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annotate roundup/backends/portalocker.py @ 5296:b48e2fe4a7bd

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Make tracker user native (postgres) test indexer. This is apparently how things are expected to be set up on the server. Leaving it blank pulls in the xapian indexer which they don't want.
author John Rouillard <rouilj@ieee.org>
date Thu, 28 Sep 2017 19:22:21 -0400
parents a76fbb9f5535
children 64b05e24dbd8
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1 #!/usr/bin/env python
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2 #
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3 # portalocker.py - Cross-platform (posix/nt) API for flock-style file locking.
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4 #
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5 # http://code.activestate.com/recipes/65203-portalocker-cross-platform-posixnt-api-for-flock-s/
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6 #
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7 """
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8 Cross-platform (posix/nt) API for flock-style file locking.
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9
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10 Synopsis::
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11
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12 import portalocker
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13 file = open("somefile", "r+")
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14 portalocker.lock(file, portalocker.LOCK_EX)
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15 file.seek(12)
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16 file.write("foo")
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17 file.close()
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18
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19 If you know what you're doing, you may choose to::
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20
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21 portalocker.unlock(file)
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22
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23 before closing the file, but why?
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24
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25 Methods::
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26
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27 lock( file, flags )
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28 unlock( file )
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29
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30 Constants::
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31
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32 LOCK_EX
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33 LOCK_SH
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34 LOCK_NB
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35
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36 I learned the win32 technique for locking files from sample code
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37 provided by John Nielsen <nielsenjf@my-deja.com> in the documentation
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38 that accompanies the win32 modules.
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39
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40 :Author: Jonathan Feinberg <jdf@pobox.com>
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41
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42 Roundup Changes
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43 ---------------
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44 2012-11-28 (anatoly techtonik)
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45 - Ported to ctypes
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46 - Dropped support for Win95, Win98 and WinME
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47 - Added return result
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48 """
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49
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50 __docformat__ = 'restructuredtext'
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51
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52 import os
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53
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54 if os.name == 'nt':
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55 import msvcrt
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56 import ctypes
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57 from ctypes import windll
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58 from ctypes.wintypes import BOOL, DWORD, HANDLE
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59
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60 LOCK_SH = 0 # the default
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61 LOCK_NB = 0x1 # LOCKFILE_FAIL_IMMEDIATELY
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62 LOCK_EX = 0x2 # LOCKFILE_EXCLUSIVE_LOCK
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63
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64 # --- the code is taken from pyserial project ---
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65 #
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66 # detect size of ULONG_PTR
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67 def is_64bit():
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68 return ctypes.sizeof(ctypes.c_ulong) != ctypes.sizeof(ctypes.c_void_p)
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69 if is_64bit():
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70 ULONG_PTR = ctypes.c_int64
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71 else:
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72 ULONG_PTR = ctypes.c_ulong
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73 PVOID = ctypes.c_void_p
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74
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75 # --- Union inside Structure by stackoverflow:3480240 ---
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76 class _OFFSET(ctypes.Structure):
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77 _fields_ = [
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78 ('Offset', DWORD),
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79 ('OffsetHigh', DWORD)]
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80
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81 class _OFFSET_UNION(ctypes.Union):
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82 _anonymous_ = ['_offset']
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83 _fields_ = [
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84 ('_offset', _OFFSET),
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85 ('Pointer', PVOID)]
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86
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87 class OVERLAPPED(ctypes.Structure):
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88 _anonymous_ = ['_offset_union']
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89 _fields_ = [
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90 ('Internal', ULONG_PTR),
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91 ('InternalHigh', ULONG_PTR),
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92 ('_offset_union', _OFFSET_UNION),
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93 ('hEvent', HANDLE)]
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94
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95 LPOVERLAPPED = ctypes.POINTER(OVERLAPPED)
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96
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97 # --- Define function prototypes for extra safety ---
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98 LockFileEx = windll.kernel32.LockFileEx
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99 LockFileEx.restype = BOOL
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100 LockFileEx.argtypes = [HANDLE, DWORD, DWORD, DWORD, DWORD, LPOVERLAPPED]
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101 UnlockFileEx = windll.kernel32.UnlockFileEx
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102 UnlockFileEx.restype = BOOL
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103 UnlockFileEx.argtypes = [HANDLE, DWORD, DWORD, DWORD, LPOVERLAPPED]
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104
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105 elif os.name == 'posix':
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106 import fcntl
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107 LOCK_SH = fcntl.LOCK_SH # shared lock
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108 LOCK_NB = fcntl.LOCK_NB # non-blocking
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109 LOCK_EX = fcntl.LOCK_EX
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110 else:
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111 raise RuntimeError("PortaLocker only defined for nt and posix platforms")
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112
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113 if os.name == 'nt':
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114 def lock(file, flags):
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115 """ Return True on success, False otherwise """
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116 hfile = msvcrt.get_osfhandle(file.fileno())
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117 overlapped = OVERLAPPED()
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118 if LockFileEx(hfile, flags, 0, 0, 0xFFFF0000, ctypes.byref(overlapped)):
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119 return True
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120 else:
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121 return False
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122
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123 def unlock(file):
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124 hfile = msvcrt.get_osfhandle(file.fileno())
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125 overlapped = OVERLAPPED()
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126 if UnlockFileEx(hfile, 0, 0, 0xFFFF0000, ctypes.byref(overlapped)):
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127 return True
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128 else:
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129 return False
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131 elif os.name =='posix':
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132 def lock(file, flags):
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133 if fcntl.flock(file.fileno(), flags) == 0:
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134 return True
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135 else:
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136 return False
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137
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138 def unlock(file):
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139 if fcntl.flock(file.fileno(), fcntl.LOCK_UN) == 0:
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140 return True
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141 else:
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142 return False
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143
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144 if __name__ == '__main__':
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145 from time import time, strftime, localtime
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146 import sys
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147
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148 log = open('log.txt', "a+")
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149 lock(log, LOCK_EX)
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150
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151 timestamp = strftime("%m/%d/%Y %H:%M:%S\n", localtime(time()))
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152 log.write( timestamp )
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153
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154 print "Wrote lines. Hit enter to release lock."
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155 dummy = sys.stdin.readline()
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156
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157 log.close()
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158
Roundup Issue Tracker: http://roundup-tracker.org/