void FWebJSScripting::InvokeJSFunction(FGuid FunctionId, int32 ArgCount, FWebJSParam Arguments[], bool bIsError)
{
CefRefPtr<CefListValue> FunctionArguments = CefListValue::Create();
for ( int32 i=0; i<ArgCount; i++)
{
SetConverted(FunctionArguments, i, Arguments[i]);
}
InvokeJSFunction(FunctionId, FunctionArguments, bIsError);
}
void FWebJSScripting::InvokeJSErrorResult(FGuid FunctionId, const FString& Error)
{
FWebJSParam Arguments[1] = {FWebJSParam(Error)};
InvokeJSFunction(FunctionId, 1, Arguments, true);
}
bool FWebJSScripting::HandleExecuteUObjectMethodMessage(CefRefPtr<CefListValue> MessageArguments)
{
FGuid ObjectKey;
// Message arguments are Name, Value, bGlobal
if (MessageArguments->GetSize() != 4
|| MessageArguments->GetType(0) != VTYPE_STRING
|| MessageArguments->GetType(1) != VTYPE_STRING
|| MessageArguments->GetType(2) != VTYPE_STRING
|| MessageArguments->GetType(3) != VTYPE_LIST
)
{
// Wrong message argument types or count
return false;
}
if (!FGuid::Parse(FString(MessageArguments->GetString(0).ToWString().c_str()), ObjectKey))
{
// Invalid GUID
return false;
}
// Get the promise callback and use that to report any results from executing this function.
FGuid ResultCallbackId;
if (!FGuid::Parse(FString(MessageArguments->GetString(2).ToWString().c_str()), ResultCallbackId))
{
// Invalid GUID
return false;
}
UObject* Object = GuidToPtr(ObjectKey);
if (Object == nullptr)
{
// Unknown uobject id
InvokeJSErrorResult(ResultCallbackId, TEXT("Unknown UObject ID"));
return true;
}
FName MethodName = MessageArguments->GetString(1).ToWString().c_str();
UFunction* Function = Object->FindFunction(MethodName);
if (!Function)
{
InvokeJSErrorResult(ResultCallbackId, TEXT("Unknown UObject Function"));
return true;
}
// Coerce arguments to function arguments.
uint16 ParamsSize = Function->ParmsSize;
TArray<uint8> Params;
UProperty* ReturnParam = nullptr;
// Convert cef argument list to a dictionary, so we can use FStructDeserializer to convert it for us
CefRefPtr<CefDictionaryValue> NamedArgs = CefDictionaryValue::Create();
{
int32 CurrentArg = 0;
CefRefPtr<CefListValue> CefArgs = MessageArguments->GetList(3);
for ( TFieldIterator<UProperty> It(Function); It; ++It )
{
UProperty* Param = *It;
if (Param->PropertyFlags & CPF_Parm)
{
if (Param->PropertyFlags & CPF_ReturnParm)
{
ReturnParam = Param;
}
else
{
CopyContainerValue(NamedArgs, CefArgs, CefString(*Param->GetName()), CurrentArg);
CurrentArg++;
}
}
}
if (ParamsSize > 0)
{
// UFunction is a subclass of UStruct, so we can treat the arguments as a struct for deserialization
UStruct* TypeInfo = Cast<UStruct>(Function);
Params.AddUninitialized(ParamsSize);
TypeInfo->InitializeStruct(Params.GetData());
FWebJSStructDeserializerBackend Backend = FWebJSStructDeserializerBackend(SharedThis(this), NamedArgs);
FStructDeserializer::Deserialize(Params.GetData(), *TypeInfo, Backend);
}
}
Object->ProcessEvent(Function, Params.GetData());
if ( ReturnParam )
{
FWebJSParam Results[1] = {ConvertResult(ReturnParam, Params.GetData())};
InvokeJSFunction(ResultCallbackId, 1, Results, false);
}
else
{
InvokeJSFunction(ResultCallbackId, 0, nullptr, false);
}
return true;
}
void FWebJSScripting::InvokeJSErrorResult(FGuid FunctionId, const FString& Error)
{
CefRefPtr<CefListValue> FunctionArguments = CefListValue::Create();
FunctionArguments->SetString(0, *Error);
InvokeJSFunction(FunctionId, FunctionArguments, true);
}
bool FWebJSScripting::HandleExecuteUObjectMethodMessage(CefRefPtr<CefListValue> MessageArguments)
{
FGuid ObjectKey;
// Message arguments are Name, Value, bGlobal
if (MessageArguments->GetSize() != 4
|| MessageArguments->GetType(0) != VTYPE_STRING
|| MessageArguments->GetType(1) != VTYPE_STRING
|| MessageArguments->GetType(2) != VTYPE_STRING
|| MessageArguments->GetType(3) != VTYPE_LIST
)
{
// Wrong message argument types or count
return false;
}
if (!FGuid::Parse(FString(MessageArguments->GetString(0).ToWString().c_str()), ObjectKey))
{
// Invalid GUID
return false;
}
// Get the promise callback and use that to report any results from executing this function.
FGuid ResultCallbackId;
if (!FGuid::Parse(FString(MessageArguments->GetString(2).ToWString().c_str()), ResultCallbackId))
{
// Invalid GUID
return false;
}
UObject* Object = GuidToPtr(ObjectKey);
if (Object == nullptr)
{
// Unknown uobject id
InvokeJSErrorResult(ResultCallbackId, TEXT("Unknown UObject ID"));
return true;
}
FName MethodName = MessageArguments->GetString(1).ToWString().c_str();
UFunction* Function = Object->FindFunction(MethodName);
if (!Function)
{
InvokeJSErrorResult(ResultCallbackId, TEXT("Unknown UObject Function"));
return true;
}
// Coerce arguments to function arguments.
uint16 ParamsSize = Function->ParmsSize;
TArray<uint8> Params;
UProperty* ReturnParam = nullptr;
UProperty* PromiseParam = nullptr;
// Convert cef argument list to a dictionary, so we can use FStructDeserializer to convert it for us
if (ParamsSize > 0)
{
CefRefPtr<CefDictionaryValue> NamedArgs = CefDictionaryValue::Create();
int32 CurrentArg = 0;
CefRefPtr<CefListValue> CefArgs = MessageArguments->GetList(3);
for ( TFieldIterator<UProperty> It(Function); It; ++It )
{
UProperty* Param = *It;
if (Param->PropertyFlags & CPF_Parm)
{
if (Param->PropertyFlags & CPF_ReturnParm)
{
ReturnParam = Param;
}
else
{
UStructProperty *StructProperty = Cast<UStructProperty>(Param);
if (StructProperty && StructProperty->Struct->IsChildOf(FWebJSResponse::StaticStruct()))
{
PromiseParam = Param;
}
else
{
CopyContainerValue(NamedArgs, CefArgs, CefString(*Param->GetName()), CurrentArg);
CurrentArg++;
}
}
}
}
// UFunction is a subclass of UStruct, so we can treat the arguments as a struct for deserialization
Params.AddUninitialized(ParamsSize);
Function->InitializeStruct(Params.GetData());
FWebJSStructDeserializerBackend Backend = FWebJSStructDeserializerBackend(SharedThis(this), NamedArgs);
FStructDeserializer::Deserialize(Params.GetData(), *Function, Backend);
}
if (PromiseParam)
{
FWebJSResponse* PromisePtr = PromiseParam->ContainerPtrToValuePtr<FWebJSResponse>(Params.GetData());
if (PromisePtr)
{
*PromisePtr = FWebJSResponse(SharedThis(this), ResultCallbackId);
}
}
Object->ProcessEvent(Function, Params.GetData());
CefRefPtr<CefListValue> Results = CefListValue::Create();
if ( ! PromiseParam ) // If PromiseParam is set, we assume that the UFunction will ensure it is called with the result
{
if ( ReturnParam )
{
FStructSerializerPolicies ReturnPolicies;
ReturnPolicies.PropertyFilter = [&](const UProperty* CandidateProperty, const UProperty* ParentProperty)
{
return ParentProperty != nullptr || CandidateProperty == ReturnParam;
};
FWebJSStructSerializerBackend ReturnBackend(SharedThis(this));
FStructSerializer::Serialize(Params.GetData(), *Function, ReturnBackend, ReturnPolicies);
CefRefPtr<CefDictionaryValue> ResultDict = ReturnBackend.GetResult();
// Extract the single return value from the serialized dictionary to an array
CopyContainerValue(Results, ResultDict, 0, CefString(*ReturnParam->GetName()));
}
InvokeJSFunction(ResultCallbackId, Results, false);
}
return true;
}