Question

我正在尝试使用远程请求更改服务器的端口。当我这样做时，似乎一切正常，但当我尝试连接时，我得到一个例外。

如果我关闭（终止进程）然后打开（启动进程）具有新端口的服务器一切正常（客户端设法连接）。

服务器

internal class Program
{
    private static IDisposable _webApp = null;
    static void Main(string[] args)
    {
        var uri = Start(8089);
        Stop();
        var uri = Start(8089);
        Console.WriteLine("Press enter to exit");
        Console.ReadLine();
    }

    private static string Start(int port)
    {
        var options = new StartOptions();
        var uri = string.Format("http://*:{0}/", port);
        options.Urls.Add(uri);
        options.Settings.Add(typeof(ITraceOutputFactory).FullName, typeof(NullTraceOutputFactory).AssemblyQualifiedName);// disable built-in owin tracing by using a null traceoutput
        var startup = new Startup
            {
                Restart = Restart
            };
        _webApp = WebApp.Start(options, startup.Configuration);
        Trace.Listeners.Remove("HostingTraceListener"); // remove the built-in owin listener
        Console.WriteLine("Server running at " + uri);
        return uri;
    }

    private static void Stop()
    {
        _webApp.Dispose();
    }

    private static string Restart(int port)
    {
        Stop();
        var uri = Start(port);
        return uri;
    }

    internal class NullTraceOutputFactory : ITraceOutputFactory
    {
        public TextWriter Create(string outputFile)
        {
            return StreamWriter.Null;
        }
    }
}

[HubName("Configuration")]
public class ConfigurationHub : Hub
{
    private Func<int, string> _restart;

    public ConfigurationHub(Func<int, string> restart)
    {
        _restart = restart;
    }

    public void ChangePort(int port)
    {
        Console.WriteLine("Port: " + port);
        _restart(port);
    }
}

internal class Startup
{
    public Func<int, string> Restart;

    public void Configuration(IAppBuilder app)
    {
        GlobalHost.DependencyResolver.Register(typeof(ConfigurationHub),
                () => new ConfigurationHub(Restart));
        app.UseCors(CorsOptions.AllowAll);
        //app.UseWelcomePage();
        var hubConfiguration = new HubConfiguration
        {
            EnableJSONP = true,
#if DEBUG
            EnableDetailedErrors = true
#endif
        };

        app.MapSignalR(hubConfiguration);
    }
}

客户端：

public partial class Form1 : Form
{
    private IHubProxy _configurationProxy = null;
    private HubConnection _hubConnection;
    private const string CATEGORY = "ABCD";

    public Form1()
    {
        InitializeComponent();
        CreateProxy(8089);
        _hubConnection.Start().Wait();
    }

    private void btnChangePort_Click(object sender, EventArgs e)
    {
        var newPort = Int32.Parse(btnChangePort.Tag as string);
        _configurationProxy.Invoke("ChangePort", newPort);
        _hubConnection.Stop();
        _hubConnection.Dispose();
        _hubConnection = null;
        CreateProxy(newPort);
        _hubConnection.Start().Wait(); // <= Exception when clicking the button
    }

    private void CreateProxy(int newPort)
    {
        //var address = "127.0.0.1";
        var address = "192.168.0.100";
        var port = newPort;
        var config =
            new
                {
                    Name = "Configuration",
                    Pattern = "http://{0}:{1}",
                    Address = address,
                    Port = newPort,
                    QueryString = new Dictionary<string, string> { { "version", "1.0" } },
                    Methods = new[]
                        {
                            "notifyWrongVersion",
#if ERROR
                                "notifyConnected",
#endif
                            //"status",
                            "notifyByeBye"
                        },
                    MethodsCallbacks = new Action[]
                        {
                            () => Console.WriteLine("{0}: You are using the wrong version!", CATEGORY),
#if ERROR
                                    () => Trace.WriteLine("Connected to server! HOORAY!", Categories.CATEGORY_THIS),
#endif
                            () =>
                            Console.WriteLine("{0}: Bye bye from the server. Thank you for discnnecting.", CATEGORY)
                        },
                };

        var url = String.Format(config.Pattern, config.Address, config.Port);

        _hubConnection = new HubConnection(url);
        _hubConnection.TraceLevel = TraceLevels.All;
        _hubConnection.TraceWriter = Console.Out;
        _configurationProxy = _hubConnection.CreateHubProxy(config.Name);
    }
}

异常： Exception

情境：
在客户端和服务器上启动端口8089 按下客户端和服务器上的按钮更改为8088
关闭客户端
用端口8088打开客户端。

客户端记录：

14：04：18.2450308 - null - ChangeState（断开连接，连接） 14：04：18.7762877 - 708038b9-66b0-4cc2-95ac-de45411e453c - WS 连接到： WS：//192.168.250.9：8088 / signalr /连接clientProtocol = 1.4＆安培;运输=的WebSockets＆安培; connectionData = [{ “名称”： “配置”}]＆安培; connectionToken = AQAAANCMnd8BFdERjHoAwE％2FCl％2BsBAAAAVaJK6bsSpkyFVlk1Ej463gAAAAACAAAAAAADZgAAwAAAABAAAAAcSxXM3loQOfD31c8mYLdqAAAAAASAAACgAAAAEAAAAISDmfaiIg％2BY％2FVt3bBI％ 2BZkAoAAAAd％2FngqVkiFGH55BN9NOW4nljYZzHBBwoTLxNwrj％2B31AiShmmgS6euMBQAAADjFYeiwsjjJ％2BRVX92GYdozAkKthw％3D％3D 14：04：23.8220044 - 708038b9-66b0-4cc2-95ac-de45411e453c - 自动：失败连接到使用传输webSockets。 System.TimeoutException：运输超时试图连接14：04：23.8220044 - 708038b9-66b0-4cc2-95ac-de45411e453c - SSE：GET http://192.168.250.9:8088/signalr/connect?clientProtocol=1.4&transport=serverSentEvents&connectionData=[ { “名称”： “配置”}]＆安培; connectionToken = AQAAANCMnd8BFdERjHoAwE％2FCl％2BsBAAAAVaJK6bsSpkyFVlk1Ej463gAAAAACAAAAAAADZgAAwAAAABAAAAAcSxXM3loQOfD31c8mYLdqAAAAAASAAACgAAAAEAAAAISDmfaiIg％2BY％2FVt3bBI％2BZkAoAAAAd％2FngqVkiFGH55BN9NOW4nljYZzHBBwoTLxNwrj％2B31AiShmmgS6euMBQAAADjFYeiwsjjJ％2BRVX92GYdozAkKthw％3D％3D 14：04：23.9157549 - 708038b9-66b0-4cc2-95ac-de45411e453c - WS： OnClose（）14：04：23.9157549 - 708038b9-66b0-4cc2-95ac-de45411e453c - SSE：OnMessage（数据：已初始化）14：04：28.8486354 - 708038b9-66b0-4cc2-95ac-de45411e453c - 自动：无法连接到使用传输serverSentEvents。 System.TimeoutException：传输试图连接时间超时14：04：28.8642594 - 708038b9-66b0-4cc2-95ac-de45411e453c - LP Connect： http://192.168.250.9:8088/signalr/connect?clientProtocol=1.4&transport=longPolling&connectionData=[ { “名称”： “配置”}]＆安培; connectionToken = AQAAANCMnd8BFdERjHoAwE％2FCl％2BsBAAAAVaJK6bsSpkyFVlk1Ej463gAAAAACAAAAAAADZgAAwAAAABAAAAAcSxXM3loQOfD31c8mYLdqAAAAAASAAACgAAAAEAAAAISDmfaiIg％2BY％2FVt3bBI％2BZkAoAAAAd％2FngqVkiFGH55BN9NOW4nljYZzHBBwoTLxNwrj％2B31AiShmmgS6euMBQAAADjFYeiwsjjJ％2BRVX92GYdozAkKthw％3D％3D 14：04：33.8799023 - 708038b9-66b0-4cc2-95ac-de45411e453c - 自动：失败连接到使用传输longPolling。 System.TimeoutException：运输超时尝试连接14:04：33.8799023 - 708038b9-66b0-4cc2-95ac-de45411e453c - 断开14：04：33.8799023 - 708038b9-66b0-4cc2-95ac-de45411e453c - Transport.Dispose（708038b9-66b0-4cc2-95ac-de45411e453c） 14：04：33.8799023 - 708038b9-66b0-4cc2-95ac-de45411e453c - 已关闭

3次出现此错误后，我也得到了这个：

14：14：24.0350106 - null - OnError（System.TimeoutException：客户端自2015年5月31日14:13:27以来一直处于非活动状态且已经超过了不活动超时00:00:50。停止连接。）

Answer 1

我成功地做了以下更改：

1）让客户端和服务器在断开连接（客户端）或处理（服务器）

之前有时间完成

服务器：

public void ChangePort(int port)
{
    Console.WriteLine("Received ChangePort request: " + port);
    Task.Delay(500).ContinueWith(_ => _restart(port));
}

客户：

_configurationProxy.Invoke("ChangePort", port)
    .ContinueWith(task =>
    {
        if (task.IsFaulted)
        {
            Console.WriteLine("ChangePort faulted: {0}", task.Exception.Flatten()); 
        }

        _hubConnection.Stop();
        _hubConnection.Dispose();
        _hubConnection = null;
    }).Wait();

2）似乎在服务器部署期间处置DependencyResolver并且永不返回时存在问题（请参阅此GitHub issue）。 This SO question描述了您遇到的非常类似的问题。这是解决方案：

internal class Startup
    {
        public Func<int, string> Restart;

        public void Configuration(IAppBuilder app)
        {
            var resolver = new DefaultDependencyResolver();
            resolver.Register(typeof(ConfigurationHub), () => new ConfigurationHub(Restart));

            var hubConfiguration = new HubConfiguration
            {
                EnableJSONP = true,
                EnableDetailedErrors = true,
                Resolver = resolver
            };

            app.MapSignalR(hubConfiguration);
        }
    }

Answer 2

我们有类似的情况！而不是更改端口，我需要重新启动客户端或服务器端。

我使用计时器并连接一个全局标志'来实现目的。例如如果没有连接，那么尝试每隔5秒就在客户端捕获一次连接功能，第二次尝试通常没问题，除非没有连接，它通常在第一次尝试失败，因为重启服务器的速度不够快！

SignalR更改端口 - SelfHost

2 个答案: