This project demonstrates how to run a Kotlin serverless function on AWS lambda using GraalVM It takes advantage of the custom lambda runtime to be able to use GraalVM to run the function. This avoids the increased latency on cold startup.
For more information read the post belonging to this repo - https://medium.com/@mathiasdpunkt/fighting-cold-startup-issues-for-your-kotlin-lambda-with-graalvm-39d19b297730
Run the package.sh to create a deployable zip file. This script does the following:
- build a fat jar of the application
- use the
oracle/graalvm-cedocker image to build a native image - package the native image together with the runtime/bootstrap script into
build/package/bundle.zip
We are using the serverless framework to deploy the function.
So to package and deploy run:
npm install
./package.sh
npx serverless deploy
To call the endpoint run:
curl https://<your-api-id-here>.execute-api.eu-central-1.amazonaws.com/dev/greet/some
After calling the function we can look at the logs to get information about the execution time.
npx serverless logs -f hello
#REPORT RequestId: 155aa77e-6f07-4f31-a468-6de06edfd98b Duration: 23.85 ms Billed Duration: 300 ms Memory Size: 1024 MB Max Memory Used: 66 MB Init Duration: 178.22 ms