Mailman 3 December 2003 - Twisted

[Twisted-Python] Asking for suggestions in new-new ftp server implementation
by Jonathan Simms 18 Dec '03

18 Dec '03

I've got a newly-refactored version of FTP in my sandbox. I'm not sure, however, how to deploy it into the library. It splits the actual protocol code and the server-y aspects into two files, ftp and ftpdav. I feel that the protocol implementation should be separate from the code that integrates the protocol with cred, i'm just unsure about where that cred-code should go. Also, there's been some considerable trouble caused by the fact that my avatar implemenation is not windows-friendly. Any thoughts on how to either adapt it, or if some kindly windows-user could implement a windows-compatable version, would be greatly appreciated. Also, on a tangent, the new (-new) ftp protocol refactoring in my sandbox has much more complete code-coverage in terms of the unittests. I await your suggestions before taking further action. -Jonathan Simms

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Re: [Twisted-Python] [WISH] pygame reactor
by Brian Warner 17 Dec '03

17 Dec '03

> My hope is, now that pyui is somewhat death or windows only, to have a > pygame reactor maybe using pygame.event.wait() which idles till a > pygame event comes. Perhaps as a way of getting started, Paul Boehm posted the following code to this list in October of 2002. Unlike Twisted, pygame isn't very quiescent, so there isn't a way to just sleep until something needs to be done. Instead, in this code, twisted runs the pygame update routine as frequently as necessary to achieve the desired frame rate. This probably has implications for response latency to joystick events, etc.. I haven't actually tried to run this in a long time (since about November of 2002 :). -Brian # MyGame embedded in Twisted from pygame import time from twisted.internet import reactor import mygame class PygameTimer: def __init__(self, game): self.clock = time.Clock() self.game = game self.update() def update(self): self.clock.tick() self.ms = self.clock.get_rawtime() framespeed = (1.0/100.0) * 1000 lastspeed = self.ms next = framespeed - lastspeed print "framespeed", framespeed, "ms", self.ms, "next", next, "fps", self.clock.get_fps() self.game.iterate() if self.game.want_quit: self.game.cleanup() reactor.stop() else: reactor.callLater(next/1000.0*2.0, self.update) if __name__ == "__main__": pt = PygameTimer(mygame.Game()) reactor.run()

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[Twisted-Python] [WISH] pygame reactor
by Valentino Volonghi aka Dialtone 17 Dec '03

17 Dec '03

Hi all, looking at twisted I see that there is a very simple pyui support but not pygame support. My hope is, now that pyui is somewhat death or windows only, to have a pygame reactor maybe using pygame.event.wait() which idles till a pygame event comes. And maybe also a protocol implemented using the event.type value (onMouseButton1, onKeyPressed, onKeyReleased and so on). I think that this would be a really interesting and useful feature to have and would simplify a lot the design of fully featured gui toolkits in pygame. I may help in coding this stuff into twisted although I'm don't know it well enough. -- Valentino Volonghi, Regia SpA, Milan Linux User #310274, Gentoo Proud User

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[Twisted-Python] Twisted Web server (and possibly other applications) slow performance with many connections
by Michal Pasternak 17 Dec '03

17 Dec '03

Hi, I'm testing a bit the performance of Twisted Web, using puf(1) downloader and loopback interface. Puf is something like wget(1), only it can do many simultaneous connections. When the maximum connection no. is small (1 - 40 connections at once), Twisted Web works very good, providing a reasonable page generation time (thus, data transfer rate) and eating my CPU. But if I raise the simultaneous connection number to something above 40, data transfer rate and CPU usage fall. Is it intended behaviour? I don't think I'll ever have to program a site, which has to serve more, than 40 connections at once, but in case this happens, I'd like to know. Regards, -- Michal Pasternak :: http://pasternak.w.lub.pl :: http://winsrc.sf.net

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[Twisted-Python] Session trouble
by Michal Pasternak 16 Dec '03

16 Dec '03

Hi, On a page of the site I've got a form. The user enters values and submits the form. Entered values are saved to session. If s/he gets back to the page (=> encounters the same form), values are loaded from the session and the form is filled with them. Everything worked okay, until I turned on caching. Now, even if the test machine is on different subnet, the filled values are presented to all connected users by default (eg. my friend, while testing it, enters some data; I open a "clean" browser, without any cookies or such, enter the page with the form - and I get the same data he entered!). My question is simple: how do I get around this? Should I turn off the caching (which speeds up page generation significantly, so I'd rather say it's required)? Is it known issue? What am I doing wrong? Where should I RTFM? I run the site server with twistd and RPY script. This is my RPY script: cache() import myWeb resource = myWeb.RootPage() This is how I save / load session values in myWeb: I have declared: class IPreferences(components.Interface): pass class Preferences(components.Adapter): __implements__ = IPreferences components.registerAdapter(Preferences, server.Session, IPreferences) Then, when I'm loading/saving values from/to session, I use: prefs = req.getSession(IPreferences) -- Michal Pasternak :: http://pasternak.w.lub.pl :: http://winsrc.sf.net

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[Twisted-Python] Twisted Web sessions
by Michal Pasternak 16 Dec '03

16 Dec '03

Hi, how do I protect from session-hijacking when using Twisted Web? Is it the same as with PHP -- or do you, Twisted guys, already think out of something? Take care, -- Michal Pasternak :: http://pasternak.w.lub.pl :: http://winsrc.sf.net

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[Twisted-Python] Patch submission ?
by Thomas Favier 16 Dec '03

16 Dec '03

Hi, I'd like to know what is the standard way of submitting patches. From what I've read on the ML, patches should be sent to the tracker. I did so, but my small submission didn't even get read... So is the standard way : 1. post to ML 2. have response about the bug tracker thing 3. post it to bug tracker ? It seems a good way to be sure that at least someone knows the patch exists ;) My submission is Issue371, submitted on Oct 28. It is a small patch to restore the possibility to give the host you want to query in HTTPPageGetter (usefull for monitoring real servers in a load-balanced architecture). Moving to 1.1.1 this morning, my app choke on this... I don't mind patching my sources at every upgrade, but I'd like to know how to be sure that patches are at least read ;) Anyway thanks for that great piece of code. Thomas.

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[Twisted-Python] Twisted reactor
by Hegedus, Matthew S 15 Dec '03

15 Dec '03

I want to have a piece of software that listens for UDP packets on multiple ports. It listens TCP for a connection that will tell it what UDP ports to listen to. The UDP ports change dynamically. I guess I can always do a reactor.listenUDP(port) whenever I need to listen on additional ports, but how do I get the reactor to stop listening on a particular port? Thanks, Matthew

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[Twisted-Python] PyCon submissions now accepted
by Itamar Shtull-Trauring 15 Dec '03

15 Dec '03

Dear Python User: I am pleased to be able to announce that the submission process for PyCon DC 2004 is now open. Please direct your browser to http://submit.pycon.org/ and create your account by entering your email address and leaving the password field blank - a password will be sent to you by email, and you can submit your paper! Please remember that your submissions should ideally be in a single file, containing HTML or the reStructured Text format. Ultimately we would like to publish all accepted papers on the web, and these rules should make it easier to do so. Send enquiries about other formats to pycon-organizers(a)python.org If your paper is accepted and you prepare an electronic presentation (in PDF, PythonPoint or PowerPoint) we will also happily publish that on the web site when PyCon is over. We are interested in any and all submissions about uses of Python and the development of the language. Since there is expected to be a strong educational community presence for the next PyCon, teaching materials of various kinds are also encouraged. Please help us to make the next PyCon even better than the first one. See you in March! Sincerely Steve Holden Chairman PyCon DC 2004

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Re: [Twisted-Python] long-lived database transaction
by dave＠krondo.com 15 Dec '03

15 Dec '03

> On Sun, 2003-12-14 at 09:21, Federico Di Gregorio wrote: > > Il dom, 2003-12-14 alle 17:48, Dave Peticolas ha scritto: > > [snip] > > > Evidently not impossible, as Bill Gribble has a patch adding > >=20 > > eheh. yesss. i should have added "without leaving a thread suspended". > > my fault. > >=20 > > > this support to the existing adbapi.py. But it still may be > > > simpler to support an extended transaction api by going away > > > from a thread pool. In either case, we should not have two > > > separate modules. > >=20 > > agreed. see my later mail; Bill's patch is fine if we can get it in. >=20 > I'd like to have some tests for it before it goes in. > I might have some time over holiday break to work on > some. > i can do the tests too. can we coordinate over irc or IM? During the week I don't actually have irc/im access or even access to a machine I can work on, for now. So feel free to get started and we can sync up this weekend. dave

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