Mercurial > repos > shellac > sam_consensus_v3
annotate env/lib/python3.9/site-packages/urllib3/poolmanager.py @ 0:4f3585e2f14b draft default tip
"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
author | shellac |
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date | Mon, 22 Mar 2021 18:12:50 +0000 |
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1 from __future__ import absolute_import |
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2 |
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3 import collections |
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4 import functools |
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5 import logging |
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6 |
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7 from ._collections import RecentlyUsedContainer |
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8 from .connectionpool import HTTPConnectionPool, HTTPSConnectionPool, port_by_scheme |
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9 from .exceptions import ( |
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10 LocationValueError, |
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11 MaxRetryError, |
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12 ProxySchemeUnknown, |
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13 ProxySchemeUnsupported, |
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14 URLSchemeUnknown, |
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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.proxy import connection_requires_http_tunnel |
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20 from .util.retry import Retry |
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21 from .util.url import parse_url |
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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__proxy_config", # class |
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63 "key_socket_options", # list of (level (int), optname (int), value (int or str)) tuples |
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64 "key__socks_options", # dict |
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65 "key_assert_hostname", # bool or string |
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66 "key_assert_fingerprint", # str |
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67 "key_server_hostname", # str |
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68 ) |
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69 |
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70 #: The namedtuple class used to construct keys for the connection pool. |
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71 #: All custom key schemes should include the fields in this key at a minimum. |
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72 PoolKey = collections.namedtuple("PoolKey", _key_fields) |
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73 |
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74 _proxy_config_fields = ("ssl_context", "use_forwarding_for_https") |
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75 ProxyConfig = collections.namedtuple("ProxyConfig", _proxy_config_fields) |
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76 |
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77 |
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78 def _default_key_normalizer(key_class, request_context): |
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79 """ |
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80 Create a pool key out of a request context dictionary. |
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81 |
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82 According to RFC 3986, both the scheme and host are case-insensitive. |
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83 Therefore, this function normalizes both before constructing the pool |
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84 key for an HTTPS request. If you wish to change this behaviour, provide |
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85 alternate callables to ``key_fn_by_scheme``. |
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86 |
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87 :param key_class: |
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88 The class to use when constructing the key. This should be a namedtuple |
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89 with the ``scheme`` and ``host`` keys at a minimum. |
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90 :type key_class: namedtuple |
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91 :param request_context: |
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92 A dictionary-like object that contain the context for a request. |
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93 :type request_context: dict |
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94 |
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95 :return: A namedtuple that can be used as a connection pool key. |
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96 :rtype: PoolKey |
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97 """ |
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98 # Since we mutate the dictionary, make a copy first |
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99 context = request_context.copy() |
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100 context["scheme"] = context["scheme"].lower() |
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101 context["host"] = context["host"].lower() |
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102 |
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103 # These are both dictionaries and need to be transformed into frozensets |
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104 for key in ("headers", "_proxy_headers", "_socks_options"): |
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105 if key in context and context[key] is not None: |
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106 context[key] = frozenset(context[key].items()) |
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107 |
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108 # The socket_options key may be a list and needs to be transformed into a |
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109 # tuple. |
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110 socket_opts = context.get("socket_options") |
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111 if socket_opts is not None: |
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112 context["socket_options"] = tuple(socket_opts) |
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113 |
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114 # Map the kwargs to the names in the namedtuple - this is necessary since |
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115 # namedtuples can't have fields starting with '_'. |
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116 for key in list(context.keys()): |
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117 context["key_" + key] = context.pop(key) |
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118 |
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119 # Default to ``None`` for keys missing from the context |
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120 for field in key_class._fields: |
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121 if field not in context: |
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122 context[field] = None |
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123 |
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124 return key_class(**context) |
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125 |
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126 |
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127 #: A dictionary that maps a scheme to a callable that creates a pool key. |
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128 #: This can be used to alter the way pool keys are constructed, if desired. |
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129 #: Each PoolManager makes a copy of this dictionary so they can be configured |
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130 #: globally here, or individually on the instance. |
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131 key_fn_by_scheme = { |
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132 "http": functools.partial(_default_key_normalizer, PoolKey), |
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133 "https": functools.partial(_default_key_normalizer, PoolKey), |
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134 } |
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135 |
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136 pool_classes_by_scheme = {"http": HTTPConnectionPool, "https": HTTPSConnectionPool} |
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137 |
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138 |
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139 class PoolManager(RequestMethods): |
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140 """ |
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141 Allows for arbitrary requests while transparently keeping track of |
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142 necessary connection pools for you. |
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143 |
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144 :param num_pools: |
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145 Number of connection pools to cache before discarding the least |
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146 recently used pool. |
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147 |
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148 :param headers: |
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149 Headers to include with all requests, unless other headers are given |
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150 explicitly. |
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151 |
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152 :param \\**connection_pool_kw: |
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153 Additional parameters are used to create fresh |
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154 :class:`urllib3.connectionpool.ConnectionPool` instances. |
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155 |
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156 Example:: |
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157 |
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158 >>> manager = PoolManager(num_pools=2) |
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159 >>> r = manager.request('GET', 'http://google.com/') |
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160 >>> r = manager.request('GET', 'http://google.com/mail') |
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161 >>> r = manager.request('GET', 'http://yahoo.com/') |
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162 >>> len(manager.pools) |
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163 2 |
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164 |
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165 """ |
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166 |
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167 proxy = None |
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168 proxy_config = None |
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169 |
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170 def __init__(self, num_pools=10, headers=None, **connection_pool_kw): |
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171 RequestMethods.__init__(self, headers) |
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172 self.connection_pool_kw = connection_pool_kw |
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173 self.pools = RecentlyUsedContainer(num_pools, dispose_func=lambda p: p.close()) |
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174 |
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175 # Locally set the pool classes and keys so other PoolManagers can |
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176 # override them. |
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177 self.pool_classes_by_scheme = pool_classes_by_scheme |
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178 self.key_fn_by_scheme = key_fn_by_scheme.copy() |
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179 |
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180 def __enter__(self): |
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181 return self |
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182 |
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183 def __exit__(self, exc_type, exc_val, exc_tb): |
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184 self.clear() |
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185 # Return False to re-raise any potential exceptions |
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186 return False |
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187 |
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188 def _new_pool(self, scheme, host, port, request_context=None): |
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189 """ |
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190 Create a new :class:`urllib3.connectionpool.ConnectionPool` based on host, port, scheme, and |
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191 any additional pool keyword arguments. |
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192 |
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193 If ``request_context`` is provided, it is provided as keyword arguments |
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194 to the pool class used. This method is used to actually create the |
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195 connection pools handed out by :meth:`connection_from_url` and |
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196 companion methods. It is intended to be overridden for customization. |
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197 """ |
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198 pool_cls = self.pool_classes_by_scheme[scheme] |
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199 if request_context is None: |
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200 request_context = self.connection_pool_kw.copy() |
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201 |
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202 # Although the context has everything necessary to create the pool, |
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203 # this function has historically only used the scheme, host, and port |
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204 # in the positional args. When an API change is acceptable these can |
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205 # be removed. |
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206 for key in ("scheme", "host", "port"): |
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207 request_context.pop(key, None) |
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208 |
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209 if scheme == "http": |
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210 for kw in SSL_KEYWORDS: |
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211 request_context.pop(kw, None) |
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212 |
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213 return pool_cls(host, port, **request_context) |
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214 |
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215 def clear(self): |
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216 """ |
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217 Empty our store of pools and direct them all to close. |
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218 |
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219 This will not affect in-flight connections, but they will not be |
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220 re-used after completion. |
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221 """ |
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222 self.pools.clear() |
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223 |
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224 def connection_from_host(self, host, port=None, scheme="http", pool_kwargs=None): |
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225 """ |
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226 Get a :class:`urllib3.connectionpool.ConnectionPool` based on the host, port, and scheme. |
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227 |
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228 If ``port`` isn't given, it will be derived from the ``scheme`` using |
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229 ``urllib3.connectionpool.port_by_scheme``. If ``pool_kwargs`` is |
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230 provided, it is merged with the instance's ``connection_pool_kw`` |
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231 variable and used to create the new connection pool, if one is |
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232 needed. |
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233 """ |
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234 |
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235 if not host: |
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236 raise LocationValueError("No host specified.") |
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237 |
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238 request_context = self._merge_pool_kwargs(pool_kwargs) |
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239 request_context["scheme"] = scheme or "http" |
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240 if not port: |
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241 port = port_by_scheme.get(request_context["scheme"].lower(), 80) |
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242 request_context["port"] = port |
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243 request_context["host"] = host |
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244 |
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245 return self.connection_from_context(request_context) |
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246 |
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247 def connection_from_context(self, request_context): |
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248 """ |
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249 Get a :class:`urllib3.connectionpool.ConnectionPool` based on the request context. |
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250 |
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251 ``request_context`` must at least contain the ``scheme`` key and its |
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252 value must be a key in ``key_fn_by_scheme`` instance variable. |
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253 """ |
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254 scheme = request_context["scheme"].lower() |
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255 pool_key_constructor = self.key_fn_by_scheme.get(scheme) |
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256 if not pool_key_constructor: |
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257 raise URLSchemeUnknown(scheme) |
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258 pool_key = pool_key_constructor(request_context) |
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259 |
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260 return self.connection_from_pool_key(pool_key, request_context=request_context) |
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261 |
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262 def connection_from_pool_key(self, pool_key, request_context=None): |
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263 """ |
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264 Get a :class:`urllib3.connectionpool.ConnectionPool` based on the provided pool key. |
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265 |
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266 ``pool_key`` should be a namedtuple that only contains immutable |
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267 objects. At a minimum it must have the ``scheme``, ``host``, and |
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268 ``port`` fields. |
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269 """ |
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270 with self.pools.lock: |
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271 # If the scheme, host, or port doesn't match existing open |
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272 # connections, open a new ConnectionPool. |
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273 pool = self.pools.get(pool_key) |
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274 if pool: |
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275 return pool |
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276 |
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277 # Make a fresh ConnectionPool of the desired type |
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278 scheme = request_context["scheme"] |
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279 host = request_context["host"] |
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280 port = request_context["port"] |
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281 pool = self._new_pool(scheme, host, port, request_context=request_context) |
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282 self.pools[pool_key] = pool |
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283 |
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284 return pool |
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285 |
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286 def connection_from_url(self, url, pool_kwargs=None): |
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287 """ |
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288 Similar to :func:`urllib3.connectionpool.connection_from_url`. |
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289 |
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290 If ``pool_kwargs`` is not provided and a new pool needs to be |
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291 constructed, ``self.connection_pool_kw`` is used to initialize |
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292 the :class:`urllib3.connectionpool.ConnectionPool`. If ``pool_kwargs`` |
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293 is provided, it is used instead. Note that if a new pool does not |
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294 need to be created for the request, the provided ``pool_kwargs`` are |
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295 not used. |
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296 """ |
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297 u = parse_url(url) |
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298 return self.connection_from_host( |
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299 u.host, port=u.port, scheme=u.scheme, pool_kwargs=pool_kwargs |
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300 ) |
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301 |
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302 def _merge_pool_kwargs(self, override): |
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303 """ |
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304 Merge a dictionary of override values for self.connection_pool_kw. |
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305 |
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306 This does not modify self.connection_pool_kw and returns a new dict. |
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307 Any keys in the override dictionary with a value of ``None`` are |
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308 removed from the merged dictionary. |
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309 """ |
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310 base_pool_kwargs = self.connection_pool_kw.copy() |
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311 if override: |
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312 for key, value in override.items(): |
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313 if value is None: |
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314 try: |
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315 del base_pool_kwargs[key] |
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316 except KeyError: |
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317 pass |
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318 else: |
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319 base_pool_kwargs[key] = value |
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320 return base_pool_kwargs |
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321 |
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322 def _proxy_requires_url_absolute_form(self, parsed_url): |
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323 """ |
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324 Indicates if the proxy requires the complete destination URL in the |
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325 request. Normally this is only needed when not using an HTTP CONNECT |
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326 tunnel. |
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327 """ |
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328 if self.proxy is None: |
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329 return False |
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330 |
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331 return not connection_requires_http_tunnel( |
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332 self.proxy, self.proxy_config, parsed_url.scheme |
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333 ) |
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334 |
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335 def _validate_proxy_scheme_url_selection(self, url_scheme): |
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336 """ |
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337 Validates that were not attempting to do TLS in TLS connections on |
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338 Python2 or with unsupported SSL implementations. |
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339 """ |
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340 if self.proxy is None or url_scheme != "https": |
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341 return |
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342 |
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343 if self.proxy.scheme != "https": |
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344 return |
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345 |
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346 if six.PY2 and not self.proxy_config.use_forwarding_for_https: |
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347 raise ProxySchemeUnsupported( |
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348 "Contacting HTTPS destinations through HTTPS proxies " |
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349 "'via CONNECT tunnels' is not supported in Python 2" |
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350 ) |
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351 |
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352 def urlopen(self, method, url, redirect=True, **kw): |
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353 """ |
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354 Same as :meth:`urllib3.HTTPConnectionPool.urlopen` |
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355 with custom cross-host redirect logic and only sends the request-uri |
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356 portion of the ``url``. |
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357 |
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358 The given ``url`` parameter must be absolute, such that an appropriate |
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359 :class:`urllib3.connectionpool.ConnectionPool` can be chosen for it. |
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360 """ |
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361 u = parse_url(url) |
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362 self._validate_proxy_scheme_url_selection(u.scheme) |
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363 |
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364 conn = self.connection_from_host(u.host, port=u.port, scheme=u.scheme) |
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365 |
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366 kw["assert_same_host"] = False |
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367 kw["redirect"] = False |
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368 |
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369 if "headers" not in kw: |
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370 kw["headers"] = self.headers.copy() |
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371 |
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372 if self._proxy_requires_url_absolute_form(u): |
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373 response = conn.urlopen(method, url, **kw) |
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374 else: |
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375 response = conn.urlopen(method, u.request_uri, **kw) |
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376 |
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377 redirect_location = redirect and response.get_redirect_location() |
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378 if not redirect_location: |
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379 return response |
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380 |
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381 # Support relative URLs for redirecting. |
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382 redirect_location = urljoin(url, redirect_location) |
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383 |
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384 # RFC 7231, Section 6.4.4 |
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385 if response.status == 303: |
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386 method = "GET" |
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387 |
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388 retries = kw.get("retries") |
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389 if not isinstance(retries, Retry): |
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390 retries = Retry.from_int(retries, redirect=redirect) |
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391 |
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392 # Strip headers marked as unsafe to forward to the redirected location. |
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393 # Check remove_headers_on_redirect to avoid a potential network call within |
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394 # conn.is_same_host() which may use socket.gethostbyname() in the future. |
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395 if retries.remove_headers_on_redirect and not conn.is_same_host( |
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396 redirect_location |
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397 ): |
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398 headers = list(six.iterkeys(kw["headers"])) |
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399 for header in headers: |
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400 if header.lower() in retries.remove_headers_on_redirect: |
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401 kw["headers"].pop(header, None) |
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402 |
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403 try: |
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404 retries = retries.increment(method, url, response=response, _pool=conn) |
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405 except MaxRetryError: |
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406 if retries.raise_on_redirect: |
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407 response.drain_conn() |
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408 raise |
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409 return response |
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410 |
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411 kw["retries"] = retries |
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412 kw["redirect"] = redirect |
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413 |
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414 log.info("Redirecting %s -> %s", url, redirect_location) |
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415 |
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416 response.drain_conn() |
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417 return self.urlopen(method, redirect_location, **kw) |
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418 |
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419 |
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420 class ProxyManager(PoolManager): |
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421 """ |
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422 Behaves just like :class:`PoolManager`, but sends all requests through |
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423 the defined proxy, using the CONNECT method for HTTPS URLs. |
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424 |
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425 :param proxy_url: |
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426 The URL of the proxy to be used. |
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427 |
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428 :param proxy_headers: |
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429 A dictionary containing headers that will be sent to the proxy. In case |
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430 of HTTP they are being sent with each request, while in the |
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431 HTTPS/CONNECT case they are sent only once. Could be used for proxy |
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432 authentication. |
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433 |
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434 :param proxy_ssl_context: |
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435 The proxy SSL context is used to establish the TLS connection to the |
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436 proxy when using HTTPS proxies. |
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437 |
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438 :param use_forwarding_for_https: |
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439 (Defaults to False) If set to True will forward requests to the HTTPS |
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440 proxy to be made on behalf of the client instead of creating a TLS |
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441 tunnel via the CONNECT method. **Enabling this flag means that request |
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442 and response headers and content will be visible from the HTTPS proxy** |
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443 whereas tunneling keeps request and response headers and content |
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444 private. IP address, target hostname, SNI, and port are always visible |
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445 to an HTTPS proxy even when this flag is disabled. |
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446 |
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447 Example: |
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448 >>> proxy = urllib3.ProxyManager('http://localhost:3128/') |
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449 >>> r1 = proxy.request('GET', 'http://google.com/') |
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450 >>> r2 = proxy.request('GET', 'http://httpbin.org/') |
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451 >>> len(proxy.pools) |
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452 1 |
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453 >>> r3 = proxy.request('GET', 'https://httpbin.org/') |
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454 >>> r4 = proxy.request('GET', 'https://twitter.com/') |
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455 >>> len(proxy.pools) |
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456 3 |
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457 |
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458 """ |
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459 |
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460 def __init__( |
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461 self, |
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462 proxy_url, |
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463 num_pools=10, |
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464 headers=None, |
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465 proxy_headers=None, |
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466 proxy_ssl_context=None, |
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467 use_forwarding_for_https=False, |
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468 **connection_pool_kw |
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469 ): |
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470 |
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471 if isinstance(proxy_url, HTTPConnectionPool): |
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472 proxy_url = "%s://%s:%i" % ( |
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473 proxy_url.scheme, |
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474 proxy_url.host, |
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475 proxy_url.port, |
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476 ) |
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477 proxy = parse_url(proxy_url) |
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478 |
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479 if proxy.scheme not in ("http", "https"): |
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480 raise ProxySchemeUnknown(proxy.scheme) |
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481 |
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482 if not proxy.port: |
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483 port = port_by_scheme.get(proxy.scheme, 80) |
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484 proxy = proxy._replace(port=port) |
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485 |
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486 self.proxy = proxy |
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487 self.proxy_headers = proxy_headers or {} |
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488 self.proxy_ssl_context = proxy_ssl_context |
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489 self.proxy_config = ProxyConfig(proxy_ssl_context, use_forwarding_for_https) |
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490 |
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491 connection_pool_kw["_proxy"] = self.proxy |
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492 connection_pool_kw["_proxy_headers"] = self.proxy_headers |
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493 connection_pool_kw["_proxy_config"] = self.proxy_config |
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494 |
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495 super(ProxyManager, self).__init__(num_pools, headers, **connection_pool_kw) |
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496 |
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497 def connection_from_host(self, host, port=None, scheme="http", pool_kwargs=None): |
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498 if scheme == "https": |
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499 return super(ProxyManager, self).connection_from_host( |
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500 host, port, scheme, pool_kwargs=pool_kwargs |
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501 ) |
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502 |
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503 return super(ProxyManager, self).connection_from_host( |
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504 self.proxy.host, self.proxy.port, self.proxy.scheme, pool_kwargs=pool_kwargs |
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505 ) |
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506 |
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507 def _set_proxy_headers(self, url, headers=None): |
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508 """ |
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509 Sets headers needed by proxies: specifically, the Accept and Host |
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510 headers. Only sets headers not provided by the user. |
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511 """ |
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512 headers_ = {"Accept": "*/*"} |
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513 |
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514 netloc = parse_url(url).netloc |
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515 if netloc: |
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516 headers_["Host"] = netloc |
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517 |
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518 if headers: |
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519 headers_.update(headers) |
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520 return headers_ |
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521 |
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522 def urlopen(self, method, url, redirect=True, **kw): |
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523 "Same as HTTP(S)ConnectionPool.urlopen, ``url`` must be absolute." |
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524 u = parse_url(url) |
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525 if not connection_requires_http_tunnel(self.proxy, self.proxy_config, u.scheme): |
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526 # For connections using HTTP CONNECT, httplib sets the necessary |
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527 # headers on the CONNECT to the proxy. If we're not using CONNECT, |
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528 # we'll definitely need to set 'Host' at the very least. |
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529 headers = kw.get("headers", self.headers) |
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530 kw["headers"] = self._set_proxy_headers(url, headers) |
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531 |
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532 return super(ProxyManager, self).urlopen(method, url, redirect=redirect, **kw) |
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533 |
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534 |
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535 def proxy_from_url(url, **kw): |
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536 return ProxyManager(proxy_url=url, **kw) |