Mercurial > repos > shellac > sam_consensus_v3
annotate env/lib/python3.9/site-packages/urllib3/_collections.py @ 0:4f3585e2f14b draft default tip
"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
author | shellac |
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date | Mon, 22 Mar 2021 18:12:50 +0000 |
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1 from __future__ import absolute_import |
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2 |
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3 try: |
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4 from collections.abc import Mapping, MutableMapping |
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5 except ImportError: |
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6 from collections import Mapping, MutableMapping |
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7 try: |
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8 from threading import RLock |
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9 except ImportError: # Platform-specific: No threads available |
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10 |
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11 class RLock: |
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12 def __enter__(self): |
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13 pass |
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14 |
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15 def __exit__(self, exc_type, exc_value, traceback): |
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16 pass |
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17 |
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18 |
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19 from collections import OrderedDict |
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20 |
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21 from .exceptions import InvalidHeader |
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22 from .packages import six |
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23 from .packages.six import iterkeys, itervalues |
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24 |
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25 __all__ = ["RecentlyUsedContainer", "HTTPHeaderDict"] |
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26 |
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27 |
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28 _Null = object() |
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29 |
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30 |
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31 class RecentlyUsedContainer(MutableMapping): |
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32 """ |
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33 Provides a thread-safe dict-like container which maintains up to |
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34 ``maxsize`` keys while throwing away the least-recently-used keys beyond |
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35 ``maxsize``. |
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36 |
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37 :param maxsize: |
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38 Maximum number of recent elements to retain. |
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39 |
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40 :param dispose_func: |
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41 Every time an item is evicted from the container, |
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42 ``dispose_func(value)`` is called. Callback which will get called |
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43 """ |
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44 |
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45 ContainerCls = OrderedDict |
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46 |
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47 def __init__(self, maxsize=10, dispose_func=None): |
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48 self._maxsize = maxsize |
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49 self.dispose_func = dispose_func |
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50 |
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51 self._container = self.ContainerCls() |
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52 self.lock = RLock() |
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53 |
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54 def __getitem__(self, key): |
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55 # Re-insert the item, moving it to the end of the eviction line. |
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56 with self.lock: |
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57 item = self._container.pop(key) |
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58 self._container[key] = item |
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59 return item |
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60 |
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61 def __setitem__(self, key, value): |
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62 evicted_value = _Null |
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63 with self.lock: |
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64 # Possibly evict the existing value of 'key' |
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65 evicted_value = self._container.get(key, _Null) |
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66 self._container[key] = value |
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67 |
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68 # If we didn't evict an existing value, we might have to evict the |
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69 # least recently used item from the beginning of the container. |
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70 if len(self._container) > self._maxsize: |
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71 _key, evicted_value = self._container.popitem(last=False) |
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72 |
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73 if self.dispose_func and evicted_value is not _Null: |
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74 self.dispose_func(evicted_value) |
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75 |
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76 def __delitem__(self, key): |
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77 with self.lock: |
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78 value = self._container.pop(key) |
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79 |
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80 if self.dispose_func: |
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81 self.dispose_func(value) |
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82 |
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83 def __len__(self): |
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84 with self.lock: |
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85 return len(self._container) |
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86 |
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87 def __iter__(self): |
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88 raise NotImplementedError( |
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89 "Iteration over this class is unlikely to be threadsafe." |
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90 ) |
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91 |
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92 def clear(self): |
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93 with self.lock: |
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94 # Copy pointers to all values, then wipe the mapping |
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95 values = list(itervalues(self._container)) |
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96 self._container.clear() |
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97 |
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98 if self.dispose_func: |
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99 for value in values: |
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100 self.dispose_func(value) |
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101 |
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102 def keys(self): |
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103 with self.lock: |
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104 return list(iterkeys(self._container)) |
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105 |
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106 |
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107 class HTTPHeaderDict(MutableMapping): |
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108 """ |
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109 :param headers: |
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110 An iterable of field-value pairs. Must not contain multiple field names |
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111 when compared case-insensitively. |
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112 |
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113 :param kwargs: |
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114 Additional field-value pairs to pass in to ``dict.update``. |
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115 |
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116 A ``dict`` like container for storing HTTP Headers. |
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117 |
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118 Field names are stored and compared case-insensitively in compliance with |
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119 RFC 7230. Iteration provides the first case-sensitive key seen for each |
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120 case-insensitive pair. |
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121 |
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122 Using ``__setitem__`` syntax overwrites fields that compare equal |
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123 case-insensitively in order to maintain ``dict``'s api. For fields that |
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124 compare equal, instead create a new ``HTTPHeaderDict`` and use ``.add`` |
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125 in a loop. |
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126 |
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127 If multiple fields that are equal case-insensitively are passed to the |
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128 constructor or ``.update``, the behavior is undefined and some will be |
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129 lost. |
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130 |
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131 >>> headers = HTTPHeaderDict() |
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132 >>> headers.add('Set-Cookie', 'foo=bar') |
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133 >>> headers.add('set-cookie', 'baz=quxx') |
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134 >>> headers['content-length'] = '7' |
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135 >>> headers['SET-cookie'] |
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136 'foo=bar, baz=quxx' |
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137 >>> headers['Content-Length'] |
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138 '7' |
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139 """ |
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140 |
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141 def __init__(self, headers=None, **kwargs): |
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142 super(HTTPHeaderDict, self).__init__() |
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143 self._container = OrderedDict() |
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144 if headers is not None: |
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145 if isinstance(headers, HTTPHeaderDict): |
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146 self._copy_from(headers) |
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147 else: |
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148 self.extend(headers) |
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149 if kwargs: |
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150 self.extend(kwargs) |
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151 |
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152 def __setitem__(self, key, val): |
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153 self._container[key.lower()] = [key, val] |
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154 return self._container[key.lower()] |
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155 |
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156 def __getitem__(self, key): |
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157 val = self._container[key.lower()] |
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158 return ", ".join(val[1:]) |
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159 |
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160 def __delitem__(self, key): |
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161 del self._container[key.lower()] |
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162 |
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163 def __contains__(self, key): |
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164 return key.lower() in self._container |
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165 |
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166 def __eq__(self, other): |
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167 if not isinstance(other, Mapping) and not hasattr(other, "keys"): |
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168 return False |
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169 if not isinstance(other, type(self)): |
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170 other = type(self)(other) |
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171 return dict((k.lower(), v) for k, v in self.itermerged()) == dict( |
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172 (k.lower(), v) for k, v in other.itermerged() |
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173 ) |
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174 |
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175 def __ne__(self, other): |
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176 return not self.__eq__(other) |
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177 |
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178 if six.PY2: # Python 2 |
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179 iterkeys = MutableMapping.iterkeys |
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180 itervalues = MutableMapping.itervalues |
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181 |
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182 __marker = object() |
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183 |
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184 def __len__(self): |
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185 return len(self._container) |
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186 |
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187 def __iter__(self): |
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188 # Only provide the originally cased names |
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189 for vals in self._container.values(): |
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190 yield vals[0] |
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191 |
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192 def pop(self, key, default=__marker): |
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193 """D.pop(k[,d]) -> v, remove specified key and return the corresponding value. |
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194 If key is not found, d is returned if given, otherwise KeyError is raised. |
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195 """ |
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196 # Using the MutableMapping function directly fails due to the private marker. |
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197 # Using ordinary dict.pop would expose the internal structures. |
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198 # So let's reinvent the wheel. |
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199 try: |
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200 value = self[key] |
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201 except KeyError: |
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202 if default is self.__marker: |
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203 raise |
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204 return default |
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205 else: |
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206 del self[key] |
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207 return value |
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208 |
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209 def discard(self, key): |
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210 try: |
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211 del self[key] |
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212 except KeyError: |
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213 pass |
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214 |
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215 def add(self, key, val): |
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216 """Adds a (name, value) pair, doesn't overwrite the value if it already |
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217 exists. |
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218 |
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219 >>> headers = HTTPHeaderDict(foo='bar') |
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220 >>> headers.add('Foo', 'baz') |
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221 >>> headers['foo'] |
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222 'bar, baz' |
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223 """ |
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224 key_lower = key.lower() |
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225 new_vals = [key, val] |
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226 # Keep the common case aka no item present as fast as possible |
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227 vals = self._container.setdefault(key_lower, new_vals) |
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228 if new_vals is not vals: |
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229 vals.append(val) |
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230 |
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231 def extend(self, *args, **kwargs): |
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232 """Generic import function for any type of header-like object. |
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233 Adapted version of MutableMapping.update in order to insert items |
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234 with self.add instead of self.__setitem__ |
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235 """ |
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236 if len(args) > 1: |
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237 raise TypeError( |
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238 "extend() takes at most 1 positional " |
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239 "arguments ({0} given)".format(len(args)) |
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240 ) |
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241 other = args[0] if len(args) >= 1 else () |
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242 |
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243 if isinstance(other, HTTPHeaderDict): |
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244 for key, val in other.iteritems(): |
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245 self.add(key, val) |
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246 elif isinstance(other, Mapping): |
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247 for key in other: |
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248 self.add(key, other[key]) |
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249 elif hasattr(other, "keys"): |
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250 for key in other.keys(): |
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251 self.add(key, other[key]) |
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252 else: |
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253 for key, value in other: |
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254 self.add(key, value) |
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255 |
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256 for key, value in kwargs.items(): |
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257 self.add(key, value) |
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258 |
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259 def getlist(self, key, default=__marker): |
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260 """Returns a list of all the values for the named field. Returns an |
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261 empty list if the key doesn't exist.""" |
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262 try: |
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263 vals = self._container[key.lower()] |
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264 except KeyError: |
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265 if default is self.__marker: |
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266 return [] |
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267 return default |
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268 else: |
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269 return vals[1:] |
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270 |
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271 # Backwards compatibility for httplib |
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272 getheaders = getlist |
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273 getallmatchingheaders = getlist |
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274 iget = getlist |
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275 |
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276 # Backwards compatibility for http.cookiejar |
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277 get_all = getlist |
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278 |
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279 def __repr__(self): |
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280 return "%s(%s)" % (type(self).__name__, dict(self.itermerged())) |
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281 |
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282 def _copy_from(self, other): |
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283 for key in other: |
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284 val = other.getlist(key) |
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285 if isinstance(val, list): |
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286 # Don't need to convert tuples |
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287 val = list(val) |
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288 self._container[key.lower()] = [key] + val |
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289 |
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290 def copy(self): |
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291 clone = type(self)() |
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292 clone._copy_from(self) |
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293 return clone |
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294 |
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295 def iteritems(self): |
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296 """Iterate over all header lines, including duplicate ones.""" |
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297 for key in self: |
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298 vals = self._container[key.lower()] |
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299 for val in vals[1:]: |
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300 yield vals[0], val |
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301 |
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302 def itermerged(self): |
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303 """Iterate over all headers, merging duplicate ones together.""" |
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304 for key in self: |
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305 val = self._container[key.lower()] |
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306 yield val[0], ", ".join(val[1:]) |
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307 |
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308 def items(self): |
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309 return list(self.iteritems()) |
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310 |
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311 @classmethod |
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312 def from_httplib(cls, message): # Python 2 |
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313 """Read headers from a Python 2 httplib message object.""" |
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314 # python2.7 does not expose a proper API for exporting multiheaders |
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315 # efficiently. This function re-reads raw lines from the message |
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316 # object and extracts the multiheaders properly. |
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317 obs_fold_continued_leaders = (" ", "\t") |
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318 headers = [] |
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319 |
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320 for line in message.headers: |
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321 if line.startswith(obs_fold_continued_leaders): |
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322 if not headers: |
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323 # We received a header line that starts with OWS as described |
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324 # in RFC-7230 S3.2.4. This indicates a multiline header, but |
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325 # there exists no previous header to which we can attach it. |
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326 raise InvalidHeader( |
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327 "Header continuation with no previous header: %s" % line |
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328 ) |
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329 else: |
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330 key, value = headers[-1] |
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331 headers[-1] = (key, value + " " + line.strip()) |
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332 continue |
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333 |
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334 key, value = line.split(":", 1) |
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335 headers.append((key, value.strip())) |
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336 |
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337 return cls(headers) |