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syncer.go
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syncer.go
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package pods
import (
"context"
"reflect"
"sync"
"time"
context2 "github.com/loft-sh/vcluster/cmd/vcluster/context"
"github.com/loft-sh/vcluster/pkg/controllers/resources/generic"
"github.com/loft-sh/vcluster/pkg/controllers/resources/nodes"
"github.com/loft-sh/vcluster/pkg/controllers/resources/nodes/nodeservice"
translatepods "github.com/loft-sh/vcluster/pkg/controllers/resources/pods/translate"
"github.com/loft-sh/vcluster/pkg/util/loghelper"
"github.com/pkg/errors"
corev1 "k8s.io/api/core/v1"
"k8s.io/apimachinery/pkg/api/equality"
kerrors "k8s.io/apimachinery/pkg/api/errors"
metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
"k8s.io/apimachinery/pkg/types"
"k8s.io/client-go/kubernetes"
"k8s.io/client-go/tools/record"
"k8s.io/client-go/util/workqueue"
ctrl "sigs.k8s.io/controller-runtime"
"sigs.k8s.io/controller-runtime/pkg/builder"
"sigs.k8s.io/controller-runtime/pkg/client"
"sigs.k8s.io/controller-runtime/pkg/event"
"sigs.k8s.io/controller-runtime/pkg/handler"
"sigs.k8s.io/controller-runtime/pkg/reconcile"
"sigs.k8s.io/controller-runtime/pkg/source"
)
var (
// Default grace period in seconds
minimumGracePeriodInSeconds int64 = 30
zero = int64(0)
)
func RegisterIndices(ctx *context2.ControllerContext) error {
err := generic.RegisterSyncerIndices(ctx, &corev1.Pod{})
if err != nil {
return err
}
return nil
}
func Register(ctx *context2.ControllerContext, eventBroadcaster record.EventBroadcaster) error {
// register controllers
virtualClusterClient, err := kubernetes.NewForConfig(ctx.VirtualManager.GetConfig())
if err != nil {
return err
}
// parse node selector
var nodeSelector *metav1.LabelSelector
if ctx.Options.EnforceNodeSelector && ctx.Options.NodeSelector != "" {
nodeSelector, err = metav1.ParseToLabelSelector(ctx.Options.NodeSelector)
if err != nil {
return errors.Wrap(err, "parse node selector")
} else if len(nodeSelector.MatchExpressions) > 0 {
return errors.New("match expressions in the node selector are not supported")
} else if len(nodeSelector.MatchLabels) == 0 {
return errors.New("at least one label=value pair has to be defined in the label selector")
}
}
// create pod translator
eventRecorder := eventBroadcaster.NewRecorder(ctx.VirtualManager.GetScheme(), corev1.EventSource{Component: "pod-syncer"})
translator, err := translatepods.NewTranslator(ctx, eventRecorder)
if err != nil {
return errors.Wrap(err, "create pod translator")
}
podsClient := ctx.VirtualManager.GetClient()
return generic.RegisterSyncerWithOptions(ctx, "pod", &syncer{
Translator: generic.NewNamespacedTranslator(ctx.Options.TargetNamespace, ctx.VirtualManager.GetClient(), &corev1.Pod{}),
sharedNodesMutex: ctx.LockFactory.GetLock("nodes-controller"),
eventRecorder: eventRecorder,
targetNamespace: ctx.Options.TargetNamespace,
serviceName: ctx.Options.ServiceName,
currentNamespace: ctx.CurrentNamespace,
currentNamespaceClient: ctx.CurrentNamespaceClient,
localClient: ctx.LocalManager.GetClient(),
virtualClient: ctx.VirtualManager.GetClient(),
virtualClusterClient: virtualClusterClient,
nodeServiceProvider: ctx.NodeServiceProvider,
podTranslator: translator,
useFakeNodes: !ctx.Controllers["nodes"],
creator: generic.NewGenericCreator(ctx.LocalManager.GetClient(), eventRecorder, "pod"),
nodeSelector: nodeSelector,
}, &generic.SyncerOptions{
// reconcile pods on Namespace update in order to pick up ns label changes
ModifyController: func(builder *builder.Builder) *builder.Builder {
eventHandler := handler.Funcs{
UpdateFunc: func(e event.UpdateEvent, q workqueue.RateLimitingInterface) {
// no need to reconcile pods if namespace labels didn't change
if reflect.DeepEqual(e.ObjectNew.GetLabels(), e.ObjectOld.GetLabels()) {
return
}
ns := e.ObjectNew.GetName()
pods := &corev1.PodList{}
err := podsClient.List(ctx.Context, pods, client.InNamespace(ns))
if err != nil {
log := loghelper.New("pods-syncer-ns-watch-handler")
log.Infof("failed to list pods in the %s namespace when handling namespace update: %v", ns, err)
return
}
for _, pod := range pods.Items {
q.Add(reconcile.Request{NamespacedName: types.NamespacedName{
Name: pod.GetName(),
Namespace: ns,
}})
}
},
}
return builder.Watches(&source.Kind{Type: &corev1.Namespace{}}, eventHandler)
},
})
}
type syncer struct {
generic.Translator
useFakeNodes bool
sharedNodesMutex sync.Locker
eventRecorder record.EventRecorder
targetNamespace string
serviceName string
currentNamespace string
currentNamespaceClient client.Client
podTranslator translatepods.Translator
localClient client.Client
virtualClient client.Client
virtualClusterClient kubernetes.Interface
nodeServiceProvider nodeservice.NodeServiceProvider
nodeSelector *metav1.LabelSelector
creator *generic.GenericCreator
}
func (s *syncer) New() client.Object {
return &corev1.Pod{}
}
func (s *syncer) Forward(ctx context.Context, vObj client.Object, log loghelper.Logger) (ctrl.Result, error) {
vPod := vObj.(*corev1.Pod)
if vPod.DeletionTimestamp != nil {
// delete pod immediately
log.Infof("delete pod %s/%s immediately, because it is being deleted & there is no physical pod", vPod.Namespace, vPod.Name)
err := s.virtualClient.Delete(ctx, vPod, &client.DeleteOptions{
GracePeriodSeconds: &zero,
})
if kerrors.IsNotFound(err) {
return ctrl.Result{}, nil
}
return ctrl.Result{}, err
}
pPod, err := s.translate(vPod)
if err != nil {
return ctrl.Result{}, err
}
// ensure node selector
if s.nodeSelector != nil {
// 2 cases:
// 1. Pod already has a nodeName -> then we check if the node exists in the virtual cluster
// 2. Pod has no nodeName -> then we set the nodeSelector
if pPod.Spec.NodeName == "" {
pPod.Spec.NodeSelector = s.nodeSelector.MatchLabels
} else {
// make sure the node does exist in the virtual cluster
err = s.virtualClient.Get(ctx, types.NamespacedName{Name: pPod.Spec.NodeName}, &corev1.Node{})
if err != nil {
if !kerrors.IsNotFound(err) {
return ctrl.Result{}, err
}
s.eventRecorder.Eventf(vPod, "Warning", "SyncWarning", "Given nodeName %s does not exist in virtual cluster", pPod.Spec.NodeName)
return ctrl.Result{RequeueAfter: time.Second * 15}, nil
}
}
}
return s.creator.Create(ctx, vPod, pPod, log)
}
func (s *syncer) Update(ctx context.Context, pObj client.Object, vObj client.Object, log loghelper.Logger) (ctrl.Result, error) {
vPod := vObj.(*corev1.Pod)
pPod := pObj.(*corev1.Pod)
// should pod get deleted?
if pPod.DeletionTimestamp != nil {
if vPod.DeletionTimestamp == nil {
gracePeriod := minimumGracePeriodInSeconds
if vPod.Spec.TerminationGracePeriodSeconds != nil {
gracePeriod = *vPod.Spec.TerminationGracePeriodSeconds
}
log.Infof("delete virtual pod %s/%s, because the physical pod is being deleted", vPod.Namespace, vPod.Name)
if err := s.virtualClient.Delete(ctx, vPod, &client.DeleteOptions{GracePeriodSeconds: &gracePeriod}); err != nil {
return ctrl.Result{}, err
}
} else if *vPod.DeletionGracePeriodSeconds != *pPod.DeletionGracePeriodSeconds {
log.Infof("delete virtual pPod %s/%s with grace period seconds %v", vPod.Namespace, vPod.Name, *pPod.DeletionGracePeriodSeconds)
if err := s.virtualClient.Delete(ctx, vPod, &client.DeleteOptions{GracePeriodSeconds: pPod.DeletionGracePeriodSeconds, Preconditions: metav1.NewUIDPreconditions(string(vPod.UID))}); err != nil {
return ctrl.Result{}, err
}
}
return ctrl.Result{}, nil
} else if vPod.DeletionTimestamp != nil {
log.Infof("delete physical pod %s/%s, because virtual pod is being deleted", pPod.Namespace, pPod.Name)
err := s.localClient.Delete(ctx, pPod, &client.DeleteOptions{
GracePeriodSeconds: vPod.DeletionGracePeriodSeconds,
Preconditions: metav1.NewUIDPreconditions(string(pPod.UID)),
})
if kerrors.IsNotFound(err) {
return ctrl.Result{}, nil
}
return ctrl.Result{}, err
}
// make sure node exists for pod
if pPod.Spec.NodeName != "" {
assigned, err := s.ensureNode(ctx, pPod, vPod, log)
if err != nil {
return ctrl.Result{}, err
} else if assigned {
return ctrl.Result{Requeue: true}, nil
}
} else if pPod.Spec.NodeName != "" && vPod.Spec.NodeName != "" && pPod.Spec.NodeName != vPod.Spec.NodeName {
// if physical pod nodeName is different from virtual pod nodeName, we delete the virtual one
log.Infof("delete virtual pod %s/%s, because node name is different between the two", vPod.Namespace, vPod.Name)
err := s.virtualClient.Delete(ctx, vPod, &client.DeleteOptions{GracePeriodSeconds: &minimumGracePeriodInSeconds})
if err != nil {
return ctrl.Result{}, err
}
return ctrl.Result{}, nil
}
// has status changed?
strippedPod := stripHostRewriteContainer(pPod)
if !equality.Semantic.DeepEqual(vPod.Status, strippedPod.Status) {
newPod := vPod.DeepCopy()
newPod.Status = strippedPod.Status
log.Infof("update virtual pod %s/%s, because status has changed", vPod.Namespace, vPod.Name)
err := s.virtualClient.Status().Update(ctx, newPod)
if err != nil {
if !kerrors.IsConflict(err) {
s.eventRecorder.Eventf(vObj, "Warning", "SyncError", "Error updating pod: %v", err)
}
return ctrl.Result{}, err
}
return ctrl.Result{}, nil
}
// update the virtual pod if the spec has changed
updatedPod, err := s.translateUpdate(pPod, vPod)
if err != nil {
return ctrl.Result{}, err
}
return s.creator.Update(ctx, vPod, updatedPod, log)
}
func (s *syncer) ensureNode(ctx context.Context, pObj *corev1.Pod, vObj *corev1.Pod, log loghelper.Logger) (bool, error) {
s.sharedNodesMutex.Lock()
defer s.sharedNodesMutex.Unlock()
// ensure the node is available in the virtual cluster, if not and we sync the pod to the virtual cluster,
// it will get deleted automatically by kubernetes so we ensure the node is synced or alternatively we could fake it
vNode := &corev1.Node{}
err := s.virtualClient.Get(ctx, types.NamespacedName{Name: pObj.Spec.NodeName}, vNode)
if err != nil {
if !kerrors.IsNotFound(err) {
log.Infof("error retrieving virtual node %s: %v", pObj.Spec.NodeName, err)
return false, err
}
if !s.useFakeNodes {
// we have to sync the node
// so first get the physical node
pNode := &corev1.Node{}
err = s.localClient.Get(ctx, types.NamespacedName{Name: pObj.Spec.NodeName}, pNode)
if err != nil {
log.Infof("error retrieving physical node %s: %v", pObj.Spec.NodeName, err)
return false, err
}
// now insert it into the virtual cluster
log.Infof("create virtual node %s, because pod %s/%s uses it and it is not available in virtual cluster", pObj.Spec.NodeName, vObj.Namespace, vObj.Name)
vNode = pNode.DeepCopy()
vNode.ObjectMeta = metav1.ObjectMeta{
Name: pNode.Name,
}
err = s.virtualClient.Create(ctx, vNode)
if err != nil {
log.Infof("error creating virtual node %s: %v", pObj.Spec.NodeName, err)
return false, err
}
} else {
// now insert it into the virtual cluster
log.Infof("create virtual fake node %s, because pod %s/%s uses it and it is not available in virtual cluster", pObj.Spec.NodeName, vObj.Namespace, vObj.Name)
// create fake node
err = nodes.CreateFakeNode(ctx, s.nodeServiceProvider, s.virtualClient, types.NamespacedName{Name: pObj.Spec.NodeName})
if err != nil {
log.Infof("error creating virtual fake node %s: %v", pObj.Spec.NodeName, err)
return false, err
}
}
}
if vObj.Spec.NodeName != pObj.Spec.NodeName {
err = s.assignNodeToPod(ctx, pObj, vObj, log)
if err != nil {
return false, err
}
return true, nil
}
return false, nil
}
func (s *syncer) assignNodeToPod(ctx context.Context, pObj *corev1.Pod, vObj *corev1.Pod, log loghelper.Logger) error {
log.Infof("bind virtual pod %s/%s to node %s, because node name between physical and virtual is different", vObj.Namespace, vObj.Name, pObj.Spec.NodeName)
err := s.virtualClusterClient.CoreV1().Pods(vObj.Namespace).Bind(ctx, &corev1.Binding{
ObjectMeta: metav1.ObjectMeta{
Name: vObj.Name,
Namespace: vObj.Namespace,
},
Target: corev1.ObjectReference{
Kind: "Node",
Name: pObj.Spec.NodeName,
APIVersion: "v1",
},
}, metav1.CreateOptions{})
if err != nil {
s.eventRecorder.Eventf(vObj, "Warning", "SyncError", "Error binding pod: %v", err)
return err
}
return nil
}
func stripHostRewriteContainer(pPod *corev1.Pod) *corev1.Pod {
if pPod.Annotations == nil || pPod.Annotations[translatepods.HostsRewrittenAnnotation] != "true" {
return pPod
}
newPod := pPod.DeepCopy()
newInitContainerStatuses := []corev1.ContainerStatus{}
if len(newPod.Status.InitContainerStatuses) > 0 {
for _, v := range newPod.Status.InitContainerStatuses {
if v.Name == translatepods.HostsRewriteContainerName {
continue
}
newInitContainerStatuses = append(newInitContainerStatuses, v)
}
newPod.Status.InitContainerStatuses = newInitContainerStatuses
}
return newPod
}