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annotate planemo/lib/python3.7/site-packages/pip/_vendor/retrying.py @ 1:56ad4e20f292 draft

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"planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
author guerler
date Fri, 31 Jul 2020 00:32:28 -0400
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1 ## Copyright 2013-2014 Ray Holder
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2 ##
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3 ## Licensed under the Apache License, Version 2.0 (the "License");
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4 ## you may not use this file except in compliance with the License.
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5 ## You may obtain a copy of the License at
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6 ##
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7 ## http://www.apache.org/licenses/LICENSE-2.0
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8 ##
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9 ## Unless required by applicable law or agreed to in writing, software
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10 ## distributed under the License is distributed on an "AS IS" BASIS,
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11 ## WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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12 ## See the License for the specific language governing permissions and
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13 ## limitations under the License.
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14
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15 import random
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16 from pip._vendor import six
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17 import sys
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18 import time
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19 import traceback
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20
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21
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22 # sys.maxint / 2, since Python 3.2 doesn't have a sys.maxint...
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23 MAX_WAIT = 1073741823
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24
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25
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26 def retry(*dargs, **dkw):
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27 """
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28 Decorator function that instantiates the Retrying object
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29 @param *dargs: positional arguments passed to Retrying object
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30 @param **dkw: keyword arguments passed to the Retrying object
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31 """
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32 # support both @retry and @retry() as valid syntax
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33 if len(dargs) == 1 and callable(dargs[0]):
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34 def wrap_simple(f):
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35
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36 @six.wraps(f)
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37 def wrapped_f(*args, **kw):
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38 return Retrying().call(f, *args, **kw)
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39
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40 return wrapped_f
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41
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42 return wrap_simple(dargs[0])
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43
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44 else:
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45 def wrap(f):
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46
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47 @six.wraps(f)
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48 def wrapped_f(*args, **kw):
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49 return Retrying(*dargs, **dkw).call(f, *args, **kw)
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50
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51 return wrapped_f
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52
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53 return wrap
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54
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55
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56 class Retrying(object):
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57
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58 def __init__(self,
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59 stop=None, wait=None,
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60 stop_max_attempt_number=None,
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61 stop_max_delay=None,
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62 wait_fixed=None,
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63 wait_random_min=None, wait_random_max=None,
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64 wait_incrementing_start=None, wait_incrementing_increment=None,
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65 wait_exponential_multiplier=None, wait_exponential_max=None,
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66 retry_on_exception=None,
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67 retry_on_result=None,
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68 wrap_exception=False,
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69 stop_func=None,
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70 wait_func=None,
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71 wait_jitter_max=None):
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72
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73 self._stop_max_attempt_number = 5 if stop_max_attempt_number is None else stop_max_attempt_number
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74 self._stop_max_delay = 100 if stop_max_delay is None else stop_max_delay
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75 self._wait_fixed = 1000 if wait_fixed is None else wait_fixed
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76 self._wait_random_min = 0 if wait_random_min is None else wait_random_min
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77 self._wait_random_max = 1000 if wait_random_max is None else wait_random_max
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78 self._wait_incrementing_start = 0 if wait_incrementing_start is None else wait_incrementing_start
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79 self._wait_incrementing_increment = 100 if wait_incrementing_increment is None else wait_incrementing_increment
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80 self._wait_exponential_multiplier = 1 if wait_exponential_multiplier is None else wait_exponential_multiplier
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81 self._wait_exponential_max = MAX_WAIT if wait_exponential_max is None else wait_exponential_max
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82 self._wait_jitter_max = 0 if wait_jitter_max is None else wait_jitter_max
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83
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84 # TODO add chaining of stop behaviors
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85 # stop behavior
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86 stop_funcs = []
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87 if stop_max_attempt_number is not None:
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88 stop_funcs.append(self.stop_after_attempt)
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89
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90 if stop_max_delay is not None:
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91 stop_funcs.append(self.stop_after_delay)
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92
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93 if stop_func is not None:
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94 self.stop = stop_func
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95
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96 elif stop is None:
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97 self.stop = lambda attempts, delay: any(f(attempts, delay) for f in stop_funcs)
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98
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99 else:
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100 self.stop = getattr(self, stop)
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101
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102 # TODO add chaining of wait behaviors
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103 # wait behavior
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104 wait_funcs = [lambda *args, **kwargs: 0]
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105 if wait_fixed is not None:
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106 wait_funcs.append(self.fixed_sleep)
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107
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108 if wait_random_min is not None or wait_random_max is not None:
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109 wait_funcs.append(self.random_sleep)
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110
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111 if wait_incrementing_start is not None or wait_incrementing_increment is not None:
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112 wait_funcs.append(self.incrementing_sleep)
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113
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114 if wait_exponential_multiplier is not None or wait_exponential_max is not None:
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115 wait_funcs.append(self.exponential_sleep)
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116
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117 if wait_func is not None:
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118 self.wait = wait_func
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119
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120 elif wait is None:
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121 self.wait = lambda attempts, delay: max(f(attempts, delay) for f in wait_funcs)
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122
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123 else:
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124 self.wait = getattr(self, wait)
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125
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126 # retry on exception filter
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127 if retry_on_exception is None:
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128 self._retry_on_exception = self.always_reject
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129 else:
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130 self._retry_on_exception = retry_on_exception
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131
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132 # TODO simplify retrying by Exception types
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133 # retry on result filter
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134 if retry_on_result is None:
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135 self._retry_on_result = self.never_reject
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136 else:
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137 self._retry_on_result = retry_on_result
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138
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139 self._wrap_exception = wrap_exception
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140
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141 def stop_after_attempt(self, previous_attempt_number, delay_since_first_attempt_ms):
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142 """Stop after the previous attempt >= stop_max_attempt_number."""
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143 return previous_attempt_number >= self._stop_max_attempt_number
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144
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145 def stop_after_delay(self, previous_attempt_number, delay_since_first_attempt_ms):
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146 """Stop after the time from the first attempt >= stop_max_delay."""
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147 return delay_since_first_attempt_ms >= self._stop_max_delay
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148
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149 def no_sleep(self, previous_attempt_number, delay_since_first_attempt_ms):
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150 """Don't sleep at all before retrying."""
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151 return 0
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152
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153 def fixed_sleep(self, previous_attempt_number, delay_since_first_attempt_ms):
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154 """Sleep a fixed amount of time between each retry."""
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155 return self._wait_fixed
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156
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157 def random_sleep(self, previous_attempt_number, delay_since_first_attempt_ms):
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158 """Sleep a random amount of time between wait_random_min and wait_random_max"""
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159 return random.randint(self._wait_random_min, self._wait_random_max)
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160
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161 def incrementing_sleep(self, previous_attempt_number, delay_since_first_attempt_ms):
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162 """
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163 Sleep an incremental amount of time after each attempt, starting at
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164 wait_incrementing_start and incrementing by wait_incrementing_increment
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165 """
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166 result = self._wait_incrementing_start + (self._wait_incrementing_increment * (previous_attempt_number - 1))
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167 if result < 0:
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168 result = 0
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169 return result
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170
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171 def exponential_sleep(self, previous_attempt_number, delay_since_first_attempt_ms):
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172 exp = 2 ** previous_attempt_number
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173 result = self._wait_exponential_multiplier * exp
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174 if result > self._wait_exponential_max:
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175 result = self._wait_exponential_max
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176 if result < 0:
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177 result = 0
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178 return result
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179
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180 def never_reject(self, result):
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181 return False
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182
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183 def always_reject(self, result):
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184 return True
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185
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186 def should_reject(self, attempt):
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187 reject = False
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188 if attempt.has_exception:
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189 reject |= self._retry_on_exception(attempt.value[1])
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190 else:
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191 reject |= self._retry_on_result(attempt.value)
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192
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193 return reject
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194
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195 def call(self, fn, *args, **kwargs):
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196 start_time = int(round(time.time() * 1000))
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197 attempt_number = 1
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198 while True:
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199 try:
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200 attempt = Attempt(fn(*args, **kwargs), attempt_number, False)
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201 except:
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202 tb = sys.exc_info()
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203 attempt = Attempt(tb, attempt_number, True)
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204
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205 if not self.should_reject(attempt):
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206 return attempt.get(self._wrap_exception)
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207
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208 delay_since_first_attempt_ms = int(round(time.time() * 1000)) - start_time
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209 if self.stop(attempt_number, delay_since_first_attempt_ms):
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210 if not self._wrap_exception and attempt.has_exception:
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211 # get() on an attempt with an exception should cause it to be raised, but raise just in case
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212 raise attempt.get()
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213 else:
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214 raise RetryError(attempt)
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215 else:
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216 sleep = self.wait(attempt_number, delay_since_first_attempt_ms)
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217 if self._wait_jitter_max:
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218 jitter = random.random() * self._wait_jitter_max
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219 sleep = sleep + max(0, jitter)
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220 time.sleep(sleep / 1000.0)
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221
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222 attempt_number += 1
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223
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224
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225 class Attempt(object):
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226 """
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227 An Attempt encapsulates a call to a target function that may end as a
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228 normal return value from the function or an Exception depending on what
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229 occurred during the execution.
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230 """
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231
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232 def __init__(self, value, attempt_number, has_exception):
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233 self.value = value
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234 self.attempt_number = attempt_number
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235 self.has_exception = has_exception
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236
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237 def get(self, wrap_exception=False):
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238 """
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239 Return the return value of this Attempt instance or raise an Exception.
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240 If wrap_exception is true, this Attempt is wrapped inside of a
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241 RetryError before being raised.
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242 """
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243 if self.has_exception:
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244 if wrap_exception:
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245 raise RetryError(self)
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246 else:
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247 six.reraise(self.value[0], self.value[1], self.value[2])
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248 else:
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249 return self.value
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250
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251 def __repr__(self):
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252 if self.has_exception:
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253 return "Attempts: {0}, Error:\n{1}".format(self.attempt_number, "".join(traceback.format_tb(self.value[2])))
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254 else:
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255 return "Attempts: {0}, Value: {1}".format(self.attempt_number, self.value)
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256
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257
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258 class RetryError(Exception):
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259 """
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260 A RetryError encapsulates the last Attempt instance right before giving up.
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261 """
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262
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263 def __init__(self, last_attempt):
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264 self.last_attempt = last_attempt
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265
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266 def __str__(self):
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267 return "RetryError[{0}]".format(self.last_attempt)