Mercurial > repos > shellac > guppy_basecaller

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

Find changesets by keywords (author, files, the commit message), revision number or hash, or revset expression.
"planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
author shellac
date Sat, 02 May 2020 07:14:21 -0400
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0
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1 # -*- coding: utf-8 -*-
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2
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3 """
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4 lockfile.py - Platform-independent advisory file locks.
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5
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6 Requires Python 2.5 unless you apply 2.4.diff
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7 Locking is done on a per-thread basis instead of a per-process basis.
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8
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9 Usage:
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10
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11 >>> lock = LockFile('somefile')
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12 >>> try:
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13 ... lock.acquire()
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14 ... except AlreadyLocked:
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15 ... print 'somefile', 'is locked already.'
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16 ... except LockFailed:
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17 ... print 'somefile', 'can\\'t be locked.'
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18 ... else:
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19 ... print 'got lock'
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20 got lock
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21 >>> print lock.is_locked()
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22 True
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23 >>> lock.release()
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24
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25 >>> lock = LockFile('somefile')
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26 >>> print lock.is_locked()
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27 False
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28 >>> with lock:
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29 ... print lock.is_locked()
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30 True
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31 >>> print lock.is_locked()
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32 False
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33
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34 >>> lock = LockFile('somefile')
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35 >>> # It is okay to lock twice from the same thread...
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36 >>> with lock:
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37 ... lock.acquire()
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38 ...
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39 >>> # Though no counter is kept, so you can't unlock multiple times...
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40 >>> print lock.is_locked()
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41 False
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42
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43 Exceptions:
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44
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45 Error - base class for other exceptions
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46 LockError - base class for all locking exceptions
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47 AlreadyLocked - Another thread or process already holds the lock
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48 LockFailed - Lock failed for some other reason
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49 UnlockError - base class for all unlocking exceptions
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50 AlreadyUnlocked - File was not locked.
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51 NotMyLock - File was locked but not by the current thread/process
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52 """
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53
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54 from __future__ import absolute_import
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55
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56 import functools
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57 import os
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58 import socket
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59 import threading
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60 import warnings
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61
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62 # Work with PEP8 and non-PEP8 versions of threading module.
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63 if not hasattr(threading, "current_thread"):
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64 threading.current_thread = threading.currentThread
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65 if not hasattr(threading.Thread, "get_name"):
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66 threading.Thread.get_name = threading.Thread.getName
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67
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68 __all__ = ['Error', 'LockError', 'LockTimeout', 'AlreadyLocked',
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69 'LockFailed', 'UnlockError', 'NotLocked', 'NotMyLock',
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70 'LinkFileLock', 'MkdirFileLock', 'SQLiteFileLock',
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71 'LockBase', 'locked']
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72
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73
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74 class Error(Exception):
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75 """
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76 Base class for other exceptions.
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77
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78 >>> try:
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79 ... raise Error
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80 ... except Exception:
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81 ... pass
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82 """
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83 pass
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84
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85
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86 class LockError(Error):
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87 """
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88 Base class for error arising from attempts to acquire the lock.
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89
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90 >>> try:
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91 ... raise LockError
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92 ... except Error:
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93 ... pass
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94 """
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95 pass
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96
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97
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98 class LockTimeout(LockError):
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99 """Raised when lock creation fails within a user-defined period of time.
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100
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101 >>> try:
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102 ... raise LockTimeout
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103 ... except LockError:
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104 ... pass
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105 """
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106 pass
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107
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108
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109 class AlreadyLocked(LockError):
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110 """Some other thread/process is locking the file.
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111
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112 >>> try:
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113 ... raise AlreadyLocked
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114 ... except LockError:
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115 ... pass
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116 """
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117 pass
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118
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119
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120 class LockFailed(LockError):
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121 """Lock file creation failed for some other reason.
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122
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123 >>> try:
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124 ... raise LockFailed
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125 ... except LockError:
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126 ... pass
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127 """
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128 pass
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129
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130
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131 class UnlockError(Error):
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132 """
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133 Base class for errors arising from attempts to release the lock.
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134
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135 >>> try:
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136 ... raise UnlockError
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137 ... except Error:
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138 ... pass
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139 """
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140 pass
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141
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142
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143 class NotLocked(UnlockError):
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144 """Raised when an attempt is made to unlock an unlocked file.
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145
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146 >>> try:
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147 ... raise NotLocked
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148 ... except UnlockError:
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149 ... pass
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150 """
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151 pass
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152
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153
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154 class NotMyLock(UnlockError):
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155 """Raised when an attempt is made to unlock a file someone else locked.
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156
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157 >>> try:
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158 ... raise NotMyLock
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159 ... except UnlockError:
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160 ... pass
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161 """
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162 pass
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163
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164
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165 class _SharedBase(object):
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166 def __init__(self, path):
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167 self.path = path
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168
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169 def acquire(self, timeout=None):
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170 """
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171 Acquire the lock.
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172
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173 * If timeout is omitted (or None), wait forever trying to lock the
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174 file.
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175
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176 * If timeout > 0, try to acquire the lock for that many seconds. If
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177 the lock period expires and the file is still locked, raise
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178 LockTimeout.
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179
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180 * If timeout <= 0, raise AlreadyLocked immediately if the file is
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181 already locked.
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182 """
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183 raise NotImplemented("implement in subclass")
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184
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185 def release(self):
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186 """
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187 Release the lock.
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188
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189 If the file is not locked, raise NotLocked.
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190 """
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191 raise NotImplemented("implement in subclass")
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192
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193 def __enter__(self):
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194 """
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195 Context manager support.
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196 """
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197 self.acquire()
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198 return self
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199
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200 def __exit__(self, *_exc):
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201 """
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202 Context manager support.
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203 """
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204 self.release()
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205
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206 def __repr__(self):
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207 return "<%s: %r>" % (self.__class__.__name__, self.path)
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208
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209
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210 class LockBase(_SharedBase):
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211 """Base class for platform-specific lock classes."""
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212 def __init__(self, path, threaded=True, timeout=None):
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213 """
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214 >>> lock = LockBase('somefile')
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215 >>> lock = LockBase('somefile', threaded=False)
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216 """
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217 super(LockBase, self).__init__(path)
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218 self.lock_file = os.path.abspath(path) + ".lock"
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219 self.hostname = socket.gethostname()
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220 self.pid = os.getpid()
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221 if threaded:
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222 t = threading.current_thread()
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223 # Thread objects in Python 2.4 and earlier do not have ident
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224 # attrs. Worm around that.
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225 ident = getattr(t, "ident", hash(t))
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226 self.tname = "-%x" % (ident & 0xffffffff)
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227 else:
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228 self.tname = ""
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229 dirname = os.path.dirname(self.lock_file)
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230
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231 # unique name is mostly about the current process, but must
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232 # also contain the path -- otherwise, two adjacent locked
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233 # files conflict (one file gets locked, creating lock-file and
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234 # unique file, the other one gets locked, creating lock-file
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235 # and overwriting the already existing lock-file, then one
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236 # gets unlocked, deleting both lock-file and unique file,
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237 # finally the last lock errors out upon releasing.
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238 self.unique_name = os.path.join(dirname,
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239 "%s%s.%s%s" % (self.hostname,
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240 self.tname,
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241 self.pid,
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242 hash(self.path)))
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243 self.timeout = timeout
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244
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245 def is_locked(self):
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246 """
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247 Tell whether or not the file is locked.
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248 """
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249 raise NotImplemented("implement in subclass")
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250
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251 def i_am_locking(self):
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252 """
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253 Return True if this object is locking the file.
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254 """
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255 raise NotImplemented("implement in subclass")
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256
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257 def break_lock(self):
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258 """
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259 Remove a lock. Useful if a locking thread failed to unlock.
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260 """
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261 raise NotImplemented("implement in subclass")
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262
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263 def __repr__(self):
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264 return "<%s: %r -- %r>" % (self.__class__.__name__, self.unique_name,
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265 self.path)
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266
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267
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268 def _fl_helper(cls, mod, *args, **kwds):
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269 warnings.warn("Import from %s module instead of lockfile package" % mod,
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270 DeprecationWarning, stacklevel=2)
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271 # This is a bit funky, but it's only for awhile. The way the unit tests
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272 # are constructed this function winds up as an unbound method, so it
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273 # actually takes three args, not two. We want to toss out self.
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274 if not isinstance(args[0], str):
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275 # We are testing, avoid the first arg
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276 args = args[1:]
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277 if len(args) == 1 and not kwds:
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278 kwds["threaded"] = True
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279 return cls(*args, **kwds)
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280
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281
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282 def LinkFileLock(*args, **kwds):
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283 """Factory function provided for backwards compatibility.
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284
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285 Do not use in new code. Instead, import LinkLockFile from the
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286 lockfile.linklockfile module.
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287 """
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288 from . import linklockfile
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289 return _fl_helper(linklockfile.LinkLockFile, "lockfile.linklockfile",
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290 *args, **kwds)
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291
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292
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293 def MkdirFileLock(*args, **kwds):
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294 """Factory function provided for backwards compatibility.
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295
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296 Do not use in new code. Instead, import MkdirLockFile from the
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297 lockfile.mkdirlockfile module.
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298 """
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299 from . import mkdirlockfile
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300 return _fl_helper(mkdirlockfile.MkdirLockFile, "lockfile.mkdirlockfile",
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301 *args, **kwds)
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302
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303
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304 def SQLiteFileLock(*args, **kwds):
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305 """Factory function provided for backwards compatibility.
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306
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307 Do not use in new code. Instead, import SQLiteLockFile from the
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308 lockfile.mkdirlockfile module.
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309 """
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310 from . import sqlitelockfile
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311 return _fl_helper(sqlitelockfile.SQLiteLockFile, "lockfile.sqlitelockfile",
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312 *args, **kwds)
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313
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314
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315 def locked(path, timeout=None):
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316 """Decorator which enables locks for decorated function.
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317
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318 Arguments:
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319 - path: path for lockfile.
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320 - timeout (optional): Timeout for acquiring lock.
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321
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322 Usage:
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323 @locked('/var/run/myname', timeout=0)
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324 def myname(...):
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325 ...
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326 """
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327 def decor(func):
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328 @functools.wraps(func)
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329 def wrapper(*args, **kwargs):
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330 lock = FileLock(path, timeout=timeout)
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331 lock.acquire()
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332 try:
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333 return func(*args, **kwargs)
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334 finally:
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335 lock.release()
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336 return wrapper
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337 return decor
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338
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339
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340 if hasattr(os, "link"):
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341 from . import linklockfile as _llf
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342 LockFile = _llf.LinkLockFile
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343 else:
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344 from . import mkdirlockfile as _mlf
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345 LockFile = _mlf.MkdirLockFile
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346
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347 FileLock = LockFile