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watcher.go
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watcher.go
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package crwatcher
import (
"bytes"
"context"
"fmt"
"os"
"sync"
"time"
"github.com/cenkalti/backoff/v4"
"github.com/hashicorp/go-multierror"
corev1 "k8s.io/api/core/v1"
"k8s.io/apimachinery/pkg/api/errors"
"k8s.io/apimachinery/pkg/runtime"
"k8s.io/apimachinery/pkg/types"
utilruntime "k8s.io/apimachinery/pkg/util/runtime"
clientgoscheme "k8s.io/client-go/kubernetes/scheme"
"k8s.io/client-go/tools/record"
ctrl "sigs.k8s.io/controller-runtime"
"sigs.k8s.io/controller-runtime/pkg/client"
"sigs.k8s.io/controller-runtime/pkg/event"
"sigs.k8s.io/controller-runtime/pkg/predicate"
"github.com/fluxninja/aperture/operator/api"
policyv1alpha1 "github.com/fluxninja/aperture/operator/api/policy/v1alpha1"
"github.com/fluxninja/aperture/pkg/log"
"github.com/fluxninja/aperture/pkg/notifiers"
"github.com/fluxninja/aperture/pkg/panichandler"
)
// watcher holds the state of the watcher.
type watcher struct {
waitGroup sync.WaitGroup
notifiers.Trackers
dynamicConfigTrackers notifiers.Trackers
ctx context.Context
cancel context.CancelFunc
client.Client
scheme *runtime.Scheme
recorder record.EventRecorder
resourcesDeleted map[types.NamespacedName]bool
}
// Make sure Watcher implements notifiers.Watcher interface.
var _ notifiers.Watcher = &watcher{}
// NewWatcher prepares watcher instance for the Kuberneter Policy.
func NewWatcher() (*watcher, error) {
ctx, cancel := context.WithCancel(context.Background())
watcher := &watcher{
Trackers: notifiers.NewDefaultTrackers(),
dynamicConfigTrackers: notifiers.NewDefaultTrackers(),
ctx: ctx,
cancel: cancel,
}
return watcher, nil
}
// Start starts the watcher go routines and handles Policy Custom resource events from Kubernetes.
func (w *watcher) Start() error {
err := w.Trackers.Start()
if err != nil {
return err
}
err = w.dynamicConfigTrackers.Start()
if err != nil {
return err
}
w.waitGroup.Add(1)
panichandler.Go(func() {
defer w.waitGroup.Done()
operation := func() error {
scheme := runtime.NewScheme()
utilruntime.Must(clientgoscheme.AddToScheme(scheme))
utilruntime.Must(api.AddToScheme(scheme))
mgr, err := ctrl.NewManager(ctrl.GetConfigOrDie(), ctrl.Options{
Scheme: scheme,
MetricsBindAddress: "0",
LeaderElection: false,
Namespace: os.Getenv("APERTURE_CONTROLLER_NAMESPACE"),
})
if err != nil {
log.Error().Err(err).Msg("Failed to create Kubernetes Reconciler for Policy")
return nil
}
w.Client = mgr.GetClient()
w.scheme = scheme
w.recorder = mgr.GetEventRecorderFor("aperture-policy")
if err = w.SetupWithManager(mgr); err != nil {
log.Error().Err(err).Msg("Failed to create Kubernetes controller for policy")
return nil
}
return mgr.Start(w.ctx)
}
boff := backoff.NewConstantBackOff(5 * time.Second)
_ = backoff.Retry(operation, backoff.WithContext(boff, w.ctx))
log.Info().Msg("Stopping kubernetes watcher for Policy")
})
return nil
}
// Stop stops the watcher go routines.
func (w *watcher) Stop() error {
w.cancel()
w.waitGroup.Wait()
var err, merr error
err = w.Trackers.Stop()
if err != nil {
merr = multierror.Append(merr, err)
}
err = w.dynamicConfigTrackers.Stop()
if err != nil {
merr = multierror.Append(merr, err)
}
return merr
}
// GetDynamicConfigWatcher returns the config watcher.
func (w *watcher) GetDynamicConfigWatcher() notifiers.Watcher {
return w.dynamicConfigTrackers
}
// Reconcile is part of the main kubernetes reconciliation loop which aims to
// move the current state of the cluster closer to the desired state.
// TODO(user): Modify the Reconcile function to compare the state specified by
// the Policy object against the actual cluster state, and then
// perform operations to make the cluster state reflect the state specified by
// the user.
//
// For more details, check Reconcile and its Result here:
// - https://pkg.go.dev/sigs.k8s.io/controller-runtime@v0.11.2/pkg/reconcile
func (w *watcher) Reconcile(ctx context.Context, req ctrl.Request) (ctrl.Result, error) {
if w.resourcesDeleted == nil {
w.resourcesDeleted = make(map[types.NamespacedName]bool)
}
instance := &policyv1alpha1.Policy{}
err := w.Get(ctx, req.NamespacedName, instance)
if err != nil && errors.IsNotFound(err) {
if !w.resourcesDeleted[req.NamespacedName] {
// Request object not found, could have been deleted after reconcile request.
// Owned objects are automatically garbage collected. For additional cleanup logic use finalizers.
// Return and don't requeue
log.Debug().Msg(fmt.Sprintf("Handling deletion of resources for Instance '%s' in Namespace '%s'", req.Name, req.Namespace))
instance.Name = req.Name
instance.Namespace = req.Namespace
w.deleteResources(ctx, instance.DeepCopy())
w.resourcesDeleted[req.NamespacedName] = true
log.Debug().Msg("Policy resource not found. Ignoring since object must be deleted")
}
return ctrl.Result{}, nil
} else if err != nil {
// Error reading the object - requeue the request.
log.Error().Err(err).Msg("failed to get Policy")
return ctrl.Result{}, err
}
// Handing delete operation
if instance.GetDeletionTimestamp() != nil {
log.Debug().Msg(fmt.Sprintf("Handling deletion of resources for Instance '%s' in Namespace '%s'", instance.GetName(), instance.GetNamespace()))
w.deleteResources(ctx, instance.DeepCopy())
w.resourcesDeleted[req.NamespacedName] = true
return ctrl.Result{}, nil
}
instance.Status.Status = "uploading"
if err := w.updateStatus(ctx, instance.DeepCopy()); err != nil {
return ctrl.Result{}, err
}
w.resourcesDeleted[req.NamespacedName] = false
if err := w.reconcilePolicy(ctx, instance); err != nil {
return ctrl.Result{}, err
}
instance.Status.Status = "uploaded"
if err := w.updateStatus(ctx, instance.DeepCopy()); err != nil {
return ctrl.Result{}, err
}
return ctrl.Result{}, nil
}
func (w *watcher) deleteResources(ctx context.Context, instance *policyv1alpha1.Policy) {
w.RemoveEvent(notifiers.Key(instance.GetName()))
w.dynamicConfigTrackers.RemoveEvent(notifiers.Key(instance.GetName()))
}
// updateResource updates the Aperture resource in Kubernetes.
func (w *watcher) updateStatus(ctx context.Context, instance *policyv1alpha1.Policy) error {
attempt := 5
status := instance.DeepCopy().Status
for attempt > 0 {
attempt -= 1
if err := w.Status().Update(ctx, instance); err != nil {
if errors.IsConflict(err) {
namespacesName := types.NamespacedName{
Namespace: instance.GetNamespace(),
Name: instance.GetName(),
}
if err = w.Get(ctx, namespacesName, instance); err != nil {
return err
}
instance.Status = status
continue
}
return err
}
}
return nil
}
// reconcilePolicy sends a write event to notifier to get it uploaded on the Etcd.
func (w *watcher) reconcilePolicy(ctx context.Context, instance *policyv1alpha1.Policy) error {
w.WriteEvent(notifiers.Key(instance.GetName()), instance.Spec.Raw)
w.dynamicConfigTrackers.WriteEvent(notifiers.Key(instance.GetName()), instance.DynamicConfig.Raw)
w.recorder.Eventf(instance, corev1.EventTypeWarning, "UploadSuccessful", "Uploaded policy to trackers.")
return nil
}
// eventFilters sets up a Predicate filter for the received events.
func eventFiltersForPolicy() predicate.Predicate {
return predicate.Funcs{
CreateFunc: func(create event.CreateEvent) bool {
_, ok := create.Object.(*policyv1alpha1.Policy)
return ok
},
UpdateFunc: func(update event.UpdateEvent) bool {
new, ok1 := update.ObjectNew.(*policyv1alpha1.Policy)
old, ok2 := update.ObjectOld.(*policyv1alpha1.Policy)
if !ok1 || !ok2 {
return false
}
return !bytes.Equal(old.Spec.Raw, new.Spec.Raw) || !bytes.Equal(old.DynamicConfig.Raw, new.DynamicConfig.Raw) || new.GetDeletionTimestamp() != nil
},
DeleteFunc: func(delete event.DeleteEvent) bool {
return !delete.DeleteStateUnknown
},
}
}
// SetupWithManager sets up the controller with the Manager.
func (w *watcher) SetupWithManager(mgr ctrl.Manager) error {
return ctrl.NewControllerManagedBy(mgr).
For(&policyv1alpha1.Policy{}).
WithEventFilter(eventFiltersForPolicy()).
Complete(w)
}