Mailman 3 September 2003 - Twisted

[Twisted-Python] 1.0.7 Windows installer bug?
by Matt Boersma Sept. 24, 2003

Sept. 24, 2003

Hello twisters: I've been developing a PB application on Debian Linux, and it has gone quite well. But a coworker wants to test things on Windows. <sigh> I've done nothing intentionally platform-specific, so I don't think there will be any problems here. I went to install the 1.0.7 binary release on my Win2K test box to verify this, but after nearly completing the install, it errors out with: Unable to execute file: ACK\pythonw.exe CreateProcess failed; code 2. The system cannot find the file specified Where is it getting "ACK" from? I have a standard binary install of python2.3 from www.python.org on Win2K SP3, and PYTHONHOME is set to "C:\Python2.3". Any clues would be much appreciated. Matt

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[Twisted-Python] 1.0.7 Windows installer bug? Solved.
by Matt Boersma Sept. 24, 2003

Sept. 24, 2003

Thanks Cory. I believe I've found the issue, and I filed it with the issue tracker. In the Windows python 2.3 installer, you can choose either an "admin" or "non-admin" install, the stated difference being that the core python DLLs go either in %WINDIR%\System32 or in the %PYTHONHOME% directory. (I don't know if this is a new option in Python 2.3--we jumped straight from 2.1 to 2.3.) Another difference is apparently that the Python registry keys go into the HKEY_CURRENT_USER hive instead of the HKLM one. Creating the (Default) REG_SZ key for InstallPath in the HKLM hive works around the problem. Matt

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[Twisted-Python] Twisted scalability question
by Matti Jagula Sept. 23, 2003

Sept. 23, 2003

Hi, I've got a task to write a DHCP server for a local cable operator and I'm considering different frameworks to write it in. I've looked at Twisted a couple of times and thought I'd do some little experimenting to see how well it behaves with the current task at hand. The DHCP server needs to do some database interaction to support the business logic. So to model the problem I wrote two simple QOTD servers for UDP protocol, using a postresql backend for quotes. One server is written using a Twisted DatagramProtocol and uses Deferreds for database query using adbapi. The other is a dead-simple single-threaded block-and-wait UDP socket server with a single database connection that just reads from the udp socket, queries the database and writes the result back. So far so good. I wanted to see how well these servers scale with a lot of requests. First I tried making just a lot of sequential requests from a single-threaded client, but that showed that the Twisted version was slower by a factor of ~4. After a little consideration I thought that Twisted must be better for a lot of concurrent requests, because of the threaded database access. Twisted should be able to accept more than one client at a time and keep all the database connections (5 by default, i guess) busy. So I forked 20 clients off using a simple bash script with a for loop. The result was that the Twisted is still slower, by the same factor of 4. The "top" shows that while the Twisted server is running, the 5 postgresql connections are mostly in "idle" state (they change the name of the process to show it). However, while the single threaded server is running, the only active pgsql connection is mostly in its "select" state. So, after the rather lengthy introduction, I'd like to know what am I doing wrong? How can I show the better scalability of Twisted platform? -- Matti Jagula

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[Twisted-Python] how to generate another html page?
by suneetha＠sonic.net Sept. 22, 2003

Sept. 22, 2003

Hi, When I click on an image, I would like to generate a web form on the fly, in a desired location. I tried with both Page and DOMTemplate classes. Could anyone please give me an idea on what attributes to be defined for what html tags and what class a resource file should use? I think I misunderstand something in between here. I know how to generate the web form, only problem is how to integrate this with twisted, woven. Thanks Suneetha.

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[Twisted-Python] Getting to 1.1 -- calling all CVS committers
by Itamar Shtull-Trauring Sept. 22, 2003

Sept. 22, 2003

Thanks to Moshe, twisted.application has landed. In order to reach 1.1, there's a few things we need to do: 1. Better new cred docs. 2. Update PB docs to talk about new cred. 3. Update application docs. 4. Update all examples and listings to use PB new cred and new app. 5. Update all taps to use new app. 6. Update manhole, words, distrib etc. to use new cred. By 1.1, we should have no mention or usage of the old APIs in our docs, examples and code. This is going to take some work, so please pitch in and help. If you don't have CVS, patches to any of the above are welcome! -- Itamar Shtull-Trauring http://itamarst.org/ Available for Python & Twisted consulting

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[Twisted-Python] Examples using PBServerFactory ?
by Baptiste Lepilleur Sept. 22, 2003

Sept. 22, 2003

Is there some examples of using the PBServerFactory ? When running examples from Perspective Broker how to (http://twistedmatrix.com/documents/howto/pb-usage#auto2) I get a deprecated warning concerning pb.BrokerFactory usage. Since I'm new to twisted, I'd rather get thing right from the start Thanks, Baptiste.

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[Twisted-Python] send somes mails
by William Dode Sept. 21, 2003

Sept. 21, 2003

Hi, Is it a good way to call smtp.sendmail() for sending a lot of mails (it's for a scrabble game, not spam !) It will connect and deconect for each mail isn't it ? thanks -- William Dodé - http://flibuste.net

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[Twisted-Python] formatting a CopiedFailure for GUI display
by Eric Mangold Sept. 21, 2003

Sept. 21, 2003

Hi folks, When dealing with normal Failure instances, a simple str(aFailure.value) will produce an acceptably short error message. However, a CopiedFailure's value attr is "". str(aCopiedFailure) is the whole giant traceback, unsuitable for a gui message box. Are there any alternatives? -Eric

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Re: [Twisted-Python] UDP Factories
by Justin Johnson Sept. 21, 2003

Sept. 21, 2003

Thanks for the help. This makes sense to me now. -Justin On Fri, 19 Sep 2003 22:21:21 -0400, "Itamar Shtull-Trauring" <itamar(a)itamarst.org> said: > On Fri, 19 Sep 2003 16:18:32 -0600 > "Justin Johnson" <justinjohnson(a)fastmail.fm> wrote: > > > Yeah I sent this email out real quick without looking at the doc. > > Sorry. > > > > I'm using UDP because the device I'm coding for uses UDP. Twisted > > sure saved me a ton of time. > > > > Out of curiosity, why doesn't listenUDP accept Factories? > > This would, to be a general purpose thing, need to create a protocol per > datagram. This would be... inefficient. In TCP you have a protocol per > connection. In UDP there are no connections. You might build one on top > of UDP, in which case you would have a protocol-ish object you dispatch > to, but how you determine this object and its lifecycle would be > something you would have to determine. > > -- > Itamar Shtull-Trauring http://itamarst.org/ > Available for Python & Twisted consulting > > _______________________________________________ > Twisted-Python mailing list > Twisted-Python(a)twistedmatrix.com > http://twistedmatrix.com/cgi-bin/mailman/listinfo/twisted-python

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Re: [Twisted-Python] UDP Factories
by Kevin Rosenjack Sept. 21, 2003

Sept. 21, 2003

Your not coding for a UPnP device by any chance, are you? >From: "Justin Johnson" <justinjohnson(a)fastmail.fm> >Reply-To: twisted-python(a)twistedmatrix.com >To: "Twisted-Python" <twisted-python(a)twistedmatrix.com> >Subject: Re: [Twisted-Python] UDP Factories >Date: Fri, 19 Sep 2003 16:18:32 -0600 > >Yeah I sent this email out real quick without looking at the doc. Sorry. > >I'm using UDP because the device I'm coding for uses UDP. Twisted sure >saved me a ton of time. > >Out of curiosity, why doesn't listenUDP accept Factories? > >On Fri, 19 Sep 2003 11:03:20 -0400, "Itamar Shtull-Trauring" ><itamar(a)itamarst.org> said: > > On Fri, 19 Sep 2003 05:42:08 -0600 > > "Justin Johnson" <justinjohnson(a)fastmail.fm> wrote: > > > > > I have a UDP protocol that subclasses DatagramProtocol. It is working > > > fine, but I decided I wanted a protocol factory so I can keep track of > > > the list of clients. I added the following class, which doesn't > > > nothing currently... > > > > You will notice the docs say nothing about factories. This is because > > listenUDP does not accept factories :) If you want to keep track of > > clients you will have to do it yourself by dispatching based on the > > host/port of a received datagram. > > > > Why are you using UDP, by the way? > > > > -- > > Itamar Shtull-Trauring http://itamarst.org/ > > Available for Python & Twisted consulting > > > > _______________________________________________ > > Twisted-Python mailing list > > Twisted-Python(a)twistedmatrix.com > > http://twistedmatrix.com/cgi-bin/mailman/listinfo/twisted-python > >_______________________________________________ >Twisted-Python mailing list >Twisted-Python(a)twistedmatrix.com >http://twistedmatrix.com/cgi-bin/mailman/listinfo/twisted-python _________________________________________________________________ Get 10MB of e-mail storage! Sign up for Hotmail Extra Storage. http://join.msn.com/?PAGE=features/es

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