Mailman 3 December 2011 - Twisted

[Twisted-Python] logging question
by Jeffrey Ollie Dec. 2, 2011

Dec. 2, 2011

I'm using twisted.python.log to do some logging in an application. It's formatting the output like "<date> [-] <mymessage>". I've seen in some of my other applications that the contents of "[-]" can change depending on how the code is reached. Is there a way that I can customize this in my application? I'd like to change the contents to reflect the particular object that is generating the log message. -- Jeff Ollie

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[Twisted-Python] Telnet negotiation with Twisted
by Lee Orsino Dec. 2, 2011

Dec. 2, 2011

Hi all, I'm writing a twisted Telnet server and I want a client to be able to connect to it through some other interface, such as PuTTY. I can make the connection fine. But one of my requirements is to be able to tell the client to switch back and forth between buffered and unbuffered input modes depending on the state of the server. (Sometimes, the client should enter text, then hit enter to send. Other times, the client should send data character-by-character). I'm new at this, and maybe I'm missing something, but in my TelnetTransport object, I do something like this to disable buffering of client data: self.transport.write(IAC + WILL + LINEMODE) self.transport.write(IAC + SB + LINEMODE + MODE + chr(0) + IAC + SE) Not working though. PuTTY still requires me to hit <enter> after I type. I've tried various combinations of the above. I'm sure I'm doing something wrong but its just really hard to find an example of this on the net. I'd appreciate some advice as to how to proceed, or a simple example if you have time... I'm using the twisted Telnet classes found here: http://twistedmatrix.com/trac/browser/tags/releases/twisted-8.2.0/twisted/c… Thanks!

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Re: [Twisted-Python] Using decorator syntax in Twisted
by Itamar Turner-Trauring Dec. 1, 2011

Dec. 1, 2011

> Can we start with a limited experimental usage? Some new code can be > written this way, and we'll see if there's any negative feedback > following the next release. > > I don't want existing code to get ported to the new syntax just because > it's possible now. Sure, just because it's possible doesn't mean we should go and change all existing code.

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[Twisted-Python] Using decorator syntax in Twisted
by Itamar Turner-Trauring Dec. 1, 2011

Dec. 1, 2011

Until now we haven't AFAIK used decorator syntax, but I think it's time we start to. In places where we were already using decorators without the special syntax, that is. Consider: def foo(cls, arg): # lalalal foo = classmethod(foo) One has to type "foo" three times (a potential source of error), and the special semantics of the function are known to the reader only *after* reading the function. On the other hand: @classmethod def foo(cls, arg): # lalalal This suffers from none of these problems. Any disagreement?

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[Twisted-Python] Good evening
by teratorn＠twistedmatrix.com Dec. 1, 2011

Dec. 1, 2011

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[Twisted-Python] Rts/Cts Serial port flow control in twisted
by dsturmfels＠gmail.com Dec. 1, 2011

Dec. 1, 2011

Hi, Has anyone had much experience with serial flow control in twisted? I've been using a twisted serial port in my gtk+ software for quite a while now, and I can get xonxoff flow control to work, but for some reason, rtscts flow control isn't working (or I may be using it wrong). I'm connecting the software, via a usb-serial cable, to a Datalogic barcode scanner cradle. I've been able to replicate this problem with pyserial as well. Without flow control on, I can for example, send a particular serial string to the cradle, and the cradle replies instantly with it's software version (as a string). If I scan a barcode, this also instantly shows up in twisted/pyserial/etc (as a string). With xonxoff flow control on in both the software and cradle, the serial connection works exactly the same as having no flow control on. With rtscts flow control on in both the software and cradle however, the cradle doesn't reply instantly with it's software version when the correct string is sent. However, a scanned barcode shows up instantly in the twisted/pyserial software, and if you've previously requested the cradle software version, the software version string only shows up directly after receiving a barcode string. Am I doing something wrong, or does anyone know what might be going on here? Thanks, Darcy.

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