Mailman 3 August 2001 - Twisted

[Twisted-Python] [bug] web.resource.Resource.render.__doc__
by Kevin Turner Aug. 7, 2001

Aug. 7, 2001

My, that was annoying. Resource.render.__doc__ says: > Render a given resource. > > The return value of this method will be the rendered page, unless the > return value is None, in which case it is this class's responsability > to write the results to request.write(data), then call > request.finish(). however, the magic value is not 'None', but web.server.NOT_DONE_YET, a constant which is *NOT* defined as None. So, which'll it be, boys? Is the docstring wrong, or is the code?

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[Twisted-Python] Another Change to Factory.buildProtocol
by Moshe Zadka Aug. 7, 2001

Aug. 7, 2001

def buildProtocol(self, connection): """Create an instance of a subclass of Protocol. The returned instance will handle input on an incoming server connection, and an attribute "factory" pointing to the creating factory. Override this method to alter how Protocol instances get created. """ p = self.protocol() p.factory = self + p.connection = connection return p -- Moshe Zadka - http://moshez.geek (if you're not … [View More]

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[Twisted-Python] fwd: Re: [Python-Dev] Zope porting to jython
by Moshe Zadka Aug. 7, 2001

Aug. 7, 2001

Other then the interesting thread, note the description of the way Zope does "safe python". Glyph, should I start adding Depends: python-bytecodehacks? ;-) To: "Samuele Pedroni" <pedroni(a)inf.ethz.ch> From: Jeremy Hylton <jeremy(a)zope.com> Cc: <python-dev(a)python.org> Subject: Re: [Python-Dev] Zope porting to jython >>>>> "SP" == Samuele Pedroni <pedroni(a)inf.ethz.ch> writes: SP> my personal position is to help them as all other jython users, … [View More]

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[Twisted-Python] TWN #5!
by Chris Armstrong Aug. 6, 2001

Aug. 6, 2001

The Twisted Weekly News ======================= #5th Issue. Monday, August 6, 2001 QOTW: (since this TWN covers two weeks, here are two quotes for your enjoyment! hooray!) <Acapnotic> garble. if I don't find a twisted.spread example soon, I might try to figure out what .spread is supposed to do by looking at the source directly <Acapnotic> which would probably be unhealthy <dash> Acapnotic: hey! i've been reading the source for the past month! didididididn't … [View More]bother me at all! * dash giggles % <glyph> HELP ME SMALL CHILD I HAVE ATTEMPTED TO CREATE A WEB SERVER BUT I HAVE BECOME LOST (for those of you who don't get the pokey reference in the second one, see http://yellow5.com/pokey/archive.) Welcome to the 5th issue of the Twisted Weekly News! Sorry that this one's a week late - the editor actually had *real work* to do at work. This TWN is packed with info, Twisted has seen a sudden growth spurt in users and in code, and we're all very excited about that. Progress -------- OK, like I said, we have tons of stuff going on recently. Lots and lots of code changes, here they are: * Twisted 0.9.4: yes, another Twisted release[1] happened this week. This was a pretty full release, with bug fixes, new features, and general cleanup. twisted.spread.banana was ported to C, thus yielding a large increase in speed (optionally, of course!), PB was made incompatible with old versions when glyph added the option for passing a "reverse Perspective" to a server in requestPerspective, since this was such a commonly asked-about problem. Twisted.Words, the cool new IRC/IM killer was introduced, Twisted.Mail was re-integrated, and SPLs were renamed to TAPs. * Chris Armstrong wrote an initial "mkserver" utility that replaced all the mess of mk*server utilities that were a part of Twisted. This was later renamed to 'mktap', to reflect the name change from "Server Pickles" to "Twisted APplications". * Twisted.Words! This is the Cool Thing Of the Week, see below. * cBanana: Glyph ported banana to C. Don't worry though, we will still be 100% pure-python for the foreseeable future, with C extensions just being optional. C code in Twisted should *never* be touched before coding in Python first, and only translating directly to C. * Twisted.Mail: Moshez is back and better than ever, doing more work on the mail services in Twisted. * Debian: Twisted 0.9.4 is in Debian Sid, the unstable branch. A million thank yous go out to Moshe Zadka, who is the Debian maintainer for Twisted. * manpages: Moshe (what a guy!) also wrote manpages for all the utilities in Twisted, mainly so he could get the Debian package to pass lintian. Thanks again! * More examples: check out the doc/examples/ directory for some snazzy PB demos and more. * Kevin Turner wrote a Whiteboard app, "Napkin", which he just recently got into a usable state. It's not in Twisted CVS yet, but it should be soon. This is a pretty cool app for Twisted, and it's also Kevin's first significant contribution to Twisted. Hooray for Kevin! A round of applause for him! Other Stuff ----------- There has been lots going on involving Twisted even outside of progress in the codebase. There's been a sudden growth-spurt in Twisted's popularity, and a lot of people are starting to use it for their own projects. Tv, a now-regular of #Python, reimplemented his mc-foo[2] program using PB. It's basically a super- advanced MP3 player/list manager, that used to use XML-RPC. It took him 5 hours to figure out PB and reimplement the entire thing using it. DavidC_ implemented a simple chat server/client for a game that he's making. We all want him to use Words, but it's cool that he's using PB anyway. :-) In the process of doing this, he implemented a neat little STDIO Protocol that will probably be assimilated by Twisted soon. There was a whole lot of conversing on the mailing list this week, a summary of it follows. Kevin Turner started a thread[3] on Configuration, Persistence and Version Control. A conversation followed in which Glyph pointed out that configuring Twisted really can be as flexible as configuring other things, through version controlling your TAP files as well as your initial start-up configuration scripts. Chris Armstrong posted a flaming[4] message about the naming of 'tcp.Port'. He proposed "Listener" instead, and a rather long thread resulted. But, so far this has resulted in nothing. (Let's all go egg Glyph's house!) Pokey the Penguin sent a comforting message[5] to the list, informing us that the Chinese weapons used in Code Red are inferior. Glyph agreed with a resounding "YES!". Ironically, it was later found that when a Twisted Web server got hit by Code Red, it was actually causing an exception to occur, although harmless. The reason for this is that Code Red does not specify a HOST header, which makes it an invalid HTTP request. Oh well, no harm done. Kevin Turner started a very informative thread[6] in which Glyph taught him about PB. Anyone who wants to learn it and is annoyed by the lack of documentation should probably go read it, as well as looking at the simple examples in doc/ examples/. M.J. Stahl showed some interest[7] in working on Reality. He had a problem getting it working, and Glyph and Chris Hadgis helped him out a little bit, but he hasn't replied since. Come on, M.J.! We'll help you however we can! :-) Cool Thing Of the Week ---------------------- Twisted Words Twisted Words is the coolest new addition to Twisted. It's basically an IRC/IM killer, which uses spread.pb. Glyph's been working hard on this, and has already interfaced the IRC service to it, as well as started on a web administration interface. He also started writing InstanceMessenger, the GTK user interface to twisted.words, and it has basic buddy list and messaging functionality. Other than the obvious use for Words (normal every-day conversations), another plus that is inherent in it's use of PB is that it is well-integrated with other PB-using programs. One could start both a game service and a Words service on the same port, and the game client could utilize both through the same connection, allowing for in-game chat, as an example. Thanks a whole lot Glyph! Ok, that's it for this week. Thanks for reading! Chris Armstrong <carmstro(a)twistedmatrix.com> References ---------- [1] http://twistedmatrix.com/downloads [2] http://mc-foo.sourceforge.net [3] http://www.twistedmatrix.com/pipermail/twisted-python/2001-July/000140.html [4] http://www.twistedmatrix.com/pipermail/twisted-python/2001-July/000145.html [5] http://www.twistedmatrix.com/pipermail/twisted-python/2001-August/000161.ht… [6] http://www.twistedmatrix.com/pipermail/twisted-python/2001-August/000166.ht… [7] http://www.twistedmatrix.com/pipermail/twisted-python/2001-August/000172.ht… [View Less]

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[Twisted-Python] [bug] spread/ui/gtkutil.Login, bad errback
by Kevin Turner Aug. 6, 2001

Aug. 6, 2001

Try logging on (with words or gtkmanhole) to a host which doesn't accept your connection, and you get: Traceback (innermost last): File "/home/kevint/cvs/zaibach/Twisted/twisted/spread/pb.py", line 972, in connectionLost errback() TypeError: call of non-function (type tuple) but browsing the source does not reveal any obvious flaws.

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[Twisted-Python] Napkin
by Kevin Turner Aug. 6, 2001

Aug. 6, 2001

Napkin is a whiteboard service over PB. The server is nominally functional, and there's a pygame client which serves as proof of concept, though be warned it's hella ugly. The code, that is, as there isn't a GUI to insult ;) 1 is freehand-tool 2 is lines-tool (click some points, and then mouse2-click to send) T is text-tool (click, type, <ENTER> sends) I've only played with it over loopback so far. You can ooggle the code at ~acapnotic/src/napkin or http://twistedmatrix.com/users/… [View More]

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[Twisted-Python] a - a cursed -1 pipe named .twistd-web-pb (weapon in hand)
by Glyph Lefkowitz Aug. 5, 2001

Aug. 5, 2001

I know that I'm probably the most familiar one with this code, but if anyone can figure out why it is that unix pipes often appear to hang forever when you try to connect to them, and generally behave incorrectly with twisted.internet, I'd like to know. The code all appears to work just fine even with numeric unix sockets. As soon as I can I'll sit down with a W. Richard Stevens book and figure out what's going on, but until then it's a constant annoyance to have to be manually fixing up … [View More]

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[Twisted-Python] fwd: twisted_0.9.4-1_i386.changes INSTALLED
by Moshe Zadka Aug. 5, 2001

Aug. 5, 2001

Enjoy! To: Moshe Zadka <moshez(a)debian.org> From: Debian Installer <installer(a)ftp-master.debian.org> Subject: twisted_0.9.4-1_i386.changes INSTALLED Installing: twisted_0.9.4-1_i386.deb to pool/main/t/twisted/twisted_0.9.4-1_i386.deb twisted_0.9.4-1.diff.gz to pool/main/t/twisted/twisted_0.9.4-1.diff.gz twisted_0.9.4-1.dsc to pool/main/t/twisted/twisted_0.9.4-1.dsc twisted_0.9.4.orig.tar.gz to pool/main/t/twisted/twisted_0.9.4.orig.tar.gz Announcing to debian-devel-… [View More]

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[Twisted-Python] Man Pages Project
by Moshe Zadka Aug. 5, 2001

Aug. 5, 2001

As twisted's Debian maintainer, it bothers me greately that there are no man pages. I've started to write manpages for some of the utilities, available in doc/man/*.1. Please help me, and write a manpage for a utility today. I am strongly considering to package only things in bin/ with a manpage for twisted 0.9.5 Here is the list of utilities with a man page so far: faucet gnusto mktap twistd Here is the list of utilities without a man page malyon im mapeditor runtests twistd-debug Thanks … [View More]

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[Twisted-Python] [spread] "We're walking, we're walking, we're walking..."
by Kevin Turner Aug. 5, 2001

Aug. 5, 2001

[Yes, I do intend to spend some more time digesting this and working it into code and perhaps more english, but that won't get done tonight... So for now, Share and Enjoy!] IRC log started Thu Aug 02 00:06:16 2001 (PDT -0700) * Acapnotic pokes glyph <glyph> Acapnotic: sorry, did you answer before? <Acapnotic> glyph: Ok, I started the log ten minutes ago for you, and so far it mainly consists of descriptions of thirmite's van =) <dash> haha <… [View More]thirmite> my van is awsome <dash> "ph34r my l33t v4n" <thirmite> heh <glyph> Acapnotic: OK. Let's get started then. :) <glyph> Acapnotic: What do you want to do with PB? <Acapnotic> glyph: whiteboard, say. client -> server -> many-clients. but we can start with just half of that. <glyph> Acapnotic: OK. First thing you need is a whiteboard service on the server. <glyph> Acapnotic: by "service" I literally mean a subclass of pb.Service <Acapnotic> a pb.Service, okay. That doesn't have many methods <glyph> Acapnotic: crap. I think I may have changed some naming here :-). Does your version say anything about getPerspectiveNamed? <Acapnotic> glyph: yes, getPerspectiveNamed(self,name) is the only method <glyph> Acapnotic: Ok, cool. <glyph> Acapnotic: So you have to implement that method to retrieve something that represents a viewer of whiteboards <glyph> Acapnotic: twisted.reality.plumbing can provide an example for this. <glyph> uh, actually twisted.reality.reality.Reality, now that I think of it :) <dash> reality, reality, REALITY! (ta-daa!) <dash> glyph: you have such a way with names <Acapnotic> "a viewer" probably being a front-end? or the client that's got a display attached? <glyph> dash: everybody has a bad day sometimes :-\ <dash> glyph: no, i like it <dash> it's a as subtle as a jackhammer :) <glyph> Acapnotic: It's the back-end, not the front-end. We're still on the server. <glyph> Acapnotic: whatever you return is the thing that the authenticated user is going to be able to call methods on; it should be a subclass of pb.Perspective <Acapnotic> ah, okay, I was derailed for a moment there getting stuck on "viewer". but this isn't just a passive thing, it's what we call on to modify the whiteboard as well, ja? <glyph> yes <glyph> hmm, maybe we should do this tomorrow, *AFTER* I check in these changes <Acapnotic> no two days the same, eh? <Acapnotic> glyph: Ok, then don't give me specifics on every method I need to override. Big picture -- what classes go on which end, what talks to what? <glyph> Acapnotic: welll, after hte handshake we just described, you've got a Perspective on the server <glyph> the client has a Reference to that Perspective <glyph> so when the client says perspective.foo(bar, baz), the server's perspective gets x.perspective_foo(bar, baz) called on it <Acapnotic> glyph: Okay. And is this one of your "there are no return values" areas? <Acapnotic> yes, because calls are asyncronyous... crap, I can't spell these days. <glyph> Acapnotic: Yes. There are no return values; if the client wants to get a callback when the return value's ready, it calls p.foo(bar, baz, pbcallback=qux) <Acapnotic> glyph: So now I can do whiteboard_author_client->server. To do server->whiteboard_audience_client, will I flip this around and put a "server" in each client? (a la X) <glyph> Acapnotic: No need. <glyph> Acapnotic: You can just have each interested "listener" pass a subclass of "pb.Referenced" into a remote callback, which defines a method that the server will call. <Acapnotic> glyph: so I'm just going to stash a bunch of these Referenced callbacks in some private attribute, and then run through them whenever I want to talk at them? <glyph> Acapnotic: essentially, yes. <Acapnotic> glyph: now you said these subclasses_of(pb.Referenced) defined a method to call. Does that mean I should have them __call__able? Or will I call their methods? Or is that entirely up to me? <glyph> Acapnotic: Subclasess of pb.Referenced define methods named remote_XXX; remoteobj.XXX() on the other side will invoke those methods. <Acapnotic> glyph: and I missed a piece of the handshaking. Where did the client/server connection happen? <glyph> Acapnotic: that's irrelevant :) <glyph> the way that happens is just you instantiate a tcp.Client with a Broker as the protocol <glyph> all fo these interactions happen through the pb.Broker <glyph> (requestPerspective, to be precise) <Acapnotic> ok, that's good to know, I wouldn't call that irrelevant =) -- "...we're stopped." [View Less]

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