linux可用的跨平台C# .net standard2.0 写的高性能socket框架

能在window(IOCP)/linux(epoll)运行，基于C# .net standard2.0 写的socket框架，可使用于.net Framework/dotnet core程序集，.使用异步连接，异步发送，异步接收，性能爆表，并且通过压力测试。

源码下载地址：

https://download.csdn.net/download/guosa542129/11980602

通过并发测试，多线程测试程序地址：

https://download.csdn.net/download/guosa542129/11980605

操作过程：

安装NuGet: https://www.nuget.org/packages/socket.core/
Package Manager: Install-Package socket.core
.Net CLI :dotnet add package socket.core
Paket CLI:paket add socket.core

一：TCP模块介绍

服务端所在socket.core.Server命名空间下，分别为三种模式 push/pull/pack
客户端所在socket.core.Client命名空间下，分别为三种模式 push/pull/pack

主要流程与对应的方法和事件介绍.
注:connectId(int)代表着一个连接对象,data(byte[]),success(bool)

• 1.初始化TCP实现类(对应的三种模式)

  实例化服务端类 TcpPushServer/TcpPullServer/TcpPackServer
  实例化客户端类 TcpPushClient/TcpPullClient/TcpPackClient
  参数介绍int numConnections同时处理的最大连接数,int receiveBufferSize用于每个套接字I/O操作的缓冲区大小(接收端), int overtime超时时长,单位秒.(每10秒检查一次)，当值为0时，不设置超时,uint headerFlag包头标记范围0~1023(0x3FF),当包头标识等于0时，不校验包头

• 2.启动监听/连接服务器

  服务端 server.Start(port);
  客户端 client.Connect(ip,port);

• 3.触发连接事件

  服务端 server.OnAccept(connectId); 接收到一个连接id,可用他来发送，接收，关闭的标记
  客户端 client.OnConnect(success); 接收是否成功连接到服务器

• 4.发送消息

  服务端 server.Send(connectId,data,offset,length);
  客户端 client.Send(data,offset,length);

• 5.触发已发送事件

  服务端 server.OnSend(connectId,length);
  客户端 client.OnSend(length);

• 6.触发接收事件

  服务端 server.OnReceive(connectId, data);
  客户端 client.OnReceive(data);

• 7.关闭连接

  服务端 server.Close(connectId);
  客户端 client.Close();

• 8.触发关闭连接事件

  服务端 server.OnClose(connectId);
  客户端 client.OnClose();

三种模型简介

• 一:push

  当接收到数据时会触发监听事件OnReceive(connectId,data);把数据立马“推”给应用程序

• 二:pull

  当接收到数据时会触发监听事件OnReceive(connectId,length)，告诉应用程序当前已经接收到了多少数据长度，应用程序可使用GetLength(connectId)方法检查已接收的数据的长度，如果满足则调用组件的Fetch(connectId,length)方法，把需要的数据“拉”出来

• 三:pack

  pack模型组件是push和pull模型的结合体，应用程序不必要处理分包/合包，组件保证每个server.OnReceive(connectId,data)/client.OnReceive(data)事件都向应用程序提供一个完整的数据包
  注：pack模型组件会对应用程序发送的每个数据包自动加上4个字节(32bit)的包头，组件接收到数据时，根据包头信息自动分包，每个完整的数据包通过OnReceive(connectId, data)事件发送给应用程序
  PACK包头格式(4字节)4*8=32
  XXXXXXXXXXYYYYYYYYYYYYYYYYYYYYYY
  前10位X为包头标识位，用于数据包校验，有效包头标识取值范围0~1023(0x3FF),当包头标识等于0时，不校验包头，后22位Y为长度位，记录包体长度。有效数据包最大长度不能超过4194303（0x3FFFFF）字节(byte),应用程序可以通过TcpPackServer/TcpPackClient构造函数参数headerFlag设置

服务端其它方法介绍

• 1. bool SetAttached(int connectId, object data)

  服务端为每个客户端设置附加数据，避免用户自己再建立用户映射表

• 2. T GetAttached(int connectId)

  获取指定客户端的附加数据

• 3. 属性:ConcurrentDictionary<int, string> ClientList

  获取正在连接的客户端信息<connectId,ip和端口>

二：核心源码

• using System;
  using System.Collections.Generic;
  using System.Net;
  using System.Net.Sockets;
  using System.Text;
  using System.Threading;
  using System.Linq;
  using System.Collections.Concurrent;
  using socket.core.Common;
  
  namespace socket.core.Server
  {
      /// <summary>
      /// tcp Socket监听基库
      /// </summary>
      internal class TcpServer
      {
          /// <summary>
          /// 连接标示 自增长
          /// </summary>
          private int connectId;
          /// <summary>
          /// 同时处理的最大连接数
          /// </summary>
          private int m_numConnections;
          /// <summary>
          /// 用于每个套接字I/O操作的缓冲区大小
          /// </summary>
          private int m_receiveBufferSize;
          /// <summary>
          /// 所有套接字接收操作的一个可重用的大型缓冲区集合。
          /// </summary>
          private BufferManager m_bufferManager;
          /// <summary>
          /// 用于监听传入连接请求的套接字
          /// </summary>
          private Socket listenSocket;
          /// <summary>
          /// 接受端SocketAsyncEventArgs对象重用池，接受套接字操作
          /// </summary>
          private SocketAsyncEventArgsPool m_receivePool;
          /// <summary>
          /// 发送端SocketAsyncEventArgs对象重用池，发送套接字操作
          /// </summary>
          private SocketAsyncEventArgsPool m_sendPool;
          /// <summary>
          /// 超时，如果超时，服务端断开连接，客户端需要重连操作
          /// </summary>
          private int overtime;
          /// <summary>
          /// 超时检查间隔时间(秒)
          /// </summary>
          private int overtimecheck = 1;
          /// <summary>
          /// 能接到最多客户端个数的原子操作
          /// </summary>
          private Semaphore m_maxNumberAcceptedClients;
          /// <summary>
          /// 已经连接的对象池
          /// </summary>
          internal ConcurrentDictionary<int, ConnectClient> connectClient;
          /// <summary>
          /// 发送线程数
          /// </summary>
          private int sendthread = 10;
          /// <summary>
          /// 需要发送的数据
          /// </summary>
          private ConcurrentQueue<SendingQueue>[] sendQueues;      
          /// <summary>
          /// 锁
          /// </summary>
          private Mutex mutex = new Mutex();
          /// <summary>
          /// 连接成功事件
          /// </summary>
          internal event Action<int> OnAccept;
          /// <summary>
          /// 接收通知事件
          /// </summary>
          internal event Action<int, byte[], int, int> OnReceive;
          /// <summary>
          /// 已送通知事件
          /// </summary>
          internal event Action<int, int> OnSend;
          /// <summary>
          /// 断开连接通知事件
          /// </summary>
          internal event Action<int> OnClose;
  
          /// <summary>
          /// 设置基本配置
          /// </summary>   
          /// <param name="numConnections">同时处理的最大连接数</param>
          /// <param name="receiveBufferSize">用于每个套接字I/O操作的缓冲区大小(接收端)</param>
          /// <param name="overTime">超时时长,单位秒.(每10秒检查一次)，当值为0时，不设置超时</param>
          internal TcpServer(int numConnections, int receiveBufferSize, int overTime)
          {
              overtime = overTime;
              m_numConnections = numConnections;
              m_receiveBufferSize = receiveBufferSize;
              m_bufferManager = new BufferManager(receiveBufferSize * m_numConnections, receiveBufferSize);
              m_receivePool = new SocketAsyncEventArgsPool(m_numConnections);
              m_sendPool = new SocketAsyncEventArgsPool(m_numConnections);
              m_maxNumberAcceptedClients = new Semaphore(m_numConnections, m_numConnections);
              Init();
          }
  
          /// <summary>
          /// 初始化服务器通过预先分配的可重复使用的缓冲区和上下文对象。这些对象不需要预先分配或重用，但这样做是为了说明API如何可以易于用于创建可重用对象以提高服务器性能。
          /// </summary>
          private void Init()
          {
              connectClient = new ConcurrentDictionary<int, ConnectClient>();
              sendQueues = new ConcurrentQueue<SendingQueue>[sendthread];
              for (int i = 0; i < sendthread; i++)
              {
                  sendQueues[i] = new ConcurrentQueue<SendingQueue>();
              }
              //分配一个大字节缓冲区，所有I/O操作都使用一个。这个侍卫对内存碎片
              m_bufferManager.InitBuffer();
              //预分配的接受对象池socketasynceventargs，并分配缓存
              SocketAsyncEventArgs saea_receive;
              //分配的发送对象池socketasynceventargs，但是不分配缓存
              SocketAsyncEventArgs saea_send;
              for (int i = 0; i < m_numConnections; i++)
              {
                  //预先接受端分配一组可重用的消息
                  saea_receive = new SocketAsyncEventArgs();
                  saea_receive.Completed += new EventHandler<SocketAsyncEventArgs>(IO_Completed);
                  //分配缓冲池中的字节缓冲区的socketasynceventarg对象
                  m_bufferManager.SetBuffer(saea_receive);
                  m_receivePool.Push(saea_receive);
                  //预先发送端分配一组可重用的消息
                  saea_send = new SocketAsyncEventArgs();
                  saea_send.Completed += new EventHandler<SocketAsyncEventArgs>(IO_Completed);
                  m_sendPool.Push(saea_send);
              }
          }
  
          /// <summary>
          /// 启动tcp服务侦听
          /// </summary>       
          /// <param name="port">监听端口</param>
          internal void Start(int port)
          {
              IPEndPoint localEndPoint = new IPEndPoint(IPAddress.Any, port);
              //创建listens是传入的套接字。
              listenSocket = new Socket(localEndPoint.AddressFamily, SocketType.Stream, ProtocolType.Tcp);
              listenSocket.NoDelay = true;
              //绑定端口
              listenSocket.Bind(localEndPoint);
              //挂起的连接队列的最大长度。
              listenSocket.Listen(1000);
              //在监听套接字上接受
              StartAccept(null);
              //发送线程
              for (int i = 0; i < sendthread; i++)
              {
                  Thread thread = new Thread(StartSend);
                  thread.IsBackground = true;
                  thread.Priority = ThreadPriority.AboveNormal;
                  thread.Start(i);
              }
              //超时机制
              if (overtime > 0)
              {
                  Thread heartbeat = new Thread(new ThreadStart(() =>
                  {
                      Heartbeat();
                  }));
                  heartbeat.IsBackground = true;
                  heartbeat.Priority = ThreadPriority.Lowest;
                  heartbeat.Start();
              }
          }
  
          /// <summary>
          /// 超时机制
          /// </summary>
          private void Heartbeat()
          {
              //计算超时次数 ，超过count就当客户端断开连接。服务端清除该连接资源
              int count = overtime / overtimecheck;
              while (true)
              {
                  foreach (var item in connectClient.Values)
                  {
                      if (item.keep_alive >= count)
                      {
                          item.keep_alive = 0;
                          CloseClientSocket(item.saea_receive);
                      }
                  }
                  foreach (var item in connectClient.Values)
                  {
                      item.keep_alive++;
                  }
                  Thread.Sleep(overtimecheck * 1000);
              }
          }
  
          #region Accept
  
          /// <summary>
          /// 开始接受客户端的连接请求的操作。
          /// </summary>
          /// <param name="acceptEventArg">发布时要使用的上下文对象服务器侦听套接字上的接受操作</param>
          private void StartAccept(SocketAsyncEventArgs acceptEventArg)
          {
              if (acceptEventArg == null)
              {
                  acceptEventArg = new SocketAsyncEventArgs();
                  acceptEventArg.Completed += new EventHandler<SocketAsyncEventArgs>(IO_Completed);
              }
              else
              {
                  // 套接字必须被清除，因为上下文对象正在被重用。
                  acceptEventArg.AcceptSocket = null;
              }
              m_maxNumberAcceptedClients.WaitOne();
              //准备一个客户端接入
              if (!listenSocket.AcceptAsync(acceptEventArg))
              {
                  ProcessAccept(acceptEventArg);
              }
          }
  
          /// <summary>
          /// 当异步连接完成时调用此方法
          /// </summary>
          /// <param name="e">操作对象</param>
          private void ProcessAccept(SocketAsyncEventArgs e)
          {
              connectId++;
              //把连接到的客户端信息添加到集合中
              ConnectClient connecttoken = new ConnectClient();
              connecttoken.socket = e.AcceptSocket;
              //从接受端重用池获取一个新的SocketAsyncEventArgs对象
              connecttoken.saea_receive = m_receivePool.Pop();
              connecttoken.saea_receive.UserToken = connectId;
              connecttoken.saea_receive.AcceptSocket = e.AcceptSocket;
              connectClient.TryAdd(connectId, connecttoken);
              //一旦客户机连接，就准备接收。
              if (!e.AcceptSocket.ReceiveAsync(connecttoken.saea_receive))
              {
                  ProcessReceive(connecttoken.saea_receive);
              }
              //事件回调
              if (OnAccept != null)
              {
                  OnAccept(connectId);
              }
              //接受第二连接的请求
              StartAccept(e);
          }
  
          #endregion
  
          #region 接受处理 receive
  
          /// <summary>
          /// 接受处理回调
          /// </summary>
          /// <param name="e">操作对象</param>
          private void ProcessReceive(SocketAsyncEventArgs e)
          {
              //检查远程主机是否关闭连接
              if (e.BytesTransferred > 0 && e.SocketError == SocketError.Success)
              {
                  int connectId = (int)e.UserToken;
                  ConnectClient client;
                  if (!connectClient.TryGetValue(connectId, out client))
                  {
                      return;
                  }
                  //如果接收到数据，超时记录设置为0
                  if (overtime > 0)
                  {
                      if (client != null)
                      {
                          client.keep_alive = 0;
                      }
                  }
                  //回调               
                  if (OnReceive != null)
                  {
                      if (client != null)
                      {
                          OnReceive(connectId, e.Buffer, e.Offset, e.BytesTransferred);
                      }
                  }
                  //准备下次接收数据      
                  try
                  {
                      if (!e.AcceptSocket.ReceiveAsync(e))
                      {
                          ProcessReceive(e);
                      }
                  }
                  catch (ObjectDisposedException ex)
                  {
                      if (OnClose != null)
                      {
                          OnClose(connectId);
                      }
                  }
              }
              else
              {
                  CloseClientSocket(e);
              }
          }
  
          #endregion
  
          #region 发送处理 send
  
          /// <summary>
          /// 开始启用发送
          /// </summary>
          private void StartSend(object thread)
          {
              while (true)
              {
                  SendingQueue sending;
                  if (sendQueues[(int)thread].TryDequeue(out sending))
                  {
                      Send(sending);
                  }
                  else
                  {
                      Thread.Sleep(100);
                  }
              }
          }
  
          /// <summary>
          /// 异步发送消息 
          /// </summary>
          /// <param name="connectId">连接ID</param>
          /// <param name="data">数据</param>
          /// <param name="offset">偏移位</param>
          /// <param name="length">长度</param>
          internal void Send(int connectId, byte[] data, int offset, int length)
          {
              sendQueues[connectId % sendthread].Enqueue(new SendingQueue() { connectId = connectId, data = data, offset = offset, length = length });
          }
  
          /// <summary>
          /// 异步发送消息 
          /// </summary>
          /// <param name="sendQuere">发送消息体</param>
          private void Send(SendingQueue sendQuere)
          {
              ConnectClient client;
              if (!connectClient.TryGetValue(sendQuere.connectId, out client))
              {
                  return;
              }
              //如果发送池为空时，临时新建一个放入池中
              mutex.WaitOne();
              if (m_sendPool.Count == 0)
              {
                  SocketAsyncEventArgs saea_send = new SocketAsyncEventArgs();
                  saea_send.Completed += new EventHandler<SocketAsyncEventArgs>(IO_Completed);
                  m_sendPool.Push(saea_send);
              }
              SocketAsyncEventArgs sendEventArgs = m_sendPool.Pop();
              mutex.ReleaseMutex();
              sendEventArgs.UserToken = sendQuere.connectId;
              sendEventArgs.SetBuffer(sendQuere.data, sendQuere.offset, sendQuere.length);
              try
              {
                  if (!client.socket.SendAsync(sendEventArgs))
                  {
                      ProcessSend(sendEventArgs);
                  }
              }
              catch (ObjectDisposedException ex)
              {
                  if (OnClose != null)
                  {
                      OnClose(sendQuere.connectId);
                  }
              }
              sendQuere = null;
          }
  
          /// <summary>
          /// 发送回调
          /// </summary>
          /// <param name="e">操作对象</param>
          private void ProcessSend(SocketAsyncEventArgs e)
          {
              if (e.SocketError == SocketError.Success)
              {
                  m_sendPool.Push(e);
                  if (OnSend != null)
                  {
                      OnSend((int)e.UserToken, e.BytesTransferred);
                  }
              }
              else
              {
                  CloseClientSocket(e);
              }
          }
  
          #endregion
  
          /// <summary>
          /// 每当套接字上完成接收或发送操作时，都会调用此方法。
          /// </summary>
          /// <param name="sender"></param>
          /// <param name="e">与完成的接收操作关联的SocketAsyncEventArg</param>
          private void IO_Completed(object sender, SocketAsyncEventArgs e)
          {
              //确定刚刚完成哪种类型的操作并调用相关的处理程序
              switch (e.LastOperation)
              {
                  case SocketAsyncOperation.Receive:
                      ProcessReceive(e);
                      break;
                  case SocketAsyncOperation.Send:
                      ProcessSend(e);
                      break;
                  case SocketAsyncOperation.Accept:
                      ProcessAccept(e);
                      break;
                  default:
                      break;
              }
          }
  
          #region 断开连接处理
  
  
          /// <summary>
          /// 客户端断开一个连接
          /// </summary>
          /// <param name="connectId">连接标记</param>
          internal void Close(int connectId)
          {
              ConnectClient client;
              if (!connectClient.TryGetValue(connectId, out client))
              {
                  return;
              }
              CloseClientSocket(client.saea_receive);
          }
  
          /// <summary>
          /// 断开一个连接
          /// </summary>
          /// <param name="e">操作对象</param>
          private void CloseClientSocket(SocketAsyncEventArgs e)
          {
              if (e.LastOperation == SocketAsyncOperation.Receive)
              {
                  int connectId = (int)e.UserToken;
                  ConnectClient client;
                  if (!connectClient.TryGetValue(connectId, out client))
                  {
                      return;
                  }
                  if (client.socket.Connected == false)
                  {
                      return;
                  }
                  try
                  {
                      client.socket.Shutdown(SocketShutdown.Both);
                  }
                  // 抛出客户端进程已经关闭
                  catch (Exception) { }
                  client.socket.Close();
                  m_receivePool.Push(e);
                  m_maxNumberAcceptedClients.Release();
                  if (OnClose != null)
                  {
                      OnClose(connectId);
                  }
                  connectClient.TryRemove((int)e.UserToken, out client);
                  client = null;
              }
          }
  
          #endregion
  
          #region 附加数据
  
          /// <summary>
          /// 给连接对象设置附加数据
          /// </summary>
          /// <param name="connectId">连接标识</param>
          /// <param name="data">附加数据</param>
          /// <returns>true:设置成功,false:设置失败</returns>
          internal bool SetAttached(int connectId, object data)
          {
              ConnectClient client;
              if (!connectClient.TryGetValue(connectId, out client))
              {
                  return false;
              }
              client.attached = data;
              return true;
          }
  
          /// <summary>
          /// 获取连接对象的附加数据
          /// </summary>
          /// <param name="connectId">连接标识</param>
          /// <returns>附加数据，如果没有找到则返回null</returns>
          internal T GetAttached<T>(int connectId)
          {
              ConnectClient client;
              if (!connectClient.TryGetValue(connectId, out client))
              {
                  return default(T);
              }
              else
              {
                  return (T)client.attached;
              }
          }
          #endregion
      }
  
  }
  
  socket核心类

   

  1.初始化UDP实现类UdpServer/UdpClients

  服务端socket.core.Server.UdpServer
  客户端socket.core.Client.UdpClients
  参数int receiveBufferSize用于每个套接字I/O操作的缓冲区大小(接收端)

• 2.发送数据

  服务端 server.Send(remoteEndPoint,data,offset,length)
  客户端 client.Send(data,offset,length)
  客户端 client.Send(remoteEndPoint,data,offset,length)

• 3.触发已发送事件

  服务端 server.OnSend(remoteEndPoint,length)
  客户端 client.OnSend(length)

• 3.触发接收事件

  服务端 server.OnReceive(remoteEndPoint,data,offset,length)
  客户端 client.OnReceive(data,offset,length)

原文：https://www.cnblogs.com/sung/p/11871407.html