List intersection action for conditions in feature flags

[Rogalek]

Use case

I was thinking if there is a way to write action for condition in feature flags that can do list Intersection.
https://www.geeksforgeeks.org/python-intersection-two-lists/

Solution/User Experience

So user could provide key: [A, B] and inside AWS Appconfig json there will be stored value: [B, C]
And if at least one elements match for both list that this will match criteria.

Alternative solutions

No response

Acknowledgment

• This feature request meets Powertools for AWS Lambda (Python) Tenets
• Should this be considered in other Powertools for AWS Lambda languages? i.e. Java, TypeScript, and .NET

[boring-cyborg]

Thanks for opening your first issue here! We'll come back to you as soon as we can.
In the meantime, check out the #python channel on our Powertools for AWS Lambda Discord: Invite link

[rubenfonseca]

Interesting, the existing KEY_IN_VALUE does not cover a scenario where both items are lists. Is this something you would be able to contribute with a pull request? I would love to help you merge it.

[Rogalek]

Yes, sure I can try to create PR after Christmas and New Year

[gwlester]

May want a couple of intersections:

• ANY_IN_VALUE
• ALL_IN_VALUE
• NONE_IN_VALUE

[leandrodamascena]

Hi @Rogalek and @gwlester! Thanks for sharing this idea to add more features to our Feature Flags utility. For me, it makes a lot of sense to expand this support. After all, we open up more opportunities to use this utility, such as checking if, given an array, ANY of those elements are present, something that we don't support nowadays because we don't check individual values passed in the context.

Just a small comment:

• ALL_IN_VALUE

We already support it if you use EQUALS.

Do you still have plans to send a PR with these changes @Rogalek? Please let me know and we can work together to get it merged.

[gwlester]

@leandrodamascena
You wrote:
ALL_IN_VALUE
We already support it if you use EQUALS.

They are not the same -- All_IN_VALUE would mean that all in the list are in the value, but does not also mean that all in the value are in the list. EQUAL means that all in the list are in the value and also that all in the value are in the list.

[gwlester]

I think I may be taking a shot at implementing this over the next couple of weeks -- does anyone have any issues with that?

@heitorlessa , @leandrodamascena