#!/usr/bin/env python3
"""模拟页面 pollStatus：5s 超时算失败，连续失败即离线。"""
import time
import urllib.request
import urllib.error

URL = "http://192.168.31.127/system/status"
TIMEOUT = 5.0
POLL = 1.0
WINDOW = 75


def probe():
    t0 = time.time()
    try:
        with urllib.request.urlopen(URL, timeout=TIMEOUT) as r:
            r.read(64)
            return True, "HTTP %s" % r.status, time.time() - t0
    except urllib.error.HTTPError as e:
        return False, "HTTP %s" % e.code, time.time() - t0
    except Exception as e:
        return False, "%s: %s" % (type(e).__name__, str(e)[:80]), time.time() - t0


def main():
    print("=== monitor start (mimic pollStatus) ===", flush=True)
    prev = None
    fails = 0
    t_end = time.time() + WINDOW
    while time.time() < t_end:
        ok, msg, dt = probe()
        now = time.strftime("%H:%M:%S")
        if ok:
            fails = 0
            state = "ONLINE"
        else:
            fails += 1
            state = "FAIL#%d" % fails + (" -> OFFLINE" if fails >= 1 else "")
        mark = " *" if state != prev else ""
        print("[%s] %s  (%s, %.0fms)%s" % (now, state, msg, dt * 1000, mark), flush=True)
        if state != prev:
            prev = state
        time.sleep(POLL)
    print("=== monitor end ===", flush=True)


if __name__ == "__main__":
    main()