#!/usr/bin/env python
# twisted_pbechoserver.py -- An echo server with perspective and cred
# From: Twisted-8.0.1/doc/core/examples/pbecho.py

from twisted.spread import pb
from twisted.cred.portal import IRealm
from zope.interface import implements

class DefinedError(pb.Error):
    pass

class SimplePerspective(pb.Avatar):
    def perspective_echo(self, text):
        print 'echoing',text
        return text
    
    def perspective_error(self):
        print 'raising exception'
        raise DefinedError("exception!")
    
    def logout(self):
        print self, "logged out"

class SimpleRealm:
    implements(IRealm)

    def requestAvatar(self, avatarId, mind, *interfaces):
        if pb.IPerspective in interfaces:
            avatar = SimplePerspective()
            return pb.IPerspective, avatar, avatar.logout 
        else:
            raise NotImplementedError("no interface")


if __name__ == '__main__':
    from twisted.internet import reactor
    from twisted.cred.portal import Portal
    from twisted.cred.checkers import InMemoryUsernamePasswordDatabaseDontUse
    portal = Portal(SimpleRealm())
    checker = InMemoryUsernamePasswordDatabaseDontUse()
    checker.addUser("guest", "guest")
    portal.registerChecker(checker)
    reactor.listenTCP(pb.portno, pb.PBServerFactory(portal))
    reactor.run()