func memoryData()

in metric/system/cgroup/cgv2/memory.go [170:211]
32 lines of code
7 McCabe index (conditional complexity)

func memoryData(path, file string) (MemoryData, error) {

	// root cgroups won't have these files.
	// If .high doesn't exist, assume the rest don't either.
	_, err := os.Stat(filepath.Join(path, file+".high"))
	if errors.Is(err, os.ErrNotExist) {
		return MemoryData{}, nil
	}

	data := MemoryData{}
	// High and max can be set to "max", which means "off"
	lowMetric, err := cgcommon.ParseUintFromFile(filepath.Join(path, file+".low"))
	if err != nil {
		return data, fmt.Errorf("error reading %s.low file: %w", file, err)
	}

	highMetric, err := maxOrValue(path, file+".high")
	if err != nil {
		return data, fmt.Errorf("error parsing %s.high file: %w", file, err)
	}

	maxMetric, err := maxOrValue(path, file+".max")
	if err != nil {
		return data, fmt.Errorf("error parsing %s.max file: %w", file, err)
	}

	currentMetric, err := cgcommon.ParseUintFromFile(filepath.Join(path, file+".current"))
	if err != nil {
		return data, fmt.Errorf("error reading %s.current file: %w", file, err)
	}

	data.Low.Bytes = lowMetric
	data.High.Bytes = highMetric
	data.Max.Bytes = maxMetric
	data.Usage.Bytes = currentMetric
	data.Events, err = fetchEventsFile(path, file+".events")
	if err != nil {
		return data, fmt.Errorf("error fetching events file for %s: %w", file, err)
	}

	return data, nil
}