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annotate env/lib/python3.9/site-packages/urllib3/util/retry.py @ 0:4f3585e2f14b draft default tip

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"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
author shellac
date Mon, 22 Mar 2021 18:12:50 +0000
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1 from __future__ import absolute_import
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2
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3 import email
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4 import logging
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5 import re
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6 import time
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7 import warnings
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8 from collections import namedtuple
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9 from itertools import takewhile
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10
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11 from ..exceptions import (
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12 ConnectTimeoutError,
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13 InvalidHeader,
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14 MaxRetryError,
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15 ProtocolError,
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16 ProxyError,
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17 ReadTimeoutError,
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18 ResponseError,
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19 )
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20 from ..packages import six
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21
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22 log = logging.getLogger(__name__)
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23
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24
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25 # Data structure for representing the metadata of requests that result in a retry.
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26 RequestHistory = namedtuple(
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27 "RequestHistory", ["method", "url", "error", "status", "redirect_location"]
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28 )
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29
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30
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31 # TODO: In v2 we can remove this sentinel and metaclass with deprecated options.
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32 _Default = object()
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33
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34
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35 class _RetryMeta(type):
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36 @property
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37 def DEFAULT_METHOD_WHITELIST(cls):
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38 warnings.warn(
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39 "Using 'Retry.DEFAULT_METHOD_WHITELIST' is deprecated and "
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40 "will be removed in v2.0. Use 'Retry.DEFAULT_METHODS_ALLOWED' instead",
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41 DeprecationWarning,
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42 )
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43 return cls.DEFAULT_ALLOWED_METHODS
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44
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45 @DEFAULT_METHOD_WHITELIST.setter
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46 def DEFAULT_METHOD_WHITELIST(cls, value):
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47 warnings.warn(
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48 "Using 'Retry.DEFAULT_METHOD_WHITELIST' is deprecated and "
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49 "will be removed in v2.0. Use 'Retry.DEFAULT_ALLOWED_METHODS' instead",
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50 DeprecationWarning,
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51 )
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52 cls.DEFAULT_ALLOWED_METHODS = value
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53
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54 @property
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55 def DEFAULT_REDIRECT_HEADERS_BLACKLIST(cls):
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56 warnings.warn(
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57 "Using 'Retry.DEFAULT_REDIRECT_HEADERS_BLACKLIST' is deprecated and "
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58 "will be removed in v2.0. Use 'Retry.DEFAULT_REMOVE_HEADERS_ON_REDIRECT' instead",
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59 DeprecationWarning,
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60 )
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61 return cls.DEFAULT_REMOVE_HEADERS_ON_REDIRECT
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62
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63 @DEFAULT_REDIRECT_HEADERS_BLACKLIST.setter
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64 def DEFAULT_REDIRECT_HEADERS_BLACKLIST(cls, value):
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65 warnings.warn(
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66 "Using 'Retry.DEFAULT_REDIRECT_HEADERS_BLACKLIST' is deprecated and "
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67 "will be removed in v2.0. Use 'Retry.DEFAULT_REMOVE_HEADERS_ON_REDIRECT' instead",
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68 DeprecationWarning,
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69 )
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70 cls.DEFAULT_REMOVE_HEADERS_ON_REDIRECT = value
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71
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72
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73 @six.add_metaclass(_RetryMeta)
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74 class Retry(object):
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75 """Retry configuration.
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76
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77 Each retry attempt will create a new Retry object with updated values, so
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78 they can be safely reused.
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79
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80 Retries can be defined as a default for a pool::
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81
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82 retries = Retry(connect=5, read=2, redirect=5)
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83 http = PoolManager(retries=retries)
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84 response = http.request('GET', 'http://example.com/')
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85
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86 Or per-request (which overrides the default for the pool)::
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87
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88 response = http.request('GET', 'http://example.com/', retries=Retry(10))
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89
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90 Retries can be disabled by passing ``False``::
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91
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92 response = http.request('GET', 'http://example.com/', retries=False)
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93
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94 Errors will be wrapped in :class:`~urllib3.exceptions.MaxRetryError` unless
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95 retries are disabled, in which case the causing exception will be raised.
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96
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97 :param int total:
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98 Total number of retries to allow. Takes precedence over other counts.
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99
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100 Set to ``None`` to remove this constraint and fall back on other
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101 counts.
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102
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103 Set to ``0`` to fail on the first retry.
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104
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105 Set to ``False`` to disable and imply ``raise_on_redirect=False``.
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106
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107 :param int connect:
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108 How many connection-related errors to retry on.
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109
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110 These are errors raised before the request is sent to the remote server,
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111 which we assume has not triggered the server to process the request.
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112
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113 Set to ``0`` to fail on the first retry of this type.
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114
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115 :param int read:
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116 How many times to retry on read errors.
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117
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118 These errors are raised after the request was sent to the server, so the
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119 request may have side-effects.
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120
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121 Set to ``0`` to fail on the first retry of this type.
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122
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123 :param int redirect:
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124 How many redirects to perform. Limit this to avoid infinite redirect
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125 loops.
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126
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127 A redirect is a HTTP response with a status code 301, 302, 303, 307 or
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128 308.
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129
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130 Set to ``0`` to fail on the first retry of this type.
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131
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132 Set to ``False`` to disable and imply ``raise_on_redirect=False``.
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133
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134 :param int status:
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135 How many times to retry on bad status codes.
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136
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137 These are retries made on responses, where status code matches
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138 ``status_forcelist``.
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139
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140 Set to ``0`` to fail on the first retry of this type.
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141
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142 :param int other:
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143 How many times to retry on other errors.
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144
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145 Other errors are errors that are not connect, read, redirect or status errors.
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146 These errors might be raised after the request was sent to the server, so the
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147 request might have side-effects.
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148
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149 Set to ``0`` to fail on the first retry of this type.
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150
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151 If ``total`` is not set, it's a good idea to set this to 0 to account
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152 for unexpected edge cases and avoid infinite retry loops.
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153
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154 :param iterable allowed_methods:
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155 Set of uppercased HTTP method verbs that we should retry on.
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156
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157 By default, we only retry on methods which are considered to be
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158 idempotent (multiple requests with the same parameters end with the
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159 same state). See :attr:`Retry.DEFAULT_ALLOWED_METHODS`.
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160
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161 Set to a ``False`` value to retry on any verb.
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162
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163 .. warning::
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164
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165 Previously this parameter was named ``method_whitelist``, that
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166 usage is deprecated in v1.26.0 and will be removed in v2.0.
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167
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168 :param iterable status_forcelist:
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169 A set of integer HTTP status codes that we should force a retry on.
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170 A retry is initiated if the request method is in ``allowed_methods``
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171 and the response status code is in ``status_forcelist``.
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172
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173 By default, this is disabled with ``None``.
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174
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175 :param float backoff_factor:
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176 A backoff factor to apply between attempts after the second try
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177 (most errors are resolved immediately by a second try without a
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178 delay). urllib3 will sleep for::
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179
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180 {backoff factor} * (2 ** ({number of total retries} - 1))
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181
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182 seconds. If the backoff_factor is 0.1, then :func:`.sleep` will sleep
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183 for [0.0s, 0.2s, 0.4s, ...] between retries. It will never be longer
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184 than :attr:`Retry.BACKOFF_MAX`.
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185
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186 By default, backoff is disabled (set to 0).
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187
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188 :param bool raise_on_redirect: Whether, if the number of redirects is
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189 exhausted, to raise a MaxRetryError, or to return a response with a
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190 response code in the 3xx range.
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191
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192 :param bool raise_on_status: Similar meaning to ``raise_on_redirect``:
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193 whether we should raise an exception, or return a response,
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194 if status falls in ``status_forcelist`` range and retries have
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195 been exhausted.
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196
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197 :param tuple history: The history of the request encountered during
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198 each call to :meth:`~Retry.increment`. The list is in the order
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199 the requests occurred. Each list item is of class :class:`RequestHistory`.
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200
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201 :param bool respect_retry_after_header:
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202 Whether to respect Retry-After header on status codes defined as
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203 :attr:`Retry.RETRY_AFTER_STATUS_CODES` or not.
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204
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205 :param iterable remove_headers_on_redirect:
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206 Sequence of headers to remove from the request when a response
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207 indicating a redirect is returned before firing off the redirected
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208 request.
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209 """
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210
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211 #: Default methods to be used for ``allowed_methods``
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212 DEFAULT_ALLOWED_METHODS = frozenset(
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213 ["HEAD", "GET", "PUT", "DELETE", "OPTIONS", "TRACE"]
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214 )
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215
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216 #: Default status codes to be used for ``status_forcelist``
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217 RETRY_AFTER_STATUS_CODES = frozenset([413, 429, 503])
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218
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219 #: Default headers to be used for ``remove_headers_on_redirect``
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220 DEFAULT_REMOVE_HEADERS_ON_REDIRECT = frozenset(["Authorization"])
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221
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222 #: Maximum backoff time.
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223 BACKOFF_MAX = 120
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224
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225 def __init__(
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226 self,
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227 total=10,
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228 connect=None,
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229 read=None,
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230 redirect=None,
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231 status=None,
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232 other=None,
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233 allowed_methods=_Default,
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234 status_forcelist=None,
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235 backoff_factor=0,
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236 raise_on_redirect=True,
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237 raise_on_status=True,
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238 history=None,
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239 respect_retry_after_header=True,
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240 remove_headers_on_redirect=_Default,
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241 # TODO: Deprecated, remove in v2.0
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242 method_whitelist=_Default,
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243 ):
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244
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245 if method_whitelist is not _Default:
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246 if allowed_methods is not _Default:
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247 raise ValueError(
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248 "Using both 'allowed_methods' and "
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249 "'method_whitelist' together is not allowed. "
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250 "Instead only use 'allowed_methods'"
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251 )
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252 warnings.warn(
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253 "Using 'method_whitelist' with Retry is deprecated and "
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254 "will be removed in v2.0. Use 'allowed_methods' instead",
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255 DeprecationWarning,
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256 stacklevel=2,
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257 )
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258 allowed_methods = method_whitelist
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259 if allowed_methods is _Default:
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260 allowed_methods = self.DEFAULT_ALLOWED_METHODS
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261 if remove_headers_on_redirect is _Default:
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262 remove_headers_on_redirect = self.DEFAULT_REMOVE_HEADERS_ON_REDIRECT
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263
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264 self.total = total
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265 self.connect = connect
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266 self.read = read
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267 self.status = status
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268 self.other = other
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269
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270 if redirect is False or total is False:
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271 redirect = 0
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272 raise_on_redirect = False
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273
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274 self.redirect = redirect
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275 self.status_forcelist = status_forcelist or set()
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276 self.allowed_methods = allowed_methods
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277 self.backoff_factor = backoff_factor
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278 self.raise_on_redirect = raise_on_redirect
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279 self.raise_on_status = raise_on_status
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280 self.history = history or tuple()
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281 self.respect_retry_after_header = respect_retry_after_header
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282 self.remove_headers_on_redirect = frozenset(
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283 [h.lower() for h in remove_headers_on_redirect]
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284 )
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285
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286 def new(self, **kw):
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287 params = dict(
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288 total=self.total,
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289 connect=self.connect,
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290 read=self.read,
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291 redirect=self.redirect,
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292 status=self.status,
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293 other=self.other,
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294 status_forcelist=self.status_forcelist,
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295 backoff_factor=self.backoff_factor,
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296 raise_on_redirect=self.raise_on_redirect,
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297 raise_on_status=self.raise_on_status,
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298 history=self.history,
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299 remove_headers_on_redirect=self.remove_headers_on_redirect,
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300 respect_retry_after_header=self.respect_retry_after_header,
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301 )
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302
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303 # TODO: If already given in **kw we use what's given to us
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304 # If not given we need to figure out what to pass. We decide
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305 # based on whether our class has the 'method_whitelist' property
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306 # and if so we pass the deprecated 'method_whitelist' otherwise
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307 # we use 'allowed_methods'. Remove in v2.0
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308 if "method_whitelist" not in kw and "allowed_methods" not in kw:
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309 if "method_whitelist" in self.__dict__:
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310 warnings.warn(
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311 "Using 'method_whitelist' with Retry is deprecated and "
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312 "will be removed in v2.0. Use 'allowed_methods' instead",
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313 DeprecationWarning,
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314 )
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315 params["method_whitelist"] = self.allowed_methods
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316 else:
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317 params["allowed_methods"] = self.allowed_methods
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318
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319 params.update(kw)
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320 return type(self)(**params)
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321
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322 @classmethod
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323 def from_int(cls, retries, redirect=True, default=None):
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324 """ Backwards-compatibility for the old retries format."""
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325 if retries is None:
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326 retries = default if default is not None else cls.DEFAULT
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327
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328 if isinstance(retries, Retry):
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329 return retries
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330
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331 redirect = bool(redirect) and None
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332 new_retries = cls(retries, redirect=redirect)
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333 log.debug("Converted retries value: %r -> %r", retries, new_retries)
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334 return new_retries
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335
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336 def get_backoff_time(self):
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337 """Formula for computing the current backoff
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338
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339 :rtype: float
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340 """
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341 # We want to consider only the last consecutive errors sequence (Ignore redirects).
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342 consecutive_errors_len = len(
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343 list(
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344 takewhile(lambda x: x.redirect_location is None, reversed(self.history))
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345 )
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346 )
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347 if consecutive_errors_len <= 1:
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348 return 0
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349
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350 backoff_value = self.backoff_factor * (2 ** (consecutive_errors_len - 1))
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351 return min(self.BACKOFF_MAX, backoff_value)
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352
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353 def parse_retry_after(self, retry_after):
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354 # Whitespace: https://tools.ietf.org/html/rfc7230#section-3.2.4
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355 if re.match(r"^\s*[0-9]+\s*$", retry_after):
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356 seconds = int(retry_after)
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357 else:
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358 retry_date_tuple = email.utils.parsedate_tz(retry_after)
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359 if retry_date_tuple is None:
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360 raise InvalidHeader("Invalid Retry-After header: %s" % retry_after)
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361 if retry_date_tuple[9] is None: # Python 2
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362 # Assume UTC if no timezone was specified
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363 # On Python2.7, parsedate_tz returns None for a timezone offset
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364 # instead of 0 if no timezone is given, where mktime_tz treats
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365 # a None timezone offset as local time.
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366 retry_date_tuple = retry_date_tuple[:9] + (0,) + retry_date_tuple[10:]
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367
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368 retry_date = email.utils.mktime_tz(retry_date_tuple)
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369 seconds = retry_date - time.time()
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370
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371 if seconds < 0:
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372 seconds = 0
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373
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374 return seconds
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375
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376 def get_retry_after(self, response):
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377 """ Get the value of Retry-After in seconds. """
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378
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379 retry_after = response.getheader("Retry-After")
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380
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381 if retry_after is None:
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382 return None
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383
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384 return self.parse_retry_after(retry_after)
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385
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386 def sleep_for_retry(self, response=None):
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387 retry_after = self.get_retry_after(response)
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388 if retry_after:
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389 time.sleep(retry_after)
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390 return True
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391
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392 return False
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393
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394 def _sleep_backoff(self):
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395 backoff = self.get_backoff_time()
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396 if backoff <= 0:
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397 return
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398 time.sleep(backoff)
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399
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400 def sleep(self, response=None):
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401 """Sleep between retry attempts.
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402
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403 This method will respect a server's ``Retry-After`` response header
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404 and sleep the duration of the time requested. If that is not present, it
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405 will use an exponential backoff. By default, the backoff factor is 0 and
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406 this method will return immediately.
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407 """
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408
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409 if self.respect_retry_after_header and response:
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410 slept = self.sleep_for_retry(response)
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parents:
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411 if slept:
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parents:
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412 return
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413
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414 self._sleep_backoff()
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415
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416 def _is_connection_error(self, err):
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417 """Errors when we're fairly sure that the server did not receive the
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418 request, so it should be safe to retry.
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419 """
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420 if isinstance(err, ProxyError):
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421 err = err.original_error
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422 return isinstance(err, ConnectTimeoutError)
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423
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424 def _is_read_error(self, err):
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425 """Errors that occur after the request has been started, so we should
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parents:
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426 assume that the server began processing it.
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427 """
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428 return isinstance(err, (ReadTimeoutError, ProtocolError))
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429
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430 def _is_method_retryable(self, method):
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431 """Checks if a given HTTP method should be retried upon, depending if
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432 it is included in the allowed_methods
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433 """
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434 # TODO: For now favor if the Retry implementation sets its own method_whitelist
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435 # property outside of our constructor to avoid breaking custom implementations.
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436 if "method_whitelist" in self.__dict__:
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437 warnings.warn(
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438 "Using 'method_whitelist' with Retry is deprecated and "
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439 "will be removed in v2.0. Use 'allowed_methods' instead",
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440 DeprecationWarning,
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441 )
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442 allowed_methods = self.method_whitelist
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443 else:
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444 allowed_methods = self.allowed_methods
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445
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446 if allowed_methods and method.upper() not in allowed_methods:
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447 return False
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448 return True
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449
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450 def is_retry(self, method, status_code, has_retry_after=False):
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451 """Is this method/status code retryable? (Based on allowlists and control
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452 variables such as the number of total retries to allow, whether to
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453 respect the Retry-After header, whether this header is present, and
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454 whether the returned status code is on the list of status codes to
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455 be retried upon on the presence of the aforementioned header)
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456 """
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457 if not self._is_method_retryable(method):
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458 return False
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459
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460 if self.status_forcelist and status_code in self.status_forcelist:
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461 return True
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462
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463 return (
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diff changeset
464 self.total
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465 and self.respect_retry_after_header
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466 and has_retry_after
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467 and (status_code in self.RETRY_AFTER_STATUS_CODES)
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parents:
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468 )
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parents:
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469
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470 def is_exhausted(self):
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parents:
diff changeset
471 """ Are we out of retries? """
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472 retry_counts = (
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diff changeset
473 self.total,
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parents:
diff changeset
474 self.connect,
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parents:
diff changeset
475 self.read,
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parents:
diff changeset
476 self.redirect,
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parents:
diff changeset
477 self.status,
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parents:
diff changeset
478 self.other,
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parents:
diff changeset
479 )
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480 retry_counts = list(filter(None, retry_counts))
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diff changeset
481 if not retry_counts:
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482 return False
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parents:
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483
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484 return min(retry_counts) < 0
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parents:
diff changeset
485
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486 def increment(
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diff changeset
487 self,
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488 method=None,
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489 url=None,
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490 response=None,
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parents:
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491 error=None,
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diff changeset
492 _pool=None,
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493 _stacktrace=None,
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494 ):
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495 """Return a new Retry object with incremented retry counters.
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parents:
diff changeset
496
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497 :param response: A response object, or None, if the server did not
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parents:
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498 return a response.
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499 :type response: :class:`~urllib3.response.HTTPResponse`
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500 :param Exception error: An error encountered during the request, or
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parents:
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501 None if the response was received successfully.
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parents:
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502
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503 :return: A new ``Retry`` object.
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parents:
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504 """
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parents:
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505 if self.total is False and error:
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parents:
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506 # Disabled, indicate to re-raise the error.
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parents:
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507 raise six.reraise(type(error), error, _stacktrace)
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508
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509 total = self.total
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510 if total is not None:
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511 total -= 1
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512
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513 connect = self.connect
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514 read = self.read
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515 redirect = self.redirect
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516 status_count = self.status
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517 other = self.other
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518 cause = "unknown"
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519 status = None
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520 redirect_location = None
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521
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522 if error and self._is_connection_error(error):
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523 # Connect retry?
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524 if connect is False:
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525 raise six.reraise(type(error), error, _stacktrace)
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526 elif connect is not None:
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527 connect -= 1
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528
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529 elif error and self._is_read_error(error):
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530 # Read retry?
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531 if read is False or not self._is_method_retryable(method):
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532 raise six.reraise(type(error), error, _stacktrace)
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533 elif read is not None:
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534 read -= 1
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535
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536 elif error:
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537 # Other retry?
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538 if other is not None:
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539 other -= 1
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540
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541 elif response and response.get_redirect_location():
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542 # Redirect retry?
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543 if redirect is not None:
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544 redirect -= 1
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545 cause = "too many redirects"
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546 redirect_location = response.get_redirect_location()
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547 status = response.status
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548
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549 else:
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550 # Incrementing because of a server error like a 500 in
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551 # status_forcelist and the given method is in the allowed_methods
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552 cause = ResponseError.GENERIC_ERROR
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553 if response and response.status:
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554 if status_count is not None:
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555 status_count -= 1
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556 cause = ResponseError.SPECIFIC_ERROR.format(status_code=response.status)
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557 status = response.status
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558
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559 history = self.history + (
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560 RequestHistory(method, url, error, status, redirect_location),
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561 )
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562
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563 new_retry = self.new(
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564 total=total,
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565 connect=connect,
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566 read=read,
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567 redirect=redirect,
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568 status=status_count,
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569 other=other,
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570 history=history,
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571 )
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572
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573 if new_retry.is_exhausted():
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574 raise MaxRetryError(_pool, url, error or ResponseError(cause))
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575
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576 log.debug("Incremented Retry for (url='%s'): %r", url, new_retry)
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577
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578 return new_retry
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579
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580 def __repr__(self):
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581 return (
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582 "{cls.__name__}(total={self.total}, connect={self.connect}, "
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583 "read={self.read}, redirect={self.redirect}, status={self.status})"
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584 ).format(cls=type(self), self=self)
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585
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586 def __getattr__(self, item):
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587 if item == "method_whitelist":
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588 # TODO: Remove this deprecated alias in v2.0
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589 warnings.warn(
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590 "Using 'method_whitelist' with Retry is deprecated and "
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591 "will be removed in v2.0. Use 'allowed_methods' instead",
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592 DeprecationWarning,
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593 )
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594 return self.allowed_methods
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595 try:
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596 return getattr(super(Retry, self), item)
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597 except AttributeError:
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598 return getattr(Retry, item)
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599
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600
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601 # For backwards compatibility (equivalent to pre-v1.9):
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602 Retry.DEFAULT = Retry(3)