#!/bin/bash
# 长轮询为什么跑着跑着就全挂？
#
# 实测：60 次长轮询，前 18 次成功，之后全失败（502）。
#       每次耗时 15.6 秒（长轮询 hold 15 秒）。
#
# 查：隧道是不是在这期间死了 / 连接数掉了 / 看门狗干了什么。
set -u

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

echo "===== 1. 服务 ====="
for s in lanremote-relay lanremote-tunnel lanremote-watchdog.timer; do
    printf "  %-26s %s\n" "$s" "$(systemctl is-active "$s" 2>/dev/null)"
done

echo
echo "===== 2. 隧道连接数 / 注册 / 断开 ====="
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 "  注册 $(grep -c 'Registered tunnel connection' "$RELAY_DIR/tunnel.log" 2>/dev/null || echo 0) 次"
echo "  断开 $(grep -c 'Connection terminated' "$RELAY_DIR/tunnel.log" 2>/dev/null || echo 0) 次"
echo "  Lost $(grep -c 'Lost connection with the edge' "$RELAY_DIR/tunnel.log" 2>/dev/null || echo 0) 次"
echo "  502  $(grep -ci '502\|bad gateway' "$RELAY_DIR/tunnel.log" 2>/dev/null || echo 0) 次"

echo
echo "===== 3. 隧道日志最近 15 行 ====="
tail -15 "$RELAY_DIR/tunnel.log" 2>/dev/null | sed 's/^/  /'

echo
echo "===== 4. 看门狗最近 8 条 ====="
tail -8 "$RELAY_DIR/watchdog.log" 2>/dev/null | sed 's/^/  /'

echo
echo "===== 5. relay 收到的请求数 / 内存 ====="
curl -s --max-time 8 http://127.0.0.1:8080/v1/health 2>/dev/null \
    | python3 -c 'import json,sys; d=json.load(sys.stdin); print(f"  totalRequests={d[\"totalRequests\"]} memory={d[\"memoryKB\"]//1024}MB uptime={d[\"uptimeSeconds\"]}s")' \
    2>/dev/null || echo "  读不到"

echo
echo "===== 6. relay 的线程数（长轮询会不会堆线程）====="
PID=$(systemctl show lanremote-relay -p MainPID --value 2>/dev/null)
if [ -n "$PID" ] && [ "$PID" != "0" ]; then
    echo "  PID=$PID 线程数=$(ls /proc/$PID/task 2>/dev/null | wc -l)"
    echo "  打开的文件数=$(ls /proc/$PID/fd 2>/dev/null | wc -l)"
else
    echo "  拿不到 PID"
fi

echo
echo "===== 7. 现在公网（10 次）====="
ok=0
for i in $(seq 1 10); do
    c=$(timeout 15 curl -4 -s -o /dev/null -w '%{http_code}' \
        -H 'User-Agent: LanRemote/1.4.0' "$URL/v1/health" 2>/dev/null)
    printf "%s " "${c:-000}"
    [ "$c" = "200" ] && ok=$((ok+1))
    sleep 1
done
echo
echo "  公网 $ok/10"