Mailman 3 December 2005 - Twisted

[Twisted-Python] Receiving a root from a pb client
by william.lewis＠uk.bnpparibas.com 26 Dec '05

26 Dec '05

Hi, I am using pb to communicate in a client-server configuration. My client inherits from PBClientFactory. My server has a remote_take_root() method by which the client can connect to the server and pass in its root, thus allowing two-way communication. Is there anyway for the server to re-establish the connection (should it go down) in this setup, or is this the sole responsibility of the client? Thanks William Lewis This message and any attachments (the "message") is intended solely for the addressees and is confidential. If you receive this message in error, please delete it and immediately notify the sender. Any use not in accord with its purpose, any dissemination or disclosure, either whole or partial, is prohibited except formal approval. The internet can not guarantee the integrity of this message. BNP PARIBAS (and its subsidiaries) shall (will) not therefore be liable for the message if modified. ********************************************************************************************** BNP Paribas Private Bank London Branch is authorised by CECEI & AMF and is regulated by the Financial Services Authority for the conduct of its investment business in the United Kingdom. BNP Paribas Securities Services London Branch is authorised by CECEI & AMF and is regulated by the Financial Services Authority for the conduct of its investment business in the United Kingdom. BNP Paribas Fund Services UK Limited is authorised and regulated by the Financial Services Authority

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[Twisted-Python] Custom transports
by Adam Atlas 24 Dec '05

24 Dec '05

Hello, What would I do to implement a custom transport within the Twisted framework? That is, I'd like to be able to add custom listen___ and connect___ methods to the reactor, so that existing protocols can run over a new backend transport protocol. What API would I use for this? -- Adam

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[Twisted-Python] Integrate other API that uses select
by Wolfgang Eichler 23 Dec '05

23 Dec '05

Hi, newbie question: I would like to integrate another c-api, that uses select ( for some tcp - connection ); If I could extend this c-api, to question for the bit-arry it uses for the select, could I enter this in the twisted framework to get the control, if some event for these sockets are coming in and then notifiy the c-api to handle the events on his sockets. The aim is to keep the single waiting point in twisted and not being forced to poll on the c-api. Thanks for any help ... Wolfgang

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Re: [Twisted-Python] Python 2.2 Support
by Ed Suominen 23 Dec '05

23 Dec '05

As a humble user, that makes perfect sense to me. I wonder how many people really are stuck with Python 2.2 at this point, through ignorance (not necessarily their own, but perhaps of people higher up) or otherwise. Best regards, Ed Suominen On Fri, 2005-12-23 at 07:23 -0600, twisted-python-request(a)twistedmatrix.com wrote: > I'm going to vote for dropping Python 2.2 support in Twisted trunk > now. Twisted 2.1 is a fine release to use if you want to use an > ancient version of python. Keeping compat is a pain in the ass. And > lest exarkun complain about lack of enthusiasm: I'll declare myself > quite enthusiastic about the concept. :) > > James

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[Twisted-Python] Trial and ImportErrors
by Jonathan Lange 23 Dec '05

23 Dec '05

Hello, For a while I've been thinking of changing Trial so that import errors flag the test suite as failed. This would mean the buildbot would go red if things fail to import. What do you all think? jml

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[Twisted-Python] Re: [Twisted-commits] r15363 - Merge the DAV branch to trunk.
by Jonathan Lange 23 Dec '05

23 Dec '05

On 12/22/05, Wilfredo Sanchez <wsanchez(a)wolfwood.twistedmatrix.com> wrote: > Author: wsanchez > Date: Wed Dec 21 17:28:58 2005 > New Revision: 15363 > > Added: > trunk/twisted/python/pymodules/LICENSE-pypy.txt > - copied unchanged from r15360, branches/wsanchez/dav/twisted/python/pymodules/LICENSE-pypy.txt > trunk/twisted/python/pymodules/datetime.py > - copied unchanged from r15360, branches/wsanchez/dav/twisted/python/pymodules/datetime.py > trunk/twisted/web2/dav/ > - copied from r15360, branches/wsanchez/dav/twisted/web2/dav/ <snip> twisted.web2.dav.test.util uses tempfile.mkdtemp, which is unavailable in Python 2.2. We still support Python 2.2 (ungh!).

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[Twisted-Python] python crash when running sample code from Twisted Book....
by John Case 22 Dec '05

22 Dec '05

Hello! I am working through the Twisted Network Programming Essentials book by Abe Fettig, using python24 and twisted 2.1 on a Win2k sp4 Server platform. Python crashes with a memory reference error on 'reactor.run()' when I run this code (connectiontest.py from Chap 2): Any suggestions greatly appreciated!!! **** from twisted.internet import reactor, defer, protocol class CallbackAndDisconnectProtocol(protocol.Protocol): def connectionMade(self): self.factory.deferred.callback("Connected!") self.transport.loseConnection() class ConnectionTestFactory(protocol.ClientFactory): protocol = CallbackAndDisconnectProtocol def __init__(self): self.deferred = defer.Deferred() def clientConnectionFailed(self, connector, reason): self.deferred.errback(reason) def testConnect(host, port): testFactory = ConnectionTestFactory() reactor.connectTCP(host, port, testFactory) return testFactory.deferred def handleSuccess(result, port): print "Connected to port %i" % port reactor.stop() def handleFailure(failure, port): print "Error connecting to port %i: %s" % ( port, failure.getErrorMessage()) reactor.stop() if __name__ == "__main__": import sys #if not len(sys.argv) == 3: # print "Usage: connectiontest.py host port" # sys.exit(1) host = 'localhost' port = 82 connecting = testConnect(host, port) connecting.addCallback(handleSuccess, port) connecting.addErrback(handleFailure, port) reactor.run()

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[Twisted-Python] Analog to asyncore.dispatcher.handle_write()?
by dkarbott＠comcast.net 22 Dec '05

22 Dec '05

Hi, I'm new to twisted so this may be a simple question. I want to write a twisted.internet.protocol.Protocol implementation which doesn't write too far ahead of the socket it's writing into. How do I get a notification when the underlying socket is ready to write more data? Any info would be much appreciated. -- Darrell

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[Twisted-Python] Allowing a type to be transmitted by jelly?
by Mike C. Fletcher 22 Dec '05

22 Dec '05

This is one of those problems where I've got a solution, but it *seems* like it should be something that can be done that's a little less drastic. Here's the problem: Want to expose a simple data-type (in this case a sub-class of tuple, the PySNMP OID object) to allow for transmission across pb queries and returns. Now, I've tried quite a number of iterations on this, from: jelly.globalSecurity.allowInstancesOf( oid.OID, ) through using classes like this: class PBTypeAllowingServerFactory( pb.PBServerFactory ): """Allow various types to be transported""" def buildProtocol(self, addr): """Return a Broker attached to me (as the service provider). """ broker = pb.PBServerFactory.buildProtocol( self, addr ) broker.security.allowInstancesOf( oid.OID, ) return broker class PBTypeAllowingClientFactory( pb.PBClientFactory ): def clientConnectionMade(self, broker): """Expand the types allowed to be communicated""" broker.security.allowInstancesOf( oid.OID, ) return pb.PBClientFactory.clientConnectionMade( self, broker ) but whenever I try using jelly for the encoding it complains that: Traceback (most recent call last): File "/home/mcfletch/pylive/Twisted/twisted/internet/defer.py", line 190, in addCallbacks self._runCallbacks() File "/home/mcfletch/pylive/Twisted/twisted/internet/defer.py", line 358, in _runCallbacks self.result = callback(self.result, *args, **kw) File "/home/mcfletch/pylive/cinemon/cinespread/metaperspective.py", line 216, in callWhenFree return perspective.callRemote( *args, **named ).addErrback( File "/home/mcfletch/pylive/Twisted/twisted/spread/pb.py", line 382, in callRemote _name, args, kw) --- <exception caught here> --- File "/home/mcfletch/pylive/Twisted/twisted/spread/pb.py", line 857, in _sendMessage netArgs = self.serialize(args, perspective=perspective, method=message) File "/home/mcfletch/pylive/Twisted/twisted/spread/pb.py", line 811, in serialize return jelly(object, self.security, None, self) File "/home/mcfletch/pylive/Twisted/twisted/spread/jelly.py", line 896, in jelly return _Jellier(taster, persistentStore, invoker).jelly(object) File "/home/mcfletch/pylive/Twisted/twisted/spread/jelly.py", line 480, in jelly sxp.append(self.jelly(item)) File "/home/mcfletch/pylive/Twisted/twisted/spread/jelly.py", line 476, in jelly sxp.append(self.jelly(item)) File "/home/mcfletch/pylive/Twisted/twisted/spread/jelly.py", line 511, in jelly raise InsecureJelly("Type not allowed for object: %s %s" % twisted.spread.jelly.InsecureJelly: Type not allowed for object: <class 'cinemon.snmp.oidobject.OID'> .1.3.6.1.2.1.1.4.0 to hack around it I've built my own generic (security restricted) pickle-like system, and freeze the parameters and return values before passing them across pb... which just seems *so* wrong. My system is almost as large as jelly, and is just entirely redundant code other than its allowing me to add new classes to the set allowed. Anyway, I'm sure I'm once again missing something blindingly obvious, but given that I missed the logical equivalent of turning on the power switch earlier I thought I'd ask if someone had a recipe for this type of operation. BTW, this seems like something that should be covered in the tutorial for pb, as it would seem like a common need to add a low-level object-type or two to the set allowed. Freezer-isn't-so-wonderful-I-want-to-use-it-pointlessly y'rs, Mike -- ________________________________________________ Mike C. Fletcher Designer, VR Plumber, Coder http://www.vrplumber.com http://blog.vrplumber.com

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[Twisted-Python] Twisted conch bad key signatures
by Phil Mayers 21 Dec '05

21 Dec '05

All, I've got an SSH server (Extremeware 7.3 router) which OpenSSH can SFTP into without problem but Twisted Conch reports: 2005/12/20 17:50 GMT [-] Log opened. 2005/12/20 17:50 GMT [-] Enabling Multithreading. 2005/12/20 17:50 GMT [Transport,client] kex alg, key alg: diffie-hellman-group1-sha1 ssh-dss 2005/12/20 17:50 GMT [Transport,client] client->server: 3des-cbc hmac-md5 none 2005/12/20 17:50 GMT [Transport,client] server->client: 3des-cbc hmac-md5 none 2005/12/20 17:50 GMT [Transport,client] host key fingerprint: 51:11:e1:76:89:f8:cd:af:8c:09:42:9e:37:a8:0a:36 2005/12/20 17:50 GMT [Transport,client] Disconnecting with error, code 3 reason: bad signature 2005/12/20 17:50 GMT [Transport,client] connection lost 2005/12/20 17:50 GMT [Transport,client] Stopping factory <twisted.internet.protocol._InstanceFactory instance at 0xb71b6b0c> 2005/12/20 17:50 GMT [-] Received SIGINT, shutting down. 2005/12/20 17:50 GMT [-] Main loop terminated. (cftp does the same). What debugging do I need to do to identify the cause?

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Twisted December 2005