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POHow to properly trigger a python twisted transport?
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  1. POHow to properly trigger a python twisted transport?
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    copied!<p>I have been asked to write a class that connects to a server, asynchronously sends the server various commands, and then provides the returned data to the client. I've been asked to do this in Python, which is a new language to me. I started digging around and found the Twisted framework which offers some very nice abstractions (Protocol, ProtocolFactory, Reactor) that do a lot of the things that I would have to do if I would roll my own socket-based app. It seems like the right choice given the problem that I have to solve. </p> <p>I've looked through numerous examples on the web (mostly <a href="http://krondo.com/?page_id=1327" rel="nofollow" title="krondo">Krondo</a>), but I still haven't seen a good example of creating a client that will send multiple commands across the wire and I maintain the connection I create. The server (of which I have no control over), in this case, doesn't disconnect after it sends the response. So, what's the proper way to design the client so that I can tickle the server in various ways? </p> <p>Right now I do this: </p> <pre><code>class TestProtocol(Protocol) def connectionMade(self): self.transport.write(self.factory.message) class TestProtocolFactory(Factory): message = '' def setMessage(self, msg): self.message = msg def main(): f = TestProtocolFactory() f.setMessage("my message") reactor.connectTCP(...) reactor.run() </code></pre> <p>What I really want to do is call <code>self.transport.write(...)</code> via the reactor (really, call TestProtocolFactory::setMessage() on-demand from another thread of execution), not just when the connection is made. </p>
 

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