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GameServer/Contents/GameMode/Helper/PingLatencyKicker.cs

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+namespace GameServer.Contents.GameMode.Helper;
+
+using Nettention.Proud;
+
+public class PingLatencyPolicy
+{
+	public int PingKickThreshold { get; set; } = 600;
+	public TimeSpan PingKickDuration { get; set; } = TimeSpan.FromSeconds(30);
+}
+
+//=====================================================================
+// LatencyChecker - 플레이가 불가능한 핑 지연을 체크한다. super peer와의 핑을 체크
+//=====================================================================
+public class PingLatencyKicker
+{
+	public class ClientLatency
+	{
+		public HostID HostId { get; set; }
+		public int PingSum { get; set; }
+		public int PingCheckCount { get; set; }
+		public DateTime PingCheckBeginTime { get; set; } = DateTime.UtcNow;
+		public int PingAverage => PingCheckCount > 0 ? PingSum / PingCheckCount: 0;
+	}
+
+	private readonly PingLatencyPolicy m_ping_latency_policy;
+	private readonly SortedList<HostID, ClientLatency> m_host_latencies = new();
+	private HostID m_group_id;
+	private HostID m_super_peer_id;
+	private readonly NetServer m_server;
+
+	public PingLatencyKicker(NetServer server, PingLatencyPolicy pingLatencyPolicy)
+	{
+		m_ping_latency_policy = pingLatencyPolicy;
+		m_server = server;
+	}
+
+	public void setGroupHostId(HostID groupId)
+	{
+		m_group_id = groupId;
+	}
+
+	public void setSuperPeerId(HostID superPeerId)
+	{
+		m_super_peer_id = superPeerId;
+	}
+
+	//=================================================================
+	// 호스트 그룹에 속한 클라이언트의 핑 지연을 체크하여, 게임이 불가한 지연이 발생한 경우 해당 호스트를 반환
+	//==============================================================
+	public IEnumerable<HostID> shouldKick()
+	{
+		if (!isValidGroup())
+		{
+			return [];
+		}
+
+		checkAndValidateSuperPeer();
+
+		if (!isValidSuperPeer())
+		{
+			return [];
+		}
+
+		var kick_host_ids = getGroupMemberHostIds().Where(x => checkLatency(x) == true);
+		return kick_host_ids;
+	}
+
+	public async Task<IEnumerable<HostID>> shouldKickAsync()
+	{
+		return await Task.Run(shouldKick);
+	}
+
+	//=================================================================
+	// 핑 지연 체크
+	//=================================================================
+	private bool checkLatency(HostID hostId)
+	{
+		var ping_to_super_peer = getP2PRecentPingMs(hostId);
+		m_host_latencies.TryGetValue(hostId, out var client_latency);
+		if (ping_to_super_peer > m_ping_latency_policy.PingKickThreshold)
+		{
+			if (client_latency == null)
+			{
+				client_latency = new ClientLatency
+				{
+					HostId = hostId, PingSum = 0, PingCheckCount = 0, PingCheckBeginTime = DateTime.UtcNow
+				};
+				m_host_latencies.Add(hostId, client_latency);
+			}
+		}
+
+		if (client_latency != null)
+		{
+			if (client_latency.PingCheckBeginTime + m_ping_latency_policy.PingKickDuration > DateTime.UtcNow)
+			{
+				if (client_latency.PingAverage > m_ping_latency_policy.PingKickThreshold)
+				{
+					return true;
+				}
+
+				m_host_latencies.Remove(hostId);
+			}
+		}
+
+		return false;
+	}
+
+	private int getP2PRecentPingMs(HostID hostId)
+	{
+		return m_server.GetP2PRecentPingMs(hostId, m_super_peer_id);
+	}
+
+	private IEnumerable<HostID> getGroupMemberHostIds()
+	{
+		var host_ids = new List<HostID>();
+		var group_info = m_server.GetP2PGroupInfo(m_group_id);
+		for (int i = 0; i < group_info.members.GetCount(); i++)
+		{
+			host_ids.Add(group_info.members.At(i));
+		}
+
+		return host_ids;
+	}
+
+	//=================================================================
+	// 호스트 그룹이 삭제됐는 지 확인
+	//=================================================================
+	private bool isValidGroup()
+	{
+		if (m_group_id == HostID.HostID_None)
+			return false;
+
+		var group_info = m_server.GetP2PGroupInfo(m_group_id);
+		if (group_info == null || group_info.members.GetCount() == 0)
+		{
+			m_group_id = HostID.HostID_None;
+			return false;
+		}
+
+		return true;
+	}
+
+	//=================================================================
+	// 수퍼 피어가 퇴장한 경우 등을 체크
+	//=================================================================
+	private void checkAndValidateSuperPeer()
+	{
+		// 수퍼 피어가 퇴장한 경우 등을 체크
+		if (m_super_peer_id != HostID.HostID_None && m_server.GetClientInfo(m_super_peer_id) == null)
+		{
+			m_super_peer_id = HostID.HostID_None;
+		}
+	}
+
+	//=================================================================
+	// 수퍼 피어가 설정되어 있는지 체크
+	//=================================================================
+	private bool isValidSuperPeer()
+	{
+		return m_super_peer_id != HostID.HostID_None;
+	}
+}