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- from crontab import CronTab
- from crontab import CronSlices
- from core.ConfigurationManager.BrainLoader import BrainLoader
- from core.Models import Event
- import logging
- class InvalidCrontabPeriod(Exception):
- pass
- CRONTAB_COMMENT = "JARVIS"
- class CrontabManager:
- def __init__(self, brain_file=None):
- self.my_user_cron = CronTab(user=True)
- self.base_command = "/path/to/jarvis/"
- self.brain = BrainLoader(filename=brain_file).get_brain()
- def load_events_in_crontab(self):
- """
- Remove all line in crontab with the CRONTAB_COMMENT
- Then add back line from event in the brain.yml
- :return:
- """
- # clean the current crontab from all jarvis event
- self._remove_all_jarvis_job()
- # load the brain file
- for synapse in self.brain.synapes:
- for signal in synapse.signals:
- # print signal
- # if the signal is an event we add it to the crontab
- if type(signal) == Event:
- # for all synapse with an event, we add the task id to the crontab
- self._add_event(period_string=signal.period, event_id=signal.identifier)
- def _add_event(self, period_string, event_id):
- my_user_cron = CronTab(user=True)
- job = my_user_cron.new(command=self.base_command+" "+str(event_id), comment=CRONTAB_COMMENT)
- if CronSlices.is_valid(period_string):
- job.setall(period_string)
- job.enable()
- else:
- raise InvalidCrontabPeriod("The crontab period %s is not valid" % period_string)
- # write the file
- my_user_cron.write()
- def get_jobs(self):
- return self.my_user_cron.find_comment(CRONTAB_COMMENT)
- def _remove_all_jarvis_job(self):
- """
- Remove all line in crontab that are attached to JARVIS
- :return:
- """
- iter = self.my_user_cron.find_comment(CRONTAB_COMMENT)
- for job in iter:
- logging.debug("remove job %s from crontab" % job)
- self.my_user_cron.remove(job)
- # write the file
- self.my_user_cron.write()
- # this is a fix for the CronTab lib
- # see https://github.com/peak6/python-crontab/issues/1
- new_iter = self.my_user_cron.find_comment(CRONTAB_COMMENT)
- sum_job = sum(1 for _ in new_iter)
- while sum_job > 0:
- self._remove_all_jarvis_job()
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