Mailman 3 May 2002 - Twisted

[Twisted-Python] Twisted Python 0.7.0 Prerelease Testing
by Glyph Lefkowitz 06 Aug '21

06 Aug '21

hi there, folks: I'd really like to release 0.7.0 but I would like it to be at least a little bit tested before I do so. Could those of you with CVS trees check everything out and see if it performs as advertised? Deeper bugs than that will have to wait for the next release, but I'd at least like to know if it works for someone other than me. Thanks. ______ __ __ _____ _ _ | ____ | \_/ |_____] |_____| |_____| |_____ | | | | @ t w i s t e d m a t r i x . c o m http://www.twistedmatrix.com/~glyph/

4 5

[Twisted-Python] [patch] mktap web --resource
by Sune Kirkeby 12 Aug '02

12 Aug '02

Hi, all! Attached is a short patch to add a --resource option to "mktap web", here is the --help for it: -r, --resource= <class> is the name (including module) of a subclass of twisted.web.resource.Resource to publish. So you can have any subclass of t.w.r.Resource be the 'root' of your web-server. I have also been working on a few other things: - an async Pytho-only PostgreSQL interface (not t.e.adbapi compatible, since I am not usre I like it's interface and need to play a bit before I figure out how I would like an async SQL-database interface to behave.) - a SQLResultWidget, very dull right now but I will probably hack some BoboDTML support into it. first-post-but-not-like-/.-ly yrs, -- Sune Kirkeby | /* we're still looking for the end of the | * server's header ... (does that make header | * parsing an "out of body experience" ? */ | -- jcc.c in junkex source-code

8 13

[Twisted-Python] Arms Crisis
by Glyph Lefkowitz 10 Jun '02

10 Jun '02

Anyone who has programmed in depth with Twisted probably know about arm()ing deferreds by now. Nobody has complained as loudly as I thought they would, so I'm not sure if this is really that big of a problem, but I'm questioning my original design decisions regarding .arm(). Originally, I wanted it to be easily determineable whether your callback would be called before your stack had been escaped; so the system you returned your Deferred to would .arm() it afterwards. However, this creates lots of weird, confusing corners for callbacks to get lost in, and I have yet to see a situation where it actually matters whether your current stack frame is escaped before the callback happens. I would like to propose that we create an experimental mode where .arm() be made to do nothing (for backwards compatibility), and that .callback() call whatever callbacks are available immediately; and .addCallbacks() (and friends) will immediately call any pending callbacks. If after an extended period of testing it is discovered that there are no bugs created with this approach, we should remove .arm() entirely. I'd like some feedback on this, though. Does anyone else think that callbacks sometimes happening and sometimes not when .addCallbacks() is called makes a difference? Anyone feel strongly that .arm() is confusing and unnecessary? -- | <`'> | Glyph Lefkowitz: Travelling Sorcerer | | < _/ > | Lead Developer, the Twisted project | | < ___/ > | http://www.twistedmatrix.com |

4 3

[Twisted-Python] Proposal: Make tax default, tap optional
by Itamar Shtull-Trauring 01 Jun '02

01 Jun '02

XML pickles have many benefits over taps, and the only issues they have is not support 1.5 and 2.2 new-style classes. I suggest we make them the default - a tap file is *much* less useful than a tax.

5 5

[Twisted-Python] Regarding customer support...
by Jason Asbahr 01 Jun '02

01 Jun '02

Given some of the chats I've had with Glyph regarding bug tracking, customer support, and project management in Twisted, here's a nice overview article that provides some concrete definitions and feature descriptions for each. Note the "Workflow Management" paragraph where the author claims that the above mentioned systems are instances of Workflow Management and a system built around workflow management abstractions could be 'trivially' used to develop the others. http://linas.org/linux/pm.html Looking at the numerous examples of partial implementations of these various systems out there, it seems that it is easy to start one of these projects, but hard to get it to the point where it is actually useful (and I'm specifically looking at project management here). Apparently there was a project manager called Xen for Zope, but it seems dead now. But here are two interesting bits of code that could be incorporated into a Twisted-based project manager -- PyGantt, which take an XML-formatted project description and generates an HTML Gantt chart; and an O'Reilly article that describes something similar with Piddle. http://www.logilab.org/pygantt/ http://www.onlamp.com/pub/a/python/2001/05/31/piddle.html PyGantt is neat because it could be modified to generate hyperlinked project task titles that would go to a task description dialog (or page). Dates could also be hyperlinked for editing. The XML part could be factored out into import/export, and the project description could be instead accessed from project-tree and task-node instances in Twisted. Having a way to represent "user stories" and "use cases" as task nodes would be cool. Then Roark could (ahem, when I get time to help Matt work on it) be used to create and edit use cases and other modeling entities and the task manager could be used to schedule and track progress on them. Cheers, Jason

2 1

[Twisted-Python] Using HTTP proxies to circumvnet firewalls
by Itamar Shtull-Trauring 01 Jun '02

01 Jun '02

Apparently, HTTP proxies have a command CONNECT, that lets you open a TCP/IP connection to an arbitrary host and port. This is intended for HTTPS. Now, most proxies probably limit this to 443 only, HTTPS port. So, presumably all those clients like ICQ that let you run over HTTP proxy - they use this, and have a ICQ server running on port 443. Thus allowing people to use it behind corporate firewalls. So, we need a HTTPProxy transport that will do this automatically for clients, along with a SOCKSv4 transport and eventually a SOCKSv5 transport. proxy = HTTPProxier("proxy.isp.net", 8080) proxy.clientTCP("www.example.com", 443, myProtocolInstance) # cool, huh?

1 0

[Twisted-Python] [patch] three short ones
by Sune Kirkeby 31 May '02

31 May '02

Hello twisted-ppl, Attached you'll find three short patches, two against t.w.widgets.RenderSession and one against t.p.http.Request. The first patch makes RenderSession unicode-agnostic (i.e. makes it treat string and unicode object alike). The second one makes t.p.http.Request aware of unicode, to the extent that it will correctly handle unicode strings with all ordinals < 128 (by simply str'ing them). The last patch makes RenderSession.callback return the result it was passed, so that later callbacks made by the given Deferred also benefit from this knowledge. It had completely escaped me that Deferred._runCallbacks acts like a folding operation, last I poked around in the code. Regards, -- Sune Kirkeby | % cat /usr/include/sys/errno.h | #define EPERM 1 /* Operation not permitted */ | [...] | #define EMACS 666 /* Editor Too Large */

1 0

[Twisted-Python] Zope PageTemplates for Twisted
by Sune Kirkeby 31 May '02

31 May '02

Whee! In a fit of God-how-I-hate-all-other-template-languages I decided to take another look at Zopes PageTemplates (TAL, METAL and friends). I ended up liking the beast so much I decided to start porting it to Twisted, which resulted in the attached t.w.tal module. It is still very incomplete, and most likely also very buggy. But, in the interest of feedback I post it here. It dislikes it when I reuse deferreds (t.w.w.RenderSession becomes very confused and claims to be "rendering unknown" for all but the first instances). Other than that the only problem I have had so far was that I had to remove a str'ing in the TAL-engine. -- Sune Kirkeby | 5 out of 4 people have trouble with fractions.

1 0

[Twisted-Python] Issue with factories
by Itamar Shtull-Trauring 30 May '02

30 May '02

If you do reactor.listenTCP on a factory, startFactory and stopFactory are never called. I therefore suggest that we add methods doStart and doStop to protocol.Factory, like so, and have them called in listenTCP/UDP/SSL, and remove calls to start/stopFactory from app.Appliecation: class Factory: running = 0 def doStart(self): if not self.running: self.running = 1 self.startFactory() def doStop(self): if self.running: self.running = 0 self.stopFactory() This ensures the start/stopFactory methods will only be called once, even if the factory is added to multiple Ports, and makes sure that they get called even if the factory is added to the reactor directly.

3 3

[Twisted-Python] LDAP is dead, long live LDAP!
by Tommi Virtanen 30 May '02

30 May '02

LDAP support has been removed from the main Twisted tree. For the future, please refer to http://twistedmatrix.com/users/tv/ldaptor/ - the main application for now is a web-based editor/browser for an LDAP directory. -- tv(a){{hq.yok.utu,havoc,gaeshido}.fi,{debian,wanderer}.org,stonesoft.com} double a,b=4,c;main(){for(;++a<2e6;c-=(b=-b)/a++);printf("%f\n",c);}

2 2