Mercurial > kallithea
annotate rhodecode/lib/pidlock.py @ 1205:f4807acf643d beta
added __license__ into main of rhodecode, PEP8ify
author | Marcin Kuzminski <marcin@python-works.com> |
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date | Mon, 04 Apr 2011 19:43:31 +0200 |
parents | 07963dd1f0f1 |
children | c1516b35f91d |
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 |
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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 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 |
406
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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') |
406
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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 |
506
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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()) |
506
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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 """ |
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128 if self.debug: |
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129 print 'creating a file %s and pid: %s' % (pidfile, lockname) |
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130 pidfile = open(self.pidfile, "wb") |
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131 pidfile.write(lockname) |
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132 pidfile.close |
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133 self.held = True |