annotate bin/jobdaemon.py @ 472:d760c6cd2abf

Source package created means we are still progressing
author Andre Heinecke <aheinecke@intevation.de>
date Fri, 10 Sep 2010 10:18:31 +0000
parents c1d5a6cb5cb0
children
rev   line source
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1 #!/usr/bin/env python
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2
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3 import os.path
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4 import sys
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5 import shlex
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6 import traceback
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7 import time
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8
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9 from optparse import OptionParser
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10
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11 CONFIG_FILE = os.environ.get("JOBDAEMON_CFG", "jobdaemon.cfg")
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12
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13 SLEEP = int(os.environ.get("JOBDAEMON_SLEEP", "60"))
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14
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15 def fork(job):
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16 pid = os.fork()
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17 if pid: return pid
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18 os.execv(job[0], job)
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19 return -1 # never reached
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20
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21 class Jobs(object):
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22
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23 def __init__(self, filename):
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24 self.load_config(filename)
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25
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26 def load_config(self, filename):
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27 print >> sys.stderr, "loading config file '%s'" % filename
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28 plan, jobs = [], []
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29 f = open(filename, "r")
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30 try:
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31 while True:
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32 line = f.readline()
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33 if not line: break
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34 line = line.strip()
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35 if not line or line.startswith("#"):
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36 continue
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37 if line.startswith("BLOCKER:"):
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38 line = line[len("BLOCKER:"):].strip()
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39 plan.append((jobs, line))
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40 jobs = []
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41 continue
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42 jobs.append(shlex.split(line))
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43 finally:
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44 f.close()
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45
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46 if jobs: plan.append((jobs, None))
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47
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48 self.plan = plan
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49
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50 def run_jobs(self, jobs):
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51 pids = []
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52 for job in jobs:
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53 try:
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54 pids.append(fork(job))
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55 except:
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56 traceback.print_exc()
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57
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58 for pid in pids:
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59 try:
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60 os.waitpid(pid, 0)
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61 except:
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62 traceback.print_exc()
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63
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64 def run(self):
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65 for jobs, blocker in self.plan:
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66 self.run_jobs(jobs)
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67 if blocker:
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68 try:
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69 os.system(blocker)
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70 except:
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71 traceback.print_exc()
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72
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73 def main():
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74
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75 global config_changed
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76
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77 parser = OptionParser()
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78
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79 parser.add_option(
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80 "-c", "--config", dest="config",
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81 help="load configuration from file",
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82 metavar="FILE", default=CONFIG_FILE)
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83
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84 parser.add_option(
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85 "-s", "--sleep", dest="sleep_time",
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86 help="sleep time between runs",
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87 type="int",
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88 metavar="TIME", default=SLEEP)
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89
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90 (options, _) = parser.parse_args()
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91
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92 if not os.path.isfile(options.config):
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93 print >> sys.stderr, "config file '%s' does not exists."
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94 sys.exit(1)
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95
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96 modtime = os.stat(options.config).st_mtime
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97
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98 jobs = Jobs(options.config)
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99
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100 while True:
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101 if os.path.isfile(options.config):
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102 nmodtime = os.stat(options.config).st_mtime
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103 if nmodtime > modtime:
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104 modtime = nmodtime
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105 jobs = Jobs(options.config)
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106 jobs.run()
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107 time.sleep(options.sleep_time)
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108
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109 if __name__ == '__main__':
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110 main()
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