fix: expose ValueJsonConverter for generator support and add JsonSourceGenerator test cases

.github/workflows/ci.yml

@@ -53,6 +53,10 @@ jobs:
       - name: Test
         run: dotnet test -c Release --no-build --logger GitHubActions
 
+      - name: aot-publish test
+        run: |
+          dotnet publish ./samples/AspNetCore/Samples.AspNetCore.csproj
+
   packaging:
     needs: build
 

.github/workflows/dotnet-format.yml

@@ -23,4 +23,6 @@ jobs:
           global-json-file: global.json
 
       - name: dotnet format
-        run: dotnet format --verify-no-changes OpenFeature.slnx
+        run: |
+          # Exclude diagnostics to work around dotnet-format issue, see https://github.com/dotnet/sdk/issues/50012
+          dotnet format --verify-no-changes OpenFeature.slnx --exclude-diagnostics IL2026 --exclude-diagnostics IL3050

samples/AspNetCore/Program.cs

@@ -1,16 +1,23 @@
+using System.Text.Json;
+using System.Text.Json.Serialization;
 using Microsoft.AspNetCore.Mvc;
 using OpenFeature;
 using OpenFeature.DependencyInjection.Providers.Memory;
 using OpenFeature.Hooks;
+using OpenFeature.Model;
 using OpenFeature.Providers.Memory;
-using OpenTelemetry.Logs;
 using OpenTelemetry.Metrics;
 using OpenTelemetry.Resources;
 using OpenTelemetry.Trace;
 
-var builder = WebApplication.CreateBuilder(args);
+var builder = WebApplication.CreateSlimBuilder(args);
 
 // Add services to the container.
+builder.Services.ConfigureHttpJsonOptions(options =>
+{
+    options.SerializerOptions.TypeInfoResolverChain.Insert(0, AppJsonSerializerContext.Default);
+});
+
 builder.Services.AddProblemDetails();
 
 // Configure OpenTelemetry
@@ -40,6 +47,14 @@
             {
                 "welcome-message", new Flag<bool>(
                     new Dictionary<string, bool> { { "show", true }, { "hide", false } }, "show")
+            },
+            {
+                "test-config", new Flag<Value>(new Dictionary<string, Value>()
+                {
+                    { "enable", new Value(Structure.Builder().Set(nameof(TestConfig.Threshold), 100).Build()) },
+                    { "half", new Value(Structure.Builder().Set(nameof(TestConfig.Threshold), 50).Build()) },
+                    { "disable", new Value(Structure.Builder().Set(nameof(TestConfig.Threshold), 0).Build()) }
+                }, "disable")
             }
         });
 });
@@ -60,5 +75,24 @@
 
     return TypedResults.Ok("Hello world!");
 });
+app.MapGet("/test-config", async ([FromServices] IFeatureClient featureClient) =>
+{
+    var testConfigValue = await featureClient.GetObjectValueAsync("test-config",
+            new Value(Structure.Builder().Set("Threshold", 50).Build())
+        );
+    var json = JsonSerializer.Serialize(testConfigValue, AppJsonSerializerContext.Default.Value);
+    var config = JsonSerializer.Deserialize(json, AppJsonSerializerContext.Default.TestConfig);
+    return Results.Ok(config);
+});
 
 app.Run();
+
+
+public class TestConfig
+{
+    public int Threshold { get; set; } = 10;
+}
+
+[JsonSerializable(typeof(TestConfig))]
+[JsonSerializable(typeof(Value))]
+public partial class AppJsonSerializerContext : JsonSerializerContext;

samples/AspNetCore/Samples.AspNetCore.csproj

@@ -2,6 +2,8 @@
 
   <PropertyGroup>
     <ManagePackageVersionsCentrally>false</ManagePackageVersionsCentrally>
+    <PublishAot>true</PublishAot>
+    <InvariantGlobalization>true</InvariantGlobalization>
   </PropertyGroup>
 
   <ItemGroup>

src/Directory.Build.props

@@ -1,3 +1,7 @@
 <Project>
   <Import Project="$([MSBuild]::GetDirectoryNameOfFileAbove($(MSBuildProjectDirectory), 'OpenFeature.slnx'))\build\Common.prod.props" />
+  <PropertyGroup>
+    <!-- Enable native AOT related analyzers https://learn.microsoft.com/dotnet/core/deploying/native-aot/#aot-compatibility-analyzers -->
+    <IsAotCompatible>$([MSBuild]::IsTargetFrameworkCompatible('$(TargetFramework)', 'net8.0'))</IsAotCompatible>
+  </PropertyGroup>
 </Project>

src/OpenFeature.DependencyInjection/OpenFeatureBuilderExtensions.cs

@@ -272,7 +272,11 @@ public static OpenFeatureBuilder AddPolicyName(this OpenFeatureBuilder builder,
     /// <param name="builder">The <see cref="OpenFeatureBuilder"/> instance.</param>
     /// <param name="implementationFactory">Optional factory for controlling how <typeparamref name="THook"/> will be created in the DI container.</param>
     /// <returns>The <see cref="OpenFeatureBuilder"/> instance.</returns>
-    public static OpenFeatureBuilder AddHook<THook>(this OpenFeatureBuilder builder, Func<IServiceProvider, THook>? implementationFactory = null)
+    public static OpenFeatureBuilder AddHook<
+#if NET
+        [System.Diagnostics.CodeAnalysis.DynamicallyAccessedMembers(System.Diagnostics.CodeAnalysis.DynamicallyAccessedMemberTypes.PublicConstructors)]
+#endif
+        THook>(this OpenFeatureBuilder builder, Func<IServiceProvider, THook>? implementationFactory = null)
         where THook : Hook
     {
         return builder.AddHook(typeof(THook).Name, implementationFactory);
@@ -285,7 +289,11 @@ public static OpenFeatureBuilder AddHook<THook>(this OpenFeatureBuilder builder,
     /// <param name="builder">The <see cref="OpenFeatureBuilder"/> instance.</param>
     /// <param name="hook">Instance of Hook to inject into the OpenFeature context.</param>
     /// <returns>The <see cref="OpenFeatureBuilder"/> instance.</returns>
-    public static OpenFeatureBuilder AddHook<THook>(this OpenFeatureBuilder builder, THook hook)
+    public static OpenFeatureBuilder AddHook<
+#if NET
+        [System.Diagnostics.CodeAnalysis.DynamicallyAccessedMembers(System.Diagnostics.CodeAnalysis.DynamicallyAccessedMemberTypes.PublicConstructors)]
+#endif
+        THook>(this OpenFeatureBuilder builder, THook hook)
         where THook : Hook
     {
         return builder.AddHook(typeof(THook).Name, hook);
@@ -299,7 +307,11 @@ public static OpenFeatureBuilder AddHook<THook>(this OpenFeatureBuilder builder,
     /// <param name="hookName">The name of the <see cref="Hook"/> that is being added.</param>
     /// <param name="hook">Instance of Hook to inject into the OpenFeature context.</param>
     /// <returns>The <see cref="OpenFeatureBuilder"/> instance.</returns>
-    public static OpenFeatureBuilder AddHook<THook>(this OpenFeatureBuilder builder, string hookName, THook hook)
+    public static OpenFeatureBuilder AddHook<
+#if NET
+        [System.Diagnostics.CodeAnalysis.DynamicallyAccessedMembers(System.Diagnostics.CodeAnalysis.DynamicallyAccessedMemberTypes.PublicConstructors)]
+#endif
+        THook>(this OpenFeatureBuilder builder, string hookName, THook hook)
         where THook : Hook
     {
         return builder.AddHook(hookName, _ => hook);
@@ -313,7 +325,12 @@ public static OpenFeatureBuilder AddHook<THook>(this OpenFeatureBuilder builder,
     /// <param name="hookName">The name of the <see cref="Hook"/> that is being added.</param>
     /// <param name="implementationFactory">Optional factory for controlling how <typeparamref name="THook"/> will be created in the DI container.</param>
     /// <returns>The <see cref="OpenFeatureBuilder"/> instance.</returns>
-    public static OpenFeatureBuilder AddHook<THook>(this OpenFeatureBuilder builder, string hookName, Func<IServiceProvider, THook>? implementationFactory = null)
+    public static OpenFeatureBuilder AddHook<
+#if NET
+            [System.Diagnostics.CodeAnalysis.DynamicallyAccessedMembers(System.Diagnostics.CodeAnalysis.DynamicallyAccessedMemberTypes.PublicConstructors)]
+#endif
+            THook>
+        (this OpenFeatureBuilder builder, string hookName, Func<IServiceProvider, THook>? implementationFactory = null)
         where THook : Hook
     {
         builder.Services.PostConfigure<OpenFeatureOptions>(options => options.AddHookName(hookName));

src/OpenFeature/Model/ValueJsonConverter.cs

@@ -4,11 +4,16 @@
 
 namespace OpenFeature.Model;
 
-internal sealed class ValueJsonConverter : JsonConverter<Value>
+/// <summary>
+/// A <see cref="JsonConverter{T}"/> for <see cref="Value"/> for Json serialization
+/// </summary>
+public sealed class ValueJsonConverter : JsonConverter<Value>
 {
+    /// <inheritdoc />
     public override void Write(Utf8JsonWriter writer, Value value, JsonSerializerOptions options) =>
         WriteJsonValue(value, writer);
 
+    /// <inheritdoc />
     public override Value Read(ref Utf8JsonReader reader, Type typeToConvert, JsonSerializerOptions options) =>
         ReadJsonValue(ref reader);
 

test/OpenFeature.Tests/StructureTests.cs

@@ -1,6 +1,7 @@
 using System.Collections.Immutable;
 using System.Text.Json;
 using System.Text.Json.Nodes;
+using System.Text.Json.Serialization;
 using OpenFeature.Model;
 
 namespace OpenFeature.Tests;
@@ -125,6 +126,15 @@ public void JsonSerializeTest(Value value, string expectedJson)
         Assert.True(JsonNode.DeepEquals(expectJsonNode, serializedJsonNode));
     }
 
+    [Theory]
+    [MemberData(nameof(JsonSerializeTestData))]
+    public void JsonSerializeWithGeneratorTest(Value value, string expectedJson)
+    {
+        var serializedJsonNode = JsonSerializer.SerializeToNode(value, ValueJsonSerializerContext.Default.Value);
+        var expectJsonNode = JsonNode.Parse(expectedJson);
+        Assert.True(JsonNode.DeepEquals(expectJsonNode, serializedJsonNode));
+    }
+
     [Theory]
     [MemberData(nameof(JsonSerializeTestData))]
     public void JsonDeserializeTest(Value value, string expectedJson)
@@ -135,6 +145,17 @@ public void JsonDeserializeTest(Value value, string expectedJson)
         Assert.True(JsonNode.DeepEquals(expectJsonNode, serializedJsonNode));
     }
 
+    [Theory]
+    [MemberData(nameof(JsonSerializeTestData))]
+    public void JsonDeserializeWithGeneratorTest(Value value, string expectedJson)
+    {
+        var serializedJsonNode = JsonSerializer.SerializeToNode(value, ValueJsonSerializerContext.Default.Value);
+        var expectValue = JsonSerializer.Deserialize(expectedJson, ValueJsonSerializerContext.Default.Value);
+        Assert.NotNull(expectValue);
+        var expectJsonNode = JsonSerializer.SerializeToNode(expectValue, ValueJsonSerializerContext.Default.Value);
+        Assert.True(JsonNode.DeepEquals(expectJsonNode, serializedJsonNode));
+    }
+
     public static IEnumerable<object[]> JsonSerializeTestData()
     {
         yield return [new Value("test"), "\"test\""];
@@ -178,3 +199,8 @@ public static IEnumerable<object[]> JsonSerializeTestData()
         ];
     }
 }
+
+[JsonSerializable(typeof(Value))]
+public partial class ValueJsonSerializerContext : JsonSerializerContext
+{
+}