py-lambda-action

A Github Action to deploy AWS Lambda functions written in Python with their dependencies in a separate layer. For now, only works with Python 3.6. PRs welcome.

Use

Deploys everything in the repo as code to the Lambda function, and installs/zips/deploys the dependencies as a separate layer the function can then immediately use.

Pre-requisites

In order for the Action to have access to the code, you must use the actions/checkout@master job before it. See the example below.

Structure

Lambda code should be structured normally/as Lambda would expect it.
Dependencies must be stored in a requirements.txt or a similar file (provide the filename explicitly if that's the case).

Environment variables

Stored as secrets or env vars, doesn't matter. But also please don't put your AWS keys outside Secrets.

AWS Credentials
That includes the AWS_ACCESS_KEY_ID, AWS_SECRET_ACCESS_KEY, etc. It's used by awscli, so the docs for that can be found here.

Inputs

lambda_layer_arn
The ARN for the Lambda layer the dependencies should be pushed to without the version (every push is a new version).
lambda_function_name
The Lambda function name. From the AWS docs, it can be any of the following:
- Function name - my-function
- Function ARN - arn:aws:lambda:us-west-2:123456789012:function:my-function
- Partial ARN - 123456789012:function:my-function
requirements_txt The name/path for the requirements.txt file. Defaults to requirements.txt.

Example workflow

name: deploy-py-lambda
on:
  push:
    branches:
      - master
jobs:
  build:
    runs-on: ubuntu-latest
    
    steps:
    - uses: actions/checkout@master
    - name: Deploy code to Lambda
      uses: mariamrf/py-lambda-action@v1.0.0
      with:
        lambda_layer_arn: 'arn:aws:lambda:us-east-2:123456789012:layer:my-layer'
        lambda_function_name: 'my-function'
      env:
        AWS_ACCESS_KEY_ID: ${{ secrets.AWS_ACCESS_KEY_ID }}
        AWS_SECRET_ACCESS_KEY: ${{ secrets.AWS_SECRET_ACCESS_KEY }}
        AWS_DEFAULT_REGION: 'us-east-2'