ci-cd.yml

# This workflow will build docker image and push it to DockerHub,
# After that, This wrkflow build and push a new container image to Amazon ECR,
# and then will deploy a new task definition to Amazon ECS, when there is a push to the "main" branch.

name: CI/CD Pipeline  # Name of the CI/CD Pipeline

on:
  push:
    branches: [ "main" ]  # Trigger on push events to the main branch
  pull_request:
    branches: [ "main" ]  # Trigger on pull requests to the main branch

jobs:
  build-and-deploy:
    runs-on: ubuntu-latest  # Runs on the latest version of Ubuntu | Default operating system environment for workflows unless explicitly specified.
    
    steps:
    - name: Checkout code  # Step to checkout the code from the repository | Fetch the source code repository into the runner machine where our workflow is executing. 
      uses: actions/checkout@v4
      
    - name: Set up JDK 17 # Step to set up JDK 17
      uses: actions/setup-java@v3
      with:
        java-version: '17'
        distribution: 'temurin'
        cache: maven
        
    - name: Build with Maven # Step to build the project with Maven
      run: mvn clean install

    - name: build and push the docker image to dockerhub
      run: |
        # 1. Login to DockerHub
        # 2. Build the Docker image
        # 3. Push the Docker image to DockerHub
        docker login -u ${{secrets.DOCKER_USERNAME}} -p ${{secrets.DOCKER_PASSWORD}} 
        docker build -t dharshib/springboot-ci-cd .  
        docker push dharshib/springboot-ci-cd:latest 

    - name: Configure AWS credentials
      uses: aws-actions/configure-aws-credentials@v4
      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: Login to Amazon ECR
      id: login-ecr
      uses: aws-actions/amazon-ecr-login@v2

    # Instead of ECR we can also push the image to Dockhub and pull it to ECS.
    - name: Build, tag, and push image to Amazon ECR
      id: build-image
      env:
        ECR_REGISTRY: ${{ steps.login-ecr.outputs.registry }}
        IMAGE_TAG: ${{ github.sha }}
      run: |
        # Build a docker container and
        # push it to ECR so that it can
        # be deployed to ECS.
        docker build -t $ECR_REGISTRY/${{ secrets.ECR_REPOSITORY }}:$IMAGE_TAG .
        docker push $ECR_REGISTRY/${{ secrets.ECR_REPOSITORY }}:$IMAGE_TAG
        echo "image=$ECR_REGISTRY/${{ secrets.ECR_REPOSITORY }}:$IMAGE_TAG" >> $GITHUB_OUTPUT

    # Updating our ECS task definition file with the newly built Docker image ID 
    # after successfully building and pushing the Docker image to Amazon ECR. 
    - name: Update ECS task definition with new image 
      id: task-def
      uses: aws-actions/amazon-ecs-render-task-definition@v1
      with:
        task-definition: ${{ secrets.ECS_TASK_DEFINITION }}
        container-name: ${{ secrets.CONTAINER_NAME }}
        image: ${{ steps.build-image.outputs.image }}

    - name: Deploy the updated ECS task definition
      uses: aws-actions/amazon-ecs-deploy-task-definition@v1
      with:
        task-definition: ${{ steps.task-def.outputs.task-definition }}
        service: ${{ secrets.ECS_SERVICE }}
        cluster: ${{ secrets.ECS_CLUSTER }}
        wait-for-service-stability: true