113 lines
3.6 KiB
Python
113 lines
3.6 KiB
Python
"""
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Standalone worker: слушает очередь RabbitMQ 'ticket_events',
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генерирует PDF-билет через core.pdf_generator, загружает в MinIO,
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сохраняет pdf_url в PostgreSQL.
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"""
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import asyncio
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import json
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import logging
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import os
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from typing import Any
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import aio_pika
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from sqlalchemy import select
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from sqlalchemy.ext.asyncio import AsyncSession, async_sessionmaker, create_async_engine
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from core.minio import ensure_bucket_exists, upload_pdf
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from core.pdf_generator import generate_qr_ticket
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from database.models import Ticket
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logging.basicConfig(
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level=logging.INFO,
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format="%(asctime)s [%(levelname)s] %(name)s: %(message)s",
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)
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log = logging.getLogger("worker")
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RABBITMQ_URL: str = os.getenv("RABBITMQ_URL", "amqp://user:password@rabbitmq/")
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DATABASE_URL: str = os.getenv(
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"DATABASE_URL",
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"postgresql+asyncpg://admin:your_strong_password@postgres:5432/ticket_db",
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)
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QUEUE_NAME: str = "ticket_events"
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async def _handle_ticket_paid(
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payload: dict[str, Any],
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db_session: AsyncSession,
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) -> None:
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ticket_id: int | None = payload.get("ticket_id")
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if ticket_id is None:
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log.error("Event 'ticket_paid' missing 'ticket_id': %s", payload)
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return
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result = await db_session.execute(select(Ticket).where(Ticket.id == ticket_id))
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ticket: Ticket | None = result.scalar_one_or_none()
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if ticket is None:
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log.error("Ticket %s not found in DB", ticket_id)
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return
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if ticket.pdf_url:
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log.info("Ticket %s already has a PDF, skipping (idempotency guard)", ticket_id)
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return
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log.info("Generating PDF for ticket %s …", ticket_id)
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pdf_bytes = generate_qr_ticket(
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ticket_id=ticket.id,
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user_id=ticket.user_id or 0,
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seat_id=ticket.seat_id,
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)
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object_name = f"tickets/ticket_{ticket_id}.pdf"
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pdf_url = await upload_pdf(object_name, pdf_bytes)
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log.info("PDF uploaded: %s", pdf_url)
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ticket.pdf_url = pdf_url
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await db_session.commit()
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log.info("Ticket %s updated with pdf_url", ticket_id)
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async def _process_message(
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message: aio_pika.abc.AbstractIncomingMessage,
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session_factory: async_sessionmaker[AsyncSession],
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) -> None:
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async with message.process(requeue=True):
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try:
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payload: dict[str, Any] = json.loads(message.body)
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action: str = payload.get("action", "")
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if action == "ticket_paid":
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async with session_factory() as session:
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await _handle_ticket_paid(payload, session)
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else:
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log.debug("Unknown action '%s', skipping", action)
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except json.JSONDecodeError:
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log.exception("Failed to decode message body: %r", message.body)
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# Некорректный JSON — не возвращаем в очередь (requeue=False через reject)
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await message.reject(requeue=False)
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async def main() -> None:
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engine = create_async_engine(DATABASE_URL, echo=False)
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session_factory = async_sessionmaker(engine, expire_on_commit=False, class_=AsyncSession)
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await ensure_bucket_exists()
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log.info("MinIO bucket ready")
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connection = await aio_pika.connect_robust(RABBITMQ_URL)
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async with connection:
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channel = await connection.channel()
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await channel.set_qos(prefetch_count=10)
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queue = await channel.declare_queue(QUEUE_NAME, durable=True)
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log.info("Worker started. Listening on queue '%s' …", QUEUE_NAME)
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async with queue.iterator() as queue_iter:
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async for message in queue_iter:
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await _process_message(message, session_factory)
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if __name__ == "__main__":
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asyncio.run(main())
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