Mailman 3 October 2010 - Twisted

[Twisted-Python] Twisted Python 0.7.0 Prerelease Testing
by Glyph Lefkowitz Aug. 5, 2021

Aug. 5, 2021

hi there, folks: I'd really like to release 0.7.0 but I would like it to be at least a little bit tested before I do so. Could those of you with CVS trees check everything out and see if it performs as advertised? Deeper bugs than that will have to wait for the next release, but I'd at least like to know if it works for someone other than me. Thanks. ______ __ __ _____ _ _ | ____ | \_/ |_____] |_____| |… [View More]

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by Tamika May 1, 2019

May 1, 2019

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[Twisted-Python] regarding xml elements
by Raj kumar Oct. 2, 2013

Oct. 2, 2013

Hi, I have an xml file in my application, I have created an element using Example goes like this......... document.createElement("abc") and i appeneded it by using append() method. But how i can reflect this change to my xml file? and one more thing is i want to create element with some other parameters.... like............. <abc m=" " n=" "> </abc> and i have m and n values as strings with me. can anybody help me to create this element and write it to the existing xml … [View More]

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[Twisted-Python] Get IP of connecting client in XMLRPC server
by Remy C. Cool April 28, 2013

April 28, 2013

Hello, On 18 May 2004, the following message was posted to this mailinglist: Jp Calderone exarkun at divmod.com wrote: >Daniel Newton wrote: > > I have a simple XML-PRC server similar to the example below: > > from twisted.web import xmlrpc, server > > class Example(xmlrpc.XMLRPC): > """An example object to be published.""" > > def xmlrpc_add(self, a, b): > """Return sum of arguments.""" > return a + b def … [View More]

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[Twisted-Python] http.Request and JSON
by Vincent Gulinao Jan. 25, 2012

Jan. 25, 2012

How do you read JSON content from a POST using http.Request. I peeked on args and it's empty. TIA.

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[Twisted-Python] pb.Cacheable doc question
by Stephen Waterbury Nov. 6, 2010

Nov. 6, 2010

First, the "PB Copyable: Passing Complex Types" doc is *great* and the examples are excellent -- my compliments to all who contributed! My question is about the pb.Cacheable section (http://twistedmatrix.com/documents/current/core/howto/pb-copyable.html#auto9) -- specifically the first sentence: 'Sometimes the object you want to send to the remote process is big and slow. "big" means it takes a lot of data (storage, network bandwidth, processing) to represent its state. "slow" means that … [View More]

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[Twisted-Python] Catching all the exceptions in a Twisted program
by Facundo Batista Nov. 6, 2010

Nov. 6, 2010

Hello! I've just subscribed to the list, but I'm using Twisted from a while ago. I need to do something, and wasn't able to find out how to do it. Well, I *did* find out, but it's a horrible hack, and actually depends on something that may be a bug, so it's worth asking here about this :) In a project I'm doing [0], I want to catch all problems (unhandled exceptions), log them and show them in stderr after a bit massaging. My first approach was to hook me in sys.excepthook, and it worked … [View More]

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[Twisted-Python] Immediate removal of cfreactor
by exarkun＠twistedmatrix.com Nov. 1, 2010

Nov. 1, 2010

Hello all, As reported in <http://twistedmatrix.com/trac/ticket/4652>, some problems have arisen with cfreactor. First, recent versions of Pyrex reject the Pyrex source for the support modules. This makes future development on cfreactor difficult (although Glyph's branch does resolve this problem - or at least appears to). Second, the C source files do not build with clang. This seems likely to become more important on future versions of OS X (the only platform where this code … [View More]

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Re: [Twisted-Python] connectionLost never reached after calling loseConnection: stuck in CLOSE_WAIT forever
by Stefano Debenedetti Nov. 1, 2010

Nov. 1, 2010

Hello Jean-Paul, thanks for tracking this down, you rock! I promise that when I'll have payed all by debts I'll buy one of those posters of Exarkun to hang on my wall! JP wrote: > After a few runs, I managed to reproduce the problem. I instrumented the reactor with some extra logging and test_producer.py with a manhole server. > The sequence of events appears to be something like this: > > OneA has a producer of OneE > OneA has a consumer of OneB > At some point OneB … [View More]

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[Twisted-Python] Weekly Bug Summary
by exarkun＠twistedmatrix.com Oct. 31, 2010

Oct. 31, 2010

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[Twisted-Python] kqreactor implemented with select.kqueue for Python26 up
by Werner Thie Oct. 30, 2010

Oct. 30, 2010

Hi all Fiddling with kqreactor on the Mac (SnowLeopard) I came across the docs http://docs.python.org/library/select.html#kqueue-objects May I ask the list: - is somebody working on an implementation of kqreactor with select.kqueue - is implementing kqreactor for Python26 up with select.kqueue() a worthwhile undertaking I only had the best of experiences with FreeBSD for our production servers running with the PyKQueue 1.4 port kqreactor so far, but using kqreactor with a port when a … [View More]

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Re: [Twisted-Python] connectionLost never reached after calling loseConnection: stuck in CLOSE_WAIT forever
by Stefano Debenedetti Oct. 29, 2010

Oct. 29, 2010

Hello Jean-Paul, thanks for looking into this. >>What did make a difference was to comment this line, the problem >>never happens without it: >> >>to.transport.registerProducer(_from.transport, True) > > This suggests that your problem is that you don't unregister the > produce. The connection can never be closed as long as a producer is > registered. Does your code ever unregister this producer? I am 100% sure that I unregister the producer from the … [View More]

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[Twisted-Python] ppa broken ?
by Antoine Mazières Oct. 29, 2010

Oct. 29, 2010

Hi all, It seems that the ppa is broken ? $ uname -a Linux 2.6.35-22-generic #35-Ubuntu SMP Sat Oct 16 20:36:48 UTC 2010 i686 GNU/Linux $ sudo apt-get update [...] W: Failed to fetch http://ppa.launchpad.net/twisted-dev/ppa/ubuntu/dists/maverick/main/source/… 404 Not Found W: Failed to fetch http://ppa.launchpad.net/twisted-dev/ppa/ubuntu/dists/maverick/main/binary-… 404 Not Found E: Some index files failed to download, they have been ignored, or old ones used instead. is it … [View More]

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[Twisted-Python] PySide (Qt4) <-> Twisted reactor integration
by velociraptor Genjix Oct. 27, 2010

Oct. 27, 2010

Hey, I've just checked out http://github.com/ghtdak/qtreactor and it works with PySide. I simply did: try: from PyQt4.QtCore import QSocketNotifier, QObject, SIGNAL, QTimer, QCoreApplication from PyQt4.QtCore import QEventLoopexcept ImportError: from PySide.QtCore import QSocketNotifier, QObject, SIGNAL, QTimer, QCoreApplication from PySide.QtCore import QEventLoop I believe there was an issue before about … [View More]

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Re: [Twisted-Python] PyCon extreme Twisted talk!
by Andrew Francis Oct. 26, 2010

Oct. 26, 2010

Hi Lauren: Message: 1 Date: Thu, 21 Oct 2010 23:47:56 +0200 From: Laurens Van Houtven <lvh(a)laurensvh.be> Subject: [Twisted-Python] PyCon extreme Twisted talk! To: Twisted general discussion <twisted-python(a)twistedmatrix.com> Message-ID: <AANLkTintU98WZc-u7yeRgvZLNDi5M4EsGYmHW1mhmzjE(a)mail.gmail.com> Content-Type: text/plain; charset="utf-8" >Greetings fellow Twisted aficionados! >So, Allen (dash) and I have decided that we were going to co-do the >Twisted … [View More]

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[Twisted-Python] Weekly Bug Summary
by exarkun＠twistedmatrix.com Oct. 24, 2010

Oct. 24, 2010

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[Twisted-Python] ANN: MV3D v0.44 released!
by Michael Handverger Oct. 23, 2010

Oct. 23, 2010

I’m pleased to announce the release of MV3D version 0.44! This version features a functioning content creation and world building tool-set. It is now possible to populate a game world from scratch without using the command line or writing code. Additionally, Ogre3D was upgraded to the latest version and a cluster management app was added. Here’s a video showing off the demo world that is open to the public: http://www.youtube.com/watch?v=9ebqAOWvyzI MV3D is an open source virtual world … [View More]

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[Twisted-Python] PyCon extreme Twisted talk!
by Laurens Van Houtven Oct. 22, 2010

Oct. 22, 2010

Greetings fellow Twisted aficionados! So, Allen (dash) and I have decided that we were going to co-do the Twisted Extreme talk at PyCon US 2011. Extreme talks are like talks, except with less talking and more coding, so preferably something actionable for an entire 45 minutes! That most likely means many steps: start small, and then do something more complex. I think it's probably a good idea to tune for people who understand Python, understand basic networking, but don't really know Twisted … [View More]

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[Twisted-Python] Don't Thread On Me t-shirt proposal
by Laurens Van Houtven Oct. 21, 2010

Oct. 21, 2010

Hi! People following the IRC channel have probably heard about the t-shirt I'm trying to get printed. The idea isn't mine (it belongs to Mike Graham, aka papna), but he told me it's okay if I try to make a shirt out of it. Here's a proposal shirt: it's not *really* the idea that you buy this yet (but you're free to, of course) -- mostly so other people can see how it looks on a shirt. The shirt is intended as a parody of the Gadsen flag ( http://en.wikipedia.org/wiki/Gadsden_flag). Hence the … [View More]

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[Twisted-Python] Getting a list of services and/or plugins are currently running
by Elizabeth Liao Oct. 18, 2010

Oct. 18, 2010

Hi all, I'm looking for a way to get a list of services and/or plugins that currently running on a machine. Does anyone have any suggestions on how to do that? Thanks. Liz

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[Twisted-Python] Twisted protocol instances : a puzzle
by Marcus.CM Oct. 18, 2010

Oct. 18, 2010

Hi, This might seems like a trivial question or at least i would have thought so but it has eluded me for some time on how to do this elegantly. In twisted mail, since the only part where we instantiate an instance of account is under : def requestAvatar(self, avatarId, mind, *interfaces): account = xxinterface() # instantiate our account How do i find out if a particular connection is already dead in the given "account" class? For smtp for example, "mind" is None and avatarId … [View More]

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Re: [Twisted-Python] connectionLost never reached after calling loseConnection: stuck in CLOSE_WAIT forever
by Stefano Debenedetti Oct. 17, 2010

Oct. 17, 2010

Hello Glyph, thanks for your reply and suggestions. I don't have a self-contained sample yet but at least I managed to reproduce it reliably on my installation and after a few more experiments I think I am narrowing this down, please read below. > On Oct 16, 2010, at 11:22 AM, Stefano Debenedetti wrote: > >> Does this sound familiar in any way? Any suggestions off top of head >> while I try to come up with a self-contained sample which is >> reliably reproducing the … [View More]issue I'm seeing happening only "sometimes >> and quite seldom[TM]"? > > I can't recall having seen this exact issue in the past, but as you've described it it sounds like you may have discovered a Twisted bug. I'm looking forward to your example. > > I do have a few questions: > > * What version of Twisted are you using? > * Have you tried a more recent version? Trunk? I'm using 10.1.0. I haven't tested on trunk because I see basically no difference in internet/abstract.py and internet/tcp.py but if you really think I should I will give trunk a try. > * What reactor are you using? > * Have you tried a different reactor? Same behavior with select, poll and epoll. > * What platform/OS are you on? What version? > * Have you tried a different platform? I am using debian lenny with a self-compiled 2.6.35.2 kernel. /etc/debian_version says: 5.0.5 > I am also curious whether changing > > proto.transport.loseConnection() > > to > reactor.callLater(0, proto.transport.loseConnection) > > makes any difference to your example. I tried this and it didn't make any difference. Using a 1 second delay didn't improve things either. What did make a difference was to comment this line, the problem never happens without it: to.transport.registerProducer(_from.transport, True) Next test I did was to try registering the producer as non-streaming: to.transport.registerProducer(_from.transport, False) This also fixes the problem but it causes an exception to be printed in the log once per set of A, B and C connections: Traceback (most recent call last): File "/home/lala/lib/python/twisted/python/log.py", line 84, in callWithLogger return callWithContext({"system": lp}, func, *args, **kw) File "/home/lala/lib/python/twisted/python/log.py", line 69, in callWithContext return context.call({ILogContext: newCtx}, func, *args, **kw) File "/home/lala/lib/python/twisted/python/context.py", line 59, in callWithContext return self.currentContext().callWithContext(ctx, func, *args, **kw) File "/home/lala/lib/python/twisted/python/context.py", line 37, in callWithContext return func(*args,**kw) --- <exception caught here> --- File "/home/lala/lib/python/twisted/internet/pollreactor.py", line 184, in _doReadOrWrite why = selectable.doWrite() File "/home/lala/lib/python/twisted/internet/tcp.py", line 428, in doWrite result = abstract.FileDescriptor.doWrite(self) File "/home/lala/lib/python/twisted/internet/abstract.py", line 145, in doWrite self.producer.resumeProducing() File "/home/lala/lib/python/twisted/internet/abstract.py", line 339, in resumeProducing assert self.connected and not self.disconnecting exceptions.AssertionError: This lead me to change the following lines in the doWrite code in internet/abstract.py: if self.disconnecting: # But if I was previously asked to let the connection die, do # so. return self._postLoseConnection() elif self.producer is not None and ((not self.streamingProducer) or self.producerPaused): # tell them to supply some more. self.producerPaused = 0 self.producer.resumeProducing() #elif self.disconnecting: # # But if I was previously asked to let the connection die, do # # so. # return self._postLoseConnection() Basically this just inverts the order of checks: first check if disconnecting, then check if a producer should be unpaused. This makes the above traceback disappear and still fixes my CLOSE_WAIT problem. But using a non-streaming producer makes my app consume a lot more memory so I reverted back my code to register the producer as streaming: to.transport.registerProducer(_from.transport, True) Now the CLOSE_WAIT issue is gone, no traceback appears in the log and my app consumes the same memory as before. Victory? I will still try to come up with a self-contained sample which reproduces the CLOSE_WAIT problem but in the meanwhile I would like to ask if the above-mentioned change to the doWrite definition in internet/abstract.py is likely to destroy the universe in the near future or if it actually sounds like a good idea. > Thanks, and good luck, > > -glyph Thanks a lot for your help! ciao ste [View Less]

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[Twisted-Python] Weekly Bug Summary
by exarkun＠twistedmatrix.com Oct. 17, 2010

Oct. 17, 2010

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[Twisted-Python] connectionLost never reached after calling loseConnection: stuck in CLOSE_WAIT forever
by Stefano Debenedetti Oct. 16, 2010

Oct. 16, 2010

Hi, I have a similar problem as described in this old mail [1] except that I am not using threads at all. Basically my app is a server that accepts connections from a client (connection A), when A is established it opens connections B and C to another server and forwards data from A to B and from C back to A. Here is how data is forwarded: def forward(_from, to): _from.dataReceived = to.transport.write to.transport.registerProducer(_from.transport, True) def loseConnection(proto, … [View More]

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[Twisted-Python] Twisted Reverse Proxy
by disappearedng Oct. 16, 2010

Oct. 16, 2010

Hello everyone, I am deploying twisted as a web server for my site. I am looking into possibilities of reverse proxying. I have the following code right now hooked up to my reactor for django. I am using comet, and I realize that I absolutely must use port 80 hence I am looking into possibilities of reverse proxying. On this site, I found the following example: # Django setup sys.path.append("shoout_web") os.environ['DJANGO_SETTINGS_MODULE'] = 'shoout_web.settings' def … [View More]

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