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_shims.py
#!/usr/bin/env python # # Author: Mike McKerns (mmckerns @caltech and @uqfoundation) # Author: Anirudh Vegesana (avegesan@cs.stanford.edu) # Copyright (c) 2021-2023 The Uncertainty Quantification Foundation. # License: 3-clause BSD. The full license text is available at: # - https://github.com/uqfoundation/dill/blob/master/LICENSE """ Provides shims for compatibility between versions of dill and Python. Compatibility shims should be provided in this file. Here are two simple example use cases. Deprecation of constructor function: ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ Assume that we were transitioning _import_module in _dill.py to the builtin function importlib.import_module when present. @move_to(_dill) def _import_module(import_name): ... # code already in _dill.py _import_module = Getattr(importlib, 'import_module', Getattr(_dill, '_import_module', None)) The code will attempt to find import_module in the importlib module. If not present, it will use the _import_module function in _dill. Emulate new Python behavior in older Python versions: ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ CellType.cell_contents behaves differently in Python 3.6 and 3.7. It is read-only in Python 3.6 and writable and deletable in 3.7. if _dill.OLD37 and _dill.HAS_CTYPES and ...: @move_to(_dill) def _setattr(object, name, value): if type(object) is _dill.CellType and name == 'cell_contents': _PyCell_Set.argtypes = (ctypes.py_object, ctypes.py_object) _PyCell_Set(object, value) else: setattr(object, name, value) ... # more cases below _setattr = Getattr(_dill, '_setattr', setattr) _dill._setattr will be used when present to emulate Python 3.7 functionality in older versions of Python while defaulting to the standard setattr in 3.7+. See this PR for the discussion that lead to this system: https://github.com/uqfoundation/dill/pull/443 """ import inspect import sys _dill = sys.modules['dill._dill'] class Reduce(object): """ Reduce objects are wrappers used for compatibility enforcement during unpickle-time. They should only be used in calls to pickler.save and other Reduce objects. They are only evaluated within unpickler.load. Pickling a Reduce object makes the two implementations equivalent: pickler.save(Reduce(*reduction)) pickler.save_reduce(*reduction, obj=reduction) """ __slots__ = ['reduction'] def __new__(cls, *reduction, **kwargs): """ Args: *reduction: a tuple that matches the format given here: https://docs.python.org/3/library/pickle.html#object.__reduce__ is_callable: a bool to indicate that the object created by unpickling `reduction` is callable. If true, the current Reduce is allowed to be used as the function in further save_reduce calls or Reduce objects. """ is_callable = kwargs.get('is_callable', False) # Pleases Py2. Can be removed later if is_callable: self = object.__new__(_CallableReduce) else: self = object.__new__(Reduce) self.reduction = reduction return self def __repr__(self): return 'Reduce%s' % (self.reduction,) def __copy__(self): return self # pragma: no cover def __deepcopy__(self, memo): return self # pragma: no cover def __reduce__(self): return self.reduction def __reduce_ex__(self, protocol): return self.__reduce__() class _CallableReduce(Reduce): # A version of Reduce for functions. Used to trick pickler.save_reduce into # thinking that Reduce objects of functions are themselves meaningful functions. def __call__(self, *args, **kwargs): reduction = self.__reduce__() func = reduction[0] f_args = reduction[1] obj = func(*f_args) return obj(*args, **kwargs) __NO_DEFAULT = _dill.Sentinel('Getattr.NO_DEFAULT') def Getattr(object, name, default=__NO_DEFAULT): """ A Reduce object that represents the getattr operation. When unpickled, the Getattr will access an attribute 'name' of 'object' and return the value stored there. If the attribute doesn't exist, the default value will be returned if present. The following statements are equivalent: Getattr(collections, 'OrderedDict') Getattr(collections, 'spam', None) Getattr(*args) Reduce(getattr, (collections, 'OrderedDict')) Reduce(getattr, (collections, 'spam', None)) Reduce(getattr, args) During unpickling, the first two will result in collections.OrderedDict and None respectively because the first attribute exists and the second one does not, forcing it to use the default value given in the third argument. """ if default is Getattr.NO_DEFAULT: reduction = (getattr, (object, name)) else: reduction = (getattr, (object, name, default)) return Reduce(*reduction, is_callable=callable(default)) Getattr.NO_DEFAULT = __NO_DEFAULT del __NO_DEFAULT def move_to(module, name=None): def decorator(func): if name is None: fname = func.__name__ else: fname = name module.__dict__[fname] = func func.__module__ = module.__name__ return func return decorator def register_shim(name, default): """ A easier to understand and more compact way of "softly" defining a function. These two pieces of code are equivalent: if _dill.OLD3X: def _create_class(): ... _create_class = register_shim('_create_class', types.new_class) if _dill.OLD3X: @move_to(_dill) def _create_class(): ... _create_class = Getattr(_dill, '_create_class', types.new_class) Intuitively, it creates a function or object in the versions of dill/python that require special reimplementations, and use a core library or default implementation if that function or object does not exist. """ func = globals().get(name) if func is not None: _dill.__dict__[name] = func func.__module__ = _dill.__name__ if default is Getattr.NO_DEFAULT: reduction = (getattr, (_dill, name)) else: reduction = (getattr, (_dill, name, default)) return Reduce(*reduction, is_callable=callable(default)) ###################### ## Compatibility Shims are defined below ###################### _CELL_EMPTY = register_shim('_CELL_EMPTY', None) _setattr = register_shim('_setattr', setattr) _delattr = register_shim('_delattr', delattr)
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