Mailman 3 March 2004 - Twisted-web

Test
by Philippe Lafoucrière Aug. 5, 2021

Aug. 5, 2021

Hi all just a test

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Performance of twisted web with HTTP/1.1 vs. HTTP/1.0
by Jason Sibre April 5, 2004

April 5, 2004

Hi folks, I'm using Quixote, and have recently started using Twisted instead of/in addition to Medusa to add SSL support to a web app. Ever since doing so, I've had the feeling that Twisted was slower than Medusa, but whenever I ran profiles of the app using ab (apache bench), the numbers indicated that twisted was comparable to medusa (a little slower, but only very slightly, and not enough that I should notice it 'seat of the pants', and not surprising considering it seems to be a more robust implementation). Today I noticed the problem again, (on a page that had lots of little icon type images) and decided that I *wasn't* going insane, it was definitely slower. Some more ab tests, and performance looked comparable to Medusa. Mind you, even though I'm adding Twisted because I want the SSL support, my tests are not using that SSL. In fact, at one stage, I even removed the code from my start script that enabled SSL to make sure that wasn't the problem. ab uses HTTP/1.0 to test an app, and of course most browsers use HTTP/1.1. I set up another, more sophisticated, test suite (ACT), where I could control the protocol, and ran the tests through it, and I confirmed that the protocol level was definitely the culprit. I ran the test using HTTP/1.0, and again using HTTP/1.1 (nothing else changed). Using HTTP/1.0, twisted served a small image about 131 times per second, but using HTTP/1.1 it dropped to about 5 requests per second. Yes, "Five." Has anyone else seen this type of behavior? Any ideas if it's something I may be doing wrong, or is this a known issue with Twisted? I'm running Twisted 1.2.0 (latest stable release) on Linux with Python 2.3.3 and have looked in the archives of twisted-web and twisted-users, and haven't seen anything about this. I'm not a member of this list, so if you have a reply, please cc me directly. Thanks, Jason Sibre

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Nevow FAQ proposal
by Michal Pasternak March 30, 2004

March 30, 2004

Hello, below is my proposal for a Nevow-newbie FAQ. The only problem is, someone has to answer them, but I belive you can do that ;) 1. How could I change the way the form is displayed? Edit freeform.py? Are there any other alternatives? Eg. I'd like to have each form enclosed in <table>, each field is a row in form of <tr><td align=right>label: </td><td> field </td></tr> 2. What good is formless.Group for? 3. How can I have a bunch of text fields in a one field? For example, I'd like to create a date entry field - 4 digits in one field, and 2 digits per next 2 fields, and I'd like it to display in one line, separated by dashes. Could I somehow group a few formless.Integer fields in one line and separate them by dashes, or should I create a totally new field type (just like the fields in freeform.py are reated) ? 4. What does formless.Table do? -- Michal Pasternak :: http://pasternak.w.lub.pl :: http://winsrc.sf.net For your Occupation, choose 2 of the following three: 1) Fun, 2) Well-paying, 3) Legal.

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[PATCH] Nevow debianization
by Tommi Virtanen March 29, 2004

March 29, 2004

Hi. Here's a patch that adds Debian packaging to Nevow. But, before you add it to the CVS repository, I'd like to ask what are your feelings as to how and who should maintain nevow.deb? 1) Should it be done pretty much like with Twisted, with the "official" debian/ dir stored in the upstream CVS. 2) Should you just totally ignore the fact that there is any Debianization going on, and let someone (me?) use a patch like the attached one? 3) Should there be an "unofficial" debianization stuff in Nevow CVS, and a separate "official" version by someone (me?). Option 1) pretty much requires giving the Debian maintainer CVS commit access.

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A problem with convertToData in nevow.accessors
by Russell Duhon March 26, 2004

March 26, 2004

-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 I'm starting work on an app and ran into an odd little problem, and while in general I'd love to hack around on nevow to figure out exactly where its arising I need to go to sleep now, and would like to be able to progress on my project come tomorrow. Basically, I've got a data function that returns a Deferred (from the adbapi dbpool's runQuery method)-- that seems to get handled just fine - -- which is used for a sequence rendering. However, in the function convertToData in accessors.py, an error occurs: (nevow is just checked out from CVS, twisted is checked out from CVS a few days ago. I did install Nevow in site-packages, but I don't think that would be causing this). 2004/03/25 21:57 CST [-] FAILURE ! [Failure instance: Traceback: exceptions.AttributeError, ListContainer instance has no attribute 'get' 2004/03/25 21:57 CST [-] /System/Library/Frameworks/Python.framework/Versions/2.3/lib/python2.3/ site-packages/twisted/internet/defer.py:338:_runCallbacks 2004/03/25 21:57 CST [-] /System/Library/Frameworks/Python.framework/Versions/2.3/lib/python2.3/ site-packages/nevow/accessors.py:15:convertToData After educating myself somewhat on interfaces, I changed the code to help me debug the issue: def convertToData(data, context): from twisted.python import log log.err('data: ' + str(data)) log.err('data type: ' + str(type(data))) newdata = IGettable(data, persist=False, default=None) log.err('newdata: ' + str(newdata)) if newdata is not None: newdata = newdata.get(context) if isinstance(newdata, Deferred): return newdata.addCallback(convertToData, context) else: return convertToData(newdata, context) else: return data (original function was: def convertToData(data, context): newdata = IGettable(data, persist=False, default=None) if newdata is not None: newdata = newdata.get(context) if isinstance(newdata, Deferred): return newdata.addCallback(convertToData, context) else: return convertToData(newdata, context) else: return data ) Well, that produced some semi-mystifying results: 2004/03/25 21:57 CST [-] "data: [['samson and delilah', 'delilah and frank']]" 2004/03/25 21:57 CST [-] "data type: <type 'list'>" 2004/03/25 21:57 CST [-] 'newdata: <nevow.accessors.ListContainer instance at 0x111d968>' 2004/03/25 21:57 CST [-] FAILURE ! [Failure instance: Traceback: exceptions.AttributeError, ListContainer instance has no attribute 'get' 2004/03/25 21:57 CST [-] /System/Library/Frameworks/Python.framework/Versions/2.3/lib/python2.3/ site-packages/twisted/internet/defer.py:338:_runCallbacks 2004/03/25 21:57 CST [-] /System/Library/Frameworks/Python.framework/Versions/2.3/lib/python2.3/ site-packages/nevow/accessors.py:19:convertToData My guess is that IGettable is in this case supposed to return the None of the default argument, and thus the list itself be returned, but I'm not absolutely certain of that, and if that is what's supposed to happen, I'm in the dark as to why its not happening, and would need to peruse how Nevow handles interfaces a fair amount more, I think. -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.2.4 (Darwin) iD8DBQFAY61qFZO4LxR6+NgRAnE5AJ0TrpTFHOqJ/jP2yjAiz8pbpSgg2gCfXYtz uqLcFj09SklpstYAKdRNZh4= =yIwf -----END PGP SIGNATURE-----

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Nevow: directive("header")
by Mary Gardiner March 21, 2004

March 21, 2004

Hi, I've been learned Nevow mainly by instinct, so this may be documented somewhere and I can't find it. If I wanted to produce XML that looks something like: <tag1> <tag2/> <tag3/> <tag4/> <tag4/> ... <tag4/> </tag1> how would I do it? I am using render = directive("sequence") for tag1, and pattern = "item" for tag4. This works fine for: <tag1> <tag4/> <tag4/> ... <tag4/> </tag1> but I want to include those extra tags. I thought setting render = directive("heading") on tag2 and tag3 might work, but it gives the following error: File "/home/mary/src/Nevow/nevow/accessors.py", line 53, in child return self.original[int(name)] exceptions.ValueError: invalid literal for int(): header after a long traceback. The two attached files should demonstrate the problem: noheader.py works, header.py gives the error mentioned. Is this a bug or am I simply going about this the wrong way? -Mary

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Basic authentication in twisted.web
by Grosch Franz-Josef (MPA/DF) March 11, 2004

March 11, 2004

I need basic authentication in twisted.web for an XMLRPC server. After reading the mailing list, the documentation and the code, I came up with the following solution. Since I'm rather new to twisted web, it would be nice if someone could comment on this code. Perhaps it is helpful as an example for others solving the same problem or trying to understand twisted.web and twisted.cred. Short usage instruction: Save the code to basicauth.py Start the server: twistd -noy basicauth.py http://localhost:8080/ will show the file "basicauth.py" after authenticating with user "bob" and password "123" By the way, twisted is fantastic. Franz-Josef Grosch -- Tenovis Comergo - Applications

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MVC on Nevow
by Jose Figueras March 11, 2004

March 11, 2004

Hi all I'm developing one Nevow webapp proto before the big one webapp (you know, python packages, n-tier, MVC, html documents, pictures, stylesheets, etc...). What must I do to develop a Nevow MVC app ? Suppose this directory structure: [PYTHONPATH]/a/b/c/model/ [PYTHONPATH]/a/b/c/view/ [PYTHONPATH]/a/b/c/controller/ this TAC file: from twisted.application import service from twisted.application import internet from nevow import appserver from a.b.c.controller import main application = service.Application("proto") internet.TCPServer( 8080, appserver.NevowSite( main.MainPageRenderer() ) ).setServiceParent(application) and this Nevow resource (on [PYTHONPATH]/a/b/c/controller/main.py): import os from nevow import rend class MainPageRenderer(rend.Page): docFactory = rend.htmlfile(os.path.join(os.path.split(__file__)[0], "../view/main.html")) 1. How must I define this 'NevowSite' and <a> tags on this HTML file (remember, [a_very_big_path]/a/b/c/view/main.html) to point other static HTML documents (on, p.e. [a_very_big_path]/a/b/c/view/second.html) ? 2. and what about dynamic pages created by 'rend.Page' instances (on, p.e. [PYTHONPATH]/a/b/c/controller/third.py) ? 3. Last, how can I implement (and use) one 'controller' in this situation ? Jose

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Re: WebDAV for Twisted
by Joel Boehland March 8, 2004

March 8, 2004

No one has commented on this, but I just want to say that this seems very cool, and I'll be trying it out in the near future. I think WebDAV in Twisted would be great. --Joel

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Nevow guard with other than 'root' resource
by Janne Junnila March 7, 2004

March 7, 2004

This is the first time I post to this list and my question follows: I've tried to use Nevow's guard with non-root resource (Else than NevowSite). The problem that raises upon is following: exceptions.AttributeError: 'SessionWrapper' object has no attribute 'renderHTTP' The code I use goes like this: <SNIP /> def __init__(self): realm=MyRealm() self.fooportal=portal.Portal(realm) myChecker=DatabaseChecker() self.fooportal.registerChecker(checkers.AllowAnonymousAccess(), credentials.IAnonymous) self.fooportal.registerChecker(myChecker) def getDynamicChild(self, name, request): if(name=='foo'): return guard.SessionWrapper(self.fooportal) <SNIP /> So are there good ways to get it working like this, or do i have to use some trick to do it, or (worst of all) is it even possible? Nevow rules, thank you. =) Janne Junnila

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