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annotate roundup/rate_limit.py @ 8264:09e8d1a4c796

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docs: clarify wording, fix index, add superseder link Make superseder, messages etc. properties index entries point to the right place. Link to description of using Superseder in the original overview. fix bad wording on boolean properties.
author John Rouillard <rouilj@ieee.org>
date Wed, 08 Jan 2025 11:39:54 -0500
parents 5fbd3af526bd
children 224ccb8b49ca
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1 # Originaly from
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2 # https://smarketshq.com/implementing-gcra-in-python-5df1f11aaa96?gi=4b9725f99bfa
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3 # with imports, modifications for python 2, implementation of
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4 # set/get_tat and marshaling as string, support for testonly
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5 # and status method.
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6
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7 from datetime import timedelta, datetime
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8
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9 try:
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10 # used by python 3.11 and newer use tz aware dates
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11 from datetime import UTC
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12 dt_min = datetime.min.replace(tzinfo=UTC)
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13 # start of unix epoch
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14 dt_epoch = datetime(1970, 1, 1, tzinfo=UTC)
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15 fromisoformat = datetime.fromisoformat
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16 except ImportError:
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17 # python 2.7 and older than 3.11 - use naive dates
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18 dt_min = datetime.min
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19 dt_epoch = datetime(1970, 1, 1)
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20 def fromisoformat(date):
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21 # only for naive dates
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22 return datetime.strptime(date, "%Y-%m-%dT%H:%M:%S.%f")
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23
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24 from roundup.anypy.datetime_ import utcnow
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25
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26
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27 class RateLimit: # pylint: disable=too-few-public-methods
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28 def __init__(self, count, period):
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29 self.count = count
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30 self.period = period
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31
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32 @property
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33 def inverse(self):
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34 return self.period.total_seconds() / self.count
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35
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36
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37 class Gcra:
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38 def __init__(self):
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39 self.memory = {}
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40
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41 def get_tat(self, key):
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42 # This should return a previous tat for the key or the current time.
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43 if key in self.memory:
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44 return self.memory[key]
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45 else:
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46 return dt_min
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47
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48 def set_tat(self, key, tat):
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49 self.memory[key] = tat
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50
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51 def get_tat_as_string(self, key):
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52 # get value as string:
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53 # YYYY-MM-DDTHH:MM:SS.mmmmmm
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54 # to allow it to be marshalled/unmarshaled
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55 if key in self.memory:
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56 return self.memory[key].isoformat()
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57 else:
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58 return dt_min.isoformat()
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59
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60 def set_tat_as_string(self, key, tat):
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61 # Take value as string and unmarshall:
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62 # YYYY-MM-DDTHH:MM:SS.mmmmmm
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63 # to datetime
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64 self.memory[key] = fromisoformat(tat)
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65
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66 def update(self, key, limit, testonly=False):
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67 '''Determine if the item associated with the key should be
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68 rejected given the RateLimit limit.
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69 '''
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70 now = utcnow()
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71 tat = max(self.get_tat(key), now)
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72 separation = (tat - now).total_seconds()
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73 max_interval = limit.period.total_seconds() - limit.inverse
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74 if separation > max_interval:
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75 reject = True
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76 else:
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77 reject = False
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78 if not testonly:
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79 new_tat = max(tat, now) + timedelta(seconds=limit.inverse)
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80 self.set_tat(key, new_tat)
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81 return reject
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82
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83 def status(self, key, limit):
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84 '''Return status suitable for displaying as headers:
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85 X-RateLimit-Limit: calls allowed per period. Period/window
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86 is not specified in any api I found.
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87 X-RateLimit-Limit-Period: Non standard. Defines period in
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88 seconds for RateLimit-Limit.
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89 X-RateLimit-Remaining: How many calls are left in this window.
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90 X-RateLimit-Reset: window ends in this many seconds (not an
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91 epoch timestamp) and all RateLimit-Limit calls are
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92 available again.
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93 Retry-After: if user's request fails, this is the next time there
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94 will be at least 1 available call to be consumed.
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95 '''
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96
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97 ret = {}
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98 tat = self.get_tat(key)
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99 # static defined headers according to limit
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100 # all values are strings as that is required when used as headers
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101 ret['X-RateLimit-Limit'] = str(limit.count)
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102 ret['X-RateLimit-Limit-Period'] = str(
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103 int(
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104 limit.period.total_seconds())
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105 )
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106
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107 # status of current limit as of now
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108 now = utcnow()
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109
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110 current_count = int((limit.period - (tat - now)).total_seconds() /
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111 limit.inverse)
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112 ret['X-RateLimit-Remaining'] = str(min(current_count, limit.count))
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113
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114 # tat_in_epochsec = (tat - datetime(1970, 1, 1)).total_seconds()
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115 seconds_to_tat = (tat - now).total_seconds()
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116 ret['X-RateLimit-Reset'] = str(max(seconds_to_tat, 0))
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117 ret['X-RateLimit-Reset-date'] = "%s" % tat
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118 ret['Now'] = str((now - dt_epoch).total_seconds())
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119 ret['Now-date'] = "%s" % now
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120
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121 if self.update(key, limit, testonly=True):
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122 # A new request would be rejected if it was processes.
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123 # The user has to wait until an item is dequeued.
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124 # One item is dequeued every limit.inverse seconds.
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125 ret['Retry-After'] = str(int(limit.inverse))
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126 ret['Retry-After-Timestamp'] = "%s" % \
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127 (now + timedelta(seconds=limit.inverse)) # noqa: E127
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128 else:
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129 # if we are not rejected, the user can post another
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130 # attempt immediately.
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131 # Do we even need this header if not rejected?
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132 # RFC implies this is used with a 503 (or presumably
cad18de2b988 issue2550949: Rate limit password guesses/login attempts.
John Rouillard <rouilj@ieee.org>
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133 # 429 which may postdate the rfc). So if no error, no header?
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5d0873a4de4a fix rate limit headers - were ints/floats need to be strings
John Rouillard <rouilj@ieee.org>
parents: 5739
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134 # ret['Retry-After'] = '0'
5d0873a4de4a fix rate limit headers - were ints/floats need to be strings
John Rouillard <rouilj@ieee.org>
parents: 5739
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135 # ret['Retry-After-Timestamp'] = str(ret['Now-date'])
5717
cad18de2b988 issue2550949: Rate limit password guesses/login attempts.
John Rouillard <rouilj@ieee.org>
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136 pass
cad18de2b988 issue2550949: Rate limit password guesses/login attempts.
John Rouillard <rouilj@ieee.org>
parents:
diff changeset
137
cad18de2b988 issue2550949: Rate limit password guesses/login attempts.
John Rouillard <rouilj@ieee.org>
parents:
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138 return ret
Roundup Issue Tracker: http://roundup-tracker.org/