Add OpenAPI and Swagger support

Fix for async Task flows, using deferred results
2026-07-16 22:19:29 +00:00 · 2025-05-22 15:38:07 +02:00
parent c429a55e8e
commit 48758ef5e1
4 changed files with 265 additions and 90 deletions
@@ -0,0 +1,48 @@
+using Microsoft.CodeAnalysis;
+using Sybil;
+using System;
+
+namespace Net.Sdk.Web.Extensions.SourceGenerators;
+
+[Generator(LanguageNames.CSharp)]
+#nullable enable
+public class DeferredResultGenerator : IIncrementalGenerator
+{
+    public void Initialize(IncrementalGeneratorInitializationContext context)
+    {
+        context.RegisterPostInitializationOutput(GenerateRouteFilterAttribute);
+    }
+
+    private static void GenerateRouteFilterAttribute(IncrementalGeneratorPostInitializationContext context)
+    {
+        var builder = SyntaxBuilder.CreateCompilationUnit()
+                .WithNamespace(
+                SyntaxBuilder.CreateNamespace(Constants.Namespace)
+                    .WithUsing(Constants.UsingSystemThreading)
+                    .WithUsing(Constants.UsingMicrosoftAspNetCoreHttp)
+                    .WithClass(SyntaxBuilder.CreateClass(Constants.DeferredResultClass)
+                        .WithBaseClass(Constants.IResultTypeName)
+                        .WithModifier(Constants.Public)
+                        .WithModifier(Constants.Sealed)
+                        .WithField(SyntaxBuilder.CreateField($"Task<{Constants.IResultInterface}>", "inner")
+                            .WithModifier(Constants.Public)
+                            .WithModifier(Constants.Readonly))
+                        .WithConstructor(SyntaxBuilder.CreateConstructor(Constants.DeferredResultClass)
+                            .WithModifier(Constants.Public)
+                            .WithParameter($"Task<{Constants.IResultInterface}>", "inner")
+                            .WithBody("this.inner = inner;"))
+                        .WithMethod(SyntaxBuilder.CreateMethod(Constants.Task, Constants.ExecuteAsyncMethodName)
+                            .WithParameter("HttpContext", "httpContext")
+                            .WithModifier(Constants.Public)
+                            .WithModifier(Constants.Async)
+                            .WithBody(@$"
+        var result = await this.inner;
+        await result.ExecuteAsync(httpContext);"))));
+
+        var syntax = builder.Build();
+        var source = syntax.ToFullString();
+        context.AddSource($"{Constants.DeferredResultClass}.g", $"{source}");
+    }
+}
+
+#nullable disable