def validate_input(function):
    """Decorator that validates the kwargs of the function passed to it."""
    @wraps(function)
    def wrapper(*args, **kwargs):
        try:
            name = function.__name__ + '_validator'  # find validator name
            globals()[name](kwargs)  # call validation function
            return function(*args, **kwargs)
        except KeyError:
            raise Exception("Could not find validation schema for the"
                            " function " + function.__name__)
    return wrapper
Decorator that validates the kwargs of the function passed to it.