Mailman 3 April 2004 - Twisted

[Twisted-Python] wxreactor
by darryl April 2, 2004

April 2, 2004

I tried to run /doc/examples/wxdemo.py And i get a window to pop up but no menu. does wxreactor work as advertised? Is anyone else having success? -darryl -- http://randomthoughts.vandorp.ca/syncato/WK/blog

5 8

[Twisted-Python] Perspective Broker and [WINSOCK] Connection reset by peer
by Justin Johnson April 2, 2004

April 2, 2004

I'm trying to track down a problem and I'm not sure if Twisted is involved or not. Here are the details. I administer Rational ClearCase. One task I do is removing repositories (a repository is called a VOB in ClearCase). If I am logged onto the machine locally I run the command "cleartool rmvob -f C:\VOBs\myvob.vbs". ClearCase uses RPC calls in some manner unknown to me for most of its operations (probably with this command too). So when I run the command, some RPC interaction probably takes place and then the VOB is removed. The command is being run on the server where the VOB exists, but I believe it still uses RPC, even if everything is local. I have been using Twisted, specifically PB, to help me administer these servers. The PB service has a method remote_rmvob that can be called remotely to remove a VOB. Sometimes this works, but other times I get the following error: [WINSOCK] Connection reset by peer cleartool: Error: Versioned object base "C:\VOBS\myvob.vbs" not deleted. cleartool: Error: Trouble removing versioned object base "C:\VOBS\myvob.vbs". If I retry the PB operation again and again, eventually it succeeds. On some servers it takes more retries than others to get a successful removal, but eventually it succeeds. If I run the command locally with no PB/Twisted involved I never get this error. So I've been doing some research on this WINSOCK error, trying to determine if it is being caused by the fact that I'm running the command via PB. The site http://frontier.userland.com/discuss/msgReader$173 has the following info: 10054 WSAECONNRESET -- Connection reset by peer. This occurs when an established connection is shut down for some reason by the remote computer. The following thread discusses a similar problem with rsync where the connection wasn't shutdown gracefully and a similar error occurred. http://lists.samba.org/archive/rsync/2001-October/000407.html http://lists.samba.org/archive/rsync/2002-April/002076.html Does anyone with more networking knowledge than me have any ideas on what might be causing this problem? All I have is fuzzy ideas in my head, like the command running in a ProcessProtocol might cause some problems, or PB closing the connection before some important thing happens, ... As you can see, it is very fuzzy for me. :-( Any help you can provide is appreciated. Thanks. -Justin

1 0

[Twisted-Python] Trivial bug in StandardIO.connectionLost()
by Sam Couter April 2, 2004

April 2, 2004

StandardIO.connectionLost() loses the reason for the lost connection. Trivial patch: Index: twisted/internet/stdio.py =================================================================== --- twisted/internet/stdio.py (revision 10451) +++ twisted/internet/stdio.py (working copy) @@ -106,4 +106,4 @@ def connectionLost(self, reason): """The connection was lost. """ - self.protocol.connectionLost() + self.protocol.connectionLost(reason) -- Sam "Eddie" Couter | mailto:sam@couter.dropbear.id.au Debian Developer | mailto:eddie@debian.org | jabber:sam@teknohaus.dyndns.org OpenPGP fingerprint: A46B 9BB5 3148 7BEA 1F05 5BD5 8530 03AE DE89 C75C

2 1

[Twisted-Python] Testing a mailman upgrade
by Christopher Armstrong April 1, 2004

April 1, 2004

I just upgraded mailman from 2.0.11 to 2.1.4; hopefully all went well! -- Twisted | Christopher Armstrong: International Man of Twistery Radix | Release Manager, Twisted Project ---------+ http://radix.twistedmatrix.com/

1 0

[Twisted-Python] Re: Using compiled C Library with Twisted?
by Christopher Armstrong April 1, 2004

April 1, 2004

This message is more appropriate for twisted-python(a)twistedmatrix.com, not twisted-web(a)twistedmatrix.com. > -------- Original Message -------- > Subject: [Twisted-web] Using compiled C Library with Twisted? > From: Jiannan Fu <jf(a)ypsilon.net> > To: twisted-web(a)twistedmatrix.com > > hi there, > i got the following problem: I have a set of compiled C files, providing > a API for a special encryption / decrytion of messages to be exchanged > over the internet, well documented and with a lot of programming > examples of how to work with it and its functions (in this case the > examples are all in C). Now i want to use it with twisted together, to > have all the advantages of twisted (especially the reactor instead of > threading, deferred and so on), but the C API to do the last step before > messages are send out. > > The C API should just play some kind of middleware between the tcp-ip > protokoll and the twisted server. Is it possible to extending twisted > with that library by "just import" them? > > Any kind of advice / suggestions would help You don't have to do anything special to get C libraries to work with Twisted; you'll have to create a Python-C binding for them, of course, and then you just import the binding and call the functions in it. Just call out to these functions to decode and encode chunks of data when you receive or send it. From the info you provided, that's all the advice I can come up with. -- Twisted | Christopher Armstrong: International Man of Twistery Radix | Release Manager, Twisted Project ---------+ http://radix.twistedmatrix.com/

1 0

[Twisted-Python] Closing PB Connections
by Justin Johnson April 1, 2004

April 1, 2004

I found some stuff on google about this but it still isn't clear to me what I need to do. I noticed that everytime I make a new connection via PB, the server has another ESTABLISHED connection between itself and the PB client box (via netstat output). Do I need to do something to close these connections? I connect as follows: class MyClient: ... def connectToServer(self, server): """Connect to the RatControl service """ factory = pb.PBClientFactory() reactor.connectTCP(server, pbPortNumber, factory) d = factory.login(credentials.UsernamePassword(self.username, self.password), None) return d def someMethod(self): ... d = self.connectToServer(server) d.addCallback(_cbDoSomething, arg1, arg2) Thanks. -Justin

1 0

[Twisted-Python] help ssh forwarding.
by Oisin Mulvihill April 1, 2004

April 1, 2004

Hi, I have a series of linux based internet kiosks at a variety of sites. I need to be able to connect back into the kiosk from the main server. However direct connections aren't possible as kiosks are behind there own router/firewall. The solution to this is to forward port 22 on the kiosk to a port on the server. I was thinking of just spawning the command "ssh -R11122:my_server:22 user@my_server" from the kiosk, when ever I need to connect to a machine. However I'm hoping to do this with twisted, since the kiosk app uses it already, and spawning the ssh command won't play well with twisted's event system. I decided to try and hack together a simple version of what I want to do, based on the example sshsimpleclient.py. I don't seem to be able to figure out how to forward from the server to the kiosk. My program (attached) just forwards from 11122 on the kiosk to 22 on the server which isn't what I want. Can anyone suggest what I'm doing wrong? Can twisted actually do this? Thanks in advance, om -- Oisin Mulvihill Engines Of Creation Email: oisin(a)enginesofcreationsoftware.com Email: oisin(a)enginesofcreation.ie Mobile: +353 868191540

2 1

[Twisted-Python] help ssh forwarding.
by Oisin Mulvihill April 1, 2004

April 1, 2004

Sorry If you get two of these, I sent the last one with the wrong email account. Hi, I have a series of linux based internet kiosks at a variety of sites. I need to be able to connect back into the kiosk from the main server. However direct connections aren't possible as kiosks are behind there own router/firewall. The solution to this is to forward port 22 on the kiosk to a port on the server. I was thinking of just spawning the command "ssh -R11122:my_server:22 user@my_server" from the kiosk, when ever I need to connect to a machine. However I'm hoping to do this with twisted, since the kiosk app uses it already, and spawning the ssh command won't play well with twisted's event system. I decided to try and hack together a simple version of what I want to do, based on the example sshsimpleclient.py. I don't seem to be able to figure out how to forward from the server to the kiosk. My program (attached) just forwards from 11122 on the kiosk to 22 on the server which isn't what I want. Can anyone suggest what I'm doing wrong? Can twisted actually do this? Thanks in advance, om -- Oisin Mulvihill Engines Of Creation Email: oisin(a)enginesofcreationsoftware.com Email: oisin(a)enginesofcreation.ie Mobile: +353 868191540

3 4

[Twisted-Python] Can I connect multiple class instances to 1 Twisted factory?
by Kaleb Brasee April 1, 2004

April 1, 2004

Is this even possible? I'm designing a simple chat and game client/server as an intro to Python, and it would be nice to represent the different interfaces (public chat room, private chat rooms, game instances) as totally seperate classes and show them in totally seperate windows. Given my basic understanding of Twisted, I see no way of doing this, and my whole GUI is contained in one class. The project is doable this way, it would just be much better with multiple class and multiple window seperation. I am using Tkinter to design my GUIs, using the specialized Twisted support code to setup the reactor. If anyone can give me any direction, I would appreciate it very much. Thanks

1 0