Mailman 3 November 2003 - Twisted

[Twisted-Python] Interfaces
by Phil Christensen 13 Nov '03

13 Nov '03

first of all, just wanted to thank you guys for all your help. i'm really starting to get some of the more advanced stuff in twisted, and it's definitely totally cool... i was wondering if someone could give me a quick explanation of how interfaces work in twisted, or point me towards the right docstrigns to read... thanks, -phil

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[Twisted-Python] SSL.SysCallError in doRead
by Sam Jordan 13 Nov '03

13 Nov '03

Hi, I noted the following exception while running some msn related code earlier: 2003/11/14 05:09 EST [PassportLogin,client] Traceback (most recent call last): File "/home/sam/Twisted/twisted/python/log.py", line 65, in callWithLogger callWithContext({"system": lp}, func, *args, **kw) File "/home/sam/Twisted/twisted/python/log.py", line 52, in callWithContext return context.call({ILogContext: newCtx}, func, *args, **kw) File "/home/sam/Twisted/twisted/python/context.py", line 32, in callWithContext return func(*args,**kw) File "/home/sam/Twisted/twisted/internet/default.py", line 513, in _doReadOrWrite why = getattr(selectable, method)() --- <exception caught here> --- File "/home/sam/Twisted/twisted/internet/tcp.py", line 98, in doRead return Connection.doRead(self) File "/home/sam/Twisted/twisted/internet/tcp.py", line 234, in doRead data = self.socket.recv(self.bufferSize) SSL.SysCallError: (104, 'Connection reset by peer') On closer inspection it seems that the surrounding try/except clause only cares about SSL.SysCallErrors which pertain to unexpected EOF and all others are re-raised. The only reason I can come up with for why this is the case is that it was not anticipated that other exceptions (like the one above) could arise from the given recv call. I would expect that in the above instance, connectionLost should be called, but it may very well be that i'm missing some subtlety so I am yet to submit a bug report. Cheers, Sam.

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[Twisted-Python] help please: trouble installing twisted python on Windows 2000 Pro, but not Windows XP Pro
by John Benson 13 Nov '03

13 Nov '03

Hi, I just installed twisted python on my Windows XP laptop which has Python 2.3.2. I went to install it on Windows 2000 Professional version 5.00.2195 Service Pack 4 running Python 2.3 and got the following dialog box diagnostic: "Setup: CreateFile failed; code 5. Access is denied." I've been able to install piles of stuff on this system before, so I figure I have the required administrative privileges. I logon to a Windows domain, and my ID is in the Administrators group of the domain. There is a separate Administrator logon local to the machine which I haven't used, and probably can't get the password for, since this is a managed PC within the domain. Here are my questions: 1) What does the "code 5" failure mean? 2) What am I doing wrong? 3) Can I just move the twisted site-package folders over from my XP system Python 2.3 folder to the corresponding Windows 2000 Pro folder? I'm mostly interested in just importing the twisted modules and prototyping; I can do without the icons and start menu entries.

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[Twisted-Python] tap2ntsvc in sandbox
by Cory Dodt 12 Nov '03

12 Nov '03

-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 Twisted/sandbox/moonfallen/tap2ntsvc.py If you have an Twisted application that you want to make into a service on Windows, give this a try. It's very basic right now; it absolutely needs py2exe and Inno setup support before I'll consider it done. The goal is to have the output be a complete binary package analogous to the output of tap2deb or tap2rpm. The only difference will be that, instead of depending on software like the Linux versions do, it will do as much as it can to help you include the dependencies in the package using py2exe. Right now, nothing beyond generating a service script is done. Here's the help: Usage: tap2ntsvc.py [options] <filename> Options: ~ -y, --type= Config file type: pickle, xml, source, or python ~ -o, --output-file= Name of the setup executable produced ~ -n, --name= Short name of the service (used with "net start") ~ -d, --display-name= Human-readable name of the service ~ -e, --description= Description of the service ~ -r, --reactor= Reactor to install (like twistd) [default: default] ~ --version ~ --help Display this help and exit. Do something like . . . | python tap2ntsvc.py myapp.tac The output is myappsvc.py (or <name>svc.py). Then you run myappsvc.py: | python myappsvc.py install Installing service myapp to Python class C:\myapp\myappsvc.myapp_ServiceControl Changing service configuration Service updated | net start myapp The myapp run by Twisted service is starting. The myapp run by Twisted service was started successfully. Give it a try, let me know if you have any problems with it. Thanks, C -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.2.3-nr1 (Windows XP) Comment: Using GnuPG with Thunderbird - http://enigmail.mozdev.org iD8DBQE/senW3A5SrXAiHQcRAvNdAJ4n7+yfvB/kcKD1pfGjfgqDbFgqcACcCDYZ jqd+gw+guZ3xg4f5R6I8tIQ= =kTlI -----END PGP SIGNATURE-----

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[Twisted-Python] Re: [Twisted-commits] Somehow the waker still messes up cfreactor, never installing waker for now
by Itamar Shtull-Trauring 12 Nov '03

12 Nov '03

On Tue, 11 Nov 2003 21:43:23 -0700 etrepum CVS <etrepum(a)wolfwood.twistedmatrix.com> wrote: > Modified files: > Twisted/twisted/internet/cfreactor.py 1.3 1.4 > > Log message: > Somehow the waker still messes up cfreactor, never installing waker > for now That means threaded programs with cfreactor will be really slow. I think the issue is that the unix waker uses python sockets. You probably want to write your own waker using whatever APIs you are using. While we're at it - warner, could we have the mac os x reactor also run tests with cfreactor? -- Itamar Shtull-Trauring http://itamarst.org/ Available for Python & Twisted consulting

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[Twisted-Python] Re: [Twisted-commits] Somehow the waker still messes up cfreactor, never installing waker for now
by Brian Warner 12 Nov '03

12 Nov '03

> While we're at it - warner, could we have the mac os x reactor also run > tests with cfreactor? My tests failed: 24:buildbot@quartz% python2.2 bin/trial -to -r cf twisted.test ... File "/Users/buildbot/Buildbot/slave/OSX-full2.2/Twisted/twisted/internet/cfreactor.py", line 42, in ? import cfsupport as cf ImportError: Failure linking new module It might be related to the following warning during the compilation phase: gcc -arch ppc -bundle -flat_namespace -undefined suppress build/temp.darwin-6.8-Power Macintosh-2.2/cfsupport.o -o twisted/internet/cfsupport.so -framework CoreFoundation -framework CoreServices -framework Carbon ld: warning dynamic shared library: /usr/lib/libSystem.dylib not made a weak library in output with MACOSX_DEPLOYMENT_TARGET environment variable set to: 10.1 It doesn't hang, so I'm going to turn on the test anyway (it will just fail all the time). I don't know a lot about OS-X linker magic.. somebody else will have to figure out the problem here. -Brian

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[Twisted-Python] Twisted Names references
by Rudy Schockaert 12 Nov '03

12 Nov '03

Hi, we would like to propose to a customer of our a solution based on Twisted Names. The customer is open to this suggestion, but asked us if we could provide references of companies using Twisted Names in production? If you know of companies we can mention (Name and size of the company, ev. contact person) it would help us a lot. Thanks in advance, Rudy

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[Twisted-Python] Re: [Twisted-commits] Somehow the waker still messes up cfreactor, never installing waker for now
by Brian Warner 12 Nov '03

12 Nov '03

> While we're at it - warner, could we have the mac os x reactor also run > tests with cfreactor? Oh, does that work now? If I recall, that used to hang the buildslave. I'll give it a try and turn on a cfreactor pass if it works. -Brian

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[Twisted-Python] an easy twisted application question
by Phil Christensen 12 Nov '03

12 Nov '03

okay, so if i've got a tap with the following updateApplication method: def updateApplication(app, config): app.registry = registry.Registry() ... ... and i want to access that app.registry attribute from an arbitrary location, how do i do it? i seem to remember hearing that there was only one instance of Application in a process, so does that mean that there's some (forgive the Java-speak) static method defined on the Application module that will get the current running instance? thanks in advance, -phil

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[Twisted-Python] Twisted and mod_python?
by Patrik Blommaskog 12 Nov '03

12 Nov '03

I am wondering about the feasibility of using mod_python in an Apache server to make PB requests to a Twisted application. That is, I have a Twisted application which servers PB requests, e.g. a user manager. I also have an Apache server. I would like the Apache server to present dynamic web pages based on the contents of the user manager application, to act as a web front end (e.g. create/erase/modify user properties). I was thinking that it could be possible to use mod_python and Twisted to act as a client to the user manager. My questions are: 1. Is this possible, fesible and/or reasonable? If so, any hints or examples would be welcome. 2. Any alternative/better solutions? I suppose it would be rather easy to use CGI instead, but I'd like to explore the options. - Patrik

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