forked from openshift/library-go
/
certsync_controller.go
317 lines (262 loc) · 9.27 KB
/
certsync_controller.go
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package certsyncpod
import (
"fmt"
"io/ioutil"
"os"
"path/filepath"
"reflect"
"time"
apierrors "k8s.io/apimachinery/pkg/api/errors"
metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
utilerrors "k8s.io/apimachinery/pkg/util/errors"
utilruntime "k8s.io/apimachinery/pkg/util/runtime"
"k8s.io/apimachinery/pkg/util/wait"
"k8s.io/client-go/informers"
"k8s.io/client-go/kubernetes"
corev1interface "k8s.io/client-go/kubernetes/typed/core/v1"
"k8s.io/client-go/listers/core/v1"
"k8s.io/client-go/tools/cache"
"k8s.io/client-go/util/workqueue"
"k8s.io/klog"
"github.com/openshift/library-go/pkg/operator/events"
"github.com/openshift/library-go/pkg/operator/staticpod/controller/revision"
)
type CertSyncController struct {
destinationDir string
namespace string
configMaps []revision.RevisionResource
secrets []revision.RevisionResource
configmapGetter corev1interface.ConfigMapInterface
configMapLister v1.ConfigMapLister
secretGetter corev1interface.SecretInterface
secretLister v1.SecretLister
eventRecorder events.Recorder
// queue only ever has one item, but it has nice error handling backoff/retry semantics
queue workqueue.RateLimitingInterface
preRunCaches []cache.InformerSynced
}
func NewCertSyncController(targetDir, targetNamespace string, configmaps, secrets []revision.RevisionResource, kubeClient kubernetes.Interface, informers informers.SharedInformerFactory, eventRecorder events.Recorder) (*CertSyncController, error) {
c := &CertSyncController{
destinationDir: targetDir,
namespace: targetNamespace,
configMaps: configmaps,
secrets: secrets,
eventRecorder: eventRecorder.WithComponentSuffix("cert-sync-controller"),
configmapGetter: kubeClient.CoreV1().ConfigMaps(targetNamespace),
configMapLister: informers.Core().V1().ConfigMaps().Lister(),
secretLister: informers.Core().V1().Secrets().Lister(),
secretGetter: kubeClient.CoreV1().Secrets(targetNamespace),
queue: workqueue.NewNamedRateLimitingQueue(workqueue.DefaultControllerRateLimiter(), "CertSyncController"),
preRunCaches: []cache.InformerSynced{
informers.Core().V1().ConfigMaps().Informer().HasSynced,
informers.Core().V1().Secrets().Informer().HasSynced,
},
}
informers.Core().V1().ConfigMaps().Informer().AddEventHandler(c.eventHandler())
informers.Core().V1().Secrets().Informer().AddEventHandler(c.eventHandler())
return c, nil
}
func getConfigMapDir(targetDir, configMapName string) string {
return filepath.Join(targetDir, "configmaps", configMapName)
}
func getSecretDir(targetDir, secretName string) string {
return filepath.Join(targetDir, "secrets", secretName)
}
func (c *CertSyncController) sync() error {
errors := []error{}
for _, cm := range c.configMaps {
configMap, err := c.configMapLister.ConfigMaps(c.namespace).Get(cm.Name)
switch {
case apierrors.IsNotFound(err) && !cm.Optional:
errors = append(errors, err)
continue
case apierrors.IsNotFound(err) && cm.Optional:
// Check with the live call it is really missing
configMap, err = c.configmapGetter.Get(cm.Name, metav1.GetOptions{})
if err == nil {
klog.Infof("Caches are stale. They don't see configmap '%s/%s', yet it is present", configMap.Namespace, configMap.Name)
// We will get re-queued when we observe the change
continue
}
if !apierrors.IsNotFound(err) {
errors = append(errors, err)
continue
}
// remove missing content
if err := os.RemoveAll(getConfigMapDir(c.destinationDir, cm.Name)); err != nil {
errors = append(errors, err)
}
continue
case err != nil:
errors = append(errors, err)
continue
}
contentDir := getConfigMapDir(c.destinationDir, cm.Name)
data := map[string]string{}
for filename := range configMap.Data {
fullFilename := filepath.Join(contentDir, filename)
existingContent, err := ioutil.ReadFile(fullFilename)
if err != nil {
if !os.IsNotExist(err) {
klog.Error(err)
}
continue
}
data[filename] = string(existingContent)
}
// Check if cached configmap differs
if reflect.DeepEqual(configMap.Data, data) {
continue
}
klog.V(2).Infof("Syncing updated configmap '%s/%s'.", configMap.Namespace, configMap.Name)
// We need to do a live get here so we don't overwrite a newer file with one from a stale cache
configMap, err = c.configmapGetter.Get(configMap.Name, metav1.GetOptions{})
if err != nil {
// Even if the error is not exists we will act on it when caches catch up
errors = append(errors, err)
continue
}
// Check if the live configmap differs
if reflect.DeepEqual(configMap.Data, data) {
klog.Infof("Caches are stale. The live configmap '%s/%s' is reflected on filesystem, but cached one differs", configMap.Namespace, configMap.Name)
continue
}
klog.Infof("Creating directory %q ...", contentDir)
if err := os.MkdirAll(contentDir, 0755); err != nil && !os.IsExist(err) {
errors = append(errors, err)
continue
}
for filename, content := range configMap.Data {
fullFilename := filepath.Join(contentDir, filename)
// if the existing is the same, do nothing
if reflect.DeepEqual(data[fullFilename], content) {
continue
}
klog.Infof("Writing configmap manifest %q ...", fullFilename)
if err := ioutil.WriteFile(fullFilename, []byte(content), 0644); err != nil {
errors = append(errors, err)
continue
}
}
}
for _, s := range c.secrets {
secret, err := c.secretLister.Secrets(c.namespace).Get(s.Name)
switch {
case apierrors.IsNotFound(err) && !s.Optional:
errors = append(errors, err)
continue
case apierrors.IsNotFound(err) && s.Optional:
// Check with the live call it is really missing
secret, err = c.secretGetter.Get(s.Name, metav1.GetOptions{})
if err == nil {
klog.Infof("Caches are stale. They don't see secret '%s/%s', yet it is present", secret.Namespace, secret.Name)
// We will get re-queued when we observe the change
continue
}
if !apierrors.IsNotFound(err) {
errors = append(errors, err)
continue
}
// remove missing content
if err := os.RemoveAll(getSecretDir(c.destinationDir, s.Name)); err != nil {
errors = append(errors, err)
}
continue
case err != nil:
errors = append(errors, err)
continue
}
contentDir := getSecretDir(c.destinationDir, s.Name)
data := map[string][]byte{}
for filename := range secret.Data {
fullFilename := filepath.Join(contentDir, filename)
existingContent, err := ioutil.ReadFile(fullFilename)
if err != nil {
if !os.IsNotExist(err) {
klog.Error(err)
}
continue
}
data[filename] = existingContent
}
// Check if cached secret differs
if reflect.DeepEqual(secret.Data, data) {
continue
}
klog.V(2).Infof("Syncing updated secret '%s/%s'.", secret.Namespace, secret.Name)
// We need to do a live get here so we don't overwrite a newer file with one from a stale cache
secret, err = c.secretGetter.Get(secret.Name, metav1.GetOptions{})
if err != nil {
// Even if the error is not exists we will act on it when caches catch up
errors = append(errors, err)
continue
}
// Check if the live secret differs
if reflect.DeepEqual(secret.Data, data) {
klog.Infof("Caches are stale. The live secret '%s/%s' is reflected on filesystem, but cached one differs", secret.Namespace, secret.Name)
continue
}
klog.Infof("Creating directory %q ...", contentDir)
if err := os.MkdirAll(contentDir, 0755); err != nil && !os.IsExist(err) {
errors = append(errors, err)
continue
}
for filename, content := range secret.Data {
// TODO fix permissions
fullFilename := filepath.Join(contentDir, filename)
// if the existing is the same, do nothing
if reflect.DeepEqual(data[fullFilename], content) {
continue
}
klog.Infof("Writing secret manifest %q ...", fullFilename)
if err := ioutil.WriteFile(fullFilename, content, 0644); err != nil {
errors = append(errors, err)
continue
}
}
}
return utilerrors.NewAggregate(errors)
}
// Run starts the kube-apiserver and blocks until stopCh is closed.
func (c *CertSyncController) Run(workers int, stopCh <-chan struct{}) {
defer utilruntime.HandleCrash()
defer c.queue.ShutDown()
klog.Infof("Starting CertSyncer")
defer klog.Infof("Shutting down CertSyncer")
if !cache.WaitForCacheSync(stopCh, c.preRunCaches...) {
klog.Error("failed waiting for caches")
return
}
klog.V(2).Infof("CertSyncer caches synced")
// doesn't matter what workers say, only start one.
go wait.Until(c.runWorker, time.Second, stopCh)
<-stopCh
}
func (c *CertSyncController) runWorker() {
for c.processNextWorkItem() {
}
}
func (c *CertSyncController) processNextWorkItem() bool {
dsKey, quit := c.queue.Get()
if quit {
return false
}
defer c.queue.Done(dsKey)
err := c.sync()
if err == nil {
c.queue.Forget(dsKey)
return true
}
utilruntime.HandleError(fmt.Errorf("%v failed with : %v", dsKey, err))
c.queue.AddRateLimited(dsKey)
return true
}
const workQueueKey = "key"
// eventHandler queues the operator to check spec and status
func (c *CertSyncController) eventHandler() cache.ResourceEventHandler {
return cache.ResourceEventHandlerFuncs{
AddFunc: func(obj interface{}) { c.queue.Add(workQueueKey) },
UpdateFunc: func(old, new interface{}) { c.queue.Add(workQueueKey) },
DeleteFunc: func(obj interface{}) { c.queue.Add(workQueueKey) },
}
}