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Rain CloudFormation Experiments

Experimentation with Rain - a CloudFormation workflow tool.

Pre-requisites

  1. Rain - install using brew install rain
  2. NodeJS 20
  3. Python 3.12
  4. AWS CLI

Goals

Primary goals of the experimentation:

  • Multi-module deployments with multiple CloudFormation Stacks
  • Easy deployments of lambda functions
  • Structure of lambdas for easy deployments
    • TypeScript - correct tsconfig settings and bundling the code into a single file along with dependencies using esbuild
    • Python - Directory structure for installing dependencies and create a layer

Usage

Check the following main targets of the Makefile and their target dependencies for usage of various commands.

  • make deploy-multi-mod: deploys multi-module stacks
  • make deploy-ts-lambda: packages and deploys MiddyJS-based TypeScript NodeJS 20.x lambda. Test the lambda invocation using make test-ts-lambda
  • make deploy-py-lambda: packages dependencies layers and deploys Python 3.12 lambda. Test the lambda invocation using make test-py-lambda

https://how.wtf/a-guide-for-deploying-cloudformation-with-cli-using-rain.html is a good introductory article on Rain.