Mailman 3 July 2003 - Twisted

[Twisted-Python] Providing perspective-dependent client-side information to a pb.RemoteCache object
by Patrik Blommaskog 01 Aug '03

01 Aug '03

Hmm, I find it hard to describe it as a short subject, but here's what I seek to do: On the server, I have the structure: class A(pb.Cacheable): [...] class B(pb.Cacheable): def __init__(): self.stuff = A() # This attribute gets replicated. And on the client side, there are the corresponding pb.RemoteCache classes. When an instance of B is replicated, a client-side A gets instantiated and its setCopyableState is called, and the client-side B instance gets its reference to it. So far, so good. But when the client-side A is created and its state has been set, I also want to perform some other processing which requires references to other parts of the client. I would prefer not to make these parts into globals. For example, it could be dependent on the client-side perspective it communicates through, which would be handy if the client connects to multiple servers. I'd like to know if there is an accepted idiom for supplying this? For example, I believe it would have worked if the setCopyableState received the perspective as a third parameter.

1 0

[Twisted-Python] Re: Twisted - Python 2.3 - Windows
by Cory Dodt 01 Aug '03

01 Aug '03

>Subject: [Twisted-Python] Twisted - Python 2.3 - Windows > >Hi, > >anyone who knows when the first Python 2.3 build of twisted for windows >will be available? Which version will it be? > >I tried to build it myself but got into trouble. I first installed >Cygwin and then tried 'setup.py build --compiler=mingw32' as per >documentation, but I got an error message that Python itself is build >with Visual Studio 6. >I don't feel building python myself and I don't have VS6. > > I'm with you man, I don't feel like building Python myself either. I have asked the appropriate list (http://mail.python.org/pipermail/distutils-sig/2003-July/003333.html ) about this problem. I also tried using distutils from CVS instead of the bundled copy with Python 2.3, and no luck. There won't be an official Python 2.3 build of Twisted for Windows until this is resolved, as I don't have MSVC and don't intend to buy a copy. mingw should work. In the meantime, you should know that you can get by without the extensions. Just do $ python setup.py install --skip-build You won't get cbanana or _c_urlarg, the only extensions built for windows.

4 4

[Twisted-Python] Twisted and Python 2.3
by Thomas Heller 31 Jul '03

31 Jul '03

Trying to run my code under Python 2.3, I get these warnings: C:\tss5\components\fpanel\prog\..\..\_Pythonlib\fpgui\ctgui_reactor.py:113: DeprecationWarning: Foolish capitalist! Your opulent toilet will be your undoing!! log.logOwner.own(fd) C:\tss5\components\fpanel\prog\..\..\_Pythonlib\fpgui\ctgui_reactor.py:127: DeprecationWarning: The proletariat is victorious. log.logOwner.disown(fd) What do they mean? I have built and installed twisted 1.0.6 under Windows. Thomas

2 3

[Twisted-Python] PB - detecting loss of connection
by Richard.Townsend＠edl.uk.eds.com 31 Jul '03

31 Jul '03

I've been experimenting with PB. I have two applications developed from examples pb3server.py and pb3client.py The client uses pb.getObjectAt() to get a reference to the server's pb.Root derived object. It then calls a remote method on that object to send a pb.Referenceable object to the server. The idea is that the server can then call a method on the pb.Referenceable object to notify the client(s) whenever a significant change of state occurs. This works OK. If the client terminates, the server can trap pb.DeadReferenceError, so that is not a problem. However, if the server terminates (e.g. by SIGKILL) the client is not aware that it will not receive any more updates. Apart from periodically calling pb.getObjectAt() to see if the server is still running, is there a way that the client can automatically detect if the server has been terminated? thanks for your help -Richard

2 1

[Twisted-Python] Didn't register my copy of Twisted!?!
by Nicola Larosa 31 Jul '03

31 Jul '03

-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 Sorry to spoil the party, but... is twisted.python.register supposed to be a joke, or what? :^) If so, I'm not sure I completely got it... I'm particularly concerned with the ominous "import socket" contained within. ;^) - -- "It seems like Zope has done a dance with Twisted but still hasn't asked it out on a date." Paul Everitt Nicola Larosa - nico(a)tekNico.net -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.2.2 (GNU/Linux) iD8DBQE/KPePXv0hgDImBm4RAieDAJ9RpJ2p8Ng3GQ53SD4mxE/qYkCeSwCgqzxq O7EqvgRVX5DPBUyId7A4YIA= =05t1 -----END PGP SIGNATURE-----

2 1

[Twisted-Python] how to drop connection
by Michael Porter 31 Jul '03

31 Jul '03

Hi, I'm trying to close down a web server (wihout closing the application) but am having problems closing already established connections. I'm using port.stopListening() which closes the port and stops the factory but this doesn't seem to close already established connections. So, if I then get another request from an established connection, an attempt is made to service the request. This causes a few problems including "AttributeError: Site instance has no attribute 'logFile'" from HTTPFactory because it deleted its logFile attribute when stopFactory was called. Does anyone know how I can close these established connections? Thanks, Mike.

4 4

[Twisted-Python] adbapi weirdness
by Steve Freitas 31 Jul '03

31 Jul '03

Hi all, Here's the latest thing I can't figure out. If I do this and make an XML-RPC call to dbtest(), it runs fine: class takeOne(xmlrpc.XMLRPC): def __init__(self): self.dbpool = adbapi.ConnectionPool("pyPgSQL.PgSQL", \ host='127.0.0.1', user='postgres', database='template1') self.db = adbapi.Augmentation(self.dbpool) self.prefs = Env(self.db) def xmlrpc_dbtest(self): result = self.db.runQuery("select * from prefs") return result def xmlrpc_listPrefs(self): return self.prefs.prefs class Env: def __init__(self, db): self.db = db self.prefs = self.db.runQuery("select * from prefs") return def main(): from twisted.internet.app import Application app = Application("xmlrpc") r = takeOne() app.listenTCP(7080, server.Site(r)) return app application = main() if __name__ == '__main__': application.run(save=0) But a call to listPrefs() hangs until I make another, concurrent request to dbtest(), at which point it comes through. Then if I try listPrefs() again, it returns Fault 8002: Can't serialize output. Any ideas? I'm suffering from all kinds of this weirdness: It hangs, then it doesn't hang, then it returns properly, then it can't serialize from the same function that worked a moment before. :-( Thanks, Steve

3 5

[Twisted-Python] Twisted - Python 2.3 - Windows
by Rudy Schockaert 31 Jul '03

31 Jul '03

Hi, anyone who knows when the first Python 2.3 build of twisted for windows will be available? Which version will it be? I tried to build it myself but got into trouble. I first installed Cygwin and then tried 'setup.py build --compiler=mingw32' as per documentation, but I got an error message that Python itself is build with Visual Studio 6. I don't feel building python myself and I don't have VS6. TIA, Rudy

1 0

[Twisted-Python] Debugging client programs
by John Goerzen 31 Jul '03

31 Jul '03

Hello, I found the information at http://www.twistedmatrix.com/documents/howto/debug-with-emacs regarding debugging server-type programs (that run under twistd) with pdb and Emacs. Apparently twistd installs a special sigint handler when -b is specified. However, my program is a client program, and thus does not run under twistd, has no TAP, etc. What is the framework for enabling debugging for that? And could it be documented in the howto? Thanks, John

6 12

[Twisted-Python] Wrapping blocking code
by Justin Johnson 31 Jul '03

31 Jul '03

I have some code in my xmlrpc service that executes commands using process.py (http://starship.python.net/crew/tmick/). The service appears to block this code, thus only allowing one connection to get any work done at a time, at least while the commands are being executed. Should I be wrapping this up in a Deferred somehow to avoid blocking? Slowly but surely this is starting to make sense to me. Twisted rocks! Thanks. -Justin

7 18