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signature_import_controller.go
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/
signature_import_controller.go
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package signature
import (
"context"
"fmt"
"time"
"github.com/golang/glog"
utilruntime "k8s.io/apimachinery/pkg/util/runtime"
"k8s.io/apimachinery/pkg/util/wait"
"k8s.io/client-go/tools/cache"
"k8s.io/client-go/util/workqueue"
kapi "k8s.io/kubernetes/pkg/api"
"k8s.io/kubernetes/pkg/controller"
imageapi "github.com/openshift/origin/pkg/image/apis/image"
informers "github.com/openshift/origin/pkg/image/generated/informers/internalversion/image/internalversion"
imageclient "github.com/openshift/origin/pkg/image/generated/internalclientset"
imagelister "github.com/openshift/origin/pkg/image/generated/listers/image/internalversion"
)
const (
// SignatureManagedAnnotation marks signatures that were imported by this
// controller.
SignatureManagedAnnotation = "image.openshift.io/managed-signature"
)
type SignatureDownloader interface {
DownloadImageSignatures(*imageapi.Image) ([]imageapi.ImageSignature, error)
}
type SignatureImportController struct {
imageClient imageclient.Interface
imageLister imagelister.ImageLister
imageHasSynced cache.InformerSynced
queue workqueue.RateLimitingInterface
// signatureImportLimit limits amount of signatures we will import.
// By default this is set to 3 signatures.
signatureImportLimit int
fetcher SignatureDownloader
}
func NewSignatureImportController(ctx context.Context, imageClient imageclient.Interface, imageInformer informers.ImageInformer, resyncInterval, fetchTimeout time.Duration, limit int) *SignatureImportController {
controller := &SignatureImportController{
queue: workqueue.NewRateLimitingQueue(workqueue.DefaultControllerRateLimiter()),
imageClient: imageClient,
imageLister: imageInformer.Lister(),
imageHasSynced: imageInformer.Informer().HasSynced,
signatureImportLimit: limit,
}
controller.fetcher = NewContainerImageSignatureDownloader(ctx, fetchTimeout)
imageInformer.Informer().AddEventHandlerWithResyncPeriod(cache.ResourceEventHandlerFuncs{
AddFunc: func(obj interface{}) {
image := obj.(*imageapi.Image)
glog.V(4).Infof("Adding image %s", image.Name)
controller.enqueueImage(obj)
},
UpdateFunc: func(old, cur interface{}) {
image := cur.(*imageapi.Image)
glog.V(4).Infof("Updating image %s", image.Name)
controller.enqueueImage(cur)
},
}, resyncInterval)
return controller
}
func (s *SignatureImportController) Run(workers int, stopCh <-chan struct{}) {
defer utilruntime.HandleCrash()
defer s.queue.ShutDown()
if !cache.WaitForCacheSync(stopCh, s.imageHasSynced) {
return
}
glog.V(5).Infof("Starting workers")
for i := 0; i < workers; i++ {
go wait.Until(s.worker, time.Second, stopCh)
}
<-stopCh
glog.V(1).Infof("Shutting down")
}
func (s *SignatureImportController) worker() {
for {
if !s.work() {
return
}
}
}
// work returns true if the worker thread should continue
func (s *SignatureImportController) work() bool {
key, quit := s.queue.Get()
if quit {
return false
}
defer s.queue.Done(key)
err := s.syncImageSignatures(key.(string))
if err != nil {
utilruntime.HandleError(fmt.Errorf("error syncing image %s, it will be retried: %v", key.(string), err))
s.queue.AddRateLimited(key)
return true
}
s.queue.Forget(key)
return true
}
func (s *SignatureImportController) enqueueImage(obj interface{}) {
_, ok := obj.(*imageapi.Image)
if !ok {
return
}
key, err := controller.KeyFunc(obj)
if err != nil {
glog.Errorf("Couldn't get key for object %+v: %v", obj, err)
return
}
s.queue.Add(key)
}
func (s *SignatureImportController) syncImageSignatures(key string) error {
glog.V(4).Infof("Initiating download of signatures for %s", key)
image, err := s.imageLister.Get(key)
if err != nil {
glog.V(4).Infof("Unable to get image %v: %v", key, err)
return err
}
currentSignatures, err := s.fetcher.DownloadImageSignatures(image)
if err != nil {
glog.V(4).Infof("Failed to fetch image %s signatures: %v", image.Name, err)
return err
}
// Having no signatures means no-op (we don't remove stored signatures when
// the sig-store no longer have them).
if len(currentSignatures) == 0 {
glog.V(4).Infof("No signatures dowloaded for %s", image.Name)
return nil
}
t, err := kapi.Scheme.DeepCopy(image)
if err != nil {
return err
}
newImage := t.(*imageapi.Image)
shouldUpdate := false
// Only add new signatures, do not override existing stored signatures as that
// can void their verification status.
for _, c := range currentSignatures {
found := false
for _, s := range newImage.Signatures {
if s.Name == c.Name {
found = true
break
}
}
if !found {
newImage.Signatures = append(newImage.Signatures, c)
shouldUpdate = true
}
}
if len(newImage.Signatures) > s.signatureImportLimit {
glog.V(2).Infof("Image %s reached signature limit (max:%d, want:%d)", newImage.Name, s.signatureImportLimit, len(newImage.Signatures))
return nil
}
// Avoid unnecessary updates to images.
if !shouldUpdate {
return nil
}
glog.V(4).Infof("Image %s now has %d signatures", newImage.Name, len(newImage.Signatures))
_, err = s.imageClient.Image().Images().Update(newImage)
return err
}