deploy.yml

name: Deploy to EC2 (Blue-Green)

on:
  push:
    branches:
      - develop
      - main
  workflow_dispatch:

jobs:
  deploy:
    runs-on: ubuntu-latest

    env:
      SLACK_DEV_WEBHOOK_URL: ${{ secrets.SLACK_DEV_WEBHOOK_URL }}
      SLACK_PROD_WEBHOOK_URL: ${{ secrets.SLACK_PROD_WEBHOOK_URL }}
      SERVICES: "gateway-service help-service notification-service review-service point-service user-service config-server eureka-server"
      EC2_HOST: ${{ secrets.EC2_HOST }}

    steps:
      - name: Checkout
        uses: actions/checkout@v4
        with:
          fetch-depth: 0

      - name: Set up Docker Buildx
        uses: docker/setup-buildx-action@v3

      - name: Login to DockerHub
        uses: docker/login-action@v3
        with:
          username: ${{ secrets.DOCKER_USERNAME }}
          password: ${{ secrets.DOCKER_PASSWORD }}

      - name: Define TAG
        id: define_tag
        run: echo "TAG=$(date +'%Y%m%d%H%M%S')" >> $GITHUB_ENV

      - name: Detect Changed Services
        id: detect_services
        run: |
          CHANGED_FILES=$(git diff --name-only ${{ github.event.before }} ${{ github.sha }})
          if echo "$CHANGED_FILES" | grep -Eq '(^build.gradle|^settings.gradle|^gradlew|^gradlew\.bat|^build\.gradle\.kts|^common/)'; then
            echo "CHANGED=ALL" >> $GITHUB_ENV
          else
            CHANGED=$(echo "$CHANGED_FILES" \
              | grep -E '^(gateway-service|help-service|notification-service|review-service|point-service|user-service|config-server|eureka-server)/' \
              | awk -F/ '{print $1}' | sort -u | xargs)
            echo "CHANGED=$CHANGED" >> $GITHUB_ENV
          fi
      - name: Count existing services on EC2
        id: remote_count
        uses: appleboy/ssh-action@v0.1.8
        with:
          host:     ${{ secrets.EC2_HOST }}
          username: ${{ secrets.EC2_USER }}
          key:      ${{ secrets.EC2_SSH_KEY }}
          port:     22
          sync:     true
          script: |
            docker ps \
              --filter name=gateway-blue \
              --filter name=gateway-green \
              --filter name=help-service \
              --filter name=notification-service \
              --filter name=review-service \
              --filter name=point-service \
              --filter name=user-service \
              --filter name=config-server \
              --filter name=eureka-server \
              --format '{{.Names}}' | wc -l
      - name: Export EXISTING_COUNT
        run: |
          RAW="${{ steps.remote_count.outputs.stdout || '0' }}"
          NUM=$(echo "$RAW" | tr -cd '0-9')
          echo "EXISTING_COUNT=$NUM" >> $GITHUB_ENV
      - name: Decide whether to skip deploy
        run: |
          echo "Existing containers: $EXISTING_COUNT"
          if [ -z "$CHANGED" ] && [ "$EXISTING_COUNT" -gt 13 ]; then
            echo "No changes & already deployed → skipping"
            exit 0
          fi
      - name: Build & Push images
        id: build_push
        run: |
          if [ "$CHANGED" = "ALL" ] || { [ -z "$CHANGED" ] && [ "$EXISTING_COUNT" -le 13 ]; }; then
            TARGETS=($SERVICES)
          else
            TARGETS=($CHANGED)
          fi
          echo "Deploy targets: ${TARGETS[*]}"
          # for svc in "${TARGETS[@]}"; do
            # docker build -t namgyu967/$svc:${TAG} -f $svc/Dockerfile .
            # docker push namgyu967/$svc:${TAG}
            # docker tag namgyu967/$svc:${TAG} namgyu967/$svc:latest
            # docker push namgyu967/$svc:latest
          # done
          echo "TARGETS=${TARGETS[*]}" >> $GITHUB_ENV
      - name: EC2에 Blue-Green 및 서비스 배포
        uses: appleboy/ssh-action@master
        with:
          host:             ${{ secrets.EC2_HOST }}
          username:         ${{ secrets.EC2_USER }}
          key:              ${{ secrets.EC2_SSH_KEY }}
          port:             22
          protocol:         tcp
          timeout:          30s
          command_timeout:  10m
          sync:             true
          capture_stdout:   true
          curl_insecure:    false

          envs: |
            TAG=${{ env.TAG }}
            SERVICES=${{ env.SERVICES }}
            CHANGED=${{ env.CHANGED }}
          script: |
            set -e
            cd ~/timebank
            source .env-tag

            # 0) nginx 보장
            docker-compose up -d nginx

            # 1) Blue-Green gateway
            if docker-compose ps | grep -q gateway-blue; then
              NEW=green; OLD=blue
            else
              NEW=blue;  OLD=green
            fi
            docker-compose pull gateway-$NEW
            docker-compose up -d gateway-$NEW
            sed -i "s/server gateway-$OLD:8080;/server gateway-$NEW:8080;/" nginx-conf/gw.conf
            docker exec nginx nginx -s reload

            # 2) deploy 대상 계산
            if [ "$CHANGED" = "ALL" ] || [ -z "$CHANGED" ]; then
              IFS=' ' read -r -a targets <<< "$SERVICES"
            else
              IFS=' ' read -r -a targets <<< "$CHANGED"
            fi

            echo "=== DEBUG:Final deploy targets ==="
            for svc in "${targets[*]}"; do
              echo " - $svc"
            done

            # 3) 나머지 서비스 순차 배포
            for svc in "${targets[*]}"; do
              [ "$svc" = "gateway-service" ] && continue
              echo "Deploying $svc..."
              docker-compose pull $svc
              docker-compose up -d $svc
            done


      - name: 헬스체크 및 결과 수집
        id: health
        shell: bash
        run: |
          set +e
          SUCCESS=""; FAILED=""
          BASE="http://${{ env.EC2_HOST }}"
          # 헬스체크 대상도 동일하게 계산
          if [ "${CHANGED}" = "ALL" ] || [ -z "${CHANGED}" ]; then
            IFS=' ' read -r -a targets <<< "${SERVICES}"
          else
            IFS=' ' read -r -a targets <<< "${CHANGED}"
          fi
          for svc in "${targets[@]}"; do
            if [ "$svc" = "gateway-service" ]; then
              END="$BASE/actuator/health"
            else
              END="$BASE/$svc/actuator/health"
            fi
            for i in {1..10}; do
              sleep 5
              CODE=$(curl -s -o /dev/null -w "%{http_code}" "$END" || echo "000")
              if [ "$CODE" = "200" ]; then
                SUCCESS="$SUCCESS $svc"
                break
              fi
              [ "$i" -eq 10 ] && FAILED="$FAILED $svc"
            done
          done
          echo "SUCCESS=${SUCCESS:-none}" >> $GITHUB_ENV
          echo "FAILED=${FAILED:-none}" >> $GITHUB_ENV
      - name: Slack Notification (Success)
        if: success()
        uses: slackapi/slack-github-action@v1.24.0
        with:
          payload: |
            {
              "text": "${{ github.ref == 'refs/heads/main' && ':white_check_mark: *[PROD]* 배포 성공!*' || ':white_check_mark: *[DEV]* 배포 성공!*' }}\n> 대상: ${{ env.TARGETS || 'all' }}\n> 정상: ${{ env.SUCCESS }}\n> 실패: ${{ env.FAILED }}\n> 태그: ${{ env.TAG }}\n> Eureka Server: http://${{ env.EC2_HOST }}:8761"
            }
        env:
          SLACK_WEBHOOK_URL: ${{ github.ref == 'refs/heads/main' && secrets.SLACK_PROD_WEBHOOK_URL || secrets.SLACK_DEV_WEBHOOK_URL }}

      - name: Slack Notification (Failure)
        if: failure()
        uses: slackapi/slack-github-action@v1.24.0
        with:
          payload: |
            {
              "text": "${{ github.ref == 'refs/heads/main' && ':x: *[PROD]* 배포 실패!*' || ':x: *[DEV]* 배포 실패!*' }}\n> 에러 확인해주세요."
            }
        env:
          SLACK_WEBHOOK_URL: ${{ github.ref == 'refs/heads/main' && secrets.SLACK_PROD_WEBHOOK_URL || secrets.SLACK_DEV_WEBHOOK_URL }}