test

catalog/consumer.go

@@ -12,9 +12,13 @@ package catalog
 // docs/plan-projectionstore-generalization.md for why the split exists.
 
 import (
+	"encoding/json"
+	"fmt"
 	"time"
 
+	"git.k6n.net/mats/platform/event"
 	"git.k6n.net/mats/platform/projection"
+	amqp "github.com/rabbitmq/amqp091-go"
 )
 
 // Generic machinery, re-exported under their historical catalog names. These
@@ -97,3 +101,28 @@ func decodeProjectionUpdates(payload []byte) ([]projection.Update[Projection], e
 	}
 	return out, nil
 }
+
+// MakeAmqpHandler returns a RabbitMQ delivery handler that wraps a ProjectionStore[T].
+// It decodes the event.Event envelope, recovers from panics, and applies the frame to the store.
+func MakeAmqpHandler[T any](store *ProjectionStore[T]) func(amqp.Delivery) error {
+	return func(d amqp.Delivery) (err error) {
+		defer func() {
+			if r := recover(); r != nil {
+				err = fmt.Errorf("projection handler panic recovered: %v", r)
+			}
+		}()
+		var ev event.Event
+		if err := json.Unmarshal(d.Body, &ev); err != nil {
+			return fmt.Errorf("decode event envelope: %w", err)
+		}
+		if err := store.HandleFrame(ev.Meta, ev.Payload); err != nil {
+			return fmt.Errorf("apply projection frame: %w", err)
+		}
+		return nil
+	}
+}
+
+// HandleEvent feeds an already-decoded event.Event directly into the projection store.
+func HandleEvent[T any](store *ProjectionStore[T], ev event.Event) error {
+	return store.HandleFrame(ev.Meta, ev.Payload)
+}