ETs reference subscriptions/triggers on reply

cmd/broker/filter/main.go

@@ -42,9 +42,12 @@ import (
 	"knative.dev/eventing/pkg/apis/feature"
 	"knative.dev/eventing/pkg/auth"
 	"knative.dev/eventing/pkg/broker/filter"
+	eventingclient "knative.dev/eventing/pkg/client/injection/client"
 	brokerinformer "knative.dev/eventing/pkg/client/injection/informers/eventing/v1/broker"
 	triggerinformer "knative.dev/eventing/pkg/client/injection/informers/eventing/v1/trigger"
+	eventtypeinformer "knative.dev/eventing/pkg/client/injection/informers/eventing/v1beta2/eventtype"
 	"knative.dev/eventing/pkg/eventingtls"
+	"knative.dev/eventing/pkg/eventtype"
 	"knative.dev/eventing/pkg/reconciler/names"
 )
 
@@ -114,7 +117,22 @@ func main() {
 	// Watch the observability config map and dynamically update request logs.
 	configMapWatcher.Watch(logging.ConfigMapName(), logging.UpdateLevelFromConfigMap(sl, atomicLevel, component))
 
-	featureStore := feature.NewStore(logging.FromContext(ctx).Named("feature-config-store"))
+	var featureStore *feature.Store
+	var handler *filter.Handler
+
+	featureStore = feature.NewStore(logging.FromContext(ctx).Named("feature-config-store"), func(name string, value interface{}) {
+		featureFlags := value.(feature.Flags)
+		if featureFlags.IsEnabled(feature.EvenTypeAutoCreate) && featureStore != nil && handler != nil {
+			autoCreate := &eventtype.EventTypeAutoHandler{
+				EventTypeLister: eventtypeinformer.Get(ctx).Lister(),
+				EventingClient:  eventingclient.Get(ctx).EventingV1beta2(),
+				FeatureStore:    featureStore,
+				Logger:          logger,
+			}
+			handler.EventTypeCreator = autoCreate
+		}
+
+	})
 	featureStore.WatchConfigs(configMapWatcher)
 
 	// Decorate contexts with the current state of the feature config.
@@ -135,7 +153,7 @@ func main() {
 	// the messages to the triggers' subscribers) in this binary.
 	oidcTokenVerifier := auth.NewOIDCTokenVerifier(ctx)
 	trustBundleConfigMapInformer := configmapinformer.Get(ctx, eventingtls.TrustBundleLabelSelector).Lister().ConfigMaps(system.Namespace())
-	handler, err := filter.NewHandler(logger, oidcTokenVerifier, oidcTokenProvider, triggerinformer.Get(ctx), brokerinformer.Get(ctx), reporter, trustBundleConfigMapInformer, ctxFunc)
+	handler, err = filter.NewHandler(logger, oidcTokenVerifier, oidcTokenProvider, triggerinformer.Get(ctx), brokerinformer.Get(ctx), reporter, trustBundleConfigMapInformer, ctxFunc)
 	if err != nil {
 		logger.Fatal("Error creating Handler", zap.Error(err))
 	}

config/brokers/mt-channel-broker/roles/filter-clusterrole.yaml

@@ -44,3 +44,12 @@ rules:
       - "serviceaccounts/token"
     verbs:
       - create
+  - apiGroups:
+    - "eventing.knative.dev"
+    resources:
+    - "eventtypes"
+    verbs:
+      - "get"
+      - "list"
+      - "watch"
+      - "create"

config/channels/in-memory-channel/resources/in-memory-channel.yaml

@@ -136,6 +136,12 @@ spec:
                       description: Generation of the origin of the subscriber with uid:UID.
                       type: integer
                       format: int64
+                    name:
+                      description: The name of the subscription
+                      type: string
+                    namespace:
+                      description: The namespace of the subscription
+                      type: string
                     replyUri:
                       description: ReplyURI is the endpoint for the reply
                       type: string

config/core/resources/channel.yaml

@@ -158,6 +158,9 @@ spec:
                       description: Generation of the origin of the subscriber with uid:UID.
                       type: integer
                       format: int64
+                    name:
+                      description: The name of the subscription
+                      type: string
                     replyUri:
                       description: ReplyURI is the endpoint for the reply
                       type: string

docs/eventing-api.md

@@ -625,6 +625,18 @@ section of the resource.</p>
 <tbody>
 <tr>
 <td>
+<code>name</code><br/>
+<em>
+string
+</em>
+</td>
+<td>
+<em>(Optional)</em>
+<p>Name is used to identify the original subscription object.</p>
+</td>
+</tr>
+<tr>
+<td>
 <code>uid</code><br/>
 <em>
 <a href="https://godoc.org/k8s.io/apimachinery/pkg/types#UID">

go.mod

@@ -112,6 +112,7 @@ require (
 	github.com/russross/blackfriday/v2 v2.1.0 // indirect
 	github.com/spf13/cobra v1.7.0 // indirect
 	github.com/spf13/pflag v1.0.5 // indirect
+	github.com/valyala/bytebufferpool v1.0.0 // indirect
 	go.opentelemetry.io/contrib/instrumentation/google.golang.org/grpc/otelgrpc v0.49.0 // indirect
 	go.opentelemetry.io/contrib/instrumentation/net/http/otelhttp v0.49.0 // indirect
 	go.opentelemetry.io/otel/metric v1.24.0 // indirect

pkg/apis/duck/v1/subscribable_types.go

@@ -35,6 +35,9 @@ var _ duck.Implementable = (*Subscribable)(nil)
 //
 // At least one of SubscriberURI and ReplyURI must be present
 type SubscriberSpec struct {
+	// Name is used to identify the original subscription object.
+	// +optional
+	Name *string `json:"name,omitempty"`
 	// UID is used to understand the origin of the subscriber.
 	// +optional
 	UID types.UID `json:"uid,omitempty"`

pkg/broker/filter/filter_handler.go

@@ -52,6 +52,7 @@ import (
 	"knative.dev/eventing/pkg/eventfilter"
 	"knative.dev/eventing/pkg/eventfilter/attributes"
 	"knative.dev/eventing/pkg/eventfilter/subscriptionsapi"
+	"knative.dev/eventing/pkg/eventtype"
 	"knative.dev/eventing/pkg/kncloudevents"
 	"knative.dev/eventing/pkg/reconciler/sugar/trigger/path"
 	"knative.dev/eventing/pkg/tracing"
@@ -78,12 +79,13 @@ type Handler struct {
 
 	eventDispatcher *kncloudevents.Dispatcher
 
-	triggerLister eventinglisters.TriggerLister
-	brokerLister  eventinglisters.BrokerLister
-	logger        *zap.Logger
-	withContext   func(ctx context.Context) context.Context
-	filtersMap    *subscriptionsapi.FiltersMap
-	tokenVerifier *auth.OIDCTokenVerifier
+	triggerLister    eventinglisters.TriggerLister
+	brokerLister     eventinglisters.BrokerLister
+	logger           *zap.Logger
+	withContext      func(ctx context.Context) context.Context
+	filtersMap       *subscriptionsapi.FiltersMap
+	tokenVerifier    *auth.OIDCTokenVerifier
+	EventTypeCreator *eventtype.EventTypeAutoHandler
 }
 
 // NewHandler creates a new Handler and its associated EventReceiver.
@@ -367,6 +369,19 @@ func (h *Handler) send(ctx context.Context, writer http.ResponseWriter, headers
 		kncloudevents.WithHeader(additionalHeaders),
 	}
 
+	if h.EventTypeCreator != nil {
+		opts = append(opts, kncloudevents.WithEventTypeAutoHandler(
+			h.EventTypeCreator,
+			&duckv1.KReference{
+				Name:       t.Name,
+				Namespace:  t.Namespace,
+				APIVersion: eventingv1.SchemeGroupVersion.String(),
+				Kind:       "Trigger",
+			},
+			t.UID,
+		))
+	}
+
 	if t.Status.Auth != nil && t.Status.Auth.ServiceAccountName != nil {
 		opts = append(opts, kncloudevents.WithOIDCAuthentication(&types.NamespacedName{
 			Name:      *t.Status.Auth.ServiceAccountName,

pkg/channel/fanout/fanout_event_handler.go

@@ -36,6 +36,7 @@ import (
 
 	"knative.dev/eventing/pkg/apis"
 	eventingduckv1 "knative.dev/eventing/pkg/apis/duck/v1"
+	messagingv1 "knative.dev/eventing/pkg/apis/messaging/v1"
 	"knative.dev/eventing/pkg/channel"
 	"knative.dev/eventing/pkg/eventtype"
 	"knative.dev/eventing/pkg/kncloudevents"
@@ -51,6 +52,9 @@ type Subscription struct {
 	DeadLetter     *duckv1.Addressable
 	RetryConfig    *kncloudevents.RetryConfig
 	ServiceAccount *types.NamespacedName
+	Name           string
+	Namespace      string
+	UID            types.UID
 }
 
 // Config for a fanout.EventHandler.
@@ -167,7 +171,13 @@ func SubscriberSpecToFanoutConfig(sub eventingduckv1.SubscriberSpec) (*Subscript
 		}
 	}
 
-	return &Subscription{Subscriber: destination, Reply: reply, DeadLetter: deadLetter, RetryConfig: retryConfig}, nil
+	s := &Subscription{Subscriber: destination, Reply: reply, DeadLetter: deadLetter, RetryConfig: retryConfig, UID: sub.UID}
+
+	if sub.Name != nil {
+		s.Name = *sub.Name
+	}
+
+	return s, nil
 }
 
 func (f *FanoutEventHandler) SetSubscriptions(ctx context.Context, subs []Subscription) {
@@ -361,6 +371,19 @@ func (f *FanoutEventHandler) makeFanoutRequest(ctx context.Context, event event.
 		kncloudevents.WithRetryConfig(sub.RetryConfig),
 	}
 
+	if f.eventTypeHandler != nil && sub.Name != "" && sub.Namespace != "" && sub.UID != types.UID("") {
+		dispatchOptions = append(dispatchOptions, kncloudevents.WithEventTypeAutoHandler(
+			f.eventTypeHandler,
+			&duckv1.KReference{
+				Name:       sub.Name,
+				Namespace:  sub.Namespace,
+				APIVersion: messagingv1.SchemeGroupVersion.String(),
+				Kind:       "Subscription",
+			},
+			sub.UID,
+		))
+	}
+
 	if sub.ServiceAccount != nil {
 		dispatchOptions = append(dispatchOptions, kncloudevents.WithOIDCAuthentication(sub.ServiceAccount))
 	}

pkg/kncloudevents/event_dispatcher.go

@@ -28,6 +28,7 @@ import (
 
 	cloudevents "github.com/cloudevents/sdk-go/v2"
 	"github.com/cloudevents/sdk-go/v2/binding"
+	"github.com/cloudevents/sdk-go/v2/binding/buffering"
 	"github.com/cloudevents/sdk-go/v2/event"
 	cehttp "github.com/cloudevents/sdk-go/v2/protocol/http"
 	"github.com/hashicorp/go-retryablehttp"
@@ -42,6 +43,7 @@ import (
 	eventingapis "knative.dev/eventing/pkg/apis"
 	"knative.dev/eventing/pkg/auth"
 	"knative.dev/eventing/pkg/eventingtls"
+	"knative.dev/eventing/pkg/eventtype"
 	"knative.dev/eventing/pkg/utils"
 
 	"knative.dev/eventing/pkg/broker"
@@ -115,13 +117,29 @@ func WithOIDCAuthentication(serviceAccount *types.NamespacedName) SendOption {
 	}
 }
 
+func WithEventTypeAutoHandler(handler *eventtype.EventTypeAutoHandler, ref *duckv1.KReference, ownerUID types.UID) SendOption {
+	return func(sc *senderConfig) error {
+		if handler != nil && (ref == nil || ownerUID == types.UID("")) {
+			return fmt.Errorf("addressable and ownerUID must be provided if using the eventtype auto handler")
+		}
+		sc.eventTypeAutoHandler = handler
+		sc.eventTypeRef = ref
+		sc.eventTypeOnwerUID = ownerUID
+
+		return nil
+	}
+}
+
 type senderConfig struct {
-	reply              *duckv1.Addressable
-	deadLetterSink     *duckv1.Addressable
-	additionalHeaders  http.Header
-	retryConfig        *RetryConfig
-	transformers       binding.Transformers
-	oidcServiceAccount *types.NamespacedName
+	reply                *duckv1.Addressable
+	deadLetterSink       *duckv1.Addressable
+	additionalHeaders    http.Header
+	retryConfig          *RetryConfig
+	transformers         binding.Transformers
+	oidcServiceAccount   *types.NamespacedName
+	eventTypeAutoHandler *eventtype.EventTypeAutoHandler
+	eventTypeRef         *duckv1.KReference
+	eventTypeOnwerUID    types.UID
 }
 
 type Dispatcher struct {
@@ -229,6 +247,10 @@ func (d *Dispatcher) send(ctx context.Context, message binding.Message, destinat
 
 	messagesToFinish = append(messagesToFinish, responseMessage)
 
+	if config.eventTypeAutoHandler != nil {
+		d.handleAutocreate(ctx, responseMessage, config)
+	}
+
 	if config.reply == nil {
 		return dispatchExecutionInfo, nil
 	}
@@ -332,6 +354,22 @@ func (d *Dispatcher) executeRequest(ctx context.Context, target duckv1.Addressab
 	return ctx, responseMessage, &dispatchInfo, nil
 }
 
+func (d *Dispatcher) handleAutocreate(ctx context.Context, responseMessage binding.Message, config *senderConfig) {
+	// messages can only be read once, so we need to make a copy of it
+	messageCopy, err := buffering.CopyMessage(ctx, responseMessage)
+	if err != nil {
+		return
+	}
+	defer responseMessage.Finish(nil)
+
+	responseEvent, err := binding.ToEvent(ctx, messageCopy)
+	if err != nil {
+		return
+	}
+
+	config.eventTypeAutoHandler.AutoCreateEventType(ctx, responseEvent, config.eventTypeRef, config.eventTypeOnwerUID)
+}
+
 func (d *Dispatcher) createRequest(ctx context.Context, message binding.Message, target duckv1.Addressable, additionalHeaders http.Header, oidcServiceAccount *types.NamespacedName, transformers ...binding.Transformer) (*http.Request, error) {
 	request, err := http.NewRequestWithContext(ctx, "POST", target.URL.String(), nil)
 	if err != nil {

pkg/reconciler/inmemorychannel/dispatcher/inmemorychannel.go

@@ -230,15 +230,18 @@ func newConfigForInMemoryChannel(ctx context.Context, imc *v1.InMemoryChannel) (
 
 	for i, sub := range imc.Spec.Subscribers {
 		conf, err := fanout.SubscriberSpecToFanoutConfig(sub)
+		if err != nil {
+			return nil, err
+		}
+
+		conf.Namespace = imc.Namespace
 		if isOIDCEnabled {
 			conf.ServiceAccount = &types.NamespacedName{
 				Name:      *sub.Auth.ServiceAccountName,
 				Namespace: imc.Namespace,
 			}
 		}
-		if err != nil {
-			return nil, err
-		}
+
 		subs[i] = *conf
 	}