[Twisted-Python] Insults, Can't write from connectionMade?

Jean-Paul Calderone exarkun at divmod.com
Sat Jul 8 12:31:55 EDT 2006

On Sat, 8 Jul 2006 11:55:55 -0400, Mike Pelletier <mike at mkp.ca> wrote:
>Hello, twisted Twisted coders.  I am trying to get familiarised with
>twisted.conch.insults.  I've run into some behaviour I cannot explain.
>Attached is a .tac including the following excerpt:
>class MyTerminalProtocol(insults.TerminalProtocol):
>    width = 80
>    height = 24
>    def connectionMade(self):
>        self.terminalSize(self.width, self.height)
>        self.terminal.write(" world\n")
>    def terminalSize(self, width, height):
>        self.width, self.height = width, height
>        self.terminal.eraseDisplay()
>        self.terminal.write("Hello,")
>When a connection is made, the screen is cleared and "Hello," is written,
>but " world\n" is not (or at least it never appears on the terminal).  Why
>is "world\n" not written?

It actually is written:

>>> import socket
>>> s = socket.socket()
>>> s.connect(('localhost', 1977))
>>> s.recv(1024)
'\xff\xfd"\xff\xfd\x1f\xff\xfd\x03\xff\xfb\x01\x1b[2JHello, world\r\r\r\n'

I'm not sure why "Hello," shows up in an xterm but " world" doesn't: it
may be a terminal emulation bug or some legitimate interaction between
all the control sequences included there.  But clearly there is a problem
here somewhere - your \n is being translated into \r\r\r\n.

Could you file a ticket in the tracker and attach this tac file?

>Oddly (or perhaps revealingly for someone with more clues than me), when in a
>previous version I did not use TelnetTransport and TelnetBootstrapProtocol, I
>was able to write just fine from connectionMade.
>TIA for a liberal and violent application of the clue stick.


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