[英]SignalR change port - SelfHost
我正在嘗試使用遠程請求更改服務器的端口。 當我這樣做時,似乎一切正常,但是當我嘗試連接時,出現異常。
如果我關閉(終止進程),然后打開(啟動進程)服務器,則使用新端口的所有端口都將正常運行(客戶端將設法連接)。
服務器:
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);
}
}
客戶:
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);
}
}
例外:
場景:
從客戶端和服務器上的端口8089開始
按下客戶端和服務器上的按鈕更改為8088
關閉客戶
使用端口8088打開客戶端。
客戶端記錄:
14:04:18.2450308-空-ChangeState(已斷開連接,正在連接)14:04:18.7762877-708038b9-66b0-4cc2-95ac-de45411e453c-WS正在連接至:ws://192.168.250.9:8088 / signalr / connect?clientProtocol = 1.4&運輸=的WebSockets&connectionData = [{ “名稱”: “配置”}]&connectionToken = AQAAANCMnd8BFdERjHoAwE%2FCl%2BsBAAAAVaJK6bsSpkyFVlk1Ej463gAAAAACAAAAAAADZgAAwAAAABAAAAAcSxXM3loQOfD31c8mYLdqAAAAAASAAACgAAAAEAAAAISDmfaiIg%2BY%2FVt3bBI%2BZkAoAAAAd%2FngqVkiFGH55BN9NOW4nljYZzHBBwoTLxNwrj%2B31AiShmmgS6euMBQAAADjFYeiwsjjJ%2BRVX92GYdozAkKthw%3D%3D 14:04:23.8220044 - 708038b9-66b0-4cc2 -95ac-de45411e453c-自動:無法使用傳輸WebSockets連接到。 System.TimeoutException:嘗試連接的傳輸超時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= [ { “名稱”: “配置”}]&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(數據:已初始化)14:04:28.8486354-708038b9-66b0-4cc2-95ac-de45411e453c-自動:無法連接使用傳輸serverSentEvents。 System.TimeoutException:嘗試連接的傳輸超時14:04:28.8642594-708038b9-66b0-4cc2-95ac-de45411e453c-LP連接: http : //192.168.250.9 :8088/signalr/connect?clientProtocol=1.4&transport=longPolling&connectionData= [ { “名稱”: “配置”}]&connectionToken = AQAAANCMnd8BFdERjHoAwE%2FCl%2BsBAAAAVaJK6bsSpkyFVlk1Ej463gAAAAACAAAAAAADZgAAwAAAABAAAAAcSxXM3loQOfD31c8mYLdqAAAAAASAAACgAAAAEAAAAISDmfaiIg%2BY%2FVt3bBI%2BZkAoAAAAd%2FngqVkiFGH55BN9NOW4nljYZzHBBwoTLxNwrj%2B31AiShmmgS6euMBQAAADjFYeiwsjjJ%2BRVX92GYdozAkKthw%3D%3D 14:04:33.8799023 - 708038b9-66b0-4cc2-95ac-de45411e453c -自動:使用傳輸longPolling無法連接。 System.TimeoutException:嘗試連接的傳輸超時14:04:33.8799023-708038b9-66b0-4cc2-95ac-de45411e453c-斷開連接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-已關閉
3次后收到此錯誤,我也得到這個:
14:14:24.0350106-空-OnError(System.TimeoutException:自2015年5月31日起客戶端處於非活動狀態14:13:27且已超過非活動超時時間00:00:50。正在停止連接。)
我設法通過以下更改使其工作:
1)讓客戶端和服務器有時間在斷開連接(客戶端)或處置(服務器)之前完成
服務器:
public void ChangePort(int port)
{
Console.WriteLine("Received ChangePort request: " + port);
Task.Delay(500).ContinueWith(_ => _restart(port));
}
客戶:
_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)似乎有一個問題,就是在服務器處置期間DependencyResolver
被處置,並且再也不會回來(請參閱GitHub問題 )。 這樣的問題描述了您遇到的非常相似的問題。 這是解決方案:
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);
}
}
我們有類似的情況! 而不是更改端口,我需要重新啟動客戶端或服務器端。
我使用計時器和一個“已連接”全局標志來達到目的。 例如,如果未連接,則每隔5秒嘗試在客戶端中捕獲一次連接功能,除非沒有連接,第二次嘗試通常可以,除非沒有連接,否則通常在第一次嘗試中會失敗,因為服務器的重啟速度不夠快!
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