autobahn_exceptions.py

from twisted.python.failure import Failure
from autobahn.wamp import WampServerProtocol

class WampException(Exception):
    """A base class for an application exception.  Can be subclass and
    define a unique msg."""
    msg = None
    
    def __init__(self, *args):
        if len(args) == 0:
            args = ( self.msg, )
        Exception.__init__(self, *args)


class Protocol(WampServerProtocol):
    
    def onSessionOpen(self):
        self.includeTraceback = False # Don't send tracebacks to client

    def onAfterCallError(self, error, call):
        """Handle any exceptions raised.  Any exception that is not a subclass
        of WampException will be replaced with a very generic exception."""
        if error.check(WampException):
            return error
        # Print out traceback and send only a generic error to client.
        error.printTraceback()
        return Failure(Exception('An unexpected error has occurred.'),
                Exception)