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Real handling of network errors. Fix for correctly ignoring net errors: It seems that (at least in my installed Debian version of python2.4) socket.error does not have an errno attribute but is simply a tuple of (errno, strerror). So we now try to get errno first and if this fails we try to use err [0]. This works for a simple test-script to which I can connect with telnet on port 4711 -- it will correctly detect errno.EPIPE if I terminate the telnet session: #!/usr/bin/python2.4 import socket import errno from SocketServer import TCPServer, BaseRequestHandler class Server (BaseRequestHandler) : def handle (self) : self.file = self.request.makefile () try : while True : print >> self.file, "Testing..." except socket.error, err : print getattr (err, 'errno', "Has no errno") print err [0] print err [0] == errno.EPIPE raise # end def handle # end class Server server_address = ('', 4711) s = TCPServer (server_address, Server) s.serve_forever () Sorry for the verbose log-message but I hope to document my debugging activities
author Ralf Schlatterbeck <schlatterbeck@users.sourceforge.net>
date Tue, 16 Jan 2007 10:16:08 +0000
parents df4a3355ee8f
children bbab97f8ffb2
line wrap: on
line source

#$Id: exceptions.py,v 1.6 2004-11-18 14:10:27 a1s Exp $
'''Exceptions for use in Roundup's web interface.
'''

__docformat__ = 'restructuredtext'

import cgi

class HTTPException(Exception):
    pass

class LoginError(HTTPException):
    pass

class Unauthorised(HTTPException):
    pass

class Redirect(HTTPException):
    pass

class NotFound(HTTPException):
    pass

class NotModified(HTTPException):
    pass

class FormError(ValueError):
    """An 'expected' exception occurred during form parsing.

    That is, something we know can go wrong, and don't want to alarm the user
    with.

    We trap this at the user interface level and feed back a nice error to the
    user.

    """
    pass

class SendFile(Exception):
    """Send a file from the database."""

class SendStaticFile(Exception):
    """Send a static file from the instance html directory."""

class SeriousError(Exception):
    """Raised when we can't reasonably display an error message on a
    templated page.

    The exception value will be displayed in the error page, HTML
    escaped.
    """
    def __str__(self):
        return '''
<html><head><title>Roundup issue tracker: An error has occurred</title>
 <link rel="stylesheet" type="text/css" href="@@file/style.css">
</head>
<body class="body" marginwidth="0" marginheight="0">
 <p class="error-message">%s</p>
</body></html>
'''%cgi.escape(self.args[0])

# vim: set filetype=python sts=4 sw=4 et si :
Roundup Issue Tracker: http://roundup-tracker.org/