Mailman 3 June 2006 - 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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[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] Problem: spawnProcess() never ending when installSignalHandlers=False
by Matt Feifarek 03 Feb '07

03 Feb '07

Hello. I'm using Twisted 1.3.0 on python2.4 on an Ubuntu-Hoary x86 Linux box. I'm using twisted and spawnProcess() with a Queue structure to chain processes that need to be called (specifically, imagemagick commands). I use the "processEnded" event/method of t.i.p.ProcessProtocol to go from one task to the next. Twisted shares a python process with a multi-threaded web-app-kit (Webware) so it has to be run in a thread. This worked well on other older versions of twisted and older versions of python; also on linux. I've tracked down the problem to be twisted itself (or my incorrect use of it) rather than my code. This example illustrates it: ------------------------------------------------- from twisted.internet import reactor from twisted.internet.protocol import ProcessProtocol class MyProt( ProcessProtocol ): def processEnded(self, reason): print "ended.", reason executable = '/bin/touch' args = ( '/tmp/foo.txt', ) args = (executable,) + tuple(args) reactor.spawnProcess( MyProt(), executable, args ) reactor.callLater( 5, reactor.stop ) #reactor.run() reactor.run(installSignalHandlers=False) ------------------------------------------------- As is, this code never runs the "processEnded()" method of MyProt(). If I change the reactor.run() parameter to leave the signal handlers on, it works. Note that I need to leave the signal handlers turned off because I can't run the reactor in the main thread; Webware needs that. I also know that the subprocess is giving up its file descriptors; I can see that if I put more print statements into MyProt(). And I know that the subprocess is working; /tmp/foo.txt is there. It seems that somehow the reactor is using signals to notice when a process has ended; this makes a certain ammount of sense intuitively, though I don't understand the nitty-gritty of processes and signals at all. And more importantly, this has worked before on other combinations of twisted/python. Is this a bug? If so, has it been fixed? If not, what should I do to detect when a spawned process is finished? Thanks very much. Twisted rocks.

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[Twisted-Python] Service dependencies
by Matt Goodall 10 Jul '06

10 Jul '06

Hi, I have a couple of services. The second is dependent on the first being fully initialised before the second gets set up. I thought that the order of Service startup was typically handled by organising services in a hierarchy, and that the startup of the hierarchy understood deferreds. I was wrong - service.Application is a MultiService and only understands deferreds in stopService. There's a DependentMultiService class in twisted.internet.app but that entire module has been deprecated. Is there a reason why the MultiService does not support deferreds in startService? Is there a reason that DependentMultiService was not moved across to the twisted.application package? In other words, what is the recommended way of starting services in the correct order, including waiting for them to get initialised fully, these days? Thanks. - Matt -- __ / \__ Matt Goodall, Pollenation Internet Ltd \__/ \ w: http://www.pollenation.net __/ \__/ e: matt(a)pollenation.net / \__/ \ t: +44 (0)113 2252500 \__/ \__/ / \ Any views expressed are my own and do not necessarily \__/ reflect the views of my employer.

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[Twisted-Python] Status of wxPython support in Twisted 2.1: use wxreactor
by Itamar Shtull-Trauring 02 Jul '06

02 Jul '06

wxreactor in Twisted 2.1 uses threadedselectreactor. This means that wx apps ought to use wxreactor, not TSR directly; there are some issues with vanilla TSR wx integration that are also present in wxreactor, but will be fixed in future versions of wxreactor. What's broken (there may be more): 1. reactor shutdown events aren't handled correctly (e.g. Deferred returned from during-shutdown event). 2. Signal handling for e.g. Ctrl-C is caught by wx, not twisted. In order to get these fixed I need your help. I have a version of wxreactor that *probably* fixes these in Subversion trunk. You can try it out by running doc/core/examples/wxdemo.py. Hitting Ctrl-C, choosing Exit from the menu or closing the menu all should have the same effect - the application logs "shutting down in 0.3 seconds...", "2", "1", "0" then exits. In addition, "Hello world" should continue to be printed while the dialog box is open or you are holding down a menu. Please try this out, and report success or failure at <http://twistedmatrix.com/bugs/issue1235>. I'm especially interested to hear if it works on Windows or Mac OS X. Please include your OS and version of wxPython/wxWidgets when submitting reports.

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[Twisted-Python] Compressing PB communication
by Tzahi Fadida 30 Jun '06

30 Jun '06

I am interested in compressing the PB objects after serialization and unpacking when received at the other side. I a using the pb.PBClientFactory() and ServerFactory from the documentation. Where is the most proper place to hack this? What is possible? I need to do this after the object becomes a string so i won't have to pickle a string. Is it possible to do something like factory.protocol.serialize=mySerialize and in mySerialize i use the banana.encode function to encode the list of jelly myself and return there a new list that contains the now ziped and encoded value and let it go as it were. This way i am not interfering with the jelly logic. -- Regards, Tzahi. -- Tzahi Fadida Blog: http://tzahi.blogsite.org | Home Site: http://tzahi.webhop.info WARNING TO SPAMMERS: see at http://members.lycos.co.uk/my2nis/spamwarning.html

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[Twisted-Python] sAsync 0.1
by Ed Suominen 30 Jun '06

30 Jun '06

Version 0.1 of sAsync, "SQLAlchemy Done Asynchronously" has been released at http://foss.eepatents.com/sAsync. It provides a Twisted-compatible way to use SQLAlchemy. There are now some usage examples at http://foss.eepatents.com/sAsync/wiki/Examples thanks to some people who are apparently already using the package. "sAsync offers asynchronous access to the outstanding SQLAlchemy package by Michael Bayer. It is built around an 'access broker' object that provides a priority-queued asynchronous interface to database accesses. By wrapping your database-access methods in a @transact decorator, you can put the underlying method call in a queue with whatever scheduling priority you designate and immediately obtain a Deferred object that references the eventual result of the database transaction. The access broker also includes structure for convenient and integrated table setup, startup, and shutdown. "The package also provides higher-level SQLAlchemy enhancements including persistent item storage with deferred read and write results, and a persistent dictionary-like object using that storage. Text indexing and searching, again with deferred 'behind the scenes' processing, will be included at some point."

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[Twisted-Python] LineOnlyReceiver does not notice when connection's failing
by Christian Schneider 30 Jun '06

30 Jun '06

Hi all, I've got a twisted application that uses a LineOnlyReceiver as its protocol. All connections between clients and my server are open ended so I have to be sure they are working correctly. However, when I disrupt the network connection between a client and the server, the server happily keeps writing to the connection while the client closes its part and re-connects again. I am using sendLine to send the data but have also tried transport.write and transport.writeSomeData but with these no data is being sent at all! So, anyone knows what I have to do to get signalled when writing to a connection fails? Any help would be very welcome. Thanks, chris

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[Twisted-Python] Twisted-friendly Message bus
by Phil Mayers 30 Jun '06

30 Jun '06

All, I've run into "this service needs to know about this event from this other service" once too often. It's message bus time, baby. However, many of the daemons I use are locally-written Twisted code, so a Twisted-friendly (async api) one would be nice. Note also that other non-Twisted code will need to connect to it, so rolling my own (aside from it being a bad idea from a NIH perspective) is out. I could of course wrap the message queue receiver for something well-proven like Spread into a thread. Then there's XMPP which is the darling of the anti-Java movement - though wrapping Twisteds' XMPP API to get a message bus might be annoying. Suggestions?

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[Twisted-Python] URLLIB under twisted...
by Chaz. 30 Jun '06

30 Jun '06

I was wondering if anyone knows of a URLLIB like facility under Twisted? Chaz

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