Mailman 3 March 2012 - Twisted

[Twisted-Python] Twisted Python 0.7.0 Prerelease Testing
by Glyph Lefkowitz 05 Aug '21

05 Aug '21

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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01 May '19

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[Twisted-Python] [ANN] txZMQ released
by Andrey Smirnov 21 Jul '14

21 Jul '14

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 02 Oct '13

02 Oct '13

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 28 Apr '13

28 Apr '13

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] the good, the log, and the ugly
by Glyph 31 Mar '12

31 Mar '12

Right now, we have a pretty bad logging idiom. All over Twisted, you'll find stuff like this: log.msg("twistd %s (%s %s) starting up." % (copyright.version, sys.executable, runtime.shortPythonVersion())) ... log.msg("Loading %s..." % filename) ... log.msg("Received unhandled keyID: %r" % (keyID,)) In other words, log messages that take structured information, but then smash it into a not-particularly-distinctive string and spit it out into a line-delimited file. The Twisted log system has, from its very beginning, supported a better style of formatting, which is: log.msg(format="twistd %(version)s (%(executable)s %(short)s) starting up.", version=copyright.version, executable=sys.executable, short=runtime.shortPythonVersion())) ... log.msg(format="Loading %(filename)s...", filename=filename) ... log.msg(format="Received unhandled keyID: %(keyID)r", keyID=keyID) There are lots of other features which this style of logging could support, as well, with relatively minor tweaks, such as trivial enhancements like: def logger(module, audience, importance): def logIt(**kw): log.msg(module=module, audience=audience, importance=importance, **kw) return logIt ... info = logger(__name__, ADMIN, NORMAL) bugreport = logger(__name__, DEVEL, HIGH) debug = logger(__name__, DEVEL, LOW) ... info(format="twistd %(version)s (%(executable)s %(short)s) starting up.", version=copyright.version, executable=sys.executable, short=runtime.shortPythonVersion())) This would then allow us to build systems which internally filter messages, avoid expensive string formatting and copying when it's not necessary, tune logging to different levels for different parts of the package hierarchy, and have intelligent real-time log analysis that inspects the objects being logged without having to apply regexes or other static-string-inspection methods to figure out which messages are interesting. Calendar Server implements some of these features for its logging system, and they've been very useful there. Various Divmod projects have implemented run-time statistics tracking via that Twisted logging system, and that worked pretty well too. It would be good to start taking advantage of the good parts of Twisted's logging system within Twisted itself. Doing this in a consistent way would also open up the possibility of localizing our log messages, which is currently not really plausible. And also, of logging in a format which lost less information; for example, instead of actually doing textToEventDict, simply dumping a simplified form of the event dict itself to some structured format that could be reliably parsed – something like JSON – for easier parsing and analysis later. However, in order to be able to take advantage of these features when they're added, we need to start avoiding premature string formatting everywhere that we can today. If you're writing log messages within twisted (or within a twisted application or library) please adopt the format=, x=, y= style of logging messages so that log observers can actually see into the objects being logged and do interesting things with them. We should also file some tickets about improving the documentation to indicate this style, for writing a new interface to logging which mandates this style, and for adding layers on top of that to provide more useful functionality like the aforementioned per-module or per-audience filtering. I have long despaired of filing such tickets because they each seem like boil-the-ocean tasks, changing every single call-site of log.msg (there are more than 500 as of today, just in Twisted itself, and thousands more in other applications I'm sure). I'm going to try to get started on record my desired behavior for logging as tickets soon though, so Twisted can at least have some really good logging tools eventually. -glyph

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[Twisted-Python] returning a deferred in getStateToCopyFor.
by Flint 31 Mar '12

31 Mar '12

Hi, all. using PB i wanted to implement some access control check on my copyable objects. so i placed that in getStateToCopyFor, all is ok except when i need to perfom some asynchronous call in that method. ex: (i use twisted 10.1.0) ... def getStateToCopyFor(self, user): state = self.getStateToCopy() d = user.has_perm() # this do an asynchronous call def got_perm(allowed, state): if not allowed: state['secret'] = '' return state d.addCallback(got_perm, state) return d ... here user.has_perm performe a database access so it returns a deferred, but when i return that deferred, i got an error saying that 'state' is not a dict (which is quit normal cause it's a deferred). it seems pb do not handle this case, i know i can put my control logic directly in the view method (where returning a deferred is handled) but this will lead to a lot of code duplication, and i really thought that getStateToCopyFor is made for that purpouse. so i wanted to ask what's the best way to achieve that ? Thankx !

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[Twisted-Python] The opposite function of reactor.listenTCP()
by hz hanks 30 Mar '12

30 Mar '12

Hi All, I have a server listen to two ports and run as follows: reactor.listenTCP(PORT1, file_trans_service.getFileTransCtrlServFactory() reactor.listenTCP(PORT2, file_trans_service.getFileTransCtrlServFactory() reactor.run() Now I want to close the function of PORT1, but I just don't find the opposite function of reactor.listenTCP(). Anyone can give me a hand? Best, Hanks

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[Twisted-Python] Conflict between Tkinter.mainloop() and twisted.internet.reactor.run()
by hz hanks 30 Mar '12

30 Mar '12

Hi all, I'm writing a program with Twisted and use Tkinter to realize the GUI interface. However, it seems that I can not run both Tkinter.mainloop() and twisted.internet.reactor.run() in the same thread because they will block the other. I tried to program a button in Tkinter and when the button is pressed, it will start a new thread using module threading, and call a function with the contend of reactor.listenTCP(PORT, file_trans_service.getFileTransCtrlServFactory() reactor.run() But it will raise an exception as follows: --- <exception caught here> --- File "F:\Python27\lib\site-packages\twisted\internet\base.py", line 426, in _continueFiring callable(*args, **kwargs) File "F:\Python27\lib\site-packages\twisted\internet\base.py", line 1164, in _reallyStartRunning self._handleSignals() File "F:\Python27\lib\site-packages\twisted\internet\posixbase.py", line 292, in _handleSignals _SignalReactorMixin._handleSignals(self) File "F:\Python27\lib\site-packages\twisted\internet\base.py", line 1129, in _handleSignals signal.signal(signal.SIGINT, self.sigInt) exceptions.ValueError: signal only works in main thread And I also tried to run twisted.internet.reactor.run() in the main thread, and use module threading or reactor.callInThread() to run Tkinter.mainloop(). The interface will be displayed, but not responding. Any one knows how to solve this problem? I just need a Template to realize the Twisted with GUI. Very appreciated! Best, Hanks

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[Twisted-Python] Problem with additional connection
by hz hanks 29 Mar '12

29 Mar '12

Hi, all I'm writing a client program with Twisted. The client will first connect one server, and based on the data received in the function of dataReceived, the client need to connect other servers. I just tried to call reactor.connectTCP(another_host, another_port, another_factory) one more time, but there's an exception. Is the twisted allowed to that? Or is there some rules should be followed to achieve that? Best, Hanks

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