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C#编写高性能IOCP网络服务器(源码)

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http://www.cnblogs.com/zhoutk/archive/2012/12/26/2833495.html 最近有项目要做一个高性能网络服务器,决定下功夫搞定完成端口(IOCP),最终花了一个星期终于把它弄清楚了,并用C++写了一个版本,效率很不错。 但,从项目的总体需求来考虑,最终决定上.net平台,因此又花了一天一夜弄出了一个C#版,在这与大家分享。 一些心得体会: 1、在C#中,不用去面对完成端口的操作系统内核对象,Microsoft已经为我们提供了SocketAsyncEventArgs类,它封装了IOCP的使用。请参考:http://msdn.microsoft.com/zh-cn/library/system.net.sockets.socketasynceventargs.aspx?cs-save-lang=1&cs-lang=cpp#code-snippet-1。 2、我的SocketAsyncEventArgsPool类使用List对象来存储对客户端来通信的SocketAsyncEventArgs对象,它相当于直接使用内核对象时的IoContext。我这样设计比用堆栈来实现的好处理是,我可以在SocketAsyncEventArgsPool池中找到任何一个与服务器连接的客户,主动向它发信息。而用堆栈来实现的话,要主动给客户发信息,则还要设计一个结构来存储已连接上服务器的客户。 3、对每一个客户端不管还发送还是接收,我使用同一个SocketAsyncEventArgs对象,对每一个客户端来说,通信是同步进行的,也就是说服务器高度保证同一个客户连接上要么在投递发送请求,并等待;或者是在投递接收请求,等待中。本例只做echo服务器,还未考虑由服务器主动向客户发送信息。 4、SocketAsyncEventArgs的UserToken被直接设定为被接受的客户端Socket。 5、没有使用BufferManager 类,因为我在初始化时给每一个SocketAsyncEventArgsPool中的对象分配一个缓冲区,发送时使用Arrary.Copy来进行字符拷贝,不去改变缓冲区的位置,只改变使用的长度,因此在下次投递接收请求时恢复缓冲区长度就可以了!如果要主动给客户发信息的话,可以new一个SocketAsyncEventArgs对象,或者在初始化中建立几个来专门用于主动发送信息,因为这种需求一般是进行信息群发,建立一个对象可以用于很多次信息发送,总体来看,这种花销不大,还减去了字符拷贝和消耗。 6、测试结果:(在我的笔记本上时行的,我的本本是T420 I7 8G内存) 100客户 100,000(十万次)不间断的发送接收数据(发送和接收之间没有Sleep,就一个一循环,不断的发送与接收)耗时3004.6325 秒完成总共 10,000,000 一千万次访问平均每分完成 199,691.6 次发送与接收平均每秒完成 3,328.2 次发送与接收 整个运行过程中,内存消耗在开始两三分种后就保持稳定不再增涨。 看了一下对每个客户端的延迟最多不超过2毫秒,CPU占用在8%左右。 7、下载地址:http://download.csdn.net/detail/ztk12/4928644 8、源码: 1 using System; 2 using System.Collections.Generic; 3 using System.Text; 4 using System.Net.Sockets; 5 6 namespace IocpServer 7 { 8 /// <summary> 9 /// 与每个客户Socket相关联,进行Send和Receive投递时所需要的参数 10 /// </summary> 11 internal sealed class IoContextPool 12 { 13 List<SocketAsyncEventArgs> pool; //为每一个Socket客户端分配一个SocketAsyncEventArgs,用一个List管理,在程序启动时建立。 14 Int32 capacity; //pool对象池的容量 15 Int32 boundary; //已分配和未分配对象的边界,大的是已经分配的,小的是未分配的 16 17 internal IoContextPool(Int32 capacity) 18 { 19 this.pool = new List<SocketAsyncEventArgs>(capacity); 20 this.boundary = 0; 21 this.capacity = capacity; 22 } 23 24 /// <summary> 25 /// 往pool对象池中增加新建立的对象,因为这个程序在启动时会建立好所有对象, 26 /// 故这个方法只在初始化时会被调用,因此,没有加锁。 27 /// </summary> 28 /// <param name="arg"></param> 29 /// <returns></returns> 30 internal bool Add(SocketAsyncEventArgs arg) 31 { 32 if (arg != null && pool.Count < capacity) 33 { 34 pool.Add(arg); 35 boundary++; 36 return true; 37 } 38 else 39 return false; 40 } 41 42 /// <summary> 43 /// 取出集合中指定对象,内部使用 44 /// </summary> 45 /// <param name="index"></param> 46 /// <returns></returns> 47 //internal SocketAsyncEventArgs Get(int index) 48 //{ 49 // if (index >= 0 && index < capacity) 50 // return pool[index]; 51 // else 52 // return null; 53 //} 54 55 /// <summary> 56 /// 从对象池中取出一个对象,交给一个socket来进行投递请求操作 57 /// </summary> 58 /// <returns></returns> 59 internal SocketAsyncEventArgs Pop() 60 { 61 lock (this.pool) 62 { 63 if (boundary > 0) 64 { 65 --boundary; 66 return pool[boundary]; 67 } 68 else 69 return null; 70 } 71 } 72 73 /// <summary> 74 /// 一个socket客户断开,与其相关的IoContext被释放,重新投入Pool中,备用。 75 /// </summary> 76 /// <param name="arg"></param> 77 /// <returns></returns> 78 internal bool Push(SocketAsyncEventArgs arg) 79 { 80 if (arg != null) 81 { 82 lock (this.pool) 83 { 84 int index = this.pool.IndexOf(arg, boundary); //找出被断开的客户,此处一定能查到,因此index不可能为-1,必定要大于0。 85 if (index == boundary) //正好是边界元素 86 boundary++; 87 else 88 { 89 this.pool[index] = this.pool[boundary]; //将断开客户移到边界上,边界右移 90 this.pool[boundary++] = arg; 91 } 92 } 93 return true; 94 } 95 else 96 return false; 97 } 98 } 99 } 1 using System; 2 using System.Collections.Generic; 3 using System.Text; 4 using System.Net.Sockets; 5 using System.Threading; 6 using System.Net; 7 8 namespace IocpServer 9 { 10 /// <summary> 11 /// 基于SocketAsyncEventArgs 实现 IOCP 服务器 12 /// </summary> 13 internal sealed class IoServer 14 { 15 /// <summary> 16 /// 监听Socket,用于接受客户端的连接请求 17 /// </summary> 18 private Socket listenSocket; 19 20 /// <summary> 21 /// 用于服务器执行的互斥同步对象 22 /// </summary> 23 private static Mutex mutex = new Mutex(); 24 25 /// <summary> 26 /// 用于每个I/O Socket操作的缓冲区大小 27 /// </summary> 28 private Int32 bufferSize; 29 30 /// <summary> 31 /// 服务器上连接的客户端总数 32 /// </summary> 33 private Int32 numConnectedSockets; 34 35 /// <summary> 36 /// 服务器能接受的最大连接数量 37 /// </summary> 38 private Int32 numConnections; 39 40 /// <summary> 41 /// 完成端口上进行投递所用的IoContext对象池 42 /// </summary> 43 private IoContextPool ioContextPool; 44 45 public MainForm mainForm; 46 47 /// <summary> 48 /// 构造函数,建立一个未初始化的服务器实例 49 /// </summary> 50 /// <param name="numConnections">服务器的最大连接数据</param> 51 /// <param name="bufferSize"></param> 52 internal IoServer(Int32 numConnections, Int32 bufferSize) 53 { 54 this.numConnectedSockets = 0; 55 this.numConnections = numConnections; 56 this.bufferSize = bufferSize; 57 58 this.ioContextPool = new IoContextPool(numConnections); 59 60 // 为IoContextPool预分配SocketAsyncEventArgs对象 61 for (Int32 i = 0; i < this.numConnections; i++) 62 { 63 SocketAsyncEventArgs ioContext = new SocketAsyncEventArgs(); 64 ioContext.Completed += new EventHandler<SocketAsyncEventArgs>(OnIOCompleted); 65 ioContext.SetBuffer(new Byte[this.bufferSize], 0, this.bufferSize); 66 67 // 将预分配的对象加入SocketAsyncEventArgs对象池中 68 this.ioContextPool.Add(ioContext); 69 } 70 } 71 72 /// <summary> 73 /// 当Socket上的发送或接收请求被完成时,调用此函数 74 /// </summary> 75 /// <param name="sender">激发事件的对象</param> 76 /// <param name="e">与发送或接收完成操作相关联的SocketAsyncEventArg对象</param> 77 private void OnIOCompleted(object sender, SocketAsyncEventArgs e) 78 { 79 // Determine which type of operation just completed and call the associated handler. 80 switch (e.LastOperation) 81 { 82 case SocketAsyncOperation.Receive: 83 this.ProcessReceive(e); 84 break; 85 case SocketAsyncOperation.Send: 86 this.ProcessSend(e); 87 break; 88 default: 89 throw new ArgumentException("The last operation completed on the socket was not a receive or send"); 90 } 91 } 92 93 /// <summary> 94 ///接收完成时处理函数 95 /// </summary> 96 /// <param name="e">与接收完成操作相关联的SocketAsyncEventArg对象</param> 97 private void ProcessReceive(SocketAsyncEventArgs e) 98 { 99 // 检查远程主机是否关闭连接 100 if (e.BytesTransferred > 0) 101 { 102 if (e.SocketError == SocketError.Success) 103 { 104 Socket s = (Socket)e.UserToken; 105 //判断所有需接收的数据是否已经完成 106 if (s.Available == 0) 107 { 108 // 设置发送数据 109 Array.Copy(e.Buffer, 0, e.Buffer, e.BytesTransferred, e.BytesTransferred); 110 e.SetBuffer(e.Offset, e.BytesTransferred * 2); 111 if (!s.SendAsync(e)) //投递发送请求,这个函数有可能同步发送出去,这时返回false,并且不会引发SocketAsyncEventArgs.Completed事件 112 { 113 // 同步发送时处理发送完成事件 114 this.ProcessSend(e); 115 } 116 } 117 else if (!s.ReceiveAsync(e)) //为接收下一段数据,投递接收请求,这个函数有可能同步完成,这时返回false,并且不会引发SocketAsyncEventArgs.Completed事件 118 { 119 // 同步接收时处理接收完成事件 120 this.ProcessReceive(e); 121 } 122 } 123 else 124 { 125 this.ProcessError(e); 126 } 127 } 128 else 129 { 130 this.CloseClientSocket(e); 131 } 132 } 133 134 /// <summary> 135 /// 发送完成时处理函数 136 /// </summary> 137 /// <param name="e">与发送完成操作相关联的SocketAsyncEventArg对象</param> 138 private void ProcessSend(SocketAsyncEventArgs e) 139 { 140 if (e.SocketError == SocketError.Success) 141 { 142 Socket s = (Socket)e.UserToken; 143 144 //接收时根据接收的字节数收缩了缓冲区的大小,因此投递接收请求时,恢复缓冲区大小 145 e.SetBuffer(0, bufferSize); 146 if (!s.ReceiveAsync(e)) //投递接收请求 147 { 148 // 同步接收时处理接收完成事件 149 this.ProcessReceive(e); 150 } 151 } 152 else 153 { 154 this.ProcessError(e); 155 } 156 } 157 158 /// <summary> 159 /// 处理socket错误 160 /// </summary> 161 /// <param name="e"></param> 162 private void ProcessError(SocketAsyncEventArgs e) 163 { 164 Socket s = e.UserToken as Socket; 165 IPEndPoint localEp = s.LocalEndPoint as IPEndPoint; 166 167 this.CloseClientSocket(s, e); 168 169 string outStr = String.Format("套接字错误 {0}, IP {1}, 操作 {2}。", (Int32)e.SocketError, localEp, e.LastOperation); 170 mainForm.Invoke(mainForm.setlistboxcallback, outStr); 171 //Console.WriteLine("Socket error {0} on endpoint {1} during {2}.", (Int32)e.SocketError, localEp, e.LastOperation); 172 } 173 174 /// <summary> 175 /// 关闭socket连接 176 /// </summary> 177 /// <param name="e">SocketAsyncEventArg associated with the completed send/receive operation.</param> 178 private void CloseClientSocket(SocketAsyncEventArgs e) 179 { 180 Socket s = e.UserToken as Socket; 181 this.CloseClientSocket(s, e); 182 } 183 184 private void CloseClientSocket(Socket s, SocketAsyncEventArgs e) 185 { 186 Interlocked.Decrement(ref this.numConnectedSockets); 187 188 // SocketAsyncEventArg 对象被释放,压入可重用队列。 189 this.ioContextPool.Push(e); 190 string outStr = String.Format("客户 {0} 断开, 共有 {1} 个连接。", s.RemoteEndPoint.ToString(), this.numConnectedSockets); 191 mainForm.Invoke(mainForm.setlistboxcallback, outStr); 192 //Console.WriteLine("A client has been disconnected from the server. There are {0} clients connected to the server", this.numConnectedSockets); 193 try 194 { 195 s.Shutdown(SocketShutdown.Send); 196 } 197 catch (Exception) 198 { 199 // Throw if client has closed, so it is not necessary to catch. 200 } 201 finally 202 { 203 s.Close(); 204 } 205 } 206 207 /// <summary> 208 /// accept 操作完成时回调函数 209 /// </summary> 210 /// <param name="sender">Object who raised the event.</param> 211 /// <param name="e">SocketAsyncEventArg associated with the completed accept operation.</param> 212 private void OnAcceptCompleted(object sender, SocketAsyncEventArgs e) 213 { 214 this.ProcessAccept(e); 215 } 216 217 /// <summary> 218 /// 监听Socket接受处理 219 /// </summary> 220 /// <param name="e">SocketAsyncEventArg associated with the completed accept operation.</param> 221 private void ProcessAccept(SocketAsyncEventArgs e) 222 { 223 Socket s = e.AcceptSocket; 224 if (s.Connected) 225 { 226 try 227 { 228 SocketAsyncEventArgs ioContext = this.ioContextPool.Pop(); 229 if (ioContext != null) 230 { 231 // 从接受的客户端连接中取数据配置ioContext 232 233 ioContext.UserToken = s; 234 235 Interlocked.Increment(ref this.numConnectedSockets); 236 string outStr = String.Format("客户 {0} 连入, 共有 {1} 个连接。", s.RemoteEndPoint.ToString(),this.numConnectedSockets); 237 mainForm.Invoke(mainForm.setlistboxcallback,outStr); 238 //Console.WriteLine("Client connection accepted. There are {0} clients connected to the server", 239 //this.numConnectedSockets); 240 241 if (!s.ReceiveAsync(ioContext)) 242 { 243 this.ProcessReceive(ioContext); 244 } 245 } 246 else //已经达到最大客户连接数量,在这接受连接,发送“连接已经达到最大数”,然后断开连接 247 { 248 s.Send(Encoding.Default.GetBytes("连接已经达到最大数!")); 249 string outStr = String.Format("连接已满,拒绝 {0} 的连接。", s.RemoteEndPoint); 250 mainForm.Invoke(mainForm.setlistboxcallback, outStr); 251 s.Close(); 252 } 253 } 254 catch (SocketException ex) 255 { 256 Socket token = e.UserToken as Socket; 257 string outStr = String.Format("接收客户 {0} 数据出错, 异常信息: {1} 。", token.RemoteEndPoint, ex.ToString()); 258 mainForm.Invoke(mainForm.setlistboxcallback, outStr); 259 //Console.WriteLine("Error when processing data received from {0}:\r\n{1}", token.RemoteEndPoint, ex.ToString()); 260 } 261 catch (Exception ex) 262 { 263 mainForm.Invoke(mainForm.setlistboxcallback, "异常:" + ex.ToString()); 264 } 265 // 投递下一个接受请求 266 this.StartAccept(e); 267 } 268 } 269 270 /// <summary> 271 /// 从客户端开始接受一个连接操作 272 /// </summary> 273 /// <param name="acceptEventArg">The context object to use when issuing 274 /// the accept operation on the server's listening socket.</param> 275 private void StartAccept(SocketAsyncEventArgs acceptEventArg) 276 { 277 if (acceptEventArg == null) 278 { 279 acceptEventArg = new SocketAsyncEventArgs(); 280 acceptEventArg.Completed += new EventHandler<SocketAsyncEventArgs>(OnAcceptCompleted); 281 } 282 else 283 { 284 // 重用前进行对象清理 285 acceptEventArg.AcceptSocket = null; 286 } 287 288 if (!this.listenSocket.AcceptAsync(acceptEventArg)) 289 { 290 this.ProcessAccept(acceptEventArg); 291 } 292 } 293 294 /// <summary> 295 /// 启动服务,开始监听 296 /// </summary> 297 /// <param name="port">Port where the server will listen for connection requests.</param> 298 internal void Start(Int32 port) 299 { 300 // 获得主机相关信息 301 IPAddress[] addressList = Dns.GetHostEntry(Environment.MachineName).AddressList; 302 IPEndPoint localEndPoint = new IPEndPoint(addressList[addressList.Length - 1], port); 303 304 // 创建监听socket 305 this.listenSocket = new Socket(localEndPoint.AddressFamily, SocketType.Stream, ProtocolType.Tcp); 306 this.listenSocket.ReceiveBufferSize = this.bufferSize; 307 this.listenSocket.SendBufferSize = this.bufferSize; 308 309 if (localEndPoint.AddressFamily == AddressFamily.InterNetworkV6) 310 { 311 // 配置监听socket为 dual-mode (IPv4 & IPv6) 312 // 27 is equivalent to IPV6_V6ONLY socket option in the winsock snippet below, 313 this.listenSocket.SetSocketOption(SocketOptionLevel.IPv6, (SocketOptionName)27, false); 314 this.listenSocket.Bind(new IPEndPoint(IPAddress.IPv6Any, localEndPoint.Port)); 315 } 316 else 317 { 318 this.listenSocket.Bind(localEndPoint); 319 } 320 321 // 开始监听 322 this.listenSocket.Listen(this.numConnections); 323 324 // 在监听Socket上投递一个接受请求。 325 this.StartAccept(null); 326 327 // Blocks the current thread to receive incoming messages. 328 mutex.WaitOne(); 329 } 330 331 /// <summary> 332 /// 停止服务 333 /// </summary> 334 internal void Stop() 335 { 336 this.listenSocket.Close(); 337 mutex.ReleaseMutex(); 338 } 339 340 } 341 } .