#!/bin/bash
# 15 分钟长测：确认 MTU 修复后 90%+ 能稳住。
set -u

RELAY_DIR=/root/lanremote-relay
URL=https://relay.xxmxxs.top

echo "  起点：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 $2}')"
echo "  tcp_mtu_probing=$(cat /proc/sys/net/ipv4/tcp_mtu_probing)"
echo "  MSS 规则=$(iptables -t mangle -L -n 2>/dev/null | grep -ci mss) 条"
: > "$RELAY_DIR/tunnel.log"

echo "  连续探 15 分钟（每 5 秒一次，共 180 次）…"
ok=0; bad=0; consec=0; maxconsec=0
for i in $(seq 1 180); do
    c=$(timeout 12 curl -4 -s -o /dev/null -w '%{http_code}' \
        -H 'User-Agent: LanRemote/1.4.0' "$URL/v1/health" 2>/dev/null)
    c=${c:-000}
    if [ "$c" = "200" ]; then
        ok=$((ok+1)); consec=0
    else
        bad=$((bad+1)); consec=$((consec+1))
        [ "$consec" -gt "$maxconsec" ] && maxconsec=$consec
    fi
    sleep 5
done

pct=$((ok * 100 / 180))
echo
echo "===== 结果 ====="
echo "  可用 $ok/180 = ${pct}%"
echo "  最长连续失败 ${maxconsec} 次（约 $((maxconsec * 5)) 秒）"
echo
echo "  隧道：注册 $(grep -c 'Registered tunnel connection' "$RELAY_DIR/tunnel.log" 2>/dev/null || echo 0) 次 ·" \
     "断开 $(grep -c 'Connection terminated' "$RELAY_DIR/tunnel.log" 2>/dev/null || echo 0) 次 ·" \
     "Bad request $(grep -c 'Bad request syntax' "$RELAY_DIR/tunnel.log" 2>/dev/null || echo 0) 次"
echo
echo "  看门狗动作："
tail -4 "$RELAY_DIR/watchdog.log" 2>/dev/null | sed 's/^/    /'
echo
echo "===== 对比 ====="
echo "    修之前            48% ~ 75%"
echo "    MTU 修复后        ${pct}%"
if [ "$pct" -ge 90 ]; then
    echo "    ✓ 达标"
else
    echo "    ~ 未达 90%"
fi