Mercurial > repos > shellac > guppy_basecaller

annotate env/lib/python3.7/site-packages/urllib3/_collections.py @ 4:79f47841a781 draft

Find changesets by keywords (author, files, the commit message), revision number or hash, or revset expression.
"planemo upload commit 2a0fe2cc28b09e101d37293e53e82f61762262ec"
author shellac
date Thu, 14 May 2020 16:47:39 -0400
parents 26e78fe6e8c4
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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0
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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 from .exceptions import InvalidHeader
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21 from .packages.six import iterkeys, itervalues, PY3
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22
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23
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24 __all__ = ["RecentlyUsedContainer", "HTTPHeaderDict"]
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25
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26
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27 _Null = object()
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28
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29
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30 class RecentlyUsedContainer(MutableMapping):
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31 """
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32 Provides a thread-safe dict-like container which maintains up to
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33 ``maxsize`` keys while throwing away the least-recently-used keys beyond
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34 ``maxsize``.
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35
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36 :param maxsize:
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37 Maximum number of recent elements to retain.
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38
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39 :param dispose_func:
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40 Every time an item is evicted from the container,
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41 ``dispose_func(value)`` is called. Callback which will get called
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42 """
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43
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44 ContainerCls = OrderedDict
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45
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46 def __init__(self, maxsize=10, dispose_func=None):
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47 self._maxsize = maxsize
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48 self.dispose_func = dispose_func
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49
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50 self._container = self.ContainerCls()
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51 self.lock = RLock()
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52
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53 def __getitem__(self, key):
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54 # Re-insert the item, moving it to the end of the eviction line.
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55 with self.lock:
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56 item = self._container.pop(key)
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57 self._container[key] = item
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58 return item
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59
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60 def __setitem__(self, key, value):
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61 evicted_value = _Null
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62 with self.lock:
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63 # Possibly evict the existing value of 'key'
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64 evicted_value = self._container.get(key, _Null)
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65 self._container[key] = value
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66
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67 # If we didn't evict an existing value, we might have to evict the
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68 # least recently used item from the beginning of the container.
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69 if len(self._container) > self._maxsize:
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70 _key, evicted_value = self._container.popitem(last=False)
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71
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72 if self.dispose_func and evicted_value is not _Null:
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73 self.dispose_func(evicted_value)
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74
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75 def __delitem__(self, key):
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76 with self.lock:
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77 value = self._container.pop(key)
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78
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79 if self.dispose_func:
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80 self.dispose_func(value)
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81
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82 def __len__(self):
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83 with self.lock:
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84 return len(self._container)
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85
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86 def __iter__(self):
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87 raise NotImplementedError(
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88 "Iteration over this class is unlikely to be threadsafe."
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89 )
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90
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91 def clear(self):
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92 with self.lock:
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93 # Copy pointers to all values, then wipe the mapping
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94 values = list(itervalues(self._container))
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95 self._container.clear()
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96
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97 if self.dispose_func:
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98 for value in values:
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99 self.dispose_func(value)
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100
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101 def keys(self):
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102 with self.lock:
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103 return list(iterkeys(self._container))
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104
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105
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106 class HTTPHeaderDict(MutableMapping):
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107 """
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108 :param headers:
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109 An iterable of field-value pairs. Must not contain multiple field names
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110 when compared case-insensitively.
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111
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112 :param kwargs:
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113 Additional field-value pairs to pass in to ``dict.update``.
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114
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115 A ``dict`` like container for storing HTTP Headers.
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116
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117 Field names are stored and compared case-insensitively in compliance with
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118 RFC 7230. Iteration provides the first case-sensitive key seen for each
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119 case-insensitive pair.
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120
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121 Using ``__setitem__`` syntax overwrites fields that compare equal
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122 case-insensitively in order to maintain ``dict``'s api. For fields that
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123 compare equal, instead create a new ``HTTPHeaderDict`` and use ``.add``
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124 in a loop.
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125
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126 If multiple fields that are equal case-insensitively are passed to the
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127 constructor or ``.update``, the behavior is undefined and some will be
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128 lost.
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129
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130 >>> headers = HTTPHeaderDict()
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131 >>> headers.add('Set-Cookie', 'foo=bar')
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132 >>> headers.add('set-cookie', 'baz=quxx')
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133 >>> headers['content-length'] = '7'
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134 >>> headers['SET-cookie']
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135 'foo=bar, baz=quxx'
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136 >>> headers['Content-Length']
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137 '7'
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138 """
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139
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140 def __init__(self, headers=None, **kwargs):
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141 super(HTTPHeaderDict, self).__init__()
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142 self._container = OrderedDict()
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143 if headers is not None:
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144 if isinstance(headers, HTTPHeaderDict):
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145 self._copy_from(headers)
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146 else:
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147 self.extend(headers)
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148 if kwargs:
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149 self.extend(kwargs)
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150
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151 def __setitem__(self, key, val):
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152 self._container[key.lower()] = [key, val]
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153 return self._container[key.lower()]
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154
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155 def __getitem__(self, key):
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156 val = self._container[key.lower()]
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157 return ", ".join(val[1:])
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158
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159 def __delitem__(self, key):
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160 del self._container[key.lower()]
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161
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162 def __contains__(self, key):
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163 return key.lower() in self._container
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164
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165 def __eq__(self, other):
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166 if not isinstance(other, Mapping) and not hasattr(other, "keys"):
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167 return False
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168 if not isinstance(other, type(self)):
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169 other = type(self)(other)
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170 return dict((k.lower(), v) for k, v in self.itermerged()) == dict(
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171 (k.lower(), v) for k, v in other.itermerged()
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172 )
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173
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174 def __ne__(self, other):
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175 return not self.__eq__(other)
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176
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177 if not PY3: # Python 2
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178 iterkeys = MutableMapping.iterkeys
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179 itervalues = MutableMapping.itervalues
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180
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181 __marker = object()
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182
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183 def __len__(self):
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184 return len(self._container)
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185
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186 def __iter__(self):
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187 # Only provide the originally cased names
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188 for vals in self._container.values():
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189 yield vals[0]
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190
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191 def pop(self, key, default=__marker):
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192 """D.pop(k[,d]) -> v, remove specified key and return the corresponding value.
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193 If key is not found, d is returned if given, otherwise KeyError is raised.
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194 """
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195 # Using the MutableMapping function directly fails due to the private marker.
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196 # Using ordinary dict.pop would expose the internal structures.
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197 # So let's reinvent the wheel.
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198 try:
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199 value = self[key]
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200 except KeyError:
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201 if default is self.__marker:
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202 raise
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203 return default
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204 else:
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205 del self[key]
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206 return value
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207
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208 def discard(self, key):
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209 try:
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210 del self[key]
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211 except KeyError:
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212 pass
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213
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214 def add(self, key, val):
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215 """Adds a (name, value) pair, doesn't overwrite the value if it already
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216 exists.
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217
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218 >>> headers = HTTPHeaderDict(foo='bar')
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219 >>> headers.add('Foo', 'baz')
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220 >>> headers['foo']
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221 'bar, baz'
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222 """
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223 key_lower = key.lower()
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224 new_vals = [key, val]
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225 # Keep the common case aka no item present as fast as possible
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226 vals = self._container.setdefault(key_lower, new_vals)
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227 if new_vals is not vals:
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228 vals.append(val)
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229
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230 def extend(self, *args, **kwargs):
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231 """Generic import function for any type of header-like object.
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232 Adapted version of MutableMapping.update in order to insert items
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233 with self.add instead of self.__setitem__
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234 """
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235 if len(args) > 1:
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236 raise TypeError(
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237 "extend() takes at most 1 positional "
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238 "arguments ({0} given)".format(len(args))
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239 )
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240 other = args[0] if len(args) >= 1 else ()
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241
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242 if isinstance(other, HTTPHeaderDict):
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243 for key, val in other.iteritems():
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244 self.add(key, val)
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245 elif isinstance(other, Mapping):
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246 for key in other:
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247 self.add(key, other[key])
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248 elif hasattr(other, "keys"):
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249 for key in other.keys():
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250 self.add(key, other[key])
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251 else:
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252 for key, value in other:
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253 self.add(key, value)
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254
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255 for key, value in kwargs.items():
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256 self.add(key, value)
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257
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258 def getlist(self, key, default=__marker):
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259 """Returns a list of all the values for the named field. Returns an
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260 empty list if the key doesn't exist."""
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261 try:
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262 vals = self._container[key.lower()]
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263 except KeyError:
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264 if default is self.__marker:
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265 return []
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266 return default
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267 else:
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268 return vals[1:]
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269
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270 # Backwards compatibility for httplib
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271 getheaders = getlist
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272 getallmatchingheaders = getlist
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273 iget = getlist
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274
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275 # Backwards compatibility for http.cookiejar
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276 get_all = getlist
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277
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278 def __repr__(self):
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279 return "%s(%s)" % (type(self).__name__, dict(self.itermerged()))
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280
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281 def _copy_from(self, other):
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282 for key in other:
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283 val = other.getlist(key)
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284 if isinstance(val, list):
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285 # Don't need to convert tuples
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286 val = list(val)
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287 self._container[key.lower()] = [key] + val
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288
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289 def copy(self):
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290 clone = type(self)()
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291 clone._copy_from(self)
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292 return clone
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293
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294 def iteritems(self):
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295 """Iterate over all header lines, including duplicate ones."""
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296 for key in self:
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297 vals = self._container[key.lower()]
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298 for val in vals[1:]:
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299 yield vals[0], val
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300
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301 def itermerged(self):
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302 """Iterate over all headers, merging duplicate ones together."""
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303 for key in self:
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304 val = self._container[key.lower()]
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305 yield val[0], ", ".join(val[1:])
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306
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307 def items(self):
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308 return list(self.iteritems())
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309
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310 @classmethod
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311 def from_httplib(cls, message): # Python 2
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312 """Read headers from a Python 2 httplib message object."""
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313 # python2.7 does not expose a proper API for exporting multiheaders
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314 # efficiently. This function re-reads raw lines from the message
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315 # object and extracts the multiheaders properly.
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316 obs_fold_continued_leaders = (" ", "\t")
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317 headers = []
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318
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319 for line in message.headers:
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320 if line.startswith(obs_fold_continued_leaders):
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321 if not headers:
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322 # We received a header line that starts with OWS as described
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323 # in RFC-7230 S3.2.4. This indicates a multiline header, but
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324 # there exists no previous header to which we can attach it.
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325 raise InvalidHeader(
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326 "Header continuation with no previous header: %s" % line
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327 )
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328 else:
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329 key, value = headers[-1]
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330 headers[-1] = (key, value + " " + line.strip())
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331 continue
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332
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333 key, value = line.split(":", 1)
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334 headers.append((key, value.strip()))
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335
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336 return cls(headers)