deploy-backend.yml

name: Deploy Backend

# Required GitHub secrets:
#   GCP_SA_KEY            - Service account JSON key (base64 encoded)
#   GCP_VM_IP             - External IP of the GCP VM
#   GCP_VM_SSH_PRIVATE_KEY - SSH private key for connecting to the VM

on:
  push:
    branches: [main]
    paths: [backend/**]
  workflow_dispatch:

concurrency:
  group: deploy-backend
  cancel-in-progress: false

jobs:
  test:
    runs-on: ubuntu-latest
    steps:
      - uses: actions/checkout@v4

      - uses: actions/setup-go@v5
        with:
          go-version-file: go.mod

      - name: Run tests
        run: go test ./backend/... -cover

  deploy:
    needs: test
    runs-on: ubuntu-latest
    steps:
      - uses: actions/checkout@v4

      - uses: actions/setup-go@v5
        with:
          go-version-file: go.mod

      - name: Build static binary
        run: CGO_ENABLED=0 GOOS=linux GOARCH=amd64 go build -o smolterms ./backend/cmd/server/main.go

      - name: Set up SSH key
        run: |
          mkdir -p ~/.ssh
          echo "${{ secrets.GCP_VM_SSH_PRIVATE_KEY }}" > ~/.ssh/id_deploy
          chmod 600 ~/.ssh/id_deploy
          ssh-keyscan -H ${{ secrets.GCP_VM_IP }} >> ~/.ssh/known_hosts

      - name: Copy binary to VM
        run: |
          scp -i ~/.ssh/id_deploy smolterms deploy@${{ secrets.GCP_VM_IP }}:/tmp/smolterms

      - name: Deploy and restart service
        run: |
          ssh -i ~/.ssh/id_deploy deploy@${{ secrets.GCP_VM_IP }} << 'EOF'
          sudo mv /tmp/smolterms /opt/smolterms/smolterms
          sudo chown smolterms:smolterms /opt/smolterms/smolterms
          sudo chmod 755 /opt/smolterms/smolterms
          sudo systemctl restart smolterms
          EOF

      - name: Health check
        run: |
          sleep 5
          for i in $(seq 1 10); do
            echo "Attempt $i/10..."
            HTTP_CODE=$(ssh -i ~/.ssh/id_deploy deploy@${{ secrets.GCP_VM_IP }} "curl -s -o /dev/null -w '%{http_code}' --max-time 5 http://localhost:8080/api/v1/health" || true)
            echo "HTTP status: $HTTP_CODE"
            if [ "$HTTP_CODE" = "200" ]; then
              echo "Health check passed"
              exit 0
            fi
            sleep 5
          done
          echo "Health check failed"
          exit 1