Make Utilities.Introspection AOT compatible (#8872)

Author: michaelstaib

src/HotChocolate/Utilities/src/Utilities.DependencyInjection/HotChocolate.Utilities.DependencyInjection.csproj

@@ -7,6 +7,10 @@
     <Description>Contains internal helper classes for Microsoft's dependency injection used by the Hot Chocolate GraphQL type system and the GraphQL query execution engine.</Description>
   </PropertyGroup>
 
+  <PropertyGroup>
+    <IsAotCompliant>true</IsAotCompliant>
+  </PropertyGroup>
+
   <ItemGroup>
     <InternalsVisibleTo Include="HotChocolate.AspNetCore" />
     <InternalsVisibleTo Include="HotChocolate.Execution" />

src/HotChocolate/Utilities/src/Utilities.Introspection/HotChocolate.Utilities.Introspection.csproj

@@ -7,6 +7,10 @@
     <Description>Contains an introspection client to download a GraphQL schema over HTTP.</Description>
   </PropertyGroup>
 
+  <PropertyGroup>
+    <IsAotCompliant>true</IsAotCompliant>
+  </PropertyGroup>
+
   <ItemGroup>
     <InternalsVisibleTo Include="HotChocolate.Utilities.Introspection.Tests" />
   </ItemGroup>

src/HotChocolate/Utilities/src/Utilities.Introspection/IntrospectionClient.cs

@@ -1,6 +1,5 @@
 using System.Text;
 using System.Text.Json;
-using System.Text.Json.Serialization;
 using HotChocolate.Language;
 using HotChocolate.Transport.Http;
 using static HotChocolate.Utilities.Introspection.CapabilityInspector;
@@ -13,11 +12,8 @@ namespace HotChocolate.Utilities.Introspection;
 /// </summary>
 public static class IntrospectionClient
 {
-    private static readonly JsonSerializerOptions s_serializerOptions = new()
-    {
-        PropertyNamingPolicy = JsonNamingPolicy.CamelCase,
-        Converters = { new JsonStringEnumConverter() }
-    };
+    private static readonly JsonSerializerOptions s_serializerOptions =
+        new(IntrospectionJsonSerializerContext.Default.Options);
 
     internal static JsonSerializerOptions SerializerOptions => s_serializerOptions;
 
@@ -245,12 +241,12 @@ private static async Task<IntrospectionResult> IntrospectAsync(
 
         if (result.Data.ValueKind is JsonValueKind.Object)
         {
-            data = result.Data.Deserialize<IntrospectionData>(s_serializerOptions);
+            data = result.Data.Deserialize(IntrospectionJsonSerializerContext.Default.IntrospectionData);
         }
 
         if (result.Errors.ValueKind is JsonValueKind.Array)
         {
-            errors = result.Errors.Deserialize<IntrospectionError[]>(s_serializerOptions);
+            errors = result.Errors.Deserialize(IntrospectionJsonSerializerContext.Default.IntrospectionErrorArray);
         }
 
         return new IntrospectionResult(data, errors);

src/HotChocolate/Utilities/src/Utilities.Introspection/IntrospectionJsonSerializerContext.cs

@@ -0,0 +1,21 @@
+using System.Text.Json.Serialization;
+
+namespace HotChocolate.Utilities.Introspection;
+
+[JsonSourceGenerationOptions(
+    PropertyNamingPolicy = JsonKnownNamingPolicy.CamelCase,
+    DefaultIgnoreCondition = JsonIgnoreCondition.Never)]
+[JsonSerializable(typeof(IntrospectionResult))]
+[JsonSerializable(typeof(IntrospectionData))]
+[JsonSerializable(typeof(IntrospectionError))]
+[JsonSerializable(typeof(IntrospectionError[]))]
+[JsonSerializable(typeof(Schema))]
+[JsonSerializable(typeof(FullType))]
+[JsonSerializable(typeof(Field))]
+[JsonSerializable(typeof(InputField))]
+[JsonSerializable(typeof(Directive))]
+[JsonSerializable(typeof(TypeRef))]
+[JsonSerializable(typeof(RootTypeRef))]
+[JsonSerializable(typeof(EnumValue))]
+[JsonSerializable(typeof(TypeKind))]
+internal sealed partial class IntrospectionJsonSerializerContext : JsonSerializerContext;

src/HotChocolate/Utilities/src/Utilities.Introspection/Models/TypeKind.cs

@@ -1,7 +1,10 @@
 #nullable disable
 
+using System.Text.Json.Serialization;
+
 namespace HotChocolate.Utilities.Introspection;
 
+[JsonConverter(typeof(JsonStringEnumConverter<TypeKind>))]
 public enum TypeKind
 {
     INTERFACE = 0,