BugFix-FunctionMetadataProvider emits incorrect binding name property value for async functions

sdk/Sdk.Generators/FunctionMetadataProviderGenerator/FunctionMetadataProviderGenerator.Parser.cs

@@ -432,10 +432,10 @@ private bool TryGetReturnTypeBindings(MethodDeclarationSyntax method, SemanticMo
                 }
 
                 if (!SymbolEqualityComparer.Default.Equals(returnTypeSymbol, _knownTypes.VoidType) &&
-                    !SymbolEqualityComparer.Default.Equals(returnTypeSymbol, _knownTypes.TaskType))
+                    !SymbolEqualityComparer.Default.Equals(returnTypeSymbol.OriginalDefinition, _knownTypes.TaskType))
                 {
                     // If there is a Task<T> return type, inspect T, the inner type.
-                    if (SymbolEqualityComparer.Default.Equals(returnTypeSymbol, _knownTypes.TaskOfTType))
+                    if (SymbolEqualityComparer.Default.Equals(returnTypeSymbol.OriginalDefinition, _knownTypes.TaskOfTType))
                     {
                         GenericNameSyntax genericSyntax = (GenericNameSyntax)returnTypeSyntax;
                         var innerTypeSyntax = genericSyntax.TypeArgumentList.Arguments.First(); // Generic task should only have one type argument

sdk/release_notes.md

@@ -14,4 +14,5 @@
 
 ### Microsoft.Azure.Functions.Worker.Sdk.Generators <version>
 
-- Updated source generated versions of FunctionExecutor to use `global::` namespace prefix to avoid ambiguity between namespaces.(#1847)
+- Updated source generated versions of FunctionExecutor to use `global::` namespace prefix to avoid ambiguity between namespaces.(#1847)
+- Fixing the check to determine the function return type for async functions.(#1817)

test/Sdk.Generator.Tests/FunctionMetadataProviderGeneratorTests/IntegratedTriggersAndBindingsTests.cs

@@ -486,7 +486,7 @@ public Task<ImmutableArray<IFunctionMetadata>> GetFunctionMetadataAsync(string d
                             var metadataList = new List<IFunctionMetadata>();
                             var Function0RawBindings = new List<string>();
                             Function0RawBindings.Add(@"{""name"":""myReq"",""type"":""HttpTrigger"",""direction"":""In"",""authLevel"":""Admin"",""methods"":[""get"",""Post""],""route"":""/api2""}");
-                            Function0RawBindings.Add(@"{""name"":""Result"",""type"":""http"",""direction"":""Out""}");
+                            Function0RawBindings.Add(@"{""name"":""$return"",""type"":""http"",""direction"":""Out""}");
 
                             var Function0 = new DefaultFunctionMetadata
                             {
@@ -526,6 +526,127 @@ await TestHelpers.RunTestAsync<FunctionMetadataProviderGenerator>(
                     expectedGeneratedFileName,
                     expectedOutput);
             }
+
+            [Fact]
+            public async Task GenerateMultipleFunctionsMetadataTest()
+            {
+                string inputCode = """
+                using System;
+                using System.Threading.Tasks;
+                using System.Collections.Generic;
+                using Microsoft.Azure.Functions.Worker;
+                using Microsoft.Azure.Functions.Worker.Http;
+
+                namespace FunctionApp
+                {
+                    public class HttpTriggerSimple
+                    {
+                        [Function(nameof(Run))]
+                        public HttpResponseData Run([HttpTrigger(AuthorizationLevel.Anonymous, "get", "post", Route = null)] HttpRequestData req, FunctionContext executionContext)
+                        {
+                            throw new NotImplementedException();
+                        }
+                        [Function(nameof(RunAsync))]
+                        public Task<HttpResponseData> RunAsync([HttpTrigger(AuthorizationLevel.Anonymous, "get", "post")] HttpRequestData req)
+                        {
+                            throw new NotImplementedException();
+                        }
+                        [Function(nameof(RunAsync2))]
+                        public async Task<HttpResponseData> RunAsync2([HttpTrigger(AuthorizationLevel.Anonymous, "get", "post")] HttpRequestData req)
+                        {
+                            throw new NotImplementedException();
+                        }
+                    }
+                }
+                """;
+
+                string expectedGeneratedFileName = $"GeneratedFunctionMetadataProvider.g.cs";
+                string expectedOutput = """
+                // <auto-generated/>
+                using System;
+                using System.Collections.Generic;
+                using System.Collections.Immutable;
+                using System.Text.Json;
+                using System.Threading.Tasks;
+                using Microsoft.Azure.Functions.Worker.Core.FunctionMetadata;
+                using Microsoft.Extensions.DependencyInjection;
+                using Microsoft.Extensions.Hosting;
+
+                namespace Microsoft.Azure.Functions.Worker
+                {
+                    public class GeneratedFunctionMetadataProvider : IFunctionMetadataProvider
+                    {
+                        public Task<ImmutableArray<IFunctionMetadata>> GetFunctionMetadataAsync(string directory)
+                        {
+                            var metadataList = new List<IFunctionMetadata>();
+                            var Function0RawBindings = new List<string>();
+                            Function0RawBindings.Add(@"{""name"":""req"",""type"":""HttpTrigger"",""direction"":""In"",""authLevel"":""Anonymous"",""methods"":[""get"",""post""]}");
+                            Function0RawBindings.Add(@"{""name"":""$return"",""type"":""http"",""direction"":""Out""}");
+
+                            var Function0 = new DefaultFunctionMetadata
+                            {
+                                Language = "dotnet-isolated",
+                                Name = "Run",
+                                EntryPoint = "FunctionApp.HttpTriggerSimple.Run",
+                                RawBindings = Function0RawBindings,
+                                ScriptFile = "TestProject.dll"
+                            };
+                            metadataList.Add(Function0);
+                            var Function1RawBindings = new List<string>();
+                            Function1RawBindings.Add(@"{""name"":""req"",""type"":""HttpTrigger"",""direction"":""In"",""authLevel"":""Anonymous"",""methods"":[""get"",""post""]}");
+                            Function1RawBindings.Add(@"{""name"":""$return"",""type"":""http"",""direction"":""Out""}");
+
+                            var Function1 = new DefaultFunctionMetadata
+                            {
+                                Language = "dotnet-isolated",
+                                Name = "RunAsync",
+                                EntryPoint = "FunctionApp.HttpTriggerSimple.RunAsync",
+                                RawBindings = Function1RawBindings,
+                                ScriptFile = "TestProject.dll"
+                            };
+                            metadataList.Add(Function1);
+                            var Function2RawBindings = new List<string>();
+                            Function2RawBindings.Add(@"{""name"":""req"",""type"":""HttpTrigger"",""direction"":""In"",""authLevel"":""Anonymous"",""methods"":[""get"",""post""]}");
+                            Function2RawBindings.Add(@"{""name"":""$return"",""type"":""http"",""direction"":""Out""}");
+
+                            var Function2 = new DefaultFunctionMetadata
+                            {
+                                Language = "dotnet-isolated",
+                                Name = "RunAsync2",
+                                EntryPoint = "FunctionApp.HttpTriggerSimple.RunAsync2",
+                                RawBindings = Function2RawBindings,
+                                ScriptFile = "TestProject.dll"
+                            };
+                            metadataList.Add(Function2);
+
+                            return Task.FromResult(metadataList.ToImmutableArray());
+                        }
+                    }
+
+                    public static class WorkerHostBuilderFunctionMetadataProviderExtension
+                    {
+                        ///<summary>
+                        /// Adds the GeneratedFunctionMetadataProvider to the service collection.
+                        /// During initialization, the worker will return generated function metadata instead of relying on the Azure Functions host for function indexing.
+                        ///</summary>
+                        public static IHostBuilder ConfigureGeneratedFunctionMetadataProvider(this IHostBuilder builder)
+                        {
+                            builder.ConfigureServices(s => 
+                            {
+                                s.AddSingleton<IFunctionMetadataProvider, GeneratedFunctionMetadataProvider>();
+                            });
+                            return builder;
+                        }
+                    }
+                }
+                """;
+
+                await TestHelpers.RunTestAsync<FunctionMetadataProviderGenerator>(
+                    _referencedExtensionAssemblies,
+                    inputCode,
+                    expectedGeneratedFileName,
+                    expectedOutput);
+            }
         }
     }
 }