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annotate roundup/anypy/random_.py @ 5729:9ea2ce9d10cf

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A few internet references report that etags for the same underlying resource but with different representation (xml, json ...) should have different etags. That is currently not the case. Added code to allow incorporation of representation info into the etag. By default the representation is "json", but future patches can pass the representation down and modify flow to match requested representation.
author John Rouillard <rouilj@ieee.org>
date Sat, 25 May 2019 14:23:16 -0400
parents 52cb53eedf77
children adf54478cdaf
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5488
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1 try:
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2 from secrets import choice, randbelow, token_bytes
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3 def seed(v = None):
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4 pass
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5
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6 is_weak = False
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7 except ImportError:
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8 import os as _os
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9 import random as _random
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10
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11 # prefer to use SystemRandom if it is available
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12 if hasattr(_random, 'SystemRandom'):
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13 def seed(v = None):
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14 pass
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15
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16 _r = _random.SystemRandom()
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17 is_weak = False
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18 else:
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19 # don't completely throw away the existing state, but add some
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20 # more random state to the existing state
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21 def seed(v = None):
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22 import os, time
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23 _r.seed((_r.getstate(),
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24 v,
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25 hasattr(os, 'getpid') and os.getpid(),
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26 time.time()))
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27
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28 # create our own instance so we don't mess with the global
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29 # random number generator
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30 _r = _random.Random()
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31 seed()
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32 is_weak = True
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33
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34 choice = _r.choice
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35
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36 def randbelow(i):
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37 return _r.randint(0, i - 1)
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38
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39 if hasattr(_os, 'urandom'):
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40 def token_bytes(l):
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41 return _os.urandom(l)
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42 else:
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43 def token_bytes(l):
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44 _bchr = chr if str == bytes else lambda x: bytes((x,))
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45 return b''.join([_bchr(_r.getrandbits(8)) for i in range(l)])
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