72 lines
2.4 KiB
Python
72 lines
2.4 KiB
Python
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# Adapted from the Cassandra Python driver.
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#
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# Copyright DataStax, Inc.
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#
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# Licensed under the Apache License, Version 2.0 (the "License");
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# you may not use this file except in compliance with the License.
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# You may obtain a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.
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import calendar
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import random
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import uuid
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def uuid_from_time(time_arg, node=None, clock_seq=None):
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"""
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Converts a datetime or timestamp to a type 1 :class:`uuid.UUID`.
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:param time_arg:
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The time to use for the timestamp portion of the UUID.
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This can either be a :class:`datetime` object or a timestamp
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in seconds (as returned from :meth:`time.time()`).
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:type datetime: :class:`datetime` or timestamp
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:param node:
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None integer for the UUID (up to 48 bits). If not specified, this
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field is randomized.
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:type node: long
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:param clock_seq:
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Clock sequence field for the UUID (up to 14 bits). If not specified,
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a random sequence is generated.
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:type clock_seq: int
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:rtype: :class:`uuid.UUID`
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"""
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if hasattr(time_arg, 'utctimetuple'):
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seconds = int(calendar.timegm(time_arg.utctimetuple()))
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microseconds = (seconds * 1e6) + time_arg.time().microsecond
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else:
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microseconds = int(time_arg * 1e6)
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# 0x01b21dd213814000 is the number of 100-ns intervals between the
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# UUID epoch 1582-10-15 00:00:00 and the Unix epoch 1970-01-01 00:00:00.
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intervals = int(microseconds * 10) + 0x01b21dd213814000
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time_low = intervals & 0xffffffff
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time_mid = (intervals >> 32) & 0xffff
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time_hi_version = (intervals >> 48) & 0x0fff
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if clock_seq is None:
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clock_seq = random.getrandbits(14)
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else:
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if clock_seq > 0x3fff:
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raise ValueError('clock_seq is out of range (need a 14-bit value)')
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clock_seq_low = clock_seq & 0xff
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clock_seq_hi_variant = 0x80 | ((clock_seq >> 8) & 0x3f)
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if node is None:
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node = random.getrandbits(48)
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return uuid.UUID(fields=(time_low, time_mid, time_hi_version,
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clock_seq_hi_variant, clock_seq_low, node), version=1)
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