Refactor code structure for improved readability and maintainability

app/consumer.py

@@ -0,0 +1,40 @@
+import logging
+
+from faststream import FastStream
+from faststream.exceptions import RejectMessage
+from faststream.rabbit import RabbitBroker
+
+from app.config import settings
+from app.db import close_database, session_factory
+from app.messaging import PAYMENTS_EXCHANGE, PAYMENTS_QUEUE, declare_topology
+from app.processing import PaymentGateway, PaymentProcessor, WebhookClient
+from app.schemas import PaymentCreatedEvent
+
+logger = logging.getLogger(__name__)
+broker = RabbitBroker(settings.rabbitmq_url, graceful_timeout=30.0)
+app = FastStream(broker)
+processor = PaymentProcessor(
+    session_factory,
+    PaymentGateway(settings),
+    WebhookClient(settings.webhook_timeout),
+    settings,
+)
+
+
+@broker.subscriber(PAYMENTS_QUEUE, PAYMENTS_EXCHANGE)
+async def handle_payment(event: PaymentCreatedEvent) -> None:
+    try:
+        await processor.process(event)
+    except Exception as exc:
+        logger.exception("Payment %s exhausted all processing attempts", event.payment_id)
+        raise RejectMessage() from exc
+
+
+@app.after_startup
+async def setup_topology() -> None:
+    await declare_topology(broker)
+
+
+@app.after_shutdown
+async def shutdown_database() -> None:
+    await close_database()