemFile, itemYaml, 0644)
if err != nil {
fmt.Println("Error:", err)
os.Exit(1)
}
// Increment the counters for specific object types
switch object.Resource {
case "pods":
objectCount.WithLabelValues("pods").Inc()
case "deployments":
objectCount.WithLabelValues("deployments").Inc()
case "statefulsets":
objectCount.WithLabelValues("statefulsets").Inc()
case "secrets":
objectCount.WithLabelValues("secrets").Inc()
case "configmaps":
objectCount.WithLabelValues("configmaps").Inc()
}
}
}
}
func processClusterScopedObjects(clientset *kubernetes.Clientset, config *rest.Config, outputDir string) {
log.Infoln("Processing cluster-scoped objects...")
clusterDir := filepath.Join(outputDir, "cluster-scoped")
os.MkdirAll(clusterDir, 0755)
apiResourceList, err := clientset.Discovery().ServerPreferredResources()
if err != nil {
fmt.Println("Error:", err)
os.Exit(1)
}
dynamicClient := dynamic.NewForConfigOrDie(config)
for _, apiResources := range apiResourceList {
gv, _ := schema.ParseGroupVersion(apiResources.GroupVersion)
for _, apiResource := range apiResources.APIResources {
if !apiResource.Namespaced {
clusterObjectDir := filepath.Join(clusterDir, apiResource.Name)
os.MkdirAll(clusterObjectDir, 0755)
fmt.Printf("Cluster Object: %s\n", apiResource.Name)
object := gv.WithResource(apiResource.Name)
unstructuredList, err := dynamicClient.Resource(object).List(context.Background(), v1.ListOptions{})
if err != nil {
fmt.Println("Error:", err)
os.Exit(1)
}
for _, item := range unstructuredList.Items {
itemBytes, err := item.MarshalJSON()
if err != nil {
fmt.Println("Error:", err)
os.Exit(1)
}
itemYaml, err := yaml.JSONToYAML(itemBytes)
if err != nil {
fmt.Println("Error:", err)
os.Exit(1)
}
itemFile := filepath.Join(clusterObjectDir, fmt.Sprintf("%s.yaml", item.GetName()))
err = ioutil.WriteFile(itemFile, itemYaml, 0644)
if err != nil {
fmt.Println("Error:", err)
os.Exit(1)
}
}
}
}
}
}