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annotate roundup/backends/portalocker.py @ 7800:2d4684e4702d

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fix: enhancement to history command output and % template fix. Rather than using the key field, use the label field for descriptions. Call cls.labelprop(default_to_id=True) so it returns id rather than the first sorted property name. If labelprop() returns 'id' or 'title', we return nothing. 'id' means there is no label set and no properties named 'name' or 'title'. So have the caller do whatever it wants (prepend classname for example) when there is no human readable name. This prevents %(name)s%(key)s from producing: 23(23). Also don't accept the 'title' property. Titles can be too long. Arguably we could: '%(name)20s' to limit the title length. However without ellipses or something truncating the title might be confusing. So again pretend there is no human readable name.
author John Rouillard <rouilj@ieee.org>
date Tue, 12 Mar 2024 11:52:17 -0400
parents a50712b6ad56
children 9c3ec0a5c7fc
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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 from __future__ import print_function
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51 __docformat__ = 'restructuredtext'
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52
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53 import os
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54
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55 if os.name == 'nt':
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56 import msvcrt
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57 import ctypes
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58 from ctypes import windll
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59 from ctypes.wintypes import BOOL, DWORD, HANDLE
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60
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61 LOCK_SH = 0 # the default
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62 LOCK_NB = 0x1 # LOCKFILE_FAIL_IMMEDIATELY
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63 LOCK_EX = 0x2 # LOCKFILE_EXCLUSIVE_LOCK
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64
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65 # --- the code is taken from pyserial project ---
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66 #
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67 # detect size of ULONG_PTR
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68 def is_64bit():
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69 return ctypes.sizeof(ctypes.c_ulong) != ctypes.sizeof(ctypes.c_void_p)
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70 if is_64bit():
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71 ULONG_PTR = ctypes.c_int64
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72 else:
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73 ULONG_PTR = ctypes.c_ulong
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74 PVOID = ctypes.c_void_p
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75
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76 # --- Union inside Structure by stackoverflow:3480240 ---
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77 class _OFFSET(ctypes.Structure):
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78 _fields_ = [
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79 ('Offset', DWORD),
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80 ('OffsetHigh', DWORD)]
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81
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82 class _OFFSET_UNION(ctypes.Union):
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83 _anonymous_ = ['_offset']
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84 _fields_ = [
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85 ('_offset', _OFFSET),
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86 ('Pointer', PVOID)]
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87
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88 class OVERLAPPED(ctypes.Structure):
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89 _anonymous_ = ['_offset_union']
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90 _fields_ = [
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91 ('Internal', ULONG_PTR),
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92 ('InternalHigh', ULONG_PTR),
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93 ('_offset_union', _OFFSET_UNION),
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94 ('hEvent', HANDLE)]
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95
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96 LPOVERLAPPED = ctypes.POINTER(OVERLAPPED)
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97
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98 # --- Define function prototypes for extra safety ---
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99 LockFileEx = windll.kernel32.LockFileEx
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100 LockFileEx.restype = BOOL
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101 LockFileEx.argtypes = [HANDLE, DWORD, DWORD, DWORD, DWORD, LPOVERLAPPED]
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102 UnlockFileEx = windll.kernel32.UnlockFileEx
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103 UnlockFileEx.restype = BOOL
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104 UnlockFileEx.argtypes = [HANDLE, DWORD, DWORD, DWORD, LPOVERLAPPED]
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105
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106 elif os.name == 'posix':
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107 import fcntl
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108 LOCK_SH = fcntl.LOCK_SH # shared lock
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109 LOCK_NB = fcntl.LOCK_NB # non-blocking
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110 LOCK_EX = fcntl.LOCK_EX
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111 else:
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112 raise RuntimeError("PortaLocker only defined for nt and posix platforms")
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114 if os.name == 'nt':
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115 def lock(file, flags):
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116 """ Return True on success, False otherwise """
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117 hfile = msvcrt.get_osfhandle(file.fileno())
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118 overlapped = OVERLAPPED()
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119 if LockFileEx(hfile, flags, 0, 0, 0xFFFF0000,
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120 ctypes.byref(overlapped)):
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121 return True
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122 else:
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123 return False
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124
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125 def unlock(file):
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126 hfile = msvcrt.get_osfhandle(file.fileno())
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anatoly techtonik <techtonik@gmail.com>
parents: 4681
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127 overlapped = OVERLAPPED()
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d27de8f08c31 Remove 'import *' statement from roundup/backends/portalocker.py
John Kristensen <john@jerrykan.com>
parents: 4686
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128 if UnlockFileEx(hfile, 0, 0, 0xFFFF0000, ctypes.byref(overlapped)):
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anatoly techtonik <techtonik@gmail.com>
parents: 4681
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129 return True
4e740f02e165 Remove pywin32 installation dependency by porting portalocker.py to ctypes.
anatoly techtonik <techtonik@gmail.com>
parents: 4681
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130 else:
4e740f02e165 Remove pywin32 installation dependency by porting portalocker.py to ctypes.
anatoly techtonik <techtonik@gmail.com>
parents: 4681
diff changeset
131 return False
690
509a101305da node ids are now generated from a lockable store - no more race conditions
Richard Jones <richard@users.sourceforge.net>
parents:
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132
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a50712b6ad56 flake8 fixes whitespace
John Rouillard <rouilj@ieee.org>
parents: 5376
diff changeset
133 elif os.name == 'posix':
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Richard Jones <richard@users.sourceforge.net>
parents: 1244
diff changeset
134 def lock(file, flags):
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anatoly techtonik <techtonik@gmail.com>
parents: 4681
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135 if fcntl.flock(file.fileno(), flags) == 0:
4e740f02e165 Remove pywin32 installation dependency by porting portalocker.py to ctypes.
anatoly techtonik <techtonik@gmail.com>
parents: 4681
diff changeset
136 return True
4e740f02e165 Remove pywin32 installation dependency by porting portalocker.py to ctypes.
anatoly techtonik <techtonik@gmail.com>
parents: 4681
diff changeset
137 else:
4e740f02e165 Remove pywin32 installation dependency by porting portalocker.py to ctypes.
anatoly techtonik <techtonik@gmail.com>
parents: 4681
diff changeset
138 return False
690
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Richard Jones <richard@users.sourceforge.net>
parents:
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139
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Richard Jones <richard@users.sourceforge.net>
parents: 1244
diff changeset
140 def unlock(file):
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anatoly techtonik <techtonik@gmail.com>
parents: 4681
diff changeset
141 if fcntl.flock(file.fileno(), fcntl.LOCK_UN) == 0:
4e740f02e165 Remove pywin32 installation dependency by porting portalocker.py to ctypes.
anatoly techtonik <techtonik@gmail.com>
parents: 4681
diff changeset
142 return True
4e740f02e165 Remove pywin32 installation dependency by porting portalocker.py to ctypes.
anatoly techtonik <techtonik@gmail.com>
parents: 4681
diff changeset
143 else:
4e740f02e165 Remove pywin32 installation dependency by porting portalocker.py to ctypes.
anatoly techtonik <techtonik@gmail.com>
parents: 4681
diff changeset
144 return False
690
509a101305da node ids are now generated from a lockable store - no more race conditions
Richard Jones <richard@users.sourceforge.net>
parents:
diff changeset
145
509a101305da node ids are now generated from a lockable store - no more race conditions
Richard Jones <richard@users.sourceforge.net>
parents:
diff changeset
146 if __name__ == '__main__':
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Richard Jones <richard@users.sourceforge.net>
parents: 1244
diff changeset
147 from time import time, strftime, localtime
e975db910d9f latest version of portalocker fixed for win98 and winnt, thanks James Kew
Richard Jones <richard@users.sourceforge.net>
parents: 1244
diff changeset
148 import sys
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Richard Jones <richard@users.sourceforge.net>
parents:
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149
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Richard Jones <richard@users.sourceforge.net>
parents: 1244
diff changeset
150 log = open('log.txt', "a+")
4357
13b3155869e0 Beginnings of a big code cleanup / modernisation to make 2to3 happy
Richard Jones <richard@users.sourceforge.net>
parents: 3701
diff changeset
151 lock(log, LOCK_EX)
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Richard Jones <richard@users.sourceforge.net>
parents:
diff changeset
152
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Richard Jones <richard@users.sourceforge.net>
parents: 1244
diff changeset
153 timestamp = strftime("%m/%d/%Y %H:%M:%S\n", localtime(time()))
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John Rouillard <rouilj@ieee.org>
parents: 5376
diff changeset
154 log.write(timestamp)
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Richard Jones <richard@users.sourceforge.net>
parents:
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155
5376
64b05e24dbd8 Python 3 preparation: convert print to a function.
Joseph Myers <jsm@polyomino.org.uk>
parents: 5174
diff changeset
156 print("Wrote lines. Hit enter to release lock.")
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Richard Jones <richard@users.sourceforge.net>
parents: 1244
diff changeset
157 dummy = sys.stdin.readline()
690
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Richard Jones <richard@users.sourceforge.net>
parents:
diff changeset
158
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Richard Jones <richard@users.sourceforge.net>
parents: 1244
diff changeset
159 log.close()
Roundup Issue Tracker: http://roundup-tracker.org/