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from .exitable import ExitableWithAliases
class NameOwner(ExitableWithAliases("unown")):
__slots__ = ()
def __init__(self, bus, name, allow_replacement, replace):
flags = 4 | (1 if allow_replacement else 0) | (2 if replace else 0)
res = bus.dbus.RequestName(name, flags)
if res == 1:
self._at_exit(lambda: bus.dbus.ReleaseName(name))
return # OK
if res == 3:
raise RuntimeError("name already exists on the bus")
if res == 4:
raise RuntimeError("you're already the owner of this name")
raise RuntimeError("cannot take ownership of the name")
class RequestNameMixin(object):
__slots__ = ()
def request_name(self, name, allow_replacement=True, replace=False):
"""Aquires a bus name.
Returns
-------
NameOwner
An object you can use as a context manager to unown the name later.
"""
return NameOwner(self, name, allow_replacement, replace)