cd-lambda-function.yml

name: Deploy lambda function to AWS Lambda

on:
  push:
    branches: 
      - master
    paths: # this workflow is executed if there is at least one change in
      - 'packages/lambda/**'

env:
  AWS_REGION: us-east-1
  AWS_ECR_REPOSITORY_NAME: rtv-ecr-repo
  AWS_LAMBDA_FUNCTION_NAME: rtv-lambda
  AWS_ACCESS_KEY_ID: ${{ secrets.AWS_ACCESS_KEY_ID }}
  AWS_SECRET_ACCESS_KEY: ${{ secrets.AWS_SECRET_ACCESS_KEY }}

defaults:
  run: # provide default options for all run steps in workflow
    shell: bash
    working-directory: packages/lambda

jobs:
  deploy:
    name: Deploy lambda function
    runs-on: ubuntu-latest

    steps: # each step is isolated from other
      - name: Checkout
        uses: actions/checkout@v2

      - name: Authenticate docker client to ECR registry
        id: login-ecr
        uses: aws-actions/amazon-ecr-login@v1 # equivalent to execute: aws ecr get-login-password --region <AWS_REGION> | docker login --username AWS --password-stdin <AWS_ACCOUNT_ID>.dkr.ecr.<AWS_REGION>.amazonaws.com

      # - name: Delete the previous images of the ECR repository, if exists
      #   run: |
      #     IMAGES_TO_DELETE=$( \
      #       aws ecr list-images \
      #         --region $AWS_REGION \
      #         --repository-name $AWS_ECR_REPOSITORY_NAME \
      #         --query 'imageIds[*]' \
      #         --output json \
      #     )
      #     aws ecr batch-delete-image \
      #       --region $AWS_REGION \
      #       --repository-name $AWS_ECR_REPOSITORY_NAME \
      #       --image-ids "$IMAGES_TO_DELETE" \
      #       || true

      - name: Build, tag, and push docker image to ECR repository
        id: build-image
        env:
          ECR_REGISTRY_URI: ${{ steps.login-ecr.outputs.registry }} # seems like: <AWS_ACCOUNT_ID>.dkr.ecr.<AWS_REGION>.amazonaws.com
          TAG: ${{ github.sha }}
        # build the docker image already with a tag to the ECR repository, and push the image to ECR repository
        run: |
          IMAGE_URI="$ECR_REGISTRY_URI/$AWS_ECR_REPOSITORY_NAME:$TAG"
          docker build --tag $IMAGE_URI .
          docker push $IMAGE_URI
          echo "::set-output name=image-uri::$IMAGE_URI"

      - name: Update container image of the AWS Lambda
        run: |
          aws configure set region ${{ env.AWS_REGION }}
          aws lambda update-function-code \
            --function-name ${{ env.AWS_LAMBDA_FUNCTION_NAME }} \
            --image-uri ${{ steps.build-image.outputs.image-uri }}