FIX: Actor source generator generates invalid code for generic interfaces

examples/GeneratedActor/ActorClient/IGenericClientActor.cs

@@ -0,0 +1,27 @@
+// ------------------------------------------------------------------------
+// Copyright 2023 The Dapr Authors
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//     http://www.apache.org/licenses/LICENSE-2.0
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+// ------------------------------------------------------------------------
+
+using Dapr.Actors.Generators;
+
+namespace GeneratedActor
+{
+    [GenerateActorClient]
+    internal interface IGenericClientActor<TGenericType1, TGenericType2>
+    {
+        [ActorMethod(Name = "GetState")]
+        Task<TGenericType1> GetStateAsync(CancellationToken cancellationToken = default);
+
+        [ActorMethod(Name = "SetState")]
+        Task SetStateAsync(TGenericType2 state, CancellationToken cancellationToken = default);
+    }
+}

src/Dapr.Actors.Generators/ActorClientGenerator.cs

@@ -161,12 +161,23 @@ private static void GenerateActorClientCode(SourceProductionContext context, Act
                 .Append(SyntaxKind.SealedKeyword)
                 .Select(sk => SyntaxFactory.Token(sk));
 
-            var actorClientClassDeclaration = SyntaxFactory.ClassDeclaration(descriptor.ClientTypeName)
-                .WithModifiers(SyntaxFactory.TokenList(actorClientClassModifiers))
-                .WithMembers(SyntaxFactory.List(actorMembers))
-                .WithBaseList(SyntaxFactory.BaseList(
-                    SyntaxFactory.Token(SyntaxKind.ColonToken),
-                    SyntaxFactory.SeparatedList<BaseTypeSyntax>(new[] { actorClientBaseInterface })));
+            var actorClientClassTypeParameters = descriptor.InterfaceType.TypeParameters
+                .Select(x => SyntaxFactory.TypeParameter(x.ToString()));
+
+            var actorClientClassDeclaration = (actorClientClassTypeParameters.Count() == 0)
+                ? SyntaxFactory.ClassDeclaration(descriptor.ClientTypeName)
+                    .WithModifiers(SyntaxFactory.TokenList(actorClientClassModifiers))
+                    .WithMembers(SyntaxFactory.List(actorMembers))
+                    .WithBaseList(SyntaxFactory.BaseList(
+                        SyntaxFactory.Token(SyntaxKind.ColonToken),
+                        SyntaxFactory.SeparatedList<BaseTypeSyntax>(new[] { actorClientBaseInterface })))
+                : SyntaxFactory.ClassDeclaration(descriptor.ClientTypeName)
+                    .WithModifiers(SyntaxFactory.TokenList(actorClientClassModifiers))
+                    .WithTypeParameterList(SyntaxFactory.TypeParameterList(SyntaxFactory.SeparatedList(actorClientClassTypeParameters)))
+                    .WithMembers(SyntaxFactory.List(actorMembers))
+                    .WithBaseList(SyntaxFactory.BaseList(
+                        SyntaxFactory.Token(SyntaxKind.ColonToken),
+                        SyntaxFactory.SeparatedList<BaseTypeSyntax>(new[] { actorClientBaseInterface })));
 
             var namespaceDeclaration = SyntaxFactory.NamespaceDeclaration(SyntaxFactory.ParseName(descriptor.NamespaceName))
                 .WithMembers(SyntaxFactory.List<MemberDeclarationSyntax>(new[] { actorClientClassDeclaration }))

test/Dapr.Actors.Generators.Test/ActorClientGeneratorTests.cs

@@ -168,6 +168,92 @@ public System.Threading.Tasks.Task TestMethod()
         await CreateTest(originalSource, "Test.TestActorClient.g.cs", generatedSource).RunAsync();
     }
 
+    [Fact]
+    public async Task TestSingleGenericInternalInterface()
+    {
+        var originalSource = @"
+using Dapr.Actors.Generators;
+using System.Threading.Tasks;
+
+namespace Test
+{
+    [GenerateActorClient]
+    internal interface ITestActor<TGenericType>
+    {
+        Task TestMethod();
+    }
+}";
+
+        var generatedSource = @"// <auto-generated/>
+#nullable enable
+namespace Test
+{
+    internal sealed class TestActorClient<TGenericType> : Test.ITestActor<TGenericType>
+    {
+        private readonly Dapr.Actors.Client.ActorProxy actorProxy;
+        public TestActorClient(Dapr.Actors.Client.ActorProxy actorProxy)
+        {
+            if (actorProxy is null)
+            {
+                throw new System.ArgumentNullException(nameof(actorProxy));
+            }
+
+            this.actorProxy = actorProxy;
+        }
+
+        public System.Threading.Tasks.Task TestMethod()
+        {
+            return this.actorProxy.InvokeMethodAsync(""TestMethod"");
+        }
+    }
+}";
+
+        await CreateTest(originalSource, "Test.TestActorClient.g.cs", generatedSource).RunAsync();
+    }
+
+    [Fact]
+    public async Task TestMultipleGenericsInternalInterface()
+    {
+        var originalSource = @"
+using Dapr.Actors.Generators;
+using System.Threading.Tasks;
+
+namespace Test
+{
+    [GenerateActorClient]
+    internal interface ITestActor<TGenericType1, TGenericType2>
+    {
+        Task TestMethod();
+    }
+}";
+
+        var generatedSource = @"// <auto-generated/>
+#nullable enable
+namespace Test
+{
+    internal sealed class TestActorClient<TGenericType1, TGenericType2> : Test.ITestActor<TGenericType1, TGenericType2>
+    {
+        private readonly Dapr.Actors.Client.ActorProxy actorProxy;
+        public TestActorClient(Dapr.Actors.Client.ActorProxy actorProxy)
+        {
+            if (actorProxy is null)
+            {
+                throw new System.ArgumentNullException(nameof(actorProxy));
+            }
+
+            this.actorProxy = actorProxy;
+        }
+
+        public System.Threading.Tasks.Task TestMethod()
+        {
+            return this.actorProxy.InvokeMethodAsync(""TestMethod"");
+        }
+    }
+}";
+
+        await CreateTest(originalSource, "Test.TestActorClient.g.cs", generatedSource).RunAsync();
+    }
+
     [Fact]
     public async Task TestRenamedClient()
     {
@@ -211,6 +297,92 @@ public System.Threading.Tasks.Task TestMethod()
         await CreateTest(originalSource, "Test.MyTestActorClient.g.cs", generatedSource).RunAsync();
     }
 
+    [Fact]
+    public async Task TestSingleGenericRenamedClient()
+    {
+        var originalSource = @"
+using Dapr.Actors.Generators;
+using System.Threading.Tasks;
+
+namespace Test
+{
+    [GenerateActorClient(Name = ""MyTestActorClient"")]
+    internal interface ITestActor<TGenericType>
+    {
+        Task TestMethod();
+    }
+}";
+
+        var generatedSource = @"// <auto-generated/>
+#nullable enable
+namespace Test
+{
+    internal sealed class MyTestActorClient<TGenericType> : Test.ITestActor<TGenericType>
+    {
+        private readonly Dapr.Actors.Client.ActorProxy actorProxy;
+        public MyTestActorClient(Dapr.Actors.Client.ActorProxy actorProxy)
+        {
+            if (actorProxy is null)
+            {
+                throw new System.ArgumentNullException(nameof(actorProxy));
+            }
+
+            this.actorProxy = actorProxy;
+        }
+
+        public System.Threading.Tasks.Task TestMethod()
+        {
+            return this.actorProxy.InvokeMethodAsync(""TestMethod"");
+        }
+    }
+}";
+
+        await CreateTest(originalSource, "Test.MyTestActorClient.g.cs", generatedSource).RunAsync();
+    }
+
+    [Fact]
+    public async Task TestMultipleGenericsRenamedClient()
+    {
+        var originalSource = @"
+using Dapr.Actors.Generators;
+using System.Threading.Tasks;
+
+namespace Test
+{
+    [GenerateActorClient(Name = ""MyTestActorClient"")]
+    internal interface ITestActor<TGenericType1, TGenericType2>
+    {
+        Task TestMethod();
+    }
+}";
+
+        var generatedSource = @"// <auto-generated/>
+#nullable enable
+namespace Test
+{
+    internal sealed class MyTestActorClient<TGenericType1, TGenericType2> : Test.ITestActor<TGenericType1, TGenericType2>
+    {
+        private readonly Dapr.Actors.Client.ActorProxy actorProxy;
+        public MyTestActorClient(Dapr.Actors.Client.ActorProxy actorProxy)
+        {
+            if (actorProxy is null)
+            {
+                throw new System.ArgumentNullException(nameof(actorProxy));
+            }
+
+            this.actorProxy = actorProxy;
+        }
+
+        public System.Threading.Tasks.Task TestMethod()
+        {
+            return this.actorProxy.InvokeMethodAsync(""TestMethod"");
+        }
+    }
+}";
+
+        await CreateTest(originalSource, "Test.MyTestActorClient.g.cs", generatedSource).RunAsync();
+    }
+
     [Fact]
     public async Task TestCustomNamespace()
     {