lambda_go/

README

Minimum projects for containerized Lambdas in Go, using three different base images:

1. An AWS provided docker image
2. A custom Alpine docker image
3. A scratch Docker image

Build Docker Image

You can build each image by running the following command in subdirectories containing a Docker file:

$ DOCKER_BUILDKIT=1 docker build -t lambdago .

• If you want to keep a docker image for each project, use a different name for each image
• You can use the local Makefile to build all the images: make build

Install AWS Lambda Runtime Interface Emulator (RIE)

Because the RIE is not integrated in the images, you need to install it on the host machine to perform local tests:

mkdir -p ~/.aws-lambda-rie && curl -Lo ~/.aws-lambda-rie/aws-lambda-rie \
https://github.com/aws/aws-lambda-runtime-interface-emulator/releases/latest/download/aws-lambda-rie \
&& chmod +x ~/.aws-lambda-rie/aws-lambda-rie

Note: The RIE needs to be installed only once.

Local Testing

Start Lambda

You need to start the lambda using the RIE installed on the host:

$ docker run --rm  -v ~/.aws-lambda-rie:/aws-lambda -p 9000:8080 --entrypoint /aws-lambda/aws-lambda-rie lambdago /main

Send Request

$ curl -v POST "http://localhost:9000/2015-03-31/functions/function/invocations" -d '{"body": "{ \"name\": \"jon\", \"age\": 10 }"}'
{"statusCode":200,"headers":null,"multiValueHeaders":null,"body":"{\"message\":\"jon is 10 years old!\"}"}