dwelling-upload/pkg/utils/filesize.go

package utils

import (
	"os"
	"path"
	"strconv"
	"strings"

	"github.com/pkg/errors"
)

var sizeSuffixes = [...]string{"B", "KiB", "MiB", "GiB", "TiB"}

// ConvertFileSize converts size in bytes down to biggest units it represents.
// Returns converted size, unit and, a concatenation of size and unit
func ConvertFileSize(size int64) (float64, string, string) {
	idx := 0
	fSize := float64(size)

	for ; fSize >= 1024; fSize /= 1024 {
		idx++
	}

	fSizeStr := strconv.FormatFloat(fSize, 'f', 3, 64)
	fSizeStr = strings.TrimRight(fSizeStr, "0")
	fSizeStr = strings.TrimSuffix(fSizeStr, ".")

	return fSize, sizeSuffixes[idx],
		strings.Join([]string{fSizeStr, sizeSuffixes[idx]}, " ")
}

func DirectorySize(dirPath string) (dirSz int64, err error) {
	dir, err := os.ReadDir(dirPath)
	if err != nil {
		return 0, errors.Wrapf(err, "failed to compute %s directory size", dirPath)
	}

	for _, entry := range dir {
		file, err := os.Stat(path.Join(dirPath, entry.Name()))
		if err != nil {
			return 0, errors.Wrapf(err, "failed to stat a file %s", entry.Name())
		}
		dirSz += file.Size()
	}

	return dirSz, nil
}