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annotate roundup/anypy/random_.py @ 6806:bdd28b244839

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- issue2551223 - fix timestamp truncation in mysql and postgresql The data types used to represent timestamps in pg and mysql for ephemeral tables: sessions and otks don't have enough signifcant digits to work. As a result the timestamps are rounduped (up/down) rsuling in the stored timestamp being 2 minutes (pg) or 2-3 hours(mysql) off from what it should be. Modify db schema to use a numeric type that preserves more significant figures. Implement schema upgrade. Document need for upgrade in upgrading.txt. Write tests for schema upgrade. Implement test for updateTimestamp method on BasicDatabase that showed this issue in the first place. Write overrides for test for anydbm/memorydb which store timestamp properly or not at all.
author John Rouillard <rouilj@ieee.org>
date Mon, 25 Jul 2022 17:20:20 -0400
parents adf54478cdaf
children 07ce4e4110f5
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1 try:
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2 from secrets import choice, randbelow, token_bytes
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3
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4 def seed(v=None):
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5 pass
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6
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7 is_weak = False
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8 except ImportError:
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9 import os as _os
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10 import random as _random
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11
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12 # prefer to use SystemRandom if it is available
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13 if hasattr(_random, 'SystemRandom'):
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14 def seed(v=None):
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15 pass
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17 _r = _random.SystemRandom()
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18 is_weak = False
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19 else:
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20 # don't completely throw away the existing state, but add some
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21 # more random state to the existing state
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22 def seed(v=None):
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23 import os, time
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24 _r.seed((_r.getstate(),
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25 v,
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26 hasattr(os, 'getpid') and os.getpid(),
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27 time.time()))
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28
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29 # create our own instance so we don't mess with the global
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30 # random number generator
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31 _r = _random.Random()
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32 seed()
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33 is_weak = True
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34
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35 choice = _r.choice
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36
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37 def randbelow(i):
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38 return _r.randint(0, i - 1)
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39
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40 if hasattr(_os, 'urandom'):
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41 def token_bytes(l):
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42 return _os.urandom(l)
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43 else:
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44 def token_bytes(l):
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45 _bchr = chr if str == bytes else lambda x: bytes((x,))
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46 return b''.join([_bchr(_r.getrandbits(8)) for i in range(l)])
Roundup Issue Tracker: http://roundup-tracker.org/