Mailman 3 August 2004 - Twisted

Re: [Twisted-Python] Twisted is now under the MIT license.
by Sergio Trejo Aug. 26, 2004

Aug. 26, 2004

>Also, the new source file boilerplate says: > > # Copyright (c) 2001-2004 Twisted Matrix Laboratories. > # See LICENSE for details. > >But as far as I know, Twisted Matrix Laboratories isn't a legally >recognised >organisation (in any country), and regardless it isn't mentioned in the >LICENSE file, despite the boilerplate's promise that it would have details. >This is probably a minor issue, but it is confusing. If its true that Twisted Matrix … [View More]

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Re: [Twisted-Python] Twisted is now under the MIT license.
by Sergio Trejo Aug. 26, 2004

Aug. 26, 2004

I have yet to read the MIT license, but am wondering if it is unilateral in that it only is eforceable under U.S. law? Or does the United Nations recognize the MIT license for enforceability issues? Side note: Microsoft announced yesterday that they're withdrawing from the U.N. Cefact (this makes me nervous about U.S. laws and big corporations like Microsoft who try to wield influence on other countries as well as the U.N.) _________________________________________________________________ … [View More]

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Re: [Twisted-Python] Twisted is now under the MIT license.
by Sergio Trejo Aug. 26, 2004

Aug. 26, 2004

Mary, I am curious as to how Australians view U.S.-centric IPR issues such as licenses (e.g., GPL/LGPL) and patents. I read yesterday on Slashdot (and would need to confirm this yet) that Microsoft has filed some ungodly amount of U.S. patents (I think 5,000). The IPR patent issue is a sticky one lately in Europe and I'm curious about Australia / New Zealand viewpoints. Cheers, Serg >From: Mary Gardiner <mary-twisted(a)puzzling.org> >Reply-To: Twisted general discussion <… [View More]

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Re: [Twisted-Python] Twisted is now under the MIT license.
by Sergio Trejo Aug. 25, 2004

Aug. 25, 2004

Radix, With all due respect, what if I am living in Mexico -- should I just waltz down to my local neighborhood attorney in Guadalajara and expect him/her to be able to give me advice about any U.S.-centric intellectual property related license? I'm not sure what the better answer is, but I don't know that it is fair to expect every person who wants to contrbute code to Twisted to have to consult with a lawyer in their non-U.S. country. Serg >From: Christopher Armstrong <radeex(a)… [View More]

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Re: [Twisted-Python] Twisted is now under the MIT license.
by Sergio Trejo Aug. 25, 2004

Aug. 25, 2004

Glyph - maybe we missed why the change. Can you point us to a URL that describes why the change? Thanks. Serg >From: Andrew Bennetts <andrew-twisted(a)puzzling.org> >Reply-To: Twisted general discussion <twisted-python(a)twistedmatrix.com> >To: Twisted general discussion <twisted-python(a)twistedmatrix.com> >Subject: Re: [Twisted-Python] Twisted is now under the MIT license. >Date: Wed, 25 Aug 2004 17:33:22 -0700 > >On Wed, Aug 25, 2004 at 07:10:05PM -… [View More]

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[Twisted-Python] ENOBUF and Twisted
by screwtape＠froup.com Aug. 24, 2004

Aug. 24, 2004

A colleague of mine was working with a server written in Twisted today, and he ran into a problem involving Twisted. He called me over (since I'm supposed to be the Python Guru here, which just means I'm slightly less ignorant than everybody else :) and we tracked the behaviour in question all the way down to twisted.internet.tcp. The situation is this: we have an upstream data provider who sends us data intermittently, all day. We have downstream clients on less reliable connections who want … [View More]to recieve it. We have a sort of caching proxy in the middle that keeps track of all the data sent so far today, and every time a client connects we send them the total record of the day's events, and then send them new updates as they arrive. The problem occurred one day when we had a higher-than-usual amount of data incoming. The symptom was that any client attempting to connect would be immediately disconnected for No Obvious Reason. After some ferretting about through the codebase, we discovered that the 'writeSomeData' method of twisted.internet.tcp.Connection was getting an error it couldn't handle and dropping the connection. The swift insertion of a debugging printf showed that the error generated was ENOBUFS (Well, WSAENOBUFS, since it was running on Windows 2000), which made the Connection drop the, uh, connection immediately. Now, it occurs to me that ENOBUFS does not necessarily mean that the connection is irretrievably lost, it should be treated more like EWOULDBLOCK, except that buffers over a certain size will never, ever fit. I don't know whether special handling of ENOBUFS should happen in Twisted (to match its already-existing special handling of EWOULDBLOCK), or whether it should happen in the application (proper buffer-size autodetection might be a little intricate for a class like Connection that's supposed to be simple). But either way, just dropping the connection immediately is probably a Bad Thing. (for the record, the buffer we were trying to send was about 5MB, but I assume people trying to send, say CD or DVD disk images via twisted.web may well run into similar issues) Is there some clever way to get around this with the current version of Twisted? If I were to write a patch, how should I best attack the problem? Are there any other questions I should be asking? :) -- ___________ ___________________________________ | Screwtape | http://livejournal.com/~thristian |______ _____ ___ __ _ _ _ | | "It's a giant beetle! Of course it doesn't have a kitchen!" -- T&R, 2002-07-07 | [View Less]

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[Twisted-Python] Diagraming Twisted apps
by Sergio Trejo Aug. 22, 2004

Aug. 22, 2004

I have truly enjoyed working with the Twisted Framework in recent weeks and have delved into Nevow, Atop, PB, and Twisted.web. I am creating an application with all of these components and am finding that my application is growing and becoming a bit complex. In order to keep track of the complexity of asynchronicity (deferreds, etc.), I am wondering what, if any, diagramming tools twisted developers use for designing visual schematics to accompany their projects? Are there any such … [View More]

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[Twisted-Python] deferToThread question
by Michele Petrazzo Aug. 20, 2004

Aug. 20, 2004

I want to call a block function. I use deferToThread to call it, so something like this: def block_func(): os.popen3(my_soft) #my_soft is a blocking software print 1/0 # Simulate an error If I use normal (not defer) call, so: block_func(), the exception is raised after my_soft is closed. I i call block_func with defer, so: def block_func_err(err): print err t = threads.deferToThread(block_func) t.addErrback(block_func_err) the error is raised before my_soft is closed. Why? Is it … [View More]

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[Twisted-Python] catching adbapi 'thread' failures
by Clark C. Evans Aug. 19, 2004

Aug. 19, 2004

Howdy. I'm stumped. I thought I knew how failures work, but I can't seem to stop a traceback from appearing with the following: from twisted.internet import reactor from twisted.python.util import println from twisted.enterprise import adbapi dbpool = adbapi.ConnectionPool('pyPgSQL.PgSQL', database='testing') def interaction(trans): trans.execute('sqlerror') return trans.fetchall()[0][0] def catch(failure): return "***" + failure.… [View More]

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[Twisted-Python] including plugins.tml in a package
by Abe Fettig Aug. 19, 2004

Aug. 19, 2004

Hi folks, It's come to my attention that my current Hep package for windows (packaged using bdist_win32) doesn't put the plugins.tml file where it should be (under site-packages/hep). In googling around for a solution, I came across this post: http://twistedmatrix.com/pipermail/twisted-python/2002-October/001814.html Which describes using an "undocumented hack" in distutils to get the plugins.tml in the right place. Is that the correct way to do this? Thanks, Abe

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