.github/workflows/keep-backend-warm.yml

name: Keep HF backend awake

on:
  schedule:
    # Every 5 minutes — prevents Hugging Face Space from sleeping between user sessions
    - cron: '*/5 * * * *'
  workflow_dispatch:

jobs:
  ping:
    runs-on: ubuntu-latest
    steps:
      - name: Ping backend health (wake + verify face engine)
        env:
          HF_TOKEN: ${{ secrets.HF_TOKEN }}
        run: |
          BASE="https://solutionchallenge-solution-challenge-backend.hf.space"
          ok=0
          for i in 1 2 3 4; do
            if curl -fsS --max-time 180 "$BASE/health/live" | grep -q '"status"'; then
              echo "Backend live on attempt $i"
              ok=1
              break
            fi
            echo "Attempt $i failed, retrying in 20s..."
            sleep 20
          done
          if [ "$ok" != "1" ]; then
            echo "::warning::Backend did not respond — checking Space runtime via HF API"
            pip install -q "huggingface_hub>=0.23.0"
            python <<'PY'
          import os, sys
          from huggingface_hub import HfApi
          token = os.environ.get("HF_TOKEN", "")
          if not token:
              print("HF_TOKEN not set — skip runtime check")
              sys.exit(0)
          api = HfApi(token=token)
          space = "SolutionChallenge/solution_challenge_backend"
          info = api.space_info(space)
          rt = info.runtime or {}
          print(f"Space stage: {getattr(rt, 'stage', rt)} hardware: {getattr(rt, 'hardware', '?')}")
          try:
              api.restart_space(space)
              print("Triggered Space restart")
          except Exception as exc:
              print(f"Restart skipped: {exc}")
          PY
            exit 0
          fi
          curl -fsS --max-time 60 "$BASE/ai/status" || true