Track Internet Connectivity and Downtime Automatically in Python

import time
import subprocess
from datetime import datetime

def check_internet(host="8.8.8.8", timeout=3):
    """Returns True if internet is reachable via ping."""
    try:
        subprocess.run(
            ["ping", "-c", "1", "-W", str(timeout), host],
            capture_output=True,
            timeout=timeout + 2
        )
        return True
    except (subprocess.TimeoutExpired, subprocess.CalledProcessError, FileNotFoundError):
        return False

def track_connectivity(interval=5, max_downtime_logs=10):
    """Monitors internet connectivity and logs downtime."""
    downtime_start = None
    downtime_events = []

    print(f"Tracking internet connectivity every {interval} seconds...")
    print("Press Ctrl+C to stop.\n")

    try:
        while len(downtime_events) < max_downtime_logs:
            if check_internet():
                if downtime_start:
                    duration = time.time() - downtime_start
                    downtime_events.append((downtime_start, duration))
                    dt = datetime.fromtimestamp(downtime_start).isoformat()
                    print(f"Recovered at {datetime.now().isoformat()} after {duration:.1f}s downtime (started {dt})")
                    downtime_start = None
            else:
                if not downtime_start:
                    downtime_start = time.time()
                    print(f"Lost internet at {datetime.now().isoformat()}")
            time.sleep(interval)
    except KeyboardInterrupt:
        print("\nTracking stopped by user.")

    if downtime_events:
        print("\nDowntime Summary:")
        for start, duration in downtime_events:
            dt = datetime.fromtimestamp(start).isoformat()
            print(f"  Started: {dt}, Duration: {duration:.1f}s")
    else:
        print("\nNo downtime detected during tracking period.")

if __name__ == "__main__":
    track_connectivity(interval=2, max_downtime_logs=3)