aws_pylambda_sam_builder 0.1.0

A tool for building AWS Lambda functions from Python projects.

AWS Python Lambda SAM Builder

Like https://github.com/serverless/serverless-python-requirements but much simpler and for AWS SAM.

Speeds up cross-building for x86_64 on ARM64 by using a local cache.

Usage

Put a Makefile (SAM requires capital M and a make target that matches the logical resources name) in your lambda function top dir:

install-builder:
	@python -c "import aws_pylambda_sam_builder" || @pip install aws_pylambda_sam_builder

.PHONY: build-YourLambda
build-YourLambda: install-builder
	@python -m aws_pylambda_sam_builder --aws-runtime py311 --aws-architecture x86_64 --source ./ --destination $(ARTIFACTS_DIR)

Set your SAM config to build with Makefile:

Resources:
  YourLambda:
    Metadata:
      BuildMethod: makefile

Now sam build --build-in-source --cached -t template.yaml YourLambda uses per-package caching, doesn't need a container, and builds in 100ms after the first build.

Issues

• probably not safe for concurrent builds
• can't build from source (only does binary wheels)
• requires all transitive deps to be listed in requirements.txt. I did poetry export -f initial_requirements.txt -o requirements.txt --without-hashes