我让Kombu处理 rabbitmq 队列并调用 django 函数/管理命令等。我的问题是我对正确的执行顺序有绝对要求。在 message1 和 2 的处理程序完成之前，消息 3 的处理程序永远无法运行。在完成处理前一条消息之前，我需要确保 Kombu 不处理另一条消息：
考虑这个基类
class UpdaterMixin(object):
# binding management commands to event names
# override in subclass
event_handlers = {}
app_name = '' #override in subclass
def __init__(self):
if not self.app_name or len(self.event_handlers) == 0:
print('app_name or event_handlers arent implemented')
raise NotImplementedError()
else:
self.connection_url = settings.BROKER_URL
self.exchange_name = settings.BUS_SETTINGS['exchange_name']
self.exchange_type = settings.BUS_SETTINGS['exchange_type']
self.routing_key = settings.ROUTING_KEYS[self.app_name]
def start_listener(self):
logger.info('started %s updater listener' % self.app_name)\\
with Connection(self.connection_url) as connection:
exchange = Exchange(self.exchange_name, self.exchange_type, durable=True)
queue = Queue('%s_updater' % self.app_name, exchange=exchange, routing_key=self.routing_key)
with connection.Consumer(queue, callbacks=[self.process_message]) as consumer:
while True:
logger.info('Consuming events')
connection.drain_events()
def process_message(self, body, message):
logger.info('data received: %s' % body)
handler = self.event_handlers[body['event']]
logger.info('Executing management command: %s' % str(handler))
data = json.dumps(body)
call_command(handler, data, verbosity=3, interactive=False)
message.ack()
有没有办法强制kombu进行这种行为？我不在乎锁是否会在处理完成之前不会耗尽另一个事件process_message，或者在前一个事件完成之前不会运行另一个事件，或者任何其他方法来实现这一点。我只需要确保严格维护执行顺序。
我会很高兴在这方面有任何帮助。