Mailman 3 August 2004 - Twisted

[Twisted-Python] Re: zpkg usage in Twisted
by Christopher Armstrong 18 Aug '04

18 Aug '04

On Tue, 17 Aug 2004 13:59:24 +0100, Michael Hudson <mwh(a)python.net> wrote: > Christopher Armstrong <radeex(a)gmail.com> writes: > > On Mon, 16 Aug 2004 22:50:35 -0400, Fred L. Drake, Jr. <fdrake(a)acm.org> wrote: > >> I'll be glad to answer questions and generally try to improve the > >> documentation to make zpkg easier to learn and use. > > > > And here my cue to start asking questions. :-) > > Uhh, I may be being daft, but I'm not sure Fred's gonna see > it.. AFAICT it only went to the twisted list. > From: Christopher Armstrong <radeex(a)gmail.com> > Reply-To: radix(a)twistedmatrix.com > To: Fred Drake <fred(a)zope.com> > Cc: Twisted general discussion <twisted-python(a)twistedmatrix.com> > Date: Mon, 16 Aug 2004 23:43:08 -0400 > Subject: zpkg usage in Twisted (was: including plugins.tml in a package?) That's what my headers say, anyway. -- Twisted | Christopher Armstrong: International Man of Twistery Radix | Release Manager, Twisted Project ---------+ http://radix.twistedmatrix.com

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[Twisted-Python] twisted.manhole
by twisted-10152003＠atlas.lcs.mit.edu 18 Aug '04

18 Aug '04

There doesn't seem to be much documentation for twisted.manhole. Yes, I have seen http://www.twistedmatrix.com/documents/current/howto/telnet So, I have been playing around with it trying to figure out the proper usage. I have some of it figured out. The following snippet works fine for my needs... from twisted.manhole.telnet import ShellFactory [...] shell = ShellFactory() shell.setService(s) // s here is my own service shell.password = "test" internet.TCPServer(config['telnet_port'],shell).setServiceParent(serviceCollection) But I was curious so starting looking at the other parts of it as well. Frustratingly, I haven't yet figured out how to employ twisted.manhole.ui twisted.manhole.service or twisted.manhole.explorer. Can anyone point so some examples or provide a brief overview. If get enough information I will pull it all together into a howto. Thanks, Steve Bauer

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[Twisted-Python] Nevow question
by Heiko Wundram 17 Aug '04

17 Aug '04

Hi all! I'm currently working on a web-application with twisted and nevow, and I'm using the SessionWrapper of nevow to enable logins. Well, here comes the catch: When a login fails, nevow redirects to the original page, with a parameter "login-failed=<somestring>", and I'd like to catch this parameter (rather, check if it is there, if it is, output a different string from the template). For this I have created two sections in the HTML template, both using nevow:render="<somefunction>", and for one of these, I return "", and for the other just context. But, the problem remains: how can I get the POST/GET parameters (without using something like Formless) that were posted to the page that is being displayed? Heiko.

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[Twisted-Python] Supporting new types with PB
by David Bolen 17 Aug '04

17 Aug '04

I've been trying to get Perspective Broker to cooperate for the transmission of mx.DateTime values across a remote session (we use them for some of our components which are referenceable objects) and was hoping to solicit input on the simplest or most appropriate way to handle things. A while back we encountered a similar problem with mx.DateTime values within objects that we were returning from components as copyables. Back then we "punted" and ended up supporting the concept of pickling specific fields for the remote copy, thus letting the mx.DateTime values go through as pickles. But I was hoping to support them more fully now. Originally I was hoping that I could just define mx.DateTime as an acceptable (type, class, module) in the default security object, but the problem seems to be that it needs support in the raw jelly layer, since it's a type in an extension module. I'm guessing that the same problem would exist with Python's (2.3+) datetime type, since that is also a new type and not a user class. So I next figured I'd just augment the jelly layer to add the new type, but that doesn't look all that clean to do. I really only want to change jelly, but the default broker uses the jelly module functions directly. I suppose I could reach in and change the jelly reference in the broker module but that seems messy. The one replaceable point appears to be the broker used by the PB factory. Presumably I could subclass the default broker with one that overrode the appropriate stuff to use my replacement jelly and in that replacement jelly handle the extra types prior to deferring to the default implementation. At least the client is quickly replaceable. For the server I'd subclass PBServerFactory to override the direct reference to Broker in buildProtocol, but would otherwise have to cut 'n paste the existing function to maintain behavior, which seems a little fragile. I suppose a separate alternative would be to wrap mx.DateTime in my own classes that implemented Jellyable/Unjellyable, but then I've got the overhead of running around with my own DateTime wrappers for no other reason than remote transmission. Of course, a final alternative is close to what we did previously for the Copyable problem, and just augment our wrappers on either end to transform mx.DateTime values into something jelly can handle across the relevant method calls. Am I missing something simple? Is there an intended method by which the existing jelly support in Twisted can be augmented to support other built-in types rather than only new classes? Thanks. -- David

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[Twisted-Python] reactor.stop
by Tsai Li Ming 17 Aug '04

17 Aug '04

Dear all, I understand we are not supposed to call reactor.stop() within twistd as the reactor is already running, therefore it will shut down the entire application. Why does calling reactor.stop within my module will cause the application to shutdown? Is it because even when I import the reactor in my own module, it is still somewhat linked to the twistd reactor through the system event trigger? Regards, Liming

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[Twisted-Python] adbapi.ConnectionPool
by Tsai Li Ming 16 Aug '04

16 Aug '04

Is the connection pool global within reactor/twistd? In another words, if I import adbapi in various of my py files and uses it, will I be using a single global connection pool throughout my modules? Liming

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Re: [Twisted-Python] lightweight persistence for twisted
by Sergio Trejo 16 Aug '04

16 Aug '04

Why not use divmod's atop. Just parse your flat files into simple objects that are persisted via atop's Store and PowerUps into a Sleepycat object database (assign each object containing your flat file a GID that is Indexed)? Serg >From: James Y Knight <foom(a)fuhm.net> >Reply-To: Twisted general discussion <twisted-python(a)twistedmatrix.com> >To: Twisted general discussion <twisted-python(a)twistedmatrix.com> >Subject: Re: [Twisted-Python] lightweight persistence for twisted >Date: Thu, 12 Aug 2004 13:14:22 -0400 > >On Aug 12, 2004, at 10:51 AM, Eugene Coetzee wrote: >>5) Would be nice if it could be accesses through Twisted's generic >>enterprise SQL API > >Last I looked, twisted's reflector stuff needed a lot of work. I'd thus >recommend against xmlreflector. > >If you want SQL, you probably want SQLite. It is a C module, so it does >introduce a dependancy, but it is otherwise fully self-contained. If you >don't want SQL, you can get a lot simpler. With 5000 records, you can >probably just store them all in a python datastructure in memory and either >serialize it or write it to something like a ":" separated file. > >James > > >_______________________________________________ >Twisted-Python mailing list >Twisted-Python(a)twistedmatrix.com >http://twistedmatrix.com/cgi-bin/mailman/listinfo/twisted-python _________________________________________________________________ Add photos to your e-mail with MSN 8. Get 2 months FREE*. http://join.msn.com/?page=features/featuredemail

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Re: [Twisted-Python] Understanding the role of .tap files
by Sergio Trejo 15 Aug '04

15 Aug '04

Did someone mention recently on #twisted.web (or maybe a related IRC channel such as #divmod ) that .tac files are going to be deprecated in the next major rev of Twisted, or maybe I misunderstood (I thought I read this a few days ago an IRC conversation but can't recall). Serg >From: Itamar Shtull-Trauring <itamar(a)itamarst.org> >Reply-To: Twisted general discussion <twisted-python(a)twistedmatrix.com> >To: Twisted general discussion <twisted-python(a)twistedmatrix.com> >Subject: Re: [Twisted-Python] Understanding the role of .tap files >Date: Fri, 13 Aug 2004 10:33:44 -0400 > >On Thu, 2004-08-12 at 21:58, Abe Fettig wrote: > > > I'm looking for help understanding how .tap files are meant to be used > > in production. I know that a .tap, when generated, contains the > > configuration info for an application. And there are tools like tap2deb > > and tap2ntsvc that take the information in a .tap and convert it into an > > installable packages. > >tap2deb and friends also work on .tac files, which are Python files (see >the application howto for an example). .tac files allow you to give >users a Python file for config that they can edit. Or, your .tap or .tac >could load a config file in the format of your choice and use that to >configure your app, and then users could edit that. > > >_______________________________________________ >Twisted-Python mailing list >Twisted-Python(a)twistedmatrix.com >http://twistedmatrix.com/cgi-bin/mailman/listinfo/twisted-python _________________________________________________________________ Help STOP SPAM with the new MSN 8 and get 2 months FREE* http://join.msn.com/?page=features/junkmail

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[Twisted-Python] need explanation in tutorial
by litnimax 13 Aug '04

13 Aug '04

Hi all, sorry for silly question. I started learning twisted, and have a question. (from evolving finger part 2) class FingerSetterProtocol(basic.LineReceiver): def connectionMade(self): self.lines = [] def lineReceived(self, line): self.lines.append(line) def connectionLost(self, reason): self.factory.setUser(*self.lines[:2]) # first line: user second line: status What is "*self.lines[:2]"? Why is there asterisk? If I remove * from parameters, I get functions take 2 arguments. From python I know that if parameter is coming with *, that means a tuple of parameters, if with ** - dict of parameters. >>> a {1: '22'} >>> a.__setitem__(*[1,'22222']) >>> a {1: '22222'} >>> *[1,'22'] File "<stdin>", line 1 *[1,'22'] ^ SyntaxError: invalid syntax How this code is working!!?? :)) How can *[1,'22'] work?? Thanks much in advance :) -- Using Opera's revolutionary e-mail client: http://www.opera.com/m2/

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[Twisted-Python] Understanding the role of .tap files
by Abe Fettig 13 Aug '04

13 Aug '04

Hi folks, I'm looking for help understanding how .tap files are meant to be used in production. I know that a .tap, when generated, contains the configuration info for an application. And there are tools like tap2deb and tap2ntsvc that take the information in a .tap and convert it into an installable packages. But then what happens when the user who installs the package wants to change some aspect of the configuration? Typically on UNIX they would edit a config file, but if I understand correctly using a config file for twisted apps is discouraged. Could someone describe how this process is supposed to work: 1. User installs package built from tap file. 2. User runs application 3. User changes application config 4. User restarts application Thanks! Abe

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