如何在ASP.NET Core RC2中制作Websocket服務器？

Question

我使用“ Microsoft.AspNetCore.WebSockets.Server”：“ 0.1.0-rc2-final”制作了一個websocket服務器，但是不起作用。 （在rc1中，它是1.0.0-rc1-final，它可以正常工作...）

這是我的代碼：

    public void Configure(IApplicationBuilder app, IHostingEnvironment env, ILoggerFactory loggerFactory)
    {
        loggerFactory.AddConsole(Configuration.GetSection("Logging"));
        loggerFactory.AddDebug();

        app.UseWebSockets();

        app.Use(async (http, next) =>
        {

            if (http.WebSockets.IsWebSocketRequest)
            {
                IHandler handler = WebsocketManager.getHandler(http.Request.Path);
                if (handler == null)
                {
                    await next();
                }
                else
                {
                    var webSocket = await http.WebSockets.AcceptWebSocketAsync();
                    if (webSocket != null && webSocket.State == WebSocketState.Open)
                    {
                        // TODO: Handle the socket here.
                        WebsocketManager.Handle(webSocket, handler);
                    }
                }
            }
            else
            {
                // Nothing to do here, pass downstream.  
                await next();
            }
        });


        app.UseMvc();
    }

WebsocketManager是我自己的經理類。 這是我處理websocket會話的方式：

    public async Task Listen()
    {
        OnOpen();
        while (_webSocket.State == WebSocketState.Open)
        {
            var error = String.Empty;

            try
            {
                var buffer = new ArraySegment<Byte>(new Byte[4096]);
                var received = await _webSocket.ReceiveAsync(buffer, CancellationToken.None);

                switch (received.MessageType)
                {
                    case WebSocketMessageType.Close:
                        OnClose(received.CloseStatus, received.CloseStatusDescription);
                        break;
                    case WebSocketMessageType.Text:
                        var data = Encoding.UTF8.GetString(buffer.Array, buffer.Offset, buffer.Count).Trim('\0');
                        OnMessage(data);
                        break;
                    case WebSocketMessageType.Binary:
                        OnMessage(buffer.Array);
                        break;
                }
            }
            catch (Exception ex)
            {
                Console.WriteLine(ex);
                break;
            }
        }
    }

然后，“ _ webSocket.ReceiveAsync”引發異常“請求已中止”。

我確定客戶端不會關閉會話。

如何解決？

Answer 1

您需要await以下行： WebsocketManager.Handle(webSocket, handler); 否則，請求結束並且資源被處置。