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controller.go
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controller.go
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package main
import (
"context"
"log"
"k8s.io/apimachinery/pkg/labels"
"k8s.io/apimachinery/pkg/util/runtime"
"k8s.io/apimachinery/pkg/util/sets"
informersCoreV1 "k8s.io/client-go/informers/core/v1"
"k8s.io/client-go/kubernetes"
typedCoreV1 "k8s.io/client-go/kubernetes/typed/core/v1"
listerCoreV1 "k8s.io/client-go/listers/core/v1"
"k8s.io/client-go/tools/cache"
coreV1 "k8s.io/api/core/v1"
apierrors "k8s.io/apimachinery/pkg/api/errors"
metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
)
const (
// SecretSyncType is the type of secrets we are watching...
SecretSyncType = "bensooraj.com/secretsync"
// SecretSyncAnnotation ...
SecretSyncAnnotation = "bensooraj.com/secretsync"
// SecretSyncSourceNamespace is the namespace we are watching
SecretSyncSourceNamespace = "secretsync"
)
var namepaceBlacklist = map[string]bool{
"kube-node-lease": true,
"kube-public": true,
"kube-system": true,
"local-path-storage": true,
SecretSyncSourceNamespace: true,
}
// NSFPController is an implementation of the Not Safe For Production dummy
// kubernetes controller that I am going to build for the sake of practise!
type NSFPController struct {
// Secrets
SecretGetter typedCoreV1.SecretsGetter
SecretLister listerCoreV1.SecretLister
SecretInformerSynced cache.InformerSynced
// Namespaces
NamespaceGetter typedCoreV1.NamespacesGetter
NamespaceLister listerCoreV1.NamespaceLister
NamespaceInformerSynced cache.InformerSynced
}
// NewNSFPController returns a new instance of the controller we are building!
func NewNSFPController(
k8sClientset *kubernetes.Clientset,
secretInformer informersCoreV1.SecretInformer,
namespaceInformer informersCoreV1.NamespaceInformer,
) *NSFPController {
nsfpController := &NSFPController{
// Secrets
SecretGetter: k8sClientset.CoreV1(),
SecretLister: secretInformer.Lister(),
SecretInformerSynced: secretInformer.Informer().HasSynced,
// Namespaces
NamespaceGetter: k8sClientset.CoreV1(),
NamespaceLister: namespaceInformer.Lister(),
NamespaceInformerSynced: namespaceInformer.Informer().HasSynced,
}
// Configure event handlers for secret events
secretInformer.Informer().AddEventHandler(cache.ResourceEventHandlerFuncs{
AddFunc: func(obj interface{}) { nsfpController.OnAdd(obj) },
UpdateFunc: func(oldObj, newObj interface{}) { nsfpController.OnUdpate(oldObj, newObj) },
DeleteFunc: func(obj interface{}) { nsfpController.OnDelete(obj) },
})
return nsfpController
}
// Run starts the controller!
func (nsfpc *NSFPController) Run(stopChannel <-chan struct{}) {
if !cache.WaitForCacheSync(stopChannel, nsfpc.SecretInformerSynced, nsfpc.NamespaceInformerSynced) {
log.Println("Timeout while waiting for cache to populate!")
return
}
log.Println("Caches synced...")
nsfpc.doSync()
// Wait until the stop signal is received
log.Println("Waiting for stop signal.")
// <-stopChannel
log.Println("Received stop signal.")
}
// OnAdd handles secret addition events
func (nsfpc *NSFPController) OnAdd(obj interface{}) {
secret := obj.(*coreV1.Secret)
key, err := cache.MetaNamespaceKeyFunc(obj)
if err != nil {
log.Printf("[ADD ERROR] Error getting key for %#v: %v\n", obj, err)
runtime.HandleError(err)
}
log.Printf("[ADD] %v | %s in the namepace %s\n", key, secret.Name, secret.Namespace)
// nsfpc.HandleSecretChange(obj)
}
// OnUdpate handles secret updation events
func (nsfpc *NSFPController) OnUdpate(oldObj, newObj interface{}) {
secret := oldObj.(*coreV1.Secret)
key, err := cache.MetaNamespaceKeyFunc(oldObj)
if err != nil {
log.Printf("[UPDATE ERROR] Error getting key for %#v: %v\n", oldObj, err)
runtime.HandleError(err)
}
log.Printf("[UPDATE] %v | %s in the namepace %s\n", key, secret.Name, secret.Namespace)
// nsfpc.HandleSecretChange(newObj)
}
// OnDelete handles secret deletion events
func (nsfpc *NSFPController) OnDelete(obj interface{}) {
secret := obj.(*coreV1.Secret)
key, err := cache.MetaNamespaceKeyFunc(obj)
if err != nil {
log.Printf("[DELETE ERROR] Error getting key for %#v: %v\n", obj, err)
runtime.HandleError(err)
}
log.Printf("[DELETE] %v | %s in the namepace %s\n", key, secret.Name, secret.Namespace)
// nsfpc.HandleSecretChange(obj)
}
// HandleSecretChange handles changes to a secret of the type and in the namespace we are watching
// func (nsfpc *NSFPController) HandleSecretChange(obj interface{}) {
// secret, ok := obj.(*coreV1.Secret)
// if !ok {
// // TODO::DeletedFinalStateUnknown
// return
// }
// if secret.ObjectMeta.Namespace != SecretSyncSourceNamespace {
// log.Printf("Skipping secret %s in the wrong namespace %s\n", secret.Name, secret.ObjectMeta.Namespace)
// return
// }
// if secret.Type != SecretSyncType {
// log.Printf("Skipping secret %s of the wrong type %s\n", secret.Name, secret.Type)
// return
// }
// // List the namespaces
// nss, err := nsfpc.NamespaceLister.List(labels.Everything())
// if err != nil {
// log.Printf("Error listing namespaces: %v", err)
// return
// }
// for _, ns := range nss {
// nsName := ns.ObjectMeta.Name
// if _, ok := namepaceBlacklist[nsName]; ok {
// log.Printf("Skipping the namespace %s\n", nsName)
// continue
// }
// log.Printf("Copy the secret %s over to the namespace %s\n", secret.ObjectMeta.Name, ns.ObjectMeta.Name)
// // nsfpc.copySecretToNamespace(secret, nsName)
// }
// }
func (nsfpc *NSFPController) doSync() {
sourceSecrets, err := nsfpc.SecretLister.Secrets(SecretSyncSourceNamespace).List(labels.Everything())
if err != nil {
log.Panicf("Listing secrets... Oh noes!: %v\n", err)
runtime.HandleError(err)
}
var filteredSecrets []*coreV1.Secret
for _, secret := range sourceSecrets {
if annotation, found := secret.Annotations["bensooraj.com/secretsync"]; found && annotation == "true" {
log.Printf("RELEVANT\n")
log.Printf("Syncing secret %s/%s\n", secret.Namespace, secret.Name)
filteredSecrets = append(filteredSecrets, secret)
}
}
log.Printf("filteredSecrets: %+v\n", filteredSecrets)
rawNamepaces, err := nsfpc.NamespaceLister.List(labels.Everything())
if err != nil {
log.Panicf("Listing namespaces... Oh noes!: %v\n", err)
runtime.HandleError(err)
}
var destinationNamepaces []*coreV1.Namespace
for _, ns := range rawNamepaces {
if annotation, found := ns.Annotations["bensooraj.com/secretsync"]; found && annotation == "true" {
destinationNamepaces = append(destinationNamepaces, ns)
}
}
for _, ns := range destinationNamepaces {
log.Printf("Destination namespace %s\n", ns.Name)
nsfpc.syncNamespace(filteredSecrets, ns.Name)
}
}
func (nsfpc *NSFPController) getSecretsInNamespace(nsName string) ([]*coreV1.Secret, error) {
var secrets []*coreV1.Secret
allSecrets, err := nsfpc.SecretLister.Secrets(nsName).List(labels.Everything())
if err != nil {
log.Printf("Listing secrets... Oh noes!: %v\n", err)
return secrets, err
}
for _, secret := range allSecrets {
if annotation, found := secret.Annotations["bensooraj.com/secretsync"]; found && annotation == "true" {
secrets = append(secrets, secret)
}
}
return secrets, nil
}
func (nsfpc *NSFPController) syncNamespace(secrets []*coreV1.Secret, nsName string) {
ctx := context.Background()
// TODO:
// 2. Delete secrets that have the annotation but are not in the filtered list of secrets
// 1. Create/Update all of the secrets in this namespace
for _, secret := range secrets {
newSecret := secret.DeepCopy()
newSecret.Namespace = nsName
newSecret.ResourceVersion = "" // resourceVersion should not be set on objects to be created
newSecret.UID = "" // Precondition failed: UID in precondition
log.Printf("New secret copied over: %v\n", newSecret)
// Create
_, err := nsfpc.SecretGetter.Secrets(nsName).Create(ctx, newSecret, metav1.CreateOptions{})
if err != nil {
if apierrors.IsAlreadyExists(err) {
log.Printf("ALREADY EXISTS: %+v\n", err)
// Update if the secret already exists
_, updateErr := nsfpc.SecretGetter.Secrets(nsName).Update(ctx, newSecret, metav1.UpdateOptions{})
if updateErr != nil {
log.Printf("Error updating %s/%s: %+v\n", newSecret.Namespace, newSecret.Name, updateErr)
}
} else {
log.Printf("Error creating the new secret: %+v\n", err)
}
}
}
// 2. Delete secrets that have the annotation but are not in the filtered list of secrets
sourceSecrets := sets.String{}
targetSecrets := sets.String{}
for _, secret := range secrets {
sourceSecrets.Insert(secret.Name)
}
log.Println("sourceSecrets: ", sourceSecrets)
targetSecretList, err := nsfpc.getSecretsInNamespace(nsName)
if err != nil {
log.Printf("Error listing target secrets for deletion: %+v\n", err)
}
for _, secret := range targetSecretList {
targetSecrets.Insert(secret.Name)
}
log.Println("targetSecrets: ", targetSecrets)
deleteSecretSet := targetSecrets.Difference(sourceSecrets)
for _, secretName := range deleteSecretSet.UnsortedList() {
log.Printf("Delete secret %s/%s\n", nsName, secretName)
deleteErr := nsfpc.SecretGetter.Secrets(nsName).Delete(ctx, secretName, metav1.DeleteOptions{})
if deleteErr != nil {
log.Printf("Error deleteing secret %s/%s: %+v\n", nsName, secretName, deleteErr)
}
}
}