Automatically set partial support

Check if the stack support partial writes on a local feature function, and automatically set it accordingly

api/function.go

@@ -21,6 +21,8 @@ type FunctionDataCmdInterface interface {
 type FunctionDataInterface interface {
 	// Get the function type
 	FunctionType() model.FunctionType
+	// Return if this function supports partial writes
+	SupportsPartialWrite() bool
 	// Get a copy of the functions data
 	DataCopyAny() any
 	// Update the functions data

spine/feature_local.go

@@ -76,7 +76,15 @@ func (r *FeatureLocal) AddFunctionType(function model.FunctionType, read, write
 	if r.operations[function] != nil {
 		return
 	}
-	r.operations[function] = NewOperations(read, false, write, write)
+	writePartial := false
+	if write {
+		// partials are not supported on all features and functions, so check if this function supports it
+		if fctData := r.functionData(function); fctData != nil {
+			writePartial = fctData.SupportsPartialWrite()
+		}
+	}
+	// partial reads are currently not supported!
+	r.operations[function] = NewOperations(read, false, write, writePartial)
 
 	if r.role == model.RoleTypeServer &&
 		r.ftype == model.FeatureTypeTypeDeviceDiagnosis &&

spine/function_data.go

@@ -31,6 +31,10 @@ func (r *FunctionData[T]) FunctionType() model.FunctionType {
 	return r.functionType
 }
 
+func (r *FunctionData[T]) SupportsPartialWrite() bool {
+	return util.Implements[T, model.Updater]()
+}
+
 func (r *FunctionData[T]) DataCopy() *T {
 	r.mux.Lock()
 	defer r.mux.Unlock()
@@ -58,8 +62,7 @@ func (r *FunctionData[T]) UpdateData(remoteWrite bool, newData *T, filterPartial
 		return nil
 	}
 
-	supported := util.Implements[T, model.Updater]()
-	if !supported {
+	if !r.SupportsPartialWrite() {
 		return model.NewErrorTypeFromString(fmt.Sprintf("partial updates are not supported for type '%s'", util.Type[T]().Name()))
 	}
 

spine/function_data_test.go

@@ -82,6 +82,14 @@ func TestFunctionData_UpdateDataPartial_Supported(t *testing.T) {
 	functionType := model.FunctionTypeHvacOverrunListData
 	sut := NewFunctionData[model.HvacOverrunListDataType](functionType)
 
+	ok := sut.SupportsPartialWrite()
+	assert.True(t, ok)
+
 	err := sut.UpdateData(false, newData, &model.FilterType{CmdControl: &model.CmdControlType{Partial: &model.ElementTagType{}}}, nil)
 	assert.Nil(t, err)
+
+	functionType = model.FunctionTypeNetworkManagementAddNodeCall
+	sut2 := NewFunctionData[model.NetworkManagementAddNodeCallType](functionType)
+	ok = sut2.SupportsPartialWrite()
+	assert.False(t, ok)
 }