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annotate rhodecode/lib/pidlock.py @ 1194:07963dd1f0f1 beta

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fixes for issue #133
author Marcin Kuzminski <marcin@python-works.com>
date Sat, 02 Apr 2011 00:42:17 +0200
parents 5cc96df705b9
children c1516b35f91d
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
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1 import os, time
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2 import sys
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3 from warnings import warn
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4 from multiprocessing.util import Finalize
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5 import errno
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6
1194
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7 from rhodecode import __platform__, PLATFORM_WIN
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8
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9 if __platform__ in PLATFORM_WIN:
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10 import ctypes
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11 def kill(pid):
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12 """kill function for Win32"""
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13 kernel32 = ctypes.windll.kernel32
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14 handle = kernel32.OpenProcess(1, 0, pid)
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15 return (0 != kernel32.TerminateProcess(handle, 0))
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16
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17 else:
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18 kill = os.kill
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19
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20 class LockHeld(Exception):pass
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21
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22
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23 class DaemonLock(object):
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24 """daemon locking
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25 USAGE:
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26 try:
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27 l = DaemonLock(desc='test lock')
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28 main()
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29 l.release()
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30 except LockHeld:
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31 sys.exit(1)
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32 """
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33
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34 def __init__(self, file=None, callbackfn=None,
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35 desc='daemon lock', debug=False):
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36
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37 self.pidfile = file if file else os.path.join(os.path.dirname(__file__),
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38 'running.lock')
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39 self.callbackfn = callbackfn
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40 self.desc = desc
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41 self.debug = debug
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42 self.held = False
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43 #run the lock automatically !
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44 self.lock()
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45 self._finalize = Finalize(self, DaemonLock._on_finalize,
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46 args=(self, debug), exitpriority=10)
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47
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48 @staticmethod
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49 def _on_finalize(lock, debug):
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50 if lock.held:
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51 if debug:
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52 print 'leck held finilazing and running lock.release()'
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53 lock.release()
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54
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55
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56 def lock(self):
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57 """locking function, if lock is present it will raise LockHeld exception
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58 """
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59 lockname = '%s' % (os.getpid())
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60 if self.debug:
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61 print 'running lock'
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62 self.trylock()
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63 self.makelock(lockname, self.pidfile)
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64 return True
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65
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66 def trylock(self):
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67 running_pid = False
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68 if self.debug:
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69 print 'checking for already running process'
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70 try:
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71 pidfile = open(self.pidfile, "r")
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72 pidfile.seek(0)
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73 running_pid = int(pidfile.readline())
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74
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75 pidfile.close()
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76
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77 if self.debug:
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78 print 'lock file present running_pid: %s, checking for execution'\
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79 % running_pid
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80 # Now we check the PID from lock file matches to the current
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81 # process PID
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82 if running_pid:
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83 try:
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84 kill(running_pid, 0)
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85 except OSError, exc:
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86 if exc.errno in (errno.ESRCH, errno.EPERM):
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87 print "Lock File is there but the program is not running"
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88 print "Removing lock file for the: %s" % running_pid
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89 self.release()
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90 else:
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91 raise
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92 else:
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93 print "You already have an instance of the program running"
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94 print "It is running as process %s" % running_pid
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95 raise LockHeld()
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96
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97 except IOError, e:
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98 if e.errno != 2:
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99 raise
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100
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101 def release(self):
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102 """releases the pid by removing the pidfile
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103 """
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104 if self.debug:
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105 print 'trying to release the pidlock'
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106
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107 if self.callbackfn:
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108 #execute callback function on release
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109 if self.debug:
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110 print 'executing callback function %s' % self.callbackfn
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111 self.callbackfn()
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112 try:
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113 if self.debug:
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114 print 'removing pidfile %s' % self.pidfile
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115 os.remove(self.pidfile)
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116 self.held = False
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117 except OSError, e:
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118 if self.debug:
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119 print 'removing pidfile failed %s' % e
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120 pass
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121
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122 def makelock(self, lockname, pidfile):
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123 """
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124 this function will make an actual lock
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125 :param lockname: acctual pid of file
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126 :param pidfile: the file to write the pid in
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127 """
406
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128 if self.debug:
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parents:
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129 print 'creating a file %s and pid: %s' % (pidfile, lockname)
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parents:
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130 pidfile = open(self.pidfile, "wb")
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parents:
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131 pidfile.write(lockname)
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Marcin Kuzminski <marcin@python-works.com>
parents:
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132 pidfile.close
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parents:
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133 self.held = True