feat: configure AOT for trimming compatibility

.github/workflows/ci-cd.yml

@@ -36,3 +36,18 @@ jobs:
         shell: pwsh
         run: |
           dotnet test Microsoft.OpenApi.sln -c Release -v n
+
+  validate-trimming:
+    name: Validate Project for Trimming
+    runs-on: windows-latest
+    steps:
+      - uses: actions/checkout@v4
+
+      - name: Setup .NET
+        uses: actions/setup-dotnet@v4
+        with:
+          dotnet-version: 8.x
+
+      - name: Validate Trimming warnings
+        run: dotnet publish -c Release -r win-x64 /p:TreatWarningsAsErrors=true /warnaserror -f net8.0
+        working-directory: ./test/Microsoft.OpenApi.Trimming.Tests

src/Microsoft.OpenApi.Readers/Microsoft.OpenApi.Readers.csproj

@@ -1,12 +1,14 @@
 <Project Sdk="Microsoft.NET.Sdk">
     <PropertyGroup>
-        <TargetFrameworks>netstandard2.0;net6.0;</TargetFrameworks>
+        <TargetFrameworks>netstandard2.0;net8.0;</TargetFrameworks>
         <!-- net6.0 target is present because of the conditional build in OpenApiYamlReader.Read -->
         <LangVersion>latest</LangVersion>
         <GeneratePackageOnBuild>true</GeneratePackageOnBuild>
         <Version>2.0.0-preview4</Version>
         <Description>OpenAPI.NET Readers for JSON and YAML documents</Description>
         <SignAssembly>true</SignAssembly>
+        <IsTrimmable Condition="$([MSBuild]::IsTargetFrameworkCompatible('$(TargetFramework)','net5.0'))">true</IsTrimmable>
+        <IsAotCompatible Condition="$([MSBuild]::IsTargetFrameworkCompatible('$(TargetFramework)','net8.0'))">true</IsAotCompatible>
         <!-- https://github.com/dotnet/sourcelink/blob/main/docs/README.md#embeduntrackedsources -->
         <EmbedUntrackedSources>true</EmbedUntrackedSources>
         <NoWarn>NU5048</NoWarn>

src/Microsoft.OpenApi/Extensions/StringExtensions.cs

@@ -34,7 +34,7 @@ internal static class StringExtensions
         {
             var type = typeof(T);
 
-            var displayMap = EnumDisplayCache.GetOrAdd(type, GetEnumValues<T>);
+            var displayMap = EnumDisplayCache.GetOrAdd(type, _=> GetEnumValues<T>(type));
 
             if (displayMap.TryGetValue(displayName, out var cachedValue))
             {
@@ -45,7 +45,7 @@ internal static class StringExtensions
             result = default;
             return false;
         }
-        private static ReadOnlyDictionary<string, object> GetEnumValues<T>(Type enumType) where T : Enum
+        private static ReadOnlyDictionary<string, object> GetEnumValues<T>([DynamicallyAccessedMembers(DynamicallyAccessedMemberTypes.PublicFields)] Type enumType) where T : Enum
         {
             var result = new Dictionary<string, object>(StringComparer.OrdinalIgnoreCase);
             foreach (var field in enumType.GetFields(BindingFlags.Public | BindingFlags.Static))

src/Microsoft.OpenApi/Microsoft.OpenApi.csproj

@@ -6,6 +6,8 @@
         <Version>2.0.0-preview4</Version>
         <Description>.NET models with JSON and YAML writers for OpenAPI specification</Description>
         <SignAssembly>true</SignAssembly>
+        <IsTrimmable Condition="$([MSBuild]::IsTargetFrameworkCompatible('$(TargetFramework)','net5.0'))">true</IsTrimmable>
+        <IsAotCompatible Condition="$([MSBuild]::IsTargetFrameworkCompatible('$(TargetFramework)','net8.0'))">true</IsAotCompatible>
         <!-- https://github.com/dotnet/sourcelink/blob/main/docs/README.md#embeduntrackedsources -->
         <EmbedUntrackedSources>true</EmbedUntrackedSources>
         <NoWarn>NU5048</NoWarn>

src/Microsoft.OpenApi/Models/OpenApiSchema.cs

@@ -846,7 +846,11 @@ where Type.Value.HasFlag(flag)
             writer.WriteOptionalCollection(OpenApiConstants.Type, list, (w, s) => w.WriteValue(s));
         }
 
+#if NET5_0_OR_GREATER
+        private static readonly Array jsonSchemaTypeValues = System.Enum.GetValues<JsonSchemaType>();
+#else
         private static readonly Array jsonSchemaTypeValues = System.Enum.GetValues(typeof(JsonSchemaType));
+#endif
 
         private void DowncastTypeArrayToV2OrV3(JsonSchemaType schemaType, IOpenApiWriter writer, OpenApiSpecVersion version)
         {

src/Microsoft.OpenApi/Reader/ParseNodes/MapNode.cs

@@ -8,6 +8,7 @@
 using System.Linq;
 using System.Text.Json;
 using System.Text.Json.Nodes;
+using System.Text.Json.Serialization;
 using Microsoft.OpenApi.Any;
 using Microsoft.OpenApi.Exceptions;
 using Microsoft.OpenApi.Interfaces;
@@ -114,7 +115,7 @@ IEnumerator IEnumerable.GetEnumerator()
 
         public override string GetRaw()
         {
-            var x = JsonSerializer.Serialize(_node);
+            var x = JsonSerializer.Serialize(_node, SourceGenerationContext.Default.JsonObject);
             return x;
         }
 
@@ -176,4 +177,7 @@ public override JsonNode CreateAny()
             return _node;
         }
     }
+
+    [JsonSerializable(typeof(JsonObject))]
+    internal partial class SourceGenerationContext : JsonSerializerContext { }
 }

src/Microsoft.OpenApi/Validations/Rules/RuleHelpers.cs

@@ -52,15 +52,15 @@ public static void ValidateDataTypeMismatch(
             }
 
             // convert value to JsonElement and access the ValueKind property to determine the type.
-            var jsonElement = JsonDocument.Parse(JsonSerializer.Serialize(value)).RootElement;
+            var valueKind = value.GetValueKind();
 
             var type = schema.Type.ToIdentifier();
             var format = schema.Format;
             var nullable = schema.Nullable;
 
             // Before checking the type, check first if the schema allows null.
             // If so and the data given is also null, this is allowed for any type.
-            if (nullable && jsonElement.ValueKind is JsonValueKind.Null)
+            if (nullable && valueKind is JsonValueKind.Null)
             {
                 return;
             }
@@ -70,7 +70,7 @@ public static void ValidateDataTypeMismatch(
                 // It is not against the spec to have a string representing an object value.
                 // To represent examples of media types that cannot naturally be represented in JSON or YAML,
                 // a string value can contain the example with escaping where necessary
-                if (jsonElement.ValueKind is JsonValueKind.String)
+                if (valueKind is JsonValueKind.String)
                 {
                     return;
                 }
@@ -110,7 +110,7 @@ public static void ValidateDataTypeMismatch(
                 // It is not against the spec to have a string representing an array value.
                 // To represent examples of media types that cannot naturally be represented in JSON or YAML,
                 // a string value can contain the example with escaping where necessary
-                if (jsonElement.ValueKind is JsonValueKind.String)
+                if (valueKind is JsonValueKind.String)
                 {
                     return;
                 }
@@ -138,7 +138,7 @@ public static void ValidateDataTypeMismatch(
 
             if (type is "integer" or "number" && format is "int32")
             {
-                if (jsonElement.ValueKind is not JsonValueKind.Number)
+                if (valueKind is not JsonValueKind.Number)
                 {
                     context.CreateWarning(
                         ruleName,
@@ -150,7 +150,7 @@ public static void ValidateDataTypeMismatch(
 
             if (type is "integer" or "number" && format is "int64")
             {
-                if (jsonElement.ValueKind is not JsonValueKind.Number)
+                if (valueKind is not JsonValueKind.Number)
                 {
                     context.CreateWarning(
                        ruleName,
@@ -162,7 +162,7 @@ public static void ValidateDataTypeMismatch(
 
             if (type is "integer")
             {
-                if (jsonElement.ValueKind is not JsonValueKind.Number)
+                if (valueKind is not JsonValueKind.Number)
                 {
                     context.CreateWarning(
                         ruleName,
@@ -174,7 +174,7 @@ public static void ValidateDataTypeMismatch(
 
             if (type is "number" && format is "float")
             {
-                if (jsonElement.ValueKind is not JsonValueKind.Number)
+                if (valueKind is not JsonValueKind.Number)
                 {
                     context.CreateWarning(
                         ruleName,
@@ -186,7 +186,7 @@ public static void ValidateDataTypeMismatch(
 
             if (type is "number" && format is "double")
             {
-                if (jsonElement.ValueKind is not JsonValueKind.Number)
+                if (valueKind is not JsonValueKind.Number)
                 {
                     context.CreateWarning(
                         ruleName,
@@ -198,7 +198,7 @@ public static void ValidateDataTypeMismatch(
 
             if (type is "number")
             {
-                if (jsonElement.ValueKind is not JsonValueKind.Number)
+                if (valueKind is not JsonValueKind.Number)
                 {
                     context.CreateWarning(
                         ruleName,
@@ -210,7 +210,7 @@ public static void ValidateDataTypeMismatch(
 
             if (type is "string" && format is "byte")
             {
-                if (jsonElement.ValueKind is not JsonValueKind.String)
+                if (valueKind is not JsonValueKind.String)
                 {
                     context.CreateWarning(
                         ruleName,
@@ -222,7 +222,7 @@ public static void ValidateDataTypeMismatch(
 
             if (type is "string" && format is "date")
             {
-                if (jsonElement.ValueKind is not JsonValueKind.String)
+                if (valueKind is not JsonValueKind.String)
                 {
                     context.CreateWarning(
                         ruleName,
@@ -234,7 +234,7 @@ public static void ValidateDataTypeMismatch(
 
             if (type is "string" && format is "date-time")
             {
-                if (jsonElement.ValueKind is not JsonValueKind.String)
+                if (valueKind is not JsonValueKind.String)
                 {
                     context.CreateWarning(
                         ruleName,
@@ -246,7 +246,7 @@ public static void ValidateDataTypeMismatch(
 
             if (type is "string" && format is "password")
             {
-                if (jsonElement.ValueKind is not JsonValueKind.String)
+                if (valueKind is not JsonValueKind.String)
                 {
                     context.CreateWarning(
                         ruleName,
@@ -258,7 +258,7 @@ public static void ValidateDataTypeMismatch(
 
             if (type is "string")
             {
-                if (jsonElement.ValueKind is not JsonValueKind.String)
+                if (valueKind is not JsonValueKind.String)
                 {
                     context.CreateWarning(
                         ruleName,
@@ -270,7 +270,7 @@ public static void ValidateDataTypeMismatch(
 
             if (type is "boolean")
             {
-                if (jsonElement.ValueKind is not JsonValueKind.True && jsonElement.ValueKind is not JsonValueKind.False)
+                if (valueKind is not JsonValueKind.True && valueKind is not JsonValueKind.False)
                 {
                     context.CreateWarning(
                         ruleName,

test/Microsoft.OpenApi.Tests/PublicApi/PublicApi.approved.txt

@@ -1,3 +1,4 @@
+[assembly: System.Reflection.AssemblyMetadata("IsTrimmable", "True")]
 [assembly: System.Reflection.AssemblyMetadata("RepositoryUrl", "https://github.com/Microsoft/OpenAPI.NET")]
 [assembly: System.Runtime.CompilerServices.InternalsVisibleTo(@"Microsoft.OpenApi.Readers.Tests, PublicKey=0024000004800000940000000602000000240000525341310004000001000100957cb48387b2a5f54f5ce39255f18f26d32a39990db27cf48737afc6bc62759ba996b8a2bfb675d4e39f3d06ecb55a178b1b4031dcb2a767e29977d88cce864a0d16bfc1b3bebb0edf9fe285f10fffc0a85f93d664fa05af07faa3aad2e545182dbf787e3fd32b56aca95df1a3c4e75dec164a3f1a4c653d971b01ffc39eb3c4")]
 [assembly: System.Runtime.CompilerServices.InternalsVisibleTo(@"Microsoft.OpenApi.Tests, PublicKey=0024000004800000940000000602000000240000525341310004000001000100957cb48387b2a5f54f5ce39255f18f26d32a39990db27cf48737afc6bc62759ba996b8a2bfb675d4e39f3d06ecb55a178b1b4031dcb2a767e29977d88cce864a0d16bfc1b3bebb0edf9fe285f10fffc0a85f93d664fa05af07faa3aad2e545182dbf787e3fd32b56aca95df1a3c4e75dec164a3f1a4c653d971b01ffc39eb3c4")]

test/Microsoft.OpenApi.Trimming.Tests/Microsoft.OpenApi.Trimming.Tests.csproj

@@ -4,17 +4,19 @@
     <TargetFramework>net8.0</TargetFramework>
     <ImplicitUsings>enable</ImplicitUsings>
     <Nullable>enable</Nullable>
+    <PublishTrimmed>true</PublishTrimmed>
     <PublishAot>true</PublishAot>
     <TrimmerSingleWarn>false</TrimmerSingleWarn>
     <TreatWarningsAsErrors>true</TreatWarningsAsErrors>
-    <NoWarn>NU1903</NoWarn>
+    <NoWarn>NU1903; IL3000</NoWarn>
     <IsPackable>false</IsPackable>
   </PropertyGroup>
 
   <ItemGroup>
     <ProjectReference Include="..\..\src\Microsoft.OpenApi\Microsoft.OpenApi.csproj" />
     <TrimmerRootAssembly Include="Microsoft.OpenApi" />
-    <!-- TODO: Microsoft.OpenApi.Readers has not been configured for native AoT. -->
+    <ProjectReference Include="..\..\src\Microsoft.OpenApi.Readers\Microsoft.OpenApi.Readers.csproj" />
+    <TrimmerRootAssembly Include="Microsoft.OpenApi.Readers" />
   </ItemGroup>
 
 </Project>