Mercurial > kallithea

annotate rhodecode/lib/pidlock.py @ 3774:60335b702a00 beta

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invalidation: don't create CacheInvalidation records on startup Creating the records early gave an advantage before lightweight was introduced. With lightweight it is no longer necessary. The records will be created on demand anyway and there is no reason to create and maintain them before they are used.
author Mads Kiilerich <madski@unity3d.com>
date Wed, 03 Apr 2013 15:56:12 +0200
parents 29e999f26998
children ffd45b185016
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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)
29e999f26998 pidlock always create dirs for lock file
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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