Cowboy 开源 WebSocket 网络库

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2019-05-24 23:01

Cowboy.WebSockets 是一个托管在 GitHub 上的基于 .NET/C# 实现的开源 WebSocket 网络库,其完整的实现了 RFC 6455 (The WebSocket Protocol) 协议标准,并部分实现了 RFC 7692 (Compression Extensions for WebSocket) 协议标准。

WebSocket 可理解为建立在 TCP 连接通道上的更进一步的握手,并确定了消息封装格式。

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通过定义控制帧 (Control Frame) 和数据帧 (Data Frame) 来控制通道内的通信和数据传输,下图用使用 ABNF 格式描述了帧头部的格式。

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Cowboy.WebSockets 中对于 WebSocket 的 Client/Server 分别做了实现,分别对应代码中的:

Cowboy.WebSockets 的内部实现是基于 Cowboy.Sockets 中的 TAP 模式的 AsyncTcpSocketServer 和 AsyncTcpSocketClient 。关于 Cowboy.Sockets 可以参考文章《C#高性能TCP服务的多种实现方式》。

可通过 NuGet 查找 Cowboy 来获取 nuget 包。

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WebSocket 服务端应用

实现 AsyncWebSocketServerModule 抽象类,其中 ModulePath 对应着 "ws://host:port/path" 中的 path 部分。可以实现多个 Module,将多个 Module 注入到 AsyncWebSocketServerModuleCatalog 中,或者采用反射机制等自动发现 Module。

  public class TestWebSocketModule : AsyncWebSocketServerModule
  {
      public TestWebSocketModule()
          : base(@"/test")
      {
      }
  
      public override async Task OnSessionStarted(AsyncWebSocketSession session)
      {
          Console.WriteLine(string.Format("WebSocket session [{0}] has connected.", session.RemoteEndPoint));
          await Task.CompletedTask;
      }
  
      public override async Task OnSessionTextReceived(AsyncWebSocketSession session, string text)
      {
          Console.Write(string.Format("WebSocket session [{0}] received Text --> ", session.RemoteEndPoint));
          Console.WriteLine(string.Format("{0}", text));
  
          await session.SendTextAsync(text);
      }
  
      public override async Task OnSessionBinaryReceived(AsyncWebSocketSession session, byte[] data, int offset, int count)
      {
          var text = Encoding.UTF8.GetString(data, offset, count);
          Console.Write(string.Format("WebSocket session [{0}] received Binary --> ", session.RemoteEndPoint));
          Console.WriteLine(string.Format("{0}", text));
  
          await session.SendBinaryAsync(Encoding.UTF8.GetBytes(text));
      }
  
      public override async Task OnSessionClosed(AsyncWebSocketSession session)
      {
          Console.WriteLine(string.Format("WebSocket session [{0}] has disconnected.", session.RemoteEndPoint));
          await Task.CompletedTask;
      }
  }


实例化 AsyncWebSocketServer,并将 AsyncWebSocketServerModuleCatalog 实例注入,即可启动 WebSocket 的服务端监听。

  class Program
  {
      static AsyncWebSocketServer _server;
  
      static void Main(string[] args)
      {
          NLogLogger.Use();
  
          try
          {
              var catalog = new AsyncWebSocketServerModuleCatalog();
              catalog.RegisterModule(new TestWebSocketModule());
  
              var config = new AsyncWebSocketServerConfiguration();
              //config.SslEnabled = true;
              //config.SslServerCertificate = new System.Security.Cryptography.X509Certificates.X509Certificate2(@"D:\\Cowboy.pfx", "Cowboy");
              //config.SslPolicyErrorsBypassed = true;
  
              _server = new AsyncWebSocketServer(22222, catalog, config);
              _server.Listen();
  
              Console.WriteLine("WebSocket server has been started on [{0}].", _server.ListenedEndPoint);
              Console.WriteLine("Type something to send to clients...");
              while (true)
              {
                  try
                  {
                      string text = Console.ReadLine();
                      if (text == "quit")
                          break;
                      Task.Run(async () =>
                      {
                          //await _server.BroadcastText(text);
                          //Console.WriteLine("WebSocket server [{0}] broadcasts text -> [{1}].", _server.ListenedEndPoint, text);
                          await _server.BroadcastBinaryAsync(Encoding.UTF8.GetBytes(text));
                          Console.WriteLine("WebSocket server [{0}] broadcasts binary -> [{1}].", _server.ListenedEndPoint, text);
                      });
                  }
                  catch (Exception ex)
                  {
                      Console.WriteLine(ex.Message);
                  }
              }
  
              _server.Shutdown();
              Console.WriteLine("WebSocket server has been stopped on [{0}].", _server.ListenedEndPoint);
          }
          catch (Exception ex)
          {
              Logger.Get().Error(ex.Message, ex);
          }
  
          Console.ReadKey();
      }
  }


WebSocket 客户端应用

客户端侧在实例化 AsyncWebSocketClient 时有两种方式:

  1. 实现 IAsyncWebSocketClientMessageDispatcher 接口;
  2. 直接构造函数注入接受各种事件的 Func<> 实现;
  public interface IAsyncWebSocketClientMessageDispatcher
  {
      Task OnServerConnected(AsyncWebSocketClient client);
      Task OnServerTextReceived(AsyncWebSocketClient client, string text);
      Task OnServerBinaryReceived(AsyncWebSocketClient client, byte[] data, int offset, int count);
      Task OnServerDisconnected(AsyncWebSocketClient client);
  
      Task OnServerFragmentationStreamOpened(AsyncWebSocketClient client, byte[] data, int offset, int count);
      Task OnServerFragmentationStreamContinued(AsyncWebSocketClient client, byte[] data, int offset, int count);
      Task OnServerFragmentationStreamClosed(AsyncWebSocketClient client, byte[] data, int offset, int count);
  }


下面的 DEMO 采用了方式二。

  class Program
  {
      static AsyncWebSocketClient _client;
  
      static void Main(string[] args)
      {
          NLogLogger.Use();
  
          Task.Run(async () =>
          {
              try
              {
                  var config = new AsyncWebSocketClientConfiguration();
                  //config.SslTargetHost = "Cowboy";
                  //config.SslClientCertificates.Add(new System.Security.Cryptography.X509Certificates.X509Certificate2(@"D:\\Cowboy.cer"));
                  //config.SslPolicyErrorsBypassed = true;
  
                  //var uri = new Uri("ws://echo.websocket.org/");
                  //var uri = new Uri("wss://127.0.0.1:22222/test");
                  var uri = new Uri("ws://127.0.0.1:22222/test");
                  _client = new AsyncWebSocketClient(uri,
                      OnServerTextReceived,
                      OnServerBinaryReceived,
                      OnServerConnected,
                      OnServerDisconnected,
                      config);
                  await _client.Connect();
  
                  Console.WriteLine("WebSocket client has connected to server [{0}].", uri);
                  Console.WriteLine("Type something to send to server...");
                  while (_client.State == WebSocketState.Open)
                  {
                      try
                      {
                          string text = Console.ReadLine();
                          if (text == "quit")
                              break;
                          Task.Run(async () =>
                          {
                              //await _client.SendText(text);
                              //Console.WriteLine("Client [{0}] send text -> [{1}].", _client.LocalEndPoint, text);
                              await _client.SendBinaryAsync(Encoding.UTF8.GetBytes(text));
                              Console.WriteLine("Client [{0}] send binary -> [{1}].", _client.LocalEndPoint, text);
                          }).Forget();
                      }
                      catch (Exception ex)
                      {
                          Console.WriteLine(ex.Message);
                      }
                  }
  
                  await _client.Close(WebSocketCloseCode.NormalClosure);
                  Console.WriteLine("WebSocket client has disconnected from server [{0}].", uri);
              }
              catch (Exception ex)
              {
                  Logger.Get().Error(ex.Message, ex);
              }
          }).Wait();
  
          Console.ReadKey();
      }
  
      private static async Task OnServerConnected(AsyncWebSocketClient client)
      {
          Console.WriteLine(string.Format("WebSocket server [{0}] has connected.", client.RemoteEndPoint));
          await Task.CompletedTask;
      }
  
      private static async Task OnServerTextReceived(AsyncWebSocketClient client, string text)
      {
          Console.Write(string.Format("WebSocket server [{0}] received Text --> ", client.RemoteEndPoint));
          Console.WriteLine(string.Format("{0}", text));
  
          await Task.CompletedTask;
      }
  
      private static async Task OnServerBinaryReceived(AsyncWebSocketClient client, byte[] data, int offset, int count)
      {
          var text = Encoding.UTF8.GetString(data, offset, count);
          Console.Write(string.Format("WebSocket server [{0}] received Binary --> ", client.RemoteEndPoint));
          Console.WriteLine(string.Format("{0}", text));
  
          await Task.CompletedTask;
      }
  
      private static async Task OnServerDisconnected(AsyncWebSocketClient client)
      {
          Console.WriteLine(string.Format("WebSocket server [{0}] has disconnected.", client.RemoteEndPoint));
          await Task.CompletedTask;
      }
  }


相关资料



作者:匠心十年

原文链接:https://www.cnblogs.com/gaochundong/p/cowboy_websockets.html

本文转自博客园网,版权归原作者所有。

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