Mailman 3 August 2012 - Twisted

[Twisted-Python] Twisted 12.2.0pre1 is here!
by Ashwini Oruganti 27 Aug '12

27 Aug '12

The pre-release for the upcoming Twisted 12.2 is now available! You can download the tarballs here: http://twistedmatrix.com/~ashfall/12.2.0pre1/ Highlights for this release include: * To be able to work on Python3 support, Python 2.5 is no longer supported. * twisted.mail.imap4 now serves BODYSTRUCTURE responses which provide more information and conform to the IMAP4 RFC more closely. * twisted.conch now supports commercial SSH implementations which don't comply with the IETF standard. * twisted.internet.endpoints now provides several new endpoints, including a TCP client endpoint that resolves hostnames to IPv6 host addresses. * IReactorSocket.adoptStreamConnection, implemented by some reactors, allows adding an existing established connection to the reactor. For the complete list, see the NEWS file. Note that starting with the next release after 12.2, Twisted will begin requiring zope.interface 3.6 (as part of Python3 support). Please download the tarballs and test them rigorously, so we can have a great release! Thanks! -- Ashwini Oruganti (ashfall)

3 2

[Twisted-Python] Weekly Bug Summary
by exarkun＠twistedmatrix.com 26 Aug '12

26 Aug '12

1 0

[Twisted-Python] Twisted IPv6 + SSL - fixed, or todo?
by Erik Forsberg 24 Aug '12

24 Aug '12

Hi! http://twistedmatrix.com/trac/wiki/IPv6 mentions: "SSL (but this might be automatic when IReactorTCP supports it)" IReactorTCP now has IPv6 support, so did twisted get SSL + IPv6 support automatically? It seems to me from twisted.internet.endpoints that there's work to do there (there's SSL4ServerEndpoint and SSL4ClientEndpoint, but no SSL6ServerEndpoint/SSL6ClientEndpoint). My use case is to be able to connect to https servers over IPv6 with twisted.web.client.Agent. Can I do that? If so, how? Regards, \EF

2 1

[Twisted-Python] twisted.cred documentation bug?
by Matthew Pounsett 22 Aug '12

22 Aug '12

I've been reading the cred docs, and think I may have spotted a typo. Near the end of <http://twistedmatrix.com/documents/current/core/howto/cred.html>, in the code sample describing creating a cred plugin's factory, there is this method: # This will be called once per command-line. def generateChecker(self, argstring=""): argdict = dict((x.split('=') for x in argstring.split(':'))) return SpecialChecker(**dict) I think that return should actually be for **argdict, yes?

2 2

[Twisted-Python] transport.getPeerCertificate in connectionMade
by Phil Mayers 21 Aug '12

21 Aug '12

All, It's been my observation that this code: class MyProto(protocol.Protocol): def connectionMade(self): print self.transport.getPeerCertificate() self.transport.loseConnection() class MyFactory(protocol.ClientFactory): def buildProtocol(self, addr): return MyProto() def main(): factory = MyFactory() ctxfact = ssl.ClientContextFactory() reactor.connectSSL(host, port, factory, ctxfact) reactor.run() ...will print "None". It seems that connectSSL calls connectionMade at TCP connection time, not when SSL has completed. This seems unintuitive to me because I've called "connectSSL" not "connectTCP", but I guess may be hard to fix given the way the code works? At the very least, should this be documented? Or could we have an interface e.g. class ISSLProtocol(interface): def sslReady(): """called when the SSL layer is ready""" ...and people who are interested can "implements()" it to get the callback?

2 3

[Twisted-Python] To those who are about to sprint
by Itamar Turner-Trauring 20 Aug '12

20 Aug '12

Last sprint the buildbot got overwhelmed with a giant backlog of runs and became essentially useless for the duration of the sprint. Jean-Paul had two suggestions: 1. Don't commit to trunk during the sprint, even if your branch was approved; wait until the sprint is over so trunk commits are spread out. 2. If you're just doing some initial cross-platform testing using force-builds.py, use the command line option that lets you run only some of the tests (e.g. "twisted.web" or "twisted.python.test.test_versions") instead of running the whole test suite. -- Itamar Turner-Trauring, Future Foundries LLC http://futurefoundries.com/ — Twisted consulting, training and support.

3 4

[Twisted-Python] Weekly Bug Summary
by exarkun＠twistedmatrix.com 19 Aug '12

19 Aug '12

1 0

[Twisted-Python] Running and supervising twistd daemons
by Laurens Van Houtven 18 Aug '12

18 Aug '12

Hi, What's the nicest way to run and supervise a twistd daemon? I hear good things about systemd, but I can't figure out if it's PR or actual awesome new tech. It's not impossible to get on Debian, but certainly not the default (and IIUC not even in stable yet). While I understand how it's great for desktops, I'm trying to run a server. I don't really see how faster boot-up or socket-based activation really helps me there, certainly not up to the point where it warrants the apparent extra complexity. I'm perfectly happy just throwing supervisord or daemontools at it, but I'm just trying to see if there's better tools that I've missed. cheers lvh

2 1

[Twisted-Python] How to deal with deferreds across several layers of namespaces?
by Idlecore 18 Aug '12

18 Aug '12

I have a protocol that calls code that spans several namespaces. At any of these namespaces there might be a deferred waiting to be called. The protocol can be disconnected at any time and I currently don't have a clean way to cancel all the potential deferreds from within the protocol. Will the protocol stick around long enough after disconnection for the deferreds to eventually be called? Should I create a central deferred list, at the cost of having to access it through several layers of namespaces on other parts of my project? Is there a simple way of doing this? Regards, Pedro Azevedo

2 1

[Twisted-Python] Using StandardIO and pipes.
by Maxim Lacrima 15 Aug '12

15 Aug '12

Hello! I am very new to Twisted and I have some problems using stdin.StandardIO. Here is the code: # item.py file from twisted.internet import reactor, stdio from twisted.protocols import basic from storage import Item class EchoItemProtocol(basic.LineReceiver): delimiter = '\n' def lineReceived(self, item_id): # Item.get returns a deferred d = Item.get(item_id) def writeResponse(item): self.transport.write(str(item) + '\n') d.addCallback(writeResponse) def main(): stdio.StandardIO(EchoItemProtocol()) reactor.run() if __name__ == '__main__': main() So, when I run the file it works: $ ./item.py test_item_id <storage.Item object at 0x2b15910> I want to be able to redirect output of some process into my script. But this doesn't work: $ echo test_item_id | ./item.py It doesn't produce any output. But if i replace `self.transport.write(str(item) + '\n')` with just `print str(item)` it suddenly works: $ echo test_item_id | ./item.py <storage.Item object at 0x18ac650> So my conclusions are: 1. When I write to stdin of my script from keyboard then `self.transport.write()` works as expected. 2. When I use pipes or redirection to my script `self.transport.write()` doesn't produce any output. 3. If I replace self.transport.write() with print statements it works. Why is this strange behavior? -- with regards, Maxim

6 9