add chatserver & client

SubProject/ChatServer/ChatClient.cs

@@ -0,0 +1,174 @@
+using System;
+using System.Net.Sockets;
+using System.Text;
+using System.Threading;
+using Newtonsoft.Json;
+
+namespace NoticeServer
+{
+    /// <summary>
+    /// 연결된 채팅 클라이언트 정보 및 통신 관리
+    /// </summary>
+    public class ChatClient
+    {
+        private TcpClient tcpClient;
+        private NetworkStream stream;
+        private Thread receiveThread;
+        private bool isConnected;
+
+        /// <summary>클라이언트 고유 ID</summary>
+        public string ClientId { get; private set; }
+
+        /// <summary>닉네임</summary>
+        public string NickName { get; set; }
+
+        /// <summary>사원번호 (Employee ID)</summary>
+        public string EmployeeId { get; set; }
+
+        /// <summary>사용자 그룹</summary>
+        public string UserGroup { get; set; }
+
+        /// <summary>IP 주소</summary>
+        public string IpAddress { get; private set; }
+
+        /// <summary>호스트명</summary>
+        public string HostName { get; set; }
+
+        /// <summary>연결 시간</summary>
+        public DateTime ConnectedTime { get; private set; }
+
+        /// <summary>마지막 활동 시간</summary>
+        public DateTime LastActivity { get; set; }
+
+        /// <summary>메시지 수신 이벤트</summary>
+        public event EventHandler<ChatMessage> MessageReceived;
+
+        /// <summary>연결 해제 이벤트</summary>
+        public event EventHandler<string> Disconnected;
+
+        public ChatClient(TcpClient client)
+        {
+            tcpClient = client;
+            stream = client.GetStream();
+            isConnected = true;
+            ClientId = Guid.NewGuid().ToString();
+            ConnectedTime = DateTime.Now;
+            LastActivity = DateTime.Now;
+
+            var endpoint = client.Client.RemoteEndPoint.ToString();
+            IpAddress = endpoint.Split(':')[0];
+
+            StartReceiving();
+        }
+
+        /// <summary>
+        /// 메시지 수신 스레드 시작
+        /// </summary>
+        private void StartReceiving()
+        {
+            receiveThread = new Thread(ReceiveLoop)
+            {
+                IsBackground = true,
+                Name = $"ChatClient-{ClientId}"
+            };
+            receiveThread.Start();
+        }
+
+        /// <summary>
+        /// 메시지 수신 루프
+        /// </summary>
+        private void ReceiveLoop()
+        {
+            byte[] buffer = new byte[4096];
+
+            try
+            {
+                while (isConnected && tcpClient.Connected)
+                {
+                    int bytesRead = stream.Read(buffer, 0, buffer.Length);
+                    if (bytesRead == 0)
+                    {
+                        // Connection closed
+                        break;
+                    }
+
+                    string jsonData = Encoding.UTF8.GetString(buffer, 0, bytesRead);
+                    var message = JsonConvert.DeserializeObject<ChatMessage>(jsonData);
+
+                    if (message != null)
+                    {
+                        LastActivity = DateTime.Now;
+
+                        // Set nickname, employeeId, userGroup from Connect message
+                        if (message.Type == MessageType.Connect && !string.IsNullOrEmpty(message.NickName))
+                        {
+                            NickName = message.NickName;
+                            EmployeeId = message.EmployeeId;
+                            UserGroup = message.UserGroup;
+                            HostName = message.HostName;
+                        }
+
+                        MessageReceived?.Invoke(this, message);
+                    }
+                }
+            }
+            catch (Exception ex)
+            {
+                Console.WriteLine($"[ERROR] Client {NickName ?? ClientId} receive error: {ex.Message}");
+            }
+            finally
+            {
+                Disconnect();
+            }
+        }
+
+        /// <summary>
+        /// Send message
+        /// </summary>
+        public bool SendMessage(ChatMessage message)
+        {
+            if (!isConnected || !tcpClient.Connected)
+                return false;
+
+            try
+            {
+                string jsonData = JsonConvert.SerializeObject(message);
+                byte[] data = Encoding.UTF8.GetBytes(jsonData);
+                stream.Write(data, 0, data.Length);
+                stream.Flush();
+                return true;
+            }
+            catch (Exception ex)
+            {
+                Console.WriteLine($"[ERROR] Client {NickName ?? ClientId} send error: {ex.Message}");
+                Disconnect();
+                return false;
+            }
+        }
+
+        /// <summary>
+        /// 연결 해제
+        /// </summary>
+        public void Disconnect()
+        {
+            if (!isConnected)
+                return;
+
+            isConnected = false;
+
+            try
+            {
+                stream?.Close();
+                tcpClient?.Close();
+            }
+            catch { }
+
+            Disconnected?.Invoke(this, ClientId);
+        }
+
+        public override string ToString()
+        {
+            return $"{NickName ?? "Unknown"} ({IpAddress})";
+        }
+    }
+}