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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:
 def server_side(func):
 """ Decorator to designate an API method applicable only to server-side instances. This allows us to use the same APIRequest and APIResponse subclasses on the client and server sides without too much confusion. """

    def inner(*args, **kwargs):
        if args and hasattr(args[0], 'is_server') and not voltron.debugger:
            raise ServerSideOnlyException("This method can only be called on a server-side instance")
        return func(*args, **kwargs)
    return inner