Mailman 3 October 2012 - Twisted

[Twisted-Python] Weekly Bug Summary
by exarkun＠twistedmatrix.com 14 Oct '12

14 Oct '12

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[Twisted-Python] txtorcon 0.6
by meejah＠meejah.ca 12 Oct '12

12 Oct '12

-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 txtorcon 0.6 is now tagged and released. txtorcon is a Twisted-based Python asynchronous implementation of the Tor control protocol. It includes a state-tracking abstraction, configuration abstraction, Twisted endpoint support for hidden services, 96%+ unit-test coverage and many examples. New in this release: . debian packaging (mmaker); . psutil fully gone; . *changed API* for launch_tor() to use TorConfig instead of args; . TorConfig.save() works properly with no connected Tor; . fix incorrect handling of 650 immediately after connect; . pep8 compliance; . use assertEqual in tests; . messages with embdedded keywords work properly; . fix bug with setup.py + pip; . issue #15 reported along with patch by Isis Lovecruft; . consolidate requirements (from aagbsn); . increased test coverage and various minor fixes; . https URIs for ReadTheDocs Code and built documentation may be obtained: https://github.com/meejah/txtorcon https://txtorcon.readthedocs.org/en/latest/index.html git clone git://github.com/meejah/txtorcon.git You may also install it directly: pip install txtorcon easy_install txtorcon The sha256sum output is: 4f939e217ea3149175bb1285fa7296edc02ac245a71a60ec77b9cf48511e991e txtorcon-0.6.tar.gz thanks, meejah -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.10 (GNU/Linux) Comment: Processed by Mailcrypt 3.5.8 <http://mailcrypt.sourceforge.net/> iQEcBAEBAgAGBQJQd5uqAAoJEMJgKAMSgGmnTCkIAOGT6QaE+Q8jaBOedE79j/B3 QYMXh1SSfrvxn2x/utmjIgRbvCrCE+lzkxv9T9GXXjAhKSRN2xyyhRxq/Mbxvucd FWb2zHyZIjsTcc//veHYNpRNEWORl1ZIG2kU0muHQPpxY5ZAvtEkW+RA5zMJbhHp LF/JyltsAEu1Ja6HMFsfPmlLZiOtWBkBi3MgGGenUVJsScrtGRNCjWutGEkXxKXe 9pw2W0IGH5YmBAUiAuSW6q4cnyPQroqjSgO+RFfKMVGJNAaSqgUE8UCkcCifyjjM 2cDtGNA50kU0obT8QLgsiRyavePCQSfn9Jr1y8/Ck45Toa9a4FOQbBlOOyQSgrY= =bORU -----END PGP SIGNATURE-----

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[Twisted-Python] Weekly Bug Summary
by exarkun＠twistedmatrix.com 07 Oct '12

07 Oct '12

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[Twisted-Python] Consensus on how to handle "MySQL server has gone away"
by E S 05 Oct '12

05 Oct '12

I have a service running that occasionally connects to a MySQL database. When there is no activity on it for some time, I eventually get the the error _mysql_exceptions.OperationalError: (2006, 'MySQL server has gone away') I have found a few posts on this group related to this issue http://twistedmatrix.com/pipermail/twisted-python/2007-July/015788.html http://twistedmatrix.com/pipermail/twisted-python/2007-October/016178.html as well as some tickets on the twisted homepage: http://twistedmatrix.com/trac/ticket/4404 http://twistedmatrix.com/trac/ticket/4964 I have also seen this referenced as a potential fix: http://www.gelens.org/2009/09/13/twisted-connectionpool-revisited/ I currently have the cp_reconnect parameter set to True, but it does not appear to be doing the job. I don't really see much consensus on how to properly handle this issue. Some people seem to think that the cp_reconnect parameter should take care of it for you, other people say that cp_reconnect is only part of the solution and that you have to write your own error handling. I realize that I could increase the value of MySQL's wait_timeout parameter, but I would rather have the twisted code detect and handle the situation. So, how does one do that? Thanks, Dave

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Re: [Twisted-Python] Introducing Frack, a (partial) replacement for Trac
by Allen Short 05 Oct '12

05 Oct '12

That's strange. I believe that's due to twistedmatrix.com using PB to connect different web server processes together, not anything directly related to the code in Frack. Try this URL? It's working for me currently. http://twistedmatrix.com/users/frack.twistd/ui/ticket.html?id=1956

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[Twisted-Python] Introducing Frack, a (partial) replacement for Trac
by Allen Short 05 Oct '12

05 Oct '12

Twisted's issue tracker is based on Trac, which has had increasingly bad performance over the years. Also, its code and deployment setup are so bad that everyone who has the ability to improve it has tried as hard as possible to avoid touching it at all. So I started writing a new issue tracker compatible with Trac's database, based on Twisted and more modern web technology. But it's incomplete and I'm not a JavaScript expert, so I need your help. If you've ever tried to contribute to Twisted and had to wait on Trac in order to read, comment on, or submit a ticket, contribute to Frack! It's already much faster than Trac for what it does, and there's plenty of room for you to help. If you want to help out with Twisted, but like writing HTML or Javascript too, contribute to Frack! It's written using modern, modular JavaScript with client side templates. It uses Twisted on the backend so using stuff like websockets for updates would be pretty easy to add. Interested? Here are some things we'd like to do soon: - Add a nice front page - Add a search page - Display more info on a ticket for reviewers the code is at: http://launchpad.net/frack The current prototype is running at http://twistedmatrix.com/users/frack.twistd/ui/ticket.html?id=<ticket_id>. You can contact me directly or post on the list with any issues or questions you have.

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Re: [Twisted-Python] dynamic FTP realm
by Tom Sheffler 02 Oct '12

02 Oct '12

Hi Paul - I'm very new to twisted (I've only just started using it, so I apologise if > anything I ask is seemingly obvious!). > I'm looking to try and set up a FTP server which will serve a file > structure and files which don't exists on the server (the file structure > information is stored on cassandra, and the files are on s3). The file > structure and files will also be unique to the user, so different logins > will generate the file structure for that particular user, but I guess I > can adress that later. Here is a quick sketch of some of the steps ... but beware, I haven't debugged this. You'll want to subclass twisted.protocols.ftp.FTPShell with a new command interpreter class PaulsFTPShell(FTPShell): .... The you'll need to write a Realm that returns an instance of your FTP Shell: class PaulsFTPRealm(FTPRealm): """ @type anonymousRoot: L{twisted.python.filepath.FilePath} @ivar anonymousRoot: Root of the filesystem to which anonymous users will be granted access. """ implements(portal.IRealm) def __init__(self, ....) .... def requestAvatar(self, avatarId, mind, *interfaces): for iface in interfaces: if iface is IFTPShell: if avatarId is checkers.ANONYMOUS: avatar = None else: avatar = PaulsFTPShell( ...) return IFTPShell, avatar, getattr(avatar, 'logout', lambda: None) raise NotImplementedError("Only IFTPShell interface is supported by this realm") Then you'll stich it all together like this: f = FTPFactory() r = PaulsFTPRealm() p = Portal.Portal(r) p.registerChecker(...) f.portal = p Hope this helps get you started.

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