Mailman 3 September 2012 - Twisted

[Twisted-Python] Buildbot downtime
by Tom Prince March 3, 2022

March 3, 2022

I am plannig to upgrade twisted's buildbot in the near future. In preperation for that, I am going to take down the production buildbot on Tuesday, June 26, around 1600 UTC[1]. During that time, the result of any builds done will be lost. Thus, I'd ask that people avoid committing to trunk during that time. I will send a reminder before I take down the buildbot both here, and on #twisted and #twisted-dev. Tom [1] http://timeanddate.com/worldclock/meetingtime.html?iso=20120626&p1=80&p2=22…

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[Twisted-Python] Twisted Python 0.7.0 Prerelease Testing
by Glyph Lefkowitz Aug. 5, 2021

Aug. 5, 2021

hi there, folks: I'd really like to release 0.7.0 but I would like it to be at least a little bit tested before I do so. Could those of you with CVS trees check everything out and see if it performs as advertised? Deeper bugs than that will have to wait for the next release, but I'd at least like to know if it works for someone other than me. Thanks. ______ __ __ _____ _ _ | ____ | \_/ |_____] |_____| |_____| |_____ | | | | @ t w i s t e d m a t r i x . c o m http://www.twistedmatrix.com/~glyph/

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[Twisted-Python] [ANN] txZMQ released
by Andrey Smirnov July 21, 2014

July 21, 2014

Hi! I would like to announce txZMQ, ZeroMQ bindings for Twisted. txZMQ is based on pyzmq and requires recent ØMQ version (>=2.1). txZMQ uses ØMQ APIs to get file descriptor that is used to signal pending actions from ØMQ library IO thread running in separate thread. txZMQ should be usable with any Twisted reactor. ØMQ is: * The socket library that acts as a concurrency framework. * Carries messages across inproc, IPC, TCP, and multicast. * Connect N-to-N via fanout, pubsub, pipeline, request-reply. * Fast enough for clustered products and supercomputing. * Asynch I/O for scalable multicore message-passing apps. Bridging ØMQ and Twisted makes a nice match: fast simple messaging between Twisted instances solving complex problems :) Links: * PyPi: http://pypi.python.org/pypi/txZMQ/ * Source code: https://github.com/smira/pyzmq * pyzmq: http://pypi.python.org/pypi/pyzmq * ØMQ: http://www.zeromq.org/ -- Andrey Smirnov, Qik Web Team Lead

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[Twisted-Python] regarding xml elements
by Raj kumar Oct. 2, 2013

Oct. 2, 2013

Hi, I have an xml file in my application, I have created an element using Example goes like this......... document.createElement("abc") and i appeneded it by using append() method. But how i can reflect this change to my xml file? and one more thing is i want to create element with some other parameters.... like............. <abc m=" " n=" "> </abc> and i have m and n values as strings with me. can anybody help me to create this element and write it to the existing xml file as a child of an existing element? Thanks in advance.. Raj.. Forgot the famous last words? Access your message archive online at http://in.messenger.yahoo.com/webmessengerpromo.php

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[Twisted-Python] Get IP of connecting client in XMLRPC server
by Remy C. Cool April 28, 2013

April 28, 2013

Hello, On 18 May 2004, the following message was posted to this mailinglist: Jp Calderone exarkun at divmod.com wrote: >Daniel Newton wrote: > > I have a simple XML-PRC server similar to the example below: > > from twisted.web import xmlrpc, server > > class Example(xmlrpc.XMLRPC): > """An example object to be published.""" > > def xmlrpc_add(self, a, b): > """Return sum of arguments.""" > return a + b def xmlrpc_whatIsMyAddress(self): return self.transport.getPeer().host > > if __name__ == '__main__': > from twisted.internet import reactor > r = Example() > reactor.listenTCP(7080, server.Site(r)) > reactor.run() > > I want to be able to get the address of the client that calls the xmlrpc > method can anyone help me with this? This solution didn't work because 'transport' isn't a property of the Example class. I'm currently in the process of changing from a customized SimpleXMLRPCServer to a twisted XMLRPC server solution and I need to insert the client IP into the attributes passed to the called xmlrpc method. Anyone who knows the answer and is willing to share the info? Regards, Remy

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[Twisted-Python] GSoC 2012 Project, TwistedChecker
by Raphael Shu Nov. 29, 2012

Nov. 29, 2012

Hi everyone, I'm a student of GSoC 2012, from University of Tsukuba, Japan. I'm glad to be selected as a practicer in Twisted project this year. Then in these serveral months, my project is to create a code standard checker for Twisted, Basically, I will follow "Twisted Coding Standard", it can be found at: http://twistedmatrix.com/trac/browser/trunk/doc/core/development/policy/cod… I hope finally this project could be integrated into our main ticket system, so it would automatically check patches or other things. Please let me know if you have any good advise or idea to this project. My name on IRC is zomux. ( This project is currently hosted on launchpad, http://launchpad.net/twistedchecker ) Thanks. Best Regards, -- *Raphael Shu , UACA 2012*

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Re: [Twisted-Python] dynamic FTP realm
by Tom Sheffler Oct. 1, 2012

Oct. 1, 2012

Hi Paul - I'm very new to twisted (I've only just started using it, so I apologise if > anything I ask is seemingly obvious!). > I'm looking to try and set up a FTP server which will serve a file > structure and files which don't exists on the server (the file structure > information is stored on cassandra, and the files are on s3). The file > structure and files will also be unique to the user, so different logins > will generate the file structure for that particular user, but I guess I > can adress that later. Here is a quick sketch of some of the steps ... but beware, I haven't debugged this. You'll want to subclass twisted.protocols.ftp.FTPShell with a new command interpreter class PaulsFTPShell(FTPShell): .... The you'll need to write a Realm that returns an instance of your FTP Shell: class PaulsFTPRealm(FTPRealm): """ @type anonymousRoot: L{twisted.python.filepath.FilePath} @ivar anonymousRoot: Root of the filesystem to which anonymous users will be granted access. """ implements(portal.IRealm) def __init__(self, ....) .... def requestAvatar(self, avatarId, mind, *interfaces): for iface in interfaces: if iface is IFTPShell: if avatarId is checkers.ANONYMOUS: avatar = None else: avatar = PaulsFTPShell( ...) return IFTPShell, avatar, getattr(avatar, 'logout', lambda: None) raise NotImplementedError("Only IFTPShell interface is supported by this realm") Then you'll stich it all together like this: f = FTPFactory() r = PaulsFTPRealm() p = Portal.Portal(r) p.registerChecker(...) f.portal = p Hope this helps get you started.

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[Twisted-Python] Twisted + Redis-py + Connection Pooling
by Arkadiusz Rzadkowolski Sept. 30, 2012

Sept. 30, 2012

Hello everyone I am currently working on creating a complex python script which will be using connection pooling from redis-py library (it will be working as a backport Unix Domain Socket for redis 1.4, which doesn't support unix sockets) The simplest version of my code was included in the attachment. I have a problem thought. Even if traffic is high (500+ requests per second) there are no new connections started to redis (added print to connection.py to trace it). Here's my output: 2012-09-28 23:00:31+0200 [-] Log opened. 2012-09-28 23:00:31+0200 [-] Factory starting on '/tmp/redis_test.sock' 2012-09-28 23:00:31+0200 [-] Starting factory <twisted.internet.protocol.Factory instance at 0x1fc77a0> 2012-09-28 23:00:31+0200 [RedisWorkerProtocol,0,] New connection After waiting 15 minutes, nothing more has been shown. Requests work just fine and always get a reply. I am curious though, why my code doesn't initiate more connections to redis? Could you please shed a light on this issue? Is it my code, redis-py simply doesn't need more connections, or twisted works in my code as "one connection at a time"? Really appreciate your reply. Thank you in advance and have a great weekend! -- Best regards, Arkadiusz Rz.

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[Twisted-Python] Weekly Bug Summary
by exarkun＠twistedmatrix.com Sept. 29, 2012

Sept. 29, 2012

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[Twisted-Python] MemoryError in twisted causes the program to exit, or not
by Benjamin Rutt Sept. 28, 2012

Sept. 28, 2012

Hi, I am trying to understand what will happen in my long-running twisted server program when the available memory is low. If I run the following program with increasing numeric seeds as arguments, 0, 1, 2, 3, 4, … , some of the time the out of memory condition will crash and exit the program right away (when the MemoryError is raised inside twisted core code), and other times it will just carry on with an UnhandledError (if the MemoryError is raised inside my hi() function below). Sample code: --- #!/usr/bin/env python import sys, resource, random, traceback from twisted.internet import reactor resource.setrlimit(resource.RLIMIT_AS, (180 * 1024 * 1024, resource.RLIM_INFINITY)) data = [] random.seed(int(sys.argv[1])) def hi(): data.append('x' * random.randint(1, 10000)) reactor.callLater(0, hi) def main(): reactor.callLater(0, hi) reactor.callWhenRunning(main) reactor.run() --- I am using python 2.7.1, twisted 11.0.0. Sample runs follow: bash$ n=0; while true; do echo "starting rep $n"; ./twisted-oom.py $n; n=$(($n+1)); echo; done starting rep 0 Traceback (most recent call last): File “./twisted-oom.py", line 21, in <module> reactor.run() File "/sw/external/twisted-py27-11.0.0/lib/python/twisted/internet/base.py", line 1162, in run self.mainLoop() File "/sw/external/twisted-py27-11.0.0/lib/python/twisted/internet/base.py", line 1177, in mainLoop log.err() File "/sw/external/twisted-py27-11.0.0/lib/python/twisted/python/log.py", line 197, in err _stuff = failure.Failure() MemoryError starting rep 1 Traceback (most recent call last): File ". /twisted-oom.py", line 21, in <module> reactor.run() File "/sw/external/twisted-py27-11.0.0/lib/python/twisted/internet/base.py", line 1162, in run self.mainLoop() File "/sw/external/twisted-py27-11.0.0/lib/python/twisted/internet/base.py", line 1177, in mainLoop log.err() MemoryError starting rep 2 Unhandled Error Traceback (most recent call last): File "./twisted-oom.py", line 21, in <module> reactor.run() File "/sw/external/twisted-py27-11.0.0/lib/python/twisted/internet/base.py", line 1162, in run self.mainLoop() File "/sw/external/twisted-py27-11.0.0/lib/python/twisted/internet/base.py", line 1171, in mainLoop self.runUntilCurrent() --- <exception caught here> --- File "/sw/external/twisted-py27-11.0.0/lib/python/twisted/internet/base.py", line 793, in runUntilCurrent call.func(*call.args, **call.kw) File "/home/ruttbe/dev/oneoff/twisted-oom.py", line 14, in hi data.append('x' * random.randint(1, 10000)) exceptions.MemoryError: On the first two runs, the program exited quickly, but on the last rep ("starting rep 2"), it just carried on running with the reactor still running. It would be nice if there was a way to make the out of memory behavior consistent, so I would know that it would either always carry on running with a MemoryError stack trace, or always crash out and end the program. Maybe runUntilCurrent should not catch MemoryError from user code and should let it propagate out? Also wondering if there are other different behaviors in other areas of the code (such as callbacks into user code such as dataReceived, outReceived, lineReceived, etc.). i.e. is the observed behavior (that MemoryError in user code is caught and MemoryError in twisted core is not) intentional, or an accident? Thanks, -- Benjamin Rutt

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[Twisted-Python] unhandled exception in deferred has a delayed logging ?
by Jonathan Vanasco Sept. 28, 2012

Sept. 28, 2012

while migrating some functionality to a deferred callback chain and debugging my app, i noticed this oddity... if a function doesn't have the proper args/kwargs definition, no error is raised and everything just hangs for example, if i have these 2 class functions in an internet.TimerService managed class ... def start_chain( self ): database.get_dbPool().runInteraction( self.get_update_batch )\ .addCallback( self.process_batch ) def get_update_batch(self): return True and then improperly don't have an arg to capture the return value in the callback... def process_batch( self ): pass then the reactor just seems to hang. if i kill the process, then the Unhandled Error and Traceback message prints. If i wait until the next interval that the timerservice runs, then the Unhandled Error and Traceback message will print then ( but that could be minutes/hours later ). has anyone else noticed this before ? are there any good ways around this , other than setting the timer service to be within seconds during bugtesting ?

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[Twisted-Python] dynamic FTP realm
by Paul Wiseman Sept. 27, 2012

Sept. 27, 2012

I'm very new to twisted (I've only just started using it, so I apologise if anything I ask is seemingly obvious!). I'm looking to try and set up a FTP server which will serve a file structure and files which don't exists on the server (the file structure information is stored on cassandra, and the files are on s3). The file structure and files will also be unique to the user, so different logins will generate the file structure for that particular user, but I guess I can adress that later. firstly is this possible? I imagine there will be some methods for listing folders, and listing files that I can override and in there I can make a request to get the list and return it. I found this<http://twistedmatrix.com/documents/current/core/examples/ftpserver.py> example of a ftp server but I can't seem to find out how I can override or change FTPRealm to alter how it lists files/folders. Any advice or pointers to some ftp tutorials would be hugely appreciated, Many thanks! Paul

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[Twisted-Python] Fitting cred into my application
by Matthew Pounsett Sept. 26, 2012

Sept. 26, 2012

Hi. I've been trying to wrap my head around the cred implementation for a while now, but either I'm missing something, or there's some piece of documentation that could be better. Probably at least a bit of both. My application is an XMLRPC server, and an authenticated client should have rights to run some RPC methods, but not others. Some methods will give access to limited data based on authentication. The documentation for cred is clear in the case where the server has its own protocol implementation, but in the case of XMLRPC, where the protocol isn't subclassed, how to link it in is far less clear. Also, since the design suggests that it's the RPC methods that need to talk to the avatar, not the protocol, how to implement cred seems even less obvious. Are there some other examples of cred implementations floating around that I can look at, where lack of authentication does not block all access to the protocol? In particular an example combining XMLRPC and cred would make my day. Does any documentation or example code along those lines exist that I just haven't found yet? Thanks in advance for any pointers! Matt

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[Twisted-Python] Weekly Bug Summary
by exarkun＠twistedmatrix.com Sept. 22, 2012

Sept. 22, 2012

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[Twisted-Python] Twisted Sprint in SF, 9/22 (this saturday)
by Ying Li Sept. 20, 2012

Sept. 20, 2012

Hi all! For those of you in the Bay Area, there will be a Twisted sprint this Saturday at Rackspace (620 Folsom St., between 2nd and Hawthorne) in San Francisco. Food and drink will be provided. Thanks! -Ying

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[Twisted-Python] Weekly Bug Summary
by exarkun＠twistedmatrix.com Sept. 15, 2012

Sept. 15, 2012

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Re: [Twisted-Python] interface kombu with twisted
by David Serafini Sept. 13, 2012

Sept. 13, 2012

Thanks, Jan. On Thu, Sep 13, 2012 at 12:10 PM, Jan Urbański <wulczer(a)wulczer.org> wrote: > On 13/09/12 21:04, David Serafini wrote: > >> How did you implement this? Did you use txamqp as a model or develop your >> own approach? >> > > No, I took pika (that already implements AMQP), wrote code to make it > usable from a Twisted reactor and then added a Deferred layer on top of > that. > > Pika already works with Tornado, so it was more or less prepared for being > integrated in an event loop, such as the Twisted reactor. > > Here's an example of how to use it: > > https://github.com/pika/pika/**blob/master/examples/demo_**twisted.py<https://github.com/pika/pika/blob/master/examples/demo_twisted.py> > > Best, > Jan > >

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[Twisted-Python] Does Twisted support TCP MD5 Signature Option?
by Peng Xiao -X (penxiao - DLSP at Cisco) Sept. 13, 2012

Sept. 13, 2012

Hi experts Does Twisted support TCP MD5 Signature Option? If does, how to use this? Very thanks. Best Regards, Xiao Peng

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[Twisted-Python] interface kombu with twisted
by David Serafini Sept. 13, 2012

Sept. 13, 2012

I know about txAMQP. Has anyone done any work interfacing the kombu API with twisted? thanks in advance, <dbs>

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[Twisted-Python] implementing NAMES in IRC
by Art Scheel Sept. 11, 2012

Sept. 11, 2012

First, I apologize if this is not the appropriate place for this. I have a basic bot written as a mechanism for learning classes and methods. I think I've got methods down, but classes are kicking my butt. As a personal exercise, I'm trying to implement a check in an IRC bot to see if the person issuing a command has oper (@) status. in IRC this is done with the 'NAMES <#channel>' command. Google gives me this: http://stackoverflow.com/questions/6671620/list-users-in-irc-channel-using-… My own research points me to this: http://twistedmatrix.com/trac/browser/trunk/twisted/words/protocols/irc.py#… Now, is stackoverflow overriding that method or was it perhaps written prior to the implementation of the irc.py portion I linked to? My code is here. I am attempting to parse the names list at line 110 http://bpaste.net/show/Fll7at9Z3b8nD6GDNN14/ I don't know if I should be using twisted/words/protocols/irc.py or twisted/words/im/ircsupport.py. Can someone point me in the right direction as to what I need to do to grab the list of names at that particular spot using Twisted's in methods? If it cannot be done with the Twisted's methods, am I to understand that's what the StackOverflow post was doing? Yes, I know the code is ugly. I can clean it up after I understand what I'm doing more fully. -- Molon Labe "Come and take them" "The Marines I have seen around the world have the cleanest bodies, the filthiest minds, the highest morale, and the lowest morals of any group of animals I have ever seen. Thank God for the United States Marine Corps!" -Eleanor Roosevelt

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[Twisted-Python] Weekly Bug Summary
by exarkun＠twistedmatrix.com Sept. 8, 2012

Sept. 8, 2012

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[Twisted-Python] AutobahnPython 0.5.8 released
by Tobias Oberstein Sept. 7, 2012

Sept. 7, 2012

This is a maintenance release. Fixes: - Twisted 12.2 compat. - WebSocket Twisted Web resource with TLS - processing WS close with Hixie-76 - some code+doc cleanups Cheers, Tobias

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[Twisted-Python] Fourat ZOUARI invited you to check out Dropbox
by Dropbox Sept. 7, 2012

Sept. 7, 2012

Fourat ZOUARI wants you to try Dropbox! Dropbox lets you bring all your photos, docs and videos with you anywhere and share them easily. Accept invitation here: http://www.dropbox.com/el/?r=/referrals/NjI1NjUxOTkwMDc%3Fsrc%3Dreferrals_b… - The Dropbox Team ____________________________________________________ To stop receiving invites from Dropbox, please go to http://www.dropbox.com/bl/676b00e8cad3/twisted-python%40twistedmatrix.com

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[Twisted-Python] Store simple value in web session
by Benoît Fleury Sept. 5, 2012

Sept. 5, 2012

Hi, I would like to store a simple (immutable) value in a web session. Here are the options I see so far: - use the component architecture (seems a bit overkill...) - subclass Session to hold the value I want to store - patch Session to behave like a dictionary (didn't look at the code, not sure if it makes sense...) I'm also curious about the advantages of this component architecture for the session object instead of a simple dictionary? Thanks, Benoit.

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