147 lines
5.9 KiB
C#
147 lines
5.9 KiB
C#
using System;
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using System.Collections.Generic;
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using System.Linq;
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using System.Net.WebSockets;
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using System.Text;
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using System.Threading;
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using System.Threading.Tasks;
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using System.Web;
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using System.Web.WebSockets;
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namespace WebSocketTest
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{
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/// <summary>
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/// 离线消息
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/// </summary>
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public class MessageInfo
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{
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public MessageInfo(DateTime _MsgTime, ArraySegment<byte> _MsgContent)
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{
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MsgTime = _MsgTime;
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MsgContent = _MsgContent;
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}
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public DateTime MsgTime { get; set; }
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public ArraySegment<byte> MsgContent { get; set; }
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}
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/// <summary>
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/// Handler 的摘要说明
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/// </summary>
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public class Handler : IHttpHandler
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{
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private static Dictionary<string, WebSocket> CONNECT_POOL = new Dictionary<string, WebSocket>();//用户连接池
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private static Dictionary<string, List<MessageInfo>> MESSAGE_POOL = new Dictionary<string, List<MessageInfo>>();//离线消息池
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public void ProcessRequest(HttpContext context)
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{
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//context.Response.ContentType = "text/plain";
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//context.Response.Write("Hello World");
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if (context.IsWebSocketRequest)
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{
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context.AcceptWebSocketRequest(ProcessChat);
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}
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}
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private async Task ProcessChat(AspNetWebSocketContext context)
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{
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WebSocket socket = context.WebSocket;
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string user = context.QueryString["user"].ToString();
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try
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{
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#region 用户添加连接池
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//第一次open时，添加到连接池中
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if (!CONNECT_POOL.ContainsKey(user))
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CONNECT_POOL.Add(user, socket);//不存在，添加
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else
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if (socket != CONNECT_POOL[user])//当前对象不一致，更新
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CONNECT_POOL[user] = socket;
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#endregion
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#region 离线消息处理
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if (MESSAGE_POOL.ContainsKey(user))
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{
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List<MessageInfo> msgs = MESSAGE_POOL[user];
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foreach (MessageInfo item in msgs)
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{
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await socket.SendAsync(item.MsgContent, WebSocketMessageType.Text, true, CancellationToken.None);
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}
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MESSAGE_POOL.Remove(user);//移除离线消息
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}
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#endregion
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string descUser = string.Empty;//目的用户
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while (true)
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{
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if (socket.State == WebSocketState.Open)
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{
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ArraySegment<byte> buffer = new ArraySegment<byte>(new byte[2048]);
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WebSocketReceiveResult result = await socket.ReceiveAsync(buffer, CancellationToken.None);
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#region 消息处理（字符截取、消息转发）
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try
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{
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#region 关闭Socket处理，删除连接池
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if (socket.State != WebSocketState.Open)//连接关闭
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{
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if (CONNECT_POOL.ContainsKey(user)) CONNECT_POOL.Remove(user);//删除连接池
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break;
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}
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#endregion
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string userMsg = Encoding.UTF8.GetString(buffer.Array, 0, result.Count);//发送过来的消息
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string[] msgList = userMsg.Split('|');
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if (msgList.Length == 2)
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{
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if (msgList[0].Trim().Length > 0)
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descUser = msgList[0].Trim();//记录消息目的用户
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buffer = new ArraySegment<byte>(Encoding.UTF8.GetBytes(msgList[1]));
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}
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else
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buffer = new ArraySegment<byte>(Encoding.UTF8.GetBytes(userMsg));
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buffer = new ArraySegment<byte>(Encoding.UTF8.GetBytes("在线用户：" + CONNECT_POOL.Count.ToString()));
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if (CONNECT_POOL.ContainsKey(descUser))//判断客户端是否在线
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{
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WebSocket destSocket = CONNECT_POOL[descUser];//目的客户端
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if (destSocket != null && destSocket.State == WebSocketState.Open)
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await destSocket.SendAsync(buffer, WebSocketMessageType.Text, true, CancellationToken.None);
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}
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else
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{
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Task.Run(() =>
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{
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if (!MESSAGE_POOL.ContainsKey(descUser))//将用户添加至离线消息池中
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MESSAGE_POOL.Add(descUser, new List<MessageInfo>());
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MESSAGE_POOL[descUser].Add(new MessageInfo(DateTime.Now, buffer));//添加离线消息
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});
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}
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}
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catch (Exception ex)
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{
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//消息转发异常处理，本次消息忽略 继续监听接下来的消息
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}
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#endregion
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}
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else
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{
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break;
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}
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}//while end
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}
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catch (Exception ex)
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{
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//整体异常处理
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if (CONNECT_POOL.ContainsKey(user)) CONNECT_POOL.Remove(user);
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}
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}
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public bool IsReusable
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{
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get
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{
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return false;
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}
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}
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}
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} |