Mailman 3 March 2013 - Twisted

[Twisted-Python] Lost slides with deferred errbacks
by anatoly techtonik 07 Mar '13

07 Mar '13

Hi, Some months ago I saw slides about how deffered work in Twisted. If I remember correctly these there two columns on yellow background, with pictures on the right, which described how errback processing propogates and how to handle deferreds. Does anybody remember them? I looks like color codes for the blocks on the diagrams were filled bright green and solid bright red square blocks. I can't find them, does anybody know where I could see them? Thanks. -- anatoly t.

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[Twisted-Python] First pre-release of Twisted 13.0.0
by Thomas Hervé 06 Mar '13

06 Mar '13

Hello fine people of Twisted, I've the pleasure to announce the first pre-release of Twisted 13.0.0. This is mostly a bugfix release, but I'd like to highlight the new "Introduction to Deferreds" document, which will hopefully help all the Deferred-confused over the world. Among the 70 tickets closed, we can see: * A fix in twisted.web.template where attributes were not quoted properly, risking HTML injection. * Support for unicode domain names in twisted.names SRVConnector and Name classes, after a 12.3 regression. * A workaround for platform limitations when trying to schedule events far in the future. You can find the tarballs of the pre-release here: http://twistedmatrix.com/~therve/13.0.0pre1/ For more information, see the NEWS file. Please download the tarballs and test them! -- Thomas

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[Twisted-Python] regression ticket stuck
by Glyph 05 Mar '13

05 Mar '13

Does the original author, or anyone else, want to deal with the trivial review feedback on this ticket and get it to trunk? It's blocking an important bugfix release; <http://twistedmatrix.com/trac/ticket/6245> -glyph

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[Twisted-Python] Epoll error after upgrading from 10.0 to 12.3
by Alec Matusis 05 Mar '13

05 Mar '13

I had 60 busy tcp servers that ran on Python 2.6/Twisted 10.0 (or Twisted 9.0) for over two years with not problems. After I upgraded to Twisted 12.3/Python 2.7, I started getting the errors below (no application code changes). It took about two days for the first error to appear on a busy server under heavy load: [twisted.internet.protocol.ServerFactory] Unhandled Error Traceback (most recent call last): File "/usr/local/encap/Python-2.7.3/lib/python2.7/site-packages/twisted/python/lo g.py", line 73, in callWithCon text return context.call({ILogContext: newCtx}, func, *args, **kw) File "/usr/local/encap/Python-2.7.3/lib/python2.7/site-packages/twisted/python/co ntext.py", line 118, in callWi thContext return self.currentContext().callWithContext(ctx, func, *args, **kw) File "/usr/local/encap/Python-2.7.3/lib/python2.7/site-packages/twisted/python/co ntext.py", line 81, in callWit hContext return func(*args,**kw) File "/usr/local/encap/Python-2.7.3/lib/python2.7/site-packages/twisted/internet/ posixbase.py", line 614, in _d oReadOrWrite why = selectable.doRead() --- <exception caught here> --- File "/usr/local/encap/Python-2.7.3/lib/python2.7/site-packages/twisted/internet/ tcp.py", line 1069, in doRead transport = self.transport(skt, protocol, addr, self, s, self.reactor) File "/usr/local/encap/Python-2.7.3/lib/python2.7/site-packages/twisted/internet/ tcp.py", line 786, in __init__ self.startReading() File "/usr/local/encap/Python-2.7.3/lib/python2.7/site-packages/twisted/internet/ abstract.py", line 429, in sta rtReading self.reactor.addReader(self) File "/usr/local/encap/Python-2.7.3/lib/python2.7/site-packages/twisted/internet/ epollreactor.py", line 256, in addReader _epoll.EPOLLIN, _epoll.EPOLLOUT) File "/usr/local/encap/Python-2.7.3/lib/python2.7/site-packages/twisted/internet/ epollreactor.py", line 240, in _add self._poller.modify(fd, flags) exceptions.IOError: [Errno 2] No such file or directory After the error occurs, the server usually locks up and does not accept new connections. One server self-recovered after these errors after 30min outage, and started accepting new connections. Apparently I am not the ony one who has enountered this: http://stackoverflow.com/questions/12600137/twisted-internet-epollreactor-py -line-238-in-add Is there a patch available, or should I roll back to 10.0.0?

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[Twisted-Python] spam comments on valid tickets
by Glyph 04 Mar '13

04 Mar '13

A minor administrative issue: We have a nice "delete ticket" interface for trac admins to delete tickets that are filed as spam. but, there are some ticket *comments* that are spam, such as on: <http://tm.tl/2424> <http://tm.tl/4173> <http://tm.tl/5697> Do any of our trac admins know how to delete the comments, and attachments, within these otherwise valid conversations? Thanks, -glyph

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[Twisted-Python] Error in documentation
by Sofiane Akermoun 03 Mar '13

03 Mar '13

Hello, It is probably cheap but i came across wrong thing in your official doc in the part : http://twistedmatrix.com/documents/current/core/howto/tutorial/library.html Here we learn how to separate the application code that launches a finger service from the library code which defines the finger service. The problem is in the "Easy Configuration" Part. Between line 7 and line 8 it misses the code f.setServiceParent(s) Without it the the instantiated object from class FingerService(service.Service) will be never collected by the service collection and the startService function in class FingerService(service.Service) will be never called. (this function is import it is where we initiate the looping reading of "/etc/users") There is also an other error at the end of this tutorial it is wrote "% twisted -ny simple-finger.tac" instead of "%twistd -ny simple-finger.tac". regards, -- Sofiane Akermoun akersof(a)gmail.com

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Re: [Twisted-Python] Need help regarding Gsoc 2013
by Saurabh Mahindre 03 Mar '13

03 Mar '13

Glyph wrote: >Would you be interested in implementing this with multiple toolkits (GTK, whatever the best thing is for Windows, and Cocoa, perhaps)? I have had some experience with Qt Framework, Pyside in particular .It integrates with QtReactor .It is also multiplatform.

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[Twisted-Python] Weekly Bug Summary
by exarkun＠twistedmatrix.com 03 Mar '13

03 Mar '13

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[Twisted-Python] How to dispatch message to different servers
by Benjamin BERTRAND 02 Mar '13

02 Mar '13

Hi, I have to replace a piece of software that sniffs the traffic on one interface. It gets different messages that are each associated to a specific emitter. On the same machine, one server is started for each emitter (on a different port). And the application is just supposed to use the proper server to send the messages captured (to a client on another machine). Not sure if it's clear, but basically if I have 2 emitters A and B, I'll start 2 servers (a and b). My sniffer will get messages A1, A2, B1, B2, B3... I have to pass messages A1, A2 to server a, that will just send them to the client (if it is connected of course). And B1, B2, B3 to server b. I don't need any buffering. If no client is connected, messages captured are just discarded. To sniff the network, I want to use pylibpcap or pcapy. I found this example to make it work with twisted: http://dound.com/2009/09/integrating-twisted-with-a-pcap-based-python-packe… Starting several servers that use the same protocol is not a problem. But how do I pass the messages captured to the right server? How do I make the link between the function sniffing the network and the servers? Thanks Benjamin

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Re: [Twisted-Python] Need help regarding Gsoc 2013
by Saurabh Mahindre 01 Mar '13

01 Mar '13

Yes, I would like to be involved in next gsoc. Twisted interests me as whole and how it eases networking whenever I worked with it. Integration with GUI loops was also very great.Having seen Twisted in action , how it works at lower level will be great thing to know more about.

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