Mailman 3 May 2009 - 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] 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] An XMPP client with SSL support
by Pedro Sanchez Sept. 18, 2009

Sept. 18, 2009

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] buildProtocol never called
by travis+ml-twisted＠subspacefield.org July 5, 2009

July 5, 2009

Hello, First let me introduce a piece of software I have written using Twisted: it's called dfd_keeper[1], and is a BSD/pf port of a generic concept I invented called the dynamic firewall daemon[2]. [1] http://www.subspacefield.org/security/dfd_keeper/ [2] http://www.subspacefield.org/security/dfd/ If you like the concept, please promote the idea; I think it's neat but there hasn't exactly been a groundswell of interest in it. In essence, it allows you to netcat or telnet to the daemon … [View More]

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[Twisted-Python] Twisted meetup/discussion at EuroPython?
by Terry Jones June 30, 2009

June 30, 2009

I was thinking it would be nice to have a Twisted interest group meetup at EuroPython (June 30 - July 2) http://www.europython.eu Would people be interested in attending? Does someone more qualified want to organize it? Are any Twisted developers planning to be at EuroPython? The submissions page http://www.europython.eu/submission/ has a category for Interest Group Meeting or Discussion. I'm thinking more along the lines of the former - that it would be nice to be better connected to other … [View More]

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Re: [Twisted-Python] Guidance on Proxy-type Application
by glyph＠divmod.com June 2, 2009

June 2, 2009

On 01:23 am, asb.bush(a)gmail.com wrote: >I have just started to look at the Twisted framework and would like to >put it >to use for a new project I am working on. Not being very familiar with >the >framework and fairly new to Python in general I would like to ask a >design/architecture question. (I have written similar applications in >C but >would prefer to start this in the right direction and not write Python >like >C.) Thanks for asking! I apologize … [View More]for the delay in my answer. I started writing up a simple example (attached) but was discouraged to find that it was 100 lines long and required too much explaining. Then I started documenting it and explaining every line but that was a very long, tedious message. So, it doesn't have much in the way of explanation; I hope you will find it useful regardless. >The application has the following model: >Many clients connect to the Application and prefer to leave the >connection >open. They will send messages across this connection. They will >expect to >get a message back at some point later, they do not wait for a response >(async). The clients are already coded (legacy) and just need to send >their >proprietary protocol to the new Application (written using Twisted). This is *almost* a FAQ. At least, you may find this to be a useful answer: <http://twistedmatrix.com/trac/wiki/FrequentlyAskedQuestions#HowdoImakeinput…> >The Twisted application will take the data from the clients and do some >transformation on it then send the message on to another server (3rd >party). >This connection to "another" server must be a single connection, not >one >connection per client. This connection should also be persistent and >not >opened/closed for each client message sent. Ideally if the 3rd party >server >is down then I would also not accept client connections as the messages >are >time sensitive and should not be stored and forwarded. At some point >the 3rd >part will send a message back and the Application will route it back to >the >original source. Basically request/reply pattern. The example that I've attached does basically this. Run it and then run 'telnet localhost 4322', and type some lines; you will see that they are transformed and echoed back to you, both by the proxy and by the protocol being proxied. At a high level, the answer to your question is so simple that it's hard to express. Basically, you just need to have all the relevant objects having references to each other, and calling methods to achieve the desired effect. The less magic, the better. More precisely, you need an object responsible for managing your outgoing connections to your legacy server, so that it can handle disconnection and reconnection, queueing messages and so on. Then you need your proxy server factory to hold a reference to that object, so that it can create references from each proxy server protocol connection object to the connection manager. This is related to another recent thread - you can see my message in that thread here: http://thread.gmane.org/gmane.comp.python.twisted/18377/focus=18385 >I have been reading through the archives and the twisted docs and have >also >looked over the Hex-dump port-forwarding recipe but not found anything >that >explains how to use twisted for this model. Hex-dump is close but >opens/closes the connection to the server on each client connection. I'm not sure why hex-dump port-forwarding is particularly relevant to this example. Is it just because this is an application that connects from one host to another? >I am thinking that there will be two Factories [and two protocols: 1) >for >clients and 2) for 3rd party]. I am not sure how to best establish >both the >listening factory and the client to 3rd party factory. Once they are >established what is the preferred way in Twisted to pass a message from >one >protocol to another? This part of your question is almost exactly the FAQ I mentioned above :). To reiterate that answer, you just need to have references between objects, and call methods on the objects you want to do stuff. If you have a client connection object, just get a reference to that from the relevant server connection object and call methods on the client object to emit messages on the client protocol, handling any responses appropriately. Deferreds can help with that latter part. It is always better if you can establish that reference as simply as possible; for example, by passing parameters to the __init__ of various classes. Again, for reasons that have nothing to do with Twisted specifically, it's a bad idea to try to establish these references by having global variables floating around. Here's a very very simple example of the "good way" to propagate some data to protocol instances that need it: class MyProtocol(Protocol): def __init__(self, data): self.data = data class MyFactory(Factory): def __init__(self, data): self.data = data def buildProtocol(self, addr): return MyProtocol(self.data) reactor.listenTCP(8765, MyFactory("some data")) and here's a simple example of a really bad way (don't do this!): class MyProtocol(Protocol): def connectionMade(self): self.bleh = bleh bleh = "some data" f = Factory() f.protocol = MyProtocol reactor.listenTCP(9876, f) Even in C, I'm pretty sure it's better style to pass structures to functions than to abuse piles of local variables :). I only illustrate this bad style here because it seems to be a common antipattern. The Protocol class itself doesn't take any parameters to __init__, and Twisted's users don't always realize that protocols and factories and so on are just regular objects, with no special rules; they just get methods called on them by the reactor. >Any pointers or sample code that you can offer is greatly appreciated. >I >would really like to cook this in Twisted and not go back to the C way. Based on what you've said so far, I think you're basically on the right track. Good luck! [View Less]

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[Twisted-Python] Reactor callback from the wrong thread
by Lars Ivar Igesund June 2, 2009

June 2, 2009

Hi! I have an issue where the reactor calls the callback from a different thread than the one the reactor is running in. The usecase is as follows; We are running tests using PyFit (Fitnesse), and where some of the tests depends on receiving SNMP traps in the background. So at the start we start a trap deamon defined as class TrapDeamon(Thread, netsnmp.Session) We use the pynetsnmp.twistedsnmp package and has a run() method that looks like this def run(self): self.awaitTraps(self.… [View More]

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[Twisted-Python] Twisted Question
by Brandon McGinty June 1, 2009

June 1, 2009

Hi All, I just subscribed to this list, after viewing tons of documents about twisted, factories, and all the like. Here is the situation. I am trying to design a bridge between twisted.web and twisted.words.protocols.irc. I have read a lot about using factories, and communicating with a central "program class" like in the finger tutorial. However, I can not figure out how to communicate between two running protocols. Here's an example: User connects to web server. Irc client connects to … [View More]

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[Twisted-Python] offer of adding IRCD support to words.protocol.irc
by Patrick Thomson June 1, 2009

June 1, 2009

I'm currently about to embark on building something from twisted which has an IRCD, and I have found the capacity to run IRC servers is lacking, in contrast to the excellent client/bot backend code. I've found several other twisted projects already implement an IRCD, and whilst I'm reinventing the wheel, I may as well go the extra mile to get my code suitable for inclusion. I wouldn't be asking for a lot, just some general guidelines (e.g. I know my patch probably won't be accepted without … [View More]

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[Twisted-Python] Weekly Bug Summary
by exarkun＠twistedmatrix.com May 31, 2009

May 31, 2009

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[Twisted-Python] Twisted for Nokia S60 Platform
by Mustafa Sakalsiz May 30, 2009

May 30, 2009

Hi all, I am wondering if somebody has tried to run the twisted on nokia's s60 platform. I am not expecting twisted operate with full functionality, but I will be glad to hear about it if there are some efforts. I also wanted to be involved in such an effort. S60 platform already supports python 2.5.4 core and openssl. Thanks in advance. Saki

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Re: [Twisted-Python] Twisted for Nokia S60 Platform
by glyph＠divmod.com May 30, 2009

May 30, 2009

On 08:24 am, sakalsiz(a)gmail.com wrote: >I am wondering if somebody has tried to run the twisted on nokia's s60 >platform. I am not expecting twisted operate with full functionality, >but I >will be glad to hear about it if there are some efforts. I also wanted >to be >involved in such an effort. > >S60 platform already supports python 2.5.4 core and openssl. Unfortunately I haven't done this, but please let us know if you manage to succeed! It would be cool to … [View More]

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[Twisted-Python] ESMTP extension
by Nicolas Toper May 30, 2009

May 30, 2009

Hi, I am using SMTP-AUTH with Twisted. I have extended smtp.mail to handle LOGIN and PLAIN on the server side (the version I have handles only CRAM-MD5). I am adding currently DIGEST-MD5. Do you want a patch? If yes, what is the best way to submit a patch (I could not find it on the wiki)? Best, Nicolas http://www.deviant-abstraction.net

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Re: [Twisted-Python] reactor.stop() and deferToThead
by Thomas Jakobsen May 29, 2009

May 29, 2009

Thanks for the quick answers! Explicitly making stuff2() return as soon as it discovers that the reactor has stopped solves the problem. Regards, Thomas

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[Twisted-Python] reactor.stop() and deferToThead
by Thomas Jakobsen May 29, 2009

May 29, 2009

Hi It seems that things being deferredToThread continue to run even though reactor.stop() is called. Output from the example below is: stuff1 finished; stopping reactor stuff2 finished Is there a way to abort the remaining execution of stuff2 in this case? It would be handy if, say, some exception happens in in stuff1 that causes the execution of the remaining stuff2 to be meaningless. Kind regards, Thomas --------------------------------------------- from twisted.internet.threads import … [View More]

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[Twisted-Python] Automatic test for Twisted
by Juanjo Conti May 29, 2009

May 29, 2009

Hi, is there a way to write sort of unittest for Twisted and run them? -- Juanjo Conti

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[Twisted-Python] Twisted protocol as Django data source
by Dan May 29, 2009

May 29, 2009

Hi all, I have an application written in Twisted which multiplexes data from a variety of pieces of specialized hardware, and I'd like to make the live stream of this information viewable through a webpage. Unfortunately, on our server, port 80 is already taken by an Apache + mod_python + Django stack with which we host a number of webpages. Ideally, I'd like to be able to write a quick Django app in which just import my Twisted protocol, connect to my network, and start streaming … [View More]

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[Twisted-Python] Guidance on Proxy-type Application
by Aaron Bush May 28, 2009

May 28, 2009

I have just started to look at the Twisted framework and would like to put it to use for a new project I am working on. Not being very familiar with the framework and fairly new to Python in general I would like to ask a design/architecture question. (I have written similar applications in C but would prefer to start this in the right direction and not write Python like C.) The application has the following model: Many clients connect to the Application and prefer to leave the connection … [View More]

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[Twisted-Python] Upcoming Sprint
by glyph＠divmod.com May 28, 2009

May 28, 2009

Hi folks, It's getting to be about the time for another Twisted sprint. Rumor has it that long-time Twisted hacker Kevin Turner will be in Cambridge the weekend of the 30th-31st, so we'll be hosting a sprint one of those days. If this rumor is true, I'd appreciate it if our esteemed visitor could give us some feedback as to which day he'll be free :).

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[Twisted-Python] twistd -y and 'adbapi.ConnectionPool.runWithConnection'
by Joe Steeve May 28, 2009

May 28, 2009

Hello all, I am doing a 'runWithConnection' call from the 'startService' of a service.Service. In the callback, I startup more services based on the results of the 'runWithConnection' and attach them to the main application object. This works fine when I start the script with 'twistd -noy'. However, when I want to start it as a daemon using 'twisted -y', the runWithConnection does not seem to work. The thread simply does not start. What could be wrong? The database is 'PostgreSQL'. I am … [View More]

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[Twisted-Python] ESMTP: method DIGEST-MD5 and IP authenticator
by Nicolas Toper May 27, 2009

May 27, 2009

Hi, I am going to add in the ESMTP class these two authentications methods. Are you interested in a patch? Best, Nico http://www.deviant-abstraction.net

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[Twisted-Python] Processpool recommendation (for scaling to multiple CPUs)
by Attila Nagy May 27, 2009

May 27, 2009

Hello, Is there any efficient built-in machinery in twisted for running a (TCP, UDP or unix domain socket) service in a connection multiplexer->worker processes manner? Or if there isn't, what is the recommended way of doing this? (any examples maybe?) I've got some CPU scalability issues (the application became CPU bound, but there are a lot more CPUs, which can't be used because of the uniprocess nature), threading is not a solution, so the next logical move could be starting … [View More]

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[Twisted-Python] Twisted at UDS Karmic
by Esteve Fernandez May 25, 2009

May 25, 2009

Hi all, I know quite a few Twisted developers love Ubuntu, so... is any of you here in Barcelona for the Ubuntu Developer Summit for Karmic Koala? I'll be attending some sprints, primarily about Ubuntu Server, messaging, cloud computing, etc. Cheers.

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