Mailman 3 May 2014 - Twisted

[Twisted-Python] Buildbot downtime
by Tom Prince 03 Mar '22

03 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 05 Aug '21

05 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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by Tamika 01 May '19

01 May '19

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[Twisted-Python] Better usage of Twisted on multi core processor
by Sumanth Puram 13 Mar '15

13 Mar '15

Hi all, I have a twisted TCP server to listens to client, processes requests, do mysql database operations if needed (using adbapi Connection pool) and return the result. Before deploying this in production, I want to know right way to configure the server. Since twisted is single threaded, how can I leverage multiple cores of my production machine (which has 6 cores and 16 GB RAM) ? One approach that I thought of was to start multiple instances of twisted server on different ports. This would help in using the other cores as well. What do you guys suggest ? Thanks -Sumanth

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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] Status of trac upgrade
by exarkun＠twistedmatrix.com 19 Jun '14

19 Jun '14

Hello, I was just wondering what the current status of the effort to upgrade trac on twistedmatrix.com is. Thanks, Jean-Paul

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[Twisted-Python] ANN: Crochet 1.3.0 - Use Twisted Anywhere!
by Itamar Turner-Trauring 02 Jun '14

02 Jun '14

Crochet is an MIT-licensed library that makes it easier to use Twisted from regular blocking code. Some use cases include: * Easily use Twisted from a blocking framework like Django or Flask. * Write a library that provides a blocking API, but uses Twisted for its implementation. * Port blocking code to Twisted more easily, by keeping a backwards compatibility layer. * Allow normal Twisted programs that use threads to interact with Twisted more cleanly from their threaded parts. For example this can be useful when using Twisted as a WSGI container. This is a bugfix release, recommended for all users of Crochet. Crochet can be downloaded from https://pypi.python.org/pypi/crochet or by running: $ pip install crochet Documentation can be found at http://crochet.readthedocs.org <https://crochet.readthedocs.org/> Bugs and feature requests should be filed at the project https://github.com/itamarst/crochet Here’s an example of a program using Crochet. Notice that you get a completely blocking interface to Twisted and do not need to run the Twisted reactor, the event loop, yourself. #!/usr/bin/python """ Do a DNS lookup using Twisted's APIs. """ from __future__ import print_function # The Twisted code we'll be using: from twisted.names import client from crochet import setup, wait_for setup() # Crochet layer, wrapping Twisted's DNS library in a blocking call. @wait_for(timeout=5.0) def gethostbyname(name): """Lookup the IP of a given hostname. Unlike socket.gethostbyname() which can take an arbitrary amount of time to finish, this function will raise crochet.TimeoutError if more than 5 seconds elapse without an answer being received. """ d = client.lookupAddress(name) d.addCallback(lambda result: result[0][0].payload.dottedQuad()) return d if __name__ == '__main__': # Application code using the public API - notice it works in a normal # blocking manner, with no event loop visible: import sys name = sys.argv[1] ip = gethostbyname(name) print(name, "->", ip) Run on the command line: > $ python blockingdns.py twistedmatrix.com > twistedmatrix.com -> 66.35.39.66

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[Twisted-Python] tor hidden service endpoint parser returns a deferred
by David Stainton 31 May '14

31 May '14

Greetings, Today I wrote an endpoint parser for Meejah's txtorcon Tor Hidden Service endpoint. Now that we have foolscap ported to twisted endpoints (branch needs review but I should probably rebase first) we'd like to be able to simply specify an "onion" endpoint descriptor in Tahoe-LAFS configuration... that way foolscap receives the descriptor and uses serverFromString to generate the endpoint object. This will work fine for the txsocksx tor client endpoint parser I wrote... However the txtorcon Tor Hidden Service endpoint setup requires a deferred to fire once the tor process is started... This means that the endpoint parser needs to return a deferred. But this breaks the interface!... meaning that foolscap or any other api using this onion endpoint parser will have to special case the situation where serverFromString returns a deferred. Terrible! Or do you think this is not so terrible? I am curious to know your thoughts and if any of you have alternate solutions... since I am obviously doing it wrong. Here's my txtorcon onion endpoint parser: https://github.com/david415/txtorcon/blob/endpoint_parser_plugin/examples/h… And here's some example code that uses it: https://github.com/david415/txtorcon/blob/endpoint_parser_plugin/examples/l… By the way (just in case you don't know)... you can test this parser by placing it in the twisted/plugins directory... here's how I do it: cd projects/virtualenv-1.11.1/ ./virtualenv.py ~/virtenv-endpoints-test . ~/virtenv-endpoints-test/bin/activate usewithtor pip install twisted cd ~/projects git clone https://github.com/david415/txtorcon.git # defaults to my endpoint_parser_plugin branch cd txtorcon usewithtor python setup.py install cd examples # CWD is now /home/human/projects/txtorcon/examples cp hiddenservice_endpoint_parser.py /home/human/virtenv-endpoints-test/lib/python2.7/site-packages/twisted/plugins # and then run the example code that uses this endpoint parser python launch_tor_endpoint.py Cheers, David

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[Twisted-Python] deferToThread and trial
by Piper Masden 30 May '14

30 May '14

I have some Klein code that uses deferToThread for I/O. It looks something like this: @app.route('/', methods=['GET'] def index(request, *args, **kwargs): d = deferToThread(some_blocking_db_select_function) def serialize(db_object): return json.dumps({ 'id': db_object, }) d.addCallback(serialize) return d I have a test that executes this function, and the deferToThread returns a Deferred, but that deferred never fires its callback, and so when I use successResultOf expecting a success result, no result is found. When I use twistd to run the Klein application, everything works fine (the deferred fires and I get a json string in the body of the response). What's different about the trial environment that deferToThread might not fire its callback? Do I need to explicitly set up a thread pool in trial that I don't have to set up using twistd? Any help would be appreciated. -Piper

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[Twisted-Python] Auto-Re: Twisted.email.smtp Module ERROR
by 甘肃电大 29 May '14

29 May '14

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