Mailman 3 June 2008 - 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] 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] SQLAlchemy and Twisted
by alex clemesha 13 Feb '09

13 Feb '09

Hi, I didn't want to hijack the 'Twisted Presentation Materials..' thread, so I started this one ... First off, in the other thread, Glenn, you mentioned Storm. I have heard of Storm, but never got any deeper that noticing that it is still a work in progress (maybe things have settled down ?) If anyone has anything to say on how it might be a good choice with Twisted, please feel free to enlighten us! But, I hoping to solve some immediate problems with Twisted and SQLAlchemy, so ... >> >> * A main "App Server", that controls high level access with "twisted.cred" >> * Web frontend: "twisted.web2" >> * Data: some "twisted.enterprise.adbapi", moving to SQLAlchemy. > > Interesting; how are you handling asynchrony in SA? This is the issue that we're stilling unclear on, and I really would like to know of the best way of integrating Twisted with SQLAlchemy. Twisted devs / experts: Please, could you comment on the right way of using Twisted and SQLAlchemy together. Anyone: If anyone know of existing code that integrates Twisted and SQLAlchemy nicely, please share! RIght away I just went about the problem be wrapping each call to SQLAlchemy in a "deferToThread" inside my "DatabaseManager" class. At startup of my app, I make an instance of this class, and pass it to each "avatar" (in "requestAvatar", in my portal) Here is my Database Manager: (you will actually see that I 'turned off' the deferToThread wrapping for now): http://trac.knoboo.com/browser/branches/knoboo-sqlalchemy-take2/knoboo/data… but I really haven't convinced myself that this is the best way of doing things. Hell, it could be totally wrong, so if anyone has any advice, I would be very appreciative! > I'm aware of sAsync, > but haven't looked much into it. (I'm a step or two behind you, actively > using adbapi, and thinking about moving to SA when I get some breathing > room.) I've looked into SAsync as well, but it is not totally clear to me what the extra benefit of it is (again, anyone who has a good description, please tell) The main developer of sAsync use to post to this mailing list, but I haven't seen him post in a fairly long while. So, if others are thinking about using SQLAlchemy with Twisted, let's discuss it more. Thanks very much, Alex

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[Twisted-Python] Twisted Hosting and Twisted in the Cloud
by Duncan McGreggor 14 Jul '08

14 Jul '08

Hey everyone, Divmod's been talking to various hosting companies about potential Twisted deals (and maybe even support). I wanted to get a gauge of people's level of interest in the services we've been discussing. We're currently looking at the following options: * Dedicated hosts, with Twisted libs pre-installed on them * Virtual hosts/"slices" with Twisted libs pre-installed on them * Clouds that support uploading and running Twisted apps * Potential support contracts where Divmod engineers provide high-level assistance for paying customers * Becoming a reseller and offering these services directly through Divmod I've been approached privately by a few developers who use Twisted in their projects at home and at work with questions about Twisted hosting. They've been interested to know if 1) Divmod does Twisted hosting, 2) anyone provides "out of the box" support for Twisted, and 3) who we recommend. I know that as the years pass, I have less and less time to manage my own systems responsibly. After 6 years, I'm closing down my colocated boxes. When Twisted makes it to the cloud, I'll close down my virtual hosts, too. I just don't have the time any more. All I need is reliable uptime for my apps (most of them are just sites with dynamic content). How many others on these lists feel that they would benefit from the ease of pre-installed Twisted and/or support for Twisted apps in the cloud? If you do, what kinds of apps (that you are currently running) do you want to be able to run in such environments? Simple web sites? DNS servers? Game servers? Chat applications? Web/data services apps? And lastly, what hosting companies are your favorites? Where would you be happiest, if they supported Twisted? Would you consider switching to a hosting provider that *did* support Twisted? Looking forward to hearing the people speak, d

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[Twisted-Python] AMP compliance tests
by Jonathan Lange 10 Jul '08

10 Jul '08

Hello all, Where can I find a set of automated tests that check that a particular AMP implementation is complete? I seem to recall someone on #twisted mentioning that they were working on such a suite. thanks, jml

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[Twisted-Python] Bloody Twisted VFS
by Andy Gayton 10 Jul '08

10 Jul '08

Hey guys, I'm really keen to get twisted.vfs to a stable point that is acceptably releasable. There's 6 tickets to knock off to get it to this state: This ticket will give an easily runnable vfs server, which'll be useful for experimenting with vfs as it is worked on: * http://twistedmatrix.com/trac/ticket/2821 This ticket ports the backend vfs interface to be firstly async, and also, not quite so lame: * http://twistedmatrix.com/trac/ticket/2815 Then we can port the 3 currently supported protocols over to use the new backend interface: * http://twistedmatrix.com/trac/ticket/2816 * http://twistedmatrix.com/trac/ticket/2817 * http://twistedmatrix.com/trac/ticket/2818 And finally once everything is ported, there can be a good clean up: * http://twistedmatrix.com/trac/ticket/2819 Exarkun also has some good suggestions for #2815. I've gone ahead and fixed the ones mentioned - but this is defining an interface - which isn't something to lock into lightly. As he says: 'What these interfaces should actually say is still an open question, I think. This would probably benefit from some real-time conversation with various interested parties involved. You've probably already noticed IFTPShell which is one take on this interface (it's not exactly the same shape, but many of the ideas apply here).' is very reasonable. Just before the first .au sprint I put a bit of time into this - and conch's IConchUser interface seemed to be a better base for vfs than IFTPShell - but this is something that could use more discussion. I've quit my job in LA that's sucked up all my life for the last 2 or so years and I'm now on a road trip around the US. I've hauled up in vermont for the week to catch up on a bunch of stuff - top of the list is to try and get vfs up to scratch finally. I'm planning to be in the Massachusetts area next week - again for around a week. If anyone is available to meet up and hash this out, that'd be awesome. It feels like if we can hit #2815 on the head, the rest will fall into place. Therve has been awesome at chugging through previous vfs stuff - porting protocols to use the agreed upon backend interface should be straight forward. cheers, Andy.

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[Twisted-Python] [SIP]
by Rémi BUISSON 07 Jul '08

07 Jul '08

Hi everyone, I didn't succeed in using twisted.protocols.sip ? Do you have a simple example for me ? It will be very nice ... Thanks in advance !

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Re: [Twisted-Python] Returning a DeferredList?
by Terry Jones 01 Jul '08

01 Jul '08

>>>>> "Nathan" == Nathan <nathan.stocks(a)gmail.com> writes: Nathan> I regularly use the return values of deferreds to simulate Nathan> synchronous behaviour like this: [snip] Nathan> So now I'm trying to do the same thing with DeferredList's, but Nathan> apparently the semantics aren't the same. Here's some actual Nathan> runnable sample code trying to use the DeferredList: Hi Nathan You're not using deferreds properly. In the simple/typical case, when you call a function that returns a deferred, you will want to add (at least) a callback to that deferred. The callback then gets called with the value that is being passed down the callback chain. Change your code to the below and it works. Your original code appears to work only because you're testing a deferred result in a Boolean context, which takes you to the true part of your if. You need to add call/errbacks to the deferred there too. Terry --- from twisted.internet import reactor, defer def callback_function(results): return "(--> This is the value that I want to get into retval! <--)" def make_a_list(): deferred1 = defer.Deferred() deferred2 = defer.Deferred() dl = defer.DeferredList([deferred1, deferred2]) dl.addCallback(callback_function) deferred1.callback('one') deferred2.callback('two') return dl def test(): def cb(val): print "retval is:", val make_a_list().addCallback(cb) reactor.callWhenRunning(test) reactor.callLater(2.0, reactor.stop) reactor.run()

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Re: [Twisted-Python] Returning a DeferredList?
by Terry Jones 30 Jun '08

30 Jun '08

>>>>> "Nathan" == Nathan <nathan.stocks(a)gmail.com> writes: Nathan> On Mon, Jun 30, 2008 at 4:20 PM, Terry Jones <terry(a)jon.es> wrote: >> You're not using deferreds properly. In the simple/typical case, when you >> call a function that returns a deferred, you will want to add (at least) a Nathan> I don't think that's true. Jean-Paul was the one who told me to do Nathan> it that way in the first place: Nathan> http://twistedmatrix.com/pipermail/twisted-python/2008-April/017304.html Sorry, but that doesn't seem related - you may have misinterpreted what Jean-Paul was saying. Nathan> If your theory was true, I would be getting garbage everywhere I Nathan> return (and use) complicated objects, and I'd be getting True Nathan> everywhere that I return booleans. I don't fully understand this last sentence. Try this: from twisted.internet import defer d = defer.Deferred() if d: print 'hey hey hey' Python treats the deferred as true here. Exactly the same goes for your original code: def check_db(): d = {some db query that returns a deferred} d.addCallback(handle_db_result) return d def main_func(): if check_db(): # This eventually returns True or False # Do some stuff else: # Do some different stuff The return result of check_db is a deferred. If you test it with an 'if' it's always going to be true. If you do this def main_func(): d = check_db() print d if d: # Do some stuff else: # Do some different stuff You'll see that d is a deferred. In both code examples you sent (the pseudo and the working) you are not treating the return value of a function that returns a deferred as a deferred. In one example you're testing it in an 'if' and in the other you're printing it. You need to add a callback in both cases. Terry

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