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Keep score of the results of functions over time and take action based on a generated score.

Sometimes, you have a problem that requires you to look at a set of circumstances over time and weigh them before taking action like intermittent failures in a system or calls to external APIs that may or may not respond.

For example, maybe you have an API endpoint you’re monitoring and you want to do some self-healing, but only if there are at least 5 failures in 5 minutes. You don’t want to have a long-running process keeping state over 5 minutes, so you need something that will maintain state between calls. That might look something like this:

@score(ShadyAPIScorekeeper, 20, threshold=100, decay=10, callback=restart_shady_api)
def check_shady_api():
    if shady_api_test().successful:
        return True
    else:
        return False

Every time check_shady_api() is called and returns False, the ShadyAPIScorekeeper will accumulate 20 points. Once the threshold of 100 points is reached, the callback will be executed. Because you might execute this script from a cron job or in some other intermittent fashion, the accumulated score for ShadyAPIScorekeeper is persisted on the local file system. Finally, the (optional) decay parameter lets you set the number of seconds it takes for the accumulated score to tick down by 1 point.

In this example, ShadyAPIScorekeeper is just a subclass of Scorekeeper and can have its own defaults set for things like threshold, decay, and callback. This allows the decorator invocation to be much leaner. In addition, all instances of a given subclass of Scorekeeper use the same persisted score, so you could decorate multiple functions all with different points based on their severity in order to generate your final score and decide whether or not to take action.

In addition to using Scorekeeper as a decorator, you can also just directly interface with the objects you’ve described. For example:

>>> score_keeper = ShadyApiScorekeeper()
>>> score_keeper.score
0
>>> score_keeper(10)
>>> score_keeper.score
10
>>> score_keeper(100)
Shady API restarted!

Features

  • TODO

Credits

This package was created with Cookiecutter and the audreyr/cookiecutter-pypackage project template.

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