Mailman 3 May 2003 - Twisted

[Twisted-Python] Twisted Python 0.7.0 Prerelease Testing
by Glyph Lefkowitz 05 Aug '21

05 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/

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[Twisted-Python] Twisted.web and adbapi example?
by Morrow, Paul 22 Jun '03

22 Jun '03

I've been pouring through the docs and examples, but can't find an example of a .rpy that generates a page containing the results of a database query. How would such a thing be properly architected? Clearly the adbapi would be involved, but then how do I get the query results into the string returned by my resource? Or would I use a deferred instead? Would someone please share a little code snippet (or point me at one)illustrating how that would best be accomplished? Thanks.

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[Twisted-Python] Allow static.Data to be at the root
by Matthias Urlichs 21 Jun '03

21 Jun '03

Here's a small patch to allow a twisted.web.static.Data element at the root of your web space. diff -Nru a/twisted/web/static.py b/twisted/web/static.py --- a/twisted/web/static.py Tue May 13 10:22:32 2003 +++ b/twisted/web/static.py Tue May 13 10:22:32 2003 @@ -59,6 +59,12 @@ request.setHeader("content-length", len(self.data)) return '' return self.data + + def getChild(self,path,request): + """Return myself if I am the root.""" + if path == '' and request.path == "/": + return self + return resource.Resource.getChild(self,path,request) def addSlash(request): host = request.getHeader("host") -- Matthias Urlichs | {M:U} IT Consulting @ m-u-it.de | smurf(a)smurf.noris.de Disclaimer: The quote was selected randomly. Really. | http://smurf.noris.de -- "I believe in eight of the ten commandments; and I believe in going to church every Sunday unless there's a game on." [Steve Martin]

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[Twisted-Python] Getting Rid of Application in a Compatible Way
by Moshe Zadka 16 Jun '03

16 Jun '03

I suggest to write ApplicationService classes which look like: class TCPListener(ApplicationService): def __init__(self, port, factory, backlog=5, interface='', *args, **kwargs): self.port = port self.factory = factory self.backlog = backlog self.interface = interface ApplicationService.__init__(self, *args, **kwargs) def __getstate__(self): d = self.__dict__.copy() d['_port'] = None return d def startService(self): ApplicationService.startService(self) self._port = reactor.listenTCP(self.port, self.factory, self.backlog, self.interface) def stopService(Self): ApplicationService.stopService(self) self._port.stopListening() self._port = None Now, instead of application.listenTCP we can use TCPListener(8080, server.Site(resource), "foo").setServiceParent(application) The only problem is needing to choose unique names. I suggest ApplicationService will lose the unPythonic if not isinstance(serviceName, types.StringType): raise TypeError("%s is not a string." % serviceName) And add to app.py class Unique: pass This means that "unnamed" services are now possible: TCPListener(8080, server.Site(resource), Unique()).setServiceParent(application) You can still access a service by its "serviceName", but you have to get the name from the service. This means stuff like cred will still work. Of course, similar Services can be written for UNIXListener, SSLListener, etc. -- Moshe Zadka -- http://moshez.org/ Buffy: I don't like you hanging out with someone that... short. Riley: Yeah, a lot of young people nowadays are experimenting with shortness. Agile Programming Language -- http://www.python.org/

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[Twisted-Python] Woven and WML
by Tim Allen 02 Jun '03

02 Jun '03

I recently got a new WAP-capable phone, and since you can do a lot of interesting things by pointing it at various URLs, I thought I'd try making a cute little website in Woven for my phone to browse. Unfortunately, it seems that this is impossible. The resulting markup from my simple Woven test page had all sorts of woven-stuff all through it - such as pattern attributes that hadn't been removed, and id attributes that were woven's internal IDs, rather than the IDs I tried to set. Modern, capacious HTML browsers wouldn't care, I guess, but my phone's little brain overloaded and gave up. Is this just the way Woven works, or am I likely doing something wrong? For the record, twisted.web can serve up static WML just fine, provided the following patch is applied: Index: twisted/web/static.py =================================================================== RCS file: /cvs/Twisted/twisted/web/static.py,v retrieving revision 1.91 diff -u -r1.91 static.py --- twisted/web/static.py 13 May 2003 04:36:21 -0000 1.91 +++ twisted/web/static.py 31 May 2003 05:25:41 -0000 @@ -175,6 +175,7 @@ ".tif": "image/tiff", ".tiff": "image/tiff", ".txt": "text/plain", + ".wml": "text/vnd.wap.wml", ".xul": "application/vnd.mozilla.xul+xml", ".zip": "application/x-zip", ".patch": "text/plain",

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[Twisted-Python] pb.Copyable docs
by Jeff Hodges 31 May '03

31 May '03

As a newb, I've found the howtos invaluable but I came across a problem when I attempted to write code based on pb.Copyable class. Some of the code holds vaguely described variables such as "state" and "perspective". I've inferred a little bit from other bits of documentation but can't seem to fit it all together. This line was most disconcerting to me: "XXX: understand, then explain use of varying cached state depending upon perspective." Anyone help a poor newbie out? Thanks, folks. -- Jeff

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[Twisted-Python] Woven example for article, Part II
by david mertz 30 May '03

30 May '03

Moshe Zadka wrote: > Software doesn't break when Twisted upgrades. Glyph Lefkowitz |While I echo the general sentiment, I think it's a little overconfident |to be making this claim unqualified. I don't mean to belabor the point, but my first try at the woven tutorial example produced a DeprecationWarning as part of its traceback. My first thought seeing that was that I probably needed an *earlier* version of Twisted, rather than a *later* one, to make the example work. As it turns out, that warning was misleading, since I was apparently using an older Twisted version with a newer server script. I'm not going to bother sorting out exactly what is deprecated, current, and phased out... but I think I've figured out enough to determine that Glyph has the better advice: less than everything stays backward compatible.

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[Twisted-Python] Woven example for article, Part II
by david mertz 30 May '03

30 May '03

Itamar Shtull-Trauring wrote: |The ChangeLog usually doesn't cover code that is unstable. In general, |*always* use the latest version of Twisted. Well, that sounds nice; but it's kinda impractical in a lot of contexts. As I mentioned in an upthread comment, my web host at python-hosting.com has 1.0.3 installed. I've emailed Remi asking him to upgrade--and I suppose he will--but not everyone maintains their own installation/host, nor does everyone want to reinstall large libraries every time s/he writes a new script. Moreover, for me in particular, I want to write some examples for articles. If I write something that works in 1.0.5, but breaks in 1.0.6 and past, that's bad for readers (and makes me look a little worse). And as things go, probably the next Twisted version will be out before my article current article is published. But the story is pretty much the same if I were to implement something for a client--I don't want my software breaking everytime the library changes. I'm not really complaining about any of this. Publishers pay me money to make informed guesses about what software will be stable and what will change (among many other judgements). But it does make it challenging to write the sort of thing I write that covers Twisted. I'll probably wind up going a little light on woven because of this--which is a little bit too bad, since templating is a technology a lot of readers would be interested in. Yours, David...

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[Twisted-Python] Woven example for article, Part II
by david mertz 30 May '03

30 May '03

On Thu, 29 May 2003, david mertz <ibook(a)gnosis.cx> wrote: > To Andrew, and generally: I have installed a local copy of 1.0.5, and > that at least makes the PicturePile example work (there are a few > minor errors in the samples, but straightforward to fix) Moshe Zadka wrote: |There is a reason the documentation comes with the package: |it is relevant to the version it comes with. In particular, the |documentation on tm.com is only relevant to "latest stable". This is |just like Python: if you read documentation from |http://www.python.org/doc/current/, don't count on it working with |Python 2.1. This is very unhelpful, Moshe. The documentation on the Twisted website (as mentioned in my earlier note), unlike most Python standard documentation, does not indicate in which versions the examples work (PicturePile, specifically). Nothing like "new in 1.0.4". Moreover, the errors did not make it obvious there was a version issue (and in any case, the example still needed some minor corrections to work with 1.0.5). Andrew's advice (and some by email) was helpful, but it was hardly obvious a priori what the issue was. Moreover, I have not encountered any change log that addresses woven version differences in any detail. Quite possibly there is such a document, but I do not now know where it is. None of this, btw., means to demean Twisted itself. I do think it could use a bit more directed documentation, but the concept and subpackages themselves seem very useful and well conceived. Yours, David...

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Re: [Twisted-Python] Perspective / Client confusion
by Patrick K. O'Brien 30 May '03

30 May '03

On Friday 30 May 2003 02:36 am, Luc Stepniewski wrote: > On Friday 30 May 2003 02:55, Patrick K. O'Brien wrote: > > This is working so far: > > > > identity = auth.createIdentity('root') > > identity.setPassword('password') > > identity.save() > > > > perspective = AdminPerspective(identity) > > service.addPerspective(perspective) > > identity.addKeyForPerspective(perspective) > > > > perspective = UserPerspective(identity) > > service.addPerspective(perspective) > > identity.addKeyForPerspective(perspective) > > If you do this, when the user root/password will log on, how will twisted > know to which perspective to connect to? How will it differenciate your > connection as adminperspective or userperpective, as you log as the same > user/pass? If you look at twisted.spread.pb you'll see that the pb.connect() function takes both a username (same as identity.name) and perspectiveName as parameters: def connect(host, port, username, password, serviceName, perspectiveName=None, client=None, timeout=None): """Connects and authenticates, then retrieves a PB service. Required arguments: - host -- the host the service is running on - port -- the port on the host to connect to - username -- the name you will be identified as to the authorizer - password -- the password for this username - serviceName -- name of the service to request Optional (keyword) arguments: - perspectiveName -- the name of the perspective to request, if different than the username - client -- XXX the \"reference\" argument to perspective.Perspective.attached - timeout -- see twisted.internet.tcp.Client @returns: A Deferred instance that gets a callback when the final Perspective is connected, and an errback when an error occurs at any stage of connecting. """ So my demo/hack client application supplies those details when a user logs on: def main(self): name = raw_input('Enter your login name (root): ') if not name: name = 'root' password = raw_input('Enter your password (password): ') if not password: password = 'password' perspective = raw_input('Enter your perspective (root:admin): ') if not perspective: perspective = 'root:admin' df = pb.connect(host='localhost', port=8789, username=name, password=password, serviceName='BankingService', perspectiveName=perspective, client=self, timeout=30) df.addCallbacks(self.gotPerspective, self.noPerspective) reactor.run() -- Patrick K. O'Brien Orbtech http://www.orbtech.com/web/pobrien ----------------------------------------------- "Your source for Python programming expertise." -----------------------------------------------

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