Add trim support for Amazon.Lambda.Annotations (#1610)

Author: normj

Libraries/src/Amazon.Lambda.Annotations.SourceGenerator/Generator.cs

@@ -162,9 +162,9 @@ public void Execute(GeneratorExecutionContext context)
                         }
                     }
 
-                    var serializerString = GetSerializerAttribute(context, lambdaMethodModel);
+                    var serializerInfo = GetSerializerInfoAttribute(context, lambdaMethodModel);
 
-                    var model = LambdaFunctionModelBuilder.Build(lambdaMethodModel, configureMethodModel, context, isExecutable, serializerString, defaultRuntime);
+                    var model = LambdaFunctionModelBuilder.Build(lambdaMethodModel, configureMethodModel, context, isExecutable, serializerInfo, defaultRuntime);
 
                     // If there are more than one event, report them as errors
                     if (model.LambdaMethod.Events.Count > 1)
@@ -334,9 +334,10 @@ private bool HasSerializerAttribute(GeneratorExecutionContext context, IMethodSy
             return methodModel.ContainingAssembly.HasAttribute(context, TypeFullNames.LambdaSerializerAttribute);
         }
 
-        private string GetSerializerAttribute(GeneratorExecutionContext context, IMethodSymbol methodModel)
+        private LambdaSerializerInfo GetSerializerInfoAttribute(GeneratorExecutionContext context, IMethodSymbol methodModel)
         {
             var serializerString = DEFAULT_LAMBDA_SERIALIZER;
+            string serializerJsonContext = null;
 
             ISymbol symbol = null;
 
@@ -357,19 +358,24 @@ private string GetSerializerAttribute(GeneratorExecutionContext context, IMethod
             // Else return the default serializer.
             else
             {
-                return serializerString;
+                return new LambdaSerializerInfo(serializerString, serializerJsonContext);
             }
 
             var attribute = symbol.GetAttributes().FirstOrDefault(attr => attr.AttributeClass.Name == TypeFullNames.LambdaSerializerAttributeWithoutNamespace);
 
             var serializerValue = attribute.ConstructorArguments.FirstOrDefault(kvp => kvp.Type.Name == nameof(Type)).Value;
 
+            if(serializerValue is INamedTypeSymbol typeSymbol && typeSymbol.Name.Contains("SourceGeneratorLambdaJsonSerializer") && typeSymbol.TypeArguments.Length == 1)
+            {
+                serializerJsonContext = typeSymbol.TypeArguments[0].ToString();
+            }
+
             if (serializerValue != null)
             {
                 serializerString = serializerValue.ToString();
             }
 
-            return serializerString;
+            return new LambdaSerializerInfo(serializerString, serializerJsonContext);
         }
 
         public void Initialize(GeneratorInitializationContext context)

Libraries/src/Amazon.Lambda.Annotations.SourceGenerator/Models/LambdaFunctionModel.cs

@@ -34,8 +34,8 @@ public class LambdaFunctionModel : ILambdaFunctionSerializable
         /// <summary>
         /// Gets or sets fully qualified name of the serializer used for serialization or deserialization.
         /// </summary>
-        public string Serializer { get; set; } =
-            "Amazon.Lambda.Serialization.SystemTextJson.DefaultLambdaJsonSerializer";
+        public LambdaSerializerInfo SerializerInfo { get; set; } =
+            new LambdaSerializerInfo("Amazon.Lambda.Serialization.SystemTextJson.DefaultLambdaJsonSerializer", null);
 
         /// <summary>
         /// Gets or sets if the output is an executable.

Libraries/src/Amazon.Lambda.Annotations.SourceGenerator/Models/LambdaFunctionModelBuilder.cs

@@ -9,15 +9,15 @@ namespace Amazon.Lambda.Annotations.SourceGenerator.Models
     /// </summary>
     public static class LambdaFunctionModelBuilder
     {
-        public static LambdaFunctionModel Build(IMethodSymbol lambdaMethodSymbol, IMethodSymbol configureMethodSymbol, GeneratorExecutionContext context, bool isExecutable, string serializer, string runtime)
+        public static LambdaFunctionModel Build(IMethodSymbol lambdaMethodSymbol, IMethodSymbol configureMethodSymbol, GeneratorExecutionContext context, bool isExecutable, LambdaSerializerInfo serializerInfo, string runtime)
         {
             var lambdaMethod = LambdaMethodModelBuilder.Build(lambdaMethodSymbol, configureMethodSymbol, context);
             var generatedMethod = GeneratedMethodModelBuilder.Build(lambdaMethodSymbol, configureMethodSymbol, lambdaMethod, context);
             var model = new LambdaFunctionModel()
             {
                 GeneratedMethod = generatedMethod,
                 LambdaMethod = lambdaMethod,
-                Serializer = serializer,
+                SerializerInfo = serializerInfo,
                 StartupType = configureMethodSymbol != null ? TypeModelBuilder.Build(configureMethodSymbol.ContainingType, context) : null,
                 SourceGeneratorVersion = context.Compilation
                     .ReferencedAssemblyNames.FirstOrDefault(x => string.Equals(x.Name, "Amazon.Lambda.Annotations"))

Libraries/src/Amazon.Lambda.Annotations.SourceGenerator/Models/LambdaSerializerInfo.cs

@@ -0,0 +1,33 @@
+using System;
+using System.Collections.Generic;
+using System.Text;
+
+namespace Amazon.Lambda.Annotations.SourceGenerator.Models
+{
+    /// <summary>
+    /// Information for the registered ILambdaSerializer in the Lambda project.
+    /// </summary>
+    public class LambdaSerializerInfo
+    {
+        /// <summary>
+        /// Construct an instance of LambdaSerializerInfo
+        /// </summary>
+        /// <param name="serializerName"></param>
+        /// <param name="serializerJsonContextName"></param>
+        public LambdaSerializerInfo(string serializerName, string serializerJsonContextName)
+        {
+            SerializerName = serializerName;
+            SerializerJsonContextName = serializerJsonContextName;
+        }
+
+        /// <summary>
+        /// The full name of the type registered as the ILambdaSerializer.
+        /// </summary>
+        public string SerializerName { get; }
+
+        /// <summary>
+        /// The full name of the type used as the generic parameter of the SourceGeneratorLambdaJsonSerializer.
+        /// </summary>
+        public string SerializerJsonContextName { get; }   
+    }
+}