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annotate roundup/anypy/random_.py @ 7696:4af0d235b570

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feat(db): support using postgresql service connection file Add new service rdbms config option to set the service name to be used with a postgresql service connection file. This can be done using the PGSERVICE environment variable for a single instance tracker server. For a multi-instance server this per-tracker config option is needed. Note that settings (host, user, (db)name...) in config.ini file will override the service connection file setting. Also setting PGSERVICE and service will use the service setting.
author John Rouillard <rouilj@ieee.org>
date Tue, 07 Nov 2023 12:11:37 -0500
parents 07ce4e4110f5
children f002747b6773
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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
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24 import time
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25 _r.seed((_r.getstate(),
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26 v,
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27 hasattr(os, 'getpid') and os.getpid(),
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28 time.time()))
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29
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30 # create our own instance so we don't mess with the global
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31 # random number generator
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32 _r = _random.Random()
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33 seed()
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34 is_weak = True
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35
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36 choice = _r.choice
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37
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38 def randbelow(i):
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39 return _r.randint(0, i - 1)
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40
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41 if hasattr(_os, 'urandom'):
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42 def token_bytes(l):
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43 return _os.urandom(l)
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44 else:
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45 def token_bytes(l):
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46 _bchr = chr if str == bytes else lambda x: bytes((x,))
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47 return b''.join([_bchr(_r.getrandbits(8)) for i in range(l)])
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