>From some experimentation I find that the only way to make a Viewable
get a meaningful perspective argument when executing view_* methods is
to make sure that the references to that Viewable are given to clients
as return values from perspective_* methods called on a pb.Avatar.
In particular, if the Avatar gives a client a reference to a Viewable
by passing it as an argument to a remote_* method on the client,
subsequent invocations of view_* methods by the client result in
perspective argument in view_* methods being None.
I have attached a complete working example of a client and server that
succinctly illustrates this issue.
Question: Is there a way to distribute un-asked for references to
Viewables that properly get the perspective argument in their view_*
methods?
Sincerely,
Daniel Sank
#!/usr/bin/env python
from twisted.spread import pb
from twisted.internet import reactor
from twisted.cred import credentials
class Client(pb.Referenceable):
def connect(self):
factory = pb.PBClientFactory()
reactor.connectTCP("localhost", 8800, factory)
def1 = factory.login(credentials.UsernamePassword("alice", "1234"),
client=self)
def1.addCallback(self.connected)
reactor.run()
def connected(self, perspective):
self.perspective = perspective
d = perspective.callRemote("getViewable")
d.addCallback(self.gotViewable)
def gotViewable(self, v):
v.callRemote("test", "RETURNED FROM")
def remote_takeViewable(self, v):
v.callRemote("test", "SENT BY")
Client().connect()#!/usr/bin/env python
from zope.interface import implements
from twisted.cred import portal, checkers
from twisted.spread import pb
from twisted.internet import reactor
class MyViewable(pb.Viewable):
def view_test(self, perspective, description):
print("This viewpoint was %s the Avatar"%description)
print("and we got the following perspective: %s"%perspective)
class MyRealm(object):
implements(portal.IRealm)
def requestAvatar(self, avatarID, mind, *interfaces):
assert pb.IPerspective in interfaces
avatar = User(avatarID, mind)
return pb.IPerspective, avatar, lambda a=avatar:a.logout()
class User(pb.Avatar):
def __init__(self, name, mind):
self.name = name
self.mind = mind
self.v = MyViewable()
mind.callRemote("takeViewable", self.v)
def perspective_getViewable(self):
return self.v
def logout(self):
self.mind = None
realm = MyRealm()
checker = checkers.InMemoryUsernamePasswordDatabaseDontUse()
checker.addUser("alice", "1234")
p = portal.Portal(realm, [checker])
reactor.listenTCP(8800, pb.PBServerFactory(p))
reactor.run()_______________________________________________
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