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annotate planemo/lib/python3.7/site-packages/urllib3/util/retry.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 from __future__ import absolute_import
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2 import time
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3 import logging
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4 from collections import namedtuple
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5 from itertools import takewhile
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6 import email
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7 import re
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8
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9 from ..exceptions import (
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10 ConnectTimeoutError,
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11 MaxRetryError,
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12 ProtocolError,
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13 ReadTimeoutError,
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14 ResponseError,
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15 InvalidHeader,
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16 ProxyError,
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17 )
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18 from ..packages import six
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19
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20
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21 log = logging.getLogger(__name__)
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22
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23
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24 # Data structure for representing the metadata of requests that result in a retry.
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25 RequestHistory = namedtuple(
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26 "RequestHistory", ["method", "url", "error", "status", "redirect_location"]
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27 )
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29
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30 class Retry(object):
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31 """ Retry configuration.
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32
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33 Each retry attempt will create a new Retry object with updated values, so
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34 they can be safely reused.
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35
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36 Retries can be defined as a default for a pool::
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37
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38 retries = Retry(connect=5, read=2, redirect=5)
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39 http = PoolManager(retries=retries)
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40 response = http.request('GET', 'http://example.com/')
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41
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42 Or per-request (which overrides the default for the pool)::
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43
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44 response = http.request('GET', 'http://example.com/', retries=Retry(10))
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45
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46 Retries can be disabled by passing ``False``::
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47
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48 response = http.request('GET', 'http://example.com/', retries=False)
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49
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50 Errors will be wrapped in :class:`~urllib3.exceptions.MaxRetryError` unless
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51 retries are disabled, in which case the causing exception will be raised.
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52
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53 :param int total:
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54 Total number of retries to allow. Takes precedence over other counts.
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55
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56 Set to ``None`` to remove this constraint and fall back on other
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57 counts. It's a good idea to set this to some sensibly-high value to
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58 account for unexpected edge cases and avoid infinite retry loops.
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59
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60 Set to ``0`` to fail on the first retry.
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61
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62 Set to ``False`` to disable and imply ``raise_on_redirect=False``.
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63
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64 :param int connect:
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65 How many connection-related errors to retry on.
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66
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67 These are errors raised before the request is sent to the remote server,
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68 which we assume has not triggered the server to process the request.
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69
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70 Set to ``0`` to fail on the first retry of this type.
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71
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72 :param int read:
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73 How many times to retry on read errors.
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74
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75 These errors are raised after the request was sent to the server, so the
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76 request may have side-effects.
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77
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78 Set to ``0`` to fail on the first retry of this type.
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79
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80 :param int redirect:
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81 How many redirects to perform. Limit this to avoid infinite redirect
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82 loops.
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83
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84 A redirect is a HTTP response with a status code 301, 302, 303, 307 or
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85 308.
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86
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87 Set to ``0`` to fail on the first retry of this type.
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88
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89 Set to ``False`` to disable and imply ``raise_on_redirect=False``.
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90
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91 :param int status:
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92 How many times to retry on bad status codes.
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93
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94 These are retries made on responses, where status code matches
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95 ``status_forcelist``.
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96
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97 Set to ``0`` to fail on the first retry of this type.
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98
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99 :param iterable method_whitelist:
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100 Set of uppercased HTTP method verbs that we should retry on.
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101
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102 By default, we only retry on methods which are considered to be
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103 idempotent (multiple requests with the same parameters end with the
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104 same state). See :attr:`Retry.DEFAULT_METHOD_WHITELIST`.
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105
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106 Set to a ``False`` value to retry on any verb.
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107
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108 :param iterable status_forcelist:
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109 A set of integer HTTP status codes that we should force a retry on.
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110 A retry is initiated if the request method is in ``method_whitelist``
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111 and the response status code is in ``status_forcelist``.
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112
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113 By default, this is disabled with ``None``.
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114
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115 :param float backoff_factor:
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116 A backoff factor to apply between attempts after the second try
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117 (most errors are resolved immediately by a second try without a
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118 delay). urllib3 will sleep for::
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119
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120 {backoff factor} * (2 ** ({number of total retries} - 1))
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121
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122 seconds. If the backoff_factor is 0.1, then :func:`.sleep` will sleep
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123 for [0.0s, 0.2s, 0.4s, ...] between retries. It will never be longer
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124 than :attr:`Retry.BACKOFF_MAX`.
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125
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126 By default, backoff is disabled (set to 0).
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127
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128 :param bool raise_on_redirect: Whether, if the number of redirects is
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129 exhausted, to raise a MaxRetryError, or to return a response with a
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130 response code in the 3xx range.
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131
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132 :param bool raise_on_status: Similar meaning to ``raise_on_redirect``:
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133 whether we should raise an exception, or return a response,
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134 if status falls in ``status_forcelist`` range and retries have
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135 been exhausted.
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136
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137 :param tuple history: The history of the request encountered during
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138 each call to :meth:`~Retry.increment`. The list is in the order
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139 the requests occurred. Each list item is of class :class:`RequestHistory`.
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140
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141 :param bool respect_retry_after_header:
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142 Whether to respect Retry-After header on status codes defined as
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143 :attr:`Retry.RETRY_AFTER_STATUS_CODES` or not.
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144
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145 :param iterable remove_headers_on_redirect:
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146 Sequence of headers to remove from the request when a response
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147 indicating a redirect is returned before firing off the redirected
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148 request.
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149 """
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150
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151 DEFAULT_METHOD_WHITELIST = frozenset(
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152 ["HEAD", "GET", "PUT", "DELETE", "OPTIONS", "TRACE"]
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153 )
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154
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155 RETRY_AFTER_STATUS_CODES = frozenset([413, 429, 503])
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156
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157 DEFAULT_REDIRECT_HEADERS_BLACKLIST = frozenset(["Authorization"])
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158
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159 #: Maximum backoff time.
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160 BACKOFF_MAX = 120
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161
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162 def __init__(
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163 self,
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164 total=10,
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165 connect=None,
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166 read=None,
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167 redirect=None,
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168 status=None,
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169 method_whitelist=DEFAULT_METHOD_WHITELIST,
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170 status_forcelist=None,
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171 backoff_factor=0,
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172 raise_on_redirect=True,
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173 raise_on_status=True,
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174 history=None,
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175 respect_retry_after_header=True,
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176 remove_headers_on_redirect=DEFAULT_REDIRECT_HEADERS_BLACKLIST,
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177 ):
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178
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179 self.total = total
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180 self.connect = connect
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181 self.read = read
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182 self.status = status
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183
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184 if redirect is False or total is False:
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185 redirect = 0
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186 raise_on_redirect = False
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187
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188 self.redirect = redirect
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189 self.status_forcelist = status_forcelist or set()
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190 self.method_whitelist = method_whitelist
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191 self.backoff_factor = backoff_factor
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192 self.raise_on_redirect = raise_on_redirect
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193 self.raise_on_status = raise_on_status
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194 self.history = history or tuple()
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195 self.respect_retry_after_header = respect_retry_after_header
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196 self.remove_headers_on_redirect = frozenset(
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197 [h.lower() for h in remove_headers_on_redirect]
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198 )
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199
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200 def new(self, **kw):
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201 params = dict(
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202 total=self.total,
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203 connect=self.connect,
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204 read=self.read,
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205 redirect=self.redirect,
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206 status=self.status,
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207 method_whitelist=self.method_whitelist,
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208 status_forcelist=self.status_forcelist,
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209 backoff_factor=self.backoff_factor,
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210 raise_on_redirect=self.raise_on_redirect,
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211 raise_on_status=self.raise_on_status,
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212 history=self.history,
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213 remove_headers_on_redirect=self.remove_headers_on_redirect,
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214 respect_retry_after_header=self.respect_retry_after_header,
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215 )
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216 params.update(kw)
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217 return type(self)(**params)
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218
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219 @classmethod
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220 def from_int(cls, retries, redirect=True, default=None):
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221 """ Backwards-compatibility for the old retries format."""
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222 if retries is None:
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223 retries = default if default is not None else cls.DEFAULT
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224
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225 if isinstance(retries, Retry):
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226 return retries
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227
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228 redirect = bool(redirect) and None
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229 new_retries = cls(retries, redirect=redirect)
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230 log.debug("Converted retries value: %r -> %r", retries, new_retries)
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231 return new_retries
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232
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233 def get_backoff_time(self):
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234 """ Formula for computing the current backoff
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235
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236 :rtype: float
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237 """
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238 # We want to consider only the last consecutive errors sequence (Ignore redirects).
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239 consecutive_errors_len = len(
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240 list(
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241 takewhile(lambda x: x.redirect_location is None, reversed(self.history))
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242 )
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243 )
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244 if consecutive_errors_len <= 1:
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245 return 0
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246
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247 backoff_value = self.backoff_factor * (2 ** (consecutive_errors_len - 1))
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248 return min(self.BACKOFF_MAX, backoff_value)
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249
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250 def parse_retry_after(self, retry_after):
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251 # Whitespace: https://tools.ietf.org/html/rfc7230#section-3.2.4
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252 if re.match(r"^\s*[0-9]+\s*$", retry_after):
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253 seconds = int(retry_after)
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254 else:
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255 retry_date_tuple = email.utils.parsedate(retry_after)
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256 if retry_date_tuple is None:
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257 raise InvalidHeader("Invalid Retry-After header: %s" % retry_after)
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258 retry_date = time.mktime(retry_date_tuple)
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259 seconds = retry_date - time.time()
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260
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261 if seconds < 0:
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262 seconds = 0
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263
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264 return seconds
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265
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266 def get_retry_after(self, response):
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267 """ Get the value of Retry-After in seconds. """
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268
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269 retry_after = response.getheader("Retry-After")
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270
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271 if retry_after is None:
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272 return None
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273
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274 return self.parse_retry_after(retry_after)
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275
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276 def sleep_for_retry(self, response=None):
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277 retry_after = self.get_retry_after(response)
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278 if retry_after:
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279 time.sleep(retry_after)
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280 return True
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281
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282 return False
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283
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284 def _sleep_backoff(self):
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285 backoff = self.get_backoff_time()
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286 if backoff <= 0:
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287 return
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288 time.sleep(backoff)
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289
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290 def sleep(self, response=None):
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291 """ Sleep between retry attempts.
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292
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293 This method will respect a server's ``Retry-After`` response header
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294 and sleep the duration of the time requested. If that is not present, it
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295 will use an exponential backoff. By default, the backoff factor is 0 and
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296 this method will return immediately.
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297 """
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298
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299 if self.respect_retry_after_header and response:
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300 slept = self.sleep_for_retry(response)
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301 if slept:
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302 return
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303
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304 self._sleep_backoff()
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305
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306 def _is_connection_error(self, err):
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307 """ Errors when we're fairly sure that the server did not receive the
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308 request, so it should be safe to retry.
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309 """
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310 if isinstance(err, ProxyError):
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311 err = err.original_error
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312 return isinstance(err, ConnectTimeoutError)
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313
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314 def _is_read_error(self, err):
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315 """ Errors that occur after the request has been started, so we should
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316 assume that the server began processing it.
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317 """
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318 return isinstance(err, (ReadTimeoutError, ProtocolError))
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319
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320 def _is_method_retryable(self, method):
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321 """ Checks if a given HTTP method should be retried upon, depending if
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322 it is included on the method whitelist.
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323 """
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324 if self.method_whitelist and method.upper() not in self.method_whitelist:
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325 return False
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326
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327 return True
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328
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329 def is_retry(self, method, status_code, has_retry_after=False):
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330 """ Is this method/status code retryable? (Based on whitelists and control
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331 variables such as the number of total retries to allow, whether to
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332 respect the Retry-After header, whether this header is present, and
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333 whether the returned status code is on the list of status codes to
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334 be retried upon on the presence of the aforementioned header)
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335 """
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336 if not self._is_method_retryable(method):
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337 return False
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338
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339 if self.status_forcelist and status_code in self.status_forcelist:
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340 return True
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341
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342 return (
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343 self.total
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344 and self.respect_retry_after_header
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345 and has_retry_after
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346 and (status_code in self.RETRY_AFTER_STATUS_CODES)
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347 )
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348
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349 def is_exhausted(self):
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350 """ Are we out of retries? """
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351 retry_counts = (self.total, self.connect, self.read, self.redirect, self.status)
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352 retry_counts = list(filter(None, retry_counts))
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353 if not retry_counts:
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354 return False
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355
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356 return min(retry_counts) < 0
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357
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358 def increment(
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359 self,
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360 method=None,
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361 url=None,
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362 response=None,
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363 error=None,
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364 _pool=None,
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365 _stacktrace=None,
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366 ):
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367 """ Return a new Retry object with incremented retry counters.
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368
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369 :param response: A response object, or None, if the server did not
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370 return a response.
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371 :type response: :class:`~urllib3.response.HTTPResponse`
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372 :param Exception error: An error encountered during the request, or
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373 None if the response was received successfully.
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374
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375 :return: A new ``Retry`` object.
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376 """
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377 if self.total is False and error:
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378 # Disabled, indicate to re-raise the error.
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379 raise six.reraise(type(error), error, _stacktrace)
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380
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381 total = self.total
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382 if total is not None:
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383 total -= 1
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384
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385 connect = self.connect
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386 read = self.read
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387 redirect = self.redirect
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388 status_count = self.status
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389 cause = "unknown"
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390 status = None
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391 redirect_location = None
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392
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393 if error and self._is_connection_error(error):
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394 # Connect retry?
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395 if connect is False:
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396 raise six.reraise(type(error), error, _stacktrace)
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397 elif connect is not None:
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398 connect -= 1
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399
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400 elif error and self._is_read_error(error):
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401 # Read retry?
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402 if read is False or not self._is_method_retryable(method):
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403 raise six.reraise(type(error), error, _stacktrace)
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404 elif read is not None:
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405 read -= 1
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406
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407 elif response and response.get_redirect_location():
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408 # Redirect retry?
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409 if redirect is not None:
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410 redirect -= 1
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411 cause = "too many redirects"
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412 redirect_location = response.get_redirect_location()
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413 status = response.status
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414
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415 else:
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416 # Incrementing because of a server error like a 500 in
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417 # status_forcelist and a the given method is in the whitelist
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418 cause = ResponseError.GENERIC_ERROR
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419 if response and response.status:
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420 if status_count is not None:
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421 status_count -= 1
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422 cause = ResponseError.SPECIFIC_ERROR.format(status_code=response.status)
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423 status = response.status
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424
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425 history = self.history + (
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426 RequestHistory(method, url, error, status, redirect_location),
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427 )
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428
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429 new_retry = self.new(
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430 total=total,
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431 connect=connect,
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432 read=read,
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433 redirect=redirect,
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434 status=status_count,
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435 history=history,
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436 )
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437
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438 if new_retry.is_exhausted():
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439 raise MaxRetryError(_pool, url, error or ResponseError(cause))
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440
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441 log.debug("Incremented Retry for (url='%s'): %r", url, new_retry)
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442
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443 return new_retry
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444
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445 def __repr__(self):
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446 return (
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447 "{cls.__name__}(total={self.total}, connect={self.connect}, "
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448 "read={self.read}, redirect={self.redirect}, status={self.status})"
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449 ).format(cls=type(self), self=self)
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450
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451
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452 # For backwards compatibility (equivalent to pre-v1.9):
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453 Retry.DEFAULT = Retry(3)