121 lines
4.9 KiB
Python
121 lines
4.9 KiB
Python
# Copyright 2013-2015 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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try:
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import unittest2 as unittest
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except ImportError:
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import unittest # noqa
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from cassandra import marshal
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from cassandra import util
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import calendar
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import datetime
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import time
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import uuid
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class TimeUtilTest(unittest.TestCase):
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def test_datetime_from_timestamp(self):
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self.assertEqual(util.datetime_from_timestamp(0), datetime.datetime(1970, 1, 1))
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# large negative; test PYTHON-110 workaround for windows
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self.assertEqual(util.datetime_from_timestamp(-62135596800), datetime.datetime(1, 1, 1))
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self.assertEqual(util.datetime_from_timestamp(-62135596199), datetime.datetime(1, 1, 1, 0, 10, 1))
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self.assertEqual(util.datetime_from_timestamp(253402300799), datetime.datetime(9999, 12, 31, 23, 59, 59))
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self.assertEqual(util.datetime_from_timestamp(0.123456), datetime.datetime(1970, 1, 1, 0, 0, 0, 123456))
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def test_times_from_uuid1(self):
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node = uuid.getnode()
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now = time.time()
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u = uuid.uuid1(node, 0)
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t = util.unix_time_from_uuid1(u)
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self.assertAlmostEqual(now, t, 2)
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dt = util.datetime_from_uuid1(u)
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t = calendar.timegm(dt.timetuple()) + dt.microsecond / 1e6
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self.assertAlmostEqual(now, t, 2)
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def test_uuid_from_time(self):
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t = time.time()
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seq = 0x2aa5
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node = uuid.getnode()
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u = util.uuid_from_time(t, node, seq)
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# using AlmostEqual because time precision is different for
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# some platforms
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self.assertAlmostEqual(util.unix_time_from_uuid1(u), t, 4)
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self.assertEqual(u.node, node)
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self.assertEqual(u.clock_seq, seq)
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# random node
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u1 = util.uuid_from_time(t, clock_seq=seq)
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u2 = util.uuid_from_time(t, clock_seq=seq)
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self.assertAlmostEqual(util.unix_time_from_uuid1(u1), t, 4)
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self.assertAlmostEqual(util.unix_time_from_uuid1(u2), t, 4)
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self.assertEqual(u.clock_seq, seq)
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# not impossible, but we shouldn't get the same value twice
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self.assertNotEqual(u1.node, u2.node)
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# random seq
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u1 = util.uuid_from_time(t, node=node)
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u2 = util.uuid_from_time(t, node=node)
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self.assertAlmostEqual(util.unix_time_from_uuid1(u1), t, 4)
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self.assertAlmostEqual(util.unix_time_from_uuid1(u2), t, 4)
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self.assertEqual(u.node, node)
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# not impossible, but we shouldn't get the same value twice
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self.assertNotEqual(u1.clock_seq, u2.clock_seq)
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# node too large
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with self.assertRaises(ValueError):
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u = util.uuid_from_time(t, node=2 ** 48)
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# clock_seq too large
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with self.assertRaises(ValueError):
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u = util.uuid_from_time(t, clock_seq=0x4000)
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# construct from datetime
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dt = util.datetime_from_timestamp(t)
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u = util.uuid_from_time(dt, node, seq)
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self.assertAlmostEqual(util.unix_time_from_uuid1(u), t, 4)
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self.assertEqual(u.node, node)
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self.assertEqual(u.clock_seq, seq)
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# 0 1 2 3
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# 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
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# +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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# | time_low |
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# +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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# | time_mid | time_hi_and_version |
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# +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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# |clk_seq_hi_res | clk_seq_low | node (0-1) |
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# +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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# | node (2-5) |
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# +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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def test_min_uuid(self):
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u = util.min_uuid_from_time(0)
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# cassandra does a signed comparison of the remaining bytes
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for i in range(8, 16):
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self.assertEqual(marshal.int8_unpack(u.bytes[i:i + 1]), -128)
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def test_max_uuid(self):
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u = util.max_uuid_from_time(0)
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# cassandra does a signed comparison of the remaining bytes
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# the first non-time byte has the variant in it
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# This byte is always negative, but should be the smallest negative
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# number with high-order bits '10'
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self.assertEqual(marshal.int8_unpack(u.bytes[8:9]), -65)
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for i in range(9, 16):
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self.assertEqual(marshal.int8_unpack(u.bytes[i:i + 1]), 127)
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