Mercurial > repos > guerler > springsuite

annotate planemo/lib/python3.7/site-packages/psutil/_compat.py @ 1:56ad4e20f292 draft

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"planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
author guerler
date Fri, 31 Jul 2020 00:32:28 -0400
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1
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1 # Copyright (c) 2009, Giampaolo Rodola'. All rights reserved.
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2 # Use of this source code is governed by a BSD-style license that can be
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3 # found in the LICENSE file.
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4
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5 """Module which provides compatibility with older Python versions.
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6 This is more future-compatible rather than the opposite (prefer latest
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7 Python 3 way of doing things).
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8 """
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9
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10 import collections
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11 import errno
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12 import functools
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13 import os
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14 import sys
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15 import types
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16
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17 __all__ = [
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18 # constants
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19 "PY3",
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20 # builtins
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21 "long", "range", "super", "unicode", "basestring",
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22 # literals
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23 "u", "b",
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24 # collections module
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25 "lru_cache",
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26 # shutil module
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27 "which", "get_terminal_size",
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28 # python 3 exceptions
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29 "FileNotFoundError", "PermissionError", "ProcessLookupError",
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30 "InterruptedError", "ChildProcessError", "FileExistsError"]
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31
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32
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33 PY3 = sys.version_info[0] == 3
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34 _SENTINEL = object()
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35
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36 if PY3:
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37 long = int
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38 xrange = range
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39 unicode = str
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40 basestring = str
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41 range = range
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42
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43 def u(s):
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44 return s
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45
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46 def b(s):
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47 return s.encode("latin-1")
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48 else:
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49 long = long
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50 range = xrange
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51 unicode = unicode
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52 basestring = basestring
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53
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54 def u(s):
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55 return unicode(s, "unicode_escape")
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56
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57 def b(s):
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58 return s
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59
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60
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61 # --- builtins
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62
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63
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64 # Python 3 super().
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65 # Taken from "future" package.
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66 # Credit: Ryan Kelly
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67 if PY3:
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68 super = super
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69 else:
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70 _builtin_super = super
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71
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72 def super(type_=_SENTINEL, type_or_obj=_SENTINEL, framedepth=1):
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73 """Like Python 3 builtin super(). If called without any arguments
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74 it attempts to infer them at runtime.
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75 """
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76 if type_ is _SENTINEL:
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77 f = sys._getframe(framedepth)
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78 try:
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79 # Get the function's first positional argument.
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80 type_or_obj = f.f_locals[f.f_code.co_varnames[0]]
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81 except (IndexError, KeyError):
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82 raise RuntimeError('super() used in a function with no args')
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83 try:
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84 # Get the MRO so we can crawl it.
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85 mro = type_or_obj.__mro__
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86 except (AttributeError, RuntimeError):
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87 try:
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88 mro = type_or_obj.__class__.__mro__
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89 except AttributeError:
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90 raise RuntimeError('super() used in a non-newstyle class')
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91 for type_ in mro:
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92 # Find the class that owns the currently-executing method.
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93 for meth in type_.__dict__.values():
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94 # Drill down through any wrappers to the underlying func.
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95 # This handles e.g. classmethod() and staticmethod().
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96 try:
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97 while not isinstance(meth, types.FunctionType):
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98 if isinstance(meth, property):
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99 # Calling __get__ on the property will invoke
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100 # user code which might throw exceptions or
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101 # have side effects
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102 meth = meth.fget
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103 else:
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104 try:
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105 meth = meth.__func__
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106 except AttributeError:
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107 meth = meth.__get__(type_or_obj, type_)
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108 except (AttributeError, TypeError):
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109 continue
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110 if meth.func_code is f.f_code:
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111 break # found
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112 else:
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113 # Not found. Move onto the next class in MRO.
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114 continue
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115 break # found
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116 else:
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117 raise RuntimeError('super() called outside a method')
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118
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119 # Dispatch to builtin super().
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120 if type_or_obj is not _SENTINEL:
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121 return _builtin_super(type_, type_or_obj)
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122 return _builtin_super(type_)
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123
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124
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125 # --- exceptions
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126
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127
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128 if PY3:
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129 FileNotFoundError = FileNotFoundError # NOQA
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130 PermissionError = PermissionError # NOQA
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131 ProcessLookupError = ProcessLookupError # NOQA
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132 InterruptedError = InterruptedError # NOQA
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133 ChildProcessError = ChildProcessError # NOQA
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134 FileExistsError = FileExistsError # NOQA
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135 else:
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136 # https://github.com/PythonCharmers/python-future/blob/exceptions/
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137 # src/future/types/exceptions/pep3151.py
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138 import platform
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139
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140 def _instance_checking_exception(base_exception=Exception):
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141 def wrapped(instance_checker):
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142 class TemporaryClass(base_exception):
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143
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144 def __init__(self, *args, **kwargs):
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145 if len(args) == 1 and isinstance(args[0], TemporaryClass):
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146 unwrap_me = args[0]
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147 for attr in dir(unwrap_me):
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148 if not attr.startswith('__'):
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149 setattr(self, attr, getattr(unwrap_me, attr))
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150 else:
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151 super(TemporaryClass, self).__init__(*args, **kwargs)
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152
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153 class __metaclass__(type):
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154 def __instancecheck__(cls, inst):
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155 return instance_checker(inst)
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156
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157 def __subclasscheck__(cls, classinfo):
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158 value = sys.exc_info()[1]
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159 return isinstance(value, cls)
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160
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161 TemporaryClass.__name__ = instance_checker.__name__
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162 TemporaryClass.__doc__ = instance_checker.__doc__
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163 return TemporaryClass
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164
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165 return wrapped
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166
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167 @_instance_checking_exception(EnvironmentError)
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168 def FileNotFoundError(inst):
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169 return getattr(inst, 'errno', _SENTINEL) == errno.ENOENT
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170
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171 @_instance_checking_exception(EnvironmentError)
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172 def ProcessLookupError(inst):
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173 return getattr(inst, 'errno', _SENTINEL) == errno.ESRCH
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174
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175 @_instance_checking_exception(EnvironmentError)
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176 def PermissionError(inst):
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177 return getattr(inst, 'errno', _SENTINEL) in (
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178 errno.EACCES, errno.EPERM)
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179
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180 @_instance_checking_exception(EnvironmentError)
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181 def InterruptedError(inst):
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182 return getattr(inst, 'errno', _SENTINEL) == errno.EINTR
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183
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184 @_instance_checking_exception(EnvironmentError)
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185 def ChildProcessError(inst):
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186 return getattr(inst, 'errno', _SENTINEL) == errno.ECHILD
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187
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188 @_instance_checking_exception(EnvironmentError)
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189 def FileExistsError(inst):
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190 return getattr(inst, 'errno', _SENTINEL) == errno.EEXIST
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191
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192 if platform.python_implementation() != "CPython":
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193 try:
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194 raise OSError(errno.EEXIST, "perm")
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195 except FileExistsError:
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196 pass
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197 except OSError:
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198 raise RuntimeError(
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199 "broken or incompatible Python implementation, see: "
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200 "https://github.com/giampaolo/psutil/issues/1659")
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201
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202
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203 # --- stdlib additions
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204
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205
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206 # py 3.2 functools.lru_cache
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207 # Taken from: http://code.activestate.com/recipes/578078
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208 # Credit: Raymond Hettinger
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209 try:
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210 from functools import lru_cache
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211 except ImportError:
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212 try:
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213 from threading import RLock
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214 except ImportError:
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215 from dummy_threading import RLock
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216
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217 _CacheInfo = collections.namedtuple(
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218 "CacheInfo", ["hits", "misses", "maxsize", "currsize"])
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219
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220 class _HashedSeq(list):
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221 __slots__ = 'hashvalue'
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222
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223 def __init__(self, tup, hash=hash):
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224 self[:] = tup
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225 self.hashvalue = hash(tup)
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226
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227 def __hash__(self):
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228 return self.hashvalue
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229
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230 def _make_key(args, kwds, typed,
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231 kwd_mark=(object(), ),
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232 fasttypes=set((int, str, frozenset, type(None))),
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233 sorted=sorted, tuple=tuple, type=type, len=len):
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234 key = args
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235 if kwds:
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236 sorted_items = sorted(kwds.items())
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237 key += kwd_mark
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238 for item in sorted_items:
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239 key += item
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240 if typed:
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241 key += tuple(type(v) for v in args)
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242 if kwds:
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243 key += tuple(type(v) for k, v in sorted_items)
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244 elif len(key) == 1 and type(key[0]) in fasttypes:
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245 return key[0]
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246 return _HashedSeq(key)
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247
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248 def lru_cache(maxsize=100, typed=False):
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249 """Least-recently-used cache decorator, see:
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250 http://docs.python.org/3/library/functools.html#functools.lru_cache
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251 """
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252 def decorating_function(user_function):
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253 cache = dict()
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254 stats = [0, 0]
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255 HITS, MISSES = 0, 1
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256 make_key = _make_key
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257 cache_get = cache.get
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258 _len = len
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259 lock = RLock()
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260 root = []
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diff changeset
261 root[:] = [root, root, None, None]
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parents:
diff changeset
262 nonlocal_root = [root]
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diff changeset
263 PREV, NEXT, KEY, RESULT = 0, 1, 2, 3
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
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parents:
diff changeset
264 if maxsize == 0:
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parents:
diff changeset
265 def wrapper(*args, **kwds):
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266 result = user_function(*args, **kwds)
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parents:
diff changeset
267 stats[MISSES] += 1
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parents:
diff changeset
268 return result
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
269 elif maxsize is None:
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parents:
diff changeset
270 def wrapper(*args, **kwds):
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diff changeset
271 key = make_key(args, kwds, typed)
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272 result = cache_get(key, root)
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guerler
parents:
diff changeset
273 if result is not root:
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diff changeset
274 stats[HITS] += 1
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diff changeset
275 return result
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276 result = user_function(*args, **kwds)
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277 cache[key] = result
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278 stats[MISSES] += 1
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279 return result
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diff changeset
280 else:
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diff changeset
281 def wrapper(*args, **kwds):
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282 if kwds or typed:
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283 key = make_key(args, kwds, typed)
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284 else:
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285 key = args
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286 lock.acquire()
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287 try:
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288 link = cache_get(key)
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289 if link is not None:
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290 root, = nonlocal_root
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291 link_prev, link_next, key, result = link
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292 link_prev[NEXT] = link_next
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293 link_next[PREV] = link_prev
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294 last = root[PREV]
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295 last[NEXT] = root[PREV] = link
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296 link[PREV] = last
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297 link[NEXT] = root
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298 stats[HITS] += 1
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299 return result
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300 finally:
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301 lock.release()
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302 result = user_function(*args, **kwds)
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303 lock.acquire()
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304 try:
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305 root, = nonlocal_root
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306 if key in cache:
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307 pass
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
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308 elif _len(cache) >= maxsize:
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
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309 oldroot = root
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310 oldroot[KEY] = key
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311 oldroot[RESULT] = result
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312 root = nonlocal_root[0] = oldroot[NEXT]
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313 oldkey = root[KEY]
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314 root[KEY] = root[RESULT] = None
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315 del cache[oldkey]
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316 cache[key] = oldroot
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
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317 else:
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318 last = root[PREV]
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319 link = [last, root, key, result]
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320 last[NEXT] = root[PREV] = cache[key] = link
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321 stats[MISSES] += 1
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
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diff changeset
322 finally:
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
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323 lock.release()
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324 return result
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325
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326 def cache_info():
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327 """Report cache statistics"""
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
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diff changeset
328 lock.acquire()
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
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diff changeset
329 try:
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330 return _CacheInfo(stats[HITS], stats[MISSES], maxsize,
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331 len(cache))
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
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diff changeset
332 finally:
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
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333 lock.release()
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
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diff changeset
334
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diff changeset
335 def cache_clear():
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
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diff changeset
336 """Clear the cache and cache statistics"""
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
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337 lock.acquire()
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
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diff changeset
338 try:
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339 cache.clear()
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340 root = nonlocal_root[0]
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diff changeset
341 root[:] = [root, root, None, None]
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diff changeset
342 stats[:] = [0, 0]
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
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diff changeset
343 finally:
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344 lock.release()
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
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diff changeset
345
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346 wrapper.__wrapped__ = user_function
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
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347 wrapper.cache_info = cache_info
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
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348 wrapper.cache_clear = cache_clear
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349 return functools.update_wrapper(wrapper, user_function)
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diff changeset
350
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351 return decorating_function
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352
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353
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
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354 # python 3.3
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diff changeset
355 try:
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
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356 from shutil import which
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
357 except ImportError:
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
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parents:
diff changeset
358 def which(cmd, mode=os.F_OK | os.X_OK, path=None):
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
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359 """Given a command, mode, and a PATH string, return the path which
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
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diff changeset
360 conforms to the given mode on the PATH, or None if there is no such
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
361 file.
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
362
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
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parents:
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363 `mode` defaults to os.F_OK | os.X_OK. `path` defaults to the result
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
364 of os.environ.get("PATH"), or can be overridden with a custom search
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
365 path.
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
366 """
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
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parents:
diff changeset
367 def _access_check(fn, mode):
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
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parents:
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368 return (os.path.exists(fn) and os.access(fn, mode) and
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
369 not os.path.isdir(fn))
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diff changeset
370
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
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parents:
diff changeset
371 if os.path.dirname(cmd):
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
372 if _access_check(cmd, mode):
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
373 return cmd
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
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374 return None
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guerler
parents:
diff changeset
375
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
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376 if path is None:
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
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parents:
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377 path = os.environ.get("PATH", os.defpath)
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
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378 if not path:
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
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diff changeset
379 return None
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
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diff changeset
380 path = path.split(os.pathsep)
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diff changeset
381
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
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parents:
diff changeset
382 if sys.platform == "win32":
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
383 if os.curdir not in path:
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
384 path.insert(0, os.curdir)
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
385
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386 pathext = os.environ.get("PATHEXT", "").split(os.pathsep)
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
387 if any(cmd.lower().endswith(ext.lower()) for ext in pathext):
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
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388 files = [cmd]
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
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diff changeset
389 else:
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
390 files = [cmd + ext for ext in pathext]
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
391 else:
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
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392 files = [cmd]
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393
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394 seen = set()
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395 for dir in path:
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396 normdir = os.path.normcase(dir)
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397 if normdir not in seen:
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398 seen.add(normdir)
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399 for thefile in files:
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400 name = os.path.join(dir, thefile)
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401 if _access_check(name, mode):
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402 return name
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403 return None
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404
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405
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406 # python 3.3
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407 try:
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408 from shutil import get_terminal_size
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409 except ImportError:
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410 def get_terminal_size(fallback=(80, 24)):
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411 try:
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412 import fcntl
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413 import termios
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414 import struct
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415 except ImportError:
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416 return fallback
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417 else:
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418 try:
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419 # This should work on Linux.
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420 res = struct.unpack(
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421 'hh', fcntl.ioctl(1, termios.TIOCGWINSZ, '1234'))
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422 return (res[1], res[0])
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423 except Exception:
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424 return fallback