mirror of
https://github.com/PiBrewing/craftbeerpi4.git
synced 2024-12-28 08:21:45 +01:00
878 lines
21 KiB
Python
878 lines
21 KiB
Python
# coding: utf-8
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"""
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Miscellaneous data helpers, including functions for converting integers to and
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from bytes and UTC timezone. Exports the following items:
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- OrderedDict()
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- int_from_bytes()
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- int_to_bytes()
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- timezone.utc
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- utc_with_dst
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- create_timezone()
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- inet_ntop()
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- inet_pton()
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- uri_to_iri()
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- iri_to_uri()
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"""
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from __future__ import unicode_literals, division, absolute_import, print_function
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import math
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import sys
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from datetime import datetime, date, timedelta, tzinfo
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from ._errors import unwrap
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from ._iri import iri_to_uri, uri_to_iri # noqa
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from ._ordereddict import OrderedDict # noqa
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from ._types import type_name
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if sys.platform == 'win32':
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from ._inet import inet_ntop, inet_pton
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else:
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from socket import inet_ntop, inet_pton # noqa
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# Python 2
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if sys.version_info <= (3,):
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def int_to_bytes(value, signed=False, width=None):
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"""
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Converts an integer to a byte string
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:param value:
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The integer to convert
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:param signed:
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If the byte string should be encoded using two's complement
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:param width:
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If None, the minimal possible size (but at least 1),
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otherwise an integer of the byte width for the return value
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:return:
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A byte string
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"""
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if value == 0 and width == 0:
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return b''
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# Handle negatives in two's complement
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is_neg = False
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if signed and value < 0:
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is_neg = True
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bits = int(math.ceil(len('%x' % abs(value)) / 2.0) * 8)
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value = (value + (1 << bits)) % (1 << bits)
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hex_str = '%x' % value
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if len(hex_str) & 1:
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hex_str = '0' + hex_str
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output = hex_str.decode('hex')
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if signed and not is_neg and ord(output[0:1]) & 0x80:
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output = b'\x00' + output
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if width is not None:
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if len(output) > width:
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raise OverflowError('int too big to convert')
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if is_neg:
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pad_char = b'\xFF'
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else:
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pad_char = b'\x00'
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output = (pad_char * (width - len(output))) + output
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elif is_neg and ord(output[0:1]) & 0x80 == 0:
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output = b'\xFF' + output
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return output
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def int_from_bytes(value, signed=False):
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"""
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Converts a byte string to an integer
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:param value:
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The byte string to convert
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:param signed:
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If the byte string should be interpreted using two's complement
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:return:
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An integer
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"""
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if value == b'':
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return 0
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num = long(value.encode("hex"), 16) # noqa
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if not signed:
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return num
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# Check for sign bit and handle two's complement
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if ord(value[0:1]) & 0x80:
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bit_len = len(value) * 8
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return num - (1 << bit_len)
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return num
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class timezone(tzinfo): # noqa
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"""
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Implements datetime.timezone for py2.
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Only full minute offsets are supported.
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DST is not supported.
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"""
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def __init__(self, offset, name=None):
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"""
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:param offset:
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A timedelta with this timezone's offset from UTC
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:param name:
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Name of the timezone; if None, generate one.
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"""
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if not timedelta(hours=-24) < offset < timedelta(hours=24):
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raise ValueError('Offset must be in [-23:59, 23:59]')
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if offset.seconds % 60 or offset.microseconds:
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raise ValueError('Offset must be full minutes')
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self._offset = offset
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if name is not None:
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self._name = name
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elif not offset:
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self._name = 'UTC'
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else:
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self._name = 'UTC' + _format_offset(offset)
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def __eq__(self, other):
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"""
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Compare two timezones
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:param other:
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The other timezone to compare to
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:return:
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A boolean
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"""
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if type(other) != timezone:
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return False
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return self._offset == other._offset
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def __getinitargs__(self):
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"""
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Called by tzinfo.__reduce__ to support pickle and copy.
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:return:
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offset and name, to be used for __init__
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"""
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return self._offset, self._name
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def tzname(self, dt):
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"""
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:param dt:
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A datetime object; ignored.
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:return:
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Name of this timezone
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"""
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return self._name
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def utcoffset(self, dt):
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"""
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:param dt:
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A datetime object; ignored.
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:return:
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A timedelta object with the offset from UTC
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"""
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return self._offset
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def dst(self, dt):
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"""
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:param dt:
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A datetime object; ignored.
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:return:
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Zero timedelta
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"""
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return timedelta(0)
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timezone.utc = timezone(timedelta(0))
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# Python 3
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else:
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from datetime import timezone # noqa
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def int_to_bytes(value, signed=False, width=None):
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"""
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Converts an integer to a byte string
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:param value:
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The integer to convert
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:param signed:
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If the byte string should be encoded using two's complement
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:param width:
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If None, the minimal possible size (but at least 1),
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otherwise an integer of the byte width for the return value
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:return:
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A byte string
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"""
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if width is None:
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if signed:
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if value < 0:
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bits_required = abs(value + 1).bit_length()
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else:
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bits_required = value.bit_length()
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if bits_required % 8 == 0:
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bits_required += 1
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else:
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bits_required = value.bit_length()
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width = math.ceil(bits_required / 8) or 1
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return value.to_bytes(width, byteorder='big', signed=signed)
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def int_from_bytes(value, signed=False):
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"""
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Converts a byte string to an integer
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:param value:
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The byte string to convert
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:param signed:
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If the byte string should be interpreted using two's complement
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:return:
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An integer
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"""
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return int.from_bytes(value, 'big', signed=signed)
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def _format_offset(off):
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"""
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Format a timedelta into "[+-]HH:MM" format or "" for None
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"""
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if off is None:
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return ''
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mins = off.days * 24 * 60 + off.seconds // 60
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sign = '-' if mins < 0 else '+'
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return sign + '%02d:%02d' % divmod(abs(mins), 60)
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class _UtcWithDst(tzinfo):
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"""
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Utc class where dst does not return None; required for astimezone
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"""
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def tzname(self, dt):
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return 'UTC'
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def utcoffset(self, dt):
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return timedelta(0)
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def dst(self, dt):
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return timedelta(0)
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utc_with_dst = _UtcWithDst()
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_timezone_cache = {}
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def create_timezone(offset):
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"""
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Returns a new datetime.timezone object with the given offset.
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Uses cached objects if possible.
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:param offset:
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A datetime.timedelta object; It needs to be in full minutes and between -23:59 and +23:59.
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:return:
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A datetime.timezone object
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"""
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try:
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tz = _timezone_cache[offset]
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except KeyError:
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tz = _timezone_cache[offset] = timezone(offset)
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return tz
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class extended_date(object):
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"""
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A datetime.datetime-like object that represents the year 0. This is just
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to handle 0000-01-01 found in some certificates. Python's datetime does
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not support year 0.
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The proleptic gregorian calendar repeats itself every 400 years. Therefore,
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the simplest way to format is to substitute year 2000.
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"""
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def __init__(self, year, month, day):
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"""
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:param year:
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The integer 0
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:param month:
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An integer from 1 to 12
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:param day:
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An integer from 1 to 31
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"""
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if year != 0:
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raise ValueError('year must be 0')
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self._y2k = date(2000, month, day)
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@property
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def year(self):
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"""
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:return:
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The integer 0
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"""
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return 0
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@property
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def month(self):
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"""
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:return:
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An integer from 1 to 12
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"""
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return self._y2k.month
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@property
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def day(self):
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"""
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:return:
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An integer from 1 to 31
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"""
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return self._y2k.day
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def strftime(self, format):
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"""
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Formats the date using strftime()
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:param format:
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A strftime() format string
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:return:
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A str, the formatted date as a unicode string
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in Python 3 and a byte string in Python 2
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"""
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# Format the date twice, once with year 2000, once with year 4000.
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# The only differences in the result will be in the millennium. Find them and replace by zeros.
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y2k = self._y2k.strftime(format)
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y4k = self._y2k.replace(year=4000).strftime(format)
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return ''.join('0' if (c2, c4) == ('2', '4') else c2 for c2, c4 in zip(y2k, y4k))
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def isoformat(self):
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"""
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Formats the date as %Y-%m-%d
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:return:
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The date formatted to %Y-%m-%d as a unicode string in Python 3
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and a byte string in Python 2
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"""
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return self.strftime('0000-%m-%d')
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def replace(self, year=None, month=None, day=None):
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"""
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Returns a new datetime.date or asn1crypto.util.extended_date
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object with the specified components replaced
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:return:
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A datetime.date or asn1crypto.util.extended_date object
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"""
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if year is None:
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year = self.year
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if month is None:
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month = self.month
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if day is None:
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day = self.day
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if year > 0:
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cls = date
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else:
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cls = extended_date
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return cls(
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year,
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month,
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day
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)
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def __str__(self):
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"""
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:return:
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A str representing this extended_date, e.g. "0000-01-01"
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"""
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return self.strftime('%Y-%m-%d')
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def __eq__(self, other):
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"""
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Compare two extended_date objects
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:param other:
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The other extended_date to compare to
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:return:
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A boolean
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"""
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# datetime.date object wouldn't compare equal because it can't be year 0
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if not isinstance(other, self.__class__):
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return False
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return self.__cmp__(other) == 0
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def __ne__(self, other):
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"""
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Compare two extended_date objects
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:param other:
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The other extended_date to compare to
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:return:
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A boolean
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"""
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return not self.__eq__(other)
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def _comparison_error(self, other):
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raise TypeError(unwrap(
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'''
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An asn1crypto.util.extended_date object can only be compared to
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an asn1crypto.util.extended_date or datetime.date object, not %s
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''',
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type_name(other)
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))
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def __cmp__(self, other):
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"""
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Compare two extended_date or datetime.date objects
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:param other:
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The other extended_date object to compare to
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:return:
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An integer smaller than, equal to, or larger than 0
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"""
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# self is year 0, other is >= year 1
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if isinstance(other, date):
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return -1
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if not isinstance(other, self.__class__):
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self._comparison_error(other)
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if self._y2k < other._y2k:
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return -1
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if self._y2k > other._y2k:
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return 1
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return 0
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def __lt__(self, other):
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return self.__cmp__(other) < 0
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def __le__(self, other):
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return self.__cmp__(other) <= 0
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def __gt__(self, other):
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return self.__cmp__(other) > 0
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def __ge__(self, other):
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return self.__cmp__(other) >= 0
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class extended_datetime(object):
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"""
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A datetime.datetime-like object that represents the year 0. This is just
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to handle 0000-01-01 found in some certificates. Python's datetime does
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not support year 0.
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The proleptic gregorian calendar repeats itself every 400 years. Therefore,
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the simplest way to format is to substitute year 2000.
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"""
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# There are 97 leap days during 400 years.
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DAYS_IN_400_YEARS = 400 * 365 + 97
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DAYS_IN_2000_YEARS = 5 * DAYS_IN_400_YEARS
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def __init__(self, year, *args, **kwargs):
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"""
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:param year:
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The integer 0
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:param args:
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Other positional arguments; see datetime.datetime.
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:param kwargs:
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Other keyword arguments; see datetime.datetime.
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"""
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if year != 0:
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raise ValueError('year must be 0')
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self._y2k = datetime(2000, *args, **kwargs)
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@property
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def year(self):
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"""
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:return:
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The integer 0
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"""
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return 0
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@property
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def month(self):
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"""
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:return:
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An integer from 1 to 12
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"""
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return self._y2k.month
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@property
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def day(self):
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"""
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:return:
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An integer from 1 to 31
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"""
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return self._y2k.day
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@property
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def hour(self):
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"""
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:return:
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An integer from 1 to 24
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"""
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return self._y2k.hour
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@property
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def minute(self):
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"""
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:return:
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An integer from 1 to 60
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"""
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return self._y2k.minute
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@property
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def second(self):
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"""
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:return:
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An integer from 1 to 60
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"""
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return self._y2k.second
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@property
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def microsecond(self):
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"""
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:return:
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An integer from 0 to 999999
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"""
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return self._y2k.microsecond
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@property
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def tzinfo(self):
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"""
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:return:
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If object is timezone aware, a datetime.tzinfo object, else None.
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"""
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return self._y2k.tzinfo
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def utcoffset(self):
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"""
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:return:
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If object is timezone aware, a datetime.timedelta object, else None.
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"""
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return self._y2k.utcoffset()
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def time(self):
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"""
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:return:
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A datetime.time object
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"""
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return self._y2k.time()
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def date(self):
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"""
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:return:
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An asn1crypto.util.extended_date of the date
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"""
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return extended_date(0, self.month, self.day)
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def strftime(self, format):
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"""
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Performs strftime(), always returning a str
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:param format:
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A strftime() format string
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:return:
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A str of the formatted datetime
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"""
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# Format the datetime twice, once with year 2000, once with year 4000.
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# The only differences in the result will be in the millennium. Find them and replace by zeros.
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y2k = self._y2k.strftime(format)
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y4k = self._y2k.replace(year=4000).strftime(format)
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return ''.join('0' if (c2, c4) == ('2', '4') else c2 for c2, c4 in zip(y2k, y4k))
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|
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def isoformat(self, sep='T'):
|
|
"""
|
|
Formats the date as "%Y-%m-%d %H:%M:%S" with the sep param between the
|
|
date and time portions
|
|
|
|
:param set:
|
|
A single character of the separator to place between the date and
|
|
time
|
|
|
|
:return:
|
|
The formatted datetime as a unicode string in Python 3 and a byte
|
|
string in Python 2
|
|
"""
|
|
|
|
s = '0000-%02d-%02d%c%02d:%02d:%02d' % (self.month, self.day, sep, self.hour, self.minute, self.second)
|
|
if self.microsecond:
|
|
s += '.%06d' % self.microsecond
|
|
return s + _format_offset(self.utcoffset())
|
|
|
|
def replace(self, year=None, *args, **kwargs):
|
|
"""
|
|
Returns a new datetime.datetime or asn1crypto.util.extended_datetime
|
|
object with the specified components replaced
|
|
|
|
:param year:
|
|
The new year to substitute. None to keep it.
|
|
|
|
:param args:
|
|
Other positional arguments; see datetime.datetime.replace.
|
|
|
|
:param kwargs:
|
|
Other keyword arguments; see datetime.datetime.replace.
|
|
|
|
:return:
|
|
A datetime.datetime or asn1crypto.util.extended_datetime object
|
|
"""
|
|
|
|
if year:
|
|
return self._y2k.replace(year, *args, **kwargs)
|
|
|
|
return extended_datetime.from_y2k(self._y2k.replace(2000, *args, **kwargs))
|
|
|
|
def astimezone(self, tz):
|
|
"""
|
|
Convert this extended_datetime to another timezone.
|
|
|
|
:param tz:
|
|
A datetime.tzinfo object.
|
|
|
|
:return:
|
|
A new extended_datetime or datetime.datetime object
|
|
"""
|
|
|
|
return extended_datetime.from_y2k(self._y2k.astimezone(tz))
|
|
|
|
def timestamp(self):
|
|
"""
|
|
Return POSIX timestamp. Only supported in python >= 3.3
|
|
|
|
:return:
|
|
A float representing the seconds since 1970-01-01 UTC. This will be a negative value.
|
|
"""
|
|
|
|
return self._y2k.timestamp() - self.DAYS_IN_2000_YEARS * 86400
|
|
|
|
def __str__(self):
|
|
"""
|
|
:return:
|
|
A str representing this extended_datetime, e.g. "0000-01-01 00:00:00.000001-10:00"
|
|
"""
|
|
|
|
return self.isoformat(sep=' ')
|
|
|
|
def __eq__(self, other):
|
|
"""
|
|
Compare two extended_datetime objects
|
|
|
|
:param other:
|
|
The other extended_datetime to compare to
|
|
|
|
:return:
|
|
A boolean
|
|
"""
|
|
|
|
# Only compare against other datetime or extended_datetime objects
|
|
if not isinstance(other, (self.__class__, datetime)):
|
|
return False
|
|
|
|
# Offset-naive and offset-aware datetimes are never the same
|
|
if (self.tzinfo is None) != (other.tzinfo is None):
|
|
return False
|
|
|
|
return self.__cmp__(other) == 0
|
|
|
|
def __ne__(self, other):
|
|
"""
|
|
Compare two extended_datetime objects
|
|
|
|
:param other:
|
|
The other extended_datetime to compare to
|
|
|
|
:return:
|
|
A boolean
|
|
"""
|
|
|
|
return not self.__eq__(other)
|
|
|
|
def _comparison_error(self, other):
|
|
"""
|
|
Raises a TypeError about the other object not being suitable for
|
|
comparison
|
|
|
|
:param other:
|
|
The object being compared to
|
|
"""
|
|
|
|
raise TypeError(unwrap(
|
|
'''
|
|
An asn1crypto.util.extended_datetime object can only be compared to
|
|
an asn1crypto.util.extended_datetime or datetime.datetime object,
|
|
not %s
|
|
''',
|
|
type_name(other)
|
|
))
|
|
|
|
def __cmp__(self, other):
|
|
"""
|
|
Compare two extended_datetime or datetime.datetime objects
|
|
|
|
:param other:
|
|
The other extended_datetime or datetime.datetime object to compare to
|
|
|
|
:return:
|
|
An integer smaller than, equal to, or larger than 0
|
|
"""
|
|
|
|
if not isinstance(other, (self.__class__, datetime)):
|
|
self._comparison_error(other)
|
|
|
|
if (self.tzinfo is None) != (other.tzinfo is None):
|
|
raise TypeError("can't compare offset-naive and offset-aware datetimes")
|
|
|
|
diff = self - other
|
|
zero = timedelta(0)
|
|
if diff < zero:
|
|
return -1
|
|
if diff > zero:
|
|
return 1
|
|
return 0
|
|
|
|
def __lt__(self, other):
|
|
return self.__cmp__(other) < 0
|
|
|
|
def __le__(self, other):
|
|
return self.__cmp__(other) <= 0
|
|
|
|
def __gt__(self, other):
|
|
return self.__cmp__(other) > 0
|
|
|
|
def __ge__(self, other):
|
|
return self.__cmp__(other) >= 0
|
|
|
|
def __add__(self, other):
|
|
"""
|
|
Adds a timedelta
|
|
|
|
:param other:
|
|
A datetime.timedelta object to add.
|
|
|
|
:return:
|
|
A new extended_datetime or datetime.datetime object.
|
|
"""
|
|
|
|
return extended_datetime.from_y2k(self._y2k + other)
|
|
|
|
def __sub__(self, other):
|
|
"""
|
|
Subtracts a timedelta or another datetime.
|
|
|
|
:param other:
|
|
A datetime.timedelta or datetime.datetime or extended_datetime object to subtract.
|
|
|
|
:return:
|
|
If a timedelta is passed, a new extended_datetime or datetime.datetime object.
|
|
Else a datetime.timedelta object.
|
|
"""
|
|
|
|
if isinstance(other, timedelta):
|
|
return extended_datetime.from_y2k(self._y2k - other)
|
|
|
|
if isinstance(other, extended_datetime):
|
|
return self._y2k - other._y2k
|
|
|
|
if isinstance(other, datetime):
|
|
return self._y2k - other - timedelta(days=self.DAYS_IN_2000_YEARS)
|
|
|
|
return NotImplemented
|
|
|
|
def __rsub__(self, other):
|
|
return -(self - other)
|
|
|
|
@classmethod
|
|
def from_y2k(cls, value):
|
|
"""
|
|
Revert substitution of year 2000.
|
|
|
|
:param value:
|
|
A datetime.datetime object which is 2000 years in the future.
|
|
:return:
|
|
A new extended_datetime or datetime.datetime object.
|
|
"""
|
|
|
|
year = value.year - 2000
|
|
|
|
if year > 0:
|
|
new_cls = datetime
|
|
else:
|
|
new_cls = cls
|
|
|
|
return new_cls(
|
|
year,
|
|
value.month,
|
|
value.day,
|
|
value.hour,
|
|
value.minute,
|
|
value.second,
|
|
value.microsecond,
|
|
value.tzinfo
|
|
)
|