@corrupt_exception decorator

chaos_lib.py

def corrupt_exception(func):
    def wrapper(*args, **kwargs):
        result = func(*args, **kwargs)
        exception_msg, rate = get_config('exception_msg')
        if not exception_msg:
            return result
        print("exception_msg from config {0} with a rate of {1}".format(exception_msg, rate))
        # add injection approx rate% of the time
        if random.random() <= rate:
            print("corrupting now")
            raise Exception(exception_msg)
        else:
            return result
return wrapper