Twisted October 2013

twisted@python.org

38 participants
45 discussions

[Twisted-Python] Twisted Python 0.7.0 Prerelease Testing

by Glyph Lefkowitz

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/

5 months, 2 weeks

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2 years, 8 months

[Twisted-Python] [ANN] txZMQ released

by Andrey Smirnov

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

7 years, 6 months

[Twisted-Python] txThings - simple library for CoAP protocol

by Maciej Wasilak

Hello everyone, I would like to announce the first release of txThings. It is a simple library for Constrained Application Protocol (CoAP). CoAP is a relatively new protocol designed for "Internet of Things" and M2M communications. txThings currently implements a subset of CoAP features: - standard messaging based on draft-ietf-core-coap-13 (no proxying support yet) - blockwise transfers based on draft-ietf-core-block-12 - limited suport for RFC6690 Core Link Format (for servers only) I hope to add new features like Observe (draft-ietf-core-observe-09) soon. TxThings is my first Twisted project, so the code quality can probably be improved, also better unit testing is necessary. However I decided to release the code in its current form to discover, if there is any interest in it. Internet of Things is currently very interesting field of development. It is approaching a phase where many opportunities for both large and small players. I think Twisted is well suited for development of IoT apps: - it's stable - it's Python based and portable - it has good support for UDP and TCP, which makes it ideal for proxying IoT protocols to HTTP In my opinion in the next three years, at least 20% of Twisted apps will be IoT related (educated guess, no hard data :) ) There are many new protocols out there designed for IoT, in my opinion CoAP and MQTT have the biggest chance of adoption. CoAP is developed by IETF, and backed by companies like ARM. You can download txThings from Github: https://github.com/siskin/txThings Description: http://sixpinetrees.blogspot.com/2013/09/txthings-good-enough-is-good-enoug… Few more remarks: - txThings works on RaspberryPi (tested) - txThings plays well with Kivy Python GUI Library http://kivy.org Kivy is new GUI library that supports Twisted, and allows building apps for Android and iOS - I've ran a few tests, and it's very promising :) Photo: http://bit.ly/1aPZ1ag Best Regards Maciej Wasilak

8 years, 1 month

[Twisted-Python] AMP Argument.toBox's proto argument is a locator, not the proto?

by Laurens Van Houtven

Hi everyone, I think I've hit one of those cases where AMP really seems to want everything (locator, receiver, sender) to be an instance of t.p.amp.AMP :-( I've written some code that tries to multiplex stream transports over AMP: https://github.com/lvh/txampext/blob/multiplexing/txampext/multiplexing.py The repo contains an example server and client, which demonstrate the issue: https://github.com/lvh/txampext/blob/multiplexing/docs/examples/multiplexin… https://github.com/lvh/txampext/blob/multiplexing/docs/examples/multiplexin… In order to do some of this multiplexing, I need access to the protocol instance inside the responder on the server side. Fortunately, I already had some code that exposed box senders (after a lot of advice from Glyph). I modified it to expose the protocol as well: https://github.com/lvh/txampext/blob/multiplexing/txampext/exposed.py#L41 However, it turns out fromBox gets called with the *responder locator* as the "proto" argument, not the actual protocol. The server has a pudb call that makes it easy (?!) to trace this down. The CommandLocator class, inside doit (a function defined in _wrapWithSerialization) passes "self" to command.parseArguments: https://twistedmatrix.com/trac/browser/trunk/twisted/protocols/amp.py#L1015 This is the part where I think the contract is broken, since parseArguments claims to want the protocol (well, it says it wants the AMP protocol, which, subclassing everything, is also all of the things, of course), but receives the responder locator. What am I doing wrong? Is this a bug? confusedly, lvh

8 years, 1 month

[Twisted-Python] Scaling Twisted Web on multicore

by Tobias Oberstein

Hi, I have done some testing of scaling Twisted Web on multicore and wanted to share: https://github.com/oberstet/scratchbox/tree/master/python/twisted/sharedsoc… For those that are running short in time or want to have a teaser first, here are the results, including comparison with Nginx: https://github.com/oberstet/scratchbox/raw/master/python/twisted/sharedsock… Personally, I think the results are quite encouraging. I'd love to hear any feedback and comments! Cheers, Tobias

8 years, 2 months

[Twisted-Python] Limiting cipher options for SSH/SFTP

by Ray Cote

I need to limit the ciphers offered for an ssh/sftp connection. class ESFTPServerForUnixConchUser(SFTPServerForUnixConchUser): """Main local proxy class for file transfer access. Many methods are overriden to support file encryption and encrypted file name mappings. """ def __init__(self, avatar): """Initialize class with avatar representing user information""" SFTPServerForUnixConchUser.__init__(self, avatar) I'm unclear as to how to restrict which ciphers to use at this level. --Ray -- Ray Cote, President Appropriate Solutions, Inc. We Build Software www.AppropriateSolutions.com 603.924.6079

8 years, 2 months

[Twisted-Python] Twisted Users on Windows XP

by HawkOwl

Hi everyone, I have raised the question of Windows XP support in Twisted earlier today in #twisted-dev. Since the Microsoft "extended support" cut-off is within six or so months, and there is continuing trouble with the XP-based buildslave, I think it would be a good idea to get a figure of how many Windows XP users there are currently using Twisted, so informed decisions can be made in regards to supporting it. If you use Twisted on Windows XP, please comment on ticket #6798 [1], so we can get an idea of the usage numbers. -hawkowl [1] https://twistedmatrix.com/trac/ticket/6798

8 years, 2 months

[Twisted-Python] Bytes vs unicode in twisted.python.logfile's python3 porting

by Laurens Van Houtven

Hi everyone, I'm working on #6749 for porting t.p.logfile to python3. I'm dealing with some test failures, which you can see from the buildbot here: http://buildbot.twistedmatrix.com/builders/python-3.3-tests/builds/1602/ste… I have pasted the relevant bit into a gist here: https://gist.github.com/lvh/7174766 I think what's happening is that LogFile.write should take native strings (since that's what log.msg takes). However, I'm opening all files in binary mode, since that's on the reviewer checklist (point 8) for the Python 3 porting plan. Should I not open the files in binary mode? cheers lvh

8 years, 2 months

[Twisted-Python] Twisted 13.2.0pre1 Testing Feedback

by HawkOwl

Hi everyone, I've yet to hear back from anyone testing the prerelease - if you're able to, please do! Especially of interest to be tested would be the new HostnameEndpoint, which tries to connect to both the IPv4 and IPv6 addresses from a DNS lookup, and uses whichever is first - it makes Glyph excited for its inclusion, so it ought to make you ;) . It also supports SSL chain certificates, which should also fix up some issues using TLS with Twisted - this would also be great for people to test, and will hopefully remove a bunch of monkeypatching in everyone's code. Unless there are problems brought to our attention, it is unlikely that the 13.2.0pre will be different from the final release - so you can also use it to run against your application's test suites, so you know you're ready for upgrading to the full release later. :) The tarballs and NEWS file are available at http://twistedmatrix.com/Releases/pre/13.2.0pre1/ . The ticket for the 13.2 release is at https://twistedmatrix.com/trac/ticket/6795 - please comment on it if you have any issues! -hawkowl

8 years, 2 months

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Twisted October 2013