Mailman 3 August 2003 - Twisted

[Twisted-Python] Some doubts abot guard.
by Francisco Miguel Colaço 16 Aug '03

16 Aug '03

Dear friends, Somehow I have managed to put the site authentication to work. I still have some doubs about guard: 1. If I try to run the site off index.rpy, I am redirected to 'host:port/session-init', which has no resource. I have to put 'http://hostname:port:file.rpy' in order for the site to load correctely. How can I correct this behaviour? 2. How can I enter a custom page upon login failure? 3. How should I access the session and the user information using newcred, since 'cred' is (according to this own mailing list) being deprecated? 4. I wish to do a slashdot/plone type of site on woven. Is anybody doing the same. I can offer to help out. Please reply to the mailing list so that everyone can know about it and join in. Thanks in advance, Francisco Colaço

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[Twisted-Python] zserver to twisted migration
by Ray Price 15 Aug '03

15 Aug '03

I am new to Twisted and I'd like to move a few applications from the Zope Zserver to Twisted. It is easy to install code within Zserver by adding the following lines to z2.py: #install my own handler sys.path.insert(0,"/usr/local/mycode") theModule=zhttp_handler('moduleName',"/cgi-bin/") hs.install_handler(theModule) What would be involved in running the above module in twisted? Thanks, Ray

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[Twisted-Python] Using users/roles with Woven
by Kevin Howe 15 Aug '03

15 Aug '03

Hi, I've been examining /sandbox/glyph/dynademo in order to learn about guard, and have a question about where to store login information. NOTE: I am ultra-new to twisted, so please correct me if I am totally off base here :) User accounts stored in RDBMS: User table (user information) user_id, first_name, last_name, email Roles table (actions the user is allowed to perform) user_id, role A user may have multiple roles. Once a user is logged in their profile is fetched from the "User" table and their permissions are fetched from the "Roles" table. This needs to be stored for the session so that all pages have access to it. Views are then customized based on the roles, something like the following: class LoggedIn(BasePage): def wvupdate_info(self, request, widget, data): prefs = request.getSession(IPreferences) roles = getattr(prefs, 'roles', []) if 'View Info' in roles: return 'Information' else: return '' Should the login profile/roles be stored somewhere other than Session? The Twisted.Cred documentation seems to suggest that it should be stored in either an Indentity or a Perspective: In order to simplify integration of services that come from lots of different places, Twisted.Cred presents user-account related information in two different ways. Application-independent user information, such as passwords, public keys, and other things related to the existence and authentication of a particular person should reside in an Identity. Information related to a particular service, such as e-mail messages, high scores, or to-do lists should be represented by a Perspective. Could someone explain what a more twisted-style approach might be? - Kevin

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[Twisted-Python] twistedmatrix.com minor correction
by Justin Johnson 15 Aug '03

15 Aug '03

At http://twistedmatrix.com/products/download. the 1.07 alpha is listed, but the info below refers to 1.06 which already released. ----- Twisted 1.0.7alpha4 - Release Candidate This is an Alpha of Twisted. It is not an official release: there may be a number of alphas and RCs before *1.0.6* is considered a candidate for full release. Until then, use this in production at your own risk. If you want the latest stable release of Twisted, see Twisted 1.0.6, below.

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[Twisted-Python] Newbie here - question about Guard
by Dave Thorne 15 Aug '03

15 Aug '03

Hi, My name is Dave Thorne, I am a developer at the Central Manchester City Learning Centre in England, and I have joined this list because I am hoping to use Twisted for a couple of projects I am working on. I have just set up a woven application and I am thoroughly getting into the code and setting everything up, but the one element I am missing is user authentication. I have found twisted.web.woven.guard and think that this is what I want, but I may be wrong. All I need is a way of authenticating my woven application ( my user list is in a database I have - ZODB) so that users can log in and get access to their information. Unfortunately I can't seem to find any information about authentication using the guard classes, and I wondered if anyone could help me. The documentation I have downloaded is incomplete and I can't find anything on the web about it. I'm not too bothered about how the authentication works (i.e. basic authentication of the web browser or a more application driven authentication). If anyone has any documentation, or even a simple example so I can get started that would be a great help. Failing that, does anyone have any experience using the guard classes that would be willing to help me? Of course, if guard is not the method I need, and there is any other way of authentication that I don't know about, it would be nice to be pointed in the right direction. yours Hopefully, Dave

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[Twisted-Python] [twisted-conch] Building own Channels
by mkimpenhaus＠plus.de 15 Aug '03

15 Aug '03

Hi @all i am fairly new to twisted conch an connecting per ssh to servers. I took a look at the sample and everything was working fine. Then I tried to derive from the SSHChannel and gave that channel a new name. F*ck - that seemed to be the wrong way, no connection could be established. I searched the code for some hints and found that there are already some channels (session, forward-tcp and direct-tcp) implemented which seem to work. I was wondering that the derived channel was working when naming it by the name of one of those already implemented channles(session, forward-tcp and direct-tcp). Therefore my question: How do I implement own channels with own names? Best regards and respect, Marcus.

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[Twisted-Python] Documentation about form, guard and *coduicts
by Ali 14 Aug '03

14 Aug '03

Hi, I'm very new to twisted, i read the howtos and i found little info on form, guard and livepage. where can i find more info on those topics??? TIA, Ali ------------------------------------------------- Este mensaje fue enviado usando el servicio de correo en web de Infomed http://webmail.sld.cu

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[Twisted-Python] Problems installing Quotient
by Justin Johnson 14 Aug '03

14 Aug '03

I'm running RedHat 9, Python 2.2.2, Twisted-1.0.7alpha2, latest Quotient, Lupy, and Reverend. After installing Quotient, Lupy, and Reverend, I get the following error trying to run mktap. Do I need to be running from CVS or something? The instructions said 1.0.7alpha1 or greater was okay. IMessage is not defined in twisted.protocols.imap4.py. [jjohn53@marmot jjohn53]$ mktap quotient --help An error unexpected occurred: Traceback (most recent call last): File "/usr/lib/python2.2/site-packages/twisted/scripts/mktap.py", line 182, in run options.parseOptions(sys.argv[1:]) File "/usr/lib/python2.2/site-packages/twisted/python/usage.py", line 210, in parseOptions self.postOptions() File "/usr/lib/python2.2/site-packages/twisted/scripts/mktap.py", line 166, in postOptions self.parseOptions(self.params) File "/usr/lib/python2.2/site-packages/twisted/python/usage.py", line 199, in parseOptions self.subOptions = parser() File "/usr/lib/python2.2/site-packages/twisted/scripts/mktap.py", line 107, in <lambda> [x, None, (lambda obj = y: obj.load().Options()), getattr(y, 'description', '')] File "/usr/lib/python2.2/site-packages/twisted/python/plugin.py", line 68, in load return namedModule(self.module) File "/usr/lib/python2.2/site-packages/twisted/python/reflect.py", line 369, in namedModule topLevel = __import__(name) File "/usr/lib/python2.2/site-packages/quotient/tap.py", line 15, in ? from quotient import login, grabbers, smtpin File "/usr/lib/python2.2/site-packages/quotient/login.py", line 41, in ? from quotient.imapbox import Account as IMAP4Account File "/usr/lib/python2.2/site-packages/quotient/imapbox.py", line 13, in ? from twisted.protocols.imap4 import IAccount, IMailbox, IMessage, IMAP4Server, statusRequestHelper ImportError: cannot import name IMessage [jjohn53@marmot jjohn53]$

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[Twisted-Python] Deleting packages from Twisted and breaking all your code (THIS MEANS YOU)
by Glyph Lefkowitz 14 Aug '03

14 Aug '03

Did the title get your attention? Good. If you know someone with deployed Twisted code which they hope to upgrade whose attention it did not get, please draw their attention here. I would like to remove some of the more incendiary modules from Twisted and put them either into their own repositories for the duration or just put them into my directory in sandbox rather than distributing with the tarball proper. The list for the moment (with attendant plans) is: - twisted.sibling We definitely need something like this, but it is unmaintained and I am unaware of any code that uses it outside of Ninjaneering's proprietary codebase. It should be revisited at some later date once we have re-architected the whole of cred/pb/application, and we can leverage them to do consistent and semi-transparent distribution. - twisted.popsicle Kind of an interesting idea, but totally a research project. There is no more work going into this because it's been empirically determined to be too hard to write a back-end. Probably some neat ideas that might be worth picking up again though. (This is largely being superseded by our persistence strategy on Quotient. Have I mentioned quotient yet? check it out, seriously, it's the best example of the core Twisted team's intent of certain facilities in Twisted than you're likely to find anywhere else. http://www.divmod.org/ ) - twisted.world TOTALLY AWESOME idea that I am really disappointed that I had to let go of for performance reasons. However it is not extensively tested, it is very very VERY slow, it is not even the slightest bit fault tolerant, and it will even lose data under normal operation in some weird corner cases. Also it leaks disk resources really fast. All these problems are fixable and the overall architecture is sound, but it will need a very clever database-head with some serious time on his/her hands to improve. If you have code that relies on any of these, please say something NOW. I would like releases subsequent to 1.1 to start deleting some of the superfluous stuff in the Twisted tree so that our users can feel more comfortable about trusting what's in the core package to be supported. Experimental development projects like these should be carried out elsewhere before being merged in, in the future.

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[Twisted-Python] Support for ICMP / traceroute ?
by twisted＠evpopov.com 14 Aug '03

14 Aug '03

(note to moderators: I sent this message two times before but with a wrong source email. You can safely delete them) Hi, Im currently evaluating Twisted to make cross-platform network developments. The targeted OS are: Win32 (W2K and above), Linux. More Unix flavors would have to be supported later on. >From what Ive read about Twisted, it should work on those platforms as it is python-based. Could you confirm that my own .py scripts will run as-is under those different platforms (provided I myself dont use platform-specific features of course) ? I will need to implement the ping protocol (client side), and most probably also the traceroute protocol. I didnt see those protocols in the doc, but would it be possible to implement them with Twisted ? I saw some classes related to raw sockets, so Im confident it should be manageable. I would like some confirmations its possible and cross-platformly. Note: for traceroute, the TTL of the packet has to be set with each packet: with the socket API, you can use a setsockopt() call to set it, I dont know how it is managed (if it is) with Twisted. Another way would be to build our own IP packet, so that we can set the TTL field. If answers to those questions are positive, then you may have won a new twisted user :). Thanks for any reply.

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