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annotate planemo/lib/python3.7/site-packages/urllib3/contrib/appengine.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 """
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2 This module provides a pool manager that uses Google App Engine's
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3 `URLFetch Service <https://cloud.google.com/appengine/docs/python/urlfetch>`_.
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4
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5 Example usage::
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6
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7 from urllib3 import PoolManager
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8 from urllib3.contrib.appengine import AppEngineManager, is_appengine_sandbox
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9
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10 if is_appengine_sandbox():
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11 # AppEngineManager uses AppEngine's URLFetch API behind the scenes
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12 http = AppEngineManager()
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13 else:
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14 # PoolManager uses a socket-level API behind the scenes
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15 http = PoolManager()
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16
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17 r = http.request('GET', 'https://google.com/')
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18
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19 There are `limitations <https://cloud.google.com/appengine/docs/python/\
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20 urlfetch/#Python_Quotas_and_limits>`_ to the URLFetch service and it may not be
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21 the best choice for your application. There are three options for using
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22 urllib3 on Google App Engine:
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23
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24 1. You can use :class:`AppEngineManager` with URLFetch. URLFetch is
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25 cost-effective in many circumstances as long as your usage is within the
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26 limitations.
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27 2. You can use a normal :class:`~urllib3.PoolManager` by enabling sockets.
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28 Sockets also have `limitations and restrictions
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29 <https://cloud.google.com/appengine/docs/python/sockets/\
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30 #limitations-and-restrictions>`_ and have a lower free quota than URLFetch.
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31 To use sockets, be sure to specify the following in your ``app.yaml``::
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32
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33 env_variables:
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34 GAE_USE_SOCKETS_HTTPLIB : 'true'
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35
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36 3. If you are using `App Engine Flexible
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37 <https://cloud.google.com/appengine/docs/flexible/>`_, you can use the standard
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38 :class:`PoolManager` without any configuration or special environment variables.
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39 """
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40
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41 from __future__ import absolute_import
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42 import io
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43 import logging
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44 import warnings
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45 from ..packages.six.moves.urllib.parse import urljoin
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46
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47 from ..exceptions import (
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48 HTTPError,
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49 HTTPWarning,
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50 MaxRetryError,
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51 ProtocolError,
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52 TimeoutError,
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53 SSLError,
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54 )
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55
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56 from ..request import RequestMethods
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57 from ..response import HTTPResponse
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58 from ..util.timeout import Timeout
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59 from ..util.retry import Retry
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60 from . import _appengine_environ
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61
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62 try:
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63 from google.appengine.api import urlfetch
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64 except ImportError:
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65 urlfetch = None
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66
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67
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68 log = logging.getLogger(__name__)
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69
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70
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71 class AppEnginePlatformWarning(HTTPWarning):
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72 pass
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73
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74
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75 class AppEnginePlatformError(HTTPError):
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76 pass
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78
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79 class AppEngineManager(RequestMethods):
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80 """
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81 Connection manager for Google App Engine sandbox applications.
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82
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83 This manager uses the URLFetch service directly instead of using the
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84 emulated httplib, and is subject to URLFetch limitations as described in
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85 the App Engine documentation `here
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86 <https://cloud.google.com/appengine/docs/python/urlfetch>`_.
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87
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88 Notably it will raise an :class:`AppEnginePlatformError` if:
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89 * URLFetch is not available.
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90 * If you attempt to use this on App Engine Flexible, as full socket
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91 support is available.
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92 * If a request size is more than 10 megabytes.
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93 * If a response size is more than 32 megabtyes.
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94 * If you use an unsupported request method such as OPTIONS.
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95
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96 Beyond those cases, it will raise normal urllib3 errors.
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97 """
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98
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99 def __init__(
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100 self,
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101 headers=None,
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102 retries=None,
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103 validate_certificate=True,
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104 urlfetch_retries=True,
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105 ):
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106 if not urlfetch:
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107 raise AppEnginePlatformError(
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108 "URLFetch is not available in this environment."
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109 )
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110
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111 warnings.warn(
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112 "urllib3 is using URLFetch on Google App Engine sandbox instead "
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113 "of sockets. To use sockets directly instead of URLFetch see "
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114 "https://urllib3.readthedocs.io/en/latest/reference/urllib3.contrib.html.",
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115 AppEnginePlatformWarning,
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116 )
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117
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118 RequestMethods.__init__(self, headers)
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119 self.validate_certificate = validate_certificate
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120 self.urlfetch_retries = urlfetch_retries
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121
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122 self.retries = retries or Retry.DEFAULT
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123
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124 def __enter__(self):
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125 return self
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126
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127 def __exit__(self, exc_type, exc_val, exc_tb):
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128 # Return False to re-raise any potential exceptions
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129 return False
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130
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131 def urlopen(
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132 self,
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133 method,
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134 url,
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135 body=None,
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136 headers=None,
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137 retries=None,
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138 redirect=True,
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139 timeout=Timeout.DEFAULT_TIMEOUT,
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140 **response_kw
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141 ):
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142
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143 retries = self._get_retries(retries, redirect)
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144
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145 try:
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146 follow_redirects = redirect and retries.redirect != 0 and retries.total
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147 response = urlfetch.fetch(
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148 url,
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149 payload=body,
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150 method=method,
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151 headers=headers or {},
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152 allow_truncated=False,
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153 follow_redirects=self.urlfetch_retries and follow_redirects,
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154 deadline=self._get_absolute_timeout(timeout),
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155 validate_certificate=self.validate_certificate,
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156 )
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157 except urlfetch.DeadlineExceededError as e:
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158 raise TimeoutError(self, e)
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159
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160 except urlfetch.InvalidURLError as e:
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161 if "too large" in str(e):
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162 raise AppEnginePlatformError(
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163 "URLFetch request too large, URLFetch only "
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164 "supports requests up to 10mb in size.",
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165 e,
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166 )
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167 raise ProtocolError(e)
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168
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169 except urlfetch.DownloadError as e:
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170 if "Too many redirects" in str(e):
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171 raise MaxRetryError(self, url, reason=e)
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172 raise ProtocolError(e)
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173
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174 except urlfetch.ResponseTooLargeError as e:
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175 raise AppEnginePlatformError(
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176 "URLFetch response too large, URLFetch only supports"
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177 "responses up to 32mb in size.",
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178 e,
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179 )
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180
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181 except urlfetch.SSLCertificateError as e:
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182 raise SSLError(e)
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183
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184 except urlfetch.InvalidMethodError as e:
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185 raise AppEnginePlatformError(
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186 "URLFetch does not support method: %s" % method, e
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187 )
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188
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189 http_response = self._urlfetch_response_to_http_response(
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190 response, retries=retries, **response_kw
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191 )
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192
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193 # Handle redirect?
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194 redirect_location = redirect and http_response.get_redirect_location()
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195 if redirect_location:
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196 # Check for redirect response
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197 if self.urlfetch_retries and retries.raise_on_redirect:
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198 raise MaxRetryError(self, url, "too many redirects")
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199 else:
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200 if http_response.status == 303:
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201 method = "GET"
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202
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203 try:
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204 retries = retries.increment(
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205 method, url, response=http_response, _pool=self
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206 )
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207 except MaxRetryError:
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208 if retries.raise_on_redirect:
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209 raise MaxRetryError(self, url, "too many redirects")
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210 return http_response
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211
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212 retries.sleep_for_retry(http_response)
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213 log.debug("Redirecting %s -> %s", url, redirect_location)
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214 redirect_url = urljoin(url, redirect_location)
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215 return self.urlopen(
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216 method,
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217 redirect_url,
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218 body,
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219 headers,
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220 retries=retries,
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221 redirect=redirect,
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222 timeout=timeout,
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223 **response_kw
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224 )
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225
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226 # Check if we should retry the HTTP response.
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227 has_retry_after = bool(http_response.getheader("Retry-After"))
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228 if retries.is_retry(method, http_response.status, has_retry_after):
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229 retries = retries.increment(method, url, response=http_response, _pool=self)
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230 log.debug("Retry: %s", url)
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231 retries.sleep(http_response)
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232 return self.urlopen(
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233 method,
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234 url,
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235 body=body,
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236 headers=headers,
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237 retries=retries,
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238 redirect=redirect,
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239 timeout=timeout,
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240 **response_kw
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241 )
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242
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243 return http_response
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244
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245 def _urlfetch_response_to_http_response(self, urlfetch_resp, **response_kw):
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246
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247 if is_prod_appengine():
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248 # Production GAE handles deflate encoding automatically, but does
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249 # not remove the encoding header.
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250 content_encoding = urlfetch_resp.headers.get("content-encoding")
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251
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252 if content_encoding == "deflate":
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253 del urlfetch_resp.headers["content-encoding"]
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254
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255 transfer_encoding = urlfetch_resp.headers.get("transfer-encoding")
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256 # We have a full response's content,
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257 # so let's make sure we don't report ourselves as chunked data.
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258 if transfer_encoding == "chunked":
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259 encodings = transfer_encoding.split(",")
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260 encodings.remove("chunked")
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261 urlfetch_resp.headers["transfer-encoding"] = ",".join(encodings)
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262
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263 original_response = HTTPResponse(
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264 # In order for decoding to work, we must present the content as
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265 # a file-like object.
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266 body=io.BytesIO(urlfetch_resp.content),
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267 msg=urlfetch_resp.header_msg,
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268 headers=urlfetch_resp.headers,
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269 status=urlfetch_resp.status_code,
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270 **response_kw
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271 )
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272
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273 return HTTPResponse(
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274 body=io.BytesIO(urlfetch_resp.content),
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275 headers=urlfetch_resp.headers,
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276 status=urlfetch_resp.status_code,
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277 original_response=original_response,
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278 **response_kw
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279 )
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280
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281 def _get_absolute_timeout(self, timeout):
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282 if timeout is Timeout.DEFAULT_TIMEOUT:
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283 return None # Defer to URLFetch's default.
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284 if isinstance(timeout, Timeout):
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285 if timeout._read is not None or timeout._connect is not None:
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286 warnings.warn(
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287 "URLFetch does not support granular timeout settings, "
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288 "reverting to total or default URLFetch timeout.",
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289 AppEnginePlatformWarning,
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290 )
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291 return timeout.total
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292 return timeout
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293
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294 def _get_retries(self, retries, redirect):
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295 if not isinstance(retries, Retry):
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296 retries = Retry.from_int(retries, redirect=redirect, default=self.retries)
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297
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298 if retries.connect or retries.read or retries.redirect:
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299 warnings.warn(
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300 "URLFetch only supports total retries and does not "
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301 "recognize connect, read, or redirect retry parameters.",
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302 AppEnginePlatformWarning,
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303 )
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304
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305 return retries
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306
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307
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308 # Alias methods from _appengine_environ to maintain public API interface.
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309
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310 is_appengine = _appengine_environ.is_appengine
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311 is_appengine_sandbox = _appengine_environ.is_appengine_sandbox
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312 is_local_appengine = _appengine_environ.is_local_appengine
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313 is_prod_appengine = _appengine_environ.is_prod_appengine
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314 is_prod_appengine_mvms = _appengine_environ.is_prod_appengine_mvms