Mailman 3 April 2003 - Twisted

[Twisted-Python] epydoc-breaking microdom bug
by jml＠mumak.net April 7, 2003

April 7, 2003

I've just attempted to generate API docs for twisted using epyrun, which uses microdom. This fails when run with CVS latest, giving a "TypeError: unhashable instance" when trying to hash a tuple of microdom.Element and something else. At Moshe's suggestion, I removed the __eq__ methods from microdom in my local copy, and generated the docs again. It generates the docs fine, but tests break. Further, I was told that including the __eq__ methods makes the behaviour of microdom incompatible with that of minidom, and that this is a really bad thing. I'm too zonked to patch things properly atm; could someone please fix microdom and test_xml to not use / rely on __eq__ methods? cheers, jml

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[Twisted-Python] twistctl - start/stop/restart revisited
by Clark C. Evans April 6, 2003

April 6, 2003

Toward the end of the discussion this past morning, we seemed to have come to the agreement that start/stop/restart behavior does not belong in twistd. So, I've taken my original submit and rephrased it as 'twistctl' which is a wrapper on twistd providing those features. To get twistctl to work nicely with twistd, a few refactors in twistd were needed: 1. refactor runApp to factor out the signal code into 'signalApp' so that killApp in twistctl could use it. In general, runApp is quite huge and could use a few breakdowns anyway 2. refactor the code to get the passphrase (if the application is encrypted) and the code which parses options in run() into a 'parseOptions' method so that it can be called from twistctl Neither of these changes affect behavior, they only expose chunks of reusable code for twistctl This is a first pass of this, and I'd like to do two things in the repository: (a) commit the twistd.py.diff changes, and (b) to put twistctl into the sandbox so that people can play with it over the next month or so and after we have a better idea of how it should behave, we can then add it to the scripts directory. The twistctl script needs help in many areas: 1. Moshez objected to the killApp implementation, when I get time I'll look at it. But right now it works on my platform just wonderfully. The beauty of open source projects is that people can hack at it till it works for everyone... 2. The restartApp and startApp behavior are not exactly clear as to how they should use -shutdown.tap and a bit more research and experimenting is needed before this should be formalized. Really, I'm still too new to taps to grok this fully. In particular, Moshez said that he thinks this script should *call* the twistd script via OS methods and thus the refactor above is not needed. I respectfully disagree with his assertion. Calling python from python via python call mechanism is far superior as it allows for better error handling, is less platform dependent, and numerous other factors; such as being able to send a passphrase between the two modules easily. Anyway, please comment. And Glyph, I'd like permission to commit the twistd.py.diff as specified below. Clark

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[Twisted-Python] re: Congrats / a little newbie confusion
by Cory Dodt April 4, 2003

April 4, 2003

Just one more thing to say about this: the installer for Twisted on Windows provides icons in the start menu for a few things, one of which is "Twisted Command Prompt". This prompt runs a very thin batch file which makes all the commands run on Windows "just like unix"; that is, typing c:\>mktap will do what you expect. __________________________________________________ Do you Yahoo!? Yahoo! Tax Center - File online, calculators, forms, and more http://tax.yahoo.com

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[Twisted-Python] Reactor questions
by Jasper Phillips April 4, 2003

April 4, 2003

-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 I notice from expirmentation that reactor.stop() seems to sever any ongoing network connections. Is there a way to temporarily stop then restart the reactor without losing a network connection? Or would I need to write my own reactor? I'm writing unit tests, where I want to script a sequence of events. Currently I have a (pyui) loop calling twisted.internet.main.iterate(), and have my code accept a startup flag telling it whether to stop for procederal input after remote PB calls. This is a bit awkward, and so I'm hoping someone has dealt with this before in twisted. - -Jasper -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.0.6 (GNU/Linux) Comment: For info see http://www.gnupg.org iD8DBQE+i/bG8EpjZ7/X9bIRAg3GAJ90/aobSqyYGy+NgKbDyZYbS/+TNQCgs6sy yOxkTjygUV5T5jUiBCNzBHw= =B+J1 -----END PGP SIGNATURE-----

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[Twisted-Python] Problems with PB and Jelly...
by Jasper Phillips April 4, 2003

April 4, 2003

-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 I'm new to twisted, and attempting to use it for networkable gaming; unfortunately I've run into some problems. I have a Perspective <-> Referenceable server/client setup, and am trying to pass objects between them. Following the online docs I've set all the relavent classes to inherit from pb.Copyable + pb.RemoteCopy, and passed them all to pb.setUnjellyableForClass. However, I still get "Module not allowed" exceptions raised in twisted.spread.jelly.py line 523. Looking more closely, I see that modules are not allowed unless passed to SecurityOptions.allowModules(), which is only called from SecurityOptions.allowInstancesOf(), which is not exposed through pb... In short I don't see how the example code on: http://twistedmatrix.com/documents/howto/pb-copyable could possibly work! Is it indeed necessary to call allowInstancesOf() directly? Hopefully I am just missing something... :-) I'm also unsure what to make of the last bullet under "Things To Watch Out For" on the above webpage. It seems unsure whether using __init__ to initialize transferable objects is ok... Must I truly go and hack all my objects to not use __init__, and instead use setCopyableState()? This, especially when combined with the need to inherit from pb.Copyable + pb.RemoteCopy, seems onerous when compared to the minimal interface of pickle. I would like to be able to simple pass objects of arbitrary classes, provided I've registered them as UnJellyable. Hopefully I'm missing something here as well! Thanks in advance, - -Jasper -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.0.6 (GNU/Linux) Comment: For info see http://www.gnupg.org iD8DBQE+eQVb8EpjZ7/X9bIRAoGmAKDOp/mMXUV0wGG057+CK5Shf75k9ACgu9Cb EuFB62b9vaObg3LZZlJ81jg= =8Dte -----END PGP SIGNATURE-----

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[Twisted-Python] Re: [Twisted-commits] Test circular references
by Itamar Shtull-Trauring April 3, 2003

April 3, 2003

On Thu, 03 Apr 2003 11:33:41 -0600 exarkun CVS <exarkun(a)twistedmatrix.com> wrote: > +testCases = [JellyTestCase, CircularReferenceTestCase] This is not necessary - testCases hasn't been used for a long time. -- Itamar Shtull-Trauring http://itamarst.org/ http://www.zoteca.com -- Python & Twisted consulting

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[Twisted-Python] Congrats / a little newbie confusion
by Jeffrey Mathews April 3, 2003

April 3, 2003

I really enjoyed your talks at PyCon last week, as did pretty much everyone I spoke with. You all did a great job at creating a lot of enthusiasm for twisted. So I come home, and get the 1.0.3 self-installer for windows, as well as the docs and start playing. First thing I notice is that the introductory demo doesn't work, because twistd.py won't run as a script (it has no "if __name__ == '__main__': run()"). I obviously could fix that, but it seems so basic that I worry that I'm just missing something (like I'm not supposed to be using the scripts in /scripts directly). Next question is what happened to support for a FieldStorage-like api in the protocols.http.request module? Googling shows that 0.99.3 had it, but 1.03 doesn't. Is it coming back, or to be replaced by something else? I'd like it for file uploads in a very simple web-based photo album, to share some family shots. Thanks in advance for the help, and again, great job at PyCon. --------------- Jeffrey Mathews 410 336 2279 cell

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[Twisted-Python] PullProducer appreciation, lack thereof.
by Kevin Turner April 3, 2003

April 3, 2003

On Mon, 2003-03-24 at 14:29, radix CVS wrote: > class IPullProducer(IProducer): > """A pull producer, also known as a non-streaming producer, is > expected to produce data each time resumeProducing() is called. > """ > def resumeProducing(self): > """Resume producing data. > This tells a producer to re-add itself to the main loop and produce > more data for its consumer.""" Usage and behaviour of a PullProducer isn't clear to me. Does PullProducer.resumeProducing mean that it should call consumer.write exactly once? Or is the amount of times consumer.write will be called undefined or context-dependent but merely guaranteed to be finite? A PushProducer delivers an undefined quantity of data to consumer.write some unknown time after resumeProducing is called. A PullProducer delivers an undefined quantity of data to consumer.write some unknown time after resumeProducing is called. So why two interfaces? Why don't pulling consumers just use pauseProducing upon getting a .write?[1] Then we can ditch one of the interfaces and the 'streaming' argument to registerProducer and the conditionals that go with it... If it is a different interface, can we give the method a different name? I think it strange that you call "resume" on these when producing has never been "paused". And that "resume" in this case does not signal a return to an ongoing process from which it has been interrupted, but is a single request for a discrete amount of data. A name beginning with "get" or "next" seems more fitting. - Kevin [1] "...just use pauseProducing upon getting a write()?": One answer to that could be "it's more message traffic"; every write in a pull-producer implemented on PushProducer this way would involve p.resume();c.write();p.pause() as opposed to just p.resume();c.write(). But that alone doesn't convince me the interface confusion is worth it. -- The moon is new, 0.3% illuminated, 0.5 days old.

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[Twisted-Python] wxPython and Twisted event loops
by Uwe C. Schroeder April 3, 2003

April 3, 2003

Hi, for those interested, I just posted a recipe on the activestate.com python cookbook about how to get wxPython running with Twisted withoud having blocked menu's and modal dialogs. It's a simple and dirty hack, but it's working on linux and win (basically all systems using the default select reactor) enjoy UC -- Open Source Solutions 4U, LLC 2570 Fleetwood Drive Phone: +1 650 872 2425 San Bruno, CA 94066 Cell: +1 650 302 2405 United States Fax: +1 650 872 2417

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[Twisted-Python] (no subject)
by Andrew Dalke April 3, 2003

April 3, 2003

Itamar Shtull-Trauring: > I'm pretty sure startLogging is called at some point on import? Or how > is the default logging set up? The twiddling of warnings is done during import, and the logfile is set to NullFile. The code looks like this (including the indentation level) import warnings warnings.showwarning = showwarning .... # Prevent logfile from being erased on reload. This only works in cpython. try: logfile except NameError: logfile = NullFile() logerr = sys.stderr The patch I submitted changes matters so that twiddling doesn't occur until startLogging is called. Also, Itamar said: > twisted.python.log is old and crufty. If anyone feels like updating it > (requirements include different channels that can be logged to different > files), feel free. If you do discuss it on the list first, to make sure > everyone has voiced their requirements. Python 2.3 has a generalized logging framework. http://python.org/dev/doc/devel/lib/module-logging.html ] New in version 2.3. This module defines functions and classes ] which implement a flexible error logging system for applications. Andrew dalke(a)dalkescientific.com

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