Mercurial > kallithea

annotate rhodecode/lib/pidlock.py @ 3181:efe23d6c178c rhodecode-0.0.1.5.2

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merged with beta
author Marcin Kuzminski <marcin@python-works.com>
date Mon, 21 Jan 2013 00:49:59 +0100
parents 29e999f26998
children ffd45b185016
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rev   line source
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1 import os
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2 import sys
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3 import time
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4 import errno
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5
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6 from warnings import warn
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7 from multiprocessing.util import Finalize
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8
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9 from rhodecode.lib.compat import kill
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10
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11
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12 class LockHeld(Exception):
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13 pass
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14
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15
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16 class DaemonLock(object):
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17 """daemon locking
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18 USAGE:
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19 try:
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20 l = DaemonLock(file_='/path/tolockfile',desc='test lock')
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21 main()
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22 l.release()
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23 except LockHeld:
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24 sys.exit(1)
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25 """
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26
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27 def __init__(self, file_=None, callbackfn=None,
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28 desc='daemon lock', debug=False):
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29
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30 self.pidfile = file_ if file_ else os.path.join(
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31 os.path.dirname(__file__),
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32 'running.lock')
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33 self.callbackfn = callbackfn
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34 self.desc = desc
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35 self.debug = debug
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36 self.held = False
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37 #run the lock automatically !
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38 self.lock()
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39 self._finalize = Finalize(self, DaemonLock._on_finalize,
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40 args=(self, debug), exitpriority=10)
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41
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42 @staticmethod
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43 def _on_finalize(lock, debug):
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44 if lock.held:
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45 if debug:
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46 print 'leck held finilazing and running lock.release()'
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47 lock.release()
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48
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49 def lock(self):
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50 """
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51 locking function, if lock is present it
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52 will raise LockHeld exception
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53 """
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54 lockname = '%s' % (os.getpid())
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55 if self.debug:
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56 print 'running lock'
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57 self.trylock()
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58 self.makelock(lockname, self.pidfile)
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59 return True
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60
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61 def trylock(self):
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62 running_pid = False
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63 if self.debug:
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64 print 'checking for already running process'
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65 try:
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66 pidfile = open(self.pidfile, "r")
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67 pidfile.seek(0)
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68 running_pid = int(pidfile.readline())
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69
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70 pidfile.close()
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71
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72 if self.debug:
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73 print ('lock file present running_pid: %s, '
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74 'checking for execution') % running_pid
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75 # Now we check the PID from lock file matches to the current
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76 # process PID
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77 if running_pid:
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78 try:
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79 kill(running_pid, 0)
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80 except OSError, exc:
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81 if exc.errno in (errno.ESRCH, errno.EPERM):
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82 print ("Lock File is there but"
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83 " the program is not running")
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84 print "Removing lock file for the: %s" % running_pid
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85 self.release()
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86 else:
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87 raise
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88 else:
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89 print "You already have an instance of the program running"
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90 print "It is running as process %s" % running_pid
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91 raise LockHeld()
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92
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93 except IOError, e:
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94 if e.errno != 2:
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95 raise
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96
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97 def release(self):
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98 """releases the pid by removing the pidfile
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99 """
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100 if self.debug:
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101 print 'trying to release the pidlock'
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102
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103 if self.callbackfn:
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104 #execute callback function on release
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105 if self.debug:
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106 print 'executing callback function %s' % self.callbackfn
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107 self.callbackfn()
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108 try:
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109 if self.debug:
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110 print 'removing pidfile %s' % self.pidfile
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111 os.remove(self.pidfile)
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112 self.held = False
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113 except OSError, e:
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114 if self.debug:
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115 print 'removing pidfile failed %s' % e
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116 pass
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117
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118 def makelock(self, lockname, pidfile):
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119 """
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120 this function will make an actual lock
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121
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122 :param lockname: acctual pid of file
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123 :param pidfile: the file to write the pid in
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124 """
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125 if self.debug:
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126 print 'creating a file %s and pid: %s' % (pidfile, lockname)
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127
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128 dir_, file_ = os.path.split(pidfile)
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129 if not os.path.isdir(dir_):
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130 os.makedirs(dir_)
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131 pidfile = open(self.pidfile, "wb")
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132 pidfile.write(lockname)
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133 pidfile.close
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134 self.held = True