Working with Python, Twisted, Redis and txredisapi.
建立连接后,如何获取订阅和取消订阅频道的订阅者协议?
我想我需要获取订阅者协议的实例,然后我可以使用"订阅"和"取消订阅"方法,但不知道如何获取它。
代码示例:
import txredisapi as redis
class RedisListenerProtocol(redis.SubscriberProtocol):
def connectionMade(self):
self.subscribe("channelName")
def messageReceived(self, pattern, channel, message):
print "pattern=%s, channel=%s message=%s" %(pattern, channel, message)
def connectionLost(self, reason):
print "lost connection:", reason
class RedisListenerFactory(redis.SubscriberFactory):
maxDelay = 120
continueTrying = True
protocol = RedisListenerProtocol
然后从这些类之外:
# I need to sub/unsub from here! (not from inside de protocol)
protocolInstance = RedisListenerProtocol # Here is the problem
protocolInstance.subscribe("newChannelName")
protocolInstance.unsubscribe("channelName")
有什么建议吗?
谢谢!
下一个代码解决了这个问题:
@defer.inlineCallbacks
def subUnsub():
deferred = yield ClientCreator(reactor, RedisListenerProtocol).connectTCP(HOST, PORT)
deferred.subscribe("newChannelName")
deferred.unsubscribe("channelName")
解释:使用"ClientCreator"在带有标志"@defer.inlineCallbacks"的函数中获取SubscriberProtocol的实例,并且不要忘记等待完成延迟数据的"yield"关键字。然后,您可以使用此延迟来取消订阅。
就我而言,我忘记了 yield 关键字,因此延迟不完整,并且 suscribe 和取消订阅方法不起作用。
connecting = ClientCreator(reactor, RedisListenerProtocol).connectTCP(HOST, PORT)
def connected(listener):
listener.subscribe("newChannelName")
listener.unsubscribe("channelName")
connecting.addCallback(connected)