"""Container healthcheck. `python -m app_healthcheck` from ai-compose.yml.

Exits 0 only if the process answers /healthz. It deliberately does not check
Cube or imh - an unreachable upstream is a degraded API, not a dead container,
and flapping the container makes that harder to diagnose, not easier.
"""

import sys
import urllib.request

try:
    with urllib.request.urlopen("http://localhost:8000/healthz", timeout=4) as r:
        sys.exit(0 if r.status == 200 else 1)
except Exception:
    sys.exit(1)