Human-friendly file-size utils

[thclark]

Code presently in amy.utils.files should be refactored to the Octue SDK utils, allowing us to present friendly file sizes for datasets and datafiles:

def size_kb(size_bytes):
    if not size_bytes:
        return 0
    return size_bytes / 1024


def size_mb(size_bytes):
    if not size_bytes:
        return 0
    return size_bytes / 1048576


def size_gb(size_bytes):
    if not size_bytes:
        return 0
    return size_bytes / 1073741824


def size_tb(size_bytes):
    if not size_bytes:
        return 0
    return size_bytes / 1099511627776


def size_str(size_bytes, fmt='%.02f '):
    """ Return sensible human formatted size string
    :param size_bytes: file/dataset size in bytes
    :param fmt: string format specifier for the floating point size. default '%.02f '
    :return: str
    """
    if size_bytes >= 1099511627776:
        return fmt % size_tb(size_bytes) + 'tb'
    if size_bytes >= 1073741824:
        return fmt % size_gb(size_bytes) + 'gb'
    if size_bytes >= 1048576:
        return fmt % size_mb(size_bytes) + 'mb'
    if size_bytes >= 1024:
        return fmt % size_kb(size_bytes) + 'kb'
    return fmt % size_bytes + 'b'