Mailman 3 August 2004 - Twisted

Re: [Twisted-Python] Twisted is now under the MIT license.
by Sergio Trejo 26 Aug '04

26 Aug '04

>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 Laboratories is neither a human or an artificial person in any territory, then I think its a major issue not a minor one. Copyright is not assignable to a ghost or a shadow. > >-Andrew. _________________________________________________________________ MSN 8 with e-mail virus protection service: 2 months FREE* http://join.msn.com/?page=features/virus

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Re: [Twisted-Python] Twisted is now under the MIT license.
by Sergio Trejo 25 Aug '04

25 Aug '04

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.) _________________________________________________________________ Add photos to your messages with MSN 8. Get 2 months FREE*. http://join.msn.com/?page=features/featuredemail

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Re: [Twisted-Python] Twisted is now under the MIT license.
by Sergio Trejo 25 Aug '04

25 Aug '04

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 <twisted-python(a)twistedmatrix.com> >To: twisted-python(a)twistedmatrix.com >Subject: Re: [Twisted-Python] Twisted is now under the MIT license. >Date: Thu, 26 Aug 2004 02:50:01 +0000 > >On Wed, Aug 25, 2004, Andrew Bennetts wrote: > > To be clear on this: contributions are now *only* copyright their > > authors, (rather than the previous joint copyright-assignment to > > glyph)? And so when you say "copyright holders", you're referring to > > everyone that has copyright in any part of Twisted's source, rather > > than saying that everyone is now joint holders of copyright? > >This was more or less my question too. Given that I got "this is how >lots of open source projects do it!" as a response, I'm going to assume >the former, because the latter doesn't seem that common. > >-Mary > >_______________________________________________ >Twisted-Python mailing list >Twisted-Python(a)twistedmatrix.com >http://twistedmatrix.com/cgi-bin/mailman/listinfo/twisted-python _________________________________________________________________ Tired of spam? Get advanced junk mail protection with MSN 8. http://join.msn.com/?page=features/junkmail

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Re: [Twisted-Python] Twisted is now under the MIT license.
by Sergio Trejo 25 Aug '04

25 Aug '04

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)gmail.com> >Reply-To: radix(a)twistedmatrix.com,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 19:10:05 -0400 > >To Mary and Alex: > >Ask a lawyer (or someone else who's silly enough to answer :). > >This is how a lot of open source project's are run. ESR's Licensing >HOWTO may or may not be accurate, but if you assume it is correct, it >is enlightening. > >-- > Twisted | Christopher Armstrong: International Man of Twistery > Radix | Release Manager, Twisted Project >---------+ http://radix.twistedmatrix.com > >_______________________________________________ >Twisted-Python mailing list >Twisted-Python(a)twistedmatrix.com >http://twistedmatrix.com/cgi-bin/mailman/listinfo/twisted-python _________________________________________________________________ The new MSN 8: advanced junk mail protection and 2 months FREE* http://join.msn.com/?page=features/junkmail

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Re: [Twisted-Python] Twisted is now under the MIT license.
by Sergio Trejo 25 Aug '04

25 Aug '04

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 -0400, Christopher Armstrong wrote: > > To Mary and Alex: > > > > Ask a lawyer (or someone else who's silly enough to answer :). > >I doubt a lawyer could answer Alex's question about the rationale for the >change :) > >-Andrew. > > >_______________________________________________ >Twisted-Python mailing list >Twisted-Python(a)twistedmatrix.com >http://twistedmatrix.com/cgi-bin/mailman/listinfo/twisted-python _________________________________________________________________ The new MSN 8: smart spam protection and 2 months FREE* http://join.msn.com/?page=features/junkmail

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[Twisted-Python] ENOBUF and Twisted
by screwtape＠froup.com 24 Aug '04

24 Aug '04

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 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 |

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[Twisted-Python] Diagraming Twisted apps
by Sergio Trejo 22 Aug '04

22 Aug '04

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 programs that can parse code based on twisted which automatically generates visual representations of flows and logic? Has anyone tried using Dia? Serg _________________________________________________________________ The new MSN 8: advanced junk mail protection and 2 months FREE* http://join.msn.com/?page=features/junkmail

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[Twisted-Python] deferToThread question
by Michele Petrazzo 20 Aug '04

20 Aug '04

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 right? S.O. win2k and mdk10, both with py 2.3.4, twisted 1.3.0, wxpy 2.4.2 and user of wxsupport, not wxreactor. Thanks, Michele Petrazzo

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[Twisted-Python] catching adbapi 'thread' failures
by Clark C. Evans 19 Aug '04

19 Aug '04

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.getErrorMessage().strip() + "***" def use_pool(): d = dbpool.runInteraction(interaction) d.addErrback(catch) d.addCallback(println) d.addCallback(lambda _: reactor.stop()) reactor.callLater(0, use_pool) reactor.run() Any help would be wonderful, Clark -- Clark C. Evans Prometheus Research, LLC. http://www.prometheusresearch.com/ o office: +1.203.777.2550 ~/ , mobile: +1.203.444.0557 // (( Prometheus Research: Turning Data Into Knowledge \\ , \/ - Research Exchange Database /\ - Survey & Assessment Technologies ` \ - Software Tools for Researchers ~ *

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[Twisted-Python] including plugins.tml in a package
by Abe Fettig 19 Aug '04

19 Aug '04

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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