func newSorterNode()

in pkg/sorter/sorter.go [174:223]
37 lines of code
7 McCabe index (conditional complexity)

func newSorterNode(instanceType *instancetypes.Details, sortField string) (*sorterNode, error) {
	// some important fields (such as gpu count) can not be accessed directly in the instancetypes.Details
	// struct, so we have special hard-coded flags to handle such cases
	switch sortField {
	case GPUCountField:
		gpuCount := getTotalGpusCount(instanceType)
		return &sorterNode{
			instanceType: instanceType,
			fieldValue:   reflect.ValueOf(gpuCount),
		}, nil
	case InferenceAcceleratorsField:
		acceleratorsCount := getTotalAcceleratorsCount(instanceType)
		return &sorterNode{
			instanceType: instanceType,
			fieldValue:   reflect.ValueOf(acceleratorsCount),
		}, nil
	}

	// convert instance type into json
	jsonInstanceType, err := json.Marshal(instanceType)
	if err != nil {
		return nil, err
	}

	// unmarshal json instance types in order to get proper format
	// for json path parsing
	var jsonData interface{}
	err = json.Unmarshal(jsonInstanceType, &jsonData)
	if err != nil {
		return nil, err
	}

	// get the desired field from the json data based on the passed in
	// json path
	result, err := jsonpath.JsonPathLookup(jsonData, sortField)
	if err != nil {
		// handle case where parent objects in path are null
		// by setting result to nil
		if err.Error() == "get attribute from null object" {
			result = nil
		} else {
			return nil, fmt.Errorf("error during json path lookup: %v", err)
		}
	}

	return &sorterNode{
		instanceType: instanceType,
		fieldValue:   reflect.ValueOf(result),
	}, nil
}