使用SuperSocket打造逾10万长连接的Socket服务

SuperSocket 是一个轻量级, 跨平台而且可扩展的 .Net/Mono Socket 服务器程序框架。你无须了解如何使用 Socket, 如何维护 Socket 连接和 Socket 如何工作，但是你却可以使用 SuperSocket 很容易的开发出一款 Socket 服务器端软件，例如游戏服务器，GPS 服务器, 工业控制服务和数据采集服务器等等。

PS:上面这句话复制官网的，好了，总之告诉大家SuperSocket已经很强大、很稳定、方便。

如果你没有Socket基础，首先要了解协议；本人两年都在做智能穿戴，接触大量硬件厂商，发现大部分是“带起止符的协议”（BeginEndMarkReceiveFilter）或者“头部格式固定并且包含内容长度的协议”（FixedHeaderReceiveFilter）

我简单介绍这两种协议。

代码上我就二选一介绍FixedHeaderReceiveFilter吧

首先新建项目，在Nuget管理器上搜索“SuperSocket”安装“SuperSocket”和“SuperSocket.Engine”

接下来你需要实现

1、 IRequestInfo（请求信息，一次数据包）

    public class MyRequestInfo : IRequestInfo
    {
        public MyRequestInfo(byte[] header, byte[] bodyBuffer)
        {
            Key = ((header[0] * 256) + header[1]).ToString();
            Data = bodyBuffer;
        }
        /// <summary>
        /// 协议号对应自定义命令Name，会触摸自定义命令
        /// </summary>
        public string Key { get; set; }
        /// <summary>
        /// 正文字节码
        /// </summary>
        public byte[] Data { get; set; }
        /// <summary>
        /// 正文文本，大部分协议都不是这么玩的
        /// </summary>
        public string Body
        {
            get
            {
                return Encoding.UTF8.GetString(Data);
            }
        }
    }

2、 FixedHeaderReceiveFilter<IRequestInfo>（数据包的解析）

    public class MyReceiveFilter : FixedHeaderReceiveFilter<MyRequestInfo>
    {
        /// +-------+---+-------------------------------+
        /// |request| l |                               |
        /// | name  | e |    request body               |
        /// |  (2)  | n |                               |
        /// |       |(2)|                               |
        /// +-------+---+-------------------------------+
        public MyReceiveFilter()
        : base(4)
        {

        }

        protected override int GetBodyLengthFromHeader(byte[] header, int offset, int length)
        {
            return (int)header[offset + 2] * 256 + (int)header[offset + 3];
        }
        
        protected override MyRequestInfo ResolveRequestInfo(ArraySegment<byte> header, byte[] bodyBuffer, int offset, int length)
        {
            var body = bodyBuffer.Skip(offset).Take(length).ToArray();
            return new MyRequestInfo(header.Array, body);
        }
    }

3、 AppSession<TAppSession, TRequestInfo>（Session会话，服务端管理客户端的连接、信息）

    public class MySession : AppSession<MySession, MyRequestInfo>
    {
        public MySession()
        {

        }protected override void OnSessionStarted()
        {

        }

        protected override void OnInit()
        {
            base.OnInit();
        }

        protected override void HandleUnknownRequest(MyRequestInfo requestInfo)
        {

        }
        
        protected override void HandleException(Exception e)
        {

        }

        protected override void OnSessionClosed(CloseReason reason)
        {
            base.OnSessionClosed(reason);
        }
    }

4、 AppServer<TAppSession, TRequestInfo>（监听服务）

    public class MyServer : AppServer<MySession, MyRequestInfo>
    {
        /// <summary>
        /// 通过配置文件安装服务从这里启动
        /// </summary>
        public MyServer()
            : base(new DefaultReceiveFilterFactory<MyReceiveFilter, MyRequestInfo>())
        {
            this.NewSessionConnected += MyServer_NewSessionConnected;
            this.SessionClosed += MyServer_SessionClosed;
        }
        /// <summary>
        /// winform启动，不使用这里的事件
        /// </summary>
        public MyServer(SessionHandler<MySession> NewSessionConnected, SessionHandler<MySession, CloseReason> SessionClosed)
            : base(new DefaultReceiveFilterFactory<MyReceiveFilter, MyRequestInfo>())
        {
            this.NewSessionConnected += NewSessionConnected;
            this.SessionClosed += SessionClosed;
        }

        protected override void OnStarted()
        {
            //启动成功
            LogHelper.WriteLog(string.Format("Socket启动成功：{0}:{1}", this.Config.Ip, this.Config.Port));
        }

        void MyServer_NewSessionConnected(MySession session)
        {
            //连接成功
        }

        void MyServer_SessionClosed(MySession session, CloseReason value)
        {

        }
    }

好了，你可以跑起来

            var config = new SuperSocket.SocketBase.Config.ServerConfig()
            {
                Name = "SSServer",
                ServerTypeName = "SServer",
                ClearIdleSession= true, //60秒执行一次清理90秒没数据传送的连接
                ClearIdleSessionInterval = 60,
                IdleSessionTimeOut = 90,
                MaxRequestLength = 2048, //最大包长度
                Ip = "Any",
                Port = 18888,
                MaxConnectionNumber = 100000,
            };
            app = new MyServer(app_NewSessionConnected, app_SessionClosed);
            LogHelper.SetOnLog(new LogHelper.LogEvent((m) =>
            {
                txtAll.Text = string.Join(" ", m, "\r\n");
                txtAll.Select(txtAll.TextLength, 0);
                txtAll.ScrollToCaret();
            }));
            app.Setup(config);
            if (!app.Start())
            {
                LogHelper.WriteLog(string.Format("Socket {0}:{1}启动失败，请检查权限或端口是否被占用！", config.Ip, config.Port));
            }