AWS Lambda deploy action for Python code

Action works with functions written in Python 3.8 with dependencies on separate layer.

Usage

Action deploys code from the repo to the AWS Lambda function, and installs/zips/deploys the dependencies as a separate layer.

Inputs

• lambda_function_name The Lambda function name. (required)
• lambda_layer_arn The ARN of the Lambda layer for dependencies. (optional)
• requirements_txt The name for the requirements.txt file. (Defaults is requirements.txt)
• lambda_region Lambda function region name (Default is us-east-1)

Note, that if lambda_layer_arn wasn't defined in action call or requirements_txt wasn't changed last commit - only lambda code will be deployed, without dependencies. It could be useful during lambda development, but dependencies never change or deploy lambda code without dependencies.

Environment variables

AWS Credentials

• AWS_ACCESS_KEY_ID
• AWS_SECRET_ACCESS_KEY

Credentials are used by awscli for lambda code deployment to AWS.

Below you can find minimal policy requirements for these credentials. Also see example how to use github secrets for credentials transition. Don't commit working AWS credentials into your repo even for private one! Use github repo secrets for such purpose.

Example action code:

Deploy lambda:

name: Deploy lambda 

on:
  push:
    branches:
      - master

jobs:
  deploy:
    runs-on: ubuntu-latest
    steps:
    - uses: actions/checkout@master
    - name: Deploy code to Lambda
      uses: denzalman/lambda-python-action@v2.0.0
      with:
        lambda_layer_arn: 'arn:aws:lambda:us-east-1:<AWS_ACCOUNT_ID>:layer:<lambda_layer_name>'
        lambda_function_name: 'lambda_function_name'
        lambda_region: 'us-east-1'
        requirements_txt: 'requirements.txt'
      env:
        AWS_ACCESS_KEY_ID: ${{ secrets.AWS_ACCESS_KEY_ID }}
        AWS_SECRET_ACCESS_KEY: ${{ secrets.AWS_SECRET_ACCESS_KEY }}

AWS Policy

Minimal AWS credentials policy needed for the action credentials:

{
  "Version": "2012-10-17",
  "Statement": [
    {
      "Effect": "Allow",
      "Action": [
        "s3:PutObject",
        "iam:ListRoles",
        "lambda:*"
      ],
      "Resource": [
        "arn:aws:lambda:*:<AWS_ACCOUNT_ID>:function:<lambda_function_name>*"
      ]
    }
  ]
}