Mailman 3 November 2013 - Twisted

[Twisted-Python] Buildbot downtime
by Tom Prince 04 Mar '22

04 Mar '22

I am plannig to upgrade twisted's buildbot in the near future. In preperation for that, I am going to take down the production buildbot on Tuesday, June 26, around 1600 UTC[1]. During that time, the result of any builds done will be lost. Thus, I'd ask that people avoid committing to trunk during that time. I will send a reminder before I take down the buildbot both here, and on #twisted and #twisted-dev. Tom [1] http://timeanddate.com/worldclock/meetingtime.html?iso=20120626&p1=80&p2=22…

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[Twisted-Python] Twisted Python 0.7.0 Prerelease Testing
by Glyph Lefkowitz 06 Aug '21

06 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] [ANN] txZMQ released
by Andrey Smirnov 21 Jul '14

21 Jul '14

Hi! I would like to announce txZMQ, ZeroMQ bindings for Twisted. txZMQ is based on pyzmq and requires recent ØMQ version (>=2.1). txZMQ uses ØMQ APIs to get file descriptor that is used to signal pending actions from ØMQ library IO thread running in separate thread. txZMQ should be usable with any Twisted reactor. ØMQ is: * The socket library that acts as a concurrency framework. * Carries messages across inproc, IPC, TCP, and multicast. * Connect N-to-N via fanout, pubsub, pipeline, request-reply. * Fast enough for clustered products and supercomputing. * Asynch I/O for scalable multicore message-passing apps. Bridging ØMQ and Twisted makes a nice match: fast simple messaging between Twisted instances solving complex problems :) Links: * PyPi: http://pypi.python.org/pypi/txZMQ/ * Source code: https://github.com/smira/pyzmq * pyzmq: http://pypi.python.org/pypi/pyzmq * ØMQ: http://www.zeromq.org/ -- Andrey Smirnov, Qik Web Team Lead

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[Twisted-Python] Do Viewables absolutely have to be return'ed by Avatars?
by Daniel Sank 09 Dec '13

09 Dec '13

>From some experimentation I find that the only way to make a Viewable get a meaningful perspective argument when executing view_* methods is to make sure that the references to that Viewable are given to clients as return values from perspective_* methods called on a pb.Avatar. In particular, if the Avatar gives a client a reference to a Viewable by passing it as an argument to a remote_* method on the client, subsequent invocations of view_* methods by the client result in perspective argument in view_* methods being None. I have attached a complete working example of a client and server that succinctly illustrates this issue. Question: Is there a way to distribute un-asked for references to Viewables that properly get the perspective argument in their view_* methods? Sincerely, Daniel Sank

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[Twisted-Python] Unpersistable instead of pb.Avatar
by Daniel Sank 01 Dec '13

01 Dec '13

If I try to instance a pb.Avatar subclass and send it to a peer manually, the object that the peer receives is an Unpersistable instead of a real remote reference to the pb.Avatar. How do I fix this and actually send out new perspectives to users? Here's why I want to do this: Suppose I have a network chess program using perspective broker. When a user process logs in it receives a remote reference to a perspective, which is an instance of a pb.Avatar subclass. Suppose that perspective manages the user's ability to interact with a game lobby. For example, the perspective may implement perspective_joinGame allowing the user to partake in a game of chess. This part I know how to do using the cred system. Now suppose the user wants to join multiple games of chess simultaneously. It doesn't make sense to use the same perspective in both games because then every time the user wanted to announce intended action we'd have to constantly pass around extra objects to keep track of which game that perspective is trying to interact with. A similar problem occurs if the same user wants to play as both players in a single game. In other words, it would be nice to separate the responsibilities of the user from those of the "player." If I'm not thinking about this correctly please advise. Thank you for your time, Daniel Sank

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[Twisted-Python] IMAP4 Proxy to add headers and modify body of an incoming message
by Krzysztof Oblucki 29 Nov '13

29 Nov '13

Hello, I am trying to write an IMAP proxy to modify headers and the body of an incoming message using twisted. I am new to python and twisted so maybe this is why I either picked the wrong route or don't have the skills to get through some issues and I'm hoping that some you fine list members can point me in the right direction. I started by using the IMAP4Client and IMAP4Server to do the proxying. However, I realized that in certain cases, the IMAP4Server requires synchronous results but since I need to do an async call using the client the handling is not working properly. I ran into this when implementing getFlags() in the IMessage and I am not sure how I can get out of this short of changing the IMAP4Server code to handle Deferreds. Am I on the right track? Is imap4 lib the right tool for this job? If so, is modifying IMAP4Server to handle Deferreds the right thing to do? If not, what would you recommend?

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[Twisted-Python] Could Service.startService return a Deferred?
by Peter Westlake 28 Nov '13

28 Nov '13

I have a Twisted application with several Services. One of them has a startService method that does some setup asynchronously. This can go wrong if the next service to start makes a call to the first one, and it isn't ready yet. One way round it would be to make all methods on the slow service returned a Deferred (e.g. "self.slow_init.addCallback(self.actual_method)", but it seems a shame to have to do that every time when the situation only occurs when the daemon starts up. So would it be possible for t.a.s.Service.startService to be allowed to return a Deferred? Then the next service would only be started up when the Deferred fired. Peter.

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[Twisted-Python] EDNS(0) and DNSSEC support in Twisted Names
by Richard Wall 28 Nov '13

28 Nov '13

Hello, I'm happy to announce that I've won some funding from The NLnet Foundation DNS Security Fund (http://www.nlnet.nl/dnssec/), to add EDNS(0) and DNSSEC (and possibly DANE) support to Twisted. The current project plan can be found here: * https://twistedmatrix.com/trac/wiki/EDNS0 If there are any DNS enthusiasts / experts on this list, I'd appreciate your feedback -- on the plan and on the implementation (as it evolves). Please reply to this email with your thoughts. Tom Prince has kindly agreed to do some "express" code and design reviews for me. That'll be a great help given the current length of the review queue. * https://twistedmatrix.com/trac/report/25 But the more eyes on the code the better, so please consider helping out with code reviews if you can. (I'm happy to trade reviews if you've got your own branch / patch waiting to be reviewed.) I've been given a head start in this project by the patches contributed by Bob Novas and Phil Mayers, so thank you both. I hope you'll be able monitor what I'm doing and steer me in the right direction. Thanks also to Itamar who encouraged me to apply for the funding and to Tom Prince and everyone who helped me draft the proposal. I'll be working on this at the Twisted Sprint in Bristol, UK on December 7th; where I'll be delighted to discuss the project and demonstrate what I've been up to. Hope to see you there! -Richard Wall (rwall in #twisted and #twisted-dev)

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[Twisted-Python] Why must RemoteCacheObservers be hashable?
by Daniel Sank 27 Nov '13

27 Nov '13

I just wrote up a class that allows dicts to be be pb.Cacheable. Everything works hunky-dory but only if I implement __hash__, which is problematic for mutable objects for reasons explained thoroughly elsewhere. The problem comes from twisted.spread.flavors.RemoteCacheObserver: class RemoteCacheObserver: ... def __hash__(self): """Generate a hash unique to all L{RemoteCacheObserver}s for this broker/perspective/cached triplet """ return ( (hash(self.broker) % 2**10) + (hash(self.perspective) % 2**10) + (hash(self.cached) % 2**10)) As we can see, self.cached (which is the pb.Cacheable instance) must be hashable. Why?

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