Mailman 3 June 2007 - Twisted

Re: [Twisted-Python] Have I installed twisted correctly - part II
by Simon Pickles June 8, 2007

June 8, 2007

"It looks like your version of ZopeInterface doesn't want to play nicely with your version of Twisted. Try getting the latest release of each." Jean-Paul Well, I just installed python 2.5 and latest twisted... I don't even know what zope is! I downloaded zope but that doesn't look like it will help me...... Any more ideas? Here's my error again: Traceback (most recent call last): File "<string>", line 74, in run_nodebug File "F:\_Dev\twisted server 20070608\twistedServer.py", line 5,… [View More]

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[Twisted-Python] Have I installed twisted correctly - part II
by Simon Pickles June 8, 2007

June 8, 2007

Sorry, how lazy of me! *** Python 2.5.1 (r251:54863, Apr 18 2007, 08:51:08) [MSC v.1310 32 bit (Intel)] on win32. *** >>> >>> Traceback (most recent call last): File "<string>", line 74, in run_nodebug File "F:\_Dev\twisted server 20070608\twistedServer.py", line 5, in <module> from twisted.internet import reactor File "C:\Python25\lib\site-packages\twisted\__init__.py", line 19, in <module> from zope.interface import Interface File "C:\… [View More]

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[Twisted-Python] Taking a look at pending deferToThread actions
by Allen Bierbaum June 8, 2007

June 8, 2007

I am using deferToThread in my application to put a number of web service queries into the background and then respond to them when they are complete. This is all working very well, but once in a while I seem to overload the web service with queries and I would like to track this down by checking to see how many queries are in flight and how many are still waiting to be processed. One I have put an action into the background using deferToThread, is there a way to check to see how many … [View More]

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[Twisted-Python] Have I installed twisted correctly?
by Simon Pickles June 8, 2007

June 8, 2007

Hi, I have just been recommended twisted from the python mailing lists. I thought I'd installed it, but I get an error with the first line! from twisted.internet import reactor error: TypeError: isinstance() arg 2 must be a class, type, or tuple of classes and types Can an expert help me? Simon http://www.simonpickles.com --- http://www.squirtualreality.com _________________________________________________________________ Play your part in making history - Email Britain! http://www.emailbritain.co.uk/

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[Twisted-Python] where to getPeerCertificate()
by Eli Criffield June 7, 2007

June 7, 2007

I'd like to check the CN of incoming certs for a xmlrpc server. I can't seen to find where to get the clients cert information. In the protocol.Protocol (in my case the http.HTTPCHannel) in the connectionMade() i put in a print self.transport.getPeerCertificate() but it returns a None. print self.transport.socket.get_peer_certificate() Does the same. I'm sure the client is connecting with a cert because its verifying it fine. I also have no idea where to check on client program to get the … [View More]cert info of the server I'm connecting to. Eli Criffield --example-- #!/usr/bin/env python from twisted.web import xmlrpc, server, http, resource from twisted.internet import reactor, ssl from twisted.python.log import startLogging from sys import stdout import OpenSSL class Example(xmlrpc.XMLRPC): """An example object to be published.""" def xmlrpc_add(self, a, b): """Return sum of arguments.""" return a + b class myHTTPChannel(http.HTTPChannel): def connectionMade(self): print "connection from %s"%(self.transport.getHost().host,) # HERE i get no cert print self.transport.socket.get_peer_certificate() print self.transport.getPeerCertificate() self.setTimeout(self.timeOut) class mySite(server.Site): protocol = myHTTPChannel def makeSSLContext(myKey,trustedCA): '''Returns an ssl Context Object @param myKey a pem formated key and certifcate with for my current host the other end of this connection must have the cert from the CA that signed this key @param iTrustCA a pem formated certificat from a CA you trust you will only allow connections from clients signed by this CA and you will only allow connections to a server signed by this CA ''' fd = open(myKey,'r') theCert = ssl.PrivateCertificate.loadPEM(fd.read()) fd.close() fd = open(trustedCA,'r') theCA = ssl.Certificate.loadPEM(fd.read()) fd.close() ctx = theCert.options(theCA) # The SSL protocol to use, one of SSLv23_METHOD, SSLv2_METHOD, # SSLv3_METHOD, TLSv1_METHOD. Defaults to TLSv1_METHOD. ctx.method = ssl.SSL.TLSv1_METHOD # If True, verify certificates received from the peer and fail # the handshake if verification fails. Otherwise, allow anonymous # sessions and sessions with certificates which fail validation. ctx.verify = True # Depth in certificate chain down to which to verify. ctx.verifyDepth = 1 # If True, do not allow anonymous sessions. ctx.requireCertification = True # If True, do not re-verify the certificate on session resumption. ctx.verifyOnce = True # If True, generate a new key whenever ephemeral DH parameters are used # to prevent small subgroup attacks. ctx.enableSingleUseKeys = True # If True, set a session ID on each context. This allows a shortened # handshake to be used when a known client reconnects. ctx.enableSessions = True # If True, enable various non-spec protocol fixes for broken # SSL implementations. ctx.fixBrokenPeers = False return ctx if __name__ == '__main__': r = Example() ctx = makeSSLContext('server.pem','cacert.pem') reactor.listenSSL(7080,mySite(r),ctx) startLogging(stdout) reactor.run() [View Less]

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[Twisted-Python] Deterministic "program counter" for asynchronious events
by Martin Geisler June 7, 2007

June 7, 2007

Hello, I'm writing a runtime system for doing secure multiparty computation, and here I have used deferreds with great success. All players run the same program (but with different input) and each player communicate with other players as needed to share intermediate results. These results need to be associated with the right operation and for this I use a program counter. This minimal example shows my solution without network traffic: import sys From twisted.internet.defer import Deferred, … [View More]

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[Twisted-Python] Please help me with process spawning
by Alexey Maksimov June 7, 2007

June 7, 2007

Hi, Please help me with the following: I want to write a simple app that should remotely control long running shell process. I have a C++ program that does some network capturing I need. I want to create a simple web interface that can start and stop this program via shell on linux. I already wrote a web part of this but failed to spawn my process. I think my problem is that I want to use myserver.tac and don't want directly call reactor.run() as shown in documentation. How can I spawn my … [View More]

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[Twisted-Python] Problem with trial using the reactor
by Alex Lang June 7, 2007

June 7, 2007

Hello, Here is a problem regarding the distributed trial test runner. The slave instances receive data from the master, telling them which tests to run. This requires use of the reactor on the slave-side. Unfortunately, when the testCase does the cleanup of the reactor, it cleans up everything including the trial slave. Any ideas on what should be done about this? Thank you, Alex

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[Twisted-Python] Twisted TCP Server Maximum Simultaneous Connections
by Alvin Delagon June 7, 2007

June 7, 2007

First of all, I want to send my gratitude to the people who developed Twisted. ^_^ We have this XMPP server that is implemented using twisted (using the epoll reactor). I was tasked to know how many simultaneous connections it can handle. So I wrote an XMPP benchmark tool using twisted that spawns multiple clients. When we used the benchmark tool on two PCs (each spawning 20,000 XMPP clients), the number of successful connect/authorize varies between 37,000~39,000. Adding more clients we get … [View More]

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[Twisted-Python] udp
by Bruce Coram June 6, 2007

June 6, 2007

I know the answer to this will be soo simple but is it necessary to use makeConnection when using udp. I understood that udp is a connectionless protocol. I have used TCP and factories to pass data between a server and clients and I wanted to use udp to send 'management' data on an ad hoc basis. Here is the code for a very simple client but I'm clearly missing the point. 'from twisted.internet.protocol import DatagramProtocol from twisted.internet import reactor host = '127.0.0.1' … [View More]

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[Twisted-Python] Weekly Bug Summary
by exarkun＠twistedmatrix.com June 3, 2007

June 3, 2007

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[Twisted-Python] Distributed Trial Test Runner
by Alex Lang June 2, 2007

June 2, 2007

Hello, For my Summer of Code project, I am implementing a distributed trial test runner (http://code.google.com/soc/psf/appinfo.html?csaid=770D0FCD95DAFF9E). The following is basically what needs to be done to get distributed trial working, given a master machine and slaves: 1. Transfer the relevant code to all slave machines. (with conch) 2. Do test loading at least on the master (possibly on each of the slaves as well) 3. Find a good test-to-unique-id mapping (probably using FQPNs + … [View More]

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