Mailman 3 December 2009 - Twisted-web

Test
by Philippe Lafoucrière 05 Aug '21

05 Aug '21

Hi all just a test

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twisted version of openid
by Raj kumar 01 Jan '10

01 Jan '10

Hi, Currently I'm having a server running under twisted. I'm planning to implement openid in my application. Is there any twisted version of openid api? I need some reference to go through openid examples. Thanks in advance. Raj. The INTERNET now has a personality. YOURS! See your Yahoo! Homepage. http://in.yahoo.com/

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Newbie question about chaining deffereds
by Igor Katson 21 Dec '09

21 Dec '09

Hello, I need to download a videofile, a thumbnail to it, process that videofile, and after the processing is finished, process the thumbnail with the result of processing the video. I do this, but it the logic (or the order) is wrong, so it does not work, it freezes after processing the video, while it downloads both of the files: url = 'http://..../video.flv' filename = 'video.flv' video_deffered = downloadPage(url, filename) video_deffered.addCallback(process_video, filename) => process_video returns video_id url = 'http://..../thumbnail.jpg' filename = 'thumbnail.jpg' image_deffered = downloadPage(url, filename) image_deffered.chainDeffered(video_deffered) image_deffered.addCallback(process_image, filename) =< video_id needed here What should I change for it to work? And also I need to make process_video and process_image work in threads, but I can't figure out how to solve this problem first.

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twisted web write to a connection closed from client-side
by Andrew Gryaznov 15 Dec '09

15 Dec '09

Hi, I have a problem: twisted does not indicate/throw exception when user has stopped reading the stream via "STOP" browser button (I guess it won't do in any other case of connection drop). Is this intended behavior and is there any way to detect that the data written to request goes nowhere? I am using twisted web to write HTTP stream that is read form asynchronous source continuously. I'm using Resource and NOT_READY_YET, then I just do request.write() infinitely until, and if, the source stops the stream, then do request.finish(). If the source does not stop and I stop the stream by hitting browser "stop" button - the twisted server continues reading source infinitely. Could not find any information about how connection resets are handled by twisted web

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Re: [Twisted-web] Mantissa dead? => Nevow? => web? for person who doesnt want to use django
by Gas 14 Dec '09

14 Dec '09

On 14/12/2009, at 8:36 PM, Gas wrote: > Hi > > I muck around in twisted and am trying to setup a site for a club and would like to use twisted as much as possible because I like it. So saw stuff on Axiom and liked that then found mantissa only problem is nothing on web on how to get mantissa to work that actually works .. So I've lost a few hours trying to get it going with latest svn on python 2.5 (2.6 you get normal 2.5 code in 2.6 warnings (ie md5 etc) plus axiom/_pysqlite2.py needs to point to sqlite3 otherwise same errors) but keep getting the > > File "/Users/gas/src/py/twisted/axiom-tests/Wiki/xmantissa/plugins/wikioff.py", line 3, in <module> > from xmantissa import website, offering, provisioning > exceptions.ImportError: cannot import name provisioning > > error which came up in this forum in Feb 2008 t but that is about it that I can find on web. > > I presume this error is related to the mantissa install issue - which Im not sure how to debug/fix: > <snip> > ersion=Version('xmantissa', 0, 7, 0) # (SVN r17880)), > <class 'axiom.plugins.mantissacmd.Mantissa'>, > <class 'axiom.plugins.mantissacmd.RemoteStats'>, > Version('xmantissa', 0, 7, 0) # (SVN r17880), > <class 'xmantissa.port.PortConfiguration'>, > <class 'axiom.plugins.mantissacmd.Generate'>, > <class 'axiom.plugins.axiom_plugins.Browse'>, > <class 'axiom.listversions.ListVersions'>, > <class 'axiom.plugins.axiom_plugins.Upgrade'>, > Version('axiom', 0, 6, 0), > <class 'axiom.plugins.axiom_plugins.Insert'>, > <class 'axiom.plugins.axiom_plugins.Extract'>, > <class 'axiom.plugins.axiom_plugins.UserBaseCommand'>, > <class 'axiom.plugins.offeringcmd.OfferingCommand'>] > Traceback (most recent call last): > File "/Users/gas/Library/Python/2.6/site-packages/epsilon/setuphelper.py", line 12, in pluginModules > yield namedAny(moduleName) > File "/Users/gas/Library/Python/2.6/site-packages/Twisted-9.0.0-py2.6-macosx-10.6-i386.egg/twisted/python/reflect.py", line 469, in namedAny > raise ObjectNotFound('%r does not name an object' % (name,)) > ObjectNotFound: 'build.lib.axiom.plugins' does not name an object > Traceback (most recent call last): > File "/Users/gas/Library/Python/2.6/site-packages/epsilon/setuphelper.py", line 12, in pluginModules > yield namedAny(moduleName) > File "/Users/gas/Library/Python/2.6/site-packages/Twisted-9.0.0-py2.6-macosx-10.6-i386.egg/twisted/python/reflect.py", line 469, in namedAny > raise ObjectNotFound('%r does not name an object' % (name,)) > ObjectNotFound: 'build.lib.nevow.plugins' does not name an object > Traceback (most recent call last): > File "/Users/gas/Library/Python/2.6/site-packages/epsilon/setuphelper.py", line 12, in pluginModules > yield namedAny(moduleName) > File "/Users/gas/Library/Python/2.6/site-packages/Twisted-9.0.0-py2.6-macosx-10.6-i386.egg/twisted/python/reflect.py", line 469, in namedAny > raise ObjectNotFound('%r does not name an object' % (name,)) > ObjectNotFound: 'doc.listings.interstore.xmantissa.plugins' does not name an object > Full plugin list for 'nevow.plugins': > [<nevow.athena.AutoJSPackage object at 0x10363fe50>, > <nevow.athena.AutoCSSPackage object at 0x10363f750>, > <nevow.athena.AutoJSPackage object at 0x10363fd10>] > > > (ps this debug was form my mac machine but have done it on ubuntu 2.5 install with same results) > > So my questions are - being a twisted and web NOB seeing Divmod died/disbanded (I think 6 months ago?) and Mantissa doesnt look like its been touched for 2 years, and Nevow??? --- I'm not sure what is strategy if you want to develop a web app with twisted? > > Do I continue and try and work out the code for Mantissa (which I doubt Im capable of being a programming NOB), try to do it via Nevow or go back to JPs web in 60 second tutorial and work out a web application from there? > > Any pointers most appreciated > > Gas > > PS mucked around and got Combinator going which i liked however if you are developing a Mantissa app then combinator didnt work as you really needed too install mantissa and all its dependencies so you could get access to the axiomatic script or did I miss something? Is that the issue with Combinator that if python source installs scripts you still need to install the source in your site-packages? So is Combinator still valid or shall I look at things like bzr and use same Twisted development method ie of branches? > > > +34618525900 > agasson(a)red-elvis.net > > > > Gas +34618525900 agasson(a)red-elvis.net

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Was a minion invited to participate in Pycon 2010 Form Generation Panel?
by Stephen Waterbury 09 Dec '09

09 Dec '09

I see that such a panel discussion is being formed -- just hoping that someone in Twisted was invited ... were they? (Actually, I'd like to see both Formless *and* Nevow Forms represented, if possible. :) Steve

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Connection lost in a non-clean fashion
by Bill Oldroyd 09 Dec '09

09 Dec '09

I have developed a web server based on twisted-web that acts as a gateway between the SRU search protocol and the Z39.50 search protocol. ( Details at http://www.loc.gov/z3950/agency/ ) Each SRU search request opens a thread which performs a Z39.50 search on a remote target and then returns the results which are converted into the SRU response. Sometimes the connection with the client issuing the SRU request is lost. In a few cases this produces the message "Connection to the other side was lost in a non-clean fashion: Connection lost. ". When several of these non-clean connection losses occur the web server will become unresponsive and will not respond to any new requests. Can anyone help with how I should respond to these non-clean lost connections ?. I can't find any documentation which helps me understand the impact of this type of error. As the connection is lost there is no point in returning any error response, but are there systems resources left allocated which might be causing the server to become unresponsive. Bill -- Bill Oldroyd Technical consultant for The European Library

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[Athena] Is ReliableMessageDelivery really necessary?
by Paul Thomas 07 Dec '09

07 Dec '09

Hi, I've hit a problem as my app has got bigger (about 30-40 widgets now, all chattering roughly once every 2 seconds) where the reliable message delivery mechanism is spiralling out of control. It seems that the constant back and forth means that large 'baskets' of messages are resent. The more this happens, the busier everything gets until the browser becomes unresponsive. There's a fix for it: [Divmod-dev] athena duplicate messages issue but I'm slightly concerned about the potential for lost messages - and also confused about how this could happen. Given that HTTP is a reliable connection-oriented transport, where is the gap that messages can fall through? I think I can cope with lost messages in most cases, so would it be useful to add a kind of 'sendRemote' that was like 'callRemote' but didn't care about a response? Or maybe this already exists and I've missed it? Paul. P.S. this app is likely to get more noisy - is it likely that I'll have to abandon Athena for Orbited or similar? I mean, are there architectural differences that will prevent Athena scaling?

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Re: [Twisted-web] ANN: Twisted 9.0.0
by exarkun＠twistedmatrix.com 02 Dec '09

02 Dec '09

On 12:18 am, tjreedy(a)udel.edu wrote: >Christopher Armstrong wrote: >>= Twisted 9.0.0 = >> >>I'm happy to announce Twisted 9, the first (and last) release of >>Twisted in 2009. The previous release was Twisted 8.2 in December of >>2008. Given that, a lot has changed! >> >>This release supports Python 2.3 through Python 2.6, though it is the >>last one that will support Python 2.3. The next release will support >>only Python 2.4 and above. Twisted: the framework of the future! > >Not unless it supports 3.1+. Is that in the cards (tickets)? Somewhat. A description of the plan on stackoverflow: http://bit.ly/6hWqYU A message with some ticket links from a thread on the twisted-python mailing list: http://bit.ly/8csFSa Jean-Paul

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ANN: Twisted 9.0.0
by Christopher Armstrong 02 Dec '09

02 Dec '09

= Twisted 9.0.0 = I'm happy to announce Twisted 9, the first (and last) release of Twisted in 2009. The previous release was Twisted 8.2 in December of 2008. Given that, a lot has changed! This release supports Python 2.3 through Python 2.6, though it is the last one that will support Python 2.3. The next release will support only Python 2.4 and above. Twisted: the framework of the future! You can download the new release at our web site, http://twistedmatrix.com/ There were around 285 tickets resolved in this release. The full list of changes is available here: http://twistedmatrix.com/trac/browser/tags/releases/twisted-9.0.0/NEWS?form… It's quite a huge list of changes spanning almost all of the Twisted projects, so here are some of the more exciting changes: In the core: - The Windows IOCP reactor now supports SSL. - The memcache protocol implementation got some nice new features. In Twisted Web: - There's a new HTTP client API and protocol implementation, starting at twisted.web.client.Agent. It's still pretty low-level, but much more flexible than the old API. - There were many improvements to the WSGI support. In Twisted Conch: - PyASN1 is now used to parse SSH keys (which means you now need to install it to use Conch). - SFTP servers (especially on Windows) now behave a lot better. In Twisted Mail: - The IMAP server and client protocol implementations had many fixes. For example, SASL PLAIN credentials now work. In Twisted Words: - XMPP clients now support the ANONYMOUS SASL authentication type. - The IRC protocol implementations had many fixes. And a lot more. = What is Twisted? = >From the web site: Twisted is an event-driven networking engine written in Python and licensed under the MIT license. See the FAQ for commonly asked questions about Twisted. http://twistedmatrix.com/trac/wiki/FrequentlyAskedQuestions If you want to get started with Twisted, the first thing you should do is read the Twisted Core Documentation. http://twistedmatrix.com/projects/core/documentation/howto/index.html Twisted projects variously support TCP, UDP, SSL/TLS, multicast, Unix sockets, a large number of protocols (including HTTP, NNTP, IMAP, SSH, IRC, FTP, and others), and much more. Enjoy! -- Christopher Armstrong http://radix.twistedmatrix.com/ http://planet-if.com/

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