Operator should detect configOverrides updates (ytsaurus#314)

* ytsaurus#291 Repro test

* fix lint

* Implement configOverrides reconciliation

* Fix test

controllers/ytsaurus_controller.go

@@ -21,11 +21,17 @@ import (
 
 	appsv1 "k8s.io/api/apps/v1"
 	corev1 "k8s.io/api/core/v1"
+	"k8s.io/apimachinery/pkg/fields"
 	"k8s.io/apimachinery/pkg/runtime"
+	"k8s.io/apimachinery/pkg/types"
 	"k8s.io/client-go/tools/record"
 	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/handler"
 	"sigs.k8s.io/controller-runtime/pkg/log"
+	"sigs.k8s.io/controller-runtime/pkg/predicate"
+	"sigs.k8s.io/controller-runtime/pkg/reconcile"
 
 	ytv1 "github.com/ytsaurus/yt-k8s-operator/api/v1"
 )
@@ -37,13 +43,16 @@ type YtsaurusReconciler struct {
 	Recorder record.EventRecorder
 }
 
+const configOverridesField = ".spec.configOverrides"
+
 // +kubebuilder:rbac:groups=cluster.ytsaurus.tech,resources=ytsaurus,verbs=get;list;watch;create;update;patch;delete
 // +kubebuilder:rbac:groups=cluster.ytsaurus.tech,resources=ytsaurus/status,verbs=get;update;patch
 // +kubebuilder:rbac:groups=cluster.ytsaurus.tech,resources=ytsaurus/finalizers,verbs=update
 // +kubebuilder:rbac:groups=apps,resources=statefulset,verbs=get;list;watch;create;update;patch;delete
 // +kubebuilder:rbac:groups=apps,resources=statefulset/status,verbs=get
 // +kubebuilder:rbac:groups=core,resources=pod,verbs=get;list;watch;create;update;patch;delete
 // +kubebuilder:rbac:groups=core,resources=pod/status,verbs=get
+// +kubebuilder:rbac:groups="",resources=configmaps,verbs=get;list;watch
 func (r *YtsaurusReconciler) Reconcile(ctx context.Context, req ctrl.Request) (ctrl.Result, error) {
 	logger := log.FromContext(ctx)
 
@@ -62,12 +71,52 @@ func (r *YtsaurusReconciler) Reconcile(ctx context.Context, req ctrl.Request) (c
 
 // SetupWithManager sets up the controller with the Manager.
 func (r *YtsaurusReconciler) SetupWithManager(mgr ctrl.Manager) error {
+	// See https://book.kubebuilder.io/reference/watching-resources/externally-managed for the reference implementation
+	if err := mgr.GetFieldIndexer().IndexField(context.Background(), &ytv1.Ytsaurus{}, configOverridesField, func(rawObj client.Object) []string {
+		ytsaurusResource := rawObj.(*ytv1.Ytsaurus)
+		if ytsaurusResource.Spec.ConfigOverrides == nil {
+			return nil
+		}
+		return []string{ytsaurusResource.Spec.ConfigOverrides.Name}
+	}); err != nil {
+		return err
+	}
+
 	return ctrl.NewControllerManagedBy(mgr).
 		For(&ytv1.Ytsaurus{}).
 		Owns(&appsv1.StatefulSet{}).
 		Owns(&corev1.ConfigMap{}).
 		Owns(&corev1.Service{}).
 		Owns(&appsv1.Deployment{}).
 		Owns(&corev1.Secret{}).
+		Watches(
+			&corev1.ConfigMap{},
+			handler.EnqueueRequestsFromMapFunc(r.findObjectsForConfigMap),
+			builder.WithPredicates(predicate.ResourceVersionChangedPredicate{}),
+		).
 		Complete(r)
 }
+
+func (r *YtsaurusReconciler) findObjectsForConfigMap(ctx context.Context, configMap client.Object) []reconcile.Request {
+	// See https://book.kubebuilder.io/reference/watching-resources/externally-managed for the reference implementation
+	attachedYtsauruses := &ytv1.YtsaurusList{}
+	listOps := &client.ListOptions{
+		FieldSelector: fields.OneTermEqualSelector(configOverridesField, configMap.GetName()),
+		Namespace:     configMap.GetNamespace(),
+	}
+	err := r.List(ctx, attachedYtsauruses, listOps)
+	if err != nil {
+		return []reconcile.Request{}
+	}
+
+	requests := make([]reconcile.Request, len(attachedYtsauruses.Items))
+	for i, item := range attachedYtsauruses.Items {
+		requests[i] = reconcile.Request{
+			NamespacedName: types.NamespacedName{
+				Name:      item.GetName(),
+				Namespace: item.GetNamespace(),
+			},
+		}
+	}
+	return requests
+}

test/e2e/ytsaurus_controller_test.go

@@ -17,6 +17,7 @@ import (
 	"go.ytsaurus.tech/yt/go/mapreduce/spec"
 	"go.ytsaurus.tech/yt/go/yt/ytrpc"
 	"go.ytsaurus.tech/yt/go/yterrors"
+	apierrors "k8s.io/apimachinery/pkg/api/errors"
 
 	corev1 "k8s.io/api/core/v1"
 	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
@@ -249,6 +250,17 @@ func runImpossibleUpdateAndRollback(ytsaurus *ytv1.Ytsaurus, ytClient yt.Client)
 	Expect(ytClient.ListNode(ctx, ypath.Path("/"), &res, nil)).Should(Succeed())
 }
 
+func createConfigOverridesMap(namespace, name, key, value string) {
+	resource := corev1.ConfigMap{
+		ObjectMeta: metav1.ObjectMeta{
+			Name:      name,
+			Namespace: namespace,
+		},
+		Data: map[string]string{key: value},
+	}
+	Expect(k8sClient.Create(ctx, &resource)).Should(Succeed())
+}
+
 type testRow struct {
 	A string `yson:"a"`
 }
@@ -769,6 +781,60 @@ var _ = Describe("Basic test for Ytsaurus controller", func() {
 			},
 		)
 
+		It(
+			"ConfigOverrides update shout trigger reconciliation",
+			func(ctx context.Context) {
+				namespace := "test-overrides"
+				coName := "config-overrides"
+				ytsaurus := testutil.CreateMinimalYtsaurusResource(namespace)
+				ytsaurus.Spec.ConfigOverrides = &corev1.LocalObjectReference{Name: coName}
+				DeferCleanup(deleteYtsaurus, ytsaurus)
+
+				deployAndCheck(ytsaurus, namespace)
+				log.Info("sleep a little, because after cluster is running some reconciliations still may happen " +
+					"for some time (and for some reason) and we don't want to interfere before map creation")
+				time.Sleep(3 * time.Second)
+
+				dsPodName := "ds-0"
+				msPodName := "ms-0"
+
+				getPodByName := func(name string) (*corev1.Pod, error) {
+					ds0Name := types.NamespacedName{Name: name, Namespace: namespace}
+					dsPod := &corev1.Pod{}
+					err := k8sClient.Get(ctx, ds0Name, dsPod)
+					return dsPod, err
+				}
+				dsPod, err := getPodByName(dsPodName)
+				Expect(err).Should(Succeed())
+				msPod, err := getPodByName(msPodName)
+				Expect(err).Should(Succeed())
+				dsPodCreatedBefore := dsPod.CreationTimestamp.Time
+				log.Info("ds created before", "ts", dsPodCreatedBefore)
+				msPodCreatedBefore := msPod.CreationTimestamp.Time
+
+				discoveryOverride := "{resource_limits = {total_memory = 123456789;};}"
+				createConfigOverridesMap(namespace, coName, "ytserver-discovery.yson", discoveryOverride)
+
+				Eventually(ctx, func() bool {
+					pod, err := getPodByName(dsPodName)
+					if apierrors.IsNotFound(err) {
+						return false
+					}
+					dsPodCreatedAfter := pod.CreationTimestamp
+					log.Info("ds created after", "ts", dsPodCreatedAfter)
+					return dsPodCreatedAfter.After(dsPodCreatedBefore)
+				}).WithTimeout(30 * time.Second).
+					WithPolling(300 * time.Millisecond).
+					Should(BeTrueBecause("ds pod should be recreated on configOverrides creation"))
+
+				msPod, err = getPodByName(msPodName)
+				Expect(err).Should(Succeed())
+				Expect(msPod.CreationTimestamp.Time).Should(
+					Equal(msPodCreatedBefore), "ms pods shouldn't be recreated",
+				)
+			},
+		)
+
 		It("Sensors should be annotated with host", func(ctx context.Context) {
 			namespace := "testsolomon"
 			ytsaurus := testutil.CreateMinimalYtsaurusResource(namespace)