Twisted Weekly News #11

Twisted Weekly News #11
Author: Lior Gradstein
Contact: lior@gradstein.info
Revision: 1.0
Date: 2004/2/17 14:13:20
Copyright: © The Twisted Community

Contents

The Twisted Weekly News
Discussions
Articles/Sites related to Twisted
Cool Things of the Week
New/Updated Cool Software
Current releases

So many announcements and new Twisted based software! This week’s TWN (especially because it is merged with previous week) is full of really cool news/articles/software that will keep you busy for at least two months.

If you have any new information, ideas, announcements for the next TWN, please write to me, . TWN is also available as HTML formated ReST on http://gradstein.info/articles/twisted_news/twn11
The Twisted Weekly News

11th Issue. Tuesday, February 17, 2004

QOTW:

Twisted: Just Because It’s Not Documented and Unstable Doesn’t Mean You Shouldn’t Use It

Discussions

David Bolen asked if there was a way to keep the references to the remote PB object when a disconnect happened, and reconnect all automatically. Jp Calderone replied that, in its current shape, it is not possible, because the references are reinitialized when the connection is re-enabled. But he said this would not be too hard to implement.
Stephen Waterbury posted a code example on how to interface twisted.cred with a database where the user/pass is stored. A few days later, Stephen posted another example, less trivial, showing web auth against a db.
Martin Stenhard asked how to get the remote ip address of a connecting client, if the connection is made using PB.
David A. Leedom asked for some advice on how he should design a remote backup architecture using Twisted. Michal Pasternak replied that he should pay a lot of attention on the size of transmitted data, as PB limits paramaters to 640KB max.

Articles/Sites related to Twisted

Nevow: A Web Application Construction Kit (http://soundfarmer.com/content/nevow.html) fzZzy wrote a proposal to give a talk on nevow at this year’s PyCon. It turns out to be a good overview of what nevow is about.
Planet Twisted A new website which is a blog of all the Twisted developers blogs.
Article about Twisted Networking Itamar wrote an introductory article about Twisted networking.
Understanding Network I/O, Part 2 Article by George Belotsky, on how to achieve network asynchronous I/O with examples of code in asyncore,twisted,threads, etc.

Cool Things of the Week

Rebirth of pyx/fzZzy blog fzZzy has renewed his blog, with information about nevow and the successor to LivePage named liveevil. A first (very) impressive example is a chat application, located on http://soundfarmer.com/content/code/chatola/ .
Nevow Wiki A survey is online showing who’s doing what with Nevow today. There are many really interesting projects going on!
Beyond2 (http://www.asbahr.com/beyond.html) Beyond 2 builds upon the Twisted server and extends it to enable arbitrary 3D clients to connect to a common simulation framework. Twisted provides object persistence, remote method invocation, database integration, and more. The project seems to restart/continue, with the help of Nafai and lstep. A Wiki has been set up on http://www.beyond2.org/
Twisted Forum (http://twisted.banquise.org/) Some new sections have been added to the forum (Snippets, PB)

New/Updated Cool Software

UpStage A complex chat application that allows streaming of video.
BEEP protocol The BEEPy Python BEEP Library is an implementation of the Blocks Extensible Exchange Protocol (RFC3080), written as a Python library. The difference with the previous version, is that it is now implemented with Twisted! (“It is now implemented using the Twisted framework for fast, asynchronous network communications”).
Shtoom Shtoom is a pure python implementation of a Voice over IP software phone.
Trash ‘Trash’ a pastebin application written using the Twisted framwork (using woven).
GoSiege A game on the Go game model, but in a online multiplayer (MMOG) mode. The code is really a very good example of well written code (at least from my point of view). I recommend it if you’re looking for PB example code.
Twibber Version 0.2.0pre1, twibber is a Python package aimed at handling the Jabber – XMMP protocol in a completely asynchronous way.
Crow’s Nest (http://crowsnest.sourceforge.net/) Crow’s Nest is a project designed to help collect log information from various sources and to apply some filter to them in a very modular way.
PETMail PETMail is a permission-based anti-spam replacement for SMTP, using recipient-defined CAPTCHA challenges for new senders, automatic (but revocable) permission-granting for most correspondents, encrypted and signed (but pseudonymous) messages, and provisions for easily changing addresses or transports (including a mechanism to publish remailer SURBs as a destination).
PEAK 0.5a2 (Not directly related to Twisted, but allows the developer to use the twisted reactor). The third alpha is available. That version includes a new framework (peak.events) that allows the developer to make his programs more event-driven (in the sense of subscribers/observers). The event loop, as usual, can be set to be Twisted’s reactor.