End to end job to build python app, test, upload to S3 and deploy to existing AWS Lambda

build-test-lambda-deploy

# End to end job to build, test, upload to S3 and deploy to AWS Lambda
# 1. Builds python package installing dependencies in library we can access for ZIP file
# 2. Runs tests with Pytest
# 3. Creates ZIP package for Lambda (date-stamped filename)
# 4. Uploads to your S3 bucket
# 5. Deploys to AWS Lambda function
# Runs on update to main branch
# Because tests are run, the .pyc files are included in the package (faster Lambda run times?)

name: Build, test and deploy to Lambda

on:
  push:
    branches: [main]

env:
  S3_BUCKET: MY_BUCKET_NAME
  LAMBDA_NAME: MY_LAMBDA_FUNCTION_NAME

jobs:

  build-test-deploy:
    name: Build and test
    runs-on: ubuntu-latest
    steps:

      - name: checkout source code
        uses: actions/checkout@v2

      - name: Get current date for filename timestamp
        id: date
        run: echo "DATE=$(date +'%Y%m%d-%H%M')" >> $GITHUB_ENV

      - name: Set up Python
        uses: actions/setup-python@v2
        with:
          python-version: 3.8

      - name: Install dependencies
        run: |
          python -m pip install --upgrade pip
          if [ -f requirements.txt ]; then pip install -r requirements.txt --ignore-installed --target=$GITHUB_WORKSPACE/lib; fi
          python -m pip install pytest requests

      - name: Test with pytest - should have created pyc files
        run: pytest

      - name: Create zip package (include created pyc files)
        shell: bash
        run: |
          cd $GITHUB_WORKSPACE/lib
          ls
          zip -r9 $GITHUB_WORKSPACE/$LAMBDA_NAME-$DATE.zip .
          cd $GITHUB_WORKSPACE
          ls
          zip -g $GITHUB_WORKSPACE/$LAMBDA_NAME-$DATE.zip -r app

      - name: Configure AWS credentials
        uses: aws-actions/configure-aws-credentials@v1
        with:
          aws-access-key-id: ${{ secrets.AWS_ACCESS_KEY_ID }}
          aws-secret-access-key: ${{ secrets.AWS_SECRET_ACCESS_KEY }}
          aws-region: ${{ secrets.AWS_REGION }}

      - name: Copy files to S3
        shell: bash
        run: |
          aws s3 cp $GITHUB_WORKSPACE/$LAMBDA_NAME-$DATE.zip s3://$S3_BUCKET

      - name: Deploy to Lambda
        shell : bash
        run: |
          aws lambda update-function-code --function-name $LAMBDA_NAME --s3-bucket $S3_BUCKET --s3-key $LAMBDA_NAME-$DATE.zip