Mercurial > kallithea

annotate rhodecode/lib/pidlock.py @ 4116:ffd45b185016 rhodecode-2.2.5-gpl

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Imported some of the GPLv3'd changes from RhodeCode v2.2.5. This imports changes between changesets 21af6c4eab3d and 6177597791c2 in RhodeCode's original repository, including only changes to Python files and HTML. RhodeCode clearly licensed its changes to these files under GPLv3 in their /LICENSE file, which states the following: The Python code and integrated HTML are licensed under the GPLv3 license. (See: https://code.rhodecode.com/rhodecode/files/v2.2.5/LICENSE or http://web.archive.org/web/20140512193334/https://code.rhodecode.com/rhodecode/files/f3b123159901f15426d18e3dc395e8369f70ebe0/LICENSE for an online copy of that LICENSE file) Conservancy reviewed these changes and confirmed that they can be licensed as a whole to the Kallithea project under GPLv3-only. While some of the contents committed herein are clearly licensed GPLv3-or-later, on the whole we must assume the are GPLv3-only, since the statement above from RhodeCode indicates that they intend GPLv3-only as their license, per GPLv3ยง14 and other relevant sections of GPLv3.
author Bradley M. Kuhn <bkuhn@sfconservancy.org>
date Wed, 02 Jul 2014 19:03:13 -0400
parents 29e999f26998
children 7e5f8c12a3fc
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
4116
ffd45b185016 Imported some of the GPLv3'd changes from RhodeCode v2.2.5.
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parents: 2568
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1 # -*- coding: utf-8 -*-
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2 # This program is free software: you can redistribute it and/or modify
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3 # it under the terms of the GNU General Public License as published by
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4 # the Free Software Foundation, either version 3 of the License, or
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5 # (at your option) any later version.
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6 #
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7 # This program is distributed in the hope that it will be useful,
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8 # but WITHOUT ANY WARRANTY; without even the implied warranty of
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9 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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10 # GNU General Public License for more details.
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11 #
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12 # You should have received a copy of the GNU General Public License
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13 # along with this program. If not, see <http://www.gnu.org/licenses/>.
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14
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15 from __future__ import with_statement
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16 import os
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17 import errno
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18
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19 from multiprocessing.util import Finalize
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20
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21 from rhodecode.lib.compat import kill
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22
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23
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24 class LockHeld(Exception):
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25 pass
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26
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27
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28 class DaemonLock(object):
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29 """daemon locking
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30 USAGE:
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31 try:
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32 l = DaemonLock(file_='/path/tolockfile',desc='test lock')
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33 main()
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34 l.release()
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35 except LockHeld:
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36 sys.exit(1)
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37 """
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38
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39 def __init__(self, file_=None, callbackfn=None,
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40 desc='daemon lock', debug=False):
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41
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42 lock_name = os.path.join(os.path.dirname(__file__), 'running.lock')
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43 self.pidfile = file_ if file_ else lock_name
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44 self.callbackfn = callbackfn
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45 self.desc = desc
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46 self.debug = debug
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47 self.held = False
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48 #run the lock automatically !
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49 self.lock()
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50 self._finalize = Finalize(self, DaemonLock._on_finalize,
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51 args=(self, debug), exitpriority=10)
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52
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53 @staticmethod
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54 def _on_finalize(lock, debug):
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55 if lock.held:
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56 if debug:
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57 print 'leck held finilazing and running lock.release()'
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58 lock.release()
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59
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60 def lock(self):
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61 """
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62 locking function, if lock is present it
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63 will raise LockHeld exception
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64 """
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65 lockname = '%s' % (os.getpid())
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66 if self.debug:
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67 print 'running lock'
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68 self.trylock()
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69 self.makelock(lockname, self.pidfile)
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70 return True
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71
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72 def trylock(self):
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73 running_pid = False
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74 if self.debug:
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75 print 'checking for already running process'
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76 try:
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77 with open(self.pidfile, 'r') as f:
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78 try:
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79 running_pid = int(f.readline())
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80 except ValueError:
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81 running_pid = -1
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82
406
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83 if self.debug:
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84 print ('lock file present running_pid: %s, '
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85 'checking for execution' % (running_pid,))
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86 # Now we check the PID from lock file matches to the current
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87 # process PID
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88 if running_pid:
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89 try:
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90 kill(running_pid, 0)
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91 except OSError, exc:
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92 if exc.errno in (errno.ESRCH, errno.EPERM):
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93 print ("Lock File is there but"
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94 " the program is not running")
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95 print "Removing lock file for the: %s" % running_pid
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96 self.release()
509
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97 else:
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98 raise
406
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99 else:
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100 print "You already have an instance of the program running"
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101 print "It is running as process %s" % running_pid
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102 raise LockHeld()
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103
406
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104 except IOError, e:
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105 if e.errno != 2:
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106 raise
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107
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108 def release(self):
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109 """releases the pid by removing the pidfile
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110 """
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111 if self.debug:
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112 print 'trying to release the pidlock'
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113
406
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114 if self.callbackfn:
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115 #execute callback function on release
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116 if self.debug:
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117 print 'executing callback function %s' % self.callbackfn
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118 self.callbackfn()
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119 try:
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120 if self.debug:
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121 print 'removing pidfile %s' % self.pidfile
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122 os.remove(self.pidfile)
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123 self.held = False
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124 except OSError, e:
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125 if self.debug:
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126 print 'removing pidfile failed %s' % e
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127 pass
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128
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129 def makelock(self, lockname, pidfile):
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130 """
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131 this function will make an actual lock
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132
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133 :param lockname: acctual pid of file
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134 :param pidfile: the file to write the pid in
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135 """
406
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136 if self.debug:
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137 print 'creating a file %s and pid: %s' % (pidfile, lockname)
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138
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139 dir_, file_ = os.path.split(pidfile)
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140 if not os.path.isdir(dir_):
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141 os.makedirs(dir_)
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142 with open(self.pidfile, 'wb') as f:
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143 f.write(lockname)
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144 self.held = True