#!/bin/bash
# 为什么只建了 1 条隧道连接？（配置是 ha-connections 2）
#
# 观察：
#   100% 那次：连接数 2
#    85% 那次：连接数 1
#   -> 连接数直接决定可用率！缺一条就少一份冗余。
set -u

RELAY_DIR=/root/lanremote-relay

echo "===== 1. 现在的连接数 ====="
echo "  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
echo "===== 2. 等 90 秒，看第二条会不会自己补上 ====="
for i in 1 2 3 4 5 6; do
    sleep 15
    n=$(curl -s --max-time 5 http://127.0.0.1:20241/metrics 2>/dev/null | grep '^cloudflared_tunnel_ha_connections' | awk '{print $2}')
    echo "  ${i}5s: 连接数 = ${n:-?}"
done

echo
echo "===== 3. 隧道日志里的注册/断开 ====="
grep -E 'Registered tunnel connection|Connection terminated|Failed to dial|Lost connection' \
    "$RELAY_DIR/tunnel.log" 2>/dev/null | tail -12 | sed 's/^/  /'

echo
echo "===== 4. 配置文件里的 ha-connections ====="
grep -n 'ha-connections' /etc/systemd/system/lanremote-tunnel.service \
    | sed 's/^/  /'

echo
echo "===== 5. 用 4 条连接试试（MSS 修好之后 TCP 多连接应该更从容）====="
cat > /etc/systemd/system/lanremote-tunnel.service <<'EOF'
[Unit]
Description=LanRemote Cloudflare 具名隧道
After=network-online.target lanremote-relay.service lanremote-nettune.service
Wants=network-online.target lanremote-relay.service

[Service]
Type=simple
# 协议 HTTP/2：这条线路丢 UDP 包，QUIC 撑不住（实测 48% vs 80%）
# 连接数 4：MSS 夹好之后 TCP 多连接不再互相挤，
#           缺一条还有三条顶着（实测连接数 1 时掉到 85%）
ExecStart=/usr/local/bin/cloudflared tunnel --no-autoupdate --protocol http2 --edge-ip-version 4 --ha-connections 4 --retries 5 --config /root/.cloudflared/config.yml run lanremote
Restart=always
RestartSec=5
MemoryMax=200M
StandardOutput=append:/root/lanremote-relay/tunnel.log
StandardError=append:/root/lanremote-relay/tunnel.log

[Install]
WantedBy=multi-user.target
EOF
systemctl daemon-reload
systemctl restart lanremote-tunnel
echo "  已切到 4 条，等 60 秒…"
sleep 60
echo "  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 "  注册 $(grep -c 'Registered tunnel connection' "$RELAY_DIR/tunnel.log" 2>/dev/null || echo 0) 次"

echo
echo "===== 6. 30 次可用率 ====="
ok=0
for i in $(seq 1 30); do
    c=$(timeout 12 curl -4 -s -o /dev/null -w '%{http_code}' \
        -H 'User-Agent: LanRemote/1.4.0' https://relay.xxmxxs.top/v1/health 2>/dev/null)
    [ "$c" = "200" ] && ok=$((ok+1))
    sleep 1
done
echo "  $ok/30 = $((ok * 100 / 30))%"