How to trigger lambda after completion of another lambda?

Question

I have two python scripts that I want to run one after another.

Script1 has a trigger on a S3 bucket. After script1 is done, I want to immediately trigger script2.

I am not finding how to set this trigger, but am finding how to chain lambdas and trigger them from inside script1. I think I do not want this. Open to all suggestions.

Answer 1

You're looking for a Lambda trigger based on the "Function Invocation Finished" event. This isn't something natively supported by AWS as far as I'm aware. If you want to keep the functions decoupled, I would have the first function post to an SNS topic whenever it completes, and then have your 2nd function subscribe to that SNS topic.