Provide CloudEvents around the management of ScaledObjects resources

CHANGELOG.md

@@ -62,6 +62,7 @@ To learn more about active deprecations, we recommend checking [GitHub Discussio
 - **General**: Add --ca-dir flag to KEDA operator to specify directories with CA certificates for scalers to authenticate TLS connections (defaults to /custom/ca) ([#5860](https://github.com/kedacore/keda/issues/5860))
 - **General**: Declarative parsing of scaler config ([#5037](https://github.com/kedacore/keda/issues/5037)|[#5797](https://github.com/kedacore/keda/issues/5797))
 - **General**: Introduce new Splunk Scaler ([#5904](https://github.com/kedacore/keda/issues/5904))
+- **General**: Provide CloudEvents around the management of ScaledObjects resources ([#3522](https://github.com/kedacore/keda/issues/3522))
 - **General**: Remove deprecated Kustomize commonLabels ([#5888](https://github.com/kedacore/keda/pull/5888))
 - **General**: Support for Kubernetes v1.30 ([#5828](https://github.com/kedacore/keda/issues/5828))
 

apis/eventing/v1alpha1/cloudevent_types.go

@@ -26,6 +26,9 @@ const (
 
 	// ScaledObjectFailedType is for event when creating ScaledObject failed
 	ScaledObjectFailedType CloudEventType = "keda.scaledobject.failed.v1"
+
+	// ScaledObjectFailedType is for event when removed ScaledObject
+	ScaledObjectRemovedType CloudEventType = "keda.scaledobject.removed.v1"
 )
 
 var AllEventTypes = []CloudEventType{ScaledObjectFailedType, ScaledObjectReadyType}

cmd/operator/main.go

@@ -223,7 +223,6 @@ func main() {
 	if err = (&kedacontrollers.ScaledObjectReconciler{
 		Client:       mgr.GetClient(),
 		Scheme:       mgr.GetScheme(),
-		Recorder:     eventRecorder,
 		ScaleClient:  scaleClient,
 		ScaleHandler: scaledHandler,
 		EventEmitter: eventEmitter,

controllers/keda/scaledobject_controller.go

@@ -34,7 +34,6 @@ import (
 	"k8s.io/apimachinery/pkg/types"
 	"k8s.io/client-go/scale"
 	"k8s.io/client-go/tools/cache"
-	"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"
@@ -70,7 +69,6 @@ import (
 type ScaledObjectReconciler struct {
 	Client       client.Client
 	Scheme       *runtime.Scheme
-	Recorder     record.EventRecorder
 	ScaleClient  scale.ScalesGetter
 	ScaleHandler scaling.ScaleHandler
 	EventEmitter eventemitter.EventHandler
@@ -119,8 +117,8 @@ func (r *ScaledObjectReconciler) SetupWithManager(mgr ctrl.Manager, options cont
 	if r.Scheme == nil {
 		return fmt.Errorf("ScaledObjectReconciler.Scheme is not initialized")
 	}
-	if r.Recorder == nil {
-		return fmt.Errorf("ScaledObjectReconciler.Recorder is not initialized")
+	if r.EventEmitter == nil {
+		return fmt.Errorf("ScaledObjectReconciler.EventEmitter is not initialized")
 	}
 	// Start controller
 	return ctrl.NewControllerManagedBy(mgr).
@@ -184,7 +182,7 @@ func (r *ScaledObjectReconciler) Reconcile(ctx context.Context, req ctrl.Request
 	if !scaledObject.Status.Conditions.AreInitialized() {
 		conditions := kedav1alpha1.GetInitializedConditions()
 		if err := kedastatus.SetStatusConditions(ctx, r.Client, reqLogger, scaledObject, conditions); err != nil {
-			r.EventEmitter.Emit(scaledObject, req.NamespacedName, corev1.EventTypeWarning, eventingv1alpha1.ScaledObjectFailedType, eventreason.ScaledObjectUpdateFailed, err.Error())
+			r.EventEmitter.Emit(scaledObject, req.NamespacedName.Namespace, corev1.EventTypeWarning, eventingv1alpha1.ScaledObjectFailedType, eventreason.ScaledObjectUpdateFailed, err.Error())
 			return ctrl.Result{}, err
 		}
 	}
@@ -196,18 +194,18 @@ func (r *ScaledObjectReconciler) Reconcile(ctx context.Context, req ctrl.Request
 		reqLogger.Error(err, msg)
 		conditions.SetReadyCondition(metav1.ConditionFalse, "ScaledObjectCheckFailed", msg)
 		conditions.SetActiveCondition(metav1.ConditionUnknown, "UnknownState", "ScaledObject check failed")
-		r.EventEmitter.Emit(scaledObject, req.NamespacedName, corev1.EventTypeWarning, eventingv1alpha1.ScaledObjectFailedType, eventreason.ScaledObjectCheckFailed, msg)
+		r.EventEmitter.Emit(scaledObject, req.NamespacedName.Namespace, corev1.EventTypeWarning, eventingv1alpha1.ScaledObjectFailedType, eventreason.ScaledObjectCheckFailed, msg)
 	} else {
 		wasReady := conditions.GetReadyCondition()
 		if wasReady.IsFalse() || wasReady.IsUnknown() {
-			r.EventEmitter.Emit(scaledObject, req.NamespacedName, corev1.EventTypeNormal, eventingv1alpha1.ScaledObjectReadyType, eventreason.ScaledObjectReady, message.ScalerReadyMsg)
+			r.EventEmitter.Emit(scaledObject, req.NamespacedName.Namespace, corev1.EventTypeNormal, eventingv1alpha1.ScaledObjectReadyType, eventreason.ScaledObjectReady, message.ScalerReadyMsg)
 		}
 		reqLogger.V(1).Info(msg)
 		conditions.SetReadyCondition(metav1.ConditionTrue, kedav1alpha1.ScaledObjectConditionReadySuccessReason, msg)
 	}
 
 	if err := kedastatus.SetStatusConditions(ctx, r.Client, reqLogger, scaledObject, &conditions); err != nil {
-		r.EventEmitter.Emit(scaledObject, req.NamespacedName, corev1.EventTypeWarning, eventingv1alpha1.ScaledObjectFailedType, eventreason.ScaledObjectUpdateFailed, err.Error())
+		r.EventEmitter.Emit(scaledObject, req.NamespacedName.Namespace, corev1.EventTypeWarning, eventingv1alpha1.ScaledObjectFailedType, eventreason.ScaledObjectUpdateFailed, err.Error())
 		return ctrl.Result{}, err
 	}
 
@@ -359,7 +357,7 @@ func (r *ScaledObjectReconciler) checkTargetResourceIsScalable(ctx context.Conte
 	if err != nil {
 		msg := "Failed to parse Group, Version, Kind, Resource"
 		logger.Error(err, msg, "apiVersion", scaledObject.Spec.ScaleTargetRef.APIVersion, "kind", scaledObject.Spec.ScaleTargetRef.Kind)
-		r.Recorder.Event(scaledObject, corev1.EventTypeWarning, eventreason.ScaledObjectUpdateFailed, msg)
+		r.EventEmitter.Emit(scaledObject, scaledObject.Namespace, corev1.EventTypeWarning, eventingv1alpha1.ScaledObjectFailedType, eventreason.ScaledObjectUpdateFailed, err.Error())
 		return gvkr, err
 	}
 	gvkString := gvkr.GVKString()
@@ -396,12 +394,12 @@ func (r *ScaledObjectReconciler) checkTargetResourceIsScalable(ctx context.Conte
 			if err := r.Client.Get(ctx, client.ObjectKey{Namespace: scaledObject.Namespace, Name: scaledObject.Spec.ScaleTargetRef.Name}, unstruct); err != nil {
 				// resource doesn't exist
 				logger.Error(err, message.ScaleTargetNotFoundMsg, "resource", gvkString, "name", scaledObject.Spec.ScaleTargetRef.Name)
-				r.Recorder.Event(scaledObject, corev1.EventTypeWarning, eventreason.ScaledObjectCheckFailed, message.ScaleTargetNotFoundMsg)
+				r.EventEmitter.Emit(scaledObject, scaledObject.Namespace, corev1.EventTypeWarning, eventingv1alpha1.ScaledObjectFailedType, eventreason.ScaledObjectCheckFailed, message.ScaleTargetNotFoundMsg)
 				return gvkr, err
 			}
 			// resource exist but doesn't expose /scale subresource
 			logger.Error(errScale, message.ScaleTargetNoSubresourceMsg, "resource", gvkString, "name", scaledObject.Spec.ScaleTargetRef.Name)
-			r.Recorder.Event(scaledObject, corev1.EventTypeWarning, eventreason.ScaledObjectCheckFailed, message.ScaleTargetNoSubresourceMsg)
+			r.EventEmitter.Emit(scaledObject, scaledObject.Namespace, corev1.EventTypeWarning, eventingv1alpha1.ScaledObjectFailedType, eventreason.ScaledObjectCheckFailed, message.ScaleTargetNoSubresourceMsg)
 			return gvkr, errScale
 		}
 		isScalableCache.Store(gr.String(), true)

controllers/keda/scaledobject_finalizer.go

@@ -24,8 +24,10 @@ import (
 	"k8s.io/apimachinery/pkg/api/errors"
 	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
 
+	eventingv1alpha1 "github.com/kedacore/keda/v2/apis/eventing/v1alpha1"
 	kedav1alpha1 "github.com/kedacore/keda/v2/apis/keda/v1alpha1"
 	"github.com/kedacore/keda/v2/controllers/keda/util"
+	"github.com/kedacore/keda/v2/pkg/common/message"
 	"github.com/kedacore/keda/v2/pkg/eventreason"
 )
 
@@ -86,7 +88,7 @@ func (r *ScaledObjectReconciler) finalizeScaledObject(ctx context.Context, logge
 	}
 
 	logger.Info("Successfully finalized ScaledObject")
-	r.Recorder.Event(scaledObject, corev1.EventTypeNormal, eventreason.ScaledObjectDeleted, "ScaledObject was deleted")
+	r.EventEmitter.Emit(scaledObject, scaledObject.Namespace, corev1.EventTypeWarning, eventingv1alpha1.ScaledObjectRemovedType, eventreason.ScaledObjectDeleted, message.ScaledObjectRemoved)
 	return nil
 }
 

controllers/keda/suite_test.go

@@ -94,7 +94,6 @@ var _ = BeforeSuite(func() {
 	err = (&ScaledObjectReconciler{
 		Client:       k8sManager.GetClient(),
 		Scheme:       k8sManager.GetScheme(),
-		Recorder:     k8sManager.GetEventRecorderFor("keda-operator"),
 		ScaleHandler: scaling.NewScaleHandler(k8sManager.GetClient(), scaleClient, k8sManager.GetScheme(), time.Duration(10), k8sManager.GetEventRecorderFor("keda-operator"), nil),
 		ScaleClient:  scaleClient,
 		EventEmitter: eventemitter.NewEventEmitter(k8sManager.GetClient(), k8sManager.GetEventRecorderFor("keda-operator"), "kubernetes-default", nil),

pkg/common/message/message.go

@@ -28,4 +28,6 @@ const (
 	ScaleTargetNotFoundMsg = "Target resource doesn't exist"
 
 	ScaleTargetNoSubresourceMsg = "Target resource doesn't expose /scale subresource"
+
+	ScaledObjectRemoved = "ScaledObject was deleted"
 )

pkg/eventemitter/eventemitter.go

@@ -73,7 +73,7 @@ type EventEmitter struct {
 type EventHandler interface {
 	DeleteCloudEventSource(cloudEventSource *eventingv1alpha1.CloudEventSource) error
 	HandleCloudEventSource(ctx context.Context, cloudEventSource *eventingv1alpha1.CloudEventSource) error
-	Emit(object runtime.Object, namesapce types.NamespacedName, eventType string, cloudeventType eventingv1alpha1.CloudEventType, reason string, message string)
+	Emit(object runtime.Object, namesapce string, eventType string, cloudeventType eventingv1alpha1.CloudEventType, reason string, message string)
 }
 
 // EventDataHandler defines the behavior for different event handlers
@@ -325,7 +325,7 @@ func (e *EventEmitter) checkEventHandlers(ctx context.Context, cloudEventSource
 }
 
 // Emit is emitting event to both local kubernetes and custom CloudEventSource handler. After emit event to local kubernetes, event will inqueue and waitng for handler's consuming.
-func (e *EventEmitter) Emit(object runtime.Object, namesapce types.NamespacedName, eventType string, cloudeventType eventingv1alpha1.CloudEventType, reason, message string) {
+func (e *EventEmitter) Emit(object runtime.Object, namesapce string, eventType string, cloudeventType eventingv1alpha1.CloudEventType, reason, message string) {
 	e.recorder.Event(object, eventType, reason, message)
 
 	e.eventHandlersCacheLock.RLock()
@@ -337,7 +337,7 @@ func (e *EventEmitter) Emit(object runtime.Object, namesapce types.NamespacedNam
 	objectName, _ := meta.NewAccessor().Name(object)
 	objectType, _ := meta.NewAccessor().Kind(object)
 	eventData := eventdata.EventData{
-		Namespace:      namesapce.Namespace,
+		Namespace:      namesapce,
 		CloudEventType: cloudeventType,
 		ObjectName:     strings.ToLower(objectName),
 		ObjectType:     strings.ToLower(objectType),

tests/internals/cloudevent_source/cloudevent_source_test.go

@@ -27,6 +27,7 @@ var _ = godotenv.Load("../../.env")
 var (
 	namespace                  = fmt.Sprintf("%s-ns", testName)
 	scaledObjectName           = fmt.Sprintf("%s-so", testName)
+	deploymentName             = fmt.Sprintf("%s-d", testName)
 	clientName                 = fmt.Sprintf("%s-client", testName)
 	cloudeventSourceName       = fmt.Sprintf("%s-ce", testName)
 	cloudeventSourceErrName    = fmt.Sprintf("%s-ce-err", testName)
@@ -43,6 +44,7 @@ var (
 type templateData struct {
 	TestNamespace              string
 	ScaledObject               string
+	DeploymentName             string
 	ClientName                 string
 	CloudEventSourceName       string
 	CloudeventSourceErrName    string
@@ -210,6 +212,56 @@ spec:
         excludedEventTypes:
         - keda.scaledobject.failed.v1
     `
+
+	deploymentTemplate = `
+apiVersion: apps/v1
+kind: Deployment
+metadata:
+  name: {{.DeploymentName}}
+  namespace: {{.TestNamespace}}
+  labels:
+    deploy: {{.DeploymentName}}
+spec:
+  replicas: 1
+  selector:
+    matchLabels:
+      pod: {{.DeploymentName}}
+  template:
+    metadata:
+      labels:
+        pod: {{.DeploymentName}}
+    spec:
+      containers:
+        - name: nginx
+          image: 'nginxinc/nginx-unprivileged'
+`
+
+	scaledObjectTemplate = `
+apiVersion: keda.sh/v1alpha1
+kind: ScaledObject
+metadata:
+  name: {{.ScaledObject}}
+  namespace: {{.TestNamespace}}
+spec:
+  scaleTargetRef:
+    name: {{.DeploymentName}}
+  pollingInterval: 5
+  cooldownPeriod: 5
+  minReplicaCount: 1
+  maxReplicaCount: 10
+  advanced:
+    horizontalPodAutoscalerConfig:
+      behavior:
+        scaleDown:
+          stabilizationWindowSeconds: 15
+  triggers:
+  - type: cron
+    metadata:
+      timezone: Etc/UTC
+      start: 3 * * * *
+      end: 5 * * * *
+      desiredReplicas: '4'
+`
 )
 
 func TestScaledObjectGeneral(t *testing.T) {
@@ -223,6 +275,7 @@ func TestScaledObjectGeneral(t *testing.T) {
 	assert.True(t, WaitForAllPodRunningInNamespace(t, kc, namespace, 5, 20), "all pods should be running")
 
 	testErrEventSourceEmitValue(t, kc, data)
+	testEventSourceEmitValue(t, kc, data)
 	testErrEventSourceExcludeValue(t, kc, data)
 	testErrEventSourceIncludeValue(t, kc, data)
 	testErrEventSourceCreation(t, kc, data)
@@ -258,8 +311,16 @@ func testErrEventSourceEmitValue(t *testing.T, _ *kubernetes.Clientset, data tem
 			foundEvents = append(foundEvents, cloudEvent)
 			data := map[string]string{}
 			err := cloudEvent.DataAs(&data)
+			t.Log("--- test emitting eventsource about scaledobject err---", "message", data["message"])
+
 			assert.NoError(t, err)
-			assert.Equal(t, data["message"], "ScaledObject doesn't have correct scaleTargetRef specification")
+			assert.Condition(t, func() bool {
+				if data["message"] == "ScaledObject doesn't have correct scaleTargetRef specification" || data["message"] == "Target resource doesn't exist" {
+					return true
+				}
+				return false
+			}, "get filtered event")
+
 			assert.Equal(t, cloudEvent.Type(), "keda.scaledobject.failed.v1")
 			assert.Equal(t, cloudEvent.Source(), expectedSource)
 			assert.Equal(t, cloudEvent.DataContentType(), "application/json")
@@ -272,6 +333,49 @@ func testErrEventSourceEmitValue(t *testing.T, _ *kubernetes.Clientset, data tem
 	assert.NotEmpty(t, foundEvents)
 }
 
+func testEventSourceEmitValue(t *testing.T, _ *kubernetes.Clientset, data templateData) {
+	t.Log("--- test emitting eventsource about scaledobject removed---")
+	KubectlApplyWithTemplate(t, data, "scaledObjectTemplate", scaledObjectTemplate)
+	KubectlApplyWithTemplate(t, data, "deploymentTemplate", deploymentTemplate)
+
+	// wait 15 seconds to ensure event propagation
+	time.Sleep(5 * time.Second)
+	KubectlDeleteWithTemplate(t, data, "scaledObjectTemplate", scaledObjectTemplate)
+	time.Sleep(10 * time.Second)
+
+	out, outErr, err := ExecCommandOnSpecificPod(t, clientName, namespace, fmt.Sprintf("curl -X GET %s/getCloudEvent/%s", cloudEventHTTPServiceURL, "ScaledObjectDeleted"))
+	assert.NotEmpty(t, out)
+	assert.Empty(t, outErr)
+	assert.NoError(t, err, "dont expect error requesting ")
+
+	cloudEvents := []cloudevents.Event{}
+	err = json.Unmarshal([]byte(out), &cloudEvents)
+
+	assert.NoError(t, err, "dont expect error unmarshaling the cloudEvents")
+	assert.Greater(t, len(cloudEvents), 0, "cloudEvents should have at least 1 item")
+
+	foundEvents := []cloudevents.Event{}
+
+	for _, cloudEvent := range cloudEvents {
+		if cloudEvent.Subject() == expectedSubject {
+			foundEvents = append(foundEvents, cloudEvent)
+			data := map[string]string{}
+			err := cloudEvent.DataAs(&data)
+
+			assert.NoError(t, err)
+			assert.Equal(t, data["message"], "ScaledObject was deleted")
+			assert.Equal(t, cloudEvent.Type(), "keda.scaledobject.removed.v1")
+			assert.Equal(t, cloudEvent.Source(), expectedSource)
+			assert.Equal(t, cloudEvent.DataContentType(), "application/json")
+
+			if lastCloudEventTime.Before(cloudEvent.Time()) {
+				lastCloudEventTime = cloudEvent.Time()
+			}
+		}
+	}
+	assert.NotEmpty(t, foundEvents)
+}
+
 // tests error events not emitted by
 func testErrEventSourceExcludeValue(t *testing.T, _ *kubernetes.Clientset, data templateData) {
 	t.Log("--- test emitting eventsource about scaledobject err with exclude filter---")
@@ -362,6 +466,7 @@ func getTemplateData() (templateData, []Template) {
 	return templateData{
 			TestNamespace:              namespace,
 			ScaledObject:               scaledObjectName,
+			DeploymentName:             deploymentName,
 			ClientName:                 clientName,
 			CloudEventSourceName:       cloudeventSourceName,
 			CloudeventSourceErrName:    cloudeventSourceErrName,