def _restore_from_dict(self, obj, instance, ignorereserved=True):
restore_key = self._restore_key_fn()
method = _obj_setattr
for k, v in sorted(obj.items(), key=util.itemgetter):
# ignore the reserved attribute
if ignorereserved and k in tags.RESERVED:
continue
self._namestack.append(k)
k = restore_key(k)
# step into the namespace
value = self._restore(v)
if (util.is_noncomplex(instance)
or util.is_dictionary_subclass(instance)):
instance[k] = value
else:
setattr(instance, k, value)
# This instance has an instance variable named `k` that is
# currently a proxy and must be replaced
if isinstance(value, _Proxy):
self._proxies.append((instance, k, value, method))
# step out
self._namestack.pop()
def _restore_from_dict(self, obj, instance, ignorereserved=True):
restore_key = self._restore_key_fn()
method = _obj_setattr
for k, v in sorted(obj.items(), key=util.itemgetter):
# ignore the reserved attribute
if ignorereserved and k in tags.RESERVED:
continue
self._namestack.append(k)
k = restore_key(k)
# step into the namespace
value = self._restore(v)
if (util.is_noncomplex(instance) or
util.is_dictionary_subclass(instance)):
instance[k] = value
else:
setattr(instance, k, value)
# This instance has an instance variable named `k` that is
# currently a proxy and must be replaced
if isinstance(value, _Proxy):
self._proxies.append((instance, k, value, method))
# step out
self._namestack.pop()
def restore(self, obj):
"""
Restores a flattened object to its original python state.
Simply returns any of the basic builtin types
>>> u = Unpickler()
>>> u.restore('hello world')
'hello world'
>>> u.restore({'key': 'value'})
{'key': 'value'}
"""
self._push()
if has_tag(obj, tags.ID):
objNumber = obj[tags.ID]
try:
objRef = self._objs[objNumber]
except IndexError:
raise IndexError(
'Cannot find objRef %d in self._objs of len(%d), looking for obj %r'
% (objNumber, len(self._objs), obj))
poppedValue = self._pop(objRef)
return poppedValue
if has_tag(obj, tags.REF):
return self._pop(self._namedict.get(obj[tags.REF]))
if has_tag(obj, tags.TYPE):
typeref = loadclass(obj[tags.TYPE])
if not typeref:
return self._pop(obj)
return self._pop(typeref)
if has_tag(obj, tags.REPR):
return self._pop(loadrepr(obj[tags.REPR]))
if has_tag(obj, tags.OBJECT):
cls = loadclass(obj[tags.OBJECT])
if not cls:
return self._pop(obj)
# check custom handlers
HandlerClass = handlers.registry.get(cls)
if HandlerClass:
handler = HandlerClass(self)
return self._pop(handler.restore(obj))
try:
if hasattr(cls, '__new__'):
instance = cls.__new__(cls)
else:
instance = object.__new__(cls)
except TypeError:
# old-style classes
try:
instance = cls()
except TypeError:
# fail gracefully if the constructor requires arguments
self._mkref(obj)
return self._pop(obj)
# keep a obj->name mapping for use in the _isobjref() case
self._mkref(instance)
if hasattr(instance, '__setstate__') and has_tag(obj, tags.STATE):
state = self.restore(obj[tags.STATE])
instance.__setstate__(state)
return self._pop(instance)
for k, v in sorted(obj.iteritems(), key=operator.itemgetter(0)):
# ignore the reserved attribute
if k in tags.RESERVED:
continue
self._namestack.append(k)
# step into the namespace
value = self.restore(v)
if (util.is_noncomplex(instance)
or util.is_dictionary_subclass(instance)):
instance[k] = value
else:
setattr(instance, k, value)
# step out
self._namestack.pop()
# Handle list and set subclasses
if has_tag(obj, tags.SEQ):
if hasattr(instance, 'append'):
for v in obj[tags.SEQ]:
instance.append(self.restore(v))
if hasattr(instance, 'add'):
for v in obj[tags.SEQ]:
instance.add(self.restore(v))
return self._pop(instance)
if util.is_list(obj):
return self._pop([self.restore(v) for v in obj])
if has_tag(obj, tags.TUPLE):
return self._pop(tuple([self.restore(v) for v in obj[tags.TUPLE]]))
if has_tag(obj, tags.SET):
return self._pop(set([self.restore(v) for v in obj[tags.SET]]))
if util.is_dictionary(obj):
data = {}
for k, v in sorted(obj.iteritems(), key=operator.itemgetter(0)):
self._namestack.append(k)
data[k] = self.restore(v)
self._namestack.pop()
return self._pop(data)
return self._pop(obj)
def restore(self, obj):
"""
Restores a flattened object to its original python state.
Simply returns any of the basic builtin types
>>> u = Unpickler()
>>> u.restore('hello world')
'hello world'
>>> u.restore({'key': 'value'})
{'key': 'value'}
"""
self._push()
if has_tag(obj, tags.ID):
objNumber = obj[tags.ID]
try:
objRef = self._objs[objNumber]
except IndexError:
raise IndexError('Cannot find objRef %d in self._objs of len(%d), looking for obj %r' % (objNumber, len(self._objs), obj))
poppedValue = self._pop(objRef)
return poppedValue
if has_tag(obj, tags.REF):
return self._pop(self._namedict.get(obj[tags.REF]))
if has_tag(obj, tags.TYPE):
typeref = loadclass(obj[tags.TYPE])
if not typeref:
return self._pop(obj)
return self._pop(typeref)
if has_tag(obj, tags.REPR):
return self._pop(loadrepr(obj[tags.REPR]))
if has_tag(obj, tags.OBJECT):
cls = loadclass(obj[tags.OBJECT])
if not cls:
return self._pop(obj)
# check custom handlers
HandlerClass = handlers.registry.get(cls)
if HandlerClass:
handler = HandlerClass(self)
return self._pop(handler.restore(obj))
try:
if hasattr(cls, '__new__'):
instance = cls.__new__(cls)
else:
instance = object.__new__(cls)
except TypeError:
# old-style classes
try:
instance = cls()
except TypeError:
# fail gracefully if the constructor requires arguments
self._mkref(obj)
return self._pop(obj)
# keep a obj->name mapping for use in the _isobjref() case
self._mkref(instance)
if hasattr(instance, '__setstate__') and has_tag(obj, tags.STATE):
state = self.restore(obj[tags.STATE])
instance.__setstate__(state)
return self._pop(instance)
for k, v in sorted(obj.iteritems(), key=operator.itemgetter(0)):
# ignore the reserved attribute
if k in tags.RESERVED:
continue
self._namestack.append(k)
# step into the namespace
value = self.restore(v)
if (util.is_noncomplex(instance) or
util.is_dictionary_subclass(instance)):
instance[k] = value
else:
setattr(instance, k, value)
# step out
self._namestack.pop()
# Handle list and set subclasses
if has_tag(obj, tags.SEQ):
if hasattr(instance, 'append'):
for v in obj[tags.SEQ]:
instance.append(self.restore(v))
if hasattr(instance, 'add'):
for v in obj[tags.SEQ]:
instance.add(self.restore(v))
return self._pop(instance)
if util.is_list(obj):
return self._pop([self.restore(v) for v in obj])
if has_tag(obj, tags.TUPLE):
return self._pop(tuple([self.restore(v) for v in obj[tags.TUPLE]]))
if has_tag(obj, tags.SET):
return self._pop(set([self.restore(v) for v in obj[tags.SET]]))
if util.is_dictionary(obj):
data = {}
for k, v in sorted(obj.iteritems(), key=operator.itemgetter(0)):
self._namestack.append(k)
data[k] = self.restore(v)
self._namestack.pop()
return self._pop(data)
return self._pop(obj)
def _flatten_obj_instance(self, obj):
"""Recursively flatten an instance and return a json-friendly dict
"""
data = {}
has_class = hasattr(obj, '__class__')
has_dict = hasattr(obj, '__dict__')
has_slots = not has_dict and hasattr(obj, '__slots__')
has_getnewargs = util.has_method(obj, '__getnewargs__')
has_getnewargs_ex = util.has_method(obj, '__getnewargs_ex__')
has_getinitargs = util.has_method(obj, '__getinitargs__')
has_reduce, has_reduce_ex = util.has_reduce(obj)
# Support objects with __getstate__(); this ensures that
# both __setstate__() and __getstate__() are implemented
has_getstate = hasattr(obj, '__getstate__')
# not using has_method since __getstate__() is handled separately below
if has_class:
cls = obj.__class__
else:
cls = type(obj)
# Check for a custom handler
class_name = util.importable_name(cls)
handler = handlers.get(cls, handlers.get(class_name))
if handler is not None:
if self.unpicklable:
data[tags.OBJECT] = class_name
return handler(self).flatten(obj, data)
reduce_val = None
if has_class and not util.is_module(obj):
if self.unpicklable:
class_name = util.importable_name(cls)
data[tags.OBJECT] = class_name
# test for a reduce implementation, and redirect before doing anything else
# if that is what reduce requests
if has_reduce_ex:
try:
# we're implementing protocol 2
reduce_val = obj.__reduce_ex__(2)
except TypeError:
# A lot of builtin types have a reduce which just raises a TypeError
# we ignore those
pass
if has_reduce and not reduce_val:
try:
reduce_val = obj.__reduce__()
except TypeError:
# A lot of builtin types have a reduce which just raises a TypeError
# we ignore those
pass
if reduce_val:
try:
# At this stage, we only handle the case where __reduce__ returns a string
# other reduce functionality is implemented further down
if isinstance(reduce_val, (str, unicode)):
varpath = iter(reduce_val.split('.'))
# curmod will be transformed by the loop into the value to pickle
curmod = sys.modules[next(varpath)]
for modname in varpath:
curmod = getattr(curmod, modname)
# replace obj with value retrieved
return self._flatten(curmod)
except KeyError:
# well, we can't do anything with that, so we ignore it
pass
if has_getnewargs_ex:
data[tags.NEWARGSEX] = list(map(self._flatten, obj.__getnewargs_ex__()))
if has_getnewargs and not has_getnewargs_ex:
data[tags.NEWARGS] = self._flatten(obj.__getnewargs__())
if has_getinitargs:
data[tags.INITARGS] = self._flatten(obj.__getinitargs__())
if has_getstate:
try:
state = obj.__getstate__()
except TypeError:
# Has getstate but it cannot be called, e.g. file descriptors
# in Python3
self._pickle_warning(obj)
return None
else:
return self._getstate(state, data)
if util.is_module(obj):
if self.unpicklable:
data[tags.REPR] = '%s/%s' % (obj.__name__,
obj.__name__)
else:
data = unicode(obj)
return data
if util.is_dictionary_subclass(obj):
self._flatten_dict_obj(obj, data)
return data
if util.is_sequence_subclass(obj):
return self._flatten_sequence_obj(obj, data)
if util.is_noncomplex(obj):
return [self._flatten(v) for v in obj]
if util.is_iterator(obj):
# force list in python 3
data[tags.ITERATOR] = list(map(self._flatten, islice(obj, self._max_iter)))
return data
if reduce_val and not isinstance(reduce_val, (str, unicode)):
# at this point, reduce_val should be some kind of iterable
# pad out to len 5
rv_as_list = list(reduce_val)
insufficiency = 5 - len(rv_as_list)
if insufficiency:
rv_as_list += [None] * insufficiency
if rv_as_list[0].__name__ == '__newobj__':
rv_as_list[0] = tags.NEWOBJ
data[tags.REDUCE] = list(map(self._flatten, rv_as_list))
# lift out iterators, so we don't have to iterator and uniterator their content
# on unpickle
if data[tags.REDUCE][3]:
data[tags.REDUCE][3] = data[tags.REDUCE][3][tags.ITERATOR]
if data[tags.REDUCE][4]:
data[tags.REDUCE][4] = data[tags.REDUCE][4][tags.ITERATOR]
return data
if has_dict:
# Support objects that subclasses list and set
if util.is_sequence_subclass(obj):
return self._flatten_sequence_obj(obj, data)
# hack for zope persistent objects; this unghostifies the object
getattr(obj, '_', None)
return self._flatten_dict_obj(obj.__dict__, data)
if has_slots:
return self._flatten_newstyle_with_slots(obj, data)
# catchall return for data created above without a return
# (e.g. __getnewargs__ is not supposed to be the end of the story)
if data:
return data
self._pickle_warning(obj)
return None
def _flatten_obj_instance(self, obj):
"""Recursively flatten an instance and return a json-friendly dict
"""
data = {}
has_class = hasattr(obj, '__class__')
has_dict = hasattr(obj, '__dict__')
has_slots = not has_dict and hasattr(obj, '__slots__')
has_getstate = has_dict and hasattr(obj, '__getstate__')
has_getstate_support = has_getstate and hasattr(obj, '__setstate__')
HandlerClass = handlers.registry.get(type(obj))
if (has_class and not util.is_repr(obj) and not util.is_module(obj)):
module, name = _getclassdetail(obj)
if self.unpicklable is True:
data[tags.OBJECT] = '%s.%s' % (module, name)
# Check for a custom handler
if HandlerClass:
handler = HandlerClass(self)
return handler.flatten(obj, data)
if util.is_module(obj):
if self.unpicklable is True:
data[tags.REPR] = '%s/%s' % (obj.__name__, obj.__name__)
else:
data = unicode(obj)
return data
if util.is_repr(obj):
if self.unpicklable is True:
data[tags.REPR] = '%s/%s' % (obj.__class__.__module__,
repr(obj))
else:
data = unicode(obj)
return data
if util.is_dictionary_subclass(obj):
return self._flatten_dict_obj(obj, data)
if util.is_noncomplex(obj):
return [self.flatten(v) for v in obj]
if has_dict:
# Support objects that subclasses list and set
if util.is_collection_subclass(obj):
return self._flatten_collection_obj(obj, data)
# Support objects with __getstate__(); this ensures that
# both __setstate__() and __getstate__() are implemented
if has_getstate_support:
state = self.flatten(obj.__getstate__())
if self.unpicklable:
data[tags.STATE] = state
else:
data = state
return data
# hack for zope persistent objects; this unghostifies the object
getattr(obj, '_', None)
return self._flatten_dict_obj(obj.__dict__, data)
if has_slots:
return self._flatten_newstyle_with_slots(obj, data)
def _flatten_obj_instance(self, obj):
"""Recursively flatten an instance and return a json-friendly dict
"""
data = {}
has_class = hasattr(obj, '__class__')
has_dict = hasattr(obj, '__dict__')
has_slots = not has_dict and hasattr(obj, '__slots__')
has_getstate = has_dict and hasattr(obj, '__getstate__')
has_getstate_support = has_getstate and hasattr(obj, '__setstate__')
HandlerClass = handlers.registry.get(type(obj))
if (has_class and not util.is_repr(obj) and
not util.is_module(obj)):
module, name = _getclassdetail(obj)
if self.unpicklable is True:
data[tags.OBJECT] = '%s.%s' % (module, name)
# Check for a custom handler
if HandlerClass:
handler = HandlerClass(self)
return handler.flatten(obj, data)
if util.is_module(obj):
if self.unpicklable is True:
data[tags.REPR] = '%s/%s' % (obj.__name__,
obj.__name__)
else:
data = unicode(obj)
return data
if util.is_repr(obj):
if self.unpicklable is True:
data[tags.REPR] = '%s/%s' % (obj.__class__.__module__,
repr(obj))
else:
data = unicode(obj)
return data
if util.is_dictionary_subclass(obj):
return self._flatten_dict_obj(obj, data)
if util.is_noncomplex(obj):
return [self.flatten(v) for v in obj]
if has_dict:
# Support objects that subclasses list and set
if util.is_collection_subclass(obj):
return self._flatten_collection_obj(obj, data)
# Support objects with __getstate__(); this ensures that
# both __setstate__() and __getstate__() are implemented
if has_getstate_support:
state = self.flatten(obj.__getstate__())
if self.unpicklable:
data[tags.STATE] = state
else:
data = state
return data
# hack for zope persistent objects; this unghostifies the object
getattr(obj, '_', None)
return self._flatten_dict_obj(obj.__dict__, data)
if has_slots:
return self._flatten_newstyle_with_slots(obj, data)
