docker-compose.yml

services:
  keeper:
    build:
      context: ./keeper
      dockerfile: Dockerfile
    # Load all environment variables from keeper/.env
    # Copy keeper/.env.example → keeper/.env and fill in your values before running.
    env_file:
      - ./keeper/.env
    volumes:
      # Persist the task registry (data/tasks.json) across container restarts.
      - ./keeper/data:/app/data
    ports:
      # Expose the health / metrics HTTP server.
      - "3001:3000"
    restart: unless-stopped
    healthcheck:
      # Uses wget (available in Alpine) to probe the /health endpoint.
      # wget exits non-zero on HTTP errors, which satisfies Docker's check.
      test: ["CMD-SHELL", "wget -qO- http://localhost:3000/health || exit 1"]
      interval: 30s
      timeout: 10s
      retries: 3
      start_period: 15s

  # ── Health-check sidecar ────────────────────────────────────────────────────
  # Polls the keeper's /health endpoint and sends SIGTERM to PID 1 of the
  # keeper container after FAILURE_THRESHOLD consecutive failures, causing
  # Docker to restart it (per the keeper's restart: unless-stopped policy).
  keeper-sidecar:
    image: curlimages/curl:8.7.1   # tiny image (~12 MB) with curl pre-installed
    depends_on:
      - keeper
    volumes:
      - ./keeper/health-check-sidecar.sh:/sidecar/health-check-sidecar.sh:ro
    environment:
      HEALTH_URL: "http://keeper:3000/health"
      POLL_INTERVAL_S: "${SIDECAR_POLL_INTERVAL_S:-15}"
      FAILURE_THRESHOLD: "${SIDECAR_FAILURE_THRESHOLD:-3}"
      # Signal the keeper container's entrypoint process via the shared network.
      # In a real deployment replace with: supervisorctl restart keeper
      RESTART_CMD: "wget -qO- --post-data='' http://keeper:3000/health || true"
    entrypoint: ["sh", "/sidecar/health-check-sidecar.sh"]
    restart: unless-stopped

  indexer:
    build:
      context: ./indexer
      dockerfile: Dockerfile
    ports:
      - "4000:4000"
    volumes:
      - ./indexer/indexer.db:/app/indexer.db
    restart: unless-stopped