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. ______ __ __ _____ _ _ | ____ | \_/ |_____] |_____| |_____| |_____ | | | | @ 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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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 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 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 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 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 4, 2009

July 4, 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 process and issue text-like commands that alter your firewall rules. You can think of it as a "shell" for the firewall, and it can do neat things like create firewall rules that expire automatically after a period of time and so on. The problem I'm having is this; I upgraded my firewall from OpenBSD 4.2 or so to OpenBSD 4.5, and now I'm working with newer versions of all the software including Twisted. The program works fine normally, and can run in the background, but if I invoke a daemonize() routine that turns it into a network daemon, it refuses to serve incoming TCP connections. Actually the TCP connection is made, but the software never responds to it. Specifically, my twisted.internet.protocol.Factory instance is created, but buildProtocol is never called. Before I dive deeply into debugging the software, I thought I'd ask if anyone knew off the top of their head any reason why Twisted might not act the same if it was daemonized (no controlling terminal, no stdin/out/err, forked as a background process). Thanks! Travis H. -- Obama Nation | My emails do not have attachments; it's a digital signature that your mail program doesn't understand. | http://www.subspacefield.org/~travis/ If you are a spammer, please email john(a)subspacefield.org to get blacklisted.

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[Twisted-Python] Twisted meetup/discussion at EuroPython?
by Terry Jones June 29, 2009

June 29, 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 Twisted programmers in Europe, to put a face to some of the names on the mailing list / IRC, etc. Terry

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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 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!

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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.hostPort) twistedsnmp.updateReactor() reactor.run(installSignalHandlers=0) In the callback from the reactor, we get the pdu of the trap which is then sent into a trap buffer. On the PyFit side of things, we execute some commands, and at some points we need a confirmation from a trap before we can continue. This is done by waiting on a queue (Queue.Queue). The trap buffer has a register over queues and awaited trap OID's, and when the correct one is added to the buffer from the reactor callback, it is put onto the queue, the test rejoice, and continues. However, I noticed that fairly often (say every 3rd wait), the wait timed out even though I had seen the trap on wireshark. So I improved the logging, and noticed that in the cases where the wait timed out, the reactor callback for the trap I waited for happened in the main thread (at least main thread id is reported by python logging), and thus did not appear until immediately after the wait had failed and unblocked. Most of the trap callbacks (both before and after these misses) happens in the correct (reactor) thread though. What can cause this and how may I debug it? AFAIK, PyFit does not use twisted or threading at all, and we only have two simple background threads our selves in addition to the one running the trap deamon. Best regards, Lars Ivar Igesund

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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 irc server User clicks on search link, and enters query. A command, along with that query, is sent to irc server via irc client. Response is returned, processed, and sent to the page that is the result of submiting that form. Process continues until user clicks log out, where in the irc client disconnects. Any help anyone can give me is greatly appreciated. Thanks, Brandon McGinty -- -- Brandon McGinty Email:brandon.mcginty@gmail.com Tel:(602)-904-6548 SMS:(602)-904-6548 Skype:brandon.mcginty MSN:brandon_mcginty@hotmail.com

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