Fix creating temporary dashboard client on startup

src/Aspire.Dashboard/DashboardWebApplication.cs

@@ -232,6 +232,7 @@ public DashboardWebApplication(
 
         // Data from the server.
         builder.Services.TryAddScoped<IDashboardClient, DashboardClient>();
+        builder.Services.TryAddSingleton<IDashboardClientStatus, DashboardClientStatus>();
 
         // OTLP services.
         builder.Services.AddGrpc();
@@ -340,7 +341,7 @@ public DashboardWebApplication(
         {
             if (context.Request.Path.Equals(TargetLocationInterceptor.ResourcesPath, StringComparisons.UrlPath))
             {
-                var client = context.RequestServices.GetRequiredService<IDashboardClient>();
+                var client = context.RequestServices.GetRequiredService<IDashboardClientStatus>();
                 if (!client.IsEnabled)
                 {
                     context.Response.Redirect(TargetLocationInterceptor.StructuredLogsPath);

src/Aspire.Dashboard/ResourceService/DashboardClient.cs

@@ -31,7 +31,7 @@ namespace Aspire.Dashboard.Model;
 /// If the <c>DOTNET_RESOURCE_SERVICE_ENDPOINT_URL</c> environment variable is not specified, then there's
 /// no known endpoint to connect to, and this dashboard client will be disabled. Calls to
 /// <see cref="IDashboardClient.SubscribeResourcesAsync"/> and <see cref="IDashboardClient.SubscribeConsoleLogs"/>
-/// will throw if <see cref="IDashboardClient.IsEnabled"/> is <see langword="false"/>. Callers should
+/// will throw if <see cref="IDashboardClientStatus.IsEnabled"/> is <see langword="false"/>. Callers should
 /// check this property first, before calling these methods.
 /// </para>
 /// </remarks>
@@ -47,6 +47,7 @@ internal sealed class DashboardClient : IDashboardClient
     private readonly object _lock = new();
 
     private readonly ILoggerFactory _loggerFactory;
+    private readonly IDashboardClientStatus _dashboardClientStatus;
     private readonly BrowserTimeProvider _timeProvider;
     private readonly IKnownPropertyLookup _knownPropertyLookup;
     private readonly DashboardOptions _dashboardOptions;
@@ -71,11 +72,13 @@ public DashboardClient(
         ILoggerFactory loggerFactory,
         IConfiguration configuration,
         IOptions<DashboardOptions> dashboardOptions,
+        IDashboardClientStatus dashboardClientStatus,
         BrowserTimeProvider timeProvider,
         IKnownPropertyLookup knownPropertyLookup,
         Action<SocketsHttpHandler>? configureHttpHandler = null)
     {
         _loggerFactory = loggerFactory;
+        _dashboardClientStatus = dashboardClientStatus;
         _timeProvider = timeProvider;
         _knownPropertyLookup = knownPropertyLookup;
         _dashboardOptions = dashboardOptions.Value;
@@ -85,9 +88,7 @@ public DashboardClient(
 
         _logger = loggerFactory.CreateLogger<DashboardClient>();
 
-        var address = _dashboardOptions.ResourceServiceClient.GetUri();
-
-        if (address is null)
+        if (!_dashboardClientStatus.IsEnabled)
         {
             _state = StateDisabled;
             _logger.LogDebug($"{DashboardConfigNames.ResourceServiceUrlName.ConfigKey} is not specified. Dashboard client services are unavailable.");
@@ -96,6 +97,7 @@ public DashboardClient(
             return;
         }
 
+        var address = _dashboardOptions.ResourceServiceClient.GetUri()!;
         _logger.LogDebug("Dashboard configured to connect to: {Address}", address);
 
         // Create the gRPC channel. This channel performs automatic reconnects.

src/Aspire.Dashboard/ResourceService/DashboardClientStatus.cs

@@ -0,0 +1,12 @@
+// Licensed to the .NET Foundation under one or more agreements.
+// The .NET Foundation licenses this file to you under the MIT license.
+
+using Aspire.Dashboard.Configuration;
+using Microsoft.Extensions.Options;
+
+namespace Aspire.Dashboard.Model;
+
+internal sealed class DashboardClientStatus(IOptions<DashboardOptions> dashboardOptions) : IDashboardClientStatus
+{
+    public bool IsEnabled => dashboardOptions.Value.ResourceServiceClient.GetUri() is not null;
+}

src/Aspire.Dashboard/ResourceService/IDashboardClient.cs

@@ -8,17 +8,8 @@ namespace Aspire.Dashboard.Model;
 /// <summary>
 /// Provides data about active resources to external components, such as the dashboard.
 /// </summary>
-public interface IDashboardClient : IAsyncDisposable
+public interface IDashboardClient : IDashboardClientStatus, IAsyncDisposable
 {
-    /// <summary>
-    /// Gets whether this client object is enabled for use.
-    /// </summary>
-    /// <remarks>
-    /// Users of this client should check <see cref="IsEnabled"/> before calling
-    /// any other members of this interface, to avoid exceptions.
-    /// </remarks>
-    bool IsEnabled { get; }
-
     Task WhenConnected { get; }
 
     /// <summary>

src/Aspire.Dashboard/ResourceService/IDashboardClientStatus.cs

@@ -0,0 +1,16 @@
+// Licensed to the .NET Foundation under one or more agreements.
+// The .NET Foundation licenses this file to you under the MIT license.
+
+namespace Aspire.Dashboard.Model;
+
+public interface IDashboardClientStatus
+{
+    /// <summary>
+    /// Gets whether the client object is enabled for use.
+    /// </summary>
+    /// <remarks>
+    /// Users of <see cref="IDashboardClient"/> client should check <see cref="IsEnabled"/> before calling
+    /// any other members of this interface, to avoid exceptions.
+    /// </remarks>
+    bool IsEnabled { get; }
+}

tests/Aspire.Dashboard.Tests/Integration/DashboardClientAuthTests.cs

@@ -130,6 +130,7 @@ private static async Task<DashboardClient> CreateDashboardClientAsync(
             loggerFactory: loggerFactory,
             configuration: new ConfigurationManager(),
             dashboardOptions: Options.Create(options),
+            dashboardClientStatus: new TestDashboardClientStatus(),
             timeProvider: new BrowserTimeProvider(NullLoggerFactory.Instance),
             knownPropertyLookup: new MockKnownPropertyLookup(),
             configureHttpHandler: handler => handler.SslOptions.RemoteCertificateValidationCallback = (sender, cert, chain, sslPolicyErrors) => true);
@@ -159,6 +160,11 @@ private sealed class TestCalls
         public Channel<ReceivedCallInfo<ApplicationInformationRequest>> ApplicationInformationCallsChannel { get; } = Channel.CreateUnbounded<ReceivedCallInfo<ApplicationInformationRequest>>();
     }
 
+    private sealed class TestDashboardClientStatus : IDashboardClientStatus
+    {
+        public bool IsEnabled => true;
+    }
+
     private sealed class MockDashboardService(TestCalls testCalls) : DashboardServiceBase
     {
         public override Task<ApplicationInformationResponse> GetApplicationInformation(

tests/Aspire.Dashboard.Tests/Model/DashboardClientTests.cs

@@ -151,6 +151,11 @@ public async Task SubscribeResources_HasInitialData_InitialDataReturned()
 
     private DashboardClient CreateResourceServiceClient()
     {
-        return new DashboardClient(NullLoggerFactory.Instance, _configuration, _dashboardOptions, s_timeProvider, new MockKnownPropertyLookup());
+        return new DashboardClient(NullLoggerFactory.Instance, _configuration, _dashboardOptions, new TestDashboardClientStatus(), s_timeProvider, new MockKnownPropertyLookup());
+    }
+
+    private sealed class TestDashboardClientStatus : IDashboardClientStatus
+    {
+        public bool IsEnabled => true;
     }
 }