ROX-12219: Add support for pause-reconcile annotation (#29)

Co-authored-by: Marcin Owsiany <[email protected]>

Author: vladbologa

pkg/reconciler/internal/conditions/conditions.go

@@ -29,10 +29,12 @@ const (
 	TypeDeployed       = "Deployed"
 	TypeReleaseFailed  = "ReleaseFailed"
 	TypeIrreconcilable = "Irreconcilable"
+	TypePaused         = "Paused"
 
-	ReasonInstallSuccessful   = status.ConditionReason("InstallSuccessful")
-	ReasonUpgradeSuccessful   = status.ConditionReason("UpgradeSuccessful")
-	ReasonUninstallSuccessful = status.ConditionReason("UninstallSuccessful")
+	ReasonInstallSuccessful            = status.ConditionReason("InstallSuccessful")
+	ReasonUpgradeSuccessful            = status.ConditionReason("UpgradeSuccessful")
+	ReasonUninstallSuccessful          = status.ConditionReason("UninstallSuccessful")
+	ReasonPauseReconcileAnnotationTrue = status.ConditionReason("PauseReconcileAnnotationTrue")
 
 	ReasonErrorGettingClient       = status.ConditionReason("ErrorGettingClient")
 	ReasonErrorGettingValues       = status.ConditionReason("ErrorGettingValues")
@@ -60,6 +62,10 @@ func Irreconcilable(stat corev1.ConditionStatus, reason status.ConditionReason,
 	return newCondition(TypeIrreconcilable, stat, reason, message)
 }
 
+func Paused(stat corev1.ConditionStatus, reason status.ConditionReason, message interface{}) status.Condition {
+	return newCondition(TypePaused, stat, reason, message)
+}
+
 func newCondition(t status.ConditionType, s corev1.ConditionStatus, r status.ConditionReason, m interface{}) status.Condition {
 	message := fmt.Sprintf("%s", m)
 	return status.Condition{

pkg/reconciler/internal/updater/updater.go

@@ -158,6 +158,12 @@ func EnsureConditionUnknown(t status.ConditionType) UpdateStatusFunc {
 	}
 }
 
+func EnsureConditionAbsent(t status.ConditionType) UpdateStatusFunc {
+	return func(status *helmAppStatus) bool {
+		return status.Conditions.RemoveCondition(t)
+	}
+}
+
 func EnsureDeployedRelease(rel *release.Release) UpdateStatusFunc {
 	return func(status *helmAppStatus) bool {
 		newRel := helmAppReleaseFor(rel)

pkg/reconciler/reconciler.go

@@ -92,11 +92,12 @@ type Reconciler struct {
 
 	stripManifestFromStatus bool
 
-	annotSetupOnce       sync.Once
-	annotations          map[string]struct{}
-	installAnnotations   map[string]annotation.Install
-	upgradeAnnotations   map[string]annotation.Upgrade
-	uninstallAnnotations map[string]annotation.Uninstall
+	annotSetupOnce           sync.Once
+	annotations              map[string]struct{}
+	installAnnotations       map[string]annotation.Install
+	upgradeAnnotations       map[string]annotation.Upgrade
+	uninstallAnnotations     map[string]annotation.Uninstall
+	pauseReconcileAnnotation string
 }
 
 // New creates a new Reconciler that reconciles custom resources that define a
@@ -470,6 +471,18 @@ func WithUninstallAnnotations(as ...annotation.Uninstall) Option {
 	}
 }
 
+// WithPauseReconcileAnnotation is an Option that sets
+// a PauseReconcile annotation. If the Custom Resource watched by this
+// reconciler has the given annotation, and its value is set to `true`,
+// then reconciliation for this CR will not be performed until this annotation
+// is removed.
+func WithPauseReconcileAnnotation(annotationName string) Option {
+	return func(r *Reconciler) error {
+		r.pauseReconcileAnnotation = annotationName
+		return nil
+	}
+}
+
 // WithPreHook is an Option that configures the reconciler to run the given
 // PreHook just before performing any actions (e.g. install, upgrade, uninstall,
 // or reconciliation).
@@ -662,6 +675,31 @@ func (r *Reconciler) Reconcile(ctx context.Context, req ctrl.Request) (_ ctrl.Re
 		}
 	}()
 
+	if r.pauseReconcileAnnotation != "" {
+		if v, ok := obj.GetAnnotations()[r.pauseReconcileAnnotation]; ok {
+			if v == "true" {
+				log.Info(fmt.Sprintf("Resource has '%s' annotation set to 'true', reconcile paused.", r.pauseReconcileAnnotation))
+				u.UpdateStatus(
+					updater.EnsureCondition(conditions.Paused(corev1.ConditionTrue, conditions.ReasonPauseReconcileAnnotationTrue, "")),
+					updater.EnsureConditionUnknown(conditions.TypeIrreconcilable),
+					updater.EnsureConditionUnknown(conditions.TypeDeployed),
+					updater.EnsureConditionUnknown(conditions.TypeInitialized),
+					updater.EnsureConditionUnknown(conditions.TypeReleaseFailed),
+					updater.EnsureDeployedRelease(nil),
+				)
+				return ctrl.Result{}, nil
+			}
+		}
+	}
+
+	u.UpdateStatus(
+		// TODO(ROX-12637): change to updater.EnsureCondition(conditions.Paused(corev1.ConditionFalse, "", "")))
+		// once stackrox operator with pause support is released.
+		// At that time also add `Paused` to the list of conditions expected in stackrox operator e2e tests.
+		// Otherwise, the number of conditions in the `status.conditions` list will vary depending on the version
+		// of used operator, which is cumbersome due to https://github.com/kudobuilder/kuttl/issues/76
+		updater.EnsureConditionAbsent(conditions.TypePaused))
+
 	actionClient, err := r.actionClientGetter.ActionClientFor(ctx, obj)
 	if err != nil {
 		u.UpdateStatus(

pkg/reconciler/reconciler_test.go

@@ -404,6 +404,13 @@ var _ = Describe("Reconciler", func() {
 				}))
 			})
 		})
+		_ = Describe("WithPauseReconcileAnnotation", func() {
+			It("should set the pauseReconcileAnnotation field to the annotation name", func() {
+				a := "my.domain/pause-reconcile"
+				Expect(WithPauseReconcileAnnotation(a)(r)).To(Succeed())
+				Expect(r.pauseReconcileAnnotation).To(Equal(a))
+			})
+		})
 		_ = Describe("WithPreHook", func() {
 			It("should set a reconciler prehook", func() {
 				called := false
@@ -545,6 +552,7 @@ var _ = Describe("Reconciler", func() {
 						WithInstallAnnotations(annotation.InstallDescription{}),
 						WithUpgradeAnnotations(annotation.UpgradeDescription{}),
 						WithUninstallAnnotations(annotation.UninstallDescription{}),
+						WithPauseReconcileAnnotation("my.domain/pause-reconcile"),
 						WithOverrideValues(map[string]string{
 							"image.repository": "custom-nginx",
 						}),
@@ -559,6 +567,7 @@ var _ = Describe("Reconciler", func() {
 						WithInstallAnnotations(annotation.InstallDescription{}),
 						WithUpgradeAnnotations(annotation.UpgradeDescription{}),
 						WithUninstallAnnotations(annotation.UninstallDescription{}),
+						WithPauseReconcileAnnotation("my.domain/pause-reconcile"),
 						WithOverrideValues(map[string]string{
 							"image.repository": "custom-nginx",
 						}),
@@ -1429,6 +1438,64 @@ var _ = Describe("Reconciler", func() {
 									verifyNoRelease(ctx, mgr.GetClient(), obj.GetNamespace(), obj.GetName(), currentRelease)
 								})
 
+								By("ensuring the finalizer is removed and the CR is deleted", func() {
+									err := mgr.GetAPIReader().Get(ctx, objKey, obj)
+									Expect(apierrors.IsNotFound(err)).To(BeTrue())
+								})
+							})
+						})
+						When("pause-reconcile annotation is present", func() {
+							It("pauses reconciliation", func() {
+								By("adding the pause-reconcile annotation to the CR", func() {
+									Expect(mgr.GetClient().Get(ctx, objKey, obj)).To(Succeed())
+									obj.SetAnnotations(map[string]string{"my.domain/pause-reconcile": "true"})
+									obj.Object["spec"] = map[string]interface{}{"replicaCount": "666"}
+									Expect(mgr.GetClient().Update(ctx, obj)).To(Succeed())
+								})
+
+								By("deleting the CR", func() {
+									Expect(mgr.GetClient().Delete(ctx, obj)).To(Succeed())
+								})
+
+								By("successfully reconciling a request when paused", func() {
+									res, err := r.Reconcile(ctx, req)
+									Expect(res).To(Equal(reconcile.Result{}))
+									Expect(err).ToNot(HaveOccurred())
+								})
+
+								By("getting the CR", func() {
+									Expect(mgr.GetAPIReader().Get(ctx, objKey, obj)).To(Succeed())
+								})
+
+								By("verifying the CR status is Paused", func() {
+									objStat := &objStatus{}
+									Expect(runtime.DefaultUnstructuredConverter.FromUnstructured(obj.Object, objStat)).To(Succeed())
+									Expect(objStat.Status.Conditions.IsTrueFor(conditions.TypePaused)).To(BeTrue())
+								})
+
+								By("verifying the release has not changed", func() {
+									rel, err := ac.Get(obj.GetName())
+									Expect(err).ToNot(HaveOccurred())
+									Expect(rel).NotTo(BeNil())
+									Expect(*rel).To(Equal(*currentRelease))
+								})
+
+								By("removing the pause-reconcile annotation from the CR", func() {
+									Expect(mgr.GetClient().Get(ctx, objKey, obj)).To(Succeed())
+									obj.SetAnnotations(nil)
+									Expect(mgr.GetClient().Update(ctx, obj)).To(Succeed())
+								})
+
+								By("successfully reconciling a request", func() {
+									res, err := r.Reconcile(ctx, req)
+									Expect(res).To(Equal(reconcile.Result{}))
+									Expect(err).ToNot(HaveOccurred())
+								})
+
+								By("verifying the release is uninstalled", func() {
+									verifyNoRelease(ctx, mgr.GetClient(), obj.GetNamespace(), obj.GetName(), currentRelease)
+								})
+
 								By("ensuring the finalizer is removed and the CR is deleted", func() {
 									err := mgr.GetAPIReader().Get(ctx, objKey, obj)
 									Expect(apierrors.IsNotFound(err)).To(BeTrue())