forked from kubevirt/containerized-data-importer
/
clone-controller.go
337 lines (276 loc) · 9.98 KB
/
clone-controller.go
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package controller
import (
"crypto/rsa"
"fmt"
"strconv"
"time"
"github.com/pkg/errors"
v1 "k8s.io/api/core/v1"
k8serrors "k8s.io/apimachinery/pkg/api/errors"
metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
coreinformers "k8s.io/client-go/informers/core/v1"
"k8s.io/client-go/kubernetes"
"k8s.io/client-go/kubernetes/scheme"
typedcorev1 "k8s.io/client-go/kubernetes/typed/core/v1"
"k8s.io/client-go/tools/cache"
"k8s.io/client-go/tools/record"
"k8s.io/klog"
"kubevirt.io/containerized-data-importer/pkg/common"
"kubevirt.io/containerized-data-importer/pkg/token"
)
const (
cloneControllerAgentName = "clone-controller"
//AnnCloneRequest sets our expected annotation for a CloneRequest
AnnCloneRequest = "k8s.io/CloneRequest"
//AnnCloneOf is used to indicate that cloning was complete
AnnCloneOf = "k8s.io/CloneOf"
// AnnCloneToken is the annotation containing the clone token
AnnCloneToken = "cdi.kubevirt.io/storage.clone.token"
//CloneUniqueID is used as a special label to be used when we search for the pod
CloneUniqueID = "cdi.kubevirt.io/storage.clone.cloneUniqeId"
// ErrIncompatiblePVC provides a const to indicate a clone is not possible due to an incompatible PVC
ErrIncompatiblePVC = "ErrIncompatiblePVC"
// APIServerPublicKeyDir is the path to the apiserver public key dir
APIServerPublicKeyDir = "/var/run/cdi/apiserver/key"
// APIServerPublicKeyPath is the path to the apiserver public key
APIServerPublicKeyPath = APIServerPublicKeyDir + "/id_rsa.pub"
cloneFinalizerName = "cdi.kubevirt.io/cloneSource"
cloneTokenLeeway = 10 * time.Second
)
// CloneController represents the CDI Clone Controller
type CloneController struct {
Controller
recorder record.EventRecorder
tokenValidator token.Validator
}
// NewCloneController sets up a Clone Controller, and returns a pointer to
// to the newly created Controller
func NewCloneController(client kubernetes.Interface,
pvcInformer coreinformers.PersistentVolumeClaimInformer,
podInformer coreinformers.PodInformer,
image string,
pullPolicy string,
verbose string,
apiServerKey *rsa.PublicKey) *CloneController {
// Create event broadcaster
klog.V(3).Info("Creating event broadcaster")
eventBroadcaster := record.NewBroadcaster()
eventBroadcaster.StartLogging(klog.V(2).Infof)
eventBroadcaster.StartRecordingToSink(&typedcorev1.EventSinkImpl{Interface: client.CoreV1().Events("")})
recorder := eventBroadcaster.NewRecorder(scheme.Scheme, v1.EventSource{Component: cloneControllerAgentName})
c := &CloneController{
Controller: *NewController(client, pvcInformer, podInformer, image, pullPolicy, verbose),
recorder: recorder,
tokenValidator: newCloneTokenValidator(apiServerKey),
}
return c
}
func newCloneTokenValidator(key *rsa.PublicKey) token.Validator {
return token.NewValidator(common.CloneTokenIssuer, key, cloneTokenLeeway)
}
func (cc *CloneController) findCloneSourcePodFromCache(pvc *v1.PersistentVolumeClaim) (*v1.Pod, error) {
var sourcePod *v1.Pod
annCloneRequest := pvc.GetAnnotations()[AnnCloneRequest]
if annCloneRequest != "" {
sourcePvcNamespace, _ := ParseSourcePvcAnnotation(annCloneRequest, "/")
if sourcePvcNamespace == "" {
return nil, errors.Errorf("Bad CloneRequest Annotation")
}
//find the source pod
selector, err := metav1.LabelSelectorAsSelector(&metav1.LabelSelector{
MatchLabels: map[string]string{
CloneUniqueID: string(pvc.GetUID()) + "-source-pod",
},
})
if err != nil {
return nil, err
}
podList, err := cc.podLister.Pods(sourcePvcNamespace).List(selector)
if err != nil {
return nil, err
}
if len(podList) == 0 {
return nil, nil
} else if len(podList) > 1 {
return nil, errors.Errorf("multiple source pods found for clone PVC %s/%s", pvc.Namespace, pvc.Name)
}
sourcePod = podList[0]
}
return sourcePod, nil
}
// Create the cloning source and target pods based the pvc. The pvc is checked (again) to ensure that we are not already
// processing this pvc, which would result in multiple pods for the same pvc.
func (cc *CloneController) processPvcItem(pvc *v1.PersistentVolumeClaim) error {
ready, err := cc.waitTargetPodRunningOrSucceeded(pvc)
if err != nil {
return errors.Wrap(err, "error unsuring target upload pod running")
}
if !ready {
return nil
}
pvcKey, err := cache.MetaNamespaceKeyFunc(pvc)
if err != nil {
return errors.Wrap(err, "error getting pvcKey")
}
// source pod not seen yet
if !cc.podExpectations.SatisfiedExpectations(pvcKey) {
return nil
}
sourcePod, err := cc.findCloneSourcePodFromCache(pvc)
if err != nil {
return errors.Wrap(err, "error getting clone source pod")
}
if sourcePod == nil {
if err = cc.validateSourceAndTarget(pvc); err != nil {
return errors.Wrap(err, "error validating pvc before creating source")
}
crann, err := getCloneRequestPVCAnnotation(pvc)
if err != nil {
return errors.Wrap(err, "error getting clone request annotation")
}
pvc, err = cc.addFinalizer(pvc)
if err != nil {
return errors.Wrap(err, "error adding finalizer")
}
cc.raisePodCreate(pvcKey)
pod, err := CreateCloneSourcePod(cc.clientset, cc.image, cc.pullPolicy, crann, pvc)
if err != nil {
cc.observePodCreate(pvcKey)
return errors.Wrap(err, "error creating clone source pod")
}
klog.V(3).Infof("Created pod %s/%s", pod.Namespace, pod.Name)
}
klog.V(3).Infof("Pod phase for PVC %s/%s is %s", pvc.Namespace, pvc.Name, pvc.Annotations[AnnPodPhase])
if podSucceededFromPVC(pvc) && pvc.Annotations[AnnCloneOf] != "true" {
klog.V(1).Infof("Adding CloneOf annotation to PVC %s/%s", pvc.Namespace, pvc.Name)
pvc.Annotations[AnnCloneOf] = "true"
_, err := cc.clientset.CoreV1().PersistentVolumeClaims(pvc.Namespace).Update(pvc)
if err != nil {
return errors.Wrap(err, "error updating pvc")
}
}
return nil
}
func (cc *CloneController) waitTargetPodRunningOrSucceeded(pvc *v1.PersistentVolumeClaim) (bool, error) {
rs, ok := pvc.Annotations[AnnPodReady]
if !ok {
klog.V(3).Infof("clone target pod for %s/%s not ready", pvc.Namespace, pvc.Name)
return false, nil
}
ready, err := strconv.ParseBool(rs)
if err != nil {
return false, errors.Wrapf(err, "error parsing %s annotation", AnnPodReady)
}
if !ready {
klog.V(3).Infof("clone target pod for %s/%s not ready", pvc.Namespace, pvc.Name)
return podSucceededFromPVC(pvc), nil
}
return true, nil
}
func (cc *CloneController) addFinalizer(pvc *v1.PersistentVolumeClaim) (*v1.PersistentVolumeClaim, error) {
if hasFinalizer(pvc, cloneFinalizerName) {
return pvc, nil
}
cpy := pvc.DeepCopy()
cpy.Finalizers = append(cpy.Finalizers, cloneFinalizerName)
cpy, err := cc.clientset.CoreV1().PersistentVolumeClaims(pvc.Namespace).Update(cpy)
if err != nil {
return pvc, errors.Wrap(err, "error updating PVC")
}
return cpy, nil
}
func (cc *CloneController) removeFinalizer(pvc *v1.PersistentVolumeClaim) (*v1.PersistentVolumeClaim, error) {
if !hasFinalizer(pvc, cloneFinalizerName) {
return pvc, nil
}
var finalizers []string
for _, f := range pvc.Finalizers {
if f != cloneFinalizerName {
finalizers = append(finalizers, f)
}
}
cpy := pvc.DeepCopy()
cpy.Finalizers = finalizers
cpy, err := cc.clientset.CoreV1().PersistentVolumeClaims(pvc.Namespace).Update(cpy)
if err != nil {
return pvc, errors.Wrap(err, "error updating PVC")
}
return cpy, nil
}
func (c *Controller) raisePodCreate(pvcKey string) {
c.podExpectations.ExpectCreations(pvcKey, 1)
}
// Select only pvcs with the 'CloneRequest' annotation and that are not being processed.
// We forget the key unless `processPvcItem` returns an error in which case the key can be
//ProcessNextPvcItem retried.
//ProcessNextPvcItem ...
func (cc *CloneController) ProcessNextPvcItem() bool {
key, shutdown := cc.queue.Get()
if shutdown {
return false
}
defer cc.queue.Done(key)
err := cc.syncPvc(key.(string))
if err != nil { // processPvcItem errors may not have been logged so log here
klog.Errorf("error processing pvc %q: %v", key, err)
return true
}
return cc.forgetKey(key, fmt.Sprintf("ProcessNextPvcItem: processing pvc %q completed", key))
}
func (cc *CloneController) syncPvc(key string) error {
pvc, exists, err := cc.pvcFromKey(key)
if err != nil {
return errors.Wrap(err, "error getting PVC")
} else if !exists {
return nil
}
if !checkPVC(pvc, AnnCloneRequest) || metav1.HasAnnotation(pvc.ObjectMeta, AnnCloneOf) {
cc.cleanup(key, pvc)
return nil
}
klog.V(3).Infof("ProcessNextPvcItem: next pvc to process: \"%s/%s\"\n", pvc.Namespace, pvc.Name)
return cc.processPvcItem(pvc)
}
func (cc *CloneController) cleanup(key string, pvc *v1.PersistentVolumeClaim) error {
klog.V(3).Infof("Cleaning up for PVC %s/%s", pvc.Namespace, pvc.Name)
pod, err := cc.findCloneSourcePodFromCache(pvc)
if err != nil {
return errors.Wrap(err, "error getting clone source pod")
}
if pod != nil && pod.DeletionTimestamp == nil {
if podSucceededFromPVC(pvc) && pod.Status.Phase == v1.PodRunning {
klog.V(3).Infof("Clone succeeded, waiting for source pod %s/%s to stop running", pod.Namespace, pod.Name)
return nil
}
if err = cc.clientset.CoreV1().Pods(pod.Namespace).Delete(pod.Name, &metav1.DeleteOptions{}); err != nil {
if !k8serrors.IsNotFound(err) {
return errors.Wrap(err, "error deleting clone source pod")
}
}
}
_, err = cc.removeFinalizer(pvc)
if err != nil {
return errors.Wrap(err, "error removing finalizer")
}
cc.podExpectations.DeleteExpectations(key)
return nil
}
func (cc *CloneController) validateSourceAndTarget(targetPvc *v1.PersistentVolumeClaim) error {
sourcePvc, err := getCloneRequestSourcePVC(targetPvc, cc.Controller.pvcLister)
if err != nil {
return err
}
if err = validateCloneToken(cc.tokenValidator, sourcePvc, targetPvc); err != nil {
return err
}
return ValidateCanCloneSourceAndTargetSpec(&sourcePvc.Spec, &targetPvc.Spec)
}
//Run is being called from cdi-controller (cmd)
func (cc *CloneController) Run(threadiness int, stopCh <-chan struct{}) error {
cc.Controller.run(threadiness, stopCh, cc.runPVCWorkers)
return nil
}
func (cc *CloneController) runPVCWorkers() {
for cc.ProcessNextPvcItem() {
}
}