Mercurial > kallithea
annotate pylons_app/lib/pidlock.py @ 504:d280aa1c85c6
removed pidlock from whoosh and added it as locked_task decorator
author | Marcin Kuzminski <marcin@python-works.com> |
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date | Sat, 25 Sep 2010 20:17:56 +0200 |
parents | fb0c3af6031b |
children | d5efb83590ef |
rev | line source |
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406
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Implemented search using whoosh. Still as experimental option.
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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 |
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5 class LockHeld(Exception):pass |
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6 |
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7 |
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8 class DaemonLock(object): |
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9 """daemon locking |
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10 USAGE: |
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11 try: |
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12 l = DaemonLock(desc='test lock') |
406
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13 main() |
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14 l.release() |
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15 except LockHeld: |
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16 sys.exit(1) |
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17 """ |
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18 |
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19 def __init__(self, file=None, callbackfn=None, |
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20 desc='daemon lock', debug=False): |
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21 |
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22 self.pidfile = file if file else os.path.join(os.path.dirname(__file__), |
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23 'running.lock') |
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24 self.callbackfn = callbackfn |
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25 self.desc = desc |
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26 self.debug = debug |
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27 self.held = False |
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28 #run the lock automatically ! |
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29 self.lock() |
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30 |
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31 def __del__(self): |
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32 if self.held: |
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33 |
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34 # warn("use lock.release instead of del lock", |
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35 # category = DeprecationWarning, |
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36 # stacklevel = 2) |
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37 |
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38 # ensure the lock will be removed |
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39 self.release() |
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40 |
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41 |
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42 def lock(self): |
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parents:
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43 """locking function, if lock is present it will raise LockHeld exception |
497
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parents:
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44 """ |
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45 lockname = '%s' % (os.getpid()) |
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46 |
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47 self.trylock() |
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48 self.makelock(lockname, self.pidfile) |
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49 return True |
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50 |
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51 def trylock(self): |
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52 running_pid = False |
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53 try: |
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54 pidfile = open(self.pidfile, "r") |
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55 pidfile.seek(0) |
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56 running_pid = pidfile.readline() |
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57 if self.debug: |
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58 print 'lock file present running_pid: %s, checking for execution'\ |
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59 % running_pid |
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60 # Now we check the PID from lock file matches to the current |
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61 # process PID |
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62 if running_pid: |
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63 if os.path.exists("/proc/%s" % running_pid): |
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64 print "You already have an instance of the program running" |
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65 print "It is running as process %s" % running_pid |
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66 raise LockHeld |
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67 else: |
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68 print "Lock File is there but the program is not running" |
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69 print "Removing lock file for the: %s" % running_pid |
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70 self.release() |
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71 except IOError, e: |
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72 if e.errno != 2: |
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73 raise |
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74 |
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75 |
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76 def release(self): |
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77 """releases the pid by removing the pidfile |
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78 """ |
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79 if self.callbackfn: |
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80 #execute callback function on release |
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81 if self.debug: |
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82 print 'executing callback function %s' % self.callbackfn |
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83 self.callbackfn() |
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84 try: |
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85 if self.debug: |
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86 print 'removing pidfile %s' % self.pidfile |
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87 os.remove(self.pidfile) |
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88 self.held = False |
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89 except OSError, e: |
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90 if self.debug: |
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91 print 'removing pidfile failed %s' % e |
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92 pass |
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93 |
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94 def makelock(self, lockname, pidfile): |
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95 """ |
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96 this function will make an actual lock |
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97 @param lockname: acctual pid of file |
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98 @param pidfile: the file to write the pid in |
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99 """ |
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100 if self.debug: |
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101 print 'creating a file %s and pid: %s' % (pidfile, lockname) |
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102 pidfile = open(self.pidfile, "wb") |
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103 pidfile.write(lockname) |
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104 pidfile.close |
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105 self.held = True |