OWINを使用したWebSocket

Question

これまでに私が見たweb-api上のMicrosoft WebSocketsを使用するすべての例は、IISを使用しています。実装はgetメソッドにあります.HTTP接続はwebsocketにアップグレードされ、websocketハンドラのインスタンスが渡されます。 HTTPContextへ

public HttpResponseMessage Get() { 
    if (HttpContext.Current.IsWebSocketRequest) { 
    var noteHandler = new NoteSocketHandler(); 
    HttpContext.Current.AcceptWebSocketRequest(noteHandler); 
    } 
    return new HttpResponseMessage(HttpStatusCode.SwitchingProtocols); 
} 

OWINパイプラインで同じことを達成しようとしています。問題は、接続がWebSocketを使用するようにアップグレードされているが、WebSocketハンドラを使用していないことです。どこが間違っていますか？提案してください。

OwinContextを利用コントローラー（例WebSockets in Nancy using OWINに続く）、

public HttpResponseMessage Get() { 
    IOwinContext owinContext = Request.GetOwinContext(); 

    WebSocketAccept acceptToken = owinContext.Get<WebSocketAccept>("websocket.Accept"); 
    if (acceptToken != null) { 
     var requestHeaders = GetValue<IDictionary<string, string[]>>(owinContext.Environment, "owin.RequestHeaders"); 

     Dictionary<string, object> acceptOptions = null; 
     string[] subProtocols; 
     if (requestHeaders.TryGetValue("Sec-WebSocket-Protocol", out subProtocols) && subProtocols.Length > 0) { 
     acceptOptions = new Dictionary<string, object>(); 
     // Select the first one from the client 
     acceptOptions.Add("websocket.SubProtocol", subProtocols[0].Split(',').First().Trim()); 
     } 

     acceptToken(acceptOptions, async wsEnv => { 
     var wsSendAsync = (WebSocketSendAsync)wsEnv["websocket.SendAsync"]; 
     var wsRecieveAsync = (WebSocketReceiveAsync)wsEnv["websocket.ReceiveAsync"]; 
     var wsCloseAsync = (WebSocketCloseAsync)wsEnv["websocket.CloseAsync"]; 
     var wsCallCancelled = (CancellationToken)wsEnv["websocket.CallCancelled"]; 

     //should I pass the handler to an event? 
     var handler = new NoteSocketHAndler();    
     }); 

    } else { 
     return new HttpResponseMessage(HttpStatusCode.BadRequest); 
    } 
    return new HttpResponseMessage(HttpStatusCode.SwitchingProtocols); 
} 

ハンドラコード：

using System; 
using Socket = Microsoft.Web.WebSockets; 
using Newtonsoft.Json; 

public class NoteSocketHandler : Socket.WebSocketHandler { 
    private static Socket.WebSocketCollection connections = new Socket.WebSocketCollection(); 

    public NoteSocketHandler() { 
    } 

    public override void OnOpen() { 
     connections.Add(this); 
    } 

    public override void OnClose() { 
     connections.Remove(this); 
    } 

    public override void OnMessage(string message) { 
     ChatMessage chatMessage = JsonConvert.DeserializeObject<ChatMessage>(message); 
     foreach (var connection in connections) { 
     connection.Send(message); 
     } 
    } 
} 

Answer 1

私は最終的に問題を解決する方法を考え出しました。以下のコードを見つけることができます。また、websockets on OWINを使用する基本的なアプリを書いています。

using System.Collections.Generic; 
using System.Linq; 
using System.Net; 
using System.Net.Http; 
using System.Web.Http; 
using Microsoft.Owin; 

namespace NoteApp.WebService.Controller { 
    using System; 
    using System.Net.WebSockets; 
    using System.Text; 
    using System.Threading; 
    using System.Threading.Tasks; 
    using NoteApp.WebService.Handler; 
    using WebSocketAccept = System.Action< 
           System.Collections.Generic.IDictionary<string, object>, // WebSocket Accept parameters 
           System.Func< // WebSocketFunc callback 
            System.Collections.Generic.IDictionary<string, object>, // WebSocket environment 
            System.Threading.Tasks.Task>>; 
    using WebSocketCloseAsync = System.Func< 
            int, // closeStatus 
            string, // closeDescription 
            System.Threading.CancellationToken, // cancel 
            System.Threading.Tasks.Task>; 
    using WebSocketReceiveAsync = System.Func< 
        System.ArraySegment<byte>, // data 
        System.Threading.CancellationToken, // cancel 
        System.Threading.Tasks.Task< 
         System.Tuple< // WebSocketReceiveTuple 
          int, // messageType 
          bool, // endOfMessage 
          int>>>; // count 
    // closeStatusDescription 
    using WebSocketReceiveResult = System.Tuple<int, bool, int>; 
    using WebSocketSendAsync = System.Func< 
             System.ArraySegment<byte>, // data 
             int, // message type 
             bool, // end of message 
             System.Threading.CancellationToken, // cancel 
             System.Threading.Tasks.Task>; 

    public class NoteController : ApiController { 
     public HttpResponseMessage Get() { 
     IOwinContext owinContext = Request.GetOwinContext(); 

     WebSocketAccept acceptToken = owinContext.Get<WebSocketAccept>("websocket.Accept"); 
     if (acceptToken != null) { 
      var requestHeaders = GetValue<IDictionary<string, string[]>>(owinContext.Environment, "owin.RequestHeaders"); 

      Dictionary<string, object> acceptOptions = null; 
      string[] subProtocols; 
      if (requestHeaders.TryGetValue("Sec-WebSocket-Protocol", out subProtocols) && subProtocols.Length > 0) { 
       acceptOptions = new Dictionary<string, object>(); 
       // Select the first one from the client 
       acceptOptions.Add("websocket.SubProtocol", subProtocols[0].Split(',').First().Trim()); 
      } 
      acceptToken(acceptOptions, ProcessSocketConnection); 


     } else { 
      return new HttpResponseMessage(HttpStatusCode.BadRequest); 
     } 
     return new HttpResponseMessage(HttpStatusCode.SwitchingProtocols); 
     } 

     private async Task ProcessSocketConnection(IDictionary<string, object> wsEnv) { 
     var wsSendAsync = (WebSocketSendAsync)wsEnv["websocket.SendAsync"]; 
     var wsCloseAsync = (WebSocketCloseAsync)wsEnv["websocket.CloseAsync"]; 
     var wsCallCancelled = (CancellationToken)wsEnv["websocket.CallCancelled"]; 
     var wsRecieveAsync = (WebSocketReceiveAsync)wsEnv["websocket.ReceiveAsync"]; 

     //pass the sendasync tuple and the cancellation token to the handler. The handler uses the sendasync method to send message. Each connected client has access to this 
     var handler = new NoteSocketHandler(wsSendAsync, CancellationToken.None); 
     handler.OnOpen(); 
     var buffer = new ArraySegment<byte>(new byte[100]); 
     try { 
      object status; 
      while (!wsEnv.TryGetValue("websocket.ClientCloseStatus", out status) || (int)status == 0) { 
       WebSocketReceiveResult webSocketResultTuple = await wsRecieveAsync(buffer, CancellationToken.None);     
       int count = webSocketResultTuple.Item3; 

       handler.OnMessage(Encoding.UTF8.GetString(buffer.Array, 0, count)); 
      } 
     } catch (Exception ex) { 
      Console.WriteLine(ex.Message); 
      throw ex; 
     } 
     handler.OnClose(); 
     await wsCloseAsync((int)WebSocketCloseStatus.NormalClosure, "Closing", CancellationToken.None); 
     } 

     T GetValue<T>(IDictionary<string, object> env, string key) { 
     object value; 
     return env.TryGetValue(key, out value) && value is T ? (T)value : default(T); 
     } 


    } 
}