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71 lines
2.3 KiB
Python
71 lines
2.3 KiB
Python
from __future__ import absolute_import
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import six
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from typing import List, Any
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from netlib.utils import Serializable
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def _is_list(cls):
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# The typing module backport is somewhat broken.
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# Python 3.5 or 3.6 should fix this.
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is_list_bugfix = getattr(cls, "__origin__", False) == getattr(List[Any], "__origin__", True)
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return issubclass(cls, List) or is_list_bugfix
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class StateObject(Serializable):
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"""
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An object with serializable state.
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State attributes can either be serializable types(str, tuple, bool, ...)
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or StateObject instances themselves.
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"""
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_stateobject_attributes = None
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"""
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An attribute-name -> class-or-type dict containing all attributes that
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should be serialized. If the attribute is a class, it must implement the
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Serializable protocol.
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"""
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def get_state(self):
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"""
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Retrieve object state.
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"""
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state = {}
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for attr, cls in six.iteritems(self._stateobject_attributes):
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val = getattr(self, attr)
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if val is None:
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state[attr] = None
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elif hasattr(val, "get_state"):
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state[attr] = val.get_state()
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elif _is_list(cls):
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state[attr] = [x.get_state() for x in val]
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else:
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state[attr] = val
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return state
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def set_state(self, state):
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"""
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Load object state from data returned by a get_state call.
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"""
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state = state.copy()
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for attr, cls in six.iteritems(self._stateobject_attributes):
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if state.get(attr) is None:
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setattr(self, attr, state.pop(attr))
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else:
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curr = getattr(self, attr)
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if hasattr(curr, "set_state"):
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curr.set_state(state.pop(attr))
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elif hasattr(cls, "from_state"):
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obj = cls.from_state(state.pop(attr))
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setattr(self, attr, obj)
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elif _is_list(cls):
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cls = cls.__parameters__[0]
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setattr(self, attr, [cls.from_state(x) for x in state.pop(attr)])
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else: # primitive types such as int, str, ...
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setattr(self, attr, cls(state.pop(attr)))
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if state:
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raise RuntimeWarning("Unexpected State in __setstate__: {}".format(state))
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