#!/bin/bash
# 装第二版看门狗：30 秒一轮（原来 5 分钟）。
set -u

RELAY_DIR=/root/lanremote-relay

echo "===== 1. 装脚本 ====="
chmod +x "$RELAY_DIR/watchdog.sh"
echo "  $(ls -la $RELAY_DIR/watchdog.sh | awk '{print $5" 字节"}')"

echo
echo "===== 2. 服务 ====="
cat > /etc/systemd/system/lanremote-watchdog.service <<'EOF'
[Unit]
Description=LanRemote 隧道看门狗（看连接数，不是看公网）
After=lanremote-relay.service lanremote-tunnel.service

[Service]
Type=oneshot
ExecStart=/bin/bash /root/lanremote-relay/watchdog.sh
MemoryMax=64M
StandardOutput=append:/root/lanremote-relay/watchdog.log
StandardError=append:/root/lanremote-relay/watchdog.log
EOF

echo
echo "===== 3. 定时器：30 秒一轮 ====="
cat > /etc/systemd/system/lanremote-watchdog.timer <<'EOF'
[Unit]
Description=每 30 秒检查一次隧道连接数

[Timer]
OnBootSec=2min
OnUnitActiveSec=30s
AccuracySec=5s
Unit=lanremote-watchdog.service

[Install]
WantedBy=timers.target
EOF

systemctl daemon-reload
systemctl enable lanremote-watchdog.timer >/dev/null 2>&1
systemctl restart lanremote-watchdog.timer
echo "  已启用"

echo
echo "===== 4. 立刻跑一次 ====="
: > "$RELAY_DIR/watchdog.log"
systemctl start lanremote-watchdog.service
sleep 6
tail -5 "$RELAY_DIR/watchdog.log" 2>/dev/null | sed 's/^/  /' || echo "  （没输出）"

echo
echo "===== 5. 定时器状态 ====="
systemctl list-timers lanremote-watchdog.timer --no-pager 2>/dev/null | head -3 | sed 's/^/  /'

echo
echo "===== 6. 当前连接数 ====="
echo -n "  ha_connections = "
curl -s --max-time 5 http://127.0.0.1:20241/metrics 2>/dev/null \
    | grep '^cloudflared_tunnel_ha_connections' | awk '{print $2}'
echo -n "  看门狗状态: "
cat "$RELAY_DIR/watchdog.state" 2>/dev/null | tr '\n' ' '
echo

echo
echo "===== 7. 观察 2 分钟，看它有没有乱重启 ====="
BEFORE=$(systemctl show lanremote-tunnel -p NRestarts | cut -d= -f2)
sleep 120
AFTER=$(systemctl show lanremote-tunnel -p NRestarts | cut -d= -f2)
echo "  这 2 分钟里隧道自动重启次数: $AFTER（之前 $BEFORE）"
echo "  看门狗日志尾部:"
tail -6 "$RELAY_DIR/watchdog.log" 2>/dev/null | sed 's/^/    /'
echo
echo -n "  当前连接数: "
curl -s --max-time 5 http://127.0.0.1:20241/metrics 2>/dev/null \
    | grep '^cloudflared_tunnel_ha_connections' | awk '{print $2}'