Allow DAPR apps without a http endpoint to function correctly

Aspire.sln

@@ -635,11 +635,13 @@ Project("{9A19103F-16F7-4668-BE54-9A1E7A4F7556}") = "AzureContainerApps.ApiServi
 EndProject
 Project("{9A19103F-16F7-4668-BE54-9A1E7A4F7556}") = "Aspire.ProjectTemplates", "src\Aspire.ProjectTemplates\Aspire.ProjectTemplates.csproj", "{D07A8344-C61A-478A-92F0-E9B2DA00D647}"
 EndProject
-Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "WaitFor.Frontend", "playground\waitfor\WaitFor.Frontend\WaitFor.Frontend.csproj", "{C88BBF0B-7566-48BD-A2BC-05374B1A2B22}"
+Project("{9A19103F-16F7-4668-BE54-9A1E7A4F7556}") = "WaitFor.Frontend", "playground\waitfor\WaitFor.Frontend\WaitFor.Frontend.csproj", "{C88BBF0B-7566-48BD-A2BC-05374B1A2B22}"
 EndProject
 Project("{2150E333-8FDC-42A3-9474-1A3956D46DE8}") = "HealthChecks", "HealthChecks", "{B7345F72-712F-436C-AE18-CAF7CDD4A990}"
 EndProject
-Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "HealthChecksSandbox.AppHost", "playground\HealthChecks\HealthChecksSandbox.AppHost\HealthChecksSandbox.AppHost.csproj", "{042DD8C6-A26C-4B06-80A1-FE7F8659C5BC}"
+Project("{9A19103F-16F7-4668-BE54-9A1E7A4F7556}") = "HealthChecksSandbox.AppHost", "playground\HealthChecks\HealthChecksSandbox.AppHost\HealthChecksSandbox.AppHost.csproj", "{042DD8C6-A26C-4B06-80A1-FE7F8659C5BC}"
+EndProject
+Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "DaprServiceC", "playground\dapr\ServiceC\DaprServiceC.csproj", "{B26653B9-439E-4850-A7F8-43C6E5121952}"
 EndProject
 Global
 	GlobalSection(SolutionConfigurationPlatforms) = preSolution
@@ -1683,6 +1685,10 @@ Global
 		{042DD8C6-A26C-4B06-80A1-FE7F8659C5BC}.Debug|Any CPU.Build.0 = Debug|Any CPU
 		{042DD8C6-A26C-4B06-80A1-FE7F8659C5BC}.Release|Any CPU.ActiveCfg = Release|Any CPU
 		{042DD8C6-A26C-4B06-80A1-FE7F8659C5BC}.Release|Any CPU.Build.0 = Release|Any CPU
+		{B26653B9-439E-4850-A7F8-43C6E5121952}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{B26653B9-439E-4850-A7F8-43C6E5121952}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{B26653B9-439E-4850-A7F8-43C6E5121952}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{B26653B9-439E-4850-A7F8-43C6E5121952}.Release|Any CPU.Build.0 = Release|Any CPU
 	EndGlobalSection
 	GlobalSection(SolutionProperties) = preSolution
 		HideSolutionNode = FALSE
@@ -1991,6 +1997,7 @@ Global
 		{C88BBF0B-7566-48BD-A2BC-05374B1A2B22} = {3FF3F00C-95C0-46FC-B2BE-A3920C71E393}
 		{B7345F72-712F-436C-AE18-CAF7CDD4A990} = {D173887B-AF42-4576-B9C1-96B9E9B3D9C0}
 		{042DD8C6-A26C-4B06-80A1-FE7F8659C5BC} = {B7345F72-712F-436C-AE18-CAF7CDD4A990}
+		{B26653B9-439E-4850-A7F8-43C6E5121952} = {57A42144-739E-49A7-BADB-BB8F5F20FA17}
 	EndGlobalSection
 	GlobalSection(ExtensibilityGlobals) = postSolution
 		SolutionGuid = {6DCEDFEC-988E-4CB3-B45B-191EB5086E0C}

Directory.Packages.props

@@ -96,7 +96,7 @@
     <PackageVersion Include="Microsoft.Extensions.Configuration.Binder" Version="$(MicrosoftExtensionsConfigurationBinderPackageVersion)" />
     <PackageVersion Include="Microsoft.Extensions.DependencyInjection.Abstractions" Version="$(MicrosoftExtensionsDependencyInjectionAbstractionsPackageVersion)" />
     <PackageVersion Include="Microsoft.Extensions.Hosting.Abstractions" Version="$(MicrosoftExtensionsHostingAbstractionsPackageVersion)" />
-    <PackageVersion Include="Microsoft.Extensions.Hosting" Version="$(MicrosoftExtensionsHostingPackageVersion)" />
+    <PackageVersion Include="Microsoft.Extensions.Hosting" Version="8.0.1" />
     <PackageVersion Include="Microsoft.Extensions.Http" Version="$(MicrosoftExtensionsHttpPackageVersion)" />
     <PackageVersion Include="Microsoft.Extensions.Logging.Abstractions" Version="$(MicrosoftExtensionsLoggingAbstractionsPackageVersion)" />
     <PackageVersion Include="Microsoft.Extensions.Options" Version="$(MicrosoftExtensionsOptionsPackageVersion)" />
@@ -189,11 +189,10 @@
     <PackageVersion Include="Microsoft.Azure.Functions.Worker.Extensions.Storage.Blobs" Version="6.6.0" />
     <PackageVersion Include="Microsoft.Azure.Functions.Worker.Extensions.Storage.Queues" Version="5.5.0" />
     <PackageVersion Include="Microsoft.Azure.Functions.Worker.Extensions.ServiceBus" Version="5.22.0" />
-    <PackageVersion Include="Microsoft.Azure.Functions.Worker.Extensions.EventHubs" Version="6.3.6"/>
+    <PackageVersion Include="Microsoft.Azure.Functions.Worker.Extensions.EventHubs" Version="6.3.6" />
     <PackageVersion Include="Microsoft.Azure.Functions.Worker.OpenTelemetry" Version="1.0.0-preview1" />
     <PackageVersion Include="Microsoft.Azure.Functions.Worker.Sdk" Version="1.18.1" />
     <PackageVersion Include="Microsoft.ApplicationInsights.WorkerService" Version="2.22.0" />
-
     <!-- Pinned versions for Component Governance - Remove when root dependencies are updated -->
     <PackageVersion Include="Azure.Core" Version="1.44.1" />
     <PackageVersion Include="Azure.Identity" Version="1.12.1" />
@@ -202,4 +201,4 @@
     <PackageVersion Include="System.Formats.Asn1" Version="$(SystemFormatsAsn1PackageVersion)" />
     <PackageVersion Include="System.Text.Json" Version="$(SystemTextJsonPackageVersion)" />
   </ItemGroup>
-</Project>
+</Project>

playground/Directory.Packages.props

@@ -1,5 +1,7 @@
 <Project>
   <Import Project="$(MSBuildThisFileDirectory)..\Directory.Packages.Helix.props" Condition="'$(TestsRunningOutsideOfRepo)' == 'true'" />
-
   <Import Project="$([MSBuild]::GetPathOfFileAbove('Directory.Packages.props', '$(MSBuildThisFileDirectory)../'))" Condition="'$(TestsRunningOutsideOfRepo)' != 'true'" />
-</Project>
+  <ItemGroup>
+    <PackageVersion Include="Dapr.Client" Version="1.14.0" />
+  </ItemGroup>
+</Project>

playground/dapr/Dapr.AppHost/Dapr.AppHost.csproj

@@ -19,6 +19,7 @@
 
     <ProjectReference Include="..\ServiceA\DaprServiceA.csproj" />
     <ProjectReference Include="..\ServiceB\DaprServiceB.csproj" />
+    <ProjectReference Include="..\ServiceC\DaprServiceC.csproj" />
   </ItemGroup>
 
 </Project>

playground/dapr/Dapr.AppHost/Program.cs

@@ -18,6 +18,11 @@
        .WithDaprSidecar()
        .WithReference(pubSub);
 
+// console app with no appPort (sender only)
+builder.AddProject<Projects.DaprServiceC>("servicec")
+       .WithReference(stateStore)
+       .WithDaprSidecar();
+
 #if !SKIP_DASHBOARD_REFERENCE
 // This project is only added in playground projects to support development/debugging
 // of the dashboard. It is not required in end developer code. Comment out this code

playground/dapr/ServiceC/DaprServiceC.csproj

@@ -0,0 +1,15 @@
+<Project Sdk="Microsoft.NET.Sdk.Worker">
+
+  <PropertyGroup>
+    <OutputType>Exe</OutputType>
+    <TargetFramework>net8.0</TargetFramework>
+    <ImplicitUsings>enable</ImplicitUsings>
+    <Nullable>enable</Nullable>
+  </PropertyGroup>
+
+  <ItemGroup>
+    <PackageReference Include="Dapr.Client" />
+    <PackageReference Include="Microsoft.Extensions.Hosting" />
+  </ItemGroup>
+
+</Project>

playground/dapr/ServiceC/Program.cs

@@ -0,0 +1,41 @@
+// Licensed to the .NET Foundation under one or more agreements.
+// The .NET Foundation licenses this file to you under the MIT license.
+
+using Dapr.Client;
+using Test;
+
+var builder = Host.CreateApplicationBuilder(args);
+
+var dapr = new DaprClientBuilder()
+    .Build();
+
+builder.Services.AddSingleton<DaprClient>(dapr);
+
+builder.Services.AddHostedService<Worker>();
+
+var app = builder.Build();
+
+await app.RunAsync();
+
+Console.WriteLine("Goodbye, World!");
+
+namespace Test
+{
+    public sealed class Worker(ILogger<Worker> logger, DaprClient dapr) : BackgroundService
+    {
+        protected override async Task ExecuteAsync(CancellationToken stoppingToken)
+        {
+            await dapr.WaitForSidecarAsync(stoppingToken);
+
+            while (!stoppingToken.IsCancellationRequested)
+            {
+                var state = await dapr.GetStateAsync<string?>(
+                    "statestore", "cache", cancellationToken: stoppingToken);
+
+                logger.LogInformation("State: {0}", state ?? "<null>");
+
+                await Task.Delay(1000, stoppingToken);
+            }
+        }
+    }
+}

src/Aspire.Hosting.Dapr/DaprDistributedApplicationLifecycleHook.cs

@@ -190,12 +190,10 @@ public async Task BeforeStartAsync(DistributedApplicationModel appModel, Cancell
                     {
                         updatedArgs.AddRange(daprCommandLine.Arguments);
                         var endPoint = GetEndpointReference(sidecarOptions, resource);
-                        if (endPoint is not null)
+
+                        if (sidecarOptions?.AppPort is null && endPoint is { appEndpoint.IsAllocated: true })
                         {
-                            if (endPoint.Value.appEndpoint.IsAllocated && sidecarOptions?.AppPort is null)
-                            {
-                                updatedArgs.AddRange(daprAppPortArg(endPoint.Value.appEndpoint.Port)());
-                            }
+                            updatedArgs.AddRange(daprAppPortArg(endPoint.Value.appEndpoint.Port)());
                         }
 
                         var grpc = daprCli.GetEndpoint("grpc");
@@ -213,11 +211,11 @@ public async Task BeforeStartAsync(DistributedApplicationModel appModel, Cancell
                             updatedArgs.AddRange(daprProfilePortArg(profiling.Property(EndpointProperty.TargetPort))());
                         }
 
-                        if (sidecarOptions?.AppChannelAddress is null && endPoint is not null)
+                        if (sidecarOptions?.AppChannelAddress is null && endPoint is { appEndpoint.IsAllocated: true })
                         {
                             updatedArgs.AddRange(daprAppChannelAddressArg(endPoint.Value.appEndpoint.Host)());
                         }
-                        if (sidecarOptions?.AppProtocol is null && endPoint is not null)
+                        if (sidecarOptions?.AppProtocol is null && endPoint is { appEndpoint.IsAllocated: true }) 
                         {
                             updatedArgs.AddRange(daprAppProtocol(endPoint.Value.protocol)());
                         }