Twisted-web July 2005

twisted-web@python.org

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Test
by Philippe Lafoucrière 05 Aug '21

05 Aug '21

Hi all just a test

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XML-RPC and None
by Matt Feifarek 09 Sep '05

09 Sep '05

Hello. We're using twisted.web.xmlrpc to serve an xmlrpclib client, so python-to-python. We'd like to pass None through the rpc connection on occasion. There's a flag in the standard lib to allow this to serialize ( send allow_none=True to the xmlrpclib.Server() ) We're getting this error from the twisted resource when we try to serialize 'None': Fault: <Fault 8002: "can't serialize output"> I know that the twisted resources uses the stock xmlrpclib, but how can we tell it to allow None to serialize the twisted way? Thanks.

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Introduction, newbie confusion plus an offer
by lloyd＠paisite.com 07 Aug '05

07 Aug '05

Hello, I'm Lloyd, I'm baffled, and I'd like to offer my modest talents to help others like me come up to speed with Twisted.web in record time. I've been looking for a way to bring a large ColdFusion application over to Python. Twisted.web looks to offer all that I could wish for and more. The work to date is awe-inspiring. But... the documentation, well-intentioned as it is, and much more ample than in many Open Source projects, truly baffles me. I'm first to admit my limitations: I'm still in the early learning stages of Python; I understand OO conceptually, but have little experience writing or reading OO code; and, approaching the golden years, undoubtably have far fewer functioning neurons than most of the subscribers to this list, much less the brilliant young turks who have created the Twisted framework. But, browsing through the archives, it's clear that I am not alone in my confusion. So, I'd like to make a proposal: I have many years of writing and editing experience. Back in the days when personal computers were still connected to audio cassette recorders, and I was as excited but unenlightened about PCs as I am now about Twisted, I contributed three well-received articles to Personal Computing magazine under the name Techo Turkey. These helped readers hook up IBM Selectric Terminals to their new PCs, create a computer-controlled haunted house for Halloween, and set up a computer-controlled home security system. I would like now to offer to write some supplementary documentation for Twisted.web aimed at turkeys like me -- the really really basic stuff plus sure-to-work examples that can bring even Mickey-the-Dunce to sufficient level of understanding that he can participate creatively in the Twisted community. The catch: I need knowledgeable folks willing to answer my many many stupid questions like, once you've installed Twisted from, say, Debian, where should what files go and how should permissions be defined? Undoubtably these generous mentors would also need to critique my newbie code and perhaps, even, submit examples of their own. Who know, maybe we could even get a book out of it. Any takers? Best wishes, Lloyd

9 14

Right way to implement layout objects with Nevow?
by Leif K-Brooks 30 Jul '05

30 Jul '05

For the Nevow-based application I'm coding, I want to have a standardized layout with a header and footer. The layout needs to be implemented as an object, so that a new one can be swapped in without having to change the code. A simplified version of the code I'm using looks like this: class Layout(rend.Fragment): docFactory = loaders.xmlstr(''' <html xmlns:nevow="http://nevow.com/ns/nevow/0.1"> <head> <title>Foo</title> </head> <body> Header... <nevow:invisible nevow:data="body" nevow:render="data"/> Footer... </body> </html> ''') def data_body(self, context, data): return self.original class Resource(rend.Page): docFactory = loaders.xmlstr(''' <html xmlns:nevow="http://nevow.com/ns/nevow/0.1" nevow:render="withLayout"> <body nevow:pattern="body"> Hello, world! </body> </html> ''') def render_withLayout(self, context, data): return Layout(inevow.IQ(context).onePattern('body').children) This works fine for a simple static page like the one in the example, but if I add nevow:render="foo" to an element in the page, it gets looked up as as Layout.render_foo instead of as Resource.render_foo. I can fix that by making Resource.render_withLayout call flatten() on the page's body, but that causes Deferred data to stop working. Is there a better approach?

1 1

using livepage
by John Horton 28 Jul '05

28 Jul '05

Hi I have looked through the examples and the archives but cannot find what I am looking for. I need to be able to create a piece of HTML that is updated once a second via livepage. currently my html looks like <html><head></head> <body> <nevow:slot name="time" /> </body></head></html> and the python looks like def render_time(self, context, data): context.fillSlots('time', '%s' % time.ctime()) return context.tag but I need to refresh the browser to update the time - can anyone point me in the right direction so that the time is constantly updated? Thanks John This message has been scanned for viruses by BlackSpider MailControl - www.blackspider.com

2 1

re: nufox
by Timothy Stebbing 27 Jul '05

27 Jul '05

oops, I guess an URL is customary.. http://trac.nunatak.com.au/projects/nufox -tjs

2 2

nufox
by Timothy Stebbing 27 Jul '05

27 Jul '05

G'day, I just thought that I would make a little project announcement about something I've been tinkering with for the past week or two. NuFox is a server-side XUL toolkit written on top of nevow. It uses a customised stan dialect with xml namespace support as well as livepage (nevow svn head version), and then abstracts that all away into a more python-gui-toolit-like API. Its very early in development but its already pretty powerful in terms of what you can do with it, check it out and play with some of the examples. Feedback is most welcome. -tjs

1 0

Custom __del__ not run
by Rasjid Wilcox 26 Jul '05

26 Jul '05

Hello again. I have my xmlrpc class that I am running in twisted. I want it to do some cleaning up when it is finished, and so I have defined a custom __del__ procedure. However, when mixed with a looping call, it never gets called. Sample code below. Remove the two lines starting with self.looping, and it all works as expected. Put them in, and the custom __del__ is not called. Is this a bug in twisted? Or have I broken some twisted rule about using __del__ procedures? Is there some other way of saying 'when you have stopped the reactor, do foo', that twisted would be happy with? Any suggestions welcome. :-) Thanks, Rasjid --------------------------------- from twisted.web import xmlrpc import xmlrpclib from twisted.internet import reactor, task class Hello(xmlrpc.XMLRPC): def __init__(self): print 'Init class Hello' # the following two lines cause the custom __del__ # function to never be called self.looping = task.LoopingCall(self.foo) self.looping.start(5) def __del__(self): print 'Tidy up class Hello' def foo(self): print 'foo!' def xmlrpc_hello(self): """Return 'hello, world'.""" return 'hello, world!' def xmlrpc_quit(self): reactor.callLater(0.1, reactor.stop) return 'Shutting down server' def main(): from twisted.web import server r = Hello() reactor.listenTCP(7080, server.Site(r), interface = '127.0.0.1') reactor.run() if __name__ == '__main__': main() -- Rasjid Wilcox Melbourne, Australia (UTC +10 hrs)

2 2

nevow.i18n bugfix and feature need review and commit
by Tommi Virtanen 26 Jul '05

26 Jul '05

Hi. The patches attached to these two bugs need a review and someone to commit -- I don't have access to my normal work environment right now. They do two things: - number formatting: _('localization with number %d and floats %f') % (42, 3.141) - support proper pluralization: ungettext('%d dog', '%d dogs', count) % count http://divmod.org/users/roundup.twistd/nevow/issue212 http://divmod.org/users/roundup.twistd/nevow/issue213

1 0

Nevow importing reactor?
by Phil Mayers 26 Jul '05

26 Jul '05

Is this bad? http://divmod.org/users/roundup.twistd/nevow/issue211 Twisted says: http://twistedmatrix.com/projects/core/documentation/howto/choosing-reactor… """IMPORTANT: installing a reactor should be the first thing done in the app, since any code that does from twisted.internet import reactor will automatically install the default reactor if the code hasen't already installed one.""" It doesn't explicitly state the converse, that the framework should not cause a reactor to be installed, but I've seen plenty of code that "defers" importing twisted.internet.reactor. If it's not a bug then ignore, but if it's a trivial fix then...?

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Twisted-web July 2005