[Twisted-Python] newbie confusion - puzzling reactor response

[Mark Bailey]

Hi:

Aren't you adding two readers?  One is added in the __init__ method of
inputFile, the other in the test code.

I'm also a newbie so maybe I'm equally confused...

On Tue, Feb 9, 2010 at 8:47 PM, K. Richard Pixley <rich at noir.com> wrote:

>  I'm confused be the response I get to the attached program.
>
> In a nutshell, I'm building a reader, attaching it with addReader, later
> removing it with removeReader.  And I'm getting this:
>
> time python test_reactor.py
> Traceback (most recent call last):
> Failure: twisted.internet.error.ConnectionFdescWentAway: Uh: Filedescriptor
> went away.
>
> Which seems to be telling me that I don't know as much yet as I'd hoped.
>
> Why would the reactor care about a closed file descriptor that isn't even
> in it's interest set?
>
> --rich
>
> #!/usr/bin/env python
> # -*- coding: utf-8 -*-
>
> import os
>
> from zope.interface import implements
> from twisted.internet import reactor
> from twisted.internet.interfaces import IReadDescriptor
>
> class inputFile(object):
>    implements(IReadDescriptor)
>
>    def __init__(self, filename):
>        self.filename = filename
>        self.filedes = os.open(filename, os.O_RDONLY | os.O_NONBLOCK)
>        reactor.addReader(self)
>
>    def fileno(self):
>        return self.filedes
>
>    def connectionLost(self, reason):
>        raise reason
>
>    def logPrefix(self):
>        return 'inputFile'
>
>    def doRead(self):
>        reactor.removeReader(self)
>        os.close(self.filedes)
>        self.filedes = -1
>        reactor.stop()
>
> if __name__ == '__main__':
>    r = inputFile('/etc/group')
>    reactor.addReader(r)
>    reactor.run()
>
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