def _deserialize_custom_object()

in azure/functions/_durable_functions.py [0:0]

• 12 lines of code
• 5 McCabe index (conditional complexity)

def _deserialize_custom_object(obj: dict) -> object:
    """Deserialize a user-defined object from JSON.

    Deserializes a dictionary encoding a custom object,
    if it contains class metadata suggesting that it should be
    decoded further.

    Parameters:
    ----------
    obj: dict
        Dictionary object that potentially encodes a custom class

    Returns:
    --------
    object
        Either the original `obj` dictionary or the custom object it encoded

    Exceptions
    ----------
    TypeError
        If the decoded object does not contain a `from_json` function
    """
    if ("__class__" in obj) and ("__module__" in obj) and ("__data__" in obj):
        class_name = obj.pop("__class__")
        module_name = obj.pop("__module__")
        obj_data = obj.pop("__data__")

        # Importing the clas
        module = import_module(module_name)
        class_ = getattr(module, class_name)

        if not hasattr(class_, "from_json"):
            raise TypeError(f"class {type(obj)} does not expose a `from_json` "
                            "function")

        # Initialize the object using its `from_json` deserializer
        obj = class_.from_json(obj_data)
    return obj