import logging
from app import app
from data.database import UseThenDisconnect, QueueItem
from workers.worker import Worker
from datetime import timedelta, datetime
logger = logging.getLogger(__name__)
DELETION_DATE_THRESHOLD = timedelta(days=7)
DELETION_COUNT_THRESHOLD = 50
BATCH_SIZE = 500
QUEUE_CLEANUP_FREQUENCY = app.config.get('QUEUE_CLEANUP_FREQUENCY', 60*60*24)
class QueueCleanupWorker(Worker):
def __init__(self):
super(QueueCleanupWorker, self).__init__()
self.add_operation(self._cleanup_queue, QUEUE_CLEANUP_FREQUENCY)
def _cleanup_queue(self):
""" Performs garbage collection on the queueitem table. """
with UseThenDisconnect(app.config):
while True:
# Find all queue items older than the threshold (typically a week) and delete them.
threshold_ago = datetime.now() - DELETION_DATE_THRESHOLD
to_delete = list(QueueItem.select()
.where(QueueItem.processing_expires <= threshold_ago)
.limit(BATCH_SIZE))
if len(to_delete) < DELETION_COUNT_THRESHOLD:
return
QueueItem.delete().where(QueueItem.id << to_delete).execute()
if __name__ == "__main__":
worker = QueueCleanupWorker()
worker.start()
