deploy-to-ec2.yml

name: Build and Deploy to AWS

on:
  push:
    branches:
      - main

jobs:
  build-and-deploy:
    runs-on: ubuntu-latest

    steps:
      - name: Checkout code
        uses: actions/checkout@v2

      - name: Set up Docker Buildx
        uses: docker/setup-buildx-action@v1

      - name: Log in to Docker Hub
        uses: docker/login-action@v1
        with:
          username: ${{ secrets.DOCKER_HUB_USERNAME }}
          password: ${{ secrets.DOCKER_HUB_ACCESS_TOKEN }}

      - name: Build and push Docker image of Flask app
        uses: docker/build-push-action@v2
        with:
          context: .
          file: ./flask.Dockerfile
          push: true
          tags: ${{ secrets.DOCKER_HUB_USERNAME }}/flask-app-image-repository:latest
          build-args: |
            FLASK_KEY=${{ secrets.FLASK_KEY }}
            SPOTIFY_CLIENT_ID=${{ secrets.SPOTIFY_CLIENT_ID }}
            SPOTIFY_SECRET_ID=${{ secrets.SPOTIFY_SECRET_ID }}
            ENVIRONMENT=${{ secrets.ENVIRONMENT }}

      - name: Set up AWS CLI
        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: Retrieve EC2 instance IPs
        id: get_instances_ips
        run: |
          aws ec2 describe-instances --filters "Name=tag:Name,Values=ec2-1" "Name=instance-state-name,Values=running" --query "Reservations[*].Instances[*].PublicIpAddress" --output text > ec2_instance_ip_1.txt
          echo "EC2_1_IP=$(cat ec2_instance_ip_1.txt)" >> $GITHUB_ENV
          aws ec2 describe-instances --filters "Name=tag:Name,Values=ec2-2" "Name=instance-state-name,Values=running" --query "Reservations[*].Instances[*].PublicIpAddress" --output text > ec2_instance_ip_2.txt
          echo "EC2_2_IP=$(cat ec2_instance_ip_2.txt)" >> $GITHUB_ENV
          aws ec2 describe-instances --filters "Name=tag:Name,Values=ec2-3" "Name=instance-state-name,Values=running" --query "Reservations[*].Instances[*].PublicIpAddress" --output text > ec2_instance_ip_3.txt
          echo "EC2_3_IP=$(cat ec2_instance_ip_3.txt)" >> $GITHUB_ENV

      - name: Create .ssh directory
        run: mkdir -p /home/runner/.ssh

      - name: Create SSH key file
        run: echo "${{ secrets.SSH_PRIVATE_KEY }}" > /home/runner/.ssh/id_rsa

      - name: Set SSH key permissions
        run: chmod 600 /home/runner/.ssh/id_rsa

      - name: Update EC2 with new Docker image
        run: |
          ssh -o StrictHostKeyChecking=no -i /home/runner/.ssh/id_rsa ubuntu@${{ env.EC2_1_IP }} << 'EOF'
            docker pull ${{ secrets.DOCKER_HUB_USERNAME }}/flask-app-image-repository:latest
            docker stop my-container || true
            docker rm my-container || true
            docker run -d --name my-container -p 80:5000 ${{ secrets.DOCKER_HUB_USERNAME }}/flask-app-image-repository:latest
          EOF
          ssh -o StrictHostKeyChecking=no -i /home/runner/.ssh/id_rsa ubuntu@${{ env.EC2_2_IP }} << 'EOF'
            docker pull ${{ secrets.DOCKER_HUB_USERNAME }}/flask-app-image-repository:latest
            docker stop my-container || true
            docker rm my-container || true
            docker run -d --name my-container -p 80:5000 ${{ secrets.DOCKER_HUB_USERNAME }}/flask-app-image-repository:latest
          EOF
          ssh -o StrictHostKeyChecking=no -i /home/runner/.ssh/id_rsa ubuntu@${{ env.EC2_3_IP }} << 'EOF'
            docker pull ${{ secrets.DOCKER_HUB_USERNAME }}/flask-app-image-repository:latest
            docker stop my-container || true
            docker rm my-container || true
            docker run -d --name my-container -p 80:5000 ${{ secrets.DOCKER_HUB_USERNAME }}/flask-app-image-repository:latest
          EOF
      - name: Make shell script template for updating autoscaling instances
        run: |
          echo "${{secret.SHELL_SCRIPT_TEMPLATE}}" > update_instance.sh
          cat update_instance.sh

      - name: Retrieve Autoscaling EC2 server IPs
        id: get_autoscaling_instances_ips
        run: |
          aws autoscaling describe-auto-scaling-instances --query "AutoScalingInstances[*].InstanceId" --output text > autoscaling_instance_ids.txt 
          aws ec2 describe-instances --instance-ids $(cat autoscaling_instance_ids.txt) --query "Reservations[*].Instances[*].PublicIpAddress" --output text > autoscaling_instance_ips.txt
          cat autoscaling_instance_ips.txt
          ips_file="autoscaling_instance_ips.txt"
          IFS=$'\n' read -d '' -r -a ips < "$ips_file"
          for i in "${!ips[@]}"; do
            echo "Auto_Instance_IP_$((i+1)): ${ips[i]}" >> $GITHUB_ENV
            touch update_instance_$((i+1)).sh
            # copy the shell script template to the new file
            cp update_instance.sh update_instance_$((i+1)).sh
            # replace the placeholder with the actual IP
            sed -i "s/IP_PLACEHOLDER/${ips[i]}/g" update_instance_$((i+1)).sh
            # make the new file executable
            chmod +x update_instance_$((i+1)).sh
           # show the content of the new file
            cat update_instance_$((i+1)).sh
          done

      - name: Update Autoscaling EC2 with new Docker image
        run: |
          cat autoscaling_instance_ips.txt
          ips_file="autoscaling_instance_ips.txt"
          IFS=$'\n' read -d '' -r -a ips < "$ips_file"
          for i in "${!ips[@]}"; do
            ssh -o StrictHostKeyChecking=no -i /home/runner/.ssh/id_rsa ubuntu@${ips[i]} << 'EOF'
              docker pull ${{ secrets.DOCKER_HUB_USERNAME }}/flask-app-image-repository:latest
              docker stop my-container || true
              docker rm my-container || true
              docker run -d --name my-container -p 80:5000 ${{ secrets.DOCKER_HUB_USERNAME }}/flask-app-image-repository:latest
            EOF
          done
          
          

    env:
      AWS_DEFAULT_REGION: ${{ secrets.AWS_DEFAULT_REGION }}
      AWS_REGION: ${{ secrets.AWS_REGION }}
      AWS_ACCESS_KEY_ID: ${{ secrets.AWS_ACCESS_KEY_ID }}
      AWS_SECRET_ACCESS_KEY: ${{ secrets.AWS_SECRET_ACCESS_KEY }}
      DOCKER_HUB_USERNAME: ${{ secrets.DOCKER_HUB_USERNAME }}