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annotate planemo/lib/python3.7/site-packages/urllib3/poolmanager.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 collections
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3 import functools
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4 import logging
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5 import warnings
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6
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7 from ._collections import RecentlyUsedContainer
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8 from .connectionpool import HTTPConnectionPool, HTTPSConnectionPool
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9 from .connectionpool import port_by_scheme
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10 from .exceptions import (
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11 LocationValueError,
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12 MaxRetryError,
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13 ProxySchemeUnknown,
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14 InvalidProxyConfigurationWarning,
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15 )
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16 from .packages import six
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17 from .packages.six.moves.urllib.parse import urljoin
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18 from .request import RequestMethods
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19 from .util.url import parse_url
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20 from .util.retry import Retry
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21
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22
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23 __all__ = ["PoolManager", "ProxyManager", "proxy_from_url"]
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24
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25
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26 log = logging.getLogger(__name__)
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27
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28 SSL_KEYWORDS = (
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29 "key_file",
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30 "cert_file",
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31 "cert_reqs",
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32 "ca_certs",
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33 "ssl_version",
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34 "ca_cert_dir",
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35 "ssl_context",
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36 "key_password",
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37 )
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38
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39 # All known keyword arguments that could be provided to the pool manager, its
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40 # pools, or the underlying connections. This is used to construct a pool key.
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41 _key_fields = (
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42 "key_scheme", # str
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43 "key_host", # str
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44 "key_port", # int
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45 "key_timeout", # int or float or Timeout
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46 "key_retries", # int or Retry
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47 "key_strict", # bool
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48 "key_block", # bool
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49 "key_source_address", # str
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50 "key_key_file", # str
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51 "key_key_password", # str
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52 "key_cert_file", # str
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53 "key_cert_reqs", # str
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54 "key_ca_certs", # str
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55 "key_ssl_version", # str
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56 "key_ca_cert_dir", # str
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57 "key_ssl_context", # instance of ssl.SSLContext or urllib3.util.ssl_.SSLContext
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58 "key_maxsize", # int
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59 "key_headers", # dict
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60 "key__proxy", # parsed proxy url
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61 "key__proxy_headers", # dict
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62 "key_socket_options", # list of (level (int), optname (int), value (int or str)) tuples
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63 "key__socks_options", # dict
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64 "key_assert_hostname", # bool or string
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65 "key_assert_fingerprint", # str
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66 "key_server_hostname", # str
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67 )
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68
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69 #: The namedtuple class used to construct keys for the connection pool.
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70 #: All custom key schemes should include the fields in this key at a minimum.
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71 PoolKey = collections.namedtuple("PoolKey", _key_fields)
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72
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73
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74 def _default_key_normalizer(key_class, request_context):
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75 """
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76 Create a pool key out of a request context dictionary.
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77
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78 According to RFC 3986, both the scheme and host are case-insensitive.
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79 Therefore, this function normalizes both before constructing the pool
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80 key for an HTTPS request. If you wish to change this behaviour, provide
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81 alternate callables to ``key_fn_by_scheme``.
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82
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83 :param key_class:
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84 The class to use when constructing the key. This should be a namedtuple
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85 with the ``scheme`` and ``host`` keys at a minimum.
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86 :type key_class: namedtuple
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87 :param request_context:
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88 A dictionary-like object that contain the context for a request.
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89 :type request_context: dict
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90
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91 :return: A namedtuple that can be used as a connection pool key.
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92 :rtype: PoolKey
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93 """
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94 # Since we mutate the dictionary, make a copy first
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95 context = request_context.copy()
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96 context["scheme"] = context["scheme"].lower()
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97 context["host"] = context["host"].lower()
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98
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99 # These are both dictionaries and need to be transformed into frozensets
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100 for key in ("headers", "_proxy_headers", "_socks_options"):
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101 if key in context and context[key] is not None:
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102 context[key] = frozenset(context[key].items())
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103
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104 # The socket_options key may be a list and needs to be transformed into a
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105 # tuple.
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106 socket_opts = context.get("socket_options")
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107 if socket_opts is not None:
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108 context["socket_options"] = tuple(socket_opts)
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109
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110 # Map the kwargs to the names in the namedtuple - this is necessary since
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111 # namedtuples can't have fields starting with '_'.
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112 for key in list(context.keys()):
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113 context["key_" + key] = context.pop(key)
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114
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115 # Default to ``None`` for keys missing from the context
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116 for field in key_class._fields:
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117 if field not in context:
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118 context[field] = None
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119
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120 return key_class(**context)
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121
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122
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123 #: A dictionary that maps a scheme to a callable that creates a pool key.
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124 #: This can be used to alter the way pool keys are constructed, if desired.
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125 #: Each PoolManager makes a copy of this dictionary so they can be configured
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126 #: globally here, or individually on the instance.
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127 key_fn_by_scheme = {
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128 "http": functools.partial(_default_key_normalizer, PoolKey),
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129 "https": functools.partial(_default_key_normalizer, PoolKey),
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130 }
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131
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132 pool_classes_by_scheme = {"http": HTTPConnectionPool, "https": HTTPSConnectionPool}
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133
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134
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135 class PoolManager(RequestMethods):
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136 """
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137 Allows for arbitrary requests while transparently keeping track of
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138 necessary connection pools for you.
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139
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140 :param num_pools:
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141 Number of connection pools to cache before discarding the least
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142 recently used pool.
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143
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144 :param headers:
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145 Headers to include with all requests, unless other headers are given
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146 explicitly.
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147
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148 :param \\**connection_pool_kw:
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149 Additional parameters are used to create fresh
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150 :class:`urllib3.connectionpool.ConnectionPool` instances.
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151
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152 Example::
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153
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154 >>> manager = PoolManager(num_pools=2)
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155 >>> r = manager.request('GET', 'http://google.com/')
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156 >>> r = manager.request('GET', 'http://google.com/mail')
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157 >>> r = manager.request('GET', 'http://yahoo.com/')
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158 >>> len(manager.pools)
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159 2
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160
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161 """
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162
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163 proxy = None
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164
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165 def __init__(self, num_pools=10, headers=None, **connection_pool_kw):
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166 RequestMethods.__init__(self, headers)
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167 self.connection_pool_kw = connection_pool_kw
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168 self.pools = RecentlyUsedContainer(num_pools, dispose_func=lambda p: p.close())
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169
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170 # Locally set the pool classes and keys so other PoolManagers can
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171 # override them.
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172 self.pool_classes_by_scheme = pool_classes_by_scheme
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173 self.key_fn_by_scheme = key_fn_by_scheme.copy()
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174
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175 def __enter__(self):
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176 return self
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177
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178 def __exit__(self, exc_type, exc_val, exc_tb):
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179 self.clear()
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180 # Return False to re-raise any potential exceptions
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181 return False
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182
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183 def _new_pool(self, scheme, host, port, request_context=None):
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184 """
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185 Create a new :class:`ConnectionPool` based on host, port, scheme, and
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186 any additional pool keyword arguments.
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187
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188 If ``request_context`` is provided, it is provided as keyword arguments
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189 to the pool class used. This method is used to actually create the
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190 connection pools handed out by :meth:`connection_from_url` and
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191 companion methods. It is intended to be overridden for customization.
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192 """
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193 pool_cls = self.pool_classes_by_scheme[scheme]
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194 if request_context is None:
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195 request_context = self.connection_pool_kw.copy()
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196
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197 # Although the context has everything necessary to create the pool,
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198 # this function has historically only used the scheme, host, and port
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199 # in the positional args. When an API change is acceptable these can
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200 # be removed.
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201 for key in ("scheme", "host", "port"):
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202 request_context.pop(key, None)
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203
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204 if scheme == "http":
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205 for kw in SSL_KEYWORDS:
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206 request_context.pop(kw, None)
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207
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208 return pool_cls(host, port, **request_context)
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209
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210 def clear(self):
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211 """
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212 Empty our store of pools and direct them all to close.
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213
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214 This will not affect in-flight connections, but they will not be
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215 re-used after completion.
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216 """
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217 self.pools.clear()
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218
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219 def connection_from_host(self, host, port=None, scheme="http", pool_kwargs=None):
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220 """
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221 Get a :class:`ConnectionPool` based on the host, port, and scheme.
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222
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223 If ``port`` isn't given, it will be derived from the ``scheme`` using
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224 ``urllib3.connectionpool.port_by_scheme``. If ``pool_kwargs`` is
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225 provided, it is merged with the instance's ``connection_pool_kw``
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226 variable and used to create the new connection pool, if one is
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227 needed.
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228 """
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229
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230 if not host:
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231 raise LocationValueError("No host specified.")
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232
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233 request_context = self._merge_pool_kwargs(pool_kwargs)
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234 request_context["scheme"] = scheme or "http"
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235 if not port:
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236 port = port_by_scheme.get(request_context["scheme"].lower(), 80)
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237 request_context["port"] = port
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238 request_context["host"] = host
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239
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240 return self.connection_from_context(request_context)
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241
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242 def connection_from_context(self, request_context):
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243 """
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244 Get a :class:`ConnectionPool` based on the request context.
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245
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246 ``request_context`` must at least contain the ``scheme`` key and its
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247 value must be a key in ``key_fn_by_scheme`` instance variable.
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248 """
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249 scheme = request_context["scheme"].lower()
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250 pool_key_constructor = self.key_fn_by_scheme[scheme]
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251 pool_key = pool_key_constructor(request_context)
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252
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253 return self.connection_from_pool_key(pool_key, request_context=request_context)
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254
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255 def connection_from_pool_key(self, pool_key, request_context=None):
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256 """
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257 Get a :class:`ConnectionPool` based on the provided pool key.
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258
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259 ``pool_key`` should be a namedtuple that only contains immutable
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260 objects. At a minimum it must have the ``scheme``, ``host``, and
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261 ``port`` fields.
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262 """
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263 with self.pools.lock:
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264 # If the scheme, host, or port doesn't match existing open
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265 # connections, open a new ConnectionPool.
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266 pool = self.pools.get(pool_key)
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267 if pool:
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268 return pool
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269
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270 # Make a fresh ConnectionPool of the desired type
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271 scheme = request_context["scheme"]
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272 host = request_context["host"]
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273 port = request_context["port"]
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274 pool = self._new_pool(scheme, host, port, request_context=request_context)
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275 self.pools[pool_key] = pool
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276
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277 return pool
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278
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279 def connection_from_url(self, url, pool_kwargs=None):
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280 """
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281 Similar to :func:`urllib3.connectionpool.connection_from_url`.
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282
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283 If ``pool_kwargs`` is not provided and a new pool needs to be
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284 constructed, ``self.connection_pool_kw`` is used to initialize
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285 the :class:`urllib3.connectionpool.ConnectionPool`. If ``pool_kwargs``
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286 is provided, it is used instead. Note that if a new pool does not
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287 need to be created for the request, the provided ``pool_kwargs`` are
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288 not used.
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289 """
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290 u = parse_url(url)
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291 return self.connection_from_host(
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292 u.host, port=u.port, scheme=u.scheme, pool_kwargs=pool_kwargs
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293 )
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294
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295 def _merge_pool_kwargs(self, override):
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296 """
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297 Merge a dictionary of override values for self.connection_pool_kw.
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298
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299 This does not modify self.connection_pool_kw and returns a new dict.
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300 Any keys in the override dictionary with a value of ``None`` are
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301 removed from the merged dictionary.
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302 """
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303 base_pool_kwargs = self.connection_pool_kw.copy()
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304 if override:
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305 for key, value in override.items():
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306 if value is None:
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307 try:
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308 del base_pool_kwargs[key]
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309 except KeyError:
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310 pass
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311 else:
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312 base_pool_kwargs[key] = value
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313 return base_pool_kwargs
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314
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315 def urlopen(self, method, url, redirect=True, **kw):
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316 """
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317 Same as :meth:`urllib3.connectionpool.HTTPConnectionPool.urlopen`
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318 with custom cross-host redirect logic and only sends the request-uri
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319 portion of the ``url``.
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320
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321 The given ``url`` parameter must be absolute, such that an appropriate
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322 :class:`urllib3.connectionpool.ConnectionPool` can be chosen for it.
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323 """
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324 u = parse_url(url)
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325 conn = self.connection_from_host(u.host, port=u.port, scheme=u.scheme)
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326
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327 kw["assert_same_host"] = False
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328 kw["redirect"] = False
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329
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330 if "headers" not in kw:
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331 kw["headers"] = self.headers.copy()
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332
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333 if self.proxy is not None and u.scheme == "http":
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334 response = conn.urlopen(method, url, **kw)
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335 else:
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336 response = conn.urlopen(method, u.request_uri, **kw)
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337
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338 redirect_location = redirect and response.get_redirect_location()
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339 if not redirect_location:
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340 return response
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341
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342 # Support relative URLs for redirecting.
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343 redirect_location = urljoin(url, redirect_location)
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344
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345 # RFC 7231, Section 6.4.4
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346 if response.status == 303:
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347 method = "GET"
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348
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349 retries = kw.get("retries")
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350 if not isinstance(retries, Retry):
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351 retries = Retry.from_int(retries, redirect=redirect)
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352
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353 # Strip headers marked as unsafe to forward to the redirected location.
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354 # Check remove_headers_on_redirect to avoid a potential network call within
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355 # conn.is_same_host() which may use socket.gethostbyname() in the future.
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356 if retries.remove_headers_on_redirect and not conn.is_same_host(
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357 redirect_location
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358 ):
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359 headers = list(six.iterkeys(kw["headers"]))
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360 for header in headers:
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361 if header.lower() in retries.remove_headers_on_redirect:
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362 kw["headers"].pop(header, None)
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363
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364 try:
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365 retries = retries.increment(method, url, response=response, _pool=conn)
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366 except MaxRetryError:
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367 if retries.raise_on_redirect:
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368 response.drain_conn()
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369 raise
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370 return response
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371
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372 kw["retries"] = retries
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373 kw["redirect"] = redirect
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374
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375 log.info("Redirecting %s -> %s", url, redirect_location)
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376
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377 response.drain_conn()
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378 return self.urlopen(method, redirect_location, **kw)
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379
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380
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381 class ProxyManager(PoolManager):
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382 """
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383 Behaves just like :class:`PoolManager`, but sends all requests through
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384 the defined proxy, using the CONNECT method for HTTPS URLs.
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385
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386 :param proxy_url:
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387 The URL of the proxy to be used.
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388
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389 :param proxy_headers:
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390 A dictionary containing headers that will be sent to the proxy. In case
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391 of HTTP they are being sent with each request, while in the
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392 HTTPS/CONNECT case they are sent only once. Could be used for proxy
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393 authentication.
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394
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395 Example:
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396 >>> proxy = urllib3.ProxyManager('http://localhost:3128/')
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397 >>> r1 = proxy.request('GET', 'http://google.com/')
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398 >>> r2 = proxy.request('GET', 'http://httpbin.org/')
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399 >>> len(proxy.pools)
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400 1
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401 >>> r3 = proxy.request('GET', 'https://httpbin.org/')
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402 >>> r4 = proxy.request('GET', 'https://twitter.com/')
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403 >>> len(proxy.pools)
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404 3
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405
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406 """
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407
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408 def __init__(
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409 self,
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410 proxy_url,
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411 num_pools=10,
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412 headers=None,
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413 proxy_headers=None,
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414 **connection_pool_kw
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415 ):
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416
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417 if isinstance(proxy_url, HTTPConnectionPool):
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418 proxy_url = "%s://%s:%i" % (
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419 proxy_url.scheme,
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420 proxy_url.host,
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421 proxy_url.port,
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422 )
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423 proxy = parse_url(proxy_url)
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424 if not proxy.port:
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425 port = port_by_scheme.get(proxy.scheme, 80)
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426 proxy = proxy._replace(port=port)
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427
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428 if proxy.scheme not in ("http", "https"):
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429 raise ProxySchemeUnknown(proxy.scheme)
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430
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431 self.proxy = proxy
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432 self.proxy_headers = proxy_headers or {}
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433
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434 connection_pool_kw["_proxy"] = self.proxy
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435 connection_pool_kw["_proxy_headers"] = self.proxy_headers
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436
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437 super(ProxyManager, self).__init__(num_pools, headers, **connection_pool_kw)
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438
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439 def connection_from_host(self, host, port=None, scheme="http", pool_kwargs=None):
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440 if scheme == "https":
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441 return super(ProxyManager, self).connection_from_host(
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442 host, port, scheme, pool_kwargs=pool_kwargs
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443 )
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444
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445 return super(ProxyManager, self).connection_from_host(
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446 self.proxy.host, self.proxy.port, self.proxy.scheme, pool_kwargs=pool_kwargs
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447 )
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448
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449 def _set_proxy_headers(self, url, headers=None):
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450 """
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451 Sets headers needed by proxies: specifically, the Accept and Host
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452 headers. Only sets headers not provided by the user.
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453 """
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454 headers_ = {"Accept": "*/*"}
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455
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456 netloc = parse_url(url).netloc
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457 if netloc:
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458 headers_["Host"] = netloc
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459
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460 if headers:
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461 headers_.update(headers)
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462 return headers_
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463
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464 def _validate_proxy_scheme_url_selection(self, url_scheme):
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465 if url_scheme == "https" and self.proxy.scheme == "https":
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466 warnings.warn(
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467 "Your proxy configuration specified an HTTPS scheme for the proxy. "
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468 "Are you sure you want to use HTTPS to contact the proxy? "
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469 "This most likely indicates an error in your configuration. "
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470 "Read this issue for more info: "
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471 "https://github.com/urllib3/urllib3/issues/1850",
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472 InvalidProxyConfigurationWarning,
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473 stacklevel=3,
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474 )
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475
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476 def urlopen(self, method, url, redirect=True, **kw):
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477 "Same as HTTP(S)ConnectionPool.urlopen, ``url`` must be absolute."
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478 u = parse_url(url)
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479 self._validate_proxy_scheme_url_selection(u.scheme)
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480
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481 if u.scheme == "http":
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482 # For proxied HTTPS requests, httplib sets the necessary headers
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483 # on the CONNECT to the proxy. For HTTP, we'll definitely
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484 # need to set 'Host' at the very least.
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485 headers = kw.get("headers", self.headers)
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486 kw["headers"] = self._set_proxy_headers(url, headers)
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487
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488 return super(ProxyManager, self).urlopen(method, url, redirect=redirect, **kw)
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489
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490
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491 def proxy_from_url(url, **kw):
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492 return ProxyManager(proxy_url=url, **kw)