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scheduler.py
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scheduler.py
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# coding=utf-8
from __future__ import division
from __future__ import unicode_literals
import datetime
import logging
import threading
import time
from medusa import exception_handler
from medusa.logger.adapters.style import BraceAdapter
log = BraceAdapter(logging.getLogger(__name__))
log.logger.addHandler(logging.NullHandler())
class Scheduler(threading.Thread):
def __init__(self, action, cycleTime=datetime.timedelta(minutes=10), start_time=None,
threadName='ScheduledThread', silent=True):
super(Scheduler, self).__init__()
self.action = action
self.cycleTime = cycleTime if start_time is None else datetime.timedelta(days=1)
self.start_time = start_time
self.lastRun = datetime.datetime.now()
self.name = threadName
self.silent = silent
self.stop = threading.Event()
self.force = False
self.enable = False
def timeLeft(self):
"""
Check how long we have until we run again.
:return: timedelta
"""
if self.is_alive():
if self.start_time is None:
return self.cycleTime - (datetime.datetime.now() - self.lastRun)
else:
last_run = self.lastRun
start_time_next = datetime.datetime.combine(last_run.date(), self.start_time)
if last_run > start_time_next:
start_time_next += self.cycleTime
return start_time_next - datetime.datetime.now()
else:
return datetime.timedelta(seconds=0)
def forceRun(self):
if not self.action.amActive:
self.force = True
return True
return False
def run(self):
"""Run the thread."""
try:
while not self.stop.is_set():
if self.enable:
should_run = False
time_left = self.timeLeft()
# Is self.force enable
if self.force:
should_run = True
# check if interval has passed
elif time_left.total_seconds() <= 0:
should_run = True
if should_run:
if not self.silent:
log.debug('Starting new thread: {name}', {'name': self.name})
self.action.run(self.force)
self.lastRun = datetime.datetime.now()
if self.force:
self.force = False
time.sleep(1)
# exiting thread
self.stop.clear()
except Exception as e:
exception_handler.handle(e)