Lambda meets gophers.
Install aws-lambda-go project
Libraries, samples and tools to help Go developers develop AWS Lambda functions.
go get github.com/aws/aws-lambda-go/lambda
This builds to run in the aws lambda runtime.
./build.sh
This will produce a main.zip file to upload to aws lambda (or s3).
Your value for handler will be simply main.
More info on the lambda execution env: https://docs.aws.amazon.com/lambda/latest/dg/current-supported-versions.html