Mailman 3 January 2005 - Twisted

[Twisted-Python] tac and tap in the same file
by Andrea Arcangeli 30 Jan '05

30 Jan '05

While I appreciate the tweaking of the tap file for production usage, during development it's more handy to use a tac file and avoid the pickling that otherwise would happen too frequently for every test. By adding these lines at the end of the tap.py file I can run both tac and tap from the same file by using tap.py instead like if it was a tac file (started with twistd -noy) It wasn't obvious immediatly that it was possible. I only had to add these lines at the end of tap.py (tap.py like in finger example of the howto): s = web.make_service(Options()) from twisted.application import service application = service.Application('cpushare_web') s.setServiceParent(service.IServiceCollection(application)) This takes all option defaults just fine (like if mktap was run without tweaking parameters). I believe a cut and paste shoud work for most tap files if they follow the same naming of the Options class. I didn't see this trick mentioned in the docs, so JFYI.

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[Twisted-Python] Is delivered mail
by Stephen 30 Jan '05

30 Jan '05

1 0

[Twisted-Python] Delivery by mail
by Stephen 30 Jan '05

30 Jan '05

1 0

[Twisted-Python] How to develop a module to download a file from a path
by Mosas 29 Jan '05

29 Jan '05

Dear All, I want know how to develop a module to download a file from a path using twisted.web.static.File Class . I think using this class we can create easily Actually I am new to twisted concepts. So If anybody know regarding this mail me. regards prabahar ________________________________________________________________________ Yahoo! India Matrimony: Find your life partner online Go to: http://yahoo.shaadi.com/india-matrimony

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[Twisted-Python] Starting MoinMoin as nonroot Linux User
by Garrett Rolfs 28 Jan '05

28 Jan '05

I fear I'm missing something basic and overlooked something already documented. Hopefully someone will set me straight. I'm attempting to play with MoinMoin using twisted as the webserver. I'm running on linux using python 2.3.4 and twisted 1.3.0 as a nonroot user. When I attempt to start MoinMoin, I see the following in the log: 2004/12/20 17:05 CST [-] Starting factory <MoinMoin.server.twistedmoin.MoinSite instance at 0x40a070ec> 2004/12/20 17:05 CST [-] Traceback (most recent call last): 2004/12/20 17:05 CST [-] File "/home/stage3/bin/twistd", line 36, in ? 2004/12/20 17:05 CST [-] run() 2004/12/20 17:05 CST [-] File "/home/stage3/lib/python2.3/site-packages/twisted/scripts/twistd.py", line 184, in run 2004/12/20 17:05 CST [-] app.run(runApp, ServerOptions) 2004/12/2017:05 CST [-] File "/home/stage3/lib/python2.3/site-packages/twisted/application/app.py", line 205, in run 2004/12/20 17:05 CST [-] runApp(config) 2004/12/20 17:05 CST [-] File "/home/stage3/lib/python2.3/site-packages/twisted/scripts/twistd.py", line 175, in runApp 2004/12/20 17:05 CST [-] startApplication(config, application) 2004/12/20 17:05 CST [-] File "/home/stage3/lib/python2.3/site-packages/twisted/scripts/twistd.py", line 160, in startApplication 2004/12/20 17:05 CST [-] shedPrivileges(config['euid'], process.uid, process.gid) 2004/12/20 17:05 CST [-] File "/home/stage3/lib/python2.3/site-packages/twisted/scripts/twistd.py", line 134, in shedPrivileges 2004/12/20 17:05 CST [-] switchUID(uid, gid, euid) 2004/12/20 17:05 CST [-] File "/home/stage3/lib/python2.3/site-packages/twisted/python/util.py", line 606, in switchUID 2004/12/20 17:05 CST [-] initgroups(uid, gid) 2004/12/20 17:05 CST [-] File "/home/stage3/lib/python2.3/site-packages/twisted/python/util.py", line 584, in initgroups 2004/12/20 17:05 CST [-] setgroups(l) 2004/12/20 17:05 CST [-] OSError: [Errno 1] Operation not permitted I am merely experimenting and I would like to run without being root. Is it possible? Thanks, -Garrett Rolfs

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[Twisted-Python] Delivery service mail
by Stephen 28 Jan '05

28 Jan '05

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[Twisted-Python] Re: dramatic slowdown in pbbenchclient.py
by russ 28 Jan '05

28 Jan '05

>>The slowdown only appears between two different computers. If I run >>it on a single computer I get 700 cps. If I run it between two >>separate computers but with one or two simultaneous deferreds, then >>there's only a very minor slowdown. I'm running on windows 2000 with >>Twisted-1.3.0.win32-py2.3.exe. >>What do you think? Is this a strange behaviour of twisted or is there >>something screwed up with my networking? >> >> > >It is possible this is due to the immediate-write behavior of twisted >1.3 combined with the TCP Nagle algorithm. You could try calling >transport.setTcpNoDelay(True) on both ends (the client and the server >end) to see if that helps. > >James > > Ok, now I'm feeling quite clueless. I guessed that "transport" refers to myPBClientFactory.protocol.transport (for the client case). But this is set to None and never changes. Where is the underlying transport stored in PBClientFactory and PBServerFactory? Thanks, -Russ

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[Twisted-Python] Problem with ClientFactory
by Michal Chruszcz 27 Jan '05

27 Jan '05

Hi, I've been writing a small client program connecting to the server through SSL when occurred a strange problem. At the beginning I thought that it was my fault, I changed my mind after examining examples (exactly echoclient_ssl.py) shipped with the Twisted distribution, though. After many try-and-fails I think I found the problematic code. I created this test case to show the issue: #v+ from OpenSSL import SSL from twisted.internet.protocol import ClientFactory from twisted.protocols.basic import LineOnlyReceiver class Protocol(LineOnlyReceiver): def connectionMade(self): self.sendLine("GET / HTTP/1.0\n") def lineReceived(self, line): print line class Factory(ClientFactory): protocol = Protocol def startedConnecting(self, connector): print "Connecting..." def buildProtocol(self, addr): print "Connected." def clientConnectionLost(self, connector, reason): print "Connection Lost." reactor.stop() def clientConnectionFailed(self, connector, reason): print "Connection Failed." reactor.stop() if __name__ == "__main__": host = "sf.net" port = 443 from twisted.internet import reactor, ssl reactor.connectSSL(host, port, Factory(), ssl.ClientContextFactory()) reactor.run() #v- After running this code I get "Connecting, Connected" lines and long tracebacks warning about two exceptions (I could attach it, if it was useful). $ rpm -q python-Twisted python-pyOpenSSL; uname -o python-Twisted-1.3.0-7 python-pyOpenSSL-0.6-2 PLD Linux The most interesting (funny?) thing with this problem is the simplest workaround - after removing startedConnecting and buildProtocol methods of Factory class everything works fine, I get the response from the server and requested page. Is that meant to (not)work that way? If so, please write it somewhere in the HOWTO using big letters, otherwise let somebody fix it. ;-) P.S. HTTPS is just an example. I know about dedicated software for that purpose, but it's useless for me. ;-) I'm just wondering about the cause of this problem. -- Michal Chruszcz -=- Seen at http://1lo.sanok.pl/~troll/gallery.php

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[Twisted-Python] dramatic slowdown in pbbenchclient.py / pbbenchserver.py
by russ 26 Jan '05

26 Jan '05

Hello, there's a dramatic slowdown in the number of calls per second in the pbbenchclient.py / pbbenchserver.py programs (http://twistedmatrix.com/documents/current/examples/) if I just change the number of deferred calls from two to three, and make the connection between two different computers. With the stock program, I get around 900 cps, with the modified one, I get around 5 cps. I'm a newbie, so maybe something is going on that I'm not understanding. Anyway, here are the pseudo-diffs in pbbenchclient.py: << hostname = 'localhost' >> hostname = '192.168.0.2' and << d1 = self.persp.callRemote("simple") << d2 = self.persp.callRemote("complexTypes") << defer.DeferredList(l).addCallback(self.callLoop) >> l=[self.persp.callRemote("simple") for x in range(3)] >> defer.DeferredList(l).addCallback(self.callLoop) The slowdown only appears between two different computers. If I run it on a single computer I get 700 cps. If I run it between two separate computers but with one or two simultaneous deferreds, then there's only a very minor slowdown. I'm running on windows 2000 with Twisted-1.3.0.win32-py2.3.exe. What do you think? Is this a strange behaviour of twisted or is there something screwed up with my networking? Cheers, -Russ

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[Twisted-Python] Error in example source
by Steve Freitas 26 Jan '05

26 Jan '05

Hi, In this source (part of the tutorial at http://twistedmatrix.com/documents/current/howto/pb-copyable): http://twistedmatrix.com/documents/current/howto/listings/pb/copy_receiver.… When you run it, it does nothing and exits. Could somebody let me know what needs to be added to actually fire the service up? Thanks, Steve

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