Mailman 3 February 2008 - Twisted

[Twisted-Python] Please help - no module named S3
by Marc Byrd 13 Feb '08

13 Feb '08

I'm trying to use the S3 library from amazon within a twisted app. If I import S3 from the interactive console, no problem. If I import S3 from twisted python program (that works fine w/o), I get Failed to load application: No module named S3 . The S3.py and S3.pyc are in the directory from where I start twistd . Other such modules work fine... Any hints? Thanks, m On Feb 12, 2008 6:30 AM, Martin Geisler <mg(a)daimi.au.dk> wrote: > Hello, > > I am using Twisted and Trial with great success for a project where we > would like to have both a small regression test suite that should run > quickly and a larger test suite which will test the system under more > heavy load. > > My project lives in a package called viff, and so far I have created a > viff.test package which contains the tests -- no problem, the test are > picked up fine when I do 'trial viff'. > > To create a secondary test suite, do I have to create another package > at the viff level, say viff.stress_test, or is there some clever way > to organize things below viff.test? > > How to people organize such trees with many tests? > > Thanks for any inputs! > > -- > Martin Geisler > > VIFF (Virtual Ideal Functionality Framework) brings easy and efficient > SMPC (Secure Multi-Party Computation) to Python. See: http://viff.dk/. > > > _______________________________________________ > Twisted-Python mailing list > Twisted-Python(a)twistedmatrix.com > http://twistedmatrix.com/cgi-bin/mailman/listinfo/twisted-python >

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[Twisted-Python] Several Trial test suites
by Martin Geisler 13 Feb '08

13 Feb '08

Hello, I am using Twisted and Trial with great success for a project where we would like to have both a small regression test suite that should run quickly and a larger test suite which will test the system under more heavy load. My project lives in a package called viff, and so far I have created a viff.test package which contains the tests -- no problem, the test are picked up fine when I do 'trial viff'. To create a secondary test suite, do I have to create another package at the viff level, say viff.stress_test, or is there some clever way to organize things below viff.test? How to people organize such trees with many tests? Thanks for any inputs! -- Martin Geisler VIFF (Virtual Ideal Functionality Framework) brings easy and efficient SMPC (Secure Multi-Party Computation) to Python. See: http://viff.dk/.

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[Twisted-Python] using conch to create a "chrooted" sftp server
by glyph＠divmod.com 12 Feb '08

12 Feb '08

I'd like to provide file-server access on my home network to a machine which hosts a variety of media, without exposing its entire filesystem. OpenSSH's sftp-server doesn't allow this, so of course I thought, I should use conch. Completely replacing OpenSSH with Conch is inconvenient, however, and it is my only means to administer these machines, so both for the sake of easy packaging and making sure I don't make a mistake, I'd really like to keep the main SSH daemon in place but replace the sftp channel. I *think* that means I'd need to do something with sshd_config, twisted.conch.ssh.filetransfer, and twisted.internet.stdio. However, I'm a bit at a loss what that thing would be. Can someone with stronger conch-fu than I give a brief description of how this could be done? Ideally, I'd like some users (myself) to be able to access the entire filesystem, but others (the "storage" user, who has no shell) to only be able to access /public. Finally I'd like the "guest" user to be able to access /public, but read-only, and /public/drop-box read-write. I don't mind setting up UNIX permissions to enforce that last bit.

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[Twisted-Python] ANN: PyAMF 0.1
by Thijs Triemstra | Collab 11 Feb '08

11 Feb '08

We released PyAMF 0.1, a lightweight library that allows Flash and Python applications to communicate via Adobe's ActionScript Message Format. AMF3 and RemoteObject are supported in all the implemented Remoting gateways, currently supported for Django, Twisted and WSGI. A summary of new features features and improvements in this release: - TwistedGateway now expects deferred from service functions - Added expose_request to TwistedGateway - New error handling api useful for registering custom exception classes - When a client receives a remoting error, an exception is generated - expose_request per service control vastly improved - Improved authentication per service control - uuid is no longer installed when using Python 2.5 or newer - The inheritance tree was not consulted when encoding attributes - TypedObjects didn't work with old style classes - ErrorFault now prints details Check out the download page [1], installation instructions [2] and examples [3]. Questions? First stop is the mailing list [4], but we also hang out on [5]. Cheers, - the PyAMF team [1] http://pyamf.org/wiki/Download [2] http://pyamf.org/wiki/Install [3] http://pyamf.org/wiki/Examples [4] http://pyamf.org/wiki/MailingList [5] irc://freenode.net/pyamf

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[Twisted-Python] simple tcpgate in Twisted
by Andy Leszczynski 11 Feb '08

11 Feb '08

Hi, I need to write a simple TCP/IP gate which would accept connections, reconnect to arbitrary (address,port), retransmit all data from both ends, and finally closed the connection upon either end closing it too. I was not able to find anything ready so I wrote a simple piece of the code (attached at the end along with the tcpecho used for testing purposes, for initiator side I use simply telnet). I also want to be as clean as possible from Twisted perspective. There are two problems I have encountered related to the cleanness of the solution: 1- I store self.gate_server_protocol in both GateClientProtocol(Protocol) and GateClientProtocolFactory(ClientFactory) This is an obvious redundancy, but it is not clear for me what is a relationship between a Protocol and a ClientFactory. Is it composition or aggregation, is it 1:1 or n:n. Is Factory created for each Protocol? 2 - Not sure id the relationship between GateServerProtocol and GateClientProtocol is correctly coded too. The prototype does not accumulate the data in case a connection for is GateClientProtocol not established. I will finish it of once I am confident the main structure is solid. Thx in advance for comments and sugestuions, AndyL -----------<CUT HERE>--------------- tcpgate.py ========== from twisted.internet.protocol import Protocol,ClientFactory,ServerFactory from twisted.internet import reactor class GateClientProtocol(Protocol): def __init__(self,gate_server_protocol): self.gate_server_protocol=gate_server_protocol gate_server_protocol.gate_client_protocol=self def connectionLost(self,reason): print 'GateClientProtocol.connectionLost',reason self.gate_server_protocol.transport.loseConnection() def dataReceived(self,data): self.gate_server_protocol.transport.write(data) class GateClientProtocolFactory(ClientFactory): def __init__(self,gate_server_protocol): self.gate_server_protocol=gate_server_protocol def buildProtocol(self,addr): print 'GateClientProtocolFactory:buildProtocol' return GateClientProtocol(self.gate_server_protocol) def clientConnectionFailed(self,connector,reason): print 'GateClientProtocolFactory:clientConnectionFailed',reason class GateServerProtocol(Protocol): def __init__(self): self.gate_client_protocol=None def connectionMade(self): print 'GateServerProtocol.connectionMade' reactor.connectTCP('127.0.0.1',8002,GateClientProtocolFactory(self)) def connectionLost(self,reason): print 'GateServerProtocol.connectionLost',reason if self.gate_client_protocol: self.gate_client_protocol.transport.loseConnection() self.gate_client_protocol=None def dataReceived(self,data): if self.gate_client_protocol: self.gate_client_protocol.transport.write(data) factory=ServerFactory() factory.protocol=GateServerProtocol reactor.listenTCP(8001,factory) reactor.run() tcpecho.py ========== from twisted.internet.protocol import Protocol,Factory from twisted.internet import reactor class Echo(Protocol): def connectionLost(self, reason): print 'Lost connection. Reason:', reason def dataReceived(self, data): print 'Echo:',`data` if 'quit' in data: self.transport.loseConnection() else: self.transport.write(data) factory=Factory() factory.protocol=Echo reactor.listenTCP(8002,factory) reactor.run()

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[Twisted-Python] Re: [Twisted-commits] r22475 - Fix twisted.spread.util.FilePager to make it works with empty files:
by Jean-Paul Calderone 10 Feb '08

10 Feb '08

On Sat, 09 Feb 2008 13:03:02 -0700, Thomas Herve <therve(a)wolfwood.twistedmatrix.com> wrote: >Author: therve >Date: Sat Feb 9 13:03:00 2008 >New Revision: 22475 > >Modified: > trunk/twisted/spread/util.py > trunk/twisted/test/test_pb.py > >Log: >Fix twisted.spread.util.FilePager to make it works with empty files: >previously, it didn't callback correctly. > >Author: zectbumo >Reviewer: therve >Fixes: #3023 > > [snip] >+ while not l and ttl > 0: >+ pump.pump() >+ ttl -= 1 >+ print ttl *cough* ;) > [snip] Jean-Paul

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[Twisted-Python] Weekly Bug Summary
by exarkun＠twistedmatrix.com 10 Feb '08

10 Feb '08

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[Twisted-Python] [ANN] Twisted joins Software Freedom Conservancy, Now Accepting Tax-Deductable Donations
by glyph＠divmod.com 07 Feb '08

07 Feb '08

A little less than a year ago, we were approached by Erik Dahl of Zenoss about creating a legal entity which Zenoss (and hopefully others!) could use to donate to Twisted. Accepting money in some official capacity would allow us to finance things like sprints, releases, maintenance work, dedicated reviewer time, as well as offsetting the ongoing costs to the founders of the project such as hosting and domain registration. It's been a long, hard road to get there, but the Twisted project has finally, very recently joined the Software Freedom Conservancy. So recently, in fact, that we won't be on the web page - http://conservancy.softwarefreedom.org/ - for another day or two. Creating a full-fledged foundation can be a pretty serious hassle, and Twisted has historically been strapped for qualified personnel. The Conservancy has allowed us to pool legal resources with other projects, such as Inkscape, Samba, and Wine, to reduce the management overhead associated with creating an official legal entity. Some of you may have noticed that we recently added a Google Checkout link to the front page of twistedmatrix.com. This new link points to Conservancy's account for us, which is a tax-exempt 501(c)(3) organization. As a result, donations to Twisted are now tax-deductable. In the coming weeks, we plan to announce our first group of donors, as well as different levels of sponsorship, allowing future organizations and individuals to be recognized for their contributions. We also plan to create a mailing list for sponsors above a certain level to direct our attention to the issues which are important to them. If your company would like to be mentioned in that initial announcement, please drop us a line at tsf(a)twistedmatrix.com, and we would be happy to discuss our plans for sponsorship levels with you. We also plan to have a level of sponsorship for individuals who just want to chip in a little, but those of you who donate before we make the official announcement will get an honorable mention of some kind. (Given that we still have to figure this stuff out, I don't know *what* kind, but we'll do something.) This is all thanks to the tireless efforts of Itamar Shtull-Trauring, and Karen Sandler from the Conservancy.

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[Twisted-Python] Twisted and Centos5 install problems
by Doug Farrell 05 Feb '08

05 Feb '08

Hello everyone, I'm trying to install Twisted 2.5 on a Centos 5 intel based server that has Python 2.4 on it, and am having problems. I download the Twisted 2.5 tar file, unpack it, go to the zope.interface directory and perform a "sudo python setup.py install" command, which succeeds. I then go to the root directory and do the same thing for Twisted "sudo python setup.py install" and it looks like it completes successfully. When I go into the Python interpreter and enter an "import twisted" line, that works fine. However, if I do this, "from twisted import web" I get an error: Python 2.4.3 (#1, Mar 14 2007, 19:01:42) [GCC 4.1.1 20070105 (Red Hat 4.1.1-52)] on linux2 Type "help", "copyright", "credits" or "license" for more information. >>> from twisted import web Traceback (most recent call last): File "<stdin>", line 1, in ? ImportError: cannot import name web When I look in /usr/lib/python2.4/site-packages/twisted I see that it has a web directory, so I'm not sure what's going on or what the problem is. Any insights would be most welcome! Thanks, Doug Farrell

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[Twisted-Python] wired problem with deferreds
by markus espenhain 05 Feb '08

05 Feb '08

hi im stuck with the following deferred construct - the problem is that cb2 is called with None instead of the expected argument from twisted.internet import defer cd = None def req1(): return defer.Deferred().addCallback(req2) def req2(a): print 'req2', a global cd if not cd: cd = defer.Deferred().addCallback(req3) return cd def req3(a): print 'req3', a return a def cb1(a): print 'cb1', a return a def cb2(a): print 'cb2', a return a d1 = req1().addCallback(cb1) d1.callback('X') d2 = req1().addCallback(cb2) d2.callback('X') cd.callback('S') output: req2 X req2 X req3 S cb1 S cb2 None # <- ? req1 fetches a mapping for given arguments - req2 tries to create an object + additional resquests by the result of req1 - but these objects should only be created once - so far i didn't find an acceptable workaround for that - req3 applys some modifications but the problem occurs also without the step in req3 is there something i overlooked so that cb2 isn't called with the required arg? thanks markus

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