Mailman 3 May 2008 - Twisted

回复： Re: [Twisted-Python] Re: Memory size of D eferreds
by arlenecc May 21, 2008

May 21, 2008

原信息主题： Re: [Twisted-Python] Re: Memory size of Deferreds 发件人： Tristan Seligmann <mithrandi(a)mithrandi.net> 日期： 2008-05-21 11:38 * Martin Geisler <mg(a)daimi.au.dk> [2008-05-21 13:03:30 +0200]: > In particular, I guess you need to catch the QueueUnderflow exceptions > and then somehow know when it is time to call get() again. DeferredSemaphore may be more appropriate. -- mithrandi, i Ainil en-Balandor, a faer Ambar _______________________________________________ … [View More]

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回复： Re: [Twisted-Python] Re: Memory size of D eferreds
by arlenecc May 21, 2008

May 21, 2008

原信息主题： Re: [Twisted-Python] Re: Memory size of Deferreds 发件人： Tristan Seligmann <mithrandi(a)mithrandi.net> 日期： 2008-05-21 11:38 * Martin Geisler <mg(a)daimi.au.dk> [2008-05-21 13:03:30 +0200]: > In particular, I guess you need to catch the QueueUnderflow exceptions > and then somehow know when it is time to call get() again. DeferredSemaphore may be more appropriate. -- mithrandi, i Ainil en-Balandor, a faer Ambar _______________________________________________ … [View More]

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回复： Re: [Twisted-Python] Re: Memory size of D eferreds
by arlenecc May 21, 2008

May 21, 2008

原信息主题： Re: [Twisted-Python] Re: Memory size of Deferreds 发件人： Tristan Seligmann <mithrandi(a)mithrandi.net> 日期： 2008-05-21 11:38 * Martin Geisler <mg(a)daimi.au.dk> [2008-05-21 13:03:30 +0200]: > In particular, I guess you need to catch the QueueUnderflow exceptions > and then somehow know when it is time to call get() again. DeferredSemaphore may be more appropriate. -- mithrandi, i Ainil en-Balandor, a faer Ambar _______________________________________________ … [View More]

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回复： Re: [Twisted-Python] Re: Memory size of D eferreds
by arlenecc May 21, 2008

May 21, 2008

原信息主题： Re: [Twisted-Python] Re: Memory size of Deferreds 发件人： Tristan Seligmann <mithrandi(a)mithrandi.net> 日期： 2008-05-21 11:38 * Martin Geisler <mg(a)daimi.au.dk> [2008-05-21 13:03:30 +0200]: > In particular, I guess you need to catch the QueueUnderflow exceptions > and then somehow know when it is time to call get() again. DeferredSemaphore may be more appropriate. -- mithrandi, i Ainil en-Balandor, a faer Ambar _______________________________________________ … [View More]

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回复： Re: [Twisted-Python] Re: Memory size of D eferreds
by arlenecc May 21, 2008

May 21, 2008

原信息主题： Re: [Twisted-Python] Re: Memory size of Deferreds 发件人： Tristan Seligmann <mithrandi(a)mithrandi.net> 日期： 2008-05-21 11:38 * Martin Geisler <mg(a)daimi.au.dk> [2008-05-21 13:03:30 +0200]: > In particular, I guess you need to catch the QueueUnderflow exceptions > and then somehow know when it is time to call get() again. DeferredSemaphore may be more appropriate. -- mithrandi, i Ainil en-Balandor, a faer Ambar _______________________________________________ … [View More]

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回复： Re: [Twisted-Python] Re: Memory size of D eferreds
by arlenecc May 21, 2008

May 21, 2008

原信息主题： Re: [Twisted-Python] Re: Memory size of Deferreds 发件人： Tristan Seligmann <mithrandi(a)mithrandi.net> 日期： 2008-05-21 11:38 * Martin Geisler <mg(a)daimi.au.dk> [2008-05-21 13:03:30 +0200]: > In particular, I guess you need to catch the QueueUnderflow exceptions > and then somehow know when it is time to call get() again. DeferredSemaphore may be more appropriate. -- mithrandi, i Ainil en-Balandor, a faer Ambar _______________________________________________ … [View More]

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回复： Re: [Twisted-Python] Re: Memory size of D eferreds
by arlenecc May 21, 2008

May 21, 2008

原信息主题： Re: [Twisted-Python] Re: Memory size of Deferreds 发件人： Tristan Seligmann <mithrandi(a)mithrandi.net> 日期： 2008-05-21 11:38 * Martin Geisler <mg(a)daimi.au.dk> [2008-05-21 13:03:30 +0200]: > In particular, I guess you need to catch the QueueUnderflow exceptions > and then somehow know when it is time to call get() again. DeferredSemaphore may be more appropriate. -- mithrandi, i Ainil en-Balandor, a faer Ambar _______________________________________________ … [View More]

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[Twisted-Python] May Twisted Sprint this weekend
by Christopher Armstrong May 20, 2008

May 20, 2008

What: Twisted Sprint Where: Divmod office, in Porter Square, Cambridge, MA When: 18 May 2008 Who: Anyone who wants to come Hi guys. There's a Twisted sprint at the Divmod office on Sunday, May 18th. At least Glyph, Jean-Paul, Itamar and I will be there; we're hoping Paul Swartz will show up and whoever else wants to come. If you'd like to come please respond and we'll tell you how to get there, etc. -- Christopher Armstrong International Man of Twistery http://radix.twistedmatrix.com/ http:… [View More]

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[Twisted-Python] quitting clients connected to a server from serverside
by Patrick Scharrenberg May 20, 2008

May 20, 2008

Hi! I have a server with multiple clients (processing nodes) which send their data periodically to the server using PB. Now I'm trying to quit the clients from the server-side, eg. when the server is shut down. I tried to install a "quit-callback-routine" from the client on the server, which the server should start if it wants a client to shutdown. But this doesn't work, instead I get a twisted.spread.jelly.InsecureJelly: method error. Please find attached some sample-code I used for … [View More]

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[Twisted-Python] Question: Resuming a failed TCP transfer
by Nadav Aharony May 19, 2008

May 19, 2008

Hi, I'm wondering, is there some built-in Twisted functionality (or any other existing implementation using Twisted) for doing resumable/disruption tolerant file transfer? Sample scenario: A sends file to B, session fails for whatever reason. B saved whatever data was received in some temporary structure, and knows to resume transfer from where it left off or alternatively request specific chunks that it is missing. Wanted to know this before I start implementing such functionality on … [View More]

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[Twisted-Python] Weekly Bug Summary
by exarkun＠twistedmatrix.com May 18, 2008

May 18, 2008

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[Twisted-Python] Adding a file dialog to wxacceptance.py breaks it
by Stephen Waterbury May 17, 2008

May 17, 2008

The attached file is the example wxacceptance.py with a minimal modification to add a file selection dialog. If the file dialog is opened, the counting sequence stops, and although the gui menus still work and the gui is destroyed normally, it appears that the reactor hangs, and it has to be killed. (This example will not work with pre-2.5 versions of wxPython because I removed the compatibility code, which was getting deprecation warnings.) Let me know if I should just put this into a bug … [View More]

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[Twisted-Python] Change in reactor.stop() in Twisted 8.x
by Brian Granger May 16, 2008

May 16, 2008

Hi, We have been using Twisted for a long time and are migrating to 8.0.1. We are finding that code that ran fine with 2.5.0 is giving problems with 8.0.1 and it appears to be related to what is happening in reactor.stop(). The code that is failing looks like this: ########## from twisted.internet import reactor d = doSomeThingThatReturnsADeferred() d.addCallback(handleOK) d.addCallback(lambda _: reactor.stop()) reactor.run() ########## The doSomeThingThatReturnsADeferred method is … [View More]making XMLRPC calls underneath the hood. When we run this, it runs OK, but then blows up at the end with: Traceback (most recent call last): File "/Library/Python/2.5/site-packages/Twisted-8.0.1-py2.5-macosx-10.5-i386.egg/twisted/internet/defer.py", line 185, in addCallbacks self._runCallbacks() File "/Library/Python/2.5/site-packages/Twisted-8.0.1-py2.5-macosx-10.5-i386.egg/twisted/internet/defer.py", line 323, in _runCallbacks self.result = callback(self.result, *args, **kw) File "/Library/Python/2.5/site-packages/Twisted-8.0.1-py2.5-macosx-10.5-i386.egg/twisted/internet/base.py", line 387, in _continueFiring callable(*args, **kwargs) File "/Library/Python/2.5/site-packages/Twisted-8.0.1-py2.5-macosx-10.5-i386.egg/twisted/internet/base.py", line 524, in disconnectAll failure.Failure(main.CONNECTION_LOST)) --- <exception caught here> --- File "/Library/Python/2.5/site-packages/Twisted-8.0.1-py2.5-macosx-10.5-i386.egg/twisted/python/log.py", line 51, in callWithLogger return callWithContext({"system": lp}, func, *args, **kw) File "/Library/Python/2.5/site-packages/Twisted-8.0.1-py2.5-macosx-10.5-i386.egg/twisted/python/log.py", line 36, in callWithContext return context.call({ILogContext: newCtx}, func, *args, **kw) File "/Library/Python/2.5/site-packages/Twisted-8.0.1-py2.5-macosx-10.5-i386.egg/twisted/python/context.py", line 59, in callWithContext return self.currentContext().callWithContext(ctx, func, *args, **kw) File "/Library/Python/2.5/site-packages/Twisted-8.0.1-py2.5-macosx-10.5-i386.egg/twisted/python/context.py", line 37, in callWithContext return func(*args,**kw) File "/Library/Python/2.5/site-packages/Twisted-8.0.1-py2.5-macosx-10.5-i386.egg/twisted/internet/tcp.py", line 577, in connectionLost self.connector.connectionLost(reason) File "/Library/Python/2.5/site-packages/Twisted-8.0.1-py2.5-macosx-10.5-i386.egg/twisted/internet/base.py", line 937, in connectionLost self.factory.clientConnectionLost(self, reason) File "/Library/Python/2.5/site-packages/Twisted-8.0.1-py2.5-macosx-10.5-i386.egg/twisted/web/xmlrpc.py", line 325, in clientConnectionLost self.deferred.errback(reason) File "/Library/Python/2.5/site-packages/Twisted-8.0.1-py2.5-macosx-10.5-i386.egg/twisted/internet/defer.py", line 264, in errback self._startRunCallbacks(fail) File "/Library/Python/2.5/site-packages/Twisted-8.0.1-py2.5-macosx-10.5-i386.egg/twisted/internet/defer.py", line 293, in _startRunCallbacks raise AlreadyCalledError twisted.internet.defer.AlreadyCalledError: I have checked and there is no failure object in my callback chain - this is internal to Twisted. Has the logic in reactor.stop changed recently? Any ideas about what would be causing this? Thanks Brian [View Less]

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[Twisted-Python] [RFC] Deprecation Policy
by Jonathan Lange May 15, 2008

May 15, 2008

Hello everyone, Now that the release is out[1], I'd like to start work on fixing #1216 -- official deprecation policy. There's one proposed policy at http://twistedmatrix.com/trac/wiki/CompatibilityPolicy, there's also one mentioned in the ticket itself: deprecate in release N, remove in release N+1. Glyph has at one point expressed a desire for time-based deprecation.[2] I think these are all the questions we need to answer: - Is it time-based or release-based? - How long for? - Do we grade … [View More]deprecations? How? - Which code is subject to this policy? CompatibilityPolicy suggests release-based deprecation that is graded over 4 releases: release N PendingDeprecationWarning, N+1 DeprecationWarning, N+2 DeprecationError, N+3 remove the functionality. Ticket #1216 suggests a release-based deprecation policy that is not graded and over 1 release: release N, add DeprecationWarning, release N+1, remove the functionality. Important factors to bear in mind: - Maintaining deprecated APIs brings a cost to developers when they maintain code. - Removing APIs brings a cost to users when they choose to upgrade. - We will probably always be changing APIs and making mistakes when we change them. Now, here's what I think. * Release-based, not time-based. Releases are easy to track, dates are less so. This is as true for Twisted programmers as it is for sysadmins & other Twisted users. I think that whatever problems are solved by time-based deprecation are better solved by regular releases. Our releases should, of course, be time-based. But that's another discussion. * Two release deprecation length. That is: release N, DeprecationWarning; release N+1, DeprecationWarning; release N+2, remove the functionality. This is enough to allow users to upgrade their version of Twisted incrementally. Trial has been doing one release for quite a while now, and I can't recall any complaints about breaking compatibility in released code. Micro-releases don't count. * No grading I think the DeprecationWarning vs PendingDeprecationWarning vs DeprecationError is too much hassle. Just say "next release" or "in two releases time". * All "public" code and command-line tools should be covered. Things marked as deprecated at the time of the 8.0 release should be grandfathered so as to be safe for removal. Anything else will get too confusing. The removal of the API stability markers agrees with this. Everything is public unless it starts with one underscore.[3] Most importantly, we should have a policy, we should all agree and as much of the policy as possible should be implemented in Python. This bug has been open for years now, and it is frustrating for the policy to change under one's feet or to disagree with other developers on something so fundamental. "Explicit is better than implicit". I'm sending this now because the 8.0 release is settling down and we have a sprint coming up where it might be easier to resolve this quickly. jml [1] I'm so happy. [2] http://twistedmatrix.com/trac/ticket/2352 [3] This hurts. t.trial.util doesn't begin with an underscore. [View Less]

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[Twisted-Python] Python logging with Twisted
by IloChab May 15, 2008

May 15, 2008

I like Python logging module and I didn't feel comfortable with twisted log. So I was really happy to find the new PythonLoggingObserver in twisted last release. I wrote few modules that came in handy: 1) a NetworkHandler that uses a twisted connection to work with PythonLoggingObserver 2) a log server that offers a centralized log storage service to distributed twisted processes that connect to it via that NetworkHandler 3) a GUI to manage log files browsing and interactive dynamic … [View More]

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[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 … [View More]

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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 … [View More]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) [View Less]

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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-… [View More]

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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 … [View More]

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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 … [View More]

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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 … [View More]

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