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 python-310

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test_time_util.py

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# Copyright 2013-2016 DataStax, Inc.

#

# Licensed under the Apache License, Version 2.0 (the "License");

# you may not use this file except in compliance with the License.

# You may obtain a copy of the License at

#

# http://www.apache.org/licenses/LICENSE-2.0

#

# Unless required by applicable law or agreed to in writing, software

# distributed under the License is distributed on an "AS IS" BASIS,

# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.

# See the License for the specific language governing permissions and

# limitations under the License.

try:

import unittest2 as unittest

except ImportError:

import unittest # noqa

from cassandra import marshal

from cassandra import util

import calendar

import datetime

import time

import uuid

class TimeUtilTest(unittest.TestCase):

def test_datetime_from_timestamp(self):

self.assertEqual(util.datetime_from_timestamp(0), datetime.datetime(1970, 1, 1))

# large negative; test PYTHON-110 workaround for windows

self.assertEqual(util.datetime_from_timestamp(-62135596800), datetime.datetime(1, 1, 1))

self.assertEqual(util.datetime_from_timestamp(-62135596199), datetime.datetime(1, 1, 1, 0, 10, 1))

self.assertEqual(util.datetime_from_timestamp(253402300799), datetime.datetime(9999, 12, 31, 23, 59, 59))

self.assertEqual(util.datetime_from_timestamp(0.123456), datetime.datetime(1970, 1, 1, 0, 0, 0, 123456))

def test_times_from_uuid1(self):

node = uuid.getnode()

now = time.time()

u = uuid.uuid1(node, 0)

t = util.unix_time_from_uuid1(u)

self.assertAlmostEqual(now, t, 2)

dt = util.datetime_from_uuid1(u)

t = calendar.timegm(dt.timetuple()) + dt.microsecond / 1e6

self.assertAlmostEqual(now, t, 2)

def test_uuid_from_time(self):

t = time.time()

seq = 0x2aa5

node = uuid.getnode()

u = util.uuid_from_time(t, node, seq)

# using AlmostEqual because time precision is different for

# some platforms

self.assertAlmostEqual(util.unix_time_from_uuid1(u), t, 4)

self.assertEqual(u.node, node)

self.assertEqual(u.clock_seq, seq)

# random node

u1 = util.uuid_from_time(t, clock_seq=seq)

u2 = util.uuid_from_time(t, clock_seq=seq)

self.assertAlmostEqual(util.unix_time_from_uuid1(u1), t, 4)

self.assertAlmostEqual(util.unix_time_from_uuid1(u2), t, 4)

self.assertEqual(u.clock_seq, seq)

# not impossible, but we shouldn't get the same value twice

self.assertNotEqual(u1.node, u2.node)

# random seq

u1 = util.uuid_from_time(t, node=node)

u2 = util.uuid_from_time(t, node=node)

self.assertAlmostEqual(util.unix_time_from_uuid1(u1), t, 4)

self.assertAlmostEqual(util.unix_time_from_uuid1(u2), t, 4)

self.assertEqual(u.node, node)

# not impossible, but we shouldn't get the same value twice

self.assertNotEqual(u1.clock_seq, u2.clock_seq)

# node too large

with self.assertRaises(ValueError):

u = util.uuid_from_time(t, node=2 ** 48)

# clock_seq too large

with self.assertRaises(ValueError):

u = util.uuid_from_time(t, clock_seq=0x4000)

# construct from datetime

dt = util.datetime_from_timestamp(t)

u = util.uuid_from_time(dt, node, seq)

self.assertAlmostEqual(util.unix_time_from_uuid1(u), t, 4)

self.assertEqual(u.node, node)

self.assertEqual(u.clock_seq, seq)

# 0 1 2 3

# 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

# +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+

# | time_low |

# +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+

# | time_mid | time_hi_and_version |

# +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+

# |clk_seq_hi_res | clk_seq_low | node (0-1) |

# +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+

# | node (2-5) |

# +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+

def test_min_uuid(self):

u = util.min_uuid_from_time(0)

# cassandra does a signed comparison of the remaining bytes

for i in range(8, 16):

self.assertEqual(marshal.int8_unpack(u.bytes[i:i + 1]), -128)

def test_max_uuid(self):

u = util.max_uuid_from_time(0)

# cassandra does a signed comparison of the remaining bytes

# the first non-time byte has the variant in it

# This byte is always negative, but should be the smallest negative

# number with high-order bits '10'

self.assertEqual(marshal.int8_unpack(u.bytes[8:9]), -65)

for i in range(9, 16):

self.assertEqual(marshal.int8_unpack(u.bytes[i:i + 1]), 127)