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

planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
author bcclaywell
date Mon, 12 Oct 2015 17:43:33 -0400
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1 from contextlib import contextmanager
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2 import zlib
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3 import io
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4 from socket import timeout as SocketTimeout
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5
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6 from ._collections import HTTPHeaderDict
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7 from .exceptions import (
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8 ProtocolError, DecodeError, ReadTimeoutError, ResponseNotChunked
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9 )
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10 from .packages.six import string_types as basestring, binary_type, PY3
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11 from .packages.six.moves import http_client as httplib
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12 from .connection import HTTPException, BaseSSLError
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13 from .util.response import is_fp_closed, is_response_to_head
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14
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15
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16 class DeflateDecoder(object):
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17
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18 def __init__(self):
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19 self._first_try = True
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20 self._data = binary_type()
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21 self._obj = zlib.decompressobj()
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22
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23 def __getattr__(self, name):
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24 return getattr(self._obj, name)
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25
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26 def decompress(self, data):
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27 if not data:
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28 return data
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29
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30 if not self._first_try:
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31 return self._obj.decompress(data)
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32
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33 self._data += data
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34 try:
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35 return self._obj.decompress(data)
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36 except zlib.error:
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37 self._first_try = False
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38 self._obj = zlib.decompressobj(-zlib.MAX_WBITS)
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39 try:
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40 return self.decompress(self._data)
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41 finally:
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42 self._data = None
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43
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44
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45 class GzipDecoder(object):
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46
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47 def __init__(self):
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48 self._obj = zlib.decompressobj(16 + zlib.MAX_WBITS)
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49
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50 def __getattr__(self, name):
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51 return getattr(self._obj, name)
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52
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53 def decompress(self, data):
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54 if not data:
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55 return data
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56 return self._obj.decompress(data)
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57
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58
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59 def _get_decoder(mode):
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60 if mode == 'gzip':
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61 return GzipDecoder()
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62
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63 return DeflateDecoder()
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64
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65
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66 class HTTPResponse(io.IOBase):
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67 """
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68 HTTP Response container.
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69
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70 Backwards-compatible to httplib's HTTPResponse but the response ``body`` is
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71 loaded and decoded on-demand when the ``data`` property is accessed. This
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72 class is also compatible with the Python standard library's :mod:`io`
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73 module, and can hence be treated as a readable object in the context of that
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74 framework.
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75
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76 Extra parameters for behaviour not present in httplib.HTTPResponse:
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77
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78 :param preload_content:
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79 If True, the response's body will be preloaded during construction.
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80
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81 :param decode_content:
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82 If True, attempts to decode specific content-encoding's based on headers
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83 (like 'gzip' and 'deflate') will be skipped and raw data will be used
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84 instead.
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85
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86 :param original_response:
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87 When this HTTPResponse wrapper is generated from an httplib.HTTPResponse
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88 object, it's convenient to include the original for debug purposes. It's
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89 otherwise unused.
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90 """
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91
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92 CONTENT_DECODERS = ['gzip', 'deflate']
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93 REDIRECT_STATUSES = [301, 302, 303, 307, 308]
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94
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95 def __init__(self, body='', headers=None, status=0, version=0, reason=None,
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96 strict=0, preload_content=True, decode_content=True,
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97 original_response=None, pool=None, connection=None):
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98
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99 if isinstance(headers, HTTPHeaderDict):
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100 self.headers = headers
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101 else:
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102 self.headers = HTTPHeaderDict(headers)
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103 self.status = status
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104 self.version = version
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105 self.reason = reason
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106 self.strict = strict
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107 self.decode_content = decode_content
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108
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109 self._decoder = None
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110 self._body = None
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111 self._fp = None
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112 self._original_response = original_response
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113 self._fp_bytes_read = 0
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114
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115 if body and isinstance(body, (basestring, binary_type)):
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116 self._body = body
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117
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118 self._pool = pool
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119 self._connection = connection
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120
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121 if hasattr(body, 'read'):
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122 self._fp = body
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123
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124 # Are we using the chunked-style of transfer encoding?
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125 self.chunked = False
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126 self.chunk_left = None
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127 tr_enc = self.headers.get('transfer-encoding', '').lower()
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128 # Don't incur the penalty of creating a list and then discarding it
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129 encodings = (enc.strip() for enc in tr_enc.split(","))
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130 if "chunked" in encodings:
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131 self.chunked = True
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132
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133 # We certainly don't want to preload content when the response is chunked.
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134 if not self.chunked and preload_content and not self._body:
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135 self._body = self.read(decode_content=decode_content)
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136
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137 def get_redirect_location(self):
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138 """
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139 Should we redirect and where to?
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140
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141 :returns: Truthy redirect location string if we got a redirect status
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142 code and valid location. ``None`` if redirect status and no
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143 location. ``False`` if not a redirect status code.
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144 """
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145 if self.status in self.REDIRECT_STATUSES:
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146 return self.headers.get('location')
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147
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148 return False
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149
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150 def release_conn(self):
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151 if not self._pool or not self._connection:
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152 return
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153
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154 self._pool._put_conn(self._connection)
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155 self._connection = None
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156
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157 @property
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158 def data(self):
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159 # For backwords-compat with earlier urllib3 0.4 and earlier.
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160 if self._body:
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161 return self._body
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162
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163 if self._fp:
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164 return self.read(cache_content=True)
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165
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166 def tell(self):
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167 """
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168 Obtain the number of bytes pulled over the wire so far. May differ from
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169 the amount of content returned by :meth:``HTTPResponse.read`` if bytes
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170 are encoded on the wire (e.g, compressed).
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171 """
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172 return self._fp_bytes_read
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173
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174 def _init_decoder(self):
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175 """
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176 Set-up the _decoder attribute if necessar.
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177 """
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178 # Note: content-encoding value should be case-insensitive, per RFC 7230
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179 # Section 3.2
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180 content_encoding = self.headers.get('content-encoding', '').lower()
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181 if self._decoder is None and content_encoding in self.CONTENT_DECODERS:
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182 self._decoder = _get_decoder(content_encoding)
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183
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184 def _decode(self, data, decode_content, flush_decoder):
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185 """
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186 Decode the data passed in and potentially flush the decoder.
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187 """
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188 try:
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189 if decode_content and self._decoder:
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190 data = self._decoder.decompress(data)
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191 except (IOError, zlib.error) as e:
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192 content_encoding = self.headers.get('content-encoding', '').lower()
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193 raise DecodeError(
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194 "Received response with content-encoding: %s, but "
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195 "failed to decode it." % content_encoding, e)
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196
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197 if flush_decoder and decode_content and self._decoder:
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198 buf = self._decoder.decompress(binary_type())
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199 data += buf + self._decoder.flush()
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200
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201 return data
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202
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203 @contextmanager
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204 def _error_catcher(self):
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205 """
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206 Catch low-level python exceptions, instead re-raising urllib3
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207 variants, so that low-level exceptions are not leaked in the
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208 high-level api.
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209
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210 On exit, release the connection back to the pool.
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211 """
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212 try:
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213 try:
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214 yield
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215
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216 except SocketTimeout:
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217 # FIXME: Ideally we'd like to include the url in the ReadTimeoutError but
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218 # there is yet no clean way to get at it from this context.
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219 raise ReadTimeoutError(self._pool, None, 'Read timed out.')
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220
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221 except BaseSSLError as e:
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222 # FIXME: Is there a better way to differentiate between SSLErrors?
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223 if 'read operation timed out' not in str(e): # Defensive:
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224 # This shouldn't happen but just in case we're missing an edge
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225 # case, let's avoid swallowing SSL errors.
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226 raise
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227
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228 raise ReadTimeoutError(self._pool, None, 'Read timed out.')
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229
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230 except HTTPException as e:
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231 # This includes IncompleteRead.
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232 raise ProtocolError('Connection broken: %r' % e, e)
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233 except Exception:
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234 # The response may not be closed but we're not going to use it anymore
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235 # so close it now to ensure that the connection is released back to the pool.
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236 if self._original_response and not self._original_response.isclosed():
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237 self._original_response.close()
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238
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239 raise
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240 finally:
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241 if self._original_response and self._original_response.isclosed():
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242 self.release_conn()
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243
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244 def read(self, amt=None, decode_content=None, cache_content=False):
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245 """
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246 Similar to :meth:`httplib.HTTPResponse.read`, but with two additional
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247 parameters: ``decode_content`` and ``cache_content``.
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248
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249 :param amt:
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250 How much of the content to read. If specified, caching is skipped
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251 because it doesn't make sense to cache partial content as the full
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252 response.
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253
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254 :param decode_content:
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255 If True, will attempt to decode the body based on the
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256 'content-encoding' header.
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257
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258 :param cache_content:
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259 If True, will save the returned data such that the same result is
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260 returned despite of the state of the underlying file object. This
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261 is useful if you want the ``.data`` property to continue working
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262 after having ``.read()`` the file object. (Overridden if ``amt`` is
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263 set.)
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264 """
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265 self._init_decoder()
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266 if decode_content is None:
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267 decode_content = self.decode_content
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268
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269 if self._fp is None:
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270 return
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271
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272 flush_decoder = False
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273 data = None
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274
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275 with self._error_catcher():
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276 if amt is None:
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277 # cStringIO doesn't like amt=None
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278 data = self._fp.read()
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279 flush_decoder = True
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280 else:
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281 cache_content = False
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282 data = self._fp.read(amt)
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283 if amt != 0 and not data: # Platform-specific: Buggy versions of Python.
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284 # Close the connection when no data is returned
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285 #
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286 # This is redundant to what httplib/http.client _should_
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287 # already do. However, versions of python released before
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288 # December 15, 2012 (http://bugs.python.org/issue16298) do
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289 # not properly close the connection in all cases. There is
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290 # no harm in redundantly calling close.
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291 self._fp.close()
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292 flush_decoder = True
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293
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294 if data:
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295 self._fp_bytes_read += len(data)
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296
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297 data = self._decode(data, decode_content, flush_decoder)
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298
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299 if cache_content:
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300 self._body = data
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301
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302 return data
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303
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304
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305 def stream(self, amt=2**16, decode_content=None):
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306 """
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307 A generator wrapper for the read() method. A call will block until
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308 ``amt`` bytes have been read from the connection or until the
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309 connection is closed.
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310
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311 :param amt:
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312 How much of the content to read. The generator will return up to
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313 much data per iteration, but may return less. This is particularly
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314 likely when using compressed data. However, the empty string will
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315 never be returned.
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316
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317 :param decode_content:
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318 If True, will attempt to decode the body based on the
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319 'content-encoding' header.
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320 """
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321 if self.chunked:
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322 for line in self.read_chunked(amt, decode_content=decode_content):
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323 yield line
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324 else:
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325 while not is_fp_closed(self._fp):
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326 data = self.read(amt=amt, decode_content=decode_content)
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327
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328 if data:
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329 yield data
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330
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331 @classmethod
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332 def from_httplib(ResponseCls, r, **response_kw):
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333 """
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334 Given an :class:`httplib.HTTPResponse` instance ``r``, return a
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335 corresponding :class:`urllib3.response.HTTPResponse` object.
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336
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337 Remaining parameters are passed to the HTTPResponse constructor, along
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338 with ``original_response=r``.
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339 """
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340 headers = r.msg
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341
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342 if not isinstance(headers, HTTPHeaderDict):
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343 if PY3: # Python 3
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344 headers = HTTPHeaderDict(headers.items())
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345 else: # Python 2
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346 headers = HTTPHeaderDict.from_httplib(headers)
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347
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348 # HTTPResponse objects in Python 3 don't have a .strict attribute
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349 strict = getattr(r, 'strict', 0)
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350 resp = ResponseCls(body=r,
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351 headers=headers,
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352 status=r.status,
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353 version=r.version,
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354 reason=r.reason,
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355 strict=strict,
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356 original_response=r,
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357 **response_kw)
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358 return resp
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359
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360 # Backwards-compatibility methods for httplib.HTTPResponse
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361 def getheaders(self):
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362 return self.headers
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363
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364 def getheader(self, name, default=None):
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365 return self.headers.get(name, default)
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366
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367 # Overrides from io.IOBase
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368 def close(self):
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369 if not self.closed:
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370 self._fp.close()
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371
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372 @property
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373 def closed(self):
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374 if self._fp is None:
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375 return True
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376 elif hasattr(self._fp, 'closed'):
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377 return self._fp.closed
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378 elif hasattr(self._fp, 'isclosed'): # Python 2
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379 return self._fp.isclosed()
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380 else:
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381 return True
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382
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383 def fileno(self):
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384 if self._fp is None:
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385 raise IOError("HTTPResponse has no file to get a fileno from")
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386 elif hasattr(self._fp, "fileno"):
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387 return self._fp.fileno()
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388 else:
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389 raise IOError("The file-like object this HTTPResponse is wrapped "
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390 "around has no file descriptor")
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391
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392 def flush(self):
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393 if self._fp is not None and hasattr(self._fp, 'flush'):
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394 return self._fp.flush()
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395
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396 def readable(self):
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397 # This method is required for `io` module compatibility.
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398 return True
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399
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400 def readinto(self, b):
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401 # This method is required for `io` module compatibility.
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402 temp = self.read(len(b))
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403 if len(temp) == 0:
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404 return 0
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405 else:
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406 b[:len(temp)] = temp
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407 return len(temp)
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408
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409 def _update_chunk_length(self):
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410 # First, we'll figure out length of a chunk and then
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411 # we'll try to read it from socket.
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412 if self.chunk_left is not None:
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413 return
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414 line = self._fp.fp.readline()
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415 line = line.split(b';', 1)[0]
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416 try:
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417 self.chunk_left = int(line, 16)
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418 except ValueError:
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419 # Invalid chunked protocol response, abort.
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420 self.close()
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421 raise httplib.IncompleteRead(line)
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422
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423 def _handle_chunk(self, amt):
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424 returned_chunk = None
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425 if amt is None:
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426 chunk = self._fp._safe_read(self.chunk_left)
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427 returned_chunk = chunk
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428 self._fp._safe_read(2) # Toss the CRLF at the end of the chunk.
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429 self.chunk_left = None
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430 elif amt < self.chunk_left:
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431 value = self._fp._safe_read(amt)
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432 self.chunk_left = self.chunk_left - amt
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433 returned_chunk = value
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434 elif amt == self.chunk_left:
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435 value = self._fp._safe_read(amt)
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436 self._fp._safe_read(2) # Toss the CRLF at the end of the chunk.
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437 self.chunk_left = None
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438 returned_chunk = value
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439 else: # amt > self.chunk_left
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440 returned_chunk = self._fp._safe_read(self.chunk_left)
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441 self._fp._safe_read(2) # Toss the CRLF at the end of the chunk.
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442 self.chunk_left = None
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443 return returned_chunk
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444
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445 def read_chunked(self, amt=None, decode_content=None):
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446 """
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447 Similar to :meth:`HTTPResponse.read`, but with an additional
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448 parameter: ``decode_content``.
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449
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450 :param decode_content:
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451 If True, will attempt to decode the body based on the
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452 'content-encoding' header.
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453 """
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454 self._init_decoder()
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455 # FIXME: Rewrite this method and make it a class with a better structured logic.
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456 if not self.chunked:
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457 raise ResponseNotChunked("Response is not chunked. "
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458 "Header 'transfer-encoding: chunked' is missing.")
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459
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460 # Don't bother reading the body of a HEAD request.
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461 if self._original_response and is_response_to_head(self._original_response):
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462 self._original_response.close()
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463 return
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464
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465 with self._error_catcher():
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466 while True:
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467 self._update_chunk_length()
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468 if self.chunk_left == 0:
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469 break
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470 chunk = self._handle_chunk(amt)
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471 yield self._decode(chunk, decode_content=decode_content,
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472 flush_decoder=True)
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473
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474 # Chunk content ends with \r\n: discard it.
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475 while True:
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476 line = self._fp.fp.readline()
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477 if not line:
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478 # Some sites may not end with '\r\n'.
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479 break
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480 if line == b'\r\n':
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481 break
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482
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483 # We read everything; close the "file".
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484 if self._original_response:
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485 self._original_response.close()