Mercurial > kallithea

annotate rhodecode/lib/pidlock.py @ 1549:d6cb805c92fd beta

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moved kill function to compat
author Marcin Kuzminski <marcin@python-works.com>
date Tue, 11 Oct 2011 20:59:41 -0500
parents 191f3f08236d
children 29e999f26998
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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
1549
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9 from rhodecode.lib.compat import kill
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10
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11 class LockHeld(Exception):
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12 pass
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13
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14
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15 class DaemonLock(object):
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16 """daemon locking
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17 USAGE:
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18 try:
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19 l = DaemonLock(file_='/path/tolockfile',desc='test lock')
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20 main()
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21 l.release()
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22 except LockHeld:
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23 sys.exit(1)
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24 """
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25
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26 def __init__(self, file_=None, callbackfn=None,
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27 desc='daemon lock', debug=False):
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28
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29 self.pidfile = file_ if file_ else os.path.join(
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30 os.path.dirname(__file__),
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31 'running.lock')
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32 self.callbackfn = callbackfn
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33 self.desc = desc
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34 self.debug = debug
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35 self.held = False
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36 #run the lock automatically !
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37 self.lock()
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38 self._finalize = Finalize(self, DaemonLock._on_finalize,
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39 args=(self, debug), exitpriority=10)
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41 @staticmethod
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42 def _on_finalize(lock, debug):
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43 if lock.held:
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44 if debug:
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45 print 'leck held finilazing and running lock.release()'
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46 lock.release()
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47
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48 def lock(self):
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49 """
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50 locking function, if lock is present it
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51 will raise LockHeld exception
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52 """
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53 lockname = '%s' % (os.getpid())
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54 if self.debug:
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55 print 'running lock'
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56 self.trylock()
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57 self.makelock(lockname, self.pidfile)
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58 return True
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59
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60 def trylock(self):
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61 running_pid = False
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62 if self.debug:
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63 print 'checking for already running process'
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64 try:
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65 pidfile = open(self.pidfile, "r")
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66 pidfile.seek(0)
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67 running_pid = int(pidfile.readline())
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68
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69 pidfile.close()
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70
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71 if self.debug:
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72 print ('lock file present running_pid: %s, '
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73 'checking for execution') % running_pid
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74 # Now we check the PID from lock file matches to the current
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75 # process PID
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76 if running_pid:
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77 try:
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78 kill(running_pid, 0)
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79 except OSError, exc:
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80 if exc.errno in (errno.ESRCH, errno.EPERM):
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81 print ("Lock File is there but"
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82 " the program is not running")
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83 print "Removing lock file for the: %s" % running_pid
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84 self.release()
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85 else:
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86 raise
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87 else:
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88 print "You already have an instance of the program running"
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89 print "It is running as process %s" % running_pid
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90 raise LockHeld()
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91
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92 except IOError, e:
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93 if e.errno != 2:
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94 raise
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95
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96 def release(self):
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97 """releases the pid by removing the pidfile
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98 """
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99 if self.debug:
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100 print 'trying to release the pidlock'
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101
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102 if self.callbackfn:
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103 #execute callback function on release
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104 if self.debug:
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105 print 'executing callback function %s' % self.callbackfn
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106 self.callbackfn()
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107 try:
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108 if self.debug:
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109 print 'removing pidfile %s' % self.pidfile
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110 os.remove(self.pidfile)
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111 self.held = False
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112 except OSError, e:
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113 if self.debug:
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114 print 'removing pidfile failed %s' % e
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115 pass
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116
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117 def makelock(self, lockname, pidfile):
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118 """
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119 this function will make an actual lock
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120
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121 :param lockname: acctual pid of file
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122 :param pidfile: the file to write the pid in
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123 """
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124 if self.debug:
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125 print 'creating a file %s and pid: %s' % (pidfile, lockname)
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126 pidfile = open(self.pidfile, "wb")
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127 pidfile.write(lockname)
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128 pidfile.close
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Marcin Kuzminski <marcin@python-works.com>
parents:
diff changeset
129 self.held = True