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annotate roundup/anypy/random_.py @ 8408:e882a5d52ae5

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refactor: move RateLimitExceeded to roundup.cgi.exceptions RateLimitExceeded is an HTTP exception that raises code 429. Move it to roundup.cgi.exceptions where all the other exceptions that result in http status codes are located. Also make it inherit from HTTPException since it is one. Also add docstrings for all HTTP exceptions and order HTTPExceptions by status code. BREAKING CHANGE: if somebody is importing RateLimitExceeded they will need to change their import. I consider it unlikely anybody is using RateLimitExceeded. Detectors and extensions are unlikely to raise RateLimitExceeded. So I am leaving it out of the upgrading doc. Just doc in change log.
author John Rouillard <rouilj@ieee.org>
date Sun, 10 Aug 2025 21:27:06 -0400
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1 # ruff: noqa: ARG001
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2 try:
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3 from secrets import choice, randbelow, token_bytes
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4
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5 def seed(v=None):
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6 pass
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7
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8 is_weak = False
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9 except ImportError:
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10 import os as _os
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11 import random as _random
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12
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13 # prefer to use SystemRandom if it is available
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14 if hasattr(_random, 'SystemRandom'):
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15 def seed(v=None):
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16 pass
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17
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18 _r = _random.SystemRandom()
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19 is_weak = False
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20 else:
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21 # don't completely throw away the existing state, but add some
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22 # more random state to the existing state
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23 def seed(v=None):
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24 # ruff: noqa: PLC0415
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25 import os
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26 import time
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27 _r.seed((_r.getstate(),
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28 v,
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29 hasattr(os, 'getpid') and os.getpid(),
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30 time.time()))
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31
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32 # create our own instance so we don't mess with the global
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33 # random number generator
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34 _r = _random.Random()
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35 seed()
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36 is_weak = True
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37
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38 choice = _r.choice
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39
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40 def randbelow(i):
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41 return _r.randint(0, i - 1)
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42
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43 if hasattr(_os, 'urandom'):
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44 def token_bytes(size):
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45 return _os.urandom(size)
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46 else:
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47 def token_bytes(size):
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48 _bchr = chr if str is bytes else lambda x: bytes((x,))
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49 return b''.join([_bchr(_r.getrandbits(8)) for i in range(size)])
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