[Twisted-Python] Perspective / Client confusion

[Patrick K. O'Brien]

On Friday 30 May 2003 02:36 am, Luc Stepniewski wrote:
> On Friday 30 May 2003 02:55, Patrick K. O'Brien wrote:
> > This is working so far:
> >
> >     identity = auth.createIdentity('root')
> >     identity.setPassword('password')
> >     identity.save()
> >
> >     perspective = AdminPerspective(identity)
> >     service.addPerspective(perspective)
> >     identity.addKeyForPerspective(perspective)
> >
> >     perspective = UserPerspective(identity)
> >     service.addPerspective(perspective)
> >     identity.addKeyForPerspective(perspective)
>
> If you do this, when the user root/password will log on, how will twisted
> know to which perspective to connect to? How will it differenciate your
> connection as adminperspective or userperpective, as you log as the same
> user/pass?

If you look at twisted.spread.pb you'll see that the pb.connect() function 
takes both a username (same as identity.name) and perspectiveName as 
parameters:

def connect(host, port, username, password, serviceName,
            perspectiveName=None, client=None, timeout=None):
    """Connects and authenticates, then retrieves a PB service.

    Required arguments:
       - host -- the host the service is running on
       - port -- the port on the host to connect to
       - username -- the name you will be identified as to the authorizer
       - password -- the password for this username
       - serviceName -- name of the service to request

    Optional (keyword) arguments:
       - perspectiveName -- the name of the perspective to request, if
            different than the username
       - client -- XXX the \"reference\" argument to
                  perspective.Perspective.attached
       - timeout -- see twisted.internet.tcp.Client

    @returns: A Deferred instance that gets a callback when the final
              Perspective is connected, and an errback when an error
              occurs at any stage of connecting.
    """

So my demo/hack client application supplies those details when a user logs on:

    def main(self):
        name = raw_input('Enter your login name (root): ')
        if not name:
            name = 'root'
        password = raw_input('Enter your password (password): ')
        if not password:
            password = 'password'
        perspective = raw_input('Enter your perspective (root:admin): ')
        if not perspective:
            perspective = 'root:admin'
        df = pb.connect(host='localhost',
                        port=8789,
                        username=name,
                        password=password,
                        serviceName='BankingService',
                        perspectiveName=perspective,
                        client=self,
                        timeout=30)
        df.addCallbacks(self.gotPerspective, self.noPerspective)
        reactor.run()

-- 
Patrick K. O'Brien
Orbtech      http://www.orbtech.com/web/pobrien
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