Mercurial > kallithea
annotate pylons_app/lib/indexers/pidlock.py @ 406:b153a51b1d3b
Implemented search using whoosh. Still as experimental option.
author | Marcin Kuzminski <marcin@python-works.com> |
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date | Tue, 17 Aug 2010 23:15:36 +0200 |
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406
b153a51b1d3b
Implemented search using whoosh. Still as experimental option.
Marcin Kuzminski <marcin@python-works.com>
parents:
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1 import os, time |
b153a51b1d3b
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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 = lock() |
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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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43 ''' |
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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()) |
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47 |
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48 self.trylock() |
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49 self.makelock(lockname, self.pidfile) |
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50 return True |
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51 |
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52 def trylock(self): |
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53 running_pid = False |
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54 try: |
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55 pidfile = open(self.pidfile, "r") |
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56 pidfile.seek(0) |
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57 running_pid = pidfile.readline() |
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58 if self.debug: |
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59 print 'lock file present running_pid: %s, checking for execution'\ |
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60 % running_pid |
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61 # Now we check the PID from lock file matches to the current |
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62 # process PID |
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63 if running_pid: |
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64 if os.path.exists("/proc/%s" % running_pid): |
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65 print "You already have an instance of the program running" |
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66 print "It is running as process %s" % running_pid |
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67 raise LockHeld |
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68 else: |
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69 print "Lock File is there but the program is not running" |
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70 print "Removing lock file for the: %s" % running_pid |
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71 self.release() |
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72 except IOError, e: |
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73 if e.errno != 2: |
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74 raise |
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75 |
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76 |
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77 def release(self): |
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78 ''' |
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79 releases the pid by removing the pidfile |
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80 ''' |
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81 if self.callbackfn: |
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82 #execute callback function on release |
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83 if self.debug: |
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84 print 'executing callback function %s' % self.callbackfn |
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85 self.callbackfn() |
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86 try: |
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87 if self.debug: |
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88 print 'removing pidfile %s' % self.pidfile |
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89 os.remove(self.pidfile) |
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90 self.held = False |
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91 except OSError, e: |
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92 if self.debug: |
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93 print 'removing pidfile failed %s' % e |
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94 pass |
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95 |
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96 def makelock(self, lockname, pidfile): |
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97 ''' |
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98 this function will make an actual lock |
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99 @param lockname: acctual pid of file |
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100 @param pidfile: the file to write the pid in |
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101 ''' |
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102 if self.debug: |
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103 print 'creating a file %s and pid: %s' % (pidfile, lockname) |
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104 pidfile = open(self.pidfile, "wb") |
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105 pidfile.write(lockname) |
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106 pidfile.close |
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107 self.held = True |
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108 |
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109 |
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110 def main(): |
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111 print 'func is running' |
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112 cnt = 20 |
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113 while 1: |
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114 print cnt |
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115 if cnt == 0: |
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116 break |
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117 time.sleep(1) |
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118 cnt -= 1 |
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119 |
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120 |
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121 if __name__ == "__main__": |
b153a51b1d3b
Implemented search using whoosh. Still as experimental option.
Marcin Kuzminski <marcin@python-works.com>
parents:
diff
changeset
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122 try: |
b153a51b1d3b
Implemented search using whoosh. Still as experimental option.
Marcin Kuzminski <marcin@python-works.com>
parents:
diff
changeset
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123 l = DaemonLock(desc='test lock') |
b153a51b1d3b
Implemented search using whoosh. Still as experimental option.
Marcin Kuzminski <marcin@python-works.com>
parents:
diff
changeset
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124 main() |
b153a51b1d3b
Implemented search using whoosh. Still as experimental option.
Marcin Kuzminski <marcin@python-works.com>
parents:
diff
changeset
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125 l.release() |
b153a51b1d3b
Implemented search using whoosh. Still as experimental option.
Marcin Kuzminski <marcin@python-works.com>
parents:
diff
changeset
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126 except LockHeld: |
b153a51b1d3b
Implemented search using whoosh. Still as experimental option.
Marcin Kuzminski <marcin@python-works.com>
parents:
diff
changeset
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127 sys.exit(1) |