func NewSegment()

in plugins/queue/mmap/segment/segment.go [35:70]

• 32 lines of code
• 11 McCabe index (conditional complexity)

func NewSegment(name string, size int) (*mmap.File, error) {
	name, err := filepath.Abs(name)
	if err != nil {
		return nil, fmt.Errorf("error in getting the absolute path of the segment file : %v", err)
	}
	paths, _ := filepath.Split(name)
	_, err = os.Stat(paths)
	if err != nil && os.IsNotExist(err) && os.MkdirAll(paths, 0o744) != nil {
		return nil, fmt.Errorf("error in creating the parent dirs of the segment file : %v", err)
	}

	file, err := os.OpenFile(name, os.O_CREATE|os.O_RDWR, 0o744)
	if err != nil {
		return nil, fmt.Errorf("error in opening segment file : %v", err)
	}

	stat, err := file.Stat()
	if err != nil {
		return nil, fmt.Errorf("error in reading info of the segment file : %v", err)
	}

	if stat.Size() != int64(size) {
		if file.Truncate(int64(size)) != nil {
			return nil, fmt.Errorf("error in truncating file: %v", err)
		}
	}

	segment, err := mmap.NewSharedFileMmap(file, 0, size, syscall.PROT_READ|syscall.PROT_WRITE)
	if err != nil {
		return nil, fmt.Errorf("error in creating the mmap segment file : %v", err)
	}
	if err := file.Close(); err != nil {
		return nil, fmt.Errorf("error in closing the segment file : %v", err)
	}
	return segment, nil
}