"""Monitor helper for heartbeat daemon.

This module provides monitoring tasks for the heartbeat daemon.
The primary reachability monitoring is now event-driven (timers set/reset 
on HTB arrival in udp.py) rather than periodic polling.

This module can be extended for additional monitoring tasks.
"""

from __future__ import annotations
import asyncio
import time
from . import notify as notify_mod

DROPOVERDUE = 7 * 24 * 3600
eventlog = notify_mod.eventlog


async def cleanup_connections(hbdclass):
    """Clean up connection timers on shutdown.
    
    Cancels all active overdue timers to prevent callbacks after shutdown.
    """
    for hostname, host in list(hbdclass.Host.hosts.items()):
        for conn_type, conn in host.connections.items():
            if hasattr(conn, 'cancel_overdue_timer'):
                conn.cancel_overdue_timer()