[Twisted-Python] Newbie Problem
This is probably something simple. I'm having some trouble with this little bit of code below. I start it up once as a server, then a second time as the client connecting to localhost. However, it never actually seems to connect. Both sides just wait indefinitely. I'm a bit stuck as to how to debug this, so if someone has a solution for me and could tell me how I would have figured it out, that would be great!
Thanks, Damon
import sys import optparse
import zope.interface
from twisted.spread import pb from twisted.internet import reactor from twisted.internet import interfaces from twisted.python import util
class ConsoleInput(object): zope.interface.implements(interfaces.IReadDescriptor)
def fileno(self): return 0
def connectionLost(self, reason): print "Lost connection because %s" % reason
def doRead(self): d = self.root.callRemote("echo", sys.stdin.readline().strip())
def setRoot(self, root): print "got root" self.myEchoer = Echoer() self.root = root self.root.callRemote('GiveReference', self.myEchoer)
def logPrefix(self): return 'ConsoleInput'
class Echoer(pb.Root): def remote_echo(self, st): print 'echoing:', st return st
def remote_GiveReference(self, ref): self.client_ref = ref
def main(): parser = optparse.OptionParser() parser.add_option('--host', dest='host', help='Host to connect to.') options, args = parser.parse_args()
ci = ConsoleInput() reactor.addReader(ci)
if options.host: host = options.host factory = pb.PBClientFactory() print "Connecting to %s..." % host reactor.connectTCP(host, 8789, pb.PBClientFactory()) d = factory.getRootObject() d.addCallback(ci.setRoot) d.addErrback(lambda reason: "error %s" % reason.value) d.addCallback(util.println) else: print "Listening..." root = Echoer() factory = pb.PBServerFactory(root) reactor.listenTCP(8789, factory)
reactor.run()
if __name__ == '__main__': main()
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On Tue, 12 Sep 2006 21:11:30 -0700 (PDT), Damon Kohler damonkohler@yahoo.com wrote:
This is probably something simple. I'm having some trouble with this little bit of code below. I start it up once as a server, then a second time as the client connecting to localhost. However, it never actually seems to connect. Both sides just wait indefinitely. I'm a bit stuck as to how to debug this, so if someone has a solution for me and could tell me how I would have figured it out, that would be great!
Most likely the problem is sys.stdin.readline(). I suggest taking a look at twisted.internet.stdio as a way to eliminate your ConsoleInput class and the uses of the reactor-private method addReader().
If I were going to try to track down the cause of the hang, I'd probably start with strace to see where the processes are waiting.
Jean-Paul
Thanks for the help. Unfortuantely, I'm still stuck. I'm on OS X and so I'm using ktrace. So far, it hasn't given me much insight. Also, it doesn't appear to be the sys.stdin call causing the trouble since I can replace that with just a string and get the same results. Any other ideas?
Damon
--- Jean-Paul Calderone exarkun@divmod.com wrote:
On Tue, 12 Sep 2006 21:11:30 -0700 (PDT), Damon Kohler damonkohler@yahoo.com wrote:
This is probably something simple. I'm having some trouble with this little
bit
of code below. I start it up once as a server, then a second time as the
client
connecting to localhost. However, it never actually seems to connect. Both sides just wait indefinitely. I'm a bit stuck as to how to debug this, so if someone has a solution for me and could tell me how I would have figured it out, that would be great!
Most likely the problem is sys.stdin.readline(). I suggest taking a look at twisted.internet.stdio as a way to eliminate your ConsoleInput class and the uses of the reactor-private method addReader().
If I were going to try to track down the cause of the hang, I'd probably start with strace to see where the processes are waiting.
Jean-Paul
Twisted-Python mailing list Twisted-Python@twistedmatrix.com http://twistedmatrix.com/cgi-bin/mailman/listinfo/twisted-python
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Whoops. Found the problem. Wasn't using the client factory I created and instead used a new factory in the reactor call :(
--- Damon Kohler damonkohler@yahoo.com wrote:
Thanks for the help. Unfortuantely, I'm still stuck. I'm on OS X and so I'm using ktrace. So far, it hasn't given me much insight. Also, it doesn't appear to be the sys.stdin call causing the trouble since I can replace that with just a string and get the same results. Any other ideas?
Damon
--- Jean-Paul Calderone exarkun@divmod.com wrote:
On Tue, 12 Sep 2006 21:11:30 -0700 (PDT), Damon Kohler damonkohler@yahoo.com wrote:
This is probably something simple. I'm having some trouble with this
little
bit
of code below. I start it up once as a server, then a second time as the
client
connecting to localhost. However, it never actually seems to connect. Both sides just wait indefinitely. I'm a bit stuck as to how to debug this, so
if
someone has a solution for me and could tell me how I would have figured
it
out, that would be great!
Most likely the problem is sys.stdin.readline(). I suggest taking a look at twisted.internet.stdio as a way to eliminate your ConsoleInput class and the uses of the reactor-private method addReader().
If I were going to try to track down the cause of the hang, I'd probably start with strace to see where the processes are waiting.
Jean-Paul
Twisted-Python mailing list Twisted-Python@twistedmatrix.com http://twistedmatrix.com/cgi-bin/mailman/listinfo/twisted-python
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Twisted-Python mailing list Twisted-Python@twistedmatrix.com http://twistedmatrix.com/cgi-bin/mailman/listinfo/twisted-python
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participants (2)
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Damon Kohler -
Jean-Paul Calderone