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# Copyright 2023 VyOS maintainers and contributors <maintainers@vyos.io>
#
# This library is free software; you can redistribute it and/or
# modify it under the terms of the GNU Lesser General Public
# License as published by the Free Software Foundation; either
# version 2.1 of the License, or (at your option) any later version.
#
# This library is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
# Lesser General Public License for more details.
#
# You should have received a copy of the GNU Lesser General Public
# License along with this library. If not, see <http://www.gnu.org/licenses/>.
def seconds_to_human(s, separator=""):
""" Converts number of seconds passed to a human-readable
interval such as 1w4d18h35m59s
"""
s = int(s)
week = 60 * 60 * 24 * 7
day = 60 * 60 * 24
hour = 60 * 60
remainder = 0
result = ""
weeks = s // week
if weeks > 0:
result = "{0}w".format(weeks)
s = s % week
days = s // day
if days > 0:
result = "{0}{1}{2}d".format(result, separator, days)
s = s % day
hours = s // hour
if hours > 0:
result = "{0}{1}{2}h".format(result, separator, hours)
s = s % hour
minutes = s // 60
if minutes > 0:
result = "{0}{1}{2}m".format(result, separator, minutes)
s = s % 60
seconds = s
if seconds > 0:
result = "{0}{1}{2}s".format(result, separator, seconds)
return result
def bytes_to_human(bytes, initial_exponent=0, precision=2):
""" Converts a value in bytes to a human-readable size string like 640 KB
The initial_exponent parameter is the exponent of 2,
e.g. 10 (1024) for kilobytes, 20 (1024 * 1024) for megabytes.
"""
if bytes == 0:
return "0 B"
from math import log2
bytes = bytes * (2**initial_exponent)
# log2 is a float, while range checking requires an int
exponent = int(log2(bytes))
if exponent < 10:
value = bytes
suffix = "B"
elif exponent in range(10, 20):
value = bytes / 1024
suffix = "KB"
elif exponent in range(20, 30):
value = bytes / 1024**2
suffix = "MB"
elif exponent in range(30, 40):
value = bytes / 1024**3
suffix = "GB"
else:
value = bytes / 1024**4
suffix = "TB"
# Add a new case when the first machine with petabyte RAM
# hits the market.
size_string = "{0:.{1}f} {2}".format(value, precision, suffix)
return size_string
def human_to_bytes(value):
""" Converts a data amount with a unit suffix to bytes, like 2K to 2048 """
from re import match as re_match
res = re_match(r'^\s*(\d+(?:\.\d+)?)\s*([a-zA-Z]+)\s*$', value)
if not res:
raise ValueError(f"'{value}' is not a valid data amount")
else:
amount = float(res.group(1))
unit = res.group(2).lower()
if unit == 'b':
res = amount
elif (unit == 'k') or (unit == 'kb'):
res = amount * 1024
elif (unit == 'm') or (unit == 'mb'):
res = amount * 1024**2
elif (unit == 'g') or (unit == 'gb'):
res = amount * 1024**3
elif (unit == 't') or (unit == 'tb'):
res = amount * 1024**4
else:
raise ValueError(f"Unsupported data unit '{unit}'")
# There cannot be fractional bytes, so we convert them to integer.
# However, truncating causes problems with conversion back to human unit,
# so we round instead -- that seems to work well enough.
return round(res)
def mac_to_eui64(mac, prefix=None):
"""
Convert a MAC address to a EUI64 address or, with prefix provided, a full
IPv6 address.
Thankfully copied from https://gist.github.com/wido/f5e32576bb57b5cc6f934e177a37a0d3
"""
import re
from ipaddress import ip_network
# http://tools.ietf.org/html/rfc4291#section-2.5.1
eui64 = re.sub(r'[.:-]', '', mac).lower()
eui64 = eui64[0:6] + 'fffe' + eui64[6:]
eui64 = hex(int(eui64[0:2], 16) ^ 2)[2:].zfill(2) + eui64[2:]
if prefix is None:
return ':'.join(re.findall(r'.{4}', eui64))
else:
try:
net = ip_network(prefix, strict=False)
euil = int('0x{0}'.format(eui64), 16)
return str(net[euil])
except: # pylint: disable=bare-except
return
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