Mailman 3 October 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] An XMPP client with SSL support
by Pedro Sanchez 18 Sep '09

18 Sep '09

Hello, I have a sample XMPP client with the following structure: from twisted.words.protocols.jabber import client, jid from twisted.internet import reactor ... factory = client.basicClientFactory(myJid, myPasswd) reactor.connectTCP(host,5222,factory) reactor.run() It works well, I can connect to the XMPP server. But I would appreciate if some one could give me some hints on what's required to get the client to connect using a secure SSL link. Thanks, -- Pedro

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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] Syslog Listener UDP
by Marc Byrd 16 Dec '08

16 Dec '08

Hi, I would like to build a syslog(udp port 514) listener in twisted. The goal is to make it compatible with syslog and syslog-ng, which may be configured on a "client" to send log entries (as they occur) via udp (fire and forget) to a remote server (my twisted server). Is there already something out there that would do this or that would be a good start? Thanks, Marc

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[Twisted-Python] Event notification and general RPC in Twisted...
by Blair Bethwaite 12 Nov '08

12 Nov '08

Hi all, I'm thinking about using Twisted to rewrite some communications in a Grid computing application. E.g.: [JobServer]1 ---------- *[Proxy]1 ----------- *[Agents] Agents get jobs, report status, results, etc through Proxy to JobServer. Agents are often distributed across a private network that has no external interface, hence the proxy, which is run on a machine between the private network and internet. Also, the proxy may do some caching/queuing of particular messages - especially where the number of agents behind it is large. What we have at present is a TCP socket server however we're starting to hit scalability issues and on top of that our future plans necessitate a notification framework. I've been digging around on twistedmatrix.com and in the book but so far am having trouble finding any guidance or the level of detail that tells me whether Twisted has what we need, some bits of which are: - we'd like to use a persistent stream/connection, at least between the JobServer and Proxy (traffic frequency will be reasonably high) - it needs to be interoperable with java (is there PB for java?) - each end of the connection should be able to register for and get notifications from the other (e.g. Agent gives a heartbeat, JobServer tells Agent to stop) - sometimes the Proxy might be behind a firewall and only able to connect out, we need to be able to use that connection to go back as above - we want to dynamically configure streaming connections between Proxies Hopefully that's enough context for you to point at modules and tell whether these are appropriate questions: Can I re-use a TCP stream for multiple XML-RPC or PB operations? If so, would it make sense to have the client (e.g. Proxy or Agent) initiate the connection and then make a rpc (e.g. "notify me of anything relevant") to the server which would eventually return when something relevant came along - triggering a callback in the client... wash, rinse, repeat? Sorry if I'm overlooking something that already answers this, it doesn't seem like something too unique to have not been asked before... Regards, -Blair -- In science one tries to tell people, in such a way as to be understood by everyone, something that no one ever knew before. But in poetry, it's the exact opposite. - Paul Dirac

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Re: [Twisted-Python] Passing arguments while running a twistd application
by Terry Jones 03 Nov '08

03 Nov '08

>>>>> "Adriano" == Adriano Marques <py.adriano(a)gmail.com> writes: Adriano> I have a twisted application, which formely was run with command Adriano> line arguments which were used during runtime, eg: I was passing Adriano> the path to the log file as argument. Then, I decided to make my Adriano> app run through twistd as a tac file but then I'm not able to pass Adriano> command line arguments anymore. Is there any way to overcome this Adriano> issue? I also ran into this, and asked for some way to pass args but got told (paraphrasing, from memory) that that's not the way to do it... The way to do it seems to be to convert your application to be a Twisted plugin. It's not too hard. Then you make sure there's a twisted/plugins dir accessible from your path (with no __init__.py files in/under it). Then twistd will find your plugin (just run twistd with no options and you should see your plugin name listed at the bottom among the commands). Then you can add options processing by subclassing the Options class in twisted.python.usage. Sorry to be so terse - no time. The above does work though, and seems to be the Twisted way. Rough (untested) guideline code below. Terry --- from zope.interface import implements from twisted.python import usage from twisted.plugin import IPlugin from twisted.application.service import IServiceMaker from ???? import myservice class Options(usage.Options): optFlags = [ ['verbose', None, 'If True, be verbose.'], ] optParameters = [ ['port', 'p', '0', 'The port number to listen on.'], ] class MyServiceMaker(object): implements(IServiceMaker, IPlugin) # The tapname will appear in the output of twistd when run with no args. # Use twistd -n my-plugin-name # to invoke it. tapname = 'my-plugin-name' description = 'My snazzy service.' options = Options def makeService(self, options): return myservice( options['port'], options['verbose']) serviceMaker = MyServiceMaker()

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[Twisted-Python] Passing arguments while running a twistd application
by Adriano Marques 31 Oct '08

31 Oct '08

Hello folks, I have a twisted application, which formely was run with command line arguments which were used during runtime, eg: I was passing the path to the log file as argument. Then, I decided to make my app run through twistd as a tac file but then I'm not able to pass command line arguments anymore. Is there any way to overcome this issue? I'm running something like this: $ twistd -y my_twisted_script.tac my_program_arguments Then twistd is returning the following: <twistd_help /> twistd: Unknown command: my_program_arguments Cheers! -- Adriano Monteiro Marques http://adriano-marques.blogspot.com http://www.umitproject.org http://www.pythonbenelux.org "Don't stay in bed, unless you can make money in bed." - George Burns

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[Twisted-Python] Change A UDP based server to TCP based
by Peter Cai 30 Oct '08

30 Oct '08

Hi all, I found twisted have a module called SIP which implements parts of RFC3261, Session Initial Protocol. As I am going to write an experimental SIP server, this module seems to be very useful for me. But, one problem : it's based on UDP. I skimmed the code and I think maybe I can "Cut and Copy" some code of this module to implement my own TCP SIP server. But the idea of "cut and copy" is really annoying. What will you do in my situation? BTW, if you are going to write a protocol which supports both UDP and TCP, what is your design going to be like?

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