Rust Lambda with SAM

Notes and example of how to build a rust lambda with SAM.

All of this is very much based on this talk from Luciano Mammino at Rust Dublin.

Prerequisites

• Rust
• Cargo Lambda
• SAM Cli

Notes

• samconfig.toml configures the sam project. The name of the stack and some other parameters. The sam deploy --guided command asks for some defaults and updates the config
• SAM deploys the resources that are defined in template.yaml (or something else defined in the config).
• If you change the lambda code you need to sam build before you can sam deploy again. If you dont sam wont see changes (there was no new artefact build)
• Sam creates the Role for the Lambda implictly. The guided deploy asks for that. Or create the role in template.yaml yourself and set it in AWS::Serverless::Function
• The local development of cargo lambda works alongside the sam provided tooling
• The fact that there is an Event Resource in the Function Resource alone makes SAM create an apigateway.

????

• How to connect an application loadbalancer?
• Or just an http function url?

Other Resources

• https://github.com/awslabs/aws-lambda-rust-runtime/tree/main/examples
• https://github.com/lmammino/earthquake-notifier/tree/main