Mailman 3 February 2012 - Twisted

[Twisted-Python] Use epoll reactor in pypy
by Аркадий Левин 17 Feb '12

17 Feb '12

Hi all, how install twisted with epoll reactor on pypy? OS Debian 6.0 Ex: Python 2.7.1 (7773f8fc4223, Nov 18 2011, 18:47:11) [PyPy 1.7.0 with GCC 4.4.3] on linux2 Type "help", "copyright", "credits" or "license" for more information. And now for something completely different: ``in theory there is the Loop, in practice there are bridges'' >>>> from twisted.internet import epollreactor Traceback (most recent call last): File "<console>", line 1, in <module> File "/usr/src/pypy-1.7/site-packages/Twisted-11.1.0_r33452-py2.7-linux-x86_64.egg/twisted/internet/epollreactor.py", line 20, in <module> from twisted.python import log, _epoll ImportError: cannot import name '_epoll' >>>>

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[Twisted-Python] post aluminum donors
by Roger Pack 15 Feb '12

15 Feb '12

Might be nice to post some "side page" for the aluminum level donors, as well (not the main page, obviously). Cheers! -r

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[Twisted-Python] installing pyOpenSSL on Centos6 help
by Tom Sheffler 14 Feb '12

14 Feb '12

After performing a straight-forward install of pyOpenSSL I am getting the following strange import error. Suggestions appreciated! # python Python 2.6.6 (r266:84292, Dec 7 2011, 20:38:36) [GCC 4.4.6 20110731 (Red Hat 4.4.6-3)] on linux2 Type "help", "copyright", "credits" or "license" for more information. >>> import OpenSSL Traceback (most recent call last): File "<stdin>", line 1, in <module> File "OpenSSL/__init__.py", line 40, in <module> from OpenSSL import crypto ImportError: cannot import name crypto Regards, Tom

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[Twisted-Python] Have you had problems registering with twistedmatrix.com? It may be fixed now
by Itamar Turner-Trauring 13 Feb '12

13 Feb '12

Please try it out and let me know if you can receive registration emails now. -Itamar

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[Twisted-Python] libusb-1 file descriptors
by Donal McMullan 12 Feb '12

12 Feb '12

I'm trying to integrate Twisted with libusb-1 The libusb-1 Python wrapper offers a USBPoller class to "allow integration of USB event polling in a file-descriptor monitoring event loop." The class expects to receive a 'poller' object, again quoting from the documentation: poller is a polling instance implementing the following methods: - register(fd, event_flags) event_flags have the same meaning as in poll API (POLLIN & POLLOUT) - unregister(fd) - poll(timeout) timeout being a float in seconds, or None if there is no timeout. It must return a list of (descriptor, event) pairs. Note: USBPoller is itself a valid poller. I feel like it should be obvious, but I can't see what would be the correct way to integrate this with Twisted. My particular application is to enable networking over the ANT+ protocol via a small USB key. My approach is that I'm trying to write a transport. When that's working I can start to build a Protocol. Is that sound? Any pointers would be welcome. The USBPoller class can be viewed here: https://github.com/vpelletier/python-libusb1/blob/master/usb1.py Thanks Dónal

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[Twisted-Python] Weekly Bug Summary
by exarkun＠twistedmatrix.com 11 Feb '12

11 Feb '12

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[Twisted-Python] how to ensure writes to stdout via stdio.StandardIO are completed before we shutdown the reactor?
by Benjamin Rutt 11 Feb '12

11 Feb '12

Hi twisted community, What’s the best way to ensure writes to stdout via stdio.StandardIO are completed before we shutdown the reactor? The use case is to emit an error message before we shutdown the reactor and stop our program. Dummy code snippet: -------------------------------------------- #!/usr/bin/python from twisted.internet import reactor, stdio from twisted.protocols.basic import LineReceiver class StdinInteractor(LineReceiver): delimiter = '\n' def go(): stdio_proto = StdinInteractor() stdio.StandardIO(stdio_proto) stdio_proto.transport.write('did we get this message?\n') if 0: reactor.stop() else: reactor.callLater(1.0, reactor.stop) reactor.callWhenRunning(go) reactor.run() -------------------------------------------- If I change ‘if 0’ to ‘if 1’, I don’t get the message on stdout. The ‘reactor.callLater(1.0, reactor.stop)’ is obviously a hack to let the reactor send out the buffered message before shutting down. Any ideas? Thanks, -- Benjamin Rutt

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[Twisted-Python] Twisted 12.0.0 released
by Thomas Hervé 11 Feb '12

11 Feb '12

On behalf of Twisted Matrix Laboratories, I am honored to announce the release of Twisted 12.0. 47 tickets are closed by this release, among them: * A fix to the GTK2 reactor preventing unnecessary wake-ups * Preliminary support of IPV6 on the server side * Several fixes to the new protocol-based TLS implementation * Improved core documentation's main page Twisted no longer supports Python 2.4, the latest supported version is 2.5. For more information, see the NEWS file here: http://twistedmatrix.com/Releases/Twisted/12.0/NEWS.txt Download it now from: http://pypi.python.org/packages/source/T/Twisted/Twisted-12.0.0.tar.bz2 or http://pypi.python.org/packages/2.5/T/Twisted/Twisted-12.0.0.win32-py2.5.msi or http://pypi.python.org/packages/2.6/T/Twisted/Twisted-12.0.0.win32-py2.6.msi or http://pypi.python.org/packages/2.7/T/Twisted/Twisted-12.0.0.win32-py2.7.msi Thanks to the supporters of the Twisted Software Foundation and to the many contributors for this release. -- Thomas

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[Twisted-Python] pushing out same message on 100k TCPs
by Tobias Oberstein 11 Feb '12

11 Feb '12

Hi there, what is the most efficient/performant way of doing the following? I have a short message prepared .. say a string of 100 octets. I want to push out that _same_ string on 100k connected TCPs (on a server). == My thinking was: ideally, the 100 bytes would be transferred to kernel/NIC space just _once_, and then the kernel is only told to resend that buffer on the 100k connected TCPs. Does that make sense, is that even possible, with Twisted, or in general? == Currently I do the naive thing: transport.write(msg) x 100k times .. which I guess involves quite some copying around and user to kernel space transitions .. \Tobias

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[Twisted-Python] I'm working on a SPDY implementation
by Myers Carpenter 11 Feb '12

11 Feb '12

I'm working on a SPDY protocol implementation for Twisted. I've been keeping a hacking log here: http://icepick.info/2012/02/10/txspdy-day-3-pyopenssl-done-now-python-code/ So far I've gotten the NPN methods added to pyopenssl, and I'm now working on a protocol that parses the frames. At the end of this project I hope to have a way to make a https + spdy Site that serves up the same content for both protocols.

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