app/dev.py

"""Launch the demo tier locally: FastAPI (uvicorn) + Streamlit together.

Used by `make demo` and mirrors what the Docker image does. The API owns the
embedded Qdrant; the UI (this same launcher) talks to it over HTTP.

    python app/dev.py
"""

from __future__ import annotations

import os
import subprocess
import sys
import time
from pathlib import Path

APP_DIR = Path(__file__).resolve().parent
PORT_API = os.getenv("API_PORT", "8000")
PORT_UI = os.getenv("UI_PORT", "8501")


def main() -> None:
    env = dict(os.environ, APP_API_URL=f"http://localhost:{PORT_API}")

    api = subprocess.Popen(
        [sys.executable, "-m", "uvicorn", "main:app",
         "--host", "0.0.0.0", "--port", PORT_API],
        cwd=str(APP_DIR), env=env,
    )
    time.sleep(2)  # let the API bind before the UI starts polling /health
    try:
        subprocess.run(
            [sys.executable, "-m", "streamlit", "run", "ui.py",
             "--server.port", PORT_UI, "--server.address", "0.0.0.0"],
            cwd=str(APP_DIR), env=env, check=False,
        )
    finally:
        api.terminate()


if __name__ == "__main__":
    main()