def __init__(self, player):
if locks.authority() is not locks.SYSTEM:
raise locks.LockFailedError(
"PythonMode requires system authority.")
self.console = code.InteractiveConsole()
player.send(">>>")
def go(self, player):
if not self.locks.go(player):
raise locks.LockFailedError(
"You can't go through {}.".format(self))
player.location = self.destination
params = {
"player": player.name,
"exit": self.name,
"source": self.location.name,
"destination": self.destination.name
}
try:
self.location.emit(self.depart_message.format(**params))
except AttributeError:
pass
try:
self.destination.emit(self.arrive_message.format(**params),
exceptions=[player])
except AttributeError:
pass
try:
player.send(self.go_message.format(**params))
except AttributeError:
pass
def destroy(self):
"""
Destroy this object, if current authority passes its destroy lock.
"""
if not self.locks.destroy():
raise locks.LockFailedError("You cannot destroy {}.".format(
self.name, self.owner))
delete(self)
def location(self, destination):
origin = self.location
if not destination.locks.insert():
raise locks.LockFailedError("You can't put that in {}.".format(
destination.name))
if origin and not origin.locks.remove():
raise locks.LockFailedError(
"You can't remove that from {}.".format(origin.name))
player = locks.authority()
if destination == player:
if not self.locks.take():
raise locks.LockFailedError("You cannot take {}.".format(
self.name))
elif origin == player:
if not self.locks.drop():
raise locks.LockFailedError("You cannot drop {}.".format(
self.name))
# Locks passed or non-applicable. Proceed with the move.
with locks.authority_of(locks.SYSTEM):
self._location = destination
with locks.authority_of(self):
# this gets to use self authority because it should always happen,
# regardless of the reason location is being changed.
# it does NOT get to use system authority because it's sometimes
# (always, for players) how position gets initialized, which locks
# the object out of its own position attribute.
if destination is not origin:
# whatever we were doing there, we're not doing it any more
self.position = None
# Trigger a "look" command so we see our new surroundings
from muss.commands.world import Look
try:
Look().execute(self, {"obj": destination})
except AttributeError:
pass
def __getattribute__(self, attr):
if attr == "__dict__" and locks.authority() is locks.SYSTEM:
# This comes up when we're unpickling the db, and attr_locks
# doesn't exist yet
return super(Object, self).__getattribute__(attr)
attr_locks = super(Object, self).__getattribute__("attr_locks")
if attr in attr_locks:
if attr_locks[attr].get_lock():
# Lock passes; grant access
return super(Object, self).__getattribute__(attr)
else:
# Lock fails; deny access
raise locks.LockFailedError("You don't have permission to get "
"{} from {}.".format(attr, self))
else:
# No lock is defined; grant access
return super(Object, self).__getattribute__(attr)
def name(self, name):
if name.startswith("#"):
raise ValueError("Names can't begin with a #.")
if hasattr(self, "name"):
with locks.authority_of(locks.SYSTEM):
lock = self.attr_locks["name"].set_lock
if lock():
with locks.authority_of(locks.SYSTEM):
self._name = name
else:
raise locks.LockFailedError("You don't have permission to set "
"name on {}.".format(self))
else:
lock = locks.OwnsAttribute(self, "name")
attr_lock = locks.AttributeLock(set_lock=lock)
with locks.authority_of(locks.SYSTEM):
self.attr_locks["name"] = attr_lock
self._name = name
def __delattr__(self, attr):
try:
with locks.authority_of(locks.SYSTEM):
owner_lock = locks.Owns(self.attr_locks[attr])
except KeyError as e:
if hasattr(self, attr):
# Attribute exists, lock doesn't. This is a code error.
raise e
else:
# The attribute doesn't exist.
raise AttributeError
if owner_lock():
super(Object, self).__delattr__(attr)
with locks.authority_of(locks.SYSTEM):
del self.attr_locks[attr]
else:
raise locks.LockFailedError(
"You don't have permission to unset {} "
"on {}.".format(attr, self))
def lock_attr(self, attr, owner=None, get_lock=None, set_lock=None):
if not hasattr(self, attr):
raise KeyError("{} has no attribute {}.".format(self, attr))
with locks.authority_of(locks.SYSTEM):
lock = self.attr_locks[attr]
if (locks.authority() is not lock.owner
and locks.authority() is not locks.SYSTEM):
raise locks.LockFailedError("You don't own that attribute.")
if owner is None and get_lock is None and set_lock is None:
raise TypeError(
"Specify at least one of owner, get_lock, set_lock")
if owner is not None:
lock.owner = owner
if get_lock is not None:
lock.get_lock = get_lock
if set_lock is not None:
lock.set_lock = set_lock
def __setattr__(self, attr, value):
# Does the attribute already exist?
if attr not in super(Object, self).__getattribute__("__dict__"):
# No, it's a new one; allow the write and also create a default lock
super(Object, self).__setattr__(attr, value)
lock = locks.AttributeLock(
set_lock=locks.OwnsAttribute(self, attr))
with locks.authority_of(locks.SYSTEM):
self.attr_locks[attr] = lock
else:
# Yes, so check the lock
with locks.authority_of(locks.SYSTEM):
if attr not in self.attr_locks:
# No lock is defined; allow the write
return super(Object, self).__setattr__(attr, value)
else:
set_lock = self.attr_locks[attr].set_lock
if set_lock():
return super(Object, self).__setattr__(attr, value)
else:
# Lock fails; deny the write
raise locks.LockFailedError("You don't have permission to set "
"{} on {}.".format(attr, self))
def location(self):
# Everything has a location. If feel the need to delete it, consider
# setting it to None instead.
raise locks.LockFailedError("You don't have permission to unset "
"location on {}.".format(self))
