Update project 3 iteration feat: core booking pipeline, webhook and async pdf worker CORE COPLETE

backend/core/rabbitmq.py

@@ -0,0 +1,34 @@
+import json
+import os
+
+import aio_pika
+
+RABBITMQ_URL: str = os.getenv("RABBITMQ_URL", "amqp://user:password@rabbitmq/")
+QUEUE_NAME: str = "ticket_events"
+
+
+async def publish_ticket_paid_event(ticket_id: int, user_id: int) -> None:
+    """Публикует событие ticket_paid в очередь RabbitMQ.
+
+    Формат совпадает с тем, что ожидает worker.py:
+    {"action": "ticket_paid", "ticket_id": <int>, "user_id": <int>}
+    """
+    connection = await aio_pika.connect_robust(RABBITMQ_URL)
+    async with connection:
+        channel = await connection.channel()
+
+        # durable=True — очередь переживёт перезапуск брокера
+        queue = await channel.declare_queue(QUEUE_NAME, durable=True)
+
+        body = json.dumps(
+            {"action": "ticket_paid", "ticket_id": ticket_id, "user_id": user_id}
+        ).encode()
+
+        await channel.default_exchange.publish(
+            aio_pika.Message(
+                body=body,
+                delivery_mode=aio_pika.DeliveryMode.PERSISTENT,
+                content_type="application/json",
+            ),
+            routing_key=queue.name,
+        )