Mailman 3 April 2013 - Twisted

[Twisted-Python] Connection was closed cleanly.
by Sergey Gerasimov April 10, 2013

April 10, 2013

Hello to all! I see in the log file many failures like: [Broker, client Failure: twisted.spread.pb.PBConnectionLost: [Failure instance: Traceback (failure with no frames): < class 'twisted.internet.error.ConnectionDone'>: Connection was closed cleanly.] All communications via PB use loopback in my program. I don't see any unhandled exceptions.. What is reason of these errors? Sergey.

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[Twisted-Python] Implementing a new stream transport
by Phil Budne April 10, 2013

April 10, 2013

I looked for, but haven't (yet) found any documentation on how to implement a Twisted "transport" For some testing and prototype work I'm doing I implemented the proprietary TCP connection multiplexing protocol a customer of mine uses as a Twisted Protocol and a transport for the "channels" that are multiplexed inside the real TCP connection. When I tried running a twisted.web.server.Site Protocol on my new "channel" transport I found I was missing members and methods in the transport class. As a quick crock, I made my transport a subclass of twisted.internet.tcp.Server, and got away with it, but I'd like to do the right thing. I'd be delighted to find out that mixins exist that would solve my problem, but I'd be happy to know what interfaces I need to implement, or even better where I find find documentation on how to implement a new "transport", especially one that isn't file-descriptor based. Thanks! Phil

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[Twisted-Python] use twisted get ftp's version
by yuyan zhang April 10, 2013

April 10, 2013

i use nc command bash-3.2# nc 83.85.85.238 21 220 (vsFTPd 2.0.5) get the version of the ftp but i want to use twisted to do this,and i don't know the function can anyone help me? Thank you very much.

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[Twisted-Python] Implementing Download Manger for GSoC 2013
by Indradhanush Gupta April 9, 2013

April 9, 2013

Hello, I was wondering that whether implementing a download manager could be an interesting project idea this year at GSoC. Needless to say, it would have pause/resume support along with multiple download at the same time. Looking for feedback. Thanks! -- Indradhanush Gupta

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[Twisted-Python] Why is this epytext docstring bad?
by Laurens Van Houtven April 9, 2013

April 9, 2013

Hi, I'm trying to get twisted.positioning landed, but it's blocking on an invalid epytext docstring. I've stared at this docstring a few times in the past weeks, but that didn't help. Failing buildbot log: https://buildbot.twistedmatrix.com/builders/documentation/builds/3141/steps… Docstring: https://twistedmatrix.com/trac/browser/branches/positioning-3926-2/twisted/… If someone could tell me what's wrong with it, that'd be much appreciated :) -- cheers lvh

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[Twisted-Python] Custom Scheduler
by Gerrat Rickert April 8, 2013

April 8, 2013

Some background: I have implemented a "relative frequency scheduler". Tasks added to it are run with frequencies relative to one another - basically, if tasks 1-3 have relative frequencies of 1,2, and 3 respectively, then task 2 is run 1/2 as often as task 1, and task 3 is run 1/3 as often. The tasks are all generators, so each iteration of the scheduler yields one item from one of its scheduled generators. The scheduler will also run tasks on both a periodic basis (ie.run this task every X other tasks), as well as running tasks on a timed basis (ie. every X seconds). I'd like to use twisted in the same program to do some network I/O as well as database interaction. I did a small test with adding a task that calls both: reactor.doIteration(0) and reactor.runUntilCurrent() to my scheduler, and that seems to run both the network I/O, and the database interactions. I was wondering if there were other issues with this type of setup? I can't find any examples online of using other schedulers with twisted. I glanced briefly at t.i.task.Cooperator, but I don't really need deferreds for any of the CPU stuff, and I'm not really sure how I could replace its scheduler with a non-reactor based one. Thanks for any insight, Gerrat

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[Twisted-Python] Weekly Bug Summary
by exarkun＠twistedmatrix.com April 6, 2013

April 6, 2013

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[Twisted-Python] Release questions
by Thomas Hervé April 5, 2013

April 5, 2013

Hey everyone, During the latest release process, I was left with several things to clarify, so now that it's done I think it's time: * We started building wheels for Windows. What do we do with me, should we upload it to pypi? What happens when users try them? * Glyph mumbled something about sha sums of the release files, instead of md5. Should we pursue that? We may need to update some trac integration code. * There are several issues with SVN and the release branch. First the Quotes file conflicts almost all the time. But this time we also reverted a branch from trunk during the release, and then merged it again, which created all sorts of troubles. Maybe we (I) just need to write some documentation about it. But if anyone has an idea on how to improve our tools, they are welcome. Thanks! -- Thomas

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[Twisted-Python] Twisted 13.0.0 released
by Thomas Hervé April 4, 2013

April 4, 2013

On behalf of Twisted Matrix Laboratories, I am pleased to announce the release of Twisted 13.0. Among the 70 tickets closed, we can see: * A new "Introduction to Deferreds" document that you can find here: http://twistedmatrix.com/documents/13.0.0/core/howto/defer-intro.html * A fix in twisted.web.template where attributes were not quoted properly, risking HTML injection. * Support for unicode domain names in twisted.names SRVConnector and Name classes, after a 12.3 regression. * A workaround for platform limitations when trying to schedule events far in the future. For more information, see the NEWS file here: http://twistedmatrix.com/Releases/Twisted/13.0/NEWS.txt Download it now from: http://pypi.python.org/packages/source/T/Twisted/Twisted-13.0.0.tar.bz2 or http://pypi.python.org/packages/2.7/T/Twisted/Twisted-13.0.0.win32-py2.7.msi Thanks to the supporters of Twisted via the Software Freedom Conservancy and to the many contributors for this release. -- Thomas

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[Twisted-Python] Current callback best practices
by Hynek Schlawack April 3, 2013

April 3, 2013

Hi, I’ve asked this one already at the Twisted dinner (thanks again for it, it was probably my PyCon highlight) and got various answers from people sitting around me. I’m still indecisive so I’d like to gather even more opinions[1]. I already tried to ask on IRC but my time zone is just not very #twisted friendly so I got zero replies. My question can be simplified to: Closures yes or no? They seem *really* handy since they allow to have some data present without handing it through all the time. Eg in my cred checker, I can refer to the user name from the closure instead of passing it around all the time – making the code much cleaner. Also most current examples and callbacks-are-hard-FUD-rebuttals seem to use them. OTOH, private methods like `_cbPrintResult` are nicer to test individually. If “yes, closures”: Still using cb/eb prefixes? I don’t see them very often in recent examples. What about addBoth handlers? Bonus points for the preferred style for the Twisted code base. Thanks in advance & thank you for your time, Hynek [1]: I’d be glad if people from the dinner replied again too so I/we have it in written form, my memory tends to be rather sloppy.

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