C#中一个高性能异步socket封装库的实现思路分享

前言

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socket是软件之间通讯最常用的一种方式。c#实现socket通讯有很多中方法，其中效率最高就是异步通讯。

异步通讯实际是利用windows完成端口（IOCP）来处理的，关于完成端口实现原理，大家可以参考网上文章。

我这里想强调的是采用完成端口机制的异步通讯是windows下效率最高的通讯方式，没有之一！

异步通讯比同步通讯处理要难很多，代码编写中会遇到许多“坑“。如果没有经验，很难完成。

我搜集了大量资料，完成了对异步socket的封装。此库已用稳定高效的运行几个月。

纵观网上的资料，我还没有遇到一个满意的封装库。许多文章把数据收发和协议处理杂糅在一块，代码非常难懂，也无法扩展。

在编写该库时，避免以上缺陷。将逻辑处理层次化，模块化！同时实现了高可用性与高性能。

为了使大家对通讯效率有初步了解，先看测试图。

C#中一个高性能异步socket封装库的实现思路分享

主机配置情况

C#中一个高性能异步socket封装库的实现思路分享

百兆带宽基本占满，cpu占用40%，我的电脑在空闲时，cpu占用大概20%，也就是说程序占用cpu 20%左右。

这个库是可扩展的，就是说即使10万个连接，收发同样的数据，cpu占用基本相同。

库的结构图

C#中一个高性能异步socket封装库的实现思路分享

目标

即可作为服务端（监听）也可以作为客户端（主动连接）使用。

可以适应任何网络协议。收发的数据针对字节流或一个完整的包。对协议内容不做处理。

高可用性。将复杂的底层处理封装，对外接口非常友好。

高性能。最大限度优化处理。单机可支持数万连接，收发速度可达几百兆bit。

实现思路

网络处理逻辑可以分为以下几个部分：

网络监听可以在多个端口实现监听。负责生成socket，生成的socket供后续处理。监听模块功能比较单一，如有必要，可对监听模块做进一步优化。

主动连接可以异步或同步的连接对方。连接成功后，对socket的后续处理，与监听得到的socket完全一样。注：无论是监听得到的socket，还是连接得到的socket，后续处理完全一样。

Socket收发处理每个socket对应一个收发实例，socket收发只针对字节流处理。收发时，做了优化。比如发送时，对数据做了沾包，提高发送性能；接收时，一次投递1K的数据。

组包处理一般数据包都有包长度指示；比如报头的前俩个字节表示长度，根据这个值就可以组成一个完整的包。

NetListener 监听

using System;
using System.Net;
using System.Net.Sockets;
using System.Threading;
 
namespace IocpCore
{
 class NetListener
 {
  private Socket listenSocket;
  public ListenParam _listenParam { get; set; }
  public event Action OnAcceptSocket;
 
  bool start;
 
  NetServer _netServer;
  public NetListener(NetServer netServer)
  {
   _netServer = netServer;
  }
 
  public int _acceptAsyncCount = 0;
  public bool StartListen()
  {
   try
   {
    start = true;
    IPEndPoint listenPoint = new IPEndPoint(IPAddress.Parse("0.0.0.0"), _listenParam._port);
    listenSocket = new Socket(listenPoint.AddressFamily, SocketType.Stream, ProtocolType.Tcp);
    listenSocket.Bind(listenPoint);
    listenSocket.Listen(200);
 
    Thread thread1 = new Thread(new ThreadStart(NetProcess));
    thread1.Start();
    
    StartAccept();
    return true;
   }
   catch (Exception ex)
   {
    NetLogger.Log(string.Format("**监听异常!{0}", ex.Message));
    return false;
   }
  }
 
  AutoResetEvent _acceptEvent = new AutoResetEvent(false);
  private void NetProcess()
  {
   while (start)
   {
    DealNewAccept();
    _acceptEvent.WaitOne(1000 * 10);
   }
  }
 
  private void DealNewAccept()
  {
   try
   {
    if(_acceptAsyncCount <= 10)
    {
     StartAccept();
    }
 
    while (true)
    {
     AsyncSocketClient client = _newSocketClientList.GetObj();
     if (client == null)
      break;
 
     DealNewAccept(client);
    }
   }
   catch (Exception ex)
   {
    NetLogger.Log(string.Format("DealNewAccept 异常 {0}***{1}", ex.Message, ex.StackTrace));
   }
  }
 
  private void DealNewAccept(AsyncSocketClient client)
  {
   client.SendBufferByteCount = _netServer.SendBufferBytePerClient;
   OnAcceptSocket?.Invoke(_listenParam, client);
  }
 
  private void AcceptEventArg_Completed(object sender, SocketAsyncEventArgs acceptEventArgs)
  {
   try
   {
    Interlocked.Decrement(ref _acceptAsyncCount);
    _acceptEvent.Set();
    acceptEventArgs.Completed -= AcceptEventArg_Completed;
    ProcessAccept(acceptEventArgs);
   }
   catch (Exception ex)
   {
    NetLogger.Log(string.Format("AcceptEventArg_Completed {0}***{1}", ex.Message, ex.StackTrace));
   }
  }
 
  public bool StartAccept()
  {
   SocketAsyncEventArgs acceptEventArgs = new SocketAsyncEventArgs();
   acceptEventArgs.Completed += AcceptEventArg_Completed;
 
   bool willRaiseEvent = listenSocket.AcceptAsync(acceptEventArgs);
   Interlocked.Increment(ref _acceptAsyncCount);
 
   if (!willRaiseEvent)
   {
    Interlocked.Decrement(ref _acceptAsyncCount);
    _acceptEvent.Set();
    acceptEventArgs.Completed -= AcceptEventArg_Completed;
    ProcessAccept(acceptEventArgs);
   }
   return true;
  }
 
  ObjectPool _newSocketClientList = new ObjectPool();
  private void ProcessAccept(SocketAsyncEventArgs acceptEventArgs)
  {
   try
   {
    using (acceptEventArgs)
    {
     if (acceptEventArgs.AcceptSocket != null)
     {
      AsyncSocketClient client = new AsyncSocketClient(acceptEventArgs.AcceptSocket);
      client.CreateClientInfo(this);
 
      _newSocketClientList.PutObj(client);
      _acceptEvent.Set();
     }
    }
   }
   catch (Exception ex)
   {
    NetLogger.Log(string.Format("ProcessAccept {0}***{1}", ex.Message, ex.StackTrace));
   }
  }
 }
}

NetConnectManage连接处理

using System;
using System.Net;
using System.Net.Sockets;

namespace IocpCore
{
 class NetConnectManage
 {
  public event Action OnSocketConnectEvent;

  public bool ConnectAsyn(string peerIp, int peerPort, object tag)
  {
   try
   {
    Socket socket = new Socket(SocketType.Stream, ProtocolType.Tcp);
    SocketAsyncEventArgs socketEventArgs = new SocketAsyncEventArgs();
    socketEventArgs.RemoteEndPoint = new IPEndPoint(IPAddress.Parse(peerIp), peerPort);
    socketEventArgs.Completed += SocketConnect_Completed;

    SocketClientInfo clientInfo = new SocketClientInfo();
    socketEventArgs.UserToken = clientInfo;
    clientInfo.PeerIp = peerIp;
    clientInfo.PeerPort = peerPort;
    clientInfo.Tag = tag;

    bool willRaiseEvent = socket.ConnectAsync(socketEventArgs);
    if (!willRaiseEvent)
    {
     ProcessConnect(socketEventArgs);
     socketEventArgs.Completed -= SocketConnect_Completed;
     socketEventArgs.Dispose();
    }
    return true;
   }
   catch (Exception ex)
   {
    NetLogger.Log("ConnectAsyn",ex);
    return false;
   }
  }

  private void SocketConnect_Completed(object sender, SocketAsyncEventArgs socketEventArgs)
  {
   ProcessConnect(socketEventArgs);
   socketEventArgs.Completed -= SocketConnect_Completed;
   socketEventArgs.Dispose();
  }

  private void ProcessConnect(SocketAsyncEventArgs socketEventArgs)
  {
   SocketClientInfo clientInfo = socketEventArgs.UserToken as SocketClientInfo;
   if (socketEventArgs.SocketError == SocketError.Success)
   {
    DealConnectSocket(socketEventArgs.ConnectSocket, clientInfo);
   }
   else
   {
    SocketEventParam socketParam = new SocketEventParam(EN_SocketEvent.connect, null);
    socketParam.ClientInfo = clientInfo;
    OnSocketConnectEvent?.Invoke(socketParam, null);
   }
  }


  void DealConnectSocket(Socket socket, SocketClientInfo clientInfo)
  {
   clientInfo.SetClientInfo(socket);

   AsyncSocketClient client = new AsyncSocketClient(socket);
   client.SetClientInfo(clientInfo);

   //触发事件
   SocketEventParam socketParam = new SocketEventParam(EN_SocketEvent.connect, socket);
   socketParam.ClientInfo = clientInfo;
   OnSocketConnectEvent?.Invoke(socketParam, client);
  }

  public bool Connect(string peerIp, int peerPort, object tag, out Socket socket)
  {
   socket = null;
   try
   {
    Socket socketTmp = new Socket(SocketType.Stream, ProtocolType.Tcp);

    SocketClientInfo clientInfo = new SocketClientInfo();
    clientInfo.PeerIp = peerIp;
    clientInfo.PeerPort = peerPort;
    clientInfo.Tag = tag;

    EndPoint remoteEP = new IPEndPoint(IPAddress.Parse(peerIp), peerPort);
    socketTmp.Connect(remoteEP);
    if (!socketTmp.Connected)
     return false;

    DealConnectSocket(socketTmp, clientInfo);
    socket = socketTmp;
    return true;
   }
   catch (Exception ex)
   {
    NetLogger.Log(string.Format("连接对方:({0}:{1})出错！", peerIp, peerPort), ex);
    return false;
   }
  }
 }
}

AsyncSocketClient socket收发处理

using System;
using System.Collections.Generic;
using System.Diagnostics;
using System.Net;
using System.Net.Sockets;

namespace IocpCore
{
 public class AsyncSocketClient
 {
  public static int IocpReadLen = 1024;

  public readonly Socket ConnectSocket;

  protected SocketAsyncEventArgs m_receiveEventArgs;
  public SocketAsyncEventArgs ReceiveEventArgs { get { return m_receiveEventArgs; } set { m_receiveEventArgs = value; } }
  protected byte[] m_asyncReceiveBuffer;

  protected SocketAsyncEventArgs m_sendEventArgs;
  public SocketAsyncEventArgs SendEventArgs { get { return m_sendEventArgs; } set { m_sendEventArgs = value; } }
  protected byte[] m_asyncSendBuffer;

  public event Action OnReadData;
  public event Action OnSendData;
  public event Action OnSocketClose;

  static object releaseLock = new object();
  public static int createCount = 0;
  public static int releaseCount = 0;

  ~AsyncSocketClient()
  {
   lock (releaseLock)
   {
    releaseCount++;
   }
  }

  public AsyncSocketClient(Socket socket)
  {
   lock (releaseLock)
   {
    createCount++;
   }

   ConnectSocket = socket;

   m_receiveEventArgs = new SocketAsyncEventArgs();
   m_asyncReceiveBuffer = new byte[IocpReadLen];
   m_receiveEventArgs.AcceptSocket = ConnectSocket;
   m_receiveEventArgs.Completed += ReceiveEventArgs_Completed;

   m_sendEventArgs = new SocketAsyncEventArgs();
   m_asyncSendBuffer = new byte[IocpReadLen * 2];
   m_sendEventArgs.AcceptSocket = ConnectSocket;
   m_sendEventArgs.Completed += SendEventArgs_Completed;
  }

  SocketClientInfo _clientInfo;

  public SocketClientInfo ClientInfo
  {
   get
   {
    return _clientInfo;
   }
  }

  internal void CreateClientInfo(NetListener netListener)
  {
   _clientInfo = new SocketClientInfo();
   try
   {
    _clientInfo.Tag = netListener._listenParam._tag;
    IPEndPoint ip = ConnectSocket.LocalEndPoint as IPEndPoint;
    Debug.Assert(netListener._listenParam._port == ip.Port);

    _clientInfo.LocalIp = ip.Address.ToString();
    _clientInfo.LocalPort = netListener._listenParam._port;

    ip = ConnectSocket.RemoteEndPoint as IPEndPoint;
    _clientInfo.PeerIp = ip.Address.ToString();
    _clientInfo.PeerPort = ip.Port;
   }
   catch (Exception ex)
   {
    NetLogger.Log("CreateClientInfo", ex);
   }
  }
  internal void SetClientInfo(SocketClientInfo clientInfo)
  {
   _clientInfo = clientInfo;
  }

  #region read process
  bool _inReadPending = false;
  public EN_SocketReadResult ReadNextData()
  {
   lock (this)
   {
    if (_socketError)
     return EN_SocketReadResult.ReadError;
    if (_inReadPending)
     return EN_SocketReadResult.InAsyn;
    if(!ConnectSocket.Connected)
    {
     OnReadError();
     return EN_SocketReadResult.ReadError;
    }

    try
    {
     m_receiveEventArgs.SetBuffer(m_asyncReceiveBuffer, 0, m_asyncReceiveBuffer.Length);
     _inReadPending = true;
     bool willRaiseEvent = ConnectSocket.ReceiveAsync(ReceiveEventArgs); //投递接收请求
     if (!willRaiseEvent)
     {
      _inReadPending = false;
      ProcessReceive();
      if (_socketError)
      {
       OnReadError();
       return EN_SocketReadResult.ReadError;
      }
      return EN_SocketReadResult.HaveRead;
     }
     else
     {
      return EN_SocketReadResult.InAsyn;
     }
    }
    catch (Exception ex)
    {
     NetLogger.Log("ReadNextData", ex);
     _inReadPending = false;
     OnReadError();
     return EN_SocketReadResult.ReadError;
    }
   }
  }

  private void ProcessReceive()
  {
   if (ReceiveEventArgs.BytesTransferred > 0
    && ReceiveEventArgs.SocketError == SocketError.Success)
   {
    int offset = ReceiveEventArgs.Offset;
    int count = ReceiveEventArgs.BytesTransferred;

    byte[] readData = new byte[count];
    Array.Copy(m_asyncReceiveBuffer, offset, readData, 0, count);

    _inReadPending = false;
    if (!_socketError)
     OnReadData?.Invoke(this, readData);
   }
   else
   {
    _inReadPending = false;
    OnReadError();
   }
  }

  private void ReceiveEventArgs_Completed(object sender, SocketAsyncEventArgs e)
  {
   lock (this)
   {
    _inReadPending = false;
    ProcessReceive();
    if (_socketError)
    {
     OnReadError();
    }
   }
  }

  bool _socketError = false;
  private void OnReadError()
  {
   lock (this)
   {
    if (_socketError == false)
    {
     _socketError = true;
     OnSocketClose?.Invoke(this);
    }
    CloseClient();
   }
  }
  #endregion

  #region send process
  int _sendBufferByteCount = 102400;
  public int SendBufferByteCount
  {
   get
   {
    return _sendBufferByteCount;
   }
   set
   {
    if (value < 1024)
    {
     _sendBufferByteCount = 1024;
    }
    else
    {
     _sendBufferByteCount = value;
    }
   }
  }

  SendBufferPool _sendDataPool = new SendBufferPool();
  internal EN_SendDataResult PutSendData(byte[] data)
  {
   if (_socketError)
    return EN_SendDataResult.no_client;

   if (_sendDataPool._bufferByteCount >= _sendBufferByteCount)
   {
    return EN_SendDataResult.buffer_overflow;
   }

   if (data.Length <= IocpReadLen)
   {
    _sendDataPool.PutObj(data);
   }
   else
   {
    List dataItems = SplitData(data, IocpReadLen);
    foreach (byte[] item in dataItems)
    {
     _sendDataPool.PutObj(item);
    }
   }

   return EN_SendDataResult.ok;
  }

  bool _inSendPending = false;
  public EN_SocketSendResult SendNextData()
  {
   lock (this)
   {
    if (_socketError)
    {
     return EN_SocketSendResult.SendError;
    }

    if (_inSendPending)
    {
     return EN_SocketSendResult.InAsyn;
    }

    int sendByteCount = GetSendData();
    if (sendByteCount == 0)
    {
     return EN_SocketSendResult.NoSendData;
    }

    //防止抛出异常，否则影响性能
    if (!ConnectSocket.Connected)
    {
     OnSendError();
     return EN_SocketSendResult.SendError;
    }

    try
    {
     m_sendEventArgs.SetBuffer(m_asyncSendBuffer, 0, sendByteCount);
     _inSendPending = true;
     bool willRaiseEvent = ConnectSocket.SendAsync(m_sendEventArgs);
     if (!willRaiseEvent)
     {
      _inSendPending = false;
      ProcessSend(m_sendEventArgs);
      if (_socketError)
      {
       OnSendError();
       return EN_SocketSendResult.SendError;
      }
      else
      {
       OnSendData?.Invoke(this, sendByteCount);
       //继续发下一条
       return EN_SocketSendResult.HaveSend;
      }
     }
     else
     {
      return EN_SocketSendResult.InAsyn;
     }
    }
    catch (Exception ex)
    {
     NetLogger.Log("SendNextData", ex);
     _inSendPending = false;
     OnSendError();
     return EN_SocketSendResult.SendError;
    }
   }
  }

  private void SendEventArgs_Completed(object sender, SocketAsyncEventArgs sendEventArgs)
  {
   lock (this)
   {
    try
    {
     _inSendPending = false;
     ProcessSend(m_sendEventArgs);

     int sendCount = 0;
     if (sendEventArgs.SocketError == SocketError.Success)
     {
      sendCount = sendEventArgs.BytesTransferred;
     }
     OnSendData?.Invoke(this, sendCount);

     if (_socketError)
     {
      OnSendError();
     }
    }
    catch (Exception ex)
    {
     NetLogger.Log("SendEventArgs_Completed", ex);
    }
   }
  }

  private bool ProcessSend(SocketAsyncEventArgs sendEventArgs)
  {
   if (sendEventArgs.SocketError == SocketError.Success)
   {
    return true;
   }
   else
   {
    OnSendError();
    return false;
   }
  }

  private int GetSendData()
  {
   int dataLen = 0;
   while (true)
   {
    byte[] data = _sendDataPool.GetObj();
    if (data == null)
     return dataLen;
    Array.Copy(data, 0, m_asyncSendBuffer, dataLen, data.Length);
    dataLen += data.Length;
    if (dataLen > IocpReadLen)
     break;
   }
   return dataLen;
  }
  private void OnSendError()
  {
   lock (this)
   {
    if (_socketError == false)
    {
     _socketError = true;
     OnSocketClose?.Invoke(this);
    }
    CloseClient();
   }
  }
  #endregion

  internal void CloseSocket()
  {
   try
   {
    ConnectSocket.Close();
   }
   catch (Exception ex)
   {
    NetLogger.Log("CloseSocket", ex);
   }
  }

  static object socketCloseLock = new object();
  public static int closeSendCount = 0;
  public static int closeReadCount = 0;

  bool _disposeSend = false;
  void CloseSend()
  {
   if (!_disposeSend && !_inSendPending)
   {
    lock (socketCloseLock)
     closeSendCount++;

    _disposeSend = true;
    m_sendEventArgs.SetBuffer(null, 0, 0);
    m_sendEventArgs.Completed -= SendEventArgs_Completed;
    m_sendEventArgs.Dispose();
   }
  }

  bool _disposeRead = false;
  void CloseRead()
  {
   if (!_disposeRead && !_inReadPending)
   {
    lock (socketCloseLock)
     closeReadCount++;

    _disposeRead = true;
    m_receiveEventArgs.SetBuffer(null, 0, 0);
    m_receiveEventArgs.Completed -= ReceiveEventArgs_Completed;
    m_receiveEventArgs.Dispose();
   }
  }
  private void CloseClient()
  {
   try
   {
    CloseSend();
    CloseRead();
    ConnectSocket.Close();
   }
   catch (Exception ex)
   {
    NetLogger.Log("CloseClient", ex);
   }
  }

  //发送缓冲大小
  private List SplitData(byte[] data, int maxLen)
  {
   List items = new List();

   int start = 0;
   while (true)
   {
    int itemLen = Math.Min(maxLen, data.Length - start);
    if (itemLen == 0)
     break;
    byte[] item = new byte[itemLen];
    Array.Copy(data, start, item, 0, itemLen);
    items.Add(item);

    start += itemLen;
   }
   return items;
  }
 }

 public enum EN_SocketReadResult
 {
  InAsyn,
  HaveRead,
  ReadError
 }

 public enum EN_SocketSendResult
 {
  InAsyn,
  HaveSend,
  NoSendData,
  SendError
 }

 class SendBufferPool
 {
  ObjectPool _bufferPool = new ObjectPool();

  public Int64 _bufferByteCount = 0;
  public bool PutObj(byte[] obj)
  {
   if (_bufferPool.PutObj(obj))
   {
    lock (this)
    {
     _bufferByteCount += obj.Length;
    }
    return true;
   }
   else
   {
    return false;
   }
  }

  public byte[] GetObj()
  {
   byte[] result = _bufferPool.GetObj();
   if (result != null)
   {
    lock (this)
    {
     _bufferByteCount -= result.Length;
    }
   }
   return result;
  }
 }
}

NetServer 聚合其他类

using System;
using System.Collections.Generic;
using System.Diagnostics;
using System.Linq;
using System.Net.Sockets;
using System.Threading;

namespace IocpCore
{
 public class NetServer
 {
  public Action OnSocketPacketEvent;

  //每个连接发送缓冲大小
  public int SendBufferBytePerClient { get; set; } = 1024 * 100;

  bool _serverStart = false;
  List _listListener = new List();

  //负责对收到的字节流 组成完成的包
  ClientPacketManage _clientPacketManage;

  public Int64 SendByteCount { get; set; }
  public Int64 ReadByteCount { get; set; }

  List _listListenPort = new List();
  public void AddListenPort(int port, object tag)
  {
   _listListenPort.Add(new ListenParam(port, tag));
  }
  /// 
  /// 
  /// 
  /// 监听失败的端口
  /// 
  public bool StartListen(out List listenFault)
  {
   _serverStart = true;

   _clientPacketManage = new ClientPacketManage(this);
   _clientPacketManage.OnSocketPacketEvent += PutClientPacket;

   _netConnectManage.OnSocketConnectEvent += SocketConnectEvent;

   _listListener.Clear();
   Thread thread1 = new Thread(new ThreadStart(NetPacketProcess));
   thread1.Start();

   Thread thread2 = new Thread(new ThreadStart(NetSendProcess));
   thread2.Start();

   Thread thread3 = new Thread(new ThreadStart(NetReadProcess));
   thread3.Start();

   listenFault = new List();
   foreach (ListenParam param in _listListenPort)
   {
    NetListener listener = new NetListener(this);
    listener._listenParam = param;
    listener.OnAcceptSocket += Listener_OnAcceptSocket;
    if (!listener.StartListen())
    {
     listenFault.Add(param._port);
    }
    else
    {
     _listListener.Add(listener);
     NetLogger.Log(string.Format("监听成功！端口:{0}", param._port));
    }
   }

   return listenFault.Count == 0;
  }

  public void PutClientPacket(SocketEventParam param)
  {
   OnSocketPacketEvent?.Invoke(param);
  }

  //获取包的最小长度
  int _packetMinLen;
  int _packetMaxLen;
  public int PacketMinLen
  {
   get { return _packetMinLen; }
  }
  public int PacketMaxLen
  {
   get { return _packetMaxLen; }
  }

  /// 
  /// 设置包的最小和最大长度
  /// 当minLen=0时，认为是接收字节流
  /// 
  /// 
  /// 
  public void SetPacketParam(int minLen, int maxLen)
  {
   Debug.Assert(minLen >= 0);
   Debug.Assert(maxLen > minLen);
   _packetMinLen = minLen;
   _packetMaxLen = maxLen;
  }

  //获取包的总长度
  public delegate int delegate_GetPacketTotalLen(byte[] data, int offset);
  public delegate_GetPacketTotalLen GetPacketTotalLen_Callback;

  ObjectPoolWithEvent _socketEventPool = new ObjectPoolWithEvent();
  private void NetPacketProcess()
  {
   while (_serverStart)
   {
    try
    {
     DealEventPool();
    }
    catch (Exception ex)
    {
     NetLogger.Log(string.Format("DealEventPool 异常 {0}***{1}", ex.Message, ex.StackTrace));
    }
    _socketEventPool.WaitOne(1000);
   }
  }

  Dictionary _clientGroup = new Dictionary();
  public int ClientCount
  {
   get
   {
    lock (_clientGroup)
    {
     return _clientGroup.Count;
    }
   }
  }
  public List ClientList
  {
   get
   {
    lock (_clientGroup)
    {
     return _clientGroup.Keys.ToList();
    }
   }
  }

  private void DealEventPool()
  {
   while (true)
   {
    SocketEventParam param = _socketEventPool.GetObj();
    if (param == null)
     return;

    if (param.SocketEvent == EN_SocketEvent.close)
    {
     lock (_clientGroup)
     {
      _clientGroup.Remove(param.Socket);
     }
    }

    if (_packetMinLen == 0)//字节流处理
    {
     OnSocketPacketEvent?.Invoke(param);
    }
    else
    {
     //组成一个完整的包 逻辑
     _clientPacketManage.PutSocketParam(param);
    }
   }
  }

  private void SocketConnectEvent(SocketEventParam param, AsyncSocketClient client)
  {
   try
   {
    if (param.Socket == null || client == null) //连接失败
    {
     
    }
    else
    {
     lock (_clientGroup)
     {
      bool remove = _clientGroup.Remove(client.ConnectSocket);
      Debug.Assert(!remove);
      _clientGroup.Add(client.ConnectSocket, client);
     }

     client.OnSocketClose += Client_OnSocketClose;
     client.OnReadData += Client_OnReadData;
     client.OnSendData += Client_OnSendData;

     _listReadEvent.PutObj(new SocketEventDeal(client, EN_SocketDealEvent.read));
    }
    _socketEventPool.PutObj(param);
   }
   catch (Exception ex)
   {
    NetLogger.Log(string.Format("SocketConnectEvent 异常 {0}***{1}", ex.Message, ex.StackTrace));
   }
  }

  internal void OnRcvPacketLenError(Socket socket, byte[] buffer, int offset, int packetLen)
  {
   try
   {
    lock (_clientGroup)
    {
     if (!_clientGroup.ContainsKey(socket))
     {
      Debug.Assert(false);
      return;
     }

     NetLogger.Log(string.Format("报长度异常!包长:{0}", packetLen));
     AsyncSocketClient client = _clientGroup[socket];
     client.CloseSocket();
    }
   }
   catch (Exception ex)
   {
    NetLogger.Log(string.Format("OnRcvPacketLenError 异常 {0}***{1}", ex.Message, ex.StackTrace));
   }
  }

  #region listen port
  private void Listener_OnAcceptSocket(ListenParam listenPatam, AsyncSocketClient client)
  {
   try
   {
    lock (_clientGroup)
    {
     bool remove = _clientGroup.Remove(client.ConnectSocket);
     Debug.Assert(!remove);
     _clientGroup.Add(client.ConnectSocket, client);
    }

    client.OnSocketClose += Client_OnSocketClose;
    client.OnReadData += Client_OnReadData;
    client.OnSendData += Client_OnSendData;

    _listReadEvent.PutObj(new SocketEventDeal(client, EN_SocketDealEvent.read));

    SocketEventParam param = new SocketEventParam(EN_SocketEvent.accept, client.ConnectSocket);
    param.ClientInfo = client.ClientInfo;

    _socketEventPool.PutObj(param);
   }
   catch (Exception ex)
   {
    NetLogger.Log(string.Format("Listener_OnAcceptSocket 异常 {0}***{1}", ex.Message, ex.StackTrace));
   }
  }


  ObjectPoolWithEvent _listSendEvent = new ObjectPoolWithEvent();
  private void NetSendProcess()
  {
   while (true)
   {
    DealSendEvent();
    _listSendEvent.WaitOne(1000);
   }
  }

  ObjectPoolWithEvent _listReadEvent = new ObjectPoolWithEvent();
  private void NetReadProcess()
  {
   while (true)
   {
    DealReadEvent();
    _listReadEvent.WaitOne(1000);
   }
  }

  
  private void DealSendEvent()
  {
   while (true)
   {
    SocketEventDeal item = _listSendEvent.GetObj();
    if (item == null)
     break;
    switch (item.SocketEvent)
    {
     case EN_SocketDealEvent.send:
      {
       while (true)
       {
        EN_SocketSendResult result = item.Client.SendNextData();
        if (result == EN_SocketSendResult.HaveSend)
         continue;
        else
         break;
       }
      }
      break;
     case EN_SocketDealEvent.read:
      {
       Debug.Assert(false);
      }
      break;     
    }
   }
  }

  private void DealReadEvent()
  {
   while (true)
   {
    SocketEventDeal item = _listReadEvent.GetObj();
    if (item == null)
     break;
    switch (item.SocketEvent)
    {
     case EN_SocketDealEvent.read:
      {
       while (true)
       {
        EN_SocketReadResult result = item.Client.ReadNextData();
        if (result == EN_SocketReadResult.HaveRead)
         continue;
        else
         break;
       }
      }
      break;
     case EN_SocketDealEvent.send:
      {
       Debug.Assert(false);
      }
      break;
    }
   }
  }

  private void Client_OnReadData(AsyncSocketClient client, byte[] readData)
  {
   //读下一条
   _listReadEvent.PutObj(new SocketEventDeal(client, EN_SocketDealEvent.read));

   try
   {
    SocketEventParam param = new SocketEventParam(EN_SocketEvent.read, client.ConnectSocket);
    param.ClientInfo = client.ClientInfo;
    param.Data = readData;
    _socketEventPool.PutObj(param);

    lock (this)
    {
     ReadByteCount += readData.Length;
    }
   }
   catch (Exception ex)
   {
    NetLogger.Log(string.Format("Client_OnReadData 异常 {0}***{1}", ex.Message, ex.StackTrace));
   }
  }
#endregion

  private void Client_OnSendData(AsyncSocketClient client, int sendCount)
  {
   //发送下一条
   _listSendEvent.PutObj(new SocketEventDeal(client, EN_SocketDealEvent.send));
   lock (this)
   {
    SendByteCount += sendCount;
   }
  }

  private void Client_OnSocketClose(AsyncSocketClient client)
  {
   try
   {
    SocketEventParam param = new SocketEventParam(EN_SocketEvent.close, client.ConnectSocket);
    param.ClientInfo = client.ClientInfo;
    _socketEventPool.PutObj(param);
   }
   catch (Exception ex)
   {
    NetLogger.Log(string.Format("Client_OnSocketClose 异常 {0}***{1}", ex.Message, ex.StackTrace));
   }
  }

  /// 
  /// 放到发送缓冲
  /// 
  /// 
  /// 
  /// 
  public EN_SendDataResult SendData(Socket socket, byte[] data)
  {
   if (socket == null)
    return EN_SendDataResult.no_client;
   lock (_clientGroup)
   {
    if (!_clientGroup.ContainsKey(socket))
     return EN_SendDataResult.no_client;
    AsyncSocketClient client = _clientGroup[socket];
    EN_SendDataResult result = client.PutSendData(data);
    if (result == EN_SendDataResult.ok)
    {
     //发送下一条
     _listSendEvent.PutObj(new SocketEventDeal(client, EN_SocketDealEvent.send));     
    }
    return result;
   }
  }

  /// 
  /// 设置某个连接的发送缓冲大小
  /// 
  /// 
  /// 
  /// 
  public bool SetClientSendBuffer(Socket socket, int byteCount)
  {
   lock (_clientGroup)
   {
    if (!_clientGroup.ContainsKey(socket))
     return false;
    AsyncSocketClient client = _clientGroup[socket];
    client.SendBufferByteCount = byteCount;
    return true;
   }
  }


  #region connect process
  NetConnectManage _netConnectManage = new NetConnectManage();
  /// 
  /// 异步连接一个客户端
  /// 
  /// 
  /// 
  /// 
  /// 
  public bool ConnectAsyn(string peerIp, int peerPort, object tag)
  {
   return _netConnectManage.ConnectAsyn(peerIp, peerPort, tag);
  }

  /// 
  /// 同步连接一个客户端
  /// 
  /// 
  /// 
  /// 
  /// 
  /// 
  public bool Connect(string peerIp, int peerPort, object tag, out Socket socket)
  {
   return _netConnectManage.Connect(peerIp, peerPort, tag, out socket);
  }
  #endregion
 }

 enum EN_SocketDealEvent
 {
  read,
  send,
 }
 class SocketEventDeal
 {
  public AsyncSocketClient Client { get; set; }
  public EN_SocketDealEvent SocketEvent { get; set; }
  public SocketEventDeal(AsyncSocketClient client, EN_SocketDealEvent socketEvent)
  {
   Client = client;
   SocketEvent = socketEvent;
  }
 }
}

库的使用

使用起来非常简单，示例如下

using IocpCore;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Net.Sockets;
using System.Text;
using System.Threading.Tasks;
using System.Windows;

namespace WarningClient
{
 public class SocketServer
 {
  public Action OnSocketEvent;

  public Int64 SendByteCount
  {
   get
   {
    if (_netServer == null)
     return 0;
    return _netServer.SendByteCount;
   }
  }
  public Int64 ReadByteCount
  {
   get
   {
    if (_netServer == null)
     return 0;
    return _netServer.ReadByteCount;
   }
  }

  NetServer _netServer;
  EN_PacketType _packetType = EN_PacketType.byteStream;
  public void SetPacktType(EN_PacketType packetType)
  {
   _packetType = packetType;
   if (_netServer == null)
    return;
   if (packetType == EN_PacketType.byteStream)
   {
    _netServer.SetPacketParam(0, 1024);
   }
   else
   {
    _netServer.SetPacketParam(9, 1024);
   }
  }

  public bool Init(List listenPort)
  {
   NetLogger.OnLogEvent += NetLogger_OnLogEvent;
   _netServer = new NetServer();
   SetPacktType(_packetType);
   _netServer.GetPacketTotalLen_Callback += GetPacketTotalLen;
   _netServer.OnSocketPacketEvent += SocketPacketDeal;

   foreach (int n in listenPort)
   {
    _netServer.AddListenPort(n, n);
   }

   List listenFault;
   bool start = _netServer.StartListen(out listenFault);
   return start;
  }

  int GetPacketTotalLen(byte[] data, int offset)
  {
   if (MainWindow._packetType == EN_PacketType.znss)
    return GetPacketZnss(data, offset);
   else
    return GetPacketAnzhiyuan(data, offset);
  }

  int GetPacketAnzhiyuan(byte[] data, int offset)
  {
   int n = data[offset + 5] + 6;
   return n;
  }

  int GetPacketZnss(byte[] data, int offset)
  {
   int packetLen = (int)(data[4]) + 5;
   return packetLen;
  }


  public bool ConnectAsyn(string peerIp, int peerPort, object tag)
  {
   return _netServer.ConnectAsyn(peerIp, peerPort, tag);
  }

  public bool Connect(string peerIp, int peerPort, object tag, out Socket socket)
  {
   return _netServer.Connect(peerIp, peerPort, tag, out socket);
  }

  private void NetLogger_OnLogEvent(string message)
  {
   AppLog.Log(message);
  }

  Dictionary _clientGroup = new Dictionary();

  public int ClientCount
  {
   get
   {
    lock (_clientGroup)
    {
     return _clientGroup.Count;
    }
   }
  }
  public List ClientList
  {
   get
   {
    if (_netServer != null)
     return _netServer.ClientList;
    return new List();
   }
  }
  void AddClient(SocketEventParam socketParam)
  {
   lock (_clientGroup)
   {
    _clientGroup.Remove(socketParam.Socket);
    _clientGroup.Add(socketParam.Socket, socketParam);
   }
  }

  void RemoveClient(SocketEventParam socketParam)
  {
   lock (_clientGroup)
   {
    _clientGroup.Remove(socketParam.Socket);
   }
  }

  ObjectPool _readDataPool = new ObjectPool();

  public ObjectPool ReadDataPool
  {
   get
   {
    return _readDataPool;
   }
  }

  private void SocketPacketDeal(SocketEventParam socketParam)
  {
   OnSocketEvent?.Invoke(socketParam);
   if (socketParam.SocketEvent == EN_SocketEvent.read)
   {
    if (MainWindow._isShowReadPacket)
     _readDataPool.PutObj(socketParam);
   }
   else if (socketParam.SocketEvent == EN_SocketEvent.accept)
   {
    AddClient(socketParam);
    string peerIp = socketParam.ClientInfo.PeerIpPort;
    AppLog.Log(string.Format("客户端链接!本地端口:{0},对端:{1}",
     socketParam.ClientInfo.LocalPort, peerIp));
   }
   else if (socketParam.SocketEvent == EN_SocketEvent.connect)
   {
    string peerIp = socketParam.ClientInfo.PeerIpPort;
    if (socketParam.Socket != null)
    {
     AddClient(socketParam);

     AppLog.Log(string.Format("连接对端成功!本地端口:{0},对端:{1}",
      socketParam.ClientInfo.LocalPort, peerIp));
    }
    else
    {
     AppLog.Log(string.Format("连接对端失败!本地端口:{0},对端:{1}",
      socketParam.ClientInfo.LocalPort, peerIp));
    }
   }
   else if (socketParam.SocketEvent == EN_SocketEvent.close)
   {
    MainWindow.MainWnd.OnSocketDisconnect(socketParam.Socket);
    RemoveClient(socketParam);
    string peerIp = socketParam.ClientInfo.PeerIpPort;
    AppLog.Log(string.Format("客户端断开!本地端口:{0},对端:{1},",
     socketParam.ClientInfo.LocalPort, peerIp));
   }
  }

  public EN_SendDataResult SendData(Socket socket, byte[] data)
  {
   if(socket == null)
   {
    MessageBox.Show("还没连接！");
    return EN_SendDataResult.no_client;
   }
   return _netServer.SendData(socket, data);
  }

  internal void SendToAll(byte[] data)
  {
   lock (_clientGroup)
   {
    foreach (Socket socket in _clientGroup.Keys)
    {
     SendData(socket, data);
    }
   }
  }
 }
}

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C#中一个高性能异步socket封装库的实现思路分享

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