Mailman 3 November 2003 - Twisted

[Twisted-Python] Re: Mixmaster Architecture
by Mark Evans Nov. 20, 2003

Nov. 20, 2003

Thank you Moshe Zadka. What you're saying is that TCP connections can trigger ephemeral UDP pseudo-connections. The server communicates over just one UDP port, and data flow is bidirectional at all points in the chain. I'm not sure whether these facts affect the suggestion here. The mixmaster opens its own assigned UDP port to receive data from the server, as well as sending data to the server over another UDP port. > Make up your mind, telnet or raw? a Line-based protocol? You're right,… [View More]

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[Twisted-Python] Woven View factories: defered rendering?
by Michal Pasternak Nov. 20, 2003

Nov. 20, 2003

Hi, I have a webpage, that is rendered via twisted.web.woven.page.Page class. In one of it's wvfactory_ methods, I need to send an e-mail. I would also like to check if sending of the e-mail was successful (eg. mailserver is up, running, and reachable via network). I thought about something like this: def wvfactory_render(self, req, node, model): # do some stuff sendEMail().addCallbacks(self.emailOkay, self.emailFailure) return # what should I return here? def … [View More]

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[Twisted-Python] Mixmaster Architecture
by Mark Evans Nov. 20, 2003

Nov. 20, 2003

Here's an architecture question for Twisted Matrix gurus. I need to implement a "mixmaster" scheme, as follows: |--> Remote client A UDP TCP | Server <---> Mixmaster <---|--> Remote client B | |--> Remote client C | ... (etc.) Here is the background data: Server <---> mixmaster is a custom binary protocol over UDP … [View More]

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[Twisted-Python] another probably very simple question
by Phil Christensen Nov. 20, 2003

Nov. 20, 2003

[whoops, sorry about the previous incomplete message] this is actually the first time i've ever written a PB client in python. since my java client was calling the remote methods out of the awt/swing event thread, i never had to deal with this particular issue. while i'm waiting for the update to the java pb packages (*cough*itamar*cough* ;-) ), i figured it would be worthwhile to do up a text-based client in python. i know this relates to my poor understanding of deferreds, but i just can't … [View More]

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[Twisted-Python] Unable to get the UDP multicasting examples to work
by Alan Rushforth Nov. 20, 2003

Nov. 20, 2003

Hi, This may well be a very trivial question but i have been trying to get the UDP multicasting example in the "how to" section of the twisted documentation to work and have had no success. I can do TCP message and normal UDP but cant multicast it. It does not report any errors but nothing every seems to be received by the echo server. Don't I need to explicitly join the multicast group at any point? The code i have been using is as follows: The multicast client: from twisted.internet.… [View More]

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Re: [Twisted-Python] FTPClient storeFile help.
by Oisin Mulvihill Nov. 20, 2003

Nov. 20, 2003

Hi, Glyph Lefkowitz wrote: > Oisin Mulvihill wrote: > >> I confess I really don't know how to handle the two deferred >> object that get returned by storeFile. I just add callback/ >> errorback for each, this could be the problem. > > > If you want to wait for both, use twisted.internet.defer.DeferredList. > Why are there two deferred objects returned by storeFile? The documentation says: storeFile (self ,path ): Store a file at the given path. … [View More]

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[Twisted-Python] home for ftp goodies?
by Jonathan Simms Nov. 20, 2003

Nov. 20, 2003

I was talking with jp and itamar about the ftp extras. I've implemented an anonymous avatar, a realm, and have begun working on a method or two for filepath permissions checking. I wanted some opinions on how we can separate these extra 'goodies' from the protocol implementation itself. any thoughts?

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[Twisted-Python] looking for twisted Tkinter documentation
by John Benson Nov. 19, 2003

Nov. 19, 2003

Hi, I found the following at http://twistedmatrix.com/documents/howto/choosing-reactor#auto16: ----- Tkinter The support for Tkinter doesn't use a specialized reactor. Instead, there is some specialized support code: from Tkinter import * from twisted.internet import tksupport root = Tk() root.withdraw() # Install the Reactor support tksupport.install(root) An example Twisted application that uses Tk can be found in twisted/words/ui/tkim.py. ----- But I didn't find it in either the twisted … [View More]

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[Twisted-Python] Re: [Twisted-commits] Today is screw with twisted's guts day.
by Andrew Bennetts Nov. 19, 2003

Nov. 19, 2003

On Wed, Nov 19, 2003 at 02:07:39PM -0700, exarkun CVS wrote: > Index: Twisted/twisted/internet/base.py > diff -u Twisted/twisted/internet/base.py:1.67 Twisted/twisted/internet/base.py:1.68 > --- Twisted/twisted/internet/base.py:1.67 Fri Oct 24 12:45:58 2003 > +++ Twisted/twisted/internet/base.py Wed Nov 19 14:07:38 2003 > @@ -400,12 +400,12 @@ > """Run all pending timed calls. > """ > if self.threadCallQueue: > - for i in range(… [View More]len(self.threadCallQueue)): > - callable, args, kw = self.threadCallQueue.pop(0) > + for (f, a, kw) in self.threadCallQueue: > try: > - callable(*args, **kw) > + f(*a, **kw) > except: > - log.deferr() > + log.err() > + del self.threadCallQueue[:] > now = time() > while self._pendingTimedCalls and (self._pendingTimedCalls[-1].time <= now): > call = self._pendingTimedCalls.pop() I think this change introduces a race condition. It's possible for a thread to call callFromThread between the end of the for loop and the del statement. (callFromThread is defined as: def callFromThread(self, f, *args, **kw): """See twisted.internet.interfaces.IReactorThreads.callFromThread. """ assert callable(f), "%s is not callable" % f if threadable.isInIOThread(): self.callLater(0, f, *args, **kw) else: # lists are thread-safe in CPython, but not in Jython # this is probably a bug in Jython, but until fixed this code # won't work in Jython. self.threadCallQueue.append((f, args, kw)) self.wakeUp() ) So I think it's possible to lose thread calls. I *think* this patch will fix it, but more eyeballs are always welcome with threaded code: diff -u -r1.68 base.py --- twisted/internet/base.py 19 Nov 2003 21:07:38 -0000 1.68 +++ twisted/internet/base.py 20 Nov 2003 00:52:08 -0000 @@ -400,12 +400,14 @@ """Run all pending timed calls. """ if self.threadCallQueue: + count = 0 for (f, a, kw) in self.threadCallQueue: try: f(*a, **kw) except: log.err() - del self.threadCallQueue[:] + count += 1 + del self.threadCallQueue[:count] now = time() while self._pendingTimedCalls and (self._pendingTimedCalls[-1].time <= now): call = self._pendingTimedCalls.pop() -Andrew. [View Less]

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[Twisted-Python] Re: Browser oddities and Woven... (Thomas Raschbacher)
by Stuart Hungerford Nov. 19, 2003

Nov. 19, 2003

Quoth twisted-python-request(a)twistedmatrix.com: >| I've developed a Woven application that generates three >| HTML pages, let's call them A, B, and C. >| >| A's render() method does a redirect to B. B's view methods >| generate an XHTML meta tag with the content attribute set >| to a refresh and new URL for C: >| >| <meta content="10;http://example.org/C" http-equiv="refresh" /> >| >AFAIK this would be the correct syntax: ><META name="… [View More]refresh" content="3,http://www.acme.com/intro.html" /> >~ ^ >(ie ',' instead of ';') >http://www.w3.org/TR/WD-html40-970708/struct/global.html#h-7.1.3.2 Many thanks for pointing that out. Unfortunately it makes no difference to the behaviour with IE or Mozilla. I've since tried with Opera 7 and it goes into the endless loop too, which makes me think there's a problem with the (X)HTML my Woven pages are generating and Mozilla is being very forgiving. I've tried adding the equivalent HTTP headers to the request headers in Woven and also run the generated XHTML through the W3C validator. It reported a couple of errors with some <tr> attributes but nothing about the <meta> elements. This is the generated XHTML <head>: <?xml version="1.0"?> <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "DTD/xhtml1-transitional.dtd"> <html xmlns="http://www.w3.org/1999/xhtml" lang="en" xml:lang="en"> <head> <meta content="en-us" http-equiv="Content-Language" /> <meta content="text/html; charset=iso-8859-1" http-equiv="Content-Type" /> <meta content="Pacific And Regional Archive for DIgital Sources in Endangered Cultures " name="description" /> <meta content="digital, digitisation, digitization, pacific, language, music, endangered, university, sydney, melbourne, ANU, australian, national, culture, metadata" name="keywords" /> <meta content="language resource, language resources, language archive, linguistic archive, open archives, metadata, dublin core, controlled vocabulary, linguistics, linguistic data, language data, Pacific, endangered culture, endangered language, musicology, indigneous song" name="keywords" /> <meta http-equiv="refresh" content="5,http://store.apac.edu.au:8181/paradisec/archive/request/download/238/AM3-008-008A.mp3" /> <link href="http://store.apac.edu.au:8181/PARADISEC/resources/css/paradisec.css" type="text/css" rel="stylesheet" /> <title>Downloading your file AM3/008/AM3-008-008A.mp3</title> </head> Cheers, Stu -- :: Stuart Hungerford (stuart.hungerford(a)anu.edu.au) :: ANU Internet Futures Group [View Less]

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