python - 使用 Twisted 阻止 Thrift 调用

Question

我有一个使用 TTwisted 协议(protocol)的 Twisted/Thrift 服务器。我希望保持与客户端的连接打开，直到发生给定事件(Twisted react 器通过回调通知我此事件)。

class ServiceHandler(object):
    interface.implements(Service.Iface)

    def listenForEvent(self):
        """
        A method defined in my Thrift interface that should block the Thrift
        response until my event of interest occurs.
        """
        # I need to somehow return immediately to free up the reactor thread,
        # but I don't want the Thrift call to be considered completed. The current
        # request needs to be marked as "waiting" somehow.

    def handleEvent(self):
        """
        A method called when the event of interest occurs. It is a callback method
        registered with the Twisted reactor.
        """
        # Find all the "waiting" requests and notify them that the event occurred.
        # This will cause all of the Thrift requests to complete.

如何快速从处理程序对象的方法返回，同时保持阻塞 Thrift 调用的错觉？

<小时/>

我从 Twisted 启动触发器初始化 Thrift 处理程序:

def on_startup():
    handler = ServiceHandler()                      
    processor = Service.Processor(handler)                                   
    server = TTwisted.ThriftServerFactory(processor=processor,                  
        iprot_factory=TBinaryProtocol.TBinaryProtocolFactory())                 
    reactor.listenTCP(9160, server)

我的 PHP 客户端连接:

  $socket = new TSocket('localhost', 9160);
  $transport = new TFramedTransport($socket);
  $protocol = new TBinaryProtocol($transport);
  $client = new ServiceClient($protocol);
  $transport->open();
  $client->listenForEvent();

最后一次调用 ($client->listenForEvent()) 成功将其转移到服务器并运行 ServiceHandler.listenForEvent，但即使该服务器方法返回twisted.internet.defer.Deferred() 实例，客户端立即收到一个空数组，并且出现异常:

exception 'TTransportException' with message 'TSocket: timed out reading 4 bytes from localhost:9160 to local port 38395'

Answer 1

您应该能够从 listenForEvent 返回一个 Deferred。稍后 handleEvent 应该触发返回的 Deferred(或返回的 Deferreds)以实际生成响应。