Mailman 3 September 2004 - Twisted

[Twisted-Python] Making non-blocking code blocking?
by Paul Campbell 03 Sep '04

03 Sep '04

Here's the situation... I've been writing all my code to defer correctly. Every time it gets to a point where the call can block, I've inserted the appropriate callback function. However, it occurred to me (for testing purposes) that it would be nice some times to INTENTIONALLY block. Right now, it seems like the only point where you can actually "block" is when you reach the top level where the code is interacting with the reactor interface. So far, it seems like once you get the idea of writing deferred code (which is essentially continuation passing style, right?) that it is hard to get OUT of the mindset of writing deferreds into everything. I'm writing a whole lot of RPC-based code right now, which means there are LOTS of places where blocking actions can happen, so almost everything ends up wrapped with deferreds. The alternative is to use threads, but...ugh! I think those are even uglier.

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[Twisted-Python] How to install to another directory?
by junk＠mnjdesigns.com 03 Sep '04

03 Sep '04

How do I install to another directory other then the default using python setup.py install. Any help appreciated! - M

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[Twisted-Python] Small bug fix for twisted.mail.pop3
by Andreas Kostyrka 03 Sep '04

03 Sep '04

Hi! I'd propose to include this small patch, as it seems to be unconditionally verbose: Index: twisted/mail/pop3.py =================================================================== --- twisted/mail/pop3.py (revision 11428) +++ twisted/mail/pop3.py (working copy) @@ -148,7 +148,8 @@ self.magic = self.generateMagic() self.successResponse(self.magic) self.setTimeout(self.timeOut) - log.msg("New connection from " + str(self.transport.getPeer())) + if self.factory.noisy: + log.msg("New connection from " + str(self.transport.getPeer())) def connectionLost(self, reason): if self._onLogout is not None: As noisy is defined twisted.internet.protocol.Factory, it should benign, running trial on twisted/test doesn't seem to produce anything worse than a heap of Deprecation warnings. TIA, Andreas -- Andreas Kostyrka Josef-Mayer-Strasse 5 83043 Bad Aibling

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[Twisted-Python] Spawning processes and multiple CPU's.
by Matt Feifarek 02 Sep '04

02 Sep '04

I'm using reactor.spawnProcess to perform some inherently-blocking code (imagemagick scripts). I'm curious if multiple CPU's would help me out. I know that a single python (and therefore a single reactor) cannot benefit from multiple CPU's, but since the spawn process is a kernel call, will it be sent to both processors? Thanks.

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[Twisted-Python] Re: Perspective Broker and UDP, is it possible?
by Ed Suominen 02 Sep '04

02 Sep '04

> I'm doing my master thesis in computer science, and the topic > for the project is "Managment of network delays in computer games". > The software im going to use is Python with Twisted and Pygame. > Right now I'm trying to get to know how different parts of Twisted > interact with each other. And my first question is: > > Is it possible to use Perspective Broker with UDP? > I've tried modifying the examples here > (http://www.twistedmatrix.com/documents/current/howto/pb-usage), > with DatagramProtocol and so on, but I haven't got it to work. > I suspect that it is impossible due to that UDPs is connectionless, > but there's a lot of "magic" in Twisted, so I thought I'd better > ask the pros'. It is certainly possible, just not with the current version of PB. In any modified version (go for it!), I think you would need to provide client identifying info with each burst of data, or limit "connections" to just one client at a time per port, to keep track of things. I'm not a twisted expert, but I do use it extensively. I have also learned an embarrassingly large amount of stuff about low-level TCP/IP due to too much experience with a vastly inferior high-level language [1]. [1] http://tinyurl.com/5nrkp Ed Suominen Registered Patent Agent Open-Source Software Author (yes, both...) Web Site: http://www.eepatents.com

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[Twisted-Python] Perspective Broker and UDP, is it possible?
by Joakim Bech 01 Sep '04

01 Sep '04

I'm doing my master thesis in computer science, and the topic for the project is "Managment of network delays in computer games". The software im going to use is Python with Twisted and Pygame. Right now I'm trying to get to know how different parts of Twisted interact with each other. And my first question is: Is it possible to use Perspective Broker with UDP? I've tried modifying the examples here (http://www.twistedmatrix.com/documents/current/howto/pb-usage), with DatagramProtocol and so on, but I haven't got it to work. I suspect that it is impossible due to that UDPs is connectionless, but there's a lot of "magic" in Twisted, so I thought I'd better ask the pros'. Mvh // Joakim Bech Mail: d00jb(a)efd.lth.se

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[Twisted-Python] Resource Tree
by Tsai Li Ming 31 Aug '04

31 Aug '04

Hi For example, as given in the howto to handle url path segment: root = Hello() root.putChild('fred', Hello()) root.putChild('bob', Hello()) Therefore, the following URLs are valid: http://example.com/ http://example.com/fred http://example.com/bob http://example.com/fred/ http://example.com/bob/ How do I handle non-existent url like http://example.com/foo? Liming

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Twisted September 2004