babashka-lambda

Babashka script packaged as AWS Lambda.

This example requires GNU Make, Docker, and AWS CLI, babashka, clojure.

Usage

With AWS SAM CLI

Build: sam build

Deploy: sam deploy --guided (and just sam deploy thereafter)

Test locally: sam local invoke --event events/event-cloudwatch-event.json --debug

With CloudFormation

Provide stack for cloudformation stack name and s3-bucket params.

make stack="babashka-lambda" s3-bucket="my-bucket" deploy

Make sure that your provided S3 bucket, e.g. my-bucket exists. And of course, make sure you are authorized to deploy to AWS.

Test Lambda with AWS CLI

make function-name=$(make get-function-name) invoke-function

The response should be similar:

{"test":"test914"}{
    "StatusCode": 200,
    "ExecutedVersion": "$LATEST"
}

Get the function name:

Development

Open src/lambda/core.clj and implement your handler-fn.

handler-fn is a function that takes in clojure map that is parsed from the request body.

Details

make build

Will create function.zip archive that is ready to be deployed as AWS Lambda into a custom runtime.

The contents of function.zip are:

$ ls -a
  .  ..  bb  bootstrap  cp  deps.edn  .gitlibs  .m2  resources  src

Where:

• bb: babashka binary
• bootstrap: AWS Lambda entry point script
• cp: generated classpath text file
• deps.edn
• .gitlibs: directory with gitlibs
• .m2: directory with Maven dependencies
• resources:
• src: directory with babashka scripts