offline-lambda

Testing an AWS Lambda offline.

Repo for testing a lambda function locally.

Details

• event.json: file that contains the lambda event
• lambda/: lambda code

Usage

Command for invoking lambda.Starting the Docker container corresponds to an AWS Lambda cold start.

docker-compose run lambda lambda.handler.lambda_handler "$(cat event.json)"

Command for keeping the container of our Lambda function running: you can make several consecutive calls quickly without waiting for the “cold start” times.

docker-compose run -e DOCKER_LAMBDA_STAY_OPEN=1 lambda lambda.handler.lambda_handler "$(cat event.json)"

References & Acknowledgments

Special Thanks for Vittorio Nardone for the medium post:

• https://levelup.gitconnected.com/aws-lambda-offline-development-with-docker-6a8cf8b186e7
• https://hub.docker.com/r/lambci/lambda/