#!/bin/bash
# QUIC 握手细节：跑一个**临时的** debug 实例（60 秒），不动生产实例。
#
# 目的：拿到 "timeout: no recent network activity" 背后的握手细节 ——
#   是 Initial 包发出去没回应？还是 TLS 阶段断的？还是 MTU 卡在某个大小？
#
# 注意：这个临时实例会往同一个具名隧道多注册 1 条连接，
#       60 秒后自己退出。对生产只有极轻微影响。
set -u

LOG=/tmp/quic_debug.log
rm -f "$LOG"

echo "════════ 1. 跑 60 秒 debug 实例 ════════"
echo "  参数: --protocol quic --ha-connections 1 --loglevel debug"
echo "  metrics 用 20299（避开生产的 20241/20242）"
echo

timeout 60 /usr/local/bin/cloudflared tunnel \
    --protocol quic \
    --edge-ip-version 4 \
    --ha-connections 1 \
    --no-autoupdate \
    --loglevel debug \
    --metrics 127.0.0.1:20299 \
    --config /root/.cloudflared/config.yml \
    run lanremote > "$LOG" 2>&1 || true

echo "  日志行数: $(wc -l < "$LOG")"

echo
echo "════════ 2. 握手相关的事件 ════════"
grep -iE 'initial|handshake|dial|registration|curve|version|mtu|congestion|tls' "$LOG" \
    | head -40 | sed 's/^/  /'

echo
echo "════════ 3. QUIC 特有的细节 ════════"
grep -iE 'quic|udp' "$LOG" | head -25 | sed 's/^/  /'

echo
echo "════════ 4. 失败/警告 ════════"
grep -iE 'ERR|WRN|failed|timeout|refused|unreachable' "$LOG" | head -25 | sed 's/^/  /'

echo
echo "════════ 5. 成功注册了吗 ════════"
grep -c 'Registered tunnel connection' "$LOG" | sed 's/^/  成功注册次数: /'
grep 'Registered tunnel connection' "$LOG" | tail -3 | sed 's/^/  /'

echo
echo "════════ 6. 用了多久完成握手 ════════"
# 找第一条和注册成功的时间戳
first=$(head -1 "$LOG" | grep -oE '^[0-9T:.Z-]+' || echo "?")
last=$(grep 'Registered tunnel connection' "$LOG" | head -1 | grep -oE '^[0-9T:.Z-]+' || echo "?")
echo "  首行时间: $first"
echo "  注册成功: $last"

echo
echo "════════ 7. debug 级别的包级细节（前 30 行原始日志）════════"
head -30 "$LOG" | sed 's/^/  /'

echo
echo "════════ 8. 确认生产实例没受影响 ════════"
for port in 20241 20242; do
    n=$(curl -s --max-time 4 "http://127.0.0.1:$port/metrics" 2>/dev/null \
        | grep '^cloudflared_tunnel_ha_connections' | awk '{print $2}')
    echo "  端口 $port: ${n:-无响应}"
done
echo "  20299（临时实例，应该已退出）: $(ss -tlnp 2>/dev/null | grep -c 20299)"
echo "  长测进度: 健康 $(wc -l < /root/long2h_health.tsv) 条, 轮询 $(wc -l < /root/rp_poll30.tsv) / 30"