Add polyglot endpoint callback exports

src/Aspire.Hosting/ApplicationModel/EndpointUpdateContext.cs

@@ -0,0 +1,110 @@
+// Licensed to the .NET Foundation under one or more agreements.
+// The .NET Foundation licenses this file to you under the MIT license.
+
+using System.Net.Sockets;
+
+namespace Aspire.Hosting.ApplicationModel;
+
+/// <summary>
+/// Provides a mutable callback context for updating an endpoint in polyglot app hosts.
+/// </summary>
+[AspireExport(ExposeProperties = true)]
+internal sealed class EndpointUpdateContext(EndpointAnnotation endpointAnnotation)
+{
+    private readonly EndpointAnnotation _endpointAnnotation = endpointAnnotation ?? throw new ArgumentNullException(nameof(endpointAnnotation));
+
+    /// <summary>
+    /// Gets the endpoint name.
+    /// </summary>
+    public string Name => _endpointAnnotation.Name;
+
+    /// <summary>
+    /// Gets or sets the network protocol.
+    /// </summary>
+    public ProtocolType Protocol
+    {
+        get => _endpointAnnotation.Protocol;
+        set => _endpointAnnotation.Protocol = value;
+    }
+
+    /// <summary>
+    /// Gets or sets the desired host port.
+    /// </summary>
+    public int? Port
+    {
+        get => _endpointAnnotation.Port;
+        set => _endpointAnnotation.Port = value;
+    }
+
+    /// <summary>
+    /// Gets or sets the target port.
+    /// </summary>
+    public int? TargetPort
+    {
+        get => _endpointAnnotation.TargetPort;
+        set => _endpointAnnotation.TargetPort = value;
+    }
+
+    /// <summary>
+    /// Gets or sets the URI scheme.
+    /// </summary>
+    public string UriScheme
+    {
+        get => _endpointAnnotation.UriScheme;
+        set => _endpointAnnotation.UriScheme = value;
+    }
+
+    /// <summary>
+    /// Gets or sets the target host.
+    /// </summary>
+    public string TargetHost
+    {
+        get => _endpointAnnotation.TargetHost;
+        set => _endpointAnnotation.TargetHost = value;
+    }
+
+    /// <summary>
+    /// Gets or sets the transport.
+    /// </summary>
+    public string Transport
+    {
+        get => _endpointAnnotation.Transport;
+        set => _endpointAnnotation.Transport = value;
+    }
+
+    /// <summary>
+    /// Gets or sets a value indicating whether the endpoint is external.
+    /// </summary>
+    public bool IsExternal
+    {
+        get => _endpointAnnotation.IsExternal;
+        set => _endpointAnnotation.IsExternal = value;
+    }
+
+    /// <summary>
+    /// Gets or sets a value indicating whether the endpoint is proxied.
+    /// </summary>
+    public bool IsProxied
+    {
+        get => _endpointAnnotation.IsProxied;
+        set => _endpointAnnotation.IsProxied = value;
+    }
+
+    /// <summary>
+    /// Gets or sets a value indicating whether the endpoint is excluded from the default reference set.
+    /// </summary>
+    public bool ExcludeReferenceEndpoint
+    {
+        get => _endpointAnnotation.ExcludeReferenceEndpoint;
+        set => _endpointAnnotation.ExcludeReferenceEndpoint = value;
+    }
+
+    /// <summary>
+    /// Gets or sets a value indicating whether TLS is enabled.
+    /// </summary>
+    public bool TlsEnabled
+    {
+        get => _endpointAnnotation.TlsEnabled;
+        set => _endpointAnnotation.TlsEnabled = value;
+    }
+}

src/Aspire.Hosting/ResourceBuilderExtensions.cs

@@ -1210,9 +1210,9 @@ private static void ApplyEndpoints<T>(this IResourceBuilder<T> builder, IResourc
     ///                        });
     /// </code>
     /// </example>
-    /// <para>This method is not available in polyglot app hosts. Use the parameter-based overload instead.</para>
+    /// <para>This method is not available in polyglot app hosts. Use the callback-based endpoint mutation export instead.</para>
     /// </remarks>
-    [AspireExportIgnore(Reason = "EndpointAnnotation has read-only properties AllocatedEndpointSnapshot and AllAllocatedEndpoints that are not ATS-compatible. Callback-free variant is exported.")]
+    [AspireExportIgnore(Reason = "Polyglot app hosts use the internal withEndpointCallback export, which exposes EndpointUpdateContext instead of EndpointAnnotation.")]
     [System.Diagnostics.CodeAnalysis.SuppressMessage("ApiDesign", "RS0026:Do not add multiple public overloads with optional parameters", Justification = "<Pending>")]
     public static IResourceBuilder<T> WithEndpoint<T>(this IResourceBuilder<T> builder, [EndpointName] string endpointName, Action<EndpointAnnotation> callback, bool createIfNotExists = true) where T : IResourceWithEndpoints
     {
@@ -1247,6 +1247,33 @@ public static IResourceBuilder<T> WithEndpoint<T>(this IResourceBuilder<T> build
         return builder;
     }
 
+    [AspireExport(Description = "Updates a named endpoint via callback")]
+    internal static IResourceBuilder<T> WithEndpointCallback<T>(this IResourceBuilder<T> builder, [EndpointName] string endpointName, Action<EndpointUpdateContext> callback, bool createIfNotExists = true) where T : IResourceWithEndpoints
+    {
+        ArgumentNullException.ThrowIfNull(builder);
+        ArgumentNullException.ThrowIfNull(endpointName);
+        ArgumentNullException.ThrowIfNull(callback);
+
+        return builder.WithEndpoint(endpointName, endpoint => callback(new EndpointUpdateContext(endpoint)), createIfNotExists);
+    }
+
+    [AspireExport(Description = "Updates an HTTP endpoint via callback")]
+    internal static IResourceBuilder<T> WithHttpEndpointCallback<T>(this IResourceBuilder<T> builder, Action<EndpointUpdateContext> callback, [EndpointName] string? name = null, bool createIfNotExists = true) where T : IResourceWithEndpoints
+    {
+        ArgumentNullException.ThrowIfNull(builder);
+        ArgumentNullException.ThrowIfNull(callback);
+
+        var endpointName = name ?? "http";
+
+        if (createIfNotExists &&
+            !builder.Resource.Annotations.OfType<EndpointAnnotation>().Any(endpoint => string.Equals(endpoint.Name, endpointName, StringComparisons.EndpointAnnotationName)))
+        {
+            builder.WithHttpEndpoint(name: endpointName);
+        }
+
+        return builder.WithEndpoint(endpointName, endpoint => callback(new EndpointUpdateContext(endpoint)), createIfNotExists: false);
+    }
+
     /// <summary>
     /// Exposes an endpoint on a resource. A reference to this endpoint can be retrieved using <see cref="ResourceBuilderExtensions.GetEndpoint{T}(IResourceBuilder{T}, string, NetworkIdentifier)"/>.
     /// The endpoint name will be the scheme name if not specified.
@@ -1394,7 +1421,6 @@ public static IResourceBuilder<T> WithExternalHttpEndpoints<T>(this IResourceBui
 
         return builder;
     }
-
     /// <summary>
     /// Gets an <see cref="EndpointReference"/> by name from the resource. These endpoints are declared either using <see cref="WithEndpoint{T}(IResourceBuilder{T}, int?, int?, string?, string?, string?, bool, bool?, ProtocolType?)"/> or by launch settings (for project resources).
     /// The <see cref="EndpointReference"/> can be used to resolve the address of the endpoint in <see cref="WithEnvironment{T}(IResourceBuilder{T}, Action{EnvironmentCallbackContext})"/>.