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⚡Haskell runtime for AWS Lambda
9.5 6.3 infernal VS halhal provides an AWS Lambda Custom Runtime environment for your Haskell applications.
Seamlessly deploy your existing Wai application on AWS Lambda.
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The Infernal Machine - An AWS Lambda Custom Runtime for Haskell
Since AWS released custom runtimes, you don't need to play any dirty tricks to get your Haskell programs running on AWS Lambda.
Just call an
infernal entrypoint in your
main function, statically link your binary, and zip it up right. If you want to
use your Lambda to serve API Gateway requests with an existing WAI app, there's a wrapper for that too.
How to write your own Lambda
The easiest way to get started is to use the provided stack template and follow the generated
stack new my-haskell-lambda https://github.com/ejconlon/infernal/raw/master/stack-template.hsfiles
Otherwise you can assemble things yourself:
demofor the right options to build your program
- in a Docker container
- zipped the right way
- with some deps temporarily not in Stackage
Mainmodule and use
runSimpleLambdato run your handler
demo/sam/test.shif you want to use
aws-sam-clito test your program locally
- Deploy to AWS with your tool of choice (Serverless, Terraform + awscli, AWS console, etc)
libs subdir has the library, and
demo has a small example application. They are separate
stack projects because the demo
needs to be built with Docker on OSX. See the
Brewfile for test deps on OSX. Basically, if you have
installed, you can run
make integration-test to check a few cases. When making changes to the stack template, run
Thanks to Nick Tchayka and Theam for aws-lambda-haskell-runtime.
Between reading their implementation and the official documentation
it was pretty easy to get this working.
aws-lambda-haskell-runtime is a great library but I had trouble combining the
with some custom startup logic.
Also thanks to Alexey Kotlyarov and Seek for serverless-haskell. Their API Gateway definitions are
very useful, and I am grateful to not have to hand-roll JSON codecs. I did not introduce the library as a dependency because I wanted to simplify the
definitions a bit and avoid multiple
amazonka dependencies not available in Stackage.
You can find copies of both licenses in the
- Set up CI
- Add to Stackage
- Add other standard events
*Note that all licence references and agreements mentioned in the infernal README section above are relevant to that project's source code only.