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75 lines
2.3 KiB
Python
75 lines
2.3 KiB
Python
import logging
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from datetime import datetime
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from threading import Timer, Event, Thread
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from time import sleep
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import pytz
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class CleanupTimer:
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"""Provides a timed cleanup of the spot list."""
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def __init__(self, spots, alerts, web_server, cleanup_interval):
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"""Constructor"""
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self.spots = spots
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self.alerts = alerts
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self.web_server = web_server
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self.cleanup_interval = cleanup_interval
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self.cleanup_timer = None
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self.last_cleanup_time = datetime.min.replace(tzinfo=pytz.UTC)
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self.status = "Starting"
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self._stop_event = Event()
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def start(self):
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"""Start the cleanup timer"""
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self._thread = Thread(target=self._run, daemon=True)
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self._thread.start()
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def stop(self):
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"""Stop any threads and prepare for application shutdown"""
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self._stop_event.set()
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def _run(self):
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while not self._stop_event.wait(timeout=self.cleanup_interval):
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self._cleanup()
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def _cleanup(self):
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"""Perform cleanup and reschedule next timer"""
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try:
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# Perform cleanup via letting the data expire
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self.spots.expire()
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self.alerts.expire()
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# Explicitly clean up any spots and alerts that have expired
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for id in list(self.spots.iterkeys()):
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try:
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spot = self.spots[id]
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if spot.expired():
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self.spots.delete(id)
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except KeyError:
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# Must have already been deleted, OK with that
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pass
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for id in list(self.alerts.iterkeys()):
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try:
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alert = self.alerts[id]
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if alert.expired():
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self.alerts.delete(id)
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except KeyError:
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# Must have already been deleted, OK with that
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pass
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# Clean up web server SSE spot/alert queues
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self.web_server.clean_up_sse_queues()
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self.status = "OK"
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self.last_cleanup_time = datetime.now(pytz.UTC)
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except Exception as e:
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self.status = "Error"
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logging.exception("Exception in Cleanup thread")
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self._stop_event.wait(timeout=1)
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