Mailman 3 November 2008 - Twisted

Re: [Twisted-Python] A kinder and more consistent defer.inlineCallbacks
by Terry Jones 28 Nov '08

28 Nov '08

Hi JP > Not quite: > > >>> def f(): > ... yield None > ... > >>> f(1, 2, 3) > Traceback (most recent call last): > File "<stdin>", line 1, in <module> > TypeError: f() takes no arguments (3 given) > >>> Ah... thanks. > And unfortunately, there is essentially no way to differentiate this case > from a case where the call to `f´ succeeded but some code executed as a > result of that raised a `TypeError´. Right, not without looking at the text of the exception, which, apart from being extremely would be unreliable. Too bad there's not a Python exception for incorrect function/method arg passing. > See also <http://twistedmatrix.com/trac/ticket/2501>. Ha! There's pretty much the whole of this thread in there. I'll look more carefully in trac next time. I did look at some point, and saw another issue discussing what to do if a non-deferred is yielded. Thanks again. Terry

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[Twisted-Python] Please test Twisted 8.2.0pre2 and tell me whether it works
by Christopher Armstrong 28 Nov '08

28 Nov '08

I just uploaded 8.2.0pre2 tarballs, which include one bugfix since 8.2.0pre1 which was deemed important enough to be backported: - TLS Session Tickets are now disabled by default, allowing connections to certain servers which hang when an empty session ticket is received (like GTalk) (#3463) The tarballs are at http://twistedmatrix.com/users/radix/8.2.0pre2/ If you want to test 8.2.0pre2 on Windows, Thomas Hervé may be able to build installers some time tomorrow. Please test it out - I haven't heard any results from the pre1 release yet. If you don't test it then 8.2.0 will be horrible, and it will be your fault. You know, I've heard some people are using Twisted to manage puppy incubators. Think of the puppies. http://www.ustream.tv/channel/shiba-inu-puppy-cam -- Christopher Armstrong http://radix.twistedmatrix.com/ http://planet-if.com/ http://canonical.com/

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[Twisted-Python] Twisted on Windows: "Python does not appear to be installed"
by Patrice RENAUD 26 Nov '08

26 Nov '08

Hi all, Twisted does not install on my windows XP /python 2.6 computer. Twisted installer says: "Python does not appear to be installed" but python is really installed and runs well on my computer ! What is the solution ? thanks Patrice -- Patrice RENAUD Observatoire de Paris - Station de Radioastronomie de Nancay Tel: 02 48 51 87 21 Fax: 02 48 51 83 18 Email: Patrice.Renaud(a)obs-nancay.fr

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[Twisted-Python] Running a GUI application based on PyQt
by Nahuel Defossé 26 Nov '08

26 Nov '08

Hi, I'm trying to use a simple application based in twisted.internet.Protocol with PyQt4. PyQt has its own way of dealing with events, I've tried to run the reactor in a thread, but it says it only can acquire SIGINT from the main thread :( I've tried the code posted in qt4reactor.py but it doesn't work. It fails telling that a reactor's been already installed. Is it possible to use PyQt4 (v.4.4) with twisted? Thanks Nahuel

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[Twisted-Python] SSL Client Certificates?
by asset 25 Nov '08

25 Nov '08

Would I be right in assuming that the example echoserv_ssl.py and echoclient_ssl.py will only result in encryption from the client to server and not from the server back to the client? Im referencing these examples specifically, http://twistedmatrix.com/projects/core/documentation/examples/echoclient_ss… http://twistedmatrix.com/projects/core/documentation/examples/echoclient_ss… From what I know of SSL, the client connects to the server, and after the handshake it uses the cert to encrypt its communication to the server and the server uses the private key to decrypt it; but the server's traffic back to the client will not be encrypted without having to use a client certificate. So my question is how wrong am I on this? And if needed, how do I setup a client certificate to succeed in two way encryption? Thanks! TKiel

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[Twisted-Python] sending file but LineReceiver doesnt run
by Aydın ŞEN 25 Nov '08

25 Nov '08

Hi, I am trying to send file which is in the client's disk, i am using LineReceiver in the server side. I am sending and receiving data like login stuff but when i start to read & send file LineReceiver method doesnt run in the server side. Sending file code part is below, what can be cause of this? * i am reading 100 kb parts of file and send it, is it best choice? or reading file once and send it better? KB = 1024 * 100 while True: if (KB > file_size) | (KB == file_size): data = self.file.read(file_size) self.send_data(data) self.sended += file_size self.file.close() break else: data = self.file.read(KB) file_size -= KB self.send_data(data) self.sended += KB def send_data(self, data): self.transport.write(data + '\r\n') -- Aydın ŞEN Ege Üniversitesi Uluslararası Bilgisayar Enstitüsü

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[Twisted-Python] Blocking reactor.connectSSL()
by asset 25 Nov '08

25 Nov '08

Is there a workaround for reactor.connectSSL() blocking during the SSL handshake? I dug around and found some indications that it could be a problem fixed in Python 2.6 and 3.0, but also that its something that is worked around in Twisted, but I havent been able to find any reference to the issue with Twisted specifically. TKiel

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Re: [Twisted-Python] A kinder and more consistent defer.inlineCallbacks
by Terry Jones 24 Nov '08

24 Nov '08

>>>>> "glyph" == glyph <glyph(a)divmod.com> writes: glyph> On 22 Nov, 05:50 pm, terry(a)jon.es wrote: >> def altInlineCallbacks(f): >> def unwindGenerator(*args, **kwargs): >> try: >> result = f(*args, **kwargs) >> except Exception, e: >> # f was not a generator. >> return failure.Failure() glyph> I hope you mean "defer.fail()". Yes, sorry. glyph> As with the other case we mistakenly diagnosed here, it doesn't glyph> actually raise. It returns a failed Deferred. Consider: Yes, that was my original case, passing a non-generator and getting an attribute error when _inlineCallbacks calls send. That one I knew goes back via the Deferred. glyph> The only thing that (potentially) needs to be done here is to glyph> produce a more useful error message. glyph> The other case, where inlineCallbacks decorates a function that glyph> itself raises an exception rather than returns an object, is the glyph> only way you won't get a Deferred. That's what I was addressing in the code above. If you call the function in unwindGenerator and you get an exception, you 1) know it's not a generator (that's what I didn't understand earlier - calling a function with a yield in it can never give you an exception, Python builds you a generator and gives you that) and 2) can immediately give the exception back via defer.fail (your correction above). That's a simple change and makes sure you always get a Deferred back. Terry

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[Twisted-Python] Weekly Bug Summary
by exarkun＠twistedmatrix.com 23 Nov '08

23 Nov '08

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[Twisted-Python] TLS broken with twisted.words.protocols.jabber
by Jack Moffitt 23 Nov '08

23 Nov '08

I would like to propose that #3463 (http://twistedmatrix.com/trac/ticket/3463) be additionally committed to the 8.1 branch and any other branches that still get point releases. It is a pretty critical workaround which fixes the fact that recent OpenSSL libraries cannot connect to Java based services. This means that most of the packaged versions of Twisted cannot talk to Google Talk or any Tigase or Openfire XMPP servers. Since packagers are often reluctant to upgrade very far in a particular distribution, I would like to get bug fix releases out for Twisted 8.1, etc, so that we have some hope that this problem will go away as soon as possible. jack.

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