Mailman 3 December 2012 - Twisted

[Twisted-Python] I am new :-)
by Aniket Panse 01 Jan '13

01 Jan '13

Hello, I just wanted to introduce myself and get some help. I am familiar with Python, but I've never worked on any real project before. I wish to contribute to Twisted, and was looking for some pointers to understanding this complex code. Thanks! --Aniket

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[Twisted-Python] Weekly Bug Summary
by exarkun＠twistedmatrix.com 30 Dec '12

30 Dec '12

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[Twisted-Python] Weird SSL/TLS issue
by Jason J. W. Williams 28 Dec '12

28 Dec '12

We have an application that uses Twisted Web to listen for an API call and when it receives it, the app then connects over SMTP to the specified mail server IP and validates whether the indicated user exists. The app has been running without issue or modification for close to 2 years (uses Twisted 10.2.0). Then suddenly last night it started being unable to find the starttls() method on the Connection object when negotiating with any mail server: https://gist.github.com/4391179 We were able to replicate the problem consistently, and determine it was not a network issue. The weird part is that simply restarting the application cleared the issue and TLS SMTP connections were able to be made again. Since the Twisted modules were loaded at startup, I'm a little confused on how it suddenly decided the TLS methods were missing until we restarted. Any ideas are greatly appreciated. -J

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[Twisted-Python] Twisted 12.3.0 released
by Thomas Hervé 27 Dec '12

27 Dec '12

On behalf of Twisted Matrix Laboratories, I am pleased to announce, in extremis, the release of Twisted 12.3. 161 tickets are closed by this release, with the following highlights: * Support for local parallel testing in trial * A new "react" function to easily run a single asynchronous function in a script with the reactor. * Partial support for Python 3.3. Note that only Python 2.7 is supported on Windows now. We also require zope.interface 3.6.0 or newer. For more information, see the NEWS file here: http://twistedmatrix.com/Releases/Twisted/12.3/NEWS.txt Download it now from: http://pypi.python.org/packages/source/T/Twisted/Twisted-12.3.0.tar.bz2 or http://pypi.python.org/packages/2.7/T/Twisted/Twisted-12.3.0.win32-py2.7.msi Thanks to the supporters of Twisted via the Software Freedom Conservancy and to the many contributors for this release. -- Thomas

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[Twisted-Python] Weekly Bug Summary
by exarkun＠twistedmatrix.com 23 Dec '12

23 Dec '12

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[Twisted-Python] Second pre-release of Twisted 12.3.0
by Thomas Hervé 21 Dec '12

21 Dec '12

Hi twisteders, As it turns out, making a 4th release in 2012 wasn't going to be easy! Thanks to the testing of David Reid, we found and fixed an issue with pip which was making installation difficult when zope.interface was missing. And we got another fix with the help of Eric Mangold, fixing the compilation on OpenBSD. The tarballs of the second pre-release can be found here: http://twistedmatrix.com/~therve/12.3.0pre2/ Thank you for testing it again! -- Thomas

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[Twisted-Python] Weekly Bug Summary
by exarkun＠twistedmatrix.com 16 Dec '12

16 Dec '12

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[Twisted-Python] First pre-release of Twisted 12.3.0
by Thomas Hervé 15 Dec '12

15 Dec '12

Hello everyone, Yes, you're reading well. For the first time ever (since 2008), we're actually pushing not 2, not 3, but 4 releases in a calendar year! Just to be able to use the fancy 12.3 version number. But, apart from this nice label, this release also closes 158 tickets, among them: * Support for local parallel testing in trial * A new "react" function to easily run a single asynchronous function in a script with the reactor. * Partial support for Python 3.3. Note that only Python 2.7 is supported on Windows now. We also require zope.interface 3.6.0 or newer. You can find the tarballs of the pre-release here: http://twistedmatrix.com/~therve/12.3.0pre1/ For more information, see the NEWS file. Please download the tarballs and test them! -- Thomas

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[Twisted-Python] how to change default reactor of twisted.internet?
by Anil KARADAG 12 Dec '12

12 Dec '12

Hi all, I have a question about reactor of "twisted.internet" module. I found below; The default reactor is "select"; [root@karadag internet]# pwd /usr/lib/python2.6/site-packages/Twisted-10.0.0-py2.6-linux-x86_64.egg/t wisted/internet [root@karadag internet]# cat reactor.py # Copyright (c) 2001-2008 Twisted Matrix Laboratories. # See LICENSE for details. """ The reactor is the Twisted event loop within Twisted, the loop which drives applications using Twisted. The reactor provides APIs for networking, threading, dispatching events, and more. The default reactor is based on C{select(2)} and will be installed if this module is imported without another reactor being explicitly installed. Regardless of which reactor is installed, importing this module is the correct way to get a reference to it. New application code should prefer to pass and accept the reactor as a parameter where it is needed, rather than relying on being able to import this module to get a reference. This simplifies unit testing and may make it easier to one day support multiple reactors (as a performance enhancement), though this is not currently possible. @see: L{IReactorCore<twisted.internet.interfaces.IReactorCore>} @see: L{IReactorTime<twisted.internet.interfaces.IReactorTime>} @see: L{IReactorProcess<twisted.internet.interfaces.IReactorProcess>} @see: L{IReactorTCP<twisted.internet.interfaces.IReactorTCP>} @see: L{IReactorSSL<twisted.internet.interfaces.IReactorSSL>} @see: L{IReactorUDP<twisted.internet.interfaces.IReactorUDP>} @see: L{IReactorMulticast<twisted.internet.interfaces.IReactorMulticast>} @see: L{IReactorUNIX<twisted.internet.interfaces.IReactorUNIX>} @see: L{IReactorUNIXDatagram<twisted.internet.interfaces.IReactorUNIXDatagram> } @see: L{IReactorFDSet<twisted.internet.interfaces.IReactorFDSet>} @see: L{IReactorThreads<twisted.internet.interfaces.IReactorThreads>} @see: L{IReactorArbitrary<twisted.internet.interfaces.IReactorArbitrary>} @see: L{IReactorPluggableResolver<twisted.internet.interfaces.IReactorPluggabl eResolver>} """ import sys del sys.modules['twisted.internet.reactor'] from twisted.internet import selectreactor selectreactor.install() --------------------------------------------------------------- [root@karadag internet]# twistd --help Usage: twistd [options] Options: ... -r, --reactor= Which reactor to use (see --help-reactors for a list of possibilities) --help Display this help and exit. twistd reads a twisted.application.service.Application out of a file and runs it. Commands: ftp An FTP server. telnet A simple, telnet-based remote debugging service. socks A SOCKSv4 proxy service. manhole-old An interactive remote debugger service. portforward A simple port-forwarder. web A general-purpose web server which can serve from a filesystem or application resource. inetd An inetd(8) replacement. news A news server. wokkel-component-server An XMPP Component Server xmpp-router An XMPP Router server words A modern words server toc An AIM TOC service. dns A domain name server. mail An email service manhole An interactive remote debugger service accessible via telnet and ssh and providing syntax coloring and basic line editing functionality. conch A Conch SSH service. thanks

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[Twisted-Python] How to get the Python socket object for an TLS connection?
by Michael Schlenker 12 Dec '12

12 Dec '12

Hi, i use twisted for some volume streaming over fat pipes (10 GE) and need to tweak the rcv and send buffer sizes when streaming via socket.setsockopt(). Otherwise Twisted spends lots of time calling the producer with tiny blocksizes and writing those tiny buffers to the tiny OS buffer. Speedup for streaming was around 40x when using a large buffer instead of default block and buffer sizes, so this is really needed. I'm using Twisted 12.2. It works fine when using reactor.listenTCP(), but fails when using reactor.listenSSL() because transport.getHandle() does not return a socket object in that case (i get some SSL.Connection object instead). I already saw the TLSMemoryBIOProtocol, so there should be some way to get at the real socket object. Do i just need to skip the listenSSL() step and use the steps outlined in http://twistedmatrix.com/documents/12.2.0/api/twisted.protocols.tls.html ? import os import socket from twisted.internet import reactor from twisted.web import server, http, resource from twisted.internet.ssl import DefaultOpenSSLContextFactory port = 2000 bufsize = 4*1024*1024 class HTTPChannel(http.HTTPChannel): def connectionMade(self): sock = self.transport.getHandle() # this fails, but works when using listenTCP() sock.setsockopt(socket.SOL_SOCKET, socket.SO_RCVBUF, bufsize) def main(): keyfile = os.path.join('certs', 'server-key.pem') certfile = os.path.join('certs', 'server.pem') ctx = DefaultOpenSSLContextFactory(keyfile, certfile) site = server.Site(resource.NoResource()) site.protocol = HTTPChannel reactor.listenSSL(port, site, ctx) reactor.run() Michael -- Michael Schlenker Software Architect CONTACT Software GmbH Tel.: +49 (421) 20153-80 Wiener Straße 1-3 Fax: +49 (421) 20153-41 28359 Bremen http://www.contact.de/ E-Mail: msc(a)contact.de Sitz der Gesellschaft: Bremen Geschäftsführer: Karl Heinz Zachries, Ralf Holtgrefe Eingetragen im Handelsregister des Amtsgerichts Bremen unter HRB 13215

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