SocketServer class examples

Daniel Eloff danieleloff at hotmail.com
Mon Jul 19 00:32:29 CEST 2004


Just a suggestion, but if you're doing any networking code, I would use
Twisted ( http://www.twistedmatrix.com ). It's fast and remarkably easy
to use. I don't think there is anything quite as good in any language
that I've used. If you don't have a big investment in code you might
consider it, or keep it in mind for future work.

Implementing an echo server with Twisted is a mere half dozen lines of
code.

I created an entire proxy server (that works for any line based
protocol) in a mere 30 lines of code (counting whitespace). And I'm a
Python newbie :)

-----Original Message-----
From: python-list-bounces+danieleloff=hotmail.com at python.org
[mailto:python-list-bounces+danieleloff=hotmail.com at python.org] On
Behalf Of Frederick Grim
Sent: Sunday, July 18, 2004 11:34 AM
To: python-list at python.org
Subject: SocketServer class examples 

Howdy group,
    So I am in the middle of using the socketserver class from the std
library and have run into a problem that probably reveals my
misunderstanding of sockets.  I have a class defined like so:

class tcp_listener(SocketServer.ThreadingTCPServer):
        def __init__(self, addr, port):
                SocketServer.ThreadingTCPServer.__init__(self, \
                    (addr, port), Daemon.request_handler)

""" Yes I realize the above is silly and redundant """

And a request handler in Daemon that has a handle function that works
like
so:
    def __req_handle(self, req):
        """ Do stuff with req and return a response afterwards """
        return response

    def handle(self);
        while True:
            input = self.rfile.readline()
            request = input
            while input and not re.search('EOF$', input):
                input = self.rfile.readline()
                request += input

            self.wfile.write(self.__req_handle(request))

The client end looks almost identical to the example in the python docs.
So
the problem here is that this code doesn't work.  Using tcpdump I can
tell
that the client is sending to the server properly but the server is
never
responding.  Or when it tries to respond it gets stuck in the write.
What's
going on here.  I can't seem to find a single example of how to use this
class on the client and server side and I don't want to use twisted
(because
I should understand how this works instead of relying on canned
software).
Does anyone know where I can find an example of a functioning
SocketServer
and client? Google seems to help nought here.
    Thanks,
    Fred

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