Esempio n. 1
0
    def _restore_object(self, obj):
        class_name = obj[tags.OBJECT]
        #print '_restore_object>', class_name
        handler = handlers.get(class_name)
        if handler is not None: # custom handler
            instance = handler(context=self).restore(obj)
            return self._mkref(instance)

        cls = loadclass(class_name)
        if cls is None:
            return self._mkref(obj)

        return self._restore_object_instance(obj, cls)
Esempio n. 2
0
    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 = hasattr(obj, '__getnewargs__')
        has_getinitargs = hasattr(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__')

        if has_class:
            cls = obj.__class__
        else:
            cls = type(obj)

        # Check for a custom handler
        class_name = util.importable_name(cls)
        handler = handlers.get(class_name)
        if handler is not None:
            if self.unpicklable:
                #GWV change
                data[tags.OBJECT] = util.namespace_name(handler, cls)
            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:
                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)

        self._pickle_warning(obj)
        return None