def _on_message(self, handler: type, queue: str, msg: amqpstorm.Message):
self._logger.info("Received Message from %s." % queue)
payload = msg.body
# If the message is of a known Content-Type, decode it automatically.
if msg.content_type == "application/json":
payload = Message.from_json(msg.body)
self._logger.debug("Message Content: %s" % str(payload))
try:
self._logger.debug("Dispatching message to %s." % handler.__name__)
self._logger.info(self._injector)
impl = self._injector.get(handler)
assert isinstance(impl, Handler)
impl.handle_message(payload)
self._logger.info("%s completed without error, ACKing message." %
handler.__name__)
msg.ack()
except RollbackException as e:
self._logger.info("%s failed: %s." % (handler.__name__, str(e)))
self._logger.info("%s failed, Rolling back..." % handler.__name__)
if e.rollback_strategy == RollbackStrategy.NONE:
raise
elif e.rollback_strategy == RollbackStrategy.RETRY_NOW:
msg.nack(requeue=True)
elif e.rollback_strategy == RollbackStrategy.RETRY_LATER:
msg.reject(requeue=True)
elif e.rollback_strategy == RollbackStrategy.QUARANTINE:
raise NotImplementedError("RollbackStrategy.QUARANTINE")
else:
raise Exception("no rollback stragy")
except Exception as e:
self._logger.info("%s failed: %s." % (handler.__name__, str(e)))
msg.reject(requeue=True)
