hot fix for json event input serialization

Signed-off-by: chcurran <82187351+carlitosan@users.noreply.github.com>

Gems/ScriptCanvas/Code/Editor/Nodes/NodeCreateUtils.cpp

@@ -408,7 +408,7 @@ namespace ScriptCanvasEditor::Nodes
         AZ::BehaviorAzEventDescription behaviorAzEventDesc;
         AZ::AttributeReader azEventDescAttributeReader(nullptr, azEventDescAttribute);
         azEventDescAttributeReader.Read<decltype(behaviorAzEventDesc)>(behaviorAzEventDesc);
-        if(behaviorAzEventDesc.m_eventName.empty())
+        if (behaviorAzEventDesc.m_eventName.empty())
         {
             AZ_Error("NodeUtils", false, "Cannot create an AzEvent node with empty event name")
             return {};

Gems/ScriptCanvas/Code/Editor/View/Widgets/NodePalette/NodePaletteModel.cpp

@@ -140,21 +140,10 @@ namespace
         // If the reflected method returns an AZ::Event, reflect it to the SerializeContext
         if (AZ::MethodReturnsAzEventByReferenceOrPointer(method))
         {
-            AZ::SerializeContext* serializeContext{};
-            AZ::ComponentApplicationBus::BroadcastResult(serializeContext, &AZ::ComponentApplicationRequests::GetSerializeContext);
             const AZ::BehaviorParameter* resultParameter = method.GetResult();
-            AZ::SerializeContext::ClassData classData;
+            ScriptCanvas::ReflectEventTypeOnDemand(resultParameter->m_typeId, resultParameter->m_name, resultParameter->m_azRtti);
-            classData.m_name = resultParameter->m_name;
-            classData.m_typeId = resultParameter->m_typeId;
-            classData.m_azRtti = resultParameter->m_azRtti;
-
-            auto EventPlaceholderAnyCreator = [](AZ::SerializeContext*) -> AZStd::any
-            {
-                return AZStd::make_any<AZStd::monostate>();
-            };
-            serializeContext->RegisterType(resultParameter->m_typeId, AZStd::move(classData), EventPlaceholderAnyCreator);
-
         }
+
         nodePaletteModel.RegisterClassNode(categoryPath, behaviorClass ? behaviorClass->m_name : "", name, &method, &behaviorContext, propertyStatus, isOverloaded);
     }
 
@@ -177,19 +166,8 @@ namespace
         // If the reflected method returns an AZ::Event, reflect it to the SerializeContext
         if (AZ::MethodReturnsAzEventByReferenceOrPointer(behaviorMethod))
         {
-            AZ::SerializeContext* serializeContext{};
-            AZ::ComponentApplicationBus::BroadcastResult(serializeContext, &AZ::ComponentApplicationRequests::GetSerializeContext);
             const AZ::BehaviorParameter* resultParameter = behaviorMethod.GetResult();
-            AZ::SerializeContext::ClassData classData;
+            ScriptCanvas::ReflectEventTypeOnDemand(resultParameter->m_typeId, resultParameter->m_name, resultParameter->m_azRtti);
-            classData.m_name = resultParameter->m_name;
-            classData.m_typeId = resultParameter->m_typeId;
-            classData.m_azRtti = resultParameter->m_azRtti;
-
-            auto EventPlaceholderAnyCreator = [](AZ::SerializeContext*) -> AZStd::any
-            {
-                return AZStd::make_any<AZStd::monostate>();
-            };
-            serializeContext->RegisterType(resultParameter->m_typeId, AZStd::move(classData), EventPlaceholderAnyCreator);
 
         }
         nodePaletteModel.RegisterMethodNode(behaviorContext, behaviorMethod);

Gems/ScriptCanvas/Code/Include/ScriptCanvas/Core/Core.cpp

@@ -153,4 +153,22 @@ namespace ScriptCanvas
         grammarVersion = GrammarVersion::Current;
         runtimeVersion = RuntimeVersion::Current;
     }
+
+    void ReflectEventTypeOnDemand(const AZ::TypeId& typeId, AZStd::string_view name, AZ::IRttiHelper* rttiHelper)
+    {
+        AZ::SerializeContext* serializeContext{};
+        AZ::ComponentApplicationBus::BroadcastResult(serializeContext, &AZ::ComponentApplicationRequests::GetSerializeContext);
+        AZ::SerializeContext::ClassData classData;
+        classData.m_name = name.data();
+        classData.m_typeId = typeId;
+        classData.m_azRtti = rttiHelper;
+
+        auto EventPlaceholderAnyCreator = [](AZ::SerializeContext*) -> AZStd::any
+        {
+            return AZStd::make_any<AZStd::monostate>();
+        };
+
+        serializeContext->RegisterType(typeId, AZStd::move(classData), EventPlaceholderAnyCreator);
+    }
+
 }

Gems/ScriptCanvas/Code/Include/ScriptCanvas/Core/Core.h

@@ -279,6 +279,8 @@ namespace ScriptCanvas
         bool m_wasAdded = false;
         AZ::Entity* m_buildEntity = nullptr;
     };
+
+    void ReflectEventTypeOnDemand(const AZ::TypeId& typeId, AZStd::string_view name, AZ::IRttiHelper* rttiHelper = nullptr);
 }
 
 namespace AZStd

Gems/ScriptCanvas/Code/Include/ScriptCanvas/Serialization/DatumSerializer.cpp

@@ -6,12 +6,27 @@
  *
  */
 
+#include <AzCore/RTTI/BehaviorContext.h>
 #include <AzCore/Serialization/Json/JsonSerialization.h>
 #include <ScriptCanvas/Asset/RuntimeAsset.h>
 #include <ScriptCanvas/Serialization/DatumSerializer.h>
 
 using namespace ScriptCanvas;
 
+namespace DatumSerializerCpp
+{
+    bool IsEventInput(const AZ::Uuid& inputType)
+    {
+        AZ::BehaviorContext* behaviorContext = nullptr;
+        AZ::ComponentApplicationBus::BroadcastResult(behaviorContext, &AZ::ComponentApplicationRequests::GetBehaviorContext);
+        AZ_Assert(behaviorContext, "Can't serialize data properly without checking the type, for which we need behavior context!");
+        auto bcClassIter = behaviorContext->m_typeToClassMap.find(inputType);
+        return bcClassIter != behaviorContext->m_typeToClassMap.end()
+            && bcClassIter->second->m_azRtti
+            && bcClassIter->second->m_azRtti->GetGenericTypeId() == azrtti_typeid<AZ::Event>();
+    }
+}
+
 namespace AZ
 {
     AZ_CLASS_ALLOCATOR_IMPL(DatumSerializer, SystemAllocator, 0);
@@ -57,7 +72,7 @@ namespace AZ
             return context.Report
                 ( JSR::Tasks::ReadField
                 , JSR::Outcomes::Missing
-                , "DatumSerializer::Load failed to load the 'isNullPointer'' member");
+                , "DatumSerializer::Load failed to load the 'isNullPointer' member");
         }
 
         if (isNullPointerMember->value.GetBool())
@@ -159,11 +174,13 @@ namespace AZ
             , azrtti_typeid<decltype(inputScriptDataPtr->GetType())>()
             , context));
 
+
         // datum storage begin
         auto inputObjectSource = inputScriptDataPtr->GetAsDanger();
-        outputValue.AddMember("isNullPointer", rapidjson::Value(inputObjectSource == nullptr), context.GetJsonAllocator());
+        const bool isNullPointer = inputObjectSource == nullptr || DatumSerializerCpp::IsEventInput(inputScriptDataPtr->GetType().GetAZType());
+        outputValue.AddMember("isNullPointer", rapidjson::Value(isNullPointer), context.GetJsonAllocator());
 
-        if (inputObjectSource)
+        if (!isNullPointer)
         {
             rapidjson::Value typeValue;
             result.Combine(StoreTypeId(typeValue, inputScriptDataPtr->GetType().GetAZType(), context));