Mercurial > kallithea
annotate rhodecode/lib/pidlock.py @ 759:a7f50911a945 beta
Models code cleanups
author | Marcin Kuzminski <marcin@python-works.com> |
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date | Thu, 25 Nov 2010 22:16:29 +0100 |
parents | 5cc96df705b9 |
children | 07963dd1f0f1 |
rev | line source |
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406
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1 import os, time |
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2 import sys |
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3 from warnings import warn |
506
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4 from multiprocessing.util import Finalize |
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5 import errno |
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6 |
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7 class LockHeld(Exception):pass |
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8 |
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9 |
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10 class DaemonLock(object): |
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11 """daemon locking |
406
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12 USAGE: |
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13 try: |
504
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14 l = DaemonLock(desc='test lock') |
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15 main() |
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16 l.release() |
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17 except LockHeld: |
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18 sys.exit(1) |
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19 """ |
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20 |
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21 def __init__(self, file=None, callbackfn=None, |
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22 desc='daemon lock', debug=False): |
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23 |
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24 self.pidfile = file if file else os.path.join(os.path.dirname(__file__), |
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25 'running.lock') |
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26 self.callbackfn = callbackfn |
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27 self.desc = desc |
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28 self.debug = debug |
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29 self.held = False |
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30 #run the lock automatically ! |
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31 self.lock() |
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32 self._finalize = Finalize(self, DaemonLock._on_finalize, |
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33 args=(self, debug), exitpriority=10) |
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34 |
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35 @staticmethod |
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36 def _on_finalize(lock, debug): |
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37 if lock.held: |
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38 if debug: |
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39 print 'leck held finilazing and running lock.release()' |
d5efb83590ef
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40 lock.release() |
406
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41 |
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42 |
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43 def lock(self): |
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44 """locking function, if lock is present it will raise LockHeld exception |
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45 """ |
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46 lockname = '%s' % (os.getpid()) |
506
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47 if self.debug: |
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48 print 'running lock' |
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49 self.trylock() |
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50 self.makelock(lockname, self.pidfile) |
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51 return True |
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52 |
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53 def trylock(self): |
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54 running_pid = False |
506
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55 if self.debug: |
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56 print 'checking for already running process' |
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57 try: |
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58 pidfile = open(self.pidfile, "r") |
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59 pidfile.seek(0) |
506
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60 running_pid = int(pidfile.readline()) |
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61 |
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62 pidfile.close() |
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63 |
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64 if self.debug: |
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65 print 'lock file present running_pid: %s, checking for execution'\ |
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66 % running_pid |
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67 # Now we check the PID from lock file matches to the current |
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68 # process PID |
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69 if running_pid: |
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70 try: |
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71 os.kill(running_pid, 0) |
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72 except OSError, exc: |
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73 if exc.errno in (errno.ESRCH, errno.EPERM): |
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74 print "Lock File is there but the program is not running" |
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75 print "Removing lock file for the: %s" % running_pid |
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76 self.release() |
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77 else: |
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78 raise |
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79 else: |
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80 print "You already have an instance of the program running" |
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81 print "It is running as process %s" % running_pid |
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82 raise LockHeld() |
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83 |
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84 except IOError, e: |
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85 if e.errno != 2: |
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86 raise |
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87 |
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88 def release(self): |
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89 """releases the pid by removing the pidfile |
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90 """ |
506
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91 if self.debug: |
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92 print 'trying to release the pidlock' |
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93 |
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94 if self.callbackfn: |
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95 #execute callback function on release |
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96 if self.debug: |
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97 print 'executing callback function %s' % self.callbackfn |
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98 self.callbackfn() |
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99 try: |
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100 if self.debug: |
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101 print 'removing pidfile %s' % self.pidfile |
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102 os.remove(self.pidfile) |
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103 self.held = False |
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104 except OSError, e: |
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105 if self.debug: |
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106 print 'removing pidfile failed %s' % e |
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107 pass |
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108 |
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109 def makelock(self, lockname, pidfile): |
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110 """ |
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111 this function will make an actual lock |
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112 :param lockname: acctual pid of file |
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113 :param pidfile: the file to write the pid in |
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114 """ |
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115 if self.debug: |
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116 print 'creating a file %s and pid: %s' % (pidfile, lockname) |
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117 pidfile = open(self.pidfile, "wb") |
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118 pidfile.write(lockname) |
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119 pidfile.close |
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120 self.held = True |