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# -*- coding: utf-8 -*- # Copyright (c) 2019 Ansible Project # Simplified BSD License (see licenses/simplified_bsd.txt or https://opensource.org/licenses/BSD-2-Clause) from __future__ import absolute_import, division, print_function __metaclass__ = type import re from ansible.module_utils.six import iteritems SIZE_RANGES = { 'Y': 1 << 80, 'Z': 1 << 70, 'E': 1 << 60, 'P': 1 << 50, 'T': 1 << 40, 'G': 1 << 30, 'M': 1 << 20, 'K': 1 << 10, 'B': 1, } def lenient_lowercase(lst): """Lowercase elements of a list. If an element is not a string, pass it through untouched. """ lowered = [] for value in lst: try: lowered.append(value.lower()) except AttributeError: lowered.append(value) return lowered def human_to_bytes(number, default_unit=None, isbits=False): """Convert number in string format into bytes (ex: '2K' => 2048) or using unit argument. example: human_to_bytes('10M') <=> human_to_bytes(10, 'M'). When isbits is False (default), converts bytes from a human-readable format to integer. example: human_to_bytes('1MB') returns 1048576 (int). The function expects 'B' (uppercase) as a byte identifier passed as a part of 'name' param string or 'unit', e.g. 'MB'/'KB'/etc. (except when the identifier is single 'b', it is perceived as a byte identifier too). if 'Mb'/'Kb'/... is passed, the ValueError will be rased. When isbits is True, converts bits from a human-readable format to integer. example: human_to_bytes('1Mb', isbits=True) returns 8388608 (int) - string bits representation was passed and return as a number or bits. The function expects 'b' (lowercase) as a bit identifier, e.g. 'Mb'/'Kb'/etc. if 'MB'/'KB'/... is passed, the ValueError will be rased. """ m = re.search(r'^\s*(\d*\.?\d*)\s*([A-Za-z]+)?', str(number), flags=re.IGNORECASE) if m is None: raise ValueError("human_to_bytes() can't interpret following string: %s" % str(number)) try: num = float(m.group(1)) except Exception: raise ValueError("human_to_bytes() can't interpret following number: %s (original input string: %s)" % (m.group(1), number)) unit = m.group(2) if unit is None: unit = default_unit if unit is None: ''' No unit given, returning raw number ''' return int(round(num)) range_key = unit[0].upper() try: limit = SIZE_RANGES[range_key] except Exception: raise ValueError("human_to_bytes() failed to convert %s (unit = %s). The suffix must be one of %s" % (number, unit, ", ".join(SIZE_RANGES.keys()))) # default value unit_class = 'B' unit_class_name = 'byte' # handling bits case if isbits: unit_class = 'b' unit_class_name = 'bit' # check unit value if more than one character (KB, MB) if len(unit) > 1: expect_message = 'expect %s%s or %s' % (range_key, unit_class, range_key) if range_key == 'B': expect_message = 'expect %s or %s' % (unit_class, unit_class_name) if unit_class_name in unit.lower(): pass elif unit[1] != unit_class: raise ValueError("human_to_bytes() failed to convert %s. Value is not a valid string (%s)" % (number, expect_message)) return int(round(num * limit)) def bytes_to_human(size, isbits=False, unit=None): base = 'Bytes' if isbits: base = 'bits' suffix = '' for suffix, limit in sorted(iteritems(SIZE_RANGES), key=lambda item: -item[1]): if (unit is None and size >= limit) or unit is not None and unit.upper() == suffix[0]: break if limit != 1: suffix += base[0] else: suffix = base return '%.2f %s' % (size / limit, suffix)