Mailman 3 May 2008 - Twisted

[Twisted-Python] how to handle game messaging
by Jake b May 15, 2008

May 15, 2008

Hello, I'm new to the list. I've been going through the twisted tutorials, and now I'm trying to write a simple asteroids clone to better understand twisted. ( Think asteroids: but 2 players on a LAN ) (1) In a game like this, or even a first person shooter: where message speed is more important: What is a good way to send messages to/from the client and server? Important ones like bullet spawning, other player locations, etc ? (2) Do you also send a timestamp so that if the client receives the message 250ms after the spawn, he can step backwards in his physics simulation to better simulate client-side? (3) I wrote pseudo-code of how I think the asteroids code messaging could work. How do I improve messaging? What am I doing wrong? For my example I'm going to only use LAN ( so I don't have to deal with latency issues ). I attached the pseudo code. Here's an overview of the code: A GameClient() (run once per client) and GameServer() (run once). There is a list of Bullet()s and a list of Asteroid()s. When a player fires, he will tell/ask the server. The server will pass all spawnings onto the clients. I don't think I need to constantly update the clients with physics updates -- except the locations of the players. All other updates should be able to be handled on events ( asteroid shot, player collisions, etc... ) thanks, -- Jake

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[Twisted-Python] I'm stuck
by Curt May 13, 2008

May 13, 2008

Ok, first, I'm a true newbie, I've been playing with twisted, and python for that matter, for about 3 days. I've been trying to get this script to work, and I *know* I've got to be doing something simple wrong. All it is, is a slap-together of various examples available in the twisted documentation to see if I can learn how this works. Here's the script All it is supposed to do at this point is accept a normal telnet connection on one port and authenticate it, and an ssh on another, and authenticate, I'm attempting to write an interpreter to connect both inputs to, but right now I'm stuck getting the connections to hold. Any assistance would be most welcome. from zope.interface import implements from twisted.internet import protocol from twisted.application import service, strports from twisted.conch.ssh import session from twisted.conch import interfaces as iconch from twisted.cred import portal, checkers from twisted.python import usage from twisted.conch.insults import insults from twisted.conch import recvline, manhole_ssh, telnet class parseInput(recvline.HistoricRecvLine): def connectionMade(self): print("Got Connection to parseInput") recvline.HistoricRecvLine.connectionMade(self) print("Came back from the undercall") self.interpreter=commandInterpreter def handle_QUIT(self): self.terminal.loseConnection() def lineReceived(self, line): print("Input, " + line) self.terminal.write("I got, " + line) class makeTelnetProtocol: def __init__(self, portal): self.portal = portal def __call__(self): auth = telnet.AuthenticatingTelnetProtocol args = (self.portal,) return telnet.TelnetTransport(auth, *args) class chainedProtocolFactory: def __init__(self, namespace): self.namespace = namespace def __call__(self): return insults.ServerProtocol(parseInput, self.namespace) class _BaseTelnetRealm: implements(portal.IRealm) def __init__(self, proto, *a, **kw): self.protocolFactory = proto self.protocolArgs = a self.protocolKwArgs = kw def requestAvatar(self, avatarId, *interfaces): if telnet.ITelnetProtocol in interfaces: return (telnet.ITelnetProtocol, self.protocolFactory(*self.protocolArgs, **self.protocolKwArgs), lambda: None) raise NotImplementedError() class Options(usage.Options): optParameters = [ ["telnetPort", "t", None, "strports description of the address on which to listen for telnet connections"], ["sshPort", "s", None, "strports description of the address on which to listen for ssh connections"]] def __init__(self): usage.Options.__init__(self) self.users = [] self['namespace'] = None def opt_user(self, name): self.users.append(name) def postOptions(self): if self['telnetPort'] is None and self['sshPort'] is None: raise usage.UsageError("At least one of --telnetPort and --sshPort must be specified") def makeService(options): """Create a server service. @type options: C{dict} @param options: A mapping describing the configuration of the desired service. Recognized key/value pairs are:: "telnetPort": strports description of the address on which to listen for telnet connections. If None, no telnet service will be started. "sshPort": strports description of the address on which to listen for ssh connections. If None, no ssh service will be started. "namespace": dictionary containing desired initial locals for manhole connections. If None, an empty dictionary will be used. @rtype: L{twisted.application.service.IService} @return: A server service. """ svc = service.MultiService() namespace = options['namespace'] if namespace is None: namespace = {} checker = checkers.InMemoryUsernamePasswordDatabaseDontUse() checker.addUser("guest", "testing") if options['telnetPort']: telnetRealm = _BaseTelnetRealm(telnet.TelnetBootstrapProtocol, insults.ServerProtocol, parseInput, namespace) telnetPortal = portal.Portal(telnetRealm, [checker]) telnetFactory = protocol.ServerFactory() telnetFactory.protocol = makeTelnetProtocol(telnetPortal) telnetService = strports.service(options['telnetPort'], telnetFactory) telnetService.setServiceParent(svc) if options['sshPort']: sshRealm = manhole_ssh.TerminalRealm() sshRealm.chainedProtocolFactory = chainedProtocolFactory(namespace) sshPortal = portal.Portal(sshRealm, [checker]) sshFactory = manhole_ssh.ConchFactory(sshPortal) sshService = strports.service(options['sshPort'], sshFactory) sshService.setServiceParent(svc) return svc application = service.Application("Learn Twisted") makeService({"telnetPort": "tcp:9900", "sshPort": "tcp:9901", "namespace": {"foo": "bar"}}).setServiceParent(application)

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[Twisted-Python] Patches for ldaptor setup, so that bdist_rpm will work
by Gregg Lind May 13, 2008

May 13, 2008

These patches make it so that: $ python setup.py bdist_rpm will work in the usual way, making it simple for people to distribute python-ldaptor Thanks! Gregg babbledog.com #### MANIFEST.in include MANIFEST.in include TODO recursive-include debian * recursive-include po * recursive-include ldaptor/apps * #### SETUP.PY [gregg@irc01 ldaptor]$ diff -c ldaptor-snapshot*/setup.py | less *** ldaptor-snapshot2/setup.py 2008-05-13 14:15:03.000000000 +0100 --- ldaptor-snapshot/setup.py 2007-06-18 23:12:23.000000000 +0100 *************** *** 118,135 **** def run(self): if not self.skip_build: self.run_command('build_locale') ! self.outfiles = copy_tree(src=self.build_dir, dst=self.install_dir, dry_run=self.dry_run) - - def get_outputs (self): - ''' - ## there needs to be a get_outputs method for build_rpm - ## as part of distutils/install.py - ## this should return a list of files to be installed. -- GRL - ''' - return self.outfiles - if __name__=='__main__': setup(name="ldaptor", --- 118,126 ---- def run(self): if not self.skip_build: self.run_command('build_locale') ! copy_tree(src=self.build_dir, dst=self.install_dir, dry_run=self.dry_run) if __name__=='__main__': setup(name="ldaptor",

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[Twisted-Python] Source for Python-ldaptor 0.0.44?
by Gregg Lind May 12, 2008

May 12, 2008

Hello! Does any know working svn addresses for ldaptor? So far, my best luck has been use (in debian) $apt-get source python-ldaptor Is there a more conventional way of getting it? Thanks, Gregg

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[Twisted-Python] Re: Twisted Presentation Materials... Re:
by Andrew Francis May 12, 2008

May 12, 2008

Hi Yi: > I think you're right that giving an broad overview > of the concepts > behind twisted is a good idea. > > Can give a link to your slides when you think it's > ready? I would love > to read them. Well you can get the slides at https://exchange.mcgill.ca/exchweb/bin/redir.asp?URL=http://us.pycon.org/co… The main problem is redoing the illustrations so I don't know when I will have an update..... At this stage I don't think folks care. That said, I am working on a new presentation, slightly longer in length, more Stackless and Twisted examples, less talk about WS-BPEL. Cheers, Andrew ____________________________________________________________________________________ Be a better friend, newshound, and know-it-all with Yahoo! Mobile. Try it now. http://mobile.yahoo.com/;_ylt=Ahu06i62sR8HDtDypao8Wcj9tAcJ

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The Eckel Twisted Blog Post Re: [Twisted-Python] Twisted Presentation
by Andrew Francis May 12, 2008

May 12, 2008

Hi Yi: > I think that actually most people there will > probably not be so much interested in the theory >behind twisted as opposed to what > twisted can do for them...now. Mathematicans can be > very practical you know ;-) Well if that is the case, I recommend you look at the latest Bruce Eckel blog post where he uses PyAMF and Twisted to do distributed computations. Tres cool. http://www.artima.com/weblogs/viewpost.jsp?thread=230001 Cheers, Andrew ____________________________________________________________________________________ Be a better friend, newshound, and know-it-all with Yahoo! Mobile. Try it now. http://mobile.yahoo.com/;_ylt=Ahu06i62sR8HDtDypao8Wcj9tAcJ

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Re: [Twisted-Python] SQLAlchemy and Twisted
by Terry Jones May 12, 2008

May 12, 2008

Hi Alex. > Anyone: If anyone know of existing code that integrates Twisted and > SQLAlchemy nicely, please share! http://developer.berlios.de/projects/nadbapi/ Terry

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[Twisted-Python] Weekly Bug Summary
by exarkun＠twistedmatrix.com May 11, 2008

May 11, 2008

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Re: [Twisted-Python] Oddity(?) with zero-length Deferred lists
by Terry Jones May 9, 2008

May 9, 2008

Hi Greg > Thank you for the quick and informative answer! You might also read this brief thread if you don't fully follow the answer. It's exactly the same issue, as I ran into it last month. http://twistedmatrix.com/pipermail/twisted-python/2008-April/017590.html Terry

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[Twisted-Python] Oddity(?) with zero-length Deferred lists
by Gregg Lind May 9, 2008

May 9, 2008

Good afternoon! I notice an oddity with zero-length DeferredLists. The example script (http://dpaste.com/49099/) should just return the contents of a bunch of URLs given at the command line, or some errors like so: $ python test.py a b c [(False, <twisted.python.failure.Failure twisted.web.error.Error>), (False, <twisted.python.failure.Failure twisted.web.error.Error>), (False, <twisted.python.failure.Failure twisted.web.error.Error>)] *but* $ python test.py # no arguments [] # then hangs, never reaching "quit" Is this odd behaviour? In defer.py 's DeferredList.__init__ there is: self.resultList = [None] * len(deferredList) Deferred.__init__(self) if len(deferredList) == 0 and not fireOnOneCallback: self.callback(self.resultList) Thanks in advance! Gregg ------------------------ #!/usr/bin/env python ## example script1 from twisted.web.client import getPage from twisted.internet import reactor, defer def getUrls(L): dL = defer.DeferredList( [getPage(x) for x in L] , consumeErrors=True) return dL def results(data): print data return def quit(data): reactor.stop() return if __name__ == "__main__": import sys L = sys.argv[1:] d = getUrls(L) d.addCallback(results) d.addCallback(quit ) reactor.run()

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