我正在寻找一种方法将kombu用作Tornado-SockJS和Django应用服务器之间的消息队列适配器。我已经尝试了以下代码:
class BrokerClient(ConsumerMixin):
clients = []
def __init__(self):
self.connection = BrokerConnection(settings.BROKER_URL)
self.io_loop = ioloop.IOLoop.instance()
self.queue = sockjs_queue
self._handle_loop()
@staticmethod
def instance():
if not hasattr(BrokerClient, '_instance'):
BrokerClient._instance = BrokerClient()
return BrokerClient._instance
def add_client(self, client):
self.clients.append(client)
def remove_client(self, client):
self.clients.remove(client)
def _handle_loop(self):
try:
if self.restart_limit.can_consume(1):
for _ in self.consume(limit=5):
pass
except self.connection.connection_errors:
print ('Connection to broker lost. '
'Trying to re-establish the connection...')
self.io_loop.add_timeout(datetime.timedelta(0.0001), self._handle_loop)
def get_consumers(self, Consumer, channel):
return [Consumer([self.queue, ], callbacks=[self.process_task])]
def process_task(self, body, message):
for client in self.clients:
if hasattr(body, 'users') and client.user.pk in body.users:
client.send(body)
message.ack()
但是龙卷风在_handle_loop执行时被阻止了(正如预期的那样)。
有没有什么办法可以防止这种情况发生?
我知道Pika库适配器适用于Tornado,但我想使用kombu,因为它已经在项目中使用,并且具有灵活的传输方式。
更新:
将_handle_loop更改为生成器函数。
def drain_events(self, callback):
with self.Consumer() as (connection, channel, consumers):
with self.extra_context(connection, channel):
try:
connection.drain_events(timeout=1)
except:
pass
callback(None)
@tornado.gen.engine
def _handle_loop(self):
response = yield tornado.gen.Task(self.drain_events)
self.io_loop.add_timeout(datetime.timedelta(0.0001), self._handle_loop)