C#高性能大容量SOCKET并发(十一):编写上传客户端
客户端封装整体框架
客户端编程基于阻塞同步模式,只有数据正常发送或接收才返回,如果发生错误则抛出异常,基于TcpClient进行封装,主要类结构如下图:
TcpClient:NET系统封装,实现了底层Socket操作,提供了阻塞和非阻塞调用;
OutgoingDataAssembler m_outgoingDataAssembler:协议组装器,用来组装往外发送的命令,主要用于组装协议格式;
DynamicBufferManager m_sendBuffer:用于把命令和数据同时写入到缓存中,调用一次发送,这样服务器就只会产生一次IOCP回调,可以提高性能;
IncomingDataParser m_incomingDataParser:收到数据的解析器,用于解析返回的内容,主要是解析文本格式;
protected DynamicBufferManager m_recvBuffer:接收数据的缓存,数据存到缓存中后,可以解析命令和数据;
TcpClient说明,阻塞和非阻塞
TcpClient封装了NET的底层Socket操作,基于TCP协议,提供了阻塞和非阻塞模式调用,具体是设置m_tcpClient.Client.Blocking = true表示使用阻塞模式,反之则使用非阻塞模式。阻塞模式表示接收完指定长度的数据才返回,非阻塞模式表示收到一点数据就返回。
如我们调用m_tcpClient.Client.Receive(m_recvBuffer.Buffer, sizeof(int), packetLength, SocketFlags.None),假设传入的长度为1024,阻塞模式一点要等到数据达到1024长度才返回,否则一直等待Socket超时或者链路断了,非阻塞模式则不同,加入收到8字节了,则返回调用者,调用者使用循环继续接受1024-8=1016的数据。
发送命令
发送数据和服务端相同,主要是对数据进行组包,然后调用发送函数发送,具体代码如下:
- public void SendCommand(byte[] buffer, int offset, int count)
- {
- string commandText = m_outgoingDataAssembler.GetProtocolText();
- byte[] bufferUTF8 = Encoding.UTF8.GetBytes(commandText);
- int totalLength = sizeof(int) + bufferUTF8.Length + count; //获取总大小
- m_sendBuffer.Clear();
- m_sendBuffer.WriteInt(totalLength, false); //写入总大小
- m_sendBuffer.WriteInt(bufferUTF8.Length, false); //写入命令大小
- m_sendBuffer.WriteBuffer(bufferUTF8); //写入命令内容
- m_sendBuffer.WriteBuffer(buffer, offset, count); //写入二进制数据
- m_tcpClient.Client.Send(m_sendBuffer.Buffer, 0, m_sendBuffer.DataCount, SocketFlags.None);
- }
接收命令
接收命令和发送相反,先接收长度,然后接收内容,然后对数据进行解包,具体代码如下:
- public bool RecvCommand(out byte[] buffer, out int offset, out int size)
- {
- m_recvBuffer.Clear();
- m_tcpClient.Client.Receive(m_recvBuffer.Buffer, sizeof(int), SocketFlags.None);
- int packetLength = BitConverter.ToInt32(m_recvBuffer.Buffer, 0); //获取包长度
- if (NetByteOrder)
- packetLength = System.Net.IPAddress.NetworkToHostOrder(packetLength); //把网络字节顺序转为本地字节顺序
- m_recvBuffer.SetBufferSize(sizeof(int) + packetLength); //保证接收有足够的空间
- m_tcpClient.Client.Receive(m_recvBuffer.Buffer, sizeof(int), packetLength, SocketFlags.None);
- int commandLen = BitConverter.ToInt32(m_recvBuffer.Buffer, sizeof(int)); //取出命令长度
- string tmpStr = Encoding.UTF8.GetString(m_recvBuffer.Buffer, sizeof(int) + sizeof(int), commandLen);
- if (!m_incomingDataParser.DecodeProtocolText(tmpStr)) //解析命令
- {
- buffer = null;
- offset = 0;
- size = 0;
- return false;
- }
- else
- {
- buffer = m_recvBuffer.Buffer;
- offset = commandLen + sizeof(int) + sizeof(int);
- size = packetLength - offset;
- return true;
- }
- }
命令交互
封装了底层Socket操作和协议解析后,实现一个命令交互如登录代码如下:
- public bool DoLogin(string userName, string password)
- {
- try
- {
- m_outgoingDataAssembler.Clear();
- m_outgoingDataAssembler.AddRequest();
- m_outgoingDataAssembler.AddCommand(AsyncSocketServer.ProtocolKey.Login);
- m_outgoingDataAssembler.AddValue(AsyncSocketServer.ProtocolKey.UserName, userName);
- m_outgoingDataAssembler.AddValue(AsyncSocketServer.ProtocolKey.Password, AsyncSocketServer.BasicFunc.MD5String(password));
- SendCommand();
- bool bSuccess = RecvCommand();
- if (bSuccess)
- {
- bSuccess = CheckErrorCode();
- if (bSuccess)
- {
- m_userName = userName;
- m_password = password;
- }
- return bSuccess;
- }
- else
- return false;
- }
- catch (Exception E)
- {
- //记录日志
- m_errorString = E.Message;
- return false;
- }
- }
上传协议
上传协议主要分为三个命令,第一个是Upload,向服务器请求上传的文件,如果服务器有相同的文件,则返回是否传完,如果未传完,返回需要续传的文件位置,然后客户端则从上一个位置开始传输,传输数据服务器只接收,不应答,客户端传输完后,发完成(EOF)命令。因此三个命令封装代码如下:
调用过程:
- public bool DoUpload(string dirName, string fileName, ref long fileSize)
- {
- bool bConnect = ReConnectAndLogin(); //检测连接是否还在,如果断开则重连并登录
- if (!bConnect)
- return bConnect;
- try
- {
- m_outgoingDataAssembler.Clear();
- m_outgoingDataAssembler.AddRequest();
- m_outgoingDataAssembler.AddCommand(AsyncSocketServer.ProtocolKey.Upload);
- m_outgoingDataAssembler.AddValue(AsyncSocketServer.ProtocolKey.DirName, dirName);
- m_outgoingDataAssembler.AddValue(AsyncSocketServer.ProtocolKey.FileName, fileName);
- SendCommand();
- bool bSuccess = RecvCommand();
- if (bSuccess)
- {
- bSuccess = CheckErrorCode();
- if (bSuccess)
- {
- bSuccess = m_incomingDataParser.GetValue(AsyncSocketServer.ProtocolKey.FileSize, ref fileSize);
- }
- return bSuccess;
- }
- else
- return false;
- }
- catch (Exception E)
- {
- //记录日志
- m_errorString = E.Message;
- return false;
- }
- }
- public bool DoData(byte[] buffer, int offset, int count)
- {
- try
- {
- m_outgoingDataAssembler.Clear();
- m_outgoingDataAssembler.AddRequest();
- m_outgoingDataAssembler.AddCommand(AsyncSocketServer.ProtocolKey.Data);
- SendCommand(buffer, offset, count);
- return true;
- }
- catch (Exception E)
- {
- //记录日志
- m_errorString = E.Message;
- return false;
- }
- }
- public bool DoEof(Int64 fileSize)
- {
- try
- {
- m_outgoingDataAssembler.Clear();
- m_outgoingDataAssembler.AddRequest();
- m_outgoingDataAssembler.AddCommand(AsyncSocketServer.ProtocolKey.Eof);
- SendCommand();
- bool bSuccess = RecvCommand();
- if (bSuccess)
- return CheckErrorCode();
- else
- return false;
- }
- catch (Exception E)
- {
- //记录日志
- m_errorString = E.Message;
- return false;
- }
- }
- protected static bool SendFile(string fileName, ClientUploadSocket uploadSocket)
- {
- FileStream fileStream = new FileStream(fileName, FileMode.Open, FileAccess.ReadWrite);
- try
- {
- try
- {
- long fileSize = 0;
- if (!uploadSocket.DoUpload("", Path.GetFileName(fileName), ref fileSize))
- throw new Exception(uploadSocket.ErrorString);
- fileStream.Position = fileSize;
- byte[] readBuffer = new byte[PacketSize];
- while (fileStream.Position < fileStream.Length)
- {
- int count = fileStream.Read(readBuffer, 0, PacketSize);
- if (!uploadSocket.DoData(readBuffer, 0, count))
- throw new Exception(uploadSocket.ErrorString);
- }
- if (!uploadSocket.DoEof(fileStream.Length))
- throw new Exception(uploadSocket.ErrorString);
- return true;
- }
- catch (Exception E)
- {
- Console.WriteLine("Upload File Error: " + E.Message);
- return false;
- }
- }
- finally
- {
- fileStream.Close();
- }
- }
DEMO下载地址:http://download.csdn.net/detail/sqldebug_fan/7467745
免责声明:此代码只是为了演示C#完成端口编程,仅用于学习和研究,切勿用于商业用途。水平有限,C#也属于初学,错误在所难免,欢迎指正和指导。邮箱地址:fansheng_hx@163.com。
http://blog.csdn.net/sqldebug_fan/article/details/29391551