nix-playgraound/23-haskell-maybe-either/README.md

23-haskell-maybe-either

This example shows intermediate Haskell request building with Maybe and Either.

It includes:

• optional fields read through Maybe,
• required fields upgraded from Maybe into Either errors,
• validation for rollout strategy and canary percentage, and
• a test suite run by nix flake check.

Useful commands:

nix develop
cabal run
cabal run -- service=api env=production replicas=3 strategy=canary canary=10 owner=platform
cabal test

nix build
./result/bin/mini-release-request service=api env=production replicas=3 strategy=canary canary=10 owner=platform

nix run . -- service=api env=production replicas=3 strategy=canary canary=10 owner=platform
nix flake check