aws-lambda-haskell

This package makes it easy to run AWS Lambda Functions written in Haskell.

Example function

Examples can be found in the examples directory.

In order to build them you'll need to fetch the fpco/stack-build:lts-12.14 docker image. The run stack build in the root directory.

Deployment

• Build the executable (you'll need to target your executable for an x86_64-linux platform). Compilation is that case is done through stack but any other tool would be fine.

It's advised to build the executable without the --threaded flag. AWS lambdas run in a single thread.

stack build

• Create a zip file with the executable file. The file name must be "bootstrap".

cp $(stack exec -- which aws-lambda-haskell-simple-example-exe) ./bootstrap && zip demo.zip bootstrap && rm bootstrap

• Create an execution role for the lambda

aws iam create-role --role-name lambda-demo --assume-role-policy-document file://./examples/simple/trust-policy.json
aws iam attach-role-policy --role-name lambda-demo --policy-arn arn:aws:iam::aws:policy/service-role/AWSLambdaBasicExecutionRole

• Create the lambda

aws lambda create-function --function-name demo \
--role <the-arn-of-the-role-that-was-created-in-the-previous-step> \
--runtime provided --timeout 15 --memory-size 128 \
--handler demo --zip-file fileb://demo.zip

• Invoke it

aws lambda invoke --function-name demo --payload '{"answer":42}' output.txt

Credits

This package is heavily inspired in the runtime for rust and cpp