Mercurial > repos > shellac > guppy_basecaller

annotate env/lib/python3.7/site-packages/filelock.py @ 0:26e78fe6e8c4 draft

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"planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
author shellac
date Sat, 02 May 2020 07:14:21 -0400
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1 # This is free and unencumbered software released into the public domain.
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2 #
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3 # Anyone is free to copy, modify, publish, use, compile, sell, or
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4 # distribute this software, either in source code form or as a compiled
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5 # binary, for any purpose, commercial or non-commercial, and by any
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6 # means.
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7 #
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8 # In jurisdictions that recognize copyright laws, the author or authors
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9 # of this software dedicate any and all copyright interest in the
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10 # software to the public domain. We make this dedication for the benefit
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11 # of the public at large and to the detriment of our heirs and
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12 # successors. We intend this dedication to be an overt act of
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13 # relinquishment in perpetuity of all present and future rights to this
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14 # software under copyright law.
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15 #
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16 # THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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17 # EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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18 # MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
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19 # IN NO EVENT SHALL THE AUTHORS BE LIABLE FOR ANY CLAIM, DAMAGES OR
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20 # OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
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21 # ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
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22 # OTHER DEALINGS IN THE SOFTWARE.
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23 #
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24 # For more information, please refer to <http://unlicense.org>
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25
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26 """
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27 A platform independent file lock that supports the with-statement.
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28 """
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29
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30
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31 # Modules
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32 # ------------------------------------------------
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33 import logging
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34 import os
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35 import threading
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36 import time
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37 try:
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38 import warnings
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39 except ImportError:
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40 warnings = None
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41
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42 try:
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43 import msvcrt
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44 except ImportError:
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45 msvcrt = None
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46
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47 try:
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48 import fcntl
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49 except ImportError:
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50 fcntl = None
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51
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52
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53 # Backward compatibility
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54 # ------------------------------------------------
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55 try:
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56 TimeoutError
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57 except NameError:
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58 TimeoutError = OSError
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59
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60
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61 # Data
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62 # ------------------------------------------------
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63 __all__ = [
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64 "Timeout",
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65 "BaseFileLock",
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66 "WindowsFileLock",
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67 "UnixFileLock",
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68 "SoftFileLock",
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69 "FileLock"
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70 ]
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71
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72 __version__ = "3.0.12"
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73
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74
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75 _logger = None
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76 def logger():
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77 """Returns the logger instance used in this module."""
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78 global _logger
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79 _logger = _logger or logging.getLogger(__name__)
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80 return _logger
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81
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82
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83 # Exceptions
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84 # ------------------------------------------------
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85 class Timeout(TimeoutError):
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86 """
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87 Raised when the lock could not be acquired in *timeout*
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88 seconds.
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89 """
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90
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91 def __init__(self, lock_file):
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92 """
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93 """
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94 #: The path of the file lock.
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95 self.lock_file = lock_file
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96 return None
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97
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98 def __str__(self):
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99 temp = "The file lock '{}' could not be acquired."\
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100 .format(self.lock_file)
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101 return temp
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102
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103
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104 # Classes
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105 # ------------------------------------------------
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106
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107 # This is a helper class which is returned by :meth:`BaseFileLock.acquire`
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108 # and wraps the lock to make sure __enter__ is not called twice when entering
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109 # the with statement.
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110 # If we would simply return *self*, the lock would be acquired again
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111 # in the *__enter__* method of the BaseFileLock, but not released again
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112 # automatically.
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113 #
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114 # :seealso: issue #37 (memory leak)
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115 class _Acquire_ReturnProxy(object):
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116
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117 def __init__(self, lock):
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118 self.lock = lock
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119 return None
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120
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121 def __enter__(self):
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122 return self.lock
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123
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124 def __exit__(self, exc_type, exc_value, traceback):
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125 self.lock.release()
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126 return None
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127
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128
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129 class BaseFileLock(object):
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130 """
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131 Implements the base class of a file lock.
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132 """
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133
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134 def __init__(self, lock_file, timeout = -1):
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135 """
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136 """
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137 # The path to the lock file.
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138 self._lock_file = lock_file
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139
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140 # The file descriptor for the *_lock_file* as it is returned by the
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141 # os.open() function.
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142 # This file lock is only NOT None, if the object currently holds the
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143 # lock.
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144 self._lock_file_fd = None
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145
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146 # The default timeout value.
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147 self.timeout = timeout
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148
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149 # We use this lock primarily for the lock counter.
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150 self._thread_lock = threading.Lock()
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151
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152 # The lock counter is used for implementing the nested locking
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153 # mechanism. Whenever the lock is acquired, the counter is increased and
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154 # the lock is only released, when this value is 0 again.
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155 self._lock_counter = 0
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156 return None
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157
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158 @property
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159 def lock_file(self):
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160 """
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161 The path to the lock file.
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162 """
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163 return self._lock_file
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164
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165 @property
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166 def timeout(self):
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167 """
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168 You can set a default timeout for the filelock. It will be used as
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169 fallback value in the acquire method, if no timeout value (*None*) is
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170 given.
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171
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172 If you want to disable the timeout, set it to a negative value.
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173
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174 A timeout of 0 means, that there is exactly one attempt to acquire the
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175 file lock.
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176
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177 .. versionadded:: 2.0.0
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178 """
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179 return self._timeout
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180
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181 @timeout.setter
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182 def timeout(self, value):
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183 """
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184 """
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185 self._timeout = float(value)
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186 return None
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187
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188 # Platform dependent locking
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189 # --------------------------------------------
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190
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191 def _acquire(self):
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192 """
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193 Platform dependent. If the file lock could be
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194 acquired, self._lock_file_fd holds the file descriptor
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195 of the lock file.
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196 """
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197 raise NotImplementedError()
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198
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199 def _release(self):
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200 """
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201 Releases the lock and sets self._lock_file_fd to None.
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202 """
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203 raise NotImplementedError()
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204
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205 # Platform independent methods
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206 # --------------------------------------------
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207
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208 @property
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209 def is_locked(self):
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210 """
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211 True, if the object holds the file lock.
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212
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213 .. versionchanged:: 2.0.0
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214
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215 This was previously a method and is now a property.
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216 """
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217 return self._lock_file_fd is not None
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218
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219 def acquire(self, timeout=None, poll_intervall=0.05):
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220 """
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221 Acquires the file lock or fails with a :exc:`Timeout` error.
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222
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223 .. code-block:: python
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224
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225 # You can use this method in the context manager (recommended)
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226 with lock.acquire():
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227 pass
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228
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229 # Or use an equivalent try-finally construct:
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230 lock.acquire()
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231 try:
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232 pass
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233 finally:
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234 lock.release()
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235
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236 :arg float timeout:
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237 The maximum time waited for the file lock.
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238 If ``timeout < 0``, there is no timeout and this method will
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239 block until the lock could be acquired.
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240 If ``timeout`` is None, the default :attr:`~timeout` is used.
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241
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242 :arg float poll_intervall:
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243 We check once in *poll_intervall* seconds if we can acquire the
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244 file lock.
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245
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246 :raises Timeout:
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247 if the lock could not be acquired in *timeout* seconds.
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248
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249 .. versionchanged:: 2.0.0
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250
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251 This method returns now a *proxy* object instead of *self*,
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252 so that it can be used in a with statement without side effects.
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253 """
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254 # Use the default timeout, if no timeout is provided.
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255 if timeout is None:
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256 timeout = self.timeout
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257
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258 # Increment the number right at the beginning.
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259 # We can still undo it, if something fails.
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260 with self._thread_lock:
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261 self._lock_counter += 1
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262
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263 lock_id = id(self)
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264 lock_filename = self._lock_file
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265 start_time = time.time()
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266 try:
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267 while True:
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diff changeset
268 with self._thread_lock:
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diff changeset
269 if not self.is_locked:
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270 logger().debug('Attempting to acquire lock %s on %s', lock_id, lock_filename)
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diff changeset
271 self._acquire()
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272
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diff changeset
273 if self.is_locked:
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diff changeset
274 logger().info('Lock %s acquired on %s', lock_id, lock_filename)
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diff changeset
275 break
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diff changeset
276 elif timeout >= 0 and time.time() - start_time > timeout:
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diff changeset
277 logger().debug('Timeout on acquiring lock %s on %s', lock_id, lock_filename)
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diff changeset
278 raise Timeout(self._lock_file)
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diff changeset
279 else:
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diff changeset
280 logger().debug(
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
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diff changeset
281 'Lock %s not acquired on %s, waiting %s seconds ...',
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diff changeset
282 lock_id, lock_filename, poll_intervall
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diff changeset
283 )
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284 time.sleep(poll_intervall)
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285 except:
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286 # Something did go wrong, so decrement the counter.
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diff changeset
287 with self._thread_lock:
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288 self._lock_counter = max(0, self._lock_counter - 1)
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289
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290 raise
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291 return _Acquire_ReturnProxy(lock = self)
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292
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293 def release(self, force = False):
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294 """
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295 Releases the file lock.
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296
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diff changeset
297 Please note, that the lock is only completly released, if the lock
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298 counter is 0.
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299
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diff changeset
300 Also note, that the lock file itself is not automatically deleted.
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301
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302 :arg bool force:
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303 If true, the lock counter is ignored and the lock is released in
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diff changeset
304 every case.
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305 """
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parents:
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306 with self._thread_lock:
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307
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
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308 if self.is_locked:
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diff changeset
309 self._lock_counter -= 1
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310
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parents:
diff changeset
311 if self._lock_counter == 0 or force:
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parents:
diff changeset
312 lock_id = id(self)
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
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313 lock_filename = self._lock_file
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
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314
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diff changeset
315 logger().debug('Attempting to release lock %s on %s', lock_id, lock_filename)
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
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parents:
diff changeset
316 self._release()
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317 self._lock_counter = 0
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
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diff changeset
318 logger().info('Lock %s released on %s', lock_id, lock_filename)
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319
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diff changeset
320 return None
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
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321
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
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322 def __enter__(self):
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323 self.acquire()
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
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diff changeset
324 return self
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
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325
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
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parents:
diff changeset
326 def __exit__(self, exc_type, exc_value, traceback):
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parents:
diff changeset
327 self.release()
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diff changeset
328 return None
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parents:
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329
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diff changeset
330 def __del__(self):
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
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diff changeset
331 self.release(force = True)
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diff changeset
332 return None
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
333
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
334
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
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parents:
diff changeset
335 # Windows locking mechanism
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
336 # ~~~~~~~~~~~~~~~~~~~~~~~~~
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diff changeset
337
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
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parents:
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338 class WindowsFileLock(BaseFileLock):
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
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parents:
diff changeset
339 """
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
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parents:
diff changeset
340 Uses the :func:`msvcrt.locking` function to hard lock the lock file on
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
341 windows systems.
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
342 """
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
343
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
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parents:
diff changeset
344 def _acquire(self):
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parents:
diff changeset
345 open_mode = os.O_RDWR | os.O_CREAT | os.O_TRUNC
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parents:
diff changeset
346
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
347 try:
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
348 fd = os.open(self._lock_file, open_mode)
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
349 except OSError:
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
350 pass
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
351 else:
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
352 try:
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
353 msvcrt.locking(fd, msvcrt.LK_NBLCK, 1)
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
354 except (IOError, OSError):
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
355 os.close(fd)
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
356 else:
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
357 self._lock_file_fd = fd
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
358 return None
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
359
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
360 def _release(self):
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
361 fd = self._lock_file_fd
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
362 self._lock_file_fd = None
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
363 msvcrt.locking(fd, msvcrt.LK_UNLCK, 1)
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
364 os.close(fd)
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
365
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
366 try:
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
367 os.remove(self._lock_file)
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
368 # Probably another instance of the application
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
369 # that acquired the file lock.
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
370 except OSError:
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
371 pass
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
372 return None
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
373
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
374 # Unix locking mechanism
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
375 # ~~~~~~~~~~~~~~~~~~~~~~
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
376
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
377 class UnixFileLock(BaseFileLock):
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
378 """
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
379 Uses the :func:`fcntl.flock` to hard lock the lock file on unix systems.
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
380 """
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
381
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
382 def _acquire(self):
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
383 open_mode = os.O_RDWR | os.O_CREAT | os.O_TRUNC
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
384 fd = os.open(self._lock_file, open_mode)
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
385
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
386 try:
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
387 fcntl.flock(fd, fcntl.LOCK_EX | fcntl.LOCK_NB)
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
388 except (IOError, OSError):
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
389 os.close(fd)
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
390 else:
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
391 self._lock_file_fd = fd
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
392 return None
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
393
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
394 def _release(self):
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
395 # Do not remove the lockfile:
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
396 #
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
397 # https://github.com/benediktschmitt/py-filelock/issues/31
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
398 # https://stackoverflow.com/questions/17708885/flock-removing-locked-file-without-race-condition
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
399 fd = self._lock_file_fd
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
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diff changeset
400 self._lock_file_fd = None
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401 fcntl.flock(fd, fcntl.LOCK_UN)
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402 os.close(fd)
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403 return None
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404
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405 # Soft lock
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406 # ~~~~~~~~~
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407
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408 class SoftFileLock(BaseFileLock):
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409 """
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410 Simply watches the existence of the lock file.
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411 """
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412
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413 def _acquire(self):
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414 open_mode = os.O_WRONLY | os.O_CREAT | os.O_EXCL | os.O_TRUNC
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415 try:
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416 fd = os.open(self._lock_file, open_mode)
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417 except (IOError, OSError):
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418 pass
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419 else:
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420 self._lock_file_fd = fd
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421 return None
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422
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423 def _release(self):
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424 os.close(self._lock_file_fd)
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425 self._lock_file_fd = None
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426
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427 try:
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428 os.remove(self._lock_file)
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429 # The file is already deleted and that's what we want.
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430 except OSError:
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431 pass
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432 return None
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433
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434
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435 # Platform filelock
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436 # ~~~~~~~~~~~~~~~~~
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437
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438 #: Alias for the lock, which should be used for the current platform. On
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439 #: Windows, this is an alias for :class:`WindowsFileLock`, on Unix for
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
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440 #: :class:`UnixFileLock` and otherwise for :class:`SoftFileLock`.
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441 FileLock = None
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442
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443 if msvcrt:
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444 FileLock = WindowsFileLock
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445 elif fcntl:
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446 FileLock = UnixFileLock
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447 else:
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448 FileLock = SoftFileLock
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449
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450 if warnings is not None:
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451 warnings.warn("only soft file lock is available")