异步tcp通信——APM.Core 解包

TCP通信解包

　　虽说这是一个老生长谈的问题，不过网上基本很少见完整业务；或多或少都没有写完或者存在bug。接收到的数据包可以简单分成：小包、大包、跨包三种情况，根据这三种情况作相对应的拆包处理，示例如下：

 /*****************************************************************************************************
  * 本代码版权归@wenli所有，All Rights Reserved (C) 2015-2016
  *****************************************************************************************************
  * CLR版本：4.0.30319.42000
  * 唯一标识：7a846c42-665d-4628-b91f-9d58b670437d
  * 机器名称：WENLI-PC
  * 联系人邮箱：wenguoli_520@qq.com
  *****************************************************************************************************
  * 项目名称：$projectname$
  * 命名空间：APM.Core
  * 类名称：UserToken
  * 创建时间：2016/11/30 16:56:29
  * 创建人：wenli
  * 创建说明：
  *****************************************************************************************************/
 using System;
 using System.Net.Sockets;

 namespace APM.Core
 {
     /// <summary>
     /// tcp用户信息
     /// </summary>
     public class UserToken
     {
         private int offset, count = ;

         private byte[] _myBuffer;

         private byte[] _myLenBuffer;

         public int MaxBufferSize
         {
             get; private set;
         }

         /// <summary>
         /// 用户标识
         /// </summary>
         public string ID
         {
             get; set;
         }
         /// <summary>
         /// 连接的客户
         /// </summary>
         public Socket Client
         {
             get; set;
         }

         /// <summary>
         /// 会话验证码
         /// </summary>
         public int Auth
         {
             get; set;
         }

         public UserToken(int maxBufferSize =  * )
         {
             this.MaxBufferSize = maxBufferSize;
             this.ReceiveBuffer = new byte[this.MaxBufferSize];
         }

         /// <summary>
         /// 处理收取数据
         /// 解包
         /// </summary>
         /// <param name="receiveData"></param>
         /// <param name="action"></param>
         internal void UnPackage(byte[] receiveData, Action<TcpPackage> action)
         {
             //当前包取内容的
             if (offset == )
             {
                 var packageLength = ;
                 if (this._myLenBuffer != null) //长度不完整的（包头不完整的）
                 {
                     //调整receiveData包内容
                     var nData = new byte[this._myLenBuffer.Length + receiveData.Length];
                     Buffer.BlockCopy(this._myLenBuffer, , nData, , this._myLenBuffer.Length);
                     Buffer.BlockCopy(receiveData, , nData, this._myLenBuffer.Length, receiveData.Length);
                     receiveData = nData;
                     nData = null;
                     this._myLenBuffer = null;
                 }
                 else //全新包（包头完整的）
                 {
                     packageLength = TcpPackage.GetLength(receiveData);
                     if (packageLength == )
                         return;
                 }
                 if (packageLength < receiveData.Length)
                 {
                     var package = TcpPackage.Parse(receiveData);
                     if (action != null && package != null)
                     {
                         action(package);
                     }

                     var slen = TcpPackage.GetLength(receiveData, package.Length);
                     if (slen >= )
                     {
                         var next = new byte[receiveData.Length - package.Length];
                         Buffer.BlockCopy(receiveData, package.Length, next, , next.Length);
                         this.UnPackage(next, action);
                     }
                 }
                 else if (packageLength == receiveData.Length)
                 {
                     var package = TcpPackage.Parse(receiveData);
                     if (action != null && package != null)
                     {
                         action(package);
                     }
                 }
                 else if (packageLength > receiveData.Length)
                 {
                     this.count = packageLength;
                     this._myBuffer = new byte[packageLength];
                     Buffer.BlockCopy(receiveData, , this._myBuffer, , receiveData.Length);
                     this.offset = receiveData.Length;
                 }
                 receiveData = null;

             }
             else //跨包取内容的
             {
                 if (receiveData.Length + offset < count) //包内容超出
                 {
                     Buffer.BlockCopy(receiveData, , this._myBuffer, offset, receiveData.Length);
                     offset += receiveData.Length;
                 }
                 else if (receiveData.Length + offset >= count) //包内容短的
                 {
                     var packageLast = count - offset;
                     Buffer.BlockCopy(receiveData, , this._myBuffer, offset, packageLast);
                     var package = TcpPackage.Parse(this._myBuffer);
                     if (action != null && package != null)
                     {
                         action(package);
                     }
                     this._myBuffer = null;
                     count = offset = ;
                     var receiveLast = receiveData.Length - packageLast;
                     if (receiveLast >= )//包含包头长度
                     {
                         var packageLength = TcpPackage.GetLength(receiveData, packageLast);
                         if (packageLength > )
                         {
                             if (receiveLast > packageLength)
                             {
                                 var nextData = new byte[receiveLast];
                                 Buffer.BlockCopy(receiveData, packageLast, nextData, , receiveLast);
                                 this.UnPackage(nextData, action);
                             }
                             else
                             {
                                 this._myBuffer = new byte[packageLength];
                                 Buffer.BlockCopy(receiveData, packageLast, this._myBuffer, , receiveLast);
                                 offset = receiveLast;
                                 count = packageLength;
                             }
                         }
                         else
                         {
                             this._myBuffer = null;
                             count = offset = ;
                             this._myLenBuffer = null;
                         }
                     }
                     else if (receiveLast > )//不包含包头长度
                     {
                         this._myLenBuffer = new byte[receiveLast];
                         Buffer.BlockCopy(receiveData, packageLast, this._myLenBuffer, , receiveLast);
                         if (TcpPackage.GetLength(this._myLenBuffer) == )
                         {
                             this._myLenBuffer = null;
                         }
                         this._myBuffer = null;
                         count = offset = ;
                     }
                 }
                 receiveData = null;
             }
         }

         public byte[] ReceiveBuffer
         {
             get; set;
         }

         public void ClearReceiveBuffer()
         {
             for (int i = ; i < this.ReceiveBuffer.Length; i++)
             {
                 this.ReceiveBuffer[i] = ;
             }
         }
     }
 }

　　有了解包就可以发超长消息、文件等

异步tcp通信——APM.Core 服务端概述

异步tcp通信——APM.Core 解包

异步tcp通信——APM.Server 消息推送服务的实现

异步tcp通信——APM.ConsoleDemo

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