a301_mmo_game_server/MMOTestServer/ServerLib/Service/Session.cs

using LiteNetLib;

namespace ServerLib.Service;

public class Session
{
    public string? Token
    {
        get;
        set;
    }

    public string? Username
    {
        get;
        set;
    }

    public int HashKey
    {
        get;
        init;
    }

    public NetPeer Peer
    {
        get;
        set;
    }

    // ─── 패킷 레이트 리미팅 ───────────────────────────
    private int packetCount;
    private long windowStartTicks;

    /// <summary>초당 허용 패킷 수</summary>
    public int MaxPacketsPerSecond { get; set; }

    /// <summary>연속 초과 횟수</summary>
    public int RateLimitViolations { get; private set; }

    /// <summary>
    /// 패킷 수신 시 호출. 초당 제한 초과 시 true 반환.
    /// </summary>
    public bool CheckRateLimit()
    {
        long now = Environment.TickCount64;

        // 1초(1000ms) 윈도우 초과 시 리셋
        if (now - windowStartTicks >= 1000)
        {
            windowStartTicks = now;
            packetCount = 0;
        }

        packetCount++;

        if (packetCount > MaxPacketsPerSecond)
        {
            RateLimitViolations++;
            return true; // 제한 초과
        }

        return false;
    }

    /// <summary>위반 카운트 초기화</summary>
    public void ResetViolations()
    {
        RateLimitViolations = 0;
    }

    public Session(int hashKey, NetPeer peer, int maxPacketsPerSecond = 60)
    {
        HashKey = hashKey;
        Peer = peer;
        Token = null;
        MaxPacketsPerSecond = maxPacketsPerSecond;
        packetCount = 0;
        windowStartTicks = Environment.TickCount64;
        RateLimitViolations = 0;
    }
}