Mailman 3 November 2002 - Twisted

[Twisted-Python] twisted, nc and LineReceiver
by Alexandre Fayolle 07 Nov '02

07 Nov '02

Hello, it's me again ;o) So there's this server I'm porting from a ForkingTCPServer to twisted. It listens on a socket, and reads one line at a time, processes the line and writes the answer back on the socket to the client. The ForkingTCPServer version uses a handler deriving from StreamRequestHandler, and gets the data with self.rfile.readline(). The twisted version uses a LineReceiver protocol. Now, if I use telnet to connect to both version of the server, I can type some data, press return and get the answer back. This is great. However, if I use nc send the data, the twisted-based server sees nothing (lineReceived is not called!) I have to admit I'm baffled, and I'll take any idea. -- Alexandre

3 4

[Twisted-Python] grokking cacheable, take 2
by carball＠hush.com 07 Nov '02

07 Nov '02

ok, the insecurejelly error i was getting i found was actually due to trying to store the observer(s) in the Cacheable object itself. . evidently jelly doesnt take too kindly to having these objects in there when it serializes the Cacheable. . i was able to get around this by storing the observer in the perspective that is passed as the first argument to getStateToCacheAndObserveFor the docs say storing the observer(s) in the Cacheable is the preferred method no? "It is recommended that your object maintain a list (note: library support for this is forthcoming!) of observers, and update them using callRemote when the Cacheable changes in a way that should be noticeable to its clients." so, my new question is: what IS the preferred way to store observers? ------------------------- i have a feeling the answer was in the first round of responses i got ( greatly appreciated, thank you ), but i still do not entirely understand what the best method would be. . again, thanks for the advice AND the KILLER framework. . :D car Get your free encrypted email at https://www.hushmail.com

2 1

[Twisted-Python] newbie comments on documentation
by Alexandre Fayolle 07 Nov '02

07 Nov '02

Hi there, I'm starting with twisted (debian package 0.99.2-4), and I'm currently trying to convert a SimpleTCPServer based project to twisted, and therefore reading the documentation and trying to wrap my head around the framework. Here's a few comments. I'm a good (python) programmer, but a complete twisted newbie, and I think I may not be the only one with the same problems/doubts/questions on the documentation. The file quoters.py uses twisted.python.components.Interface, though the text in the Plugin HOWTO says that "Note that this module does not import any Twisted functionality at all!". It is not clear if the Interface declaration is needed or not from reading the code and the HOWTO. The file quoteproto.py imports twisted.internet.app.Application, which is never used. The import line should be removed from the example file. That's all for now. -- Alexandre

2 1

Re: [Twisted-Python] Question regarding widgets
by lals;dfjsd 06 Nov '02

06 Nov '02

---------- Original Message ---------------------------------- From: Andrew Bennetts <andrew-twisted(a)puzzling.org> Reply-To: twisted-python(a)twistedmatrix.com Date: Wed, 6 Nov 2002 12:12:12 +1100 >On Wed, Nov 06, 2002 at 09:00:13AM +0800, lals;dfjsd wrote: >> > >> >IIRC. However, I don't understand what you're trying to do here. If you have >> >Twisted installed in your C:\python22\lib\site-packages (as with setup.py or >> >the .exe installer) then you shouldn't be adding anything to your PYTHONPATH to >> >get 'twisted' to import. >> >> Well following the example for woven, I thought that you needed to add >> to pythonpath where ever you are putting your code for your >> application, as in if I want to put my code in c:\web2\mohan_koteh\ >> then i should add this to the pythonpath to get it to work. Isn't it >> so ? I just kept on trying the woven examples but without success >> until i added the directory which i was working on to the pythonpath. >> Maybe I am doing something wrong here but can someone actually tell me >> how it is done ? > >He's just pointing out that you shouldn't need to do anything special to >get Twisted itself to import -- the installer/setup.py should've done >that for you (anything in %PYTHONHOME%/Lib/site-packages is >automatically on the python path). > >What you need to do with your own application that uses Twisted is a >different question. > >-Andrew. Ummm so does that mean I have to add something to the pythonpath for a web application that I am building in a particular directory ? > > >_______________________________________________ >Twisted-Python mailing list >Twisted-Python(a)twistedmatrix.com >http://twistedmatrix.com/cgi-bin/mailman/listinfo/twisted-python > _____________________________________________________________________ iRepublics.com - Free Web Hosting for Businesses 33MB webspace free, SMS messaging, 30 email accounts, your own domain name Sign up Now at http://www.iRepublics.com

5 6

[Twisted-Python] How to implement progress/transfer speed/transfered bytes handlers?
by Michael Scharf 06 Nov '02

06 Nov '02

Hi, I want to use twisted as nntp client. Is it possible to add somewhere into the streams something like a progress bar or something that reports the download speed or the total transferred bytes? I have not looked too deeply into twisted, but as I understand it it uses the Decorator pattern between the connection and the actual handler. All I would need is to add a little class somewhere in between each connection and the handler, so that I can decorate the Protocol.dataReceived events... Michael -- +++ GMX - Mail, Messaging & more http://www.gmx.net +++ NEU: Mit GMX ins Internet. Rund um die Uhr für 1 ct/ Min. surfen!

1 0

Re: [Twisted-Python] Question regarding widgets
by lals;dfjsd 06 Nov '02

06 Nov '02

---------- Original Message ---------------------------------- From: Glyph Lefkowitz <glyph(a)twistedmatrix.com> Reply-To: twisted-python(a)twistedmatrix.com Date: Tue, 05 Nov 2002 03:41:19 -0600 (CST) >On Tue, 5 Nov 2002 15:54:46 +0800, "lals;dfjsd" <twisted_low(a)contact.com.my> wrote: > >> I am newbie with some background using zope. I am trying to use twisted in a >> web application that is going to be launched in my office. Problem now is >> that i cannot get the example to work ( Example ) ..... > >Can you expound a little more on which example you're talking about? "the >example [...] (Example)" is not very specific in a framework as large as >Twisted. > >> Specs : > >> 1. os --> windows 98 >> 2. python --> python-2.2.2 > >It should work, though I would recommend upgrading to a more sane version of >Windows whenever you've got the chance :-) > >> This is my autoexec.bat : > >> @SET PYTHONPATH=C:\python22\lib\site-packages\twisted\ >> @SET PYTHONPATH=C:\web2\TWISTEDQUOTES\;C:\WEB2\MOHAN_KOTEH\ > >@echo %PYTHONPATH% > >will probably show you that your PYTHONPATH is >"C:\web2\TWISTEDQUOTES\;C:\WEB2\MOHAN_KOTEH"; if you want to add things to the >path rather than reset it entirely, you want it to look like: > > @SET PYTHONPATH=C:\python22\lib\site-packages\twisted\ > @SET PYTHONPATH=%PYTHONPATH%;C:\web2\TWISTEDQUOTES\;C:\WEB2\MOHAN_KOTEH\ > >IIRC. However, I don't understand what you're trying to do here. If you have >Twisted installed in your C:\python22\lib\site-packages (as with setup.py or >the .exe installer) then you shouldn't be adding anything to your PYTHONPATH to >get 'twisted' to import. Well following the example for woven, I thought that you needed to add to pythonpath where ever you are putting your code for your application, as in if I want to put my code in c:\web2\mohan_koteh\ then i should add this to the pythonpath to get it to work. Isn't it so ? I just kept on trying the woven examples but without success until i added the directory which i was working on to the pythonpath. Maybe I am doing something wrong here but can someone actually tell me how it is done ? > >> i can't seem to get the Example even to compile and looking through the docs >> doesn't seem to help much. One question can i use the --personal option on a >> windows machine ? > >No. Windows doesn't have the notion of unix sockets. Even if you could, there >wouldn't be much of a point: windows security (especially on 9x!) is even more >of a disaster than UNIX, so separating privileges between processes doesn't >help much of anything if you're running them on the same machine. > >Why do you think you want the --personal option? It's designed for multi-user >servers where you've got lots of different people running webservers and you >want them all to be accessible through port 80. > >> I get an error that says it cannot find the pwd module. Can someone please >> help me or at least point me somewhere where there are some docs ??? > >The pwd module is for determining your UNIX username and home directory (which, >surprise, you don't have ^_^). The --personal option is pretty much useless to >you. > >-- > | <`'> | Glyph Lefkowitz: Traveling Sorcerer | > | < _/ > | Lead Developer, the Twisted project | > | < ___/ > | http://www.twistedmatrix.com | > > _____________________________________________________________________ iRepublics.com - Free Web Hosting for Businesses 33MB webspace free, SMS messaging, 30 email accounts, your own domain name Sign up Now at http://www.iRepublics.com

2 1

Re: [Twisted-Python] question
by lals;dfjsd 06 Nov '02

06 Nov '02

---------- Original Message ---------------------------------- From: Glyph Lefkowitz <glyph(a)twistedmatrix.com> Reply-To: twisted-python(a)twistedmatrix.com Date: Tue, 05 Nov 2002 03:20:40 -0600 (CST) >On Tue, 5 Nov 2002 16:54:43 +0800, "lals;dfjsd" <twisted_low(a)contact.com.my> wrote: > >> in the book to get the example for widget working it says that we have to do >> a twistd -g Example and that this Example should be placed in a >> ~/TwistedPlugins directory. This is not clear at all on a windows based >> machine. Where the heck is this TwistedPlugins directory supposed to exist ? >> .... > >That documentation is ancient and probably incorrect by now... apologies for >the UNIX centricity. The old-style directory-based plugins were an experiment >which failed. Nowadays "plugin" means something a little more pythonic (see >http://www.twistedmatrix.com/documents/howto/plugin ). > >At any rate, twisted.web.widgets is quite out of date, gradually being >deprecated, and not nearly as good an idea as we originally thought. If you >want to do Twisted + web applications, you want to use twisted.web.woven. Okay if this is the case, can you let me know how macros is done using woven ? I come from a background of using zope and '<span tal:define-macros' ... I really need to know how to do macros in twisted. I have tried digging through the mailing list and asking in the channel but couldn't get a straight answer. Hopefully I can get an answer ... Thanks in advance. _____________________________________________________________________ iRepublics.com - Free Web Hosting for Businesses 33MB webspace free, SMS messaging, 30 email accounts, your own domain name Sign up Now at http://www.iRepublics.com

1 0

[Twisted-Python] question
by lals;dfjsd 05 Nov '02

05 Nov '02

in the book to get the example for widget working it says that we have to do a twistd -g Example and that this Example should be placed in a ~/TwistedPlugins directory. This is not clear at all on a windows based machine. Where the heck is this TwistedPlugins directory supposed to exist ? .... in c:\python22\scripts ??? Where ???? _____________________________________________________________________ iRepublics.com - Free Web Hosting for Businesses 33MB webspace free, SMS messaging, 30 email accounts, your own domain name Sign up Now at http://www.iRepublics.com

3 2

[Twisted-Python] authwovenquotes.rpy
by Thomas Raschbacher 05 Nov '02

05 Nov '02

Hi! some time ago i re-wrote wovenquotes.rpy to support auth too ... i promised radix to write docs and submit them(sorry but i had no time yet) so i just submit the file now suggestions,comments(,flames)? greetings, LordVan P.S.: i'll write the doc asap -- -----BEGIN GEEK CODE BLOCK----- GCS/CC/E/M/MU/S d- s: a--- C++++(++) UL++++ P+ L++++ E W+++ N+++ o-- K w-- O M-- V- PS+ PE-- Y++ PGP+++ t+++ 5+ X- R tv b++++ DI- D+ G++ e-->+++++ h-- !r z- ------END GEEK CODE BLOCK------ ----------------------------------------- This email was sent using SquirrelMail. "Webmail for nuts!" http://squirrelmail.org/

1 0

[Twisted-Python] patch for twisted.enterprise.row
by Thomas Raschbacher 05 Nov '02

05 Nov '02

hi! Patch for twisted.enterprise.row to allow a whereClause specified as String too and to allow ORDER BY clause(will be checked if it's a valid column). while doing this i found out that in twisted.enterprise.row the variable(String) 'type' is used. 'type' is a built-in function of Python and i don't think the author wanted to overwrite it so i changed it to Type. all changes have been made on cvs version and are verified to work Any comments,suggestions, ... greetings LordVan -- -----BEGIN GEEK CODE BLOCK----- GCS/CC/E/M/MU/S d- s: a--- C++++(++) UL++++ P+ L++++ E W+++ N+++ o-- K w-- O M-- V- PS+ PE-- Y++ PGP+++ t+++ 5+ X- R tv b++++ DI- D+ G++ e-->+++++ h-- !r z- ------END GEEK CODE BLOCK------ ----------------------------------------- This email was sent using SquirrelMail. "Webmail for nuts!" http://squirrelmail.org/

1 0