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from __future__ import absolute_import, print_function, division
import six
from typing import Any
from typing import List
import netlib.basetypes
def _is_list(cls):
# The typing module is broken on Python 3.5.0, fixed on 3.5.1.
is_list_bugfix = getattr(cls, "__origin__", False) == getattr(List[Any], "__origin__", True)
return issubclass(cls, List) or is_list_bugfix
class StateObject(netlib.basetypes.Serializable):
"""
An object with serializable state.
State attributes can either be serializable types(str, tuple, bool, ...)
or StateObject instances themselves.
"""
_stateobject_attributes = None
"""
An attribute-name -> class-or-type dict containing all attributes that
should be serialized. If the attribute is a class, it must implement the
Serializable protocol.
"""
def get_state(self):
"""
Retrieve object state.
"""
state = {}
for attr, cls in six.iteritems(self._stateobject_attributes):
val = getattr(self, attr)
if val is None:
state[attr] = None
elif hasattr(val, "get_state"):
state[attr] = val.get_state()
elif _is_list(cls):
state[attr] = [x.get_state() for x in val]
else:
state[attr] = val
return state
def set_state(self, state):
"""
Load object state from data returned by a get_state call.
"""
state = state.copy()
for attr, cls in six.iteritems(self._stateobject_attributes):
val = state.pop(attr)
if val is None:
setattr(self, attr, val)
else:
curr = getattr(self, attr)
if hasattr(curr, "set_state"):
curr.set_state(val)
elif hasattr(cls, "from_state"):
obj = cls.from_state(val)
setattr(self, attr, obj)
elif _is_list(cls):
cls = cls.__parameters__[0] if cls.__parameters__ else cls.__args__[0]
setattr(self, attr, [cls.from_state(x) for x in val])
else: # primitive types such as int, str, ...
setattr(self, attr, cls(val))
if state:
raise RuntimeWarning("Unexpected State in __setstate__: {}".format(state))
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