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annotate venv/lib/python2.7/site-packages/requests/packages/urllib3/connectionpool.py @ 0:d67268158946 draft

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planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
author bcclaywell
date Mon, 12 Oct 2015 17:43:33 -0400
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1 import errno
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2 import logging
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3 import sys
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4 import warnings
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5
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6 from socket import error as SocketError, timeout as SocketTimeout
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7 import socket
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8
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9 try: # Python 3
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10 from queue import LifoQueue, Empty, Full
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11 except ImportError:
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12 from Queue import LifoQueue, Empty, Full
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13 import Queue as _ # Platform-specific: Windows
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14
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15
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16 from .exceptions import (
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17 ClosedPoolError,
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18 ProtocolError,
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19 EmptyPoolError,
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20 HeaderParsingError,
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21 HostChangedError,
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22 LocationValueError,
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23 MaxRetryError,
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24 ProxyError,
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25 ConnectTimeoutError,
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26 ReadTimeoutError,
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27 SSLError,
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28 TimeoutError,
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29 InsecureRequestWarning,
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30 NewConnectionError,
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31 )
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32 from .packages.ssl_match_hostname import CertificateError
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33 from .packages import six
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34 from .connection import (
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35 port_by_scheme,
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36 DummyConnection,
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37 HTTPConnection, HTTPSConnection, VerifiedHTTPSConnection,
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38 HTTPException, BaseSSLError, ConnectionError
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39 )
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40 from .request import RequestMethods
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41 from .response import HTTPResponse
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42
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43 from .util.connection import is_connection_dropped
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44 from .util.response import assert_header_parsing
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45 from .util.retry import Retry
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46 from .util.timeout import Timeout
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47 from .util.url import get_host, Url
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48
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49
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50 xrange = six.moves.xrange
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51
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52 log = logging.getLogger(__name__)
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53
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54 _Default = object()
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55
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56
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57 ## Pool objects
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58 class ConnectionPool(object):
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59 """
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60 Base class for all connection pools, such as
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61 :class:`.HTTPConnectionPool` and :class:`.HTTPSConnectionPool`.
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62 """
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63
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64 scheme = None
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65 QueueCls = LifoQueue
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66
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67 def __init__(self, host, port=None):
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68 if not host:
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69 raise LocationValueError("No host specified.")
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70
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71 # httplib doesn't like it when we include brackets in ipv6 addresses
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72 self.host = host.strip('[]')
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73 self.port = port
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74
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75 def __str__(self):
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76 return '%s(host=%r, port=%r)' % (type(self).__name__,
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77 self.host, self.port)
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78
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79 def __enter__(self):
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80 return self
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81
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82 def __exit__(self, exc_type, exc_val, exc_tb):
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83 self.close()
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84 # Return False to re-raise any potential exceptions
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85 return False
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86
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87 def close():
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88 """
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89 Close all pooled connections and disable the pool.
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90 """
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91 pass
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92
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93
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94 # This is taken from http://hg.python.org/cpython/file/7aaba721ebc0/Lib/socket.py#l252
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95 _blocking_errnos = set([errno.EAGAIN, errno.EWOULDBLOCK])
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96
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97
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98 class HTTPConnectionPool(ConnectionPool, RequestMethods):
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99 """
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100 Thread-safe connection pool for one host.
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101
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102 :param host:
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103 Host used for this HTTP Connection (e.g. "localhost"), passed into
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104 :class:`httplib.HTTPConnection`.
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105
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106 :param port:
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107 Port used for this HTTP Connection (None is equivalent to 80), passed
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108 into :class:`httplib.HTTPConnection`.
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109
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110 :param strict:
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111 Causes BadStatusLine to be raised if the status line can't be parsed
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112 as a valid HTTP/1.0 or 1.1 status line, passed into
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113 :class:`httplib.HTTPConnection`.
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114
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115 .. note::
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116 Only works in Python 2. This parameter is ignored in Python 3.
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117
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118 :param timeout:
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119 Socket timeout in seconds for each individual connection. This can
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120 be a float or integer, which sets the timeout for the HTTP request,
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121 or an instance of :class:`urllib3.util.Timeout` which gives you more
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122 fine-grained control over request timeouts. After the constructor has
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123 been parsed, this is always a `urllib3.util.Timeout` object.
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124
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125 :param maxsize:
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126 Number of connections to save that can be reused. More than 1 is useful
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127 in multithreaded situations. If ``block`` is set to False, more
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128 connections will be created but they will not be saved once they've
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129 been used.
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130
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131 :param block:
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132 If set to True, no more than ``maxsize`` connections will be used at
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133 a time. When no free connections are available, the call will block
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134 until a connection has been released. This is a useful side effect for
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135 particular multithreaded situations where one does not want to use more
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136 than maxsize connections per host to prevent flooding.
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137
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138 :param headers:
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139 Headers to include with all requests, unless other headers are given
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140 explicitly.
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141
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142 :param retries:
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143 Retry configuration to use by default with requests in this pool.
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144
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145 :param _proxy:
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146 Parsed proxy URL, should not be used directly, instead, see
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147 :class:`urllib3.connectionpool.ProxyManager`"
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148
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149 :param _proxy_headers:
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150 A dictionary with proxy headers, should not be used directly,
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151 instead, see :class:`urllib3.connectionpool.ProxyManager`"
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152
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153 :param \**conn_kw:
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154 Additional parameters are used to create fresh :class:`urllib3.connection.HTTPConnection`,
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155 :class:`urllib3.connection.HTTPSConnection` instances.
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156 """
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157
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158 scheme = 'http'
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159 ConnectionCls = HTTPConnection
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160
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161 def __init__(self, host, port=None, strict=False,
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162 timeout=Timeout.DEFAULT_TIMEOUT, maxsize=1, block=False,
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163 headers=None, retries=None,
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164 _proxy=None, _proxy_headers=None,
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165 **conn_kw):
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166 ConnectionPool.__init__(self, host, port)
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167 RequestMethods.__init__(self, headers)
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168
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169 self.strict = strict
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170
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171 if not isinstance(timeout, Timeout):
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172 timeout = Timeout.from_float(timeout)
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173
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174 if retries is None:
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175 retries = Retry.DEFAULT
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176
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177 self.timeout = timeout
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178 self.retries = retries
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179
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180 self.pool = self.QueueCls(maxsize)
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181 self.block = block
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182
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183 self.proxy = _proxy
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184 self.proxy_headers = _proxy_headers or {}
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185
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186 # Fill the queue up so that doing get() on it will block properly
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187 for _ in xrange(maxsize):
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188 self.pool.put(None)
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189
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190 # These are mostly for testing and debugging purposes.
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191 self.num_connections = 0
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192 self.num_requests = 0
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193 self.conn_kw = conn_kw
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194
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195 if self.proxy:
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196 # Enable Nagle's algorithm for proxies, to avoid packet fragmentation.
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197 # We cannot know if the user has added default socket options, so we cannot replace the
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198 # list.
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199 self.conn_kw.setdefault('socket_options', [])
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200
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201 def _new_conn(self):
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202 """
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203 Return a fresh :class:`HTTPConnection`.
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204 """
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205 self.num_connections += 1
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206 log.info("Starting new HTTP connection (%d): %s" %
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207 (self.num_connections, self.host))
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208
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209 conn = self.ConnectionCls(host=self.host, port=self.port,
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210 timeout=self.timeout.connect_timeout,
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211 strict=self.strict, **self.conn_kw)
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212 return conn
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213
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214 def _get_conn(self, timeout=None):
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215 """
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216 Get a connection. Will return a pooled connection if one is available.
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217
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218 If no connections are available and :prop:`.block` is ``False``, then a
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219 fresh connection is returned.
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220
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221 :param timeout:
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222 Seconds to wait before giving up and raising
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223 :class:`urllib3.exceptions.EmptyPoolError` if the pool is empty and
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224 :prop:`.block` is ``True``.
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225 """
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226 conn = None
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227 try:
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228 conn = self.pool.get(block=self.block, timeout=timeout)
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229
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230 except AttributeError: # self.pool is None
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231 raise ClosedPoolError(self, "Pool is closed.")
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232
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233 except Empty:
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234 if self.block:
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235 raise EmptyPoolError(self,
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236 "Pool reached maximum size and no more "
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237 "connections are allowed.")
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238 pass # Oh well, we'll create a new connection then
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239
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240 # If this is a persistent connection, check if it got disconnected
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241 if conn and is_connection_dropped(conn):
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242 log.info("Resetting dropped connection: %s" % self.host)
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243 conn.close()
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244 if getattr(conn, 'auto_open', 1) == 0:
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245 # This is a proxied connection that has been mutated by
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246 # httplib._tunnel() and cannot be reused (since it would
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247 # attempt to bypass the proxy)
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248 conn = None
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249
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250 return conn or self._new_conn()
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251
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252 def _put_conn(self, conn):
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253 """
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254 Put a connection back into the pool.
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255
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256 :param conn:
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257 Connection object for the current host and port as returned by
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258 :meth:`._new_conn` or :meth:`._get_conn`.
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259
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260 If the pool is already full, the connection is closed and discarded
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261 because we exceeded maxsize. If connections are discarded frequently,
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262 then maxsize should be increased.
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263
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264 If the pool is closed, then the connection will be closed and discarded.
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265 """
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266 try:
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267 self.pool.put(conn, block=False)
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268 return # Everything is dandy, done.
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269 except AttributeError:
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270 # self.pool is None.
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271 pass
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272 except Full:
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273 # This should never happen if self.block == True
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274 log.warning(
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275 "Connection pool is full, discarding connection: %s" %
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276 self.host)
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277
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278 # Connection never got put back into the pool, close it.
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279 if conn:
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280 conn.close()
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281
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282 def _validate_conn(self, conn):
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283 """
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284 Called right before a request is made, after the socket is created.
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285 """
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286 pass
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287
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288 def _prepare_proxy(self, conn):
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289 # Nothing to do for HTTP connections.
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290 pass
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291
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292 def _get_timeout(self, timeout):
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293 """ Helper that always returns a :class:`urllib3.util.Timeout` """
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294 if timeout is _Default:
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295 return self.timeout.clone()
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296
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297 if isinstance(timeout, Timeout):
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298 return timeout.clone()
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299 else:
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300 # User passed us an int/float. This is for backwards compatibility,
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301 # can be removed later
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302 return Timeout.from_float(timeout)
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303
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304 def _raise_timeout(self, err, url, timeout_value):
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305 """Is the error actually a timeout? Will raise a ReadTimeout or pass"""
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306
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307 if isinstance(err, SocketTimeout):
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308 raise ReadTimeoutError(self, url, "Read timed out. (read timeout=%s)" % timeout_value)
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309
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310 # See the above comment about EAGAIN in Python 3. In Python 2 we have
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311 # to specifically catch it and throw the timeout error
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312 if hasattr(err, 'errno') and err.errno in _blocking_errnos:
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313 raise ReadTimeoutError(self, url, "Read timed out. (read timeout=%s)" % timeout_value)
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314
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315 # Catch possible read timeouts thrown as SSL errors. If not the
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316 # case, rethrow the original. We need to do this because of:
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317 # http://bugs.python.org/issue10272
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318 if 'timed out' in str(err) or 'did not complete (read)' in str(err): # Python 2.6
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319 raise ReadTimeoutError(self, url, "Read timed out. (read timeout=%s)" % timeout_value)
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320
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321 def _make_request(self, conn, method, url, timeout=_Default,
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322 **httplib_request_kw):
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323 """
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324 Perform a request on a given urllib connection object taken from our
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325 pool.
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326
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327 :param conn:
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328 a connection from one of our connection pools
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329
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330 :param timeout:
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331 Socket timeout in seconds for the request. This can be a
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332 float or integer, which will set the same timeout value for
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333 the socket connect and the socket read, or an instance of
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334 :class:`urllib3.util.Timeout`, which gives you more fine-grained
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335 control over your timeouts.
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336 """
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337 self.num_requests += 1
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338
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339 timeout_obj = self._get_timeout(timeout)
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340 timeout_obj.start_connect()
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341 conn.timeout = timeout_obj.connect_timeout
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342
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343 # Trigger any extra validation we need to do.
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344 try:
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345 self._validate_conn(conn)
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346 except (SocketTimeout, BaseSSLError) as e:
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347 # Py2 raises this as a BaseSSLError, Py3 raises it as socket timeout.
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348 self._raise_timeout(err=e, url=url, timeout_value=conn.timeout)
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349 raise
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350
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351 # conn.request() calls httplib.*.request, not the method in
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352 # urllib3.request. It also calls makefile (recv) on the socket.
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353 conn.request(method, url, **httplib_request_kw)
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354
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355 # Reset the timeout for the recv() on the socket
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356 read_timeout = timeout_obj.read_timeout
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357
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358 # App Engine doesn't have a sock attr
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359 if getattr(conn, 'sock', None):
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360 # In Python 3 socket.py will catch EAGAIN and return None when you
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361 # try and read into the file pointer created by http.client, which
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362 # instead raises a BadStatusLine exception. Instead of catching
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363 # the exception and assuming all BadStatusLine exceptions are read
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364 # timeouts, check for a zero timeout before making the request.
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365 if read_timeout == 0:
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366 raise ReadTimeoutError(
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367 self, url, "Read timed out. (read timeout=%s)" % read_timeout)
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368 if read_timeout is Timeout.DEFAULT_TIMEOUT:
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369 conn.sock.settimeout(socket.getdefaulttimeout())
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370 else: # None or a value
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371 conn.sock.settimeout(read_timeout)
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372
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373 # Receive the response from the server
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374 try:
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375 try: # Python 2.7, use buffering of HTTP responses
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376 httplib_response = conn.getresponse(buffering=True)
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377 except TypeError: # Python 2.6 and older
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378 httplib_response = conn.getresponse()
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379 except (SocketTimeout, BaseSSLError, SocketError) as e:
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380 self._raise_timeout(err=e, url=url, timeout_value=read_timeout)
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381 raise
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382
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383 # AppEngine doesn't have a version attr.
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384 http_version = getattr(conn, '_http_vsn_str', 'HTTP/?')
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385 log.debug("\"%s %s %s\" %s %s" % (method, url, http_version,
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386 httplib_response.status,
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387 httplib_response.length))
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388
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389 try:
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390 assert_header_parsing(httplib_response.msg)
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391 except HeaderParsingError as hpe: # Platform-specific: Python 3
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392 log.warning(
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393 'Failed to parse headers (url=%s): %s',
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394 self._absolute_url(url), hpe, exc_info=True)
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395
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396 return httplib_response
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397
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398 def _absolute_url(self, path):
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399 return Url(scheme=self.scheme, host=self.host, port=self.port, path=path).url
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400
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401 def close(self):
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402 """
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403 Close all pooled connections and disable the pool.
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404 """
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405 # Disable access to the pool
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406 old_pool, self.pool = self.pool, None
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407
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408 try:
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409 while True:
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410 conn = old_pool.get(block=False)
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411 if conn:
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412 conn.close()
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413
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414 except Empty:
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415 pass # Done.
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416
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417 def is_same_host(self, url):
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418 """
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419 Check if the given ``url`` is a member of the same host as this
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420 connection pool.
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421 """
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422 if url.startswith('/'):
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423 return True
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424
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425 # TODO: Add optional support for socket.gethostbyname checking.
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426 scheme, host, port = get_host(url)
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427
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428 # Use explicit default port for comparison when none is given
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429 if self.port and not port:
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430 port = port_by_scheme.get(scheme)
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431 elif not self.port and port == port_by_scheme.get(scheme):
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432 port = None
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433
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434 return (scheme, host, port) == (self.scheme, self.host, self.port)
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435
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436 def urlopen(self, method, url, body=None, headers=None, retries=None,
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437 redirect=True, assert_same_host=True, timeout=_Default,
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438 pool_timeout=None, release_conn=None, **response_kw):
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439 """
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440 Get a connection from the pool and perform an HTTP request. This is the
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441 lowest level call for making a request, so you'll need to specify all
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442 the raw details.
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443
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444 .. note::
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445
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446 More commonly, it's appropriate to use a convenience method provided
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447 by :class:`.RequestMethods`, such as :meth:`request`.
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448
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449 .. note::
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450
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451 `release_conn` will only behave as expected if
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452 `preload_content=False` because we want to make
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453 `preload_content=False` the default behaviour someday soon without
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454 breaking backwards compatibility.
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455
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456 :param method:
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457 HTTP request method (such as GET, POST, PUT, etc.)
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458
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459 :param body:
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460 Data to send in the request body (useful for creating
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461 POST requests, see HTTPConnectionPool.post_url for
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462 more convenience).
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463
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464 :param headers:
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465 Dictionary of custom headers to send, such as User-Agent,
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466 If-None-Match, etc. If None, pool headers are used. If provided,
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467 these headers completely replace any pool-specific headers.
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468
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469 :param retries:
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470 Configure the number of retries to allow before raising a
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471 :class:`~urllib3.exceptions.MaxRetryError` exception.
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472
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473 Pass ``None`` to retry until you receive a response. Pass a
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474 :class:`~urllib3.util.retry.Retry` object for fine-grained control
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475 over different types of retries.
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476 Pass an integer number to retry connection errors that many times,
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477 but no other types of errors. Pass zero to never retry.
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478
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479 If ``False``, then retries are disabled and any exception is raised
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480 immediately. Also, instead of raising a MaxRetryError on redirects,
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481 the redirect response will be returned.
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482
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483 :type retries: :class:`~urllib3.util.retry.Retry`, False, or an int.
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484
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485 :param redirect:
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486 If True, automatically handle redirects (status codes 301, 302,
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487 303, 307, 308). Each redirect counts as a retry. Disabling retries
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488 will disable redirect, too.
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489
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490 :param assert_same_host:
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491 If ``True``, will make sure that the host of the pool requests is
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492 consistent else will raise HostChangedError. When False, you can
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493 use the pool on an HTTP proxy and request foreign hosts.
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494
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495 :param timeout:
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496 If specified, overrides the default timeout for this one
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497 request. It may be a float (in seconds) or an instance of
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498 :class:`urllib3.util.Timeout`.
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499
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500 :param pool_timeout:
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501 If set and the pool is set to block=True, then this method will
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502 block for ``pool_timeout`` seconds and raise EmptyPoolError if no
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503 connection is available within the time period.
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504
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505 :param release_conn:
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506 If False, then the urlopen call will not release the connection
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507 back into the pool once a response is received (but will release if
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508 you read the entire contents of the response such as when
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509 `preload_content=True`). This is useful if you're not preloading
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diff changeset
510 the response's content immediately. You will need to call
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parents:
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511 ``r.release_conn()`` on the response ``r`` to return the connection
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parents:
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512 back into the pool. If None, it takes the value of
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parents:
diff changeset
513 ``response_kw.get('preload_content', True)``.
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parents:
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514
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parents:
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515 :param \**response_kw:
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516 Additional parameters are passed to
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
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parents:
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517 :meth:`urllib3.response.HTTPResponse.from_httplib`
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518 """
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parents:
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519 if headers is None:
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parents:
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520 headers = self.headers
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parents:
diff changeset
521
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522 if not isinstance(retries, Retry):
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parents:
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523 retries = Retry.from_int(retries, redirect=redirect, default=self.retries)
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parents:
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524
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525 if release_conn is None:
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parents:
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526 release_conn = response_kw.get('preload_content', True)
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parents:
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527
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bcclaywell
parents:
diff changeset
528 # Check host
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bcclaywell
parents:
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529 if assert_same_host and not self.is_same_host(url):
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parents:
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530 raise HostChangedError(self, url, retries)
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parents:
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531
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532 conn = None
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parents:
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533
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534 # Merge the proxy headers. Only do this in HTTP. We have to copy the
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bcclaywell
parents:
diff changeset
535 # headers dict so we can safely change it without those changes being
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bcclaywell
parents:
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536 # reflected in anyone else's copy.
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parents:
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537 if self.scheme == 'http':
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parents:
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538 headers = headers.copy()
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parents:
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539 headers.update(self.proxy_headers)
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parents:
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540
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parents:
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541 # Must keep the exception bound to a separate variable or else Python 3
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
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542 # complains about UnboundLocalError.
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543 err = None
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parents:
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544
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545 try:
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546 # Request a connection from the queue.
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547 timeout_obj = self._get_timeout(timeout)
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548 conn = self._get_conn(timeout=pool_timeout)
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549
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parents:
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550 conn.timeout = timeout_obj.connect_timeout
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bcclaywell
parents:
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551
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parents:
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552 is_new_proxy_conn = self.proxy is not None and not getattr(conn, 'sock', None)
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parents:
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553 if is_new_proxy_conn:
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bcclaywell
parents:
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554 self._prepare_proxy(conn)
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parents:
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555
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parents:
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556 # Make the request on the httplib connection object.
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parents:
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557 httplib_response = self._make_request(conn, method, url,
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parents:
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558 timeout=timeout_obj,
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bcclaywell
parents:
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559 body=body, headers=headers)
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parents:
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560
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561 # If we're going to release the connection in ``finally:``, then
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
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562 # the request doesn't need to know about the connection. Otherwise
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
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563 # it will also try to release it and we'll have a double-release
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bcclaywell
parents:
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564 # mess.
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565 response_conn = not release_conn and conn
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parents:
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566
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bcclaywell
parents:
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567 # Import httplib's response into our own wrapper object
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parents:
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568 response = HTTPResponse.from_httplib(httplib_response,
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parents:
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569 pool=self,
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bcclaywell
parents:
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570 connection=response_conn,
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bcclaywell
parents:
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571 **response_kw)
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parents:
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572
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bcclaywell
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573 # else:
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bcclaywell
parents:
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574 # The connection will be put back into the pool when
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bcclaywell
parents:
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575 # ``response.release_conn()`` is called (implicitly by
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
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parents:
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576 # ``response.read()``)
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577
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578 except Empty:
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bcclaywell
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579 # Timed out by queue.
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580 raise EmptyPoolError(self, "No pool connections are available.")
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parents:
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581
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parents:
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582 except (BaseSSLError, CertificateError) as e:
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parents:
diff changeset
583 # Close the connection. If a connection is reused on which there
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
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584 # was a Certificate error, the next request will certainly raise
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bcclaywell
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diff changeset
585 # another Certificate error.
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bcclaywell
parents:
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586 conn = conn and conn.close()
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587 release_conn = True
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parents:
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588 raise SSLError(e)
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parents:
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589
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parents:
diff changeset
590 except SSLError:
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
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parents:
diff changeset
591 # Treat SSLError separately from BaseSSLError to preserve
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
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592 # traceback.
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parents:
diff changeset
593 conn = conn and conn.close()
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parents:
diff changeset
594 release_conn = True
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
595 raise
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parents:
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596
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597 except (TimeoutError, HTTPException, SocketError, ProtocolError) as e:
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
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parents:
diff changeset
598 # Discard the connection for these exceptions. It will be
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parents:
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599 # be replaced during the next _get_conn() call.
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600 conn = conn and conn.close()
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parents:
diff changeset
601 release_conn = True
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parents:
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602
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parents:
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603 if isinstance(e, (SocketError, NewConnectionError)) and self.proxy:
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parents:
diff changeset
604 e = ProxyError('Cannot connect to proxy.', e)
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parents:
diff changeset
605 elif isinstance(e, (SocketError, HTTPException)):
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parents:
diff changeset
606 e = ProtocolError('Connection aborted.', e)
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parents:
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607
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parents:
diff changeset
608 retries = retries.increment(method, url, error=e, _pool=self,
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609 _stacktrace=sys.exc_info()[2])
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610 retries.sleep()
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611
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parents:
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612 # Keep track of the error for the retry warning.
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613 err = e
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614
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615 finally:
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616 if release_conn:
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617 # Put the connection back to be reused. If the connection is
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618 # expired then it will be None, which will get replaced with a
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619 # fresh connection during _get_conn.
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parents:
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620 self._put_conn(conn)
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621
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622 if not conn:
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bcclaywell
parents:
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623 # Try again
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parents:
diff changeset
624 log.warning("Retrying (%r) after connection "
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parents:
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625 "broken by '%r': %s" % (retries, err, url))
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parents:
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626 return self.urlopen(method, url, body, headers, retries,
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627 redirect, assert_same_host,
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parents:
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628 timeout=timeout, pool_timeout=pool_timeout,
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parents:
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629 release_conn=release_conn, **response_kw)
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parents:
diff changeset
630
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bcclaywell
parents:
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631 # Handle redirect?
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parents:
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632 redirect_location = redirect and response.get_redirect_location()
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parents:
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633 if redirect_location:
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634 if response.status == 303:
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parents:
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635 method = 'GET'
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parents:
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636
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parents:
diff changeset
637 try:
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parents:
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638 retries = retries.increment(method, url, response=response, _pool=self)
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639 except MaxRetryError:
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parents:
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640 if retries.raise_on_redirect:
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parents:
diff changeset
641 # Release the connection for this response, since we're not
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bcclaywell
parents:
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642 # returning it to be released manually.
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bcclaywell
parents:
diff changeset
643 response.release_conn()
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bcclaywell
parents:
diff changeset
644 raise
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parents:
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645 return response
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parents:
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646
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parents:
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647 log.info("Redirecting %s -> %s" % (url, redirect_location))
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parents:
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648 return self.urlopen(method, redirect_location, body, headers,
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parents:
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649 retries=retries, redirect=redirect,
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parents:
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650 assert_same_host=assert_same_host,
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parents:
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651 timeout=timeout, pool_timeout=pool_timeout,
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parents:
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652 release_conn=release_conn, **response_kw)
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parents:
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653
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parents:
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654 # Check if we should retry the HTTP response.
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parents:
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655 if retries.is_forced_retry(method, status_code=response.status):
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parents:
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656 retries = retries.increment(method, url, response=response, _pool=self)
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657 retries.sleep()
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parents:
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658 log.info("Forced retry: %s" % url)
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parents:
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659 return self.urlopen(method, url, body, headers,
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parents:
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660 retries=retries, redirect=redirect,
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661 assert_same_host=assert_same_host,
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662 timeout=timeout, pool_timeout=pool_timeout,
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663 release_conn=release_conn, **response_kw)
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664
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parents:
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665 return response
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parents:
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666
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parents:
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667
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668 class HTTPSConnectionPool(HTTPConnectionPool):
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669 """
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670 Same as :class:`.HTTPConnectionPool`, but HTTPS.
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parents:
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671
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672 When Python is compiled with the :mod:`ssl` module, then
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parents:
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673 :class:`.VerifiedHTTPSConnection` is used, which *can* verify certificates,
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674 instead of :class:`.HTTPSConnection`.
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parents:
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675
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parents:
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676 :class:`.VerifiedHTTPSConnection` uses one of ``assert_fingerprint``,
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parents:
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677 ``assert_hostname`` and ``host`` in this order to verify connections.
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parents:
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678 If ``assert_hostname`` is False, no verification is done.
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parents:
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679
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parents:
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680 The ``key_file``, ``cert_file``, ``cert_reqs``, ``ca_certs``,
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parents:
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681 ``ca_cert_dir``, and ``ssl_version`` are only used if :mod:`ssl` is
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parents:
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682 available and are fed into :meth:`urllib3.util.ssl_wrap_socket` to upgrade
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bcclaywell
parents:
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683 the connection socket into an SSL socket.
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parents:
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684 """
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parents:
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685
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parents:
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686 scheme = 'https'
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parents:
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687 ConnectionCls = HTTPSConnection
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parents:
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688
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parents:
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689 def __init__(self, host, port=None,
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690 strict=False, timeout=Timeout.DEFAULT_TIMEOUT, maxsize=1,
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691 block=False, headers=None, retries=None,
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parents:
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692 _proxy=None, _proxy_headers=None,
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parents:
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693 key_file=None, cert_file=None, cert_reqs=None,
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parents:
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694 ca_certs=None, ssl_version=None,
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parents:
diff changeset
695 assert_hostname=None, assert_fingerprint=None,
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parents:
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696 ca_cert_dir=None, **conn_kw):
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parents:
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697
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parents:
diff changeset
698 HTTPConnectionPool.__init__(self, host, port, strict, timeout, maxsize,
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parents:
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699 block, headers, retries, _proxy, _proxy_headers,
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parents:
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700 **conn_kw)
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parents:
diff changeset
701
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parents:
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702 if ca_certs and cert_reqs is None:
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parents:
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703 cert_reqs = 'CERT_REQUIRED'
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parents:
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704
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parents:
diff changeset
705 self.key_file = key_file
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parents:
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706 self.cert_file = cert_file
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parents:
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707 self.cert_reqs = cert_reqs
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parents:
diff changeset
708 self.ca_certs = ca_certs
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parents:
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709 self.ca_cert_dir = ca_cert_dir
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parents:
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710 self.ssl_version = ssl_version
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parents:
diff changeset
711 self.assert_hostname = assert_hostname
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parents:
diff changeset
712 self.assert_fingerprint = assert_fingerprint
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bcclaywell
parents:
diff changeset
713
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bcclaywell
parents:
diff changeset
714 def _prepare_conn(self, conn):
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bcclaywell
parents:
diff changeset
715 """
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bcclaywell
parents:
diff changeset
716 Prepare the ``connection`` for :meth:`urllib3.util.ssl_wrap_socket`
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bcclaywell
parents:
diff changeset
717 and establish the tunnel if proxy is used.
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bcclaywell
parents:
diff changeset
718 """
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bcclaywell
parents:
diff changeset
719
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bcclaywell
parents:
diff changeset
720 if isinstance(conn, VerifiedHTTPSConnection):
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bcclaywell
parents:
diff changeset
721 conn.set_cert(key_file=self.key_file,
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bcclaywell
parents:
diff changeset
722 cert_file=self.cert_file,
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bcclaywell
parents:
diff changeset
723 cert_reqs=self.cert_reqs,
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bcclaywell
parents:
diff changeset
724 ca_certs=self.ca_certs,
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bcclaywell
parents:
diff changeset
725 ca_cert_dir=self.ca_cert_dir,
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bcclaywell
parents:
diff changeset
726 assert_hostname=self.assert_hostname,
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bcclaywell
parents:
diff changeset
727 assert_fingerprint=self.assert_fingerprint)
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parents:
diff changeset
728 conn.ssl_version = self.ssl_version
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bcclaywell
parents:
diff changeset
729
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bcclaywell
parents:
diff changeset
730 return conn
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bcclaywell
parents:
diff changeset
731
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parents:
diff changeset
732 def _prepare_proxy(self, conn):
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parents:
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733 """
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
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734 Establish tunnel connection early, because otherwise httplib
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
735 would improperly set Host: header to proxy's IP:port.
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bcclaywell
parents:
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736 """
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bcclaywell
parents:
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737 # Python 2.7+
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bcclaywell
parents:
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738 try:
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bcclaywell
parents:
diff changeset
739 set_tunnel = conn.set_tunnel
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bcclaywell
parents:
diff changeset
740 except AttributeError: # Platform-specific: Python 2.6
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bcclaywell
parents:
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741 set_tunnel = conn._set_tunnel
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bcclaywell
parents:
diff changeset
742
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bcclaywell
parents:
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743 if sys.version_info <= (2, 6, 4) and not self.proxy_headers: # Python 2.6.4 and older
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bcclaywell
parents:
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744 set_tunnel(self.host, self.port)
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bcclaywell
parents:
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745 else:
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bcclaywell
parents:
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746 set_tunnel(self.host, self.port, self.proxy_headers)
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bcclaywell
parents:
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747
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bcclaywell
parents:
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748 conn.connect()
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bcclaywell
parents:
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749
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bcclaywell
parents:
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750 def _new_conn(self):
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bcclaywell
parents:
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751 """
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bcclaywell
parents:
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752 Return a fresh :class:`httplib.HTTPSConnection`.
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bcclaywell
parents:
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753 """
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bcclaywell
parents:
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754 self.num_connections += 1
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bcclaywell
parents:
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755 log.info("Starting new HTTPS connection (%d): %s"
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bcclaywell
parents:
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756 % (self.num_connections, self.host))
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bcclaywell
parents:
diff changeset
757
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bcclaywell
parents:
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758 if not self.ConnectionCls or self.ConnectionCls is DummyConnection:
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bcclaywell
parents:
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759 raise SSLError("Can't connect to HTTPS URL because the SSL "
d67268158946 planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
bcclaywell
parents:
diff changeset
760 "module is not available.")
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bcclaywell
parents:
diff changeset
761
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762 actual_host = self.host
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763 actual_port = self.port
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764 if self.proxy is not None:
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765 actual_host = self.proxy.host
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766 actual_port = self.proxy.port
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767
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768 conn = self.ConnectionCls(host=actual_host, port=actual_port,
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769 timeout=self.timeout.connect_timeout,
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770 strict=self.strict, **self.conn_kw)
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771
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772 return self._prepare_conn(conn)
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773
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774 def _validate_conn(self, conn):
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775 """
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776 Called right before a request is made, after the socket is created.
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777 """
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778 super(HTTPSConnectionPool, self)._validate_conn(conn)
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779
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780 # Force connect early to allow us to validate the connection.
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781 if not getattr(conn, 'sock', None): # AppEngine might not have `.sock`
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782 conn.connect()
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783
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784 if not conn.is_verified:
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785 warnings.warn((
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786 'Unverified HTTPS request is being made. '
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787 'Adding certificate verification is strongly advised. See: '
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788 'https://urllib3.readthedocs.org/en/latest/security.html'),
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789 InsecureRequestWarning)
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790
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791
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792 def connection_from_url(url, **kw):
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793 """
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794 Given a url, return an :class:`.ConnectionPool` instance of its host.
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795
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796 This is a shortcut for not having to parse out the scheme, host, and port
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797 of the url before creating an :class:`.ConnectionPool` instance.
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798
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799 :param url:
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800 Absolute URL string that must include the scheme. Port is optional.
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801
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802 :param \**kw:
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803 Passes additional parameters to the constructor of the appropriate
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804 :class:`.ConnectionPool`. Useful for specifying things like
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805 timeout, maxsize, headers, etc.
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806
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807 Example::
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808
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809 >>> conn = connection_from_url('http://google.com/')
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810 >>> r = conn.request('GET', '/')
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811 """
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812 scheme, host, port = get_host(url)
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813 if scheme == 'https':
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814 return HTTPSConnectionPool(host, port=port, **kw)
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815 else:
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816 return HTTPConnectionPool(host, port=port, **kw)