Add Lambda dependencies layer (PyGithub, requests)

[ibrahimcesar]

Description

The contribute Lambda function requires external Python dependencies (PyGithub, requests) that need to be packaged as a Lambda layer.

Tasks

Create Lambda Layer

• Create requirements.txt for Lambda

  PyGithub>=2.0.0
  requests>=2.28.0
  

• Build layer for Lambda runtime

  mkdir -p python
  pip install -r requirements.txt -t python/
  zip -r layer.zip python/

• Or use Docker for correct architecture:

  docker run --rm -v $(pwd):/var/task \
    public.ecr.aws/sam/build-python3.11 \
    pip install -r requirements.txt -t python/

Update CDK Stack

• Add Lambda layer definition

  const dependenciesLayer = new lambda.LayerVersion(this, 'DependenciesLayer', {
    code: lambda.Code.fromAsset('lambda/layer.zip'),
    compatibleRuntimes: [lambda.Runtime.PYTHON_3_11],
    description: 'PyGithub and requests dependencies',
  });

• Attach layer to contribute function

  const contributeFunction = new lambda.Function(this, 'ContributeFunction', {
    // ...
    layers: [dependenciesLayer],
  });

Alternative: Bundle Dependencies

• Or use inline dependencies with pip install -t

Acceptance Criteria

• Lambda function can import PyGithub and requests
• No import errors at runtime
• Layer version tracked in CDK

Related Files

• interactive/lambda/contribute.py
• interactive/infra/lib/interactive-stack.ts

Dependencies

• Deploy CDK infrastructure to AWS #29 Deploy CDK infrastructure to AWS