Mailman 3 September 2008 - Twisted

[Twisted-Python] Asking about architecture advice
by Mael Le Lannou 03 Sep '08

03 Sep '08

Hello, I'm a bit lost with api. I'have to create a web application that allow this : -1 server -Some clients -Server listen on server_ip:port_x for client datas -Client listen on client_ip:port_x for server datas Server and client can have initiative into sending data, that's my trouble and i don't know what transport to use. can someone help me please Thanks a lot

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[Twisted-Python] license / copyright questions about Twisted Perspective Broker client
by A 02 Sep '08

02 Sep '08

Hi, After looking around for the last 6 months for an Actionscript 3 library that would work as a client for use with Twisted Perspective Broker , and hoping someone more skilled than myself would get around to creating one, I decided to get the ball rolling. It currently works as a client for the example here. http://twistedmatrix.com/projects/core/documentation/howto/pb-cred.html#aut… There is a long way to go. . . but it's a start. I aim to release the library under the same license as Twisted (MIT) but I'm wondering about some of the details. Since all I have done is just ported the original Twisted code from Python to Actionscript what does that mean in terms of copyright and credits ? Should I give credit in every file according to original author ? I still have most of the original doc strings in my version - am I allowed to use those ? There are also sections where I have the original python code commented out (as a guide to what still needs to done). I can't really be arsed to delete all that while it's still in heavy development. Is that a problem ? Would I have to put the credits for the code in each snippet ? I have created a Google code project and will get the code up there as soon as I have got the paperwork in order. Cheers, Al.

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[Twisted-Python] How does the pollreactor work?
by Rodney Lott 02 Sep '08

02 Sep '08

Hi, there. I have been trying to figure out how to use the twisted.internet.pollreactor so that I can use it to monitor a Linux named PIPE (i.e. a FIFO created using mkfifo()). I tried without success to Google some examples but I couldn't find anything. Now, for a simple TCP server, the setup looks something like this (i.e. like the QOTD example in the documentation): from twisted.internet.protocol import Protocol, Factory from twisted.internet import reactor class QOTD(Protocol): def connectionMade(self): self.transport.write("An apple a day keeps the doctor away\r\n") self.transport.loseConnection() # Next lines are magic: factory = Factory() factory.protocol = QOTD # 8007 is the port you want to run under. Choose something >1024 reactor.listenTCP(8007, factory) reactor.run() So, the TCP type of reactor has something that tells it to listen to port 8007 and use some form of factory or object to take care of things when a connection occurs. As far as I can guess, I would need to do some steps like this (NOTE: using mixture of real and pseudo code): from twisted.internet import pollreactor pollreactor.install() <create a FileDescriptor object using /tmp/myfifo, maybe a class?> <use the reactor.addReader() call to register the FileDescriptor object with the reactor> <call reactor.run() (no loop) or call reactor.doPoll() (in a loop, processing returned events)?> Anyways, if anyone can give me some direction on how this reactor works. Ideally, I would assume that the relationships would be somewhat like this: Protocol analogous to FileDescriptor reactor.listenTCP analogous to reactor.addReader() reactor.run() would invoke the appropriate call in my FileDescriptor-based class to handle any read events on /tmp/myfifo Thanks in advance. -Rodney

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[Twisted-Python] twistd, does it use processes? Anything to watch out for?
by Gabriel Rossetti 02 Sep '08

02 Sep '08

Hello everyone, Just a little question about Twistd & the Application framework. I'm using the service collection app mechanism and I was wondering how Twistd handles it. Is there anything special to watch out for? Any differences in between running each server as a separate process (i.e. launching it from a diff term without twistd) and with Twistd? Does it spawn a process for each Service/Server? Thank you, Gabriel

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[Twisted-Python] fileReceive in msn.py
by Andrey 01 Sep '08

01 Sep '08

Hello anyone able to get the fileReceive() in the msn.py working? I tried many times but it keep lossing connection to the server everytime after the confirmation is sent -fileInvitationReply() any help or couple lines of sample code will be appreciated Andrey K

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[Twisted-Python] Processes in Twisted, only possible to run external prog?
by Gabriel Rossetti 01 Sep '08

01 Sep '08

Hello everyone, Here's the problem : I need to run a windows executable (proprietary, they won't give us the code) with wine to do some audio compression. I need to do different processing before (like calling sox, or parsing files, etc) so I wrote some functions that do everything. The windows exec creates a tmp file named "_tmp" in the working dir, so if I want to run several in parallel, I have to create a tmp dir with a unique name and change the working dir, if not then the multiple executions will overwrite each other's tmp file. So when I call my function that does the whole process, I first create a tmp dir, then pass it the tmp dir and the input filename, then once inside the function, it does an os.chDir() into the tmp dir and at the end it does it again to go back to the original current dir. Then I run that function in threads. The problem is that threads share the current dir : http://www.biais.org/blog/index.php/2007/01/23/19-python-threads-and-oschdir http://bugs.python.org/issue1367 so I need to use processes instead, as they each have their own current dir. The thing is that from what I understand, Twisted's process API is intended to be used with external executables only, correct? I wasn' t able to fins anything that allowed me to do stuff like I would using fork(). Should I just use python's fock() instead? Is it safe with Twisted? Thank you, Gabriel

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