Mailman 3 November 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] Reconnecting PB Client
by Don Smith 12 Sep '07

12 Sep '07

Does anyone have some example code for building a reconnecting PB client? This is what I have now: from twisted.spread import pb from twisted.internet import reactor from twisted.python import util events = pb.PBClientFactory() reactor.connectTCP("localhost", 8789, events) queue = events.getRootObject()

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[Twisted-Python] Producers / Consumers and more examples tutorials?
by jarrod roberson 13 Mar '07

13 Mar '07

Are there any more concrete examples or tutorials of using Producers and Consumers?

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[Twisted-Python] Support for ICMP ping?
by Nicolas D. Cesar 08 Feb '07

08 Feb '07

I've been googling if there is any 'ICMP ping' support in Twisted. I've encounter ancient replies: http://twistedmatrix.com/pipermail/twisted-python/2003-August/005542.html I wonder if today is any ICMP support. I've tried to search the source tree[1], and doesn't seem. My actual needs is creating a DeferredList with "ping-testers" for different IPs, just to check if there up or not. I know I can end up using twisted.internet.utils.getProcessOutput and calling ping, as I would normally do from command line. For other newbies as me in the same situation please read: http://twistedmatrix.com/users/moshez/talk.html and search for 'getProcessOutput' ;-) Greetings, [1] my search was: -------------------------------------------------------------------- $ grep -C3 -ir icmp * internet/protocol.py- internet/protocol.py- internet/protocol.py-class AbstractDatagramProtocol: internet/protocol.py: """Abstract protocol for datagram-oriented transports, e.g. IP, ICMP, ARP, UDP.""" internet/protocol.py- internet/protocol.py- transport = None internet/protocol.py- numPorts = 0 -- internet/protocol.py- def connectionRefused(self): internet/protocol.py- """Called due to error from write in connected mode. internet/protocol.py- internet/protocol.py: Note this is a result of ICMP message generated by *previous* internet/protocol.py- write. internet/protocol.py- """ internet/protocol.py- -------------------------------------------------------------------- -- Nicolás D. César <ncesar(a)lunix.com.ar> Lunix S.R.L. -[ http://www.lunix.com.ar ]- GnuPG Public Key: gpg --keyserver wwwkeys.pgp.net --recv-key 0x3606F3E6

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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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Re: [Twisted-Python] trac's reliability
by glyph＠divmod.com 01 Dec '06

01 Dec '06

On 27 Nov, 07:04 pm, foom(a)fuhm.net wrote: >The other option is to upgrade wolfwood to debian stable ("sarge") and then >just install svn 1.4 from testing. That might be a good idea anyhow, since >oldstable is, well, old. And unsupported. It would be good to know, for the purposes of such discussions, who the official admin of these hosts is. If I knew, I'd ask that person to please upgrade everything to Dapper, thanks to its long updates support cycle and my relatively stable experience with it. Without knowing who it was and how long it's going to take though, it's hard to make suggestions.

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Re: [Twisted-Python] Need Exception that will stop ther reactor within twistd
by glyph＠divmod.com 30 Nov '06

30 Nov '06

On 27 Nov, 06:19 pm, ncesar(a)lunix.com.ar wrote: >El S�bado, 25 de Noviembre de 2006 02:39, glyph(a)divmod.com escribi�: >> >I was wondering if twistd/the application class could have a "exit on >> >Exception" for this type of operations. >> In general this is a bad idea. There are basically 3 kinds of code you can >> write with Twisted: >> >> 1. Infrastructure code, which implements a protocol and provides APIs for >> parsing and dealing with events. This kind of code should never contain a >> reactor.stop at all. >Actually is type 1, but there are horrible (network) conditions were de >application should stop. No, there aren't. What happens when I run your application in-process with my webserver? Should the webserver stop simply because your protocol is not working? >Even it's not type 3, I get your point. And thats why I didn't want to write >ANY reactor.stop() call, instead just raise exceptions- And have a unnified >reactor.stop() inside somewhere in twistd. But it seems I need to think >another solution. Right now as a workaround, reactor.stop() will be inside my >exception's __init__ function ;-) Just don't call reactor.stop at all unless you are writing top-level infrastructure code. Your application should have some other, more structured way of reporting fatal shut-down errors to its run container (e.g. runContainer.applicationEncounteredFatal(xxx)), not simply raising exceptions and hoping someone is listening. Unless you give more specifics that indicate that your special case is special-er than any other I've seen before, I'll stand by this. :) >> Don't try to always stop the *process* when your program is >> complete: stop the *program* by keeping a Deferred around which represents >> its complete run. That way the *driver* for the program is responsible for >> stopping it, and when you want to aggregate multiple runs of it, you can >> easily use a tool like DeferredList, or do something different in the >> callbacks at the end. > >I couldn't understand much of this last parragraph (my English reading could >be part of the problem). I understand algorithms mucho more when are written >in python instead of English, Do you have a link to some code explaning >this? It's hard for me to think of a program which does this in a simple way. If I can think of one I will post an example.

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[Twisted-Python] downloading the code of the FIXED lore so that I can use it to output multi-chapter lore source to latex
by Dominik Margraf 30 Nov '06

30 Nov '06

I need to process the thinkCSpy ebook lore source to latex urgently, however there is a bug in the curent stable version which prevents compiling spanned chapters. http://twistedmatrix.com/trac/ticket/2134 which is fixed very recently but doesn't yet seem to be merged with the trunk (I have downloaded the svn trunk and tried its lore, but still has the same bug) Can anyone give me (or point to the place where I can download) the updated file so that I can do my job immediately? Thanks! Dominik

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Re: [Twisted-Python] blockingCallFromThread, ticket 1042
by glyph＠divmod.com 29 Nov '06

29 Nov '06

On 06:47 pm, markus(a)bluegap.ch wrote: >A long time ago, I've been asking about a blocking callFromThread function >and have been pointed to ticket 1042 at [1]. What's the state on that? Does >that have a change of being integrated into twisted? At the very least, the function there needs tests, documentation, and a use-case for some code that is going to want to call it from within Twisted - and I don't think there is any currently. There are probably a few things that are painful to do without such a function, but in general this sort of thing is just a recipie for deadlocks and running out of threads in your pool, so I am not inclined to push it forward.

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