Chill-project/sign-pdf-worker
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Fix infinite retry loop on signing errors in worker

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Catch SigningError separately (logged at ERROR level) and fix the ack/nack
logic so failed messages are requeued once then discarded, instead of being
requeued indefinitely or lost. Remove the bare `raise e` that crashed the
worker after each error.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
This commit is contained in:
Julien Fastré
2026-05-20 15:36:54 +02:00
parent 083bf20be7
commit dadf3d72e3
1 changed files with 15 additions and 8 deletions
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pythonProject/worker.py
+15 -8
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@@ -5,6 +5,7 @@ import os
import pika
import sign
from pyhanko.sign.general import SigningError
LOG_FORMAT = ('%(levelname) -10s %(asctime)s %(name) -30s %(funcName) '
'-35s %(lineno) -5d: %(message)s')
@@ -67,16 +68,22 @@ def on_message(channel, method_frame, header_frame, body):
LOGGER.debug("signed file resend to amqp")
channel.basic_ack(delivery_tag=method_frame.delivery_tag)
except Exception as e:
LOGGER.warning(f"error encountered while signing: {e}")
except SigningError as e:
LOGGER.error(f"signing error for signatureId {body_content['signatureId']}: {e}", exc_info=True)
if method_frame.redelivered:
LOGGER.warning(
f"stopping handling this message, because the message is already redelivered, signatureId: {body_content['signatureId']}")
channel.basic_reject(delivery_tag=method_frame.delivery_tag, requeue=True)
LOGGER.error(f"message already redelivered, discarding signatureId: {body_content['signatureId']}")
channel.basic_reject(delivery_tag=method_frame.delivery_tag, requeue=False)
else:
LOGGER.warning(f"first try failed, signatureId: {body_content['signatureId']}")
channel.basic_ack(delivery_tag=method_frame.delivery_tag)
raise e
LOGGER.warning(f"first try failed, requeueing for one retry, signatureId: {body_content['signatureId']}")
channel.basic_nack(delivery_tag=method_frame.delivery_tag, requeue=True)
except Exception as e:
LOGGER.warning(f"error encountered while signing, signatureId: {body_content['signatureId']}: {e}", exc_info=True)
if method_frame.redelivered:
LOGGER.warning(f"message already redelivered, discarding signatureId: {body_content['signatureId']}")
channel.basic_reject(delivery_tag=method_frame.delivery_tag, requeue=False)
else:
LOGGER.warning(f"first try failed, requeueing for one retry, signatureId: {body_content['signatureId']}")
channel.basic_nack(delivery_tag=method_frame.delivery_tag, requeue=True)
if __name__ == '__main__':