晋太元中，武陵人捕鱼为业。缘溪行，忘路之远近。忽逢桃花林，夹岸数百步，中无杂树，芳草鲜美，落英缤纷。渔人甚异之，复前行，欲穷其林。 　　林尽水源，便得一山，山有小口，仿佛若有光。便舍船，从口入。初极狭，才通人。复行数十步，豁然开朗。土地平旷，屋舍俨然，有良田、美池、桑竹之属。阡陌交通，鸡犬相闻。其中往来种作，男女衣着，悉如外人。黄发垂髫，并怡然自乐。 　　见渔人，乃大惊，问所从来。具答之。便要还家，设酒杀鸡作食。村中闻有此人，咸来问讯。自云先世避秦时乱，率妻子邑人来此绝境，不复出焉，遂与外人间隔。问今是何世，乃不知有汉，无论魏晋。此人一一为具言所闻，皆叹惋。余人各复延至其家，皆出酒食。停数日，辞去。此中人语云：“不足为外人道也。”(间隔 一作：隔绝) 　　既出，得其船，便扶向路，处处志之。及郡下，诣太守，说如此。太守即遣人随其往，寻向所志，遂迷，不复得路。 　　南阳刘子骥，高尚士也，闻之，欣然规往。未果，寻病终。后遂无问津者。 .
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Directory :  /opt/imunify360/venv/lib/python3.11/site-packages/defence360agent/plugins/

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Current File : //opt/imunify360/venv/lib/python3.11/site-packages/defence360agent/plugins/checkpoint.py
from defence360agent.contracts.plugins import MessageSink
from defence360agent.model.instance import db
from defence360agent.utils import recurring_check


class Checkpoint(MessageSink):
    """
    Checkpoint imunify360.db periodically to limit unexpected WAL file growing.
    """

    ONE_DAY = 24 * 60 * 60

    def __init__(self, *, checkpoint_period=ONE_DAY, db=db):
        self._checkpoint_period = checkpoint_period
        self._db = db
        self._task = None

    async def create_sink(self, loop):
        self._loop = loop
        self._task = self._loop.create_task(
            recurring_check(self._checkpoint_period)(self._checkpoint)()
        )

    async def shutdown(self):
        task, self._task = self._task, None  # avoid cancelling twice
        if task is None or task.cancelled():
            return
        task.cancel()
        # CancelledError is handled by @recurring_check():
        await task

    async def _checkpoint(self):
        # 1. may not shrink database wal file in case of this command will be
        # during external read process took place
        # 2. returning immediately without result if database
        # has concurrent transaction
        self._db.execute_sql("PRAGMA wal_checkpoint(TRUNCATE)")

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