Mailman 3 April 2011 - Twisted

[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. ______ __ __ _____ _ _ | ____ | \_/ |_____] |_____| |… [View More]

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by Tamika May 1, 2019

May 1, 2019

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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,… [View More]

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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 … [View More]

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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 … [View More]

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[Twisted-Python] http.Request and JSON
by Vincent Gulinao Jan. 25, 2012

Jan. 25, 2012

How do you read JSON content from a POST using http.Request. I peeked on args and it's empty. TIA.

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[Twisted-Python] 100% CPU on high opened descriptors
by Juan Antonio Ibañez Santorum May 19, 2011

May 19, 2011

Hello! I have a Linux box serving my twisted app. All works ok except after some days running (where I can see my CPU going to 100%). I saw that CPU goes 100% usage when the app reaches to 1024 opened descriptors (sockets). It seems TM isn't closing some connections when clients loose connection to the server. I have no more than 200 simultaneous clients, each of then using a single connection. Any idea why those connections remain open? Regards

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[Twisted-Python] Ubuntu package of Twisted 11.0 for Lucid
by Alexandre Quessy May 1, 2011

May 1, 2011

Hello everyone, I just made a Ubuntu package of Twisted 11.0 or Ubuntu Lucid (10.04) and put in on a PPA: https://launchpad.net/~sat-metalab/+archive/metalab To install it, simply do this: sudo add-apt-repository ppa:sat-metalab/metalab sudo apt-get update sudo apt-get install python-twisted-core Once enough people tested it, someone could copy it to the official Twisted PPA. And then, we can build it for Ubuntu Maverick as well. There is only one doubt I have, that should be sorted out … [View More]

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[Twisted-Python] Did anyone use twisted on windows (IOCP)?
by Dfgqq Dfgqq April 29, 2011

April 29, 2011

Hi All Currently, i am planning rewrite some parts with twisted & iocp. These parts are related to Tcp connection without SSL. I want to know whether IOCP is ready for production or not. I ran some tests with twisted 10.20, 8.10 before. The IOCP part had many problems. I haven't give a try with 11.0. What is the progress for windows support? Thanks gelin yan

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[Twisted-Python] Question about StreamServerEndpointService
by Albert Brandl April 28, 2011

April 28, 2011

Hi! I have a question regarding `t.a.i.StreamServerEndpointService`. This class maintains an attribute `_waitingForPort` that holds the deferred returned by the `listen` method of the endpoint. If this attribute is None, the method `privilegedStartService` is called by `startService`, triggering the endpoint's `listen` method (among other things). I don't understand why this attribute is not reset to `None` when `stopService` is executed. With the deferred still around, starting the … [View More]

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[Twisted-Python] Anyone ever used successfully sqlanydb together with Twisted and adbapi?
by Hynek Schlawack April 27, 2011

April 27, 2011

Hi, I've essentially written a whois daemon that serves via TCP as well as via web, fetching its data from a sqlanywhere 12 server, using the official sqlanydb driver. Everything works fine except for occasional SIGABRTs (or inside of gdb: SIGSEGVs inside of the sqlanywhere binary driver) in the first query. If that one works, it keeps running. However it's impossible to run tests as at some point it always crashes while doing queries because I recreate the pool for every test. Essentially … [View More]

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[Twisted-Python] Instrumenting Reactors
by Paul Thomas April 26, 2011

April 26, 2011

I have a reactor which is getting busier over time and I'd like to find out where the cycles are going. Using the profiler isn't really practical on a server running for days, so I'd like to instrument the reactor to show me which I/O events are taking the longest to deal with. Should I just hack into the reactor somewhere? Or is there something sitting in a library I haven't seen that will help with this? Paul.

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[Twisted-Python] Weekly Bug Summary
by exarkun＠twistedmatrix.com April 24, 2011

April 24, 2011

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[Twisted-Python] Twisted Plugins - Implementation Discussion
by Stephen Thorne April 22, 2011

April 22, 2011

G'day, So Glyph and I had a discussion about the architecture and implementation of plugins on IRC this week, I raised some issues that I've seen with implementing plugins in that discussion, and he said that I should take the discussion to the list because IRC wasn't the right place for it. First of all, a quick discussion of the current plugin architecture, so that we're on the same page. 'twistd' automatically imports python modules from under twisted/plugins relative to sys.path[1], or … [View More]it loads a cache of those plugins from dropin.cache, or it loads a cache of those plugins from dropin.cache. The reason it loads all of those plugins is so that 'tapname' and 'description' can be grabbed out of all of the serviceMaker attributes of all those modules. Then running 'twistd' shows a helpful list of commands, and 'twistd $tapname' uses the correct serviceMaker to start whatever service is specified. Part of the discussion was about how to rewrite this in such a way that no python code needs to be run in order to discover all the tapname+description combinations that are available to twistd, this is because of a perceived performance and sanity deficit in using 'twistd'. In the course of the discussion I raised several things that I consider annoyances in the twisted plugin system. I will repeat them here. First, the reason i use twisted plugins is because they're the a way to easily do sensible things with logging, daemonisation and interaction from init.d files. * The number of imports required to compose a plugin is annoying. 2 interfaces from two different packages, plus needing zope.interface.implements. * I've never liked the twisted arg parser, I use it only grudingly, it would be nice to be able to throw argv at my make_service call. * The entire task of having this python plugin is to link up the metadata with a more or less standard * It's very easy to accidentally make your plugin load your package for every other twistd daemon running out of the same plugin cache. * The practice of putting a module under twisted/plugins/$mymodulehere.py upsets my equilibrium, the only reason I tolerate this kind of thing is that I install my python code via rpms and I automatically get installation, ownership and uninstallation done in a stable manner. For your consideration, and (constructive) critcism, here is a twisted plugin that is nearly identical to 6 that I have running in production: from zope.interface import implements from twisted.python import usage from twisted.plugin import IPlugin from twisted.application.service import IServiceMaker class Options(usage.Options): optFlags = [['debug', 'd', 'Emit debug messages']] class ExampleServiceMaker(object): implements(IServiceMaker, IPlugin) tapname = 'example' description = 'Example Twistd Plugin' options = Options def makeService(self, options): from examplepackage.examplemodule import make_service return make_service(debug=options['debug']) serviceMaker = ExampleServiceMaker() >From these 19 lines of code there are 4 things that are relevent: tapname = example description = 'Example Twistd Plugin' options = {'debug':True} if args == ['--debug'] else {'debug':False} service = examplepackage.examplemodule.make_service(**options) Only 2 of which are relevent for running a twistd daemon other than 'example' So the goal of my post to this mailing list is: * I would like glyph's goal of having less arbitary code executed at twistd launch time to become a realisation, * I would like the process of creating a twisted plugin to be less of a cut+paste+fill-in-blanks hassle. -- Regards, Stephen Thorne Development Engineer Netbox Blue [View Less]

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[Twisted-Python] Understanding deferred and error handling
by David April 22, 2011

April 22, 2011

Hi, I have a hard time figuring out error handling with deferred in twisted. More exactly, I don't understand how to always get meaningful tracebacks to understand where the error actually happened. For a simple example: import sys import twisted.web.client from twisted.internet import defer from twisted.internet import reactor from twisted.python import log def remote_call(): # No process bound to 8083 -> connection refused d = twisted.web.client.getPage("http://localhost:… [View More]8083") return d def main(): d = remote_call() def _stop(arg): reactor.stop() d.addBoth(_stop) log.startLogging(sys.stdout) reactor.callWhenRunning(main) reactor.run() This will simply print no error in the log: 2011-04-20 12:37:40+0900 [-] Log opened. 2011-04-20 12:37:40+0900 [-] Starting factory <HTTPClientFactory: http://localhost:8083> 2011-04-20 12:37:40+0900 [HTTPPageGetter,client] Stopping factory <HTTPClientFactory: http://localhost:8083> 2011-04-20 12:37:40+0900 [-] Main loop terminated. This already bothers me at a fundamental level, because it means it is very easy to "swallow" errors without being aware of it. Is there a "systematic" solution to this issue, or am I condemned to handle errors systematically everywhere in my code ? Now, if I add an errback for logging purpose: def main(): d = remote_call() def _stop(arg): reactor.stop() d.addErrback(log.err) d.addBoth(_stop) I get something like: 2011-04-20 12:38:35+0900 [-] Log opened. 2011-04-20 12:38:35+0900 [-] Starting factory <HTTPClientFactory: http://localhost:8083> 2011-04-20 12:38:35+0900 [HTTPPageGetter,client] Unhandled Error Traceback (most recent call last): Failure: twisted.web.error.Error: 404 Not Found 2011-04-20 12:38:35+0900 [HTTPPageGetter,client] Stopping factory <HTTPClientFactory: http://localhost:8083> 2011-04-20 12:38:35+0900 [-] Main loop terminated. I do get an error, but I don't get a traceback. Interestingly enough, if I use printTraceback: def main(): d = remote_call() def _stop(arg): reactor.stop() def log_error(failure): log.err(failure.printTraceback()) return failure d.addErrback(log_error) d.addBoth(_stop) I don't get any traceback either. I found quite a few documents on how to handle errors in twisted, but I did not see much information on how to at least make sure unexpected errors are being shown (and fixed later). cheers, David [View Less]

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[Twisted-Python] Running twistd with a compiled file
by Albert Brandl April 21, 2011

April 21, 2011

Hi! It is sometimes necessary to deploy an application without the sources. But when I try to start the twistd daemon with a compiled Python file, it raises the following traceback: $ twistd -ny application.pyc Traceback (most recent call last): File "/usr/local/lib/python2.6/dist-packages/Twisted-10.0.0-py2.6-linux-i686.egg/twisted/application/app.py", line 631, in run runApp(config) File "/usr/local/lib/python2.6/dist-packages/Twisted-10.0.0-py2.6-linux-i686.egg/twisted/scripts/… [View More]

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[Twisted-Python] Weekly Bug Summary
by exarkun＠twistedmatrix.com April 18, 2011

April 18, 2011

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[Twisted-Python] Python 2.7 on 64 bit Fedora 11
by exarkun＠twistedmatrix.com April 17, 2011

April 17, 2011

Greetings, We've had a Fedora 11 slave for a little while now (hosted by Flumotion, thanks!). It's been green just about since it came up, so I think we should call it a supported platform now. It will show up on the buildbot supported platforms page and force- builds.py will include it (once you update your checkout). Jean-Paul

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[Twisted-Python] Announcing pyOpenSSL 0.12
by exarkun＠twistedmatrix.com April 12, 2011

April 12, 2011

Exciting news everyone, I have just released pyOpenSSL 0.12. pyOpenSSL provides Python bindings to a number of OpenSSL APIs, including certificates, public and private keys, and of course running TLS (SSL) over sockets or arbitrary in- memory buffiers. This release fixes an incompatibility with Python 2.7 involving memoryviews. It also exposes the "info callback" constants used to report progress of the TLS handshake and later steps of SSL connections. Perhaps most interestingly, it … [View More]

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[Twisted-Python] Weekly Bug Summary
by exarkun＠twistedmatrix.com April 10, 2011

April 10, 2011

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[Twisted-Python] WaitForMultipleObjects socket limitation
by anatoly techtonik April 9, 2011

April 9, 2011

Hi, I've made a proof of concept for asynchronous console input on Windows [1] and now I am trying to understand the limits of WaitForMultipleObjects API I've used. Documentation on win32eventreactor mentions limit for 64 objects: http://twistedmatrix.com/documents/11.0.0/api/twisted.internet.win32eventre… However, it is completely opaque what these objects are? For console handles and process handles it is quite obvious, but not for sockets. Is 64 the limit for total amount sockets opened … [View More]

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Re: [Twisted-Python] Twisted Plugins - Implementation Discussion
by Stefano Debenedetti April 8, 2011

April 8, 2011

On Apr 7, 2011, at 1:08 AM, Tim Allen wrote: > If you need a non-Turing-complete config language and rule out .ini and > XML, I'm not sure what's left. JSON, perhaps. I bet a lot of people have a deja-vu feeling about a config file syntax debate so I'll propose an alternative approach: RDF. Perhaps most people in this community will not like it, yet some might find it more fun that revamping their 2002 arguments about merits and pitfalls of various syntaxes. One of the reasons why I … [View More]

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[Twisted-Python] Asynchronous context in Twisted
by Fantix King April 7, 2011

April 7, 2011

Hi, I tried to make python.context work in asynchronous code between main loops. Anyone has similar experience to share please? Not sure if I am rebuilding a wheel :P http://code.google.com/p/little-site/source/browse/littlesite/custom_reacto… BR, Fantix.

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Re: [Twisted-Python] Twisted Plugins - Implementation Discussion
by Tristan Seligmann April 7, 2011

April 7, 2011

On 7 Apr 2011 06:56, "Glyph Lefkowitz" <glyph(a)twistedmatrix.com> wrote: >> - Each section blah blah terrible user interface stuff about 'sections' and other misfeatures of ini files. > > > I don't want a solution that is hard-coded to deal with the metadata that 'twistd' specifically needs, as Twisted plugins are already used for more than just twistd plugins, and I'd like them to be used for even more. An interface that limits the metadata to ConfigParser sections … [View More]

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[Twisted-Python] Persisted protocol?
by anatoly techtonik April 6, 2011

April 6, 2011

Hi again, >From http://twistedmatrix.com/documents/current/core/howto/udp.html """As you can see, the protocol is registered with the reactor. This means it may be persisted if it's added to an application...""" What does 'persisted` here mean? -- anatoly t.

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