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Mini Shell
# coding=utf-8
#
# Copyright © Cloud Linux GmbH & Cloud Linux Software, Inc 2010-2019 All Rights Reserved
#
# Licensed under CLOUD LINUX LICENSE AGREEMENT
# http://cloudlinux.com/docs/LICENSE.TXT
from __future__ import absolute_import
from __future__ import division
from builtins import range
import os
import logging
import timeit
from sqlalchemy.orm import sessionmaker
from sqlalchemy.exc import OperationalError
from sqlalchemy import func
from lvestats.lib.commons.func import reboot_lock
from lvestats.core.plugin import LveStatsPlugin, LveStatsPluginTerminated
from lvestats.orm import history, history_x60, history_gov, incident
import lvestats.lib.snapshot
__author__ = 'shaman'
class HistoryCleaner(LveStatsPlugin):
def __init__(self):
self.period = 60 * 60 # 1 hour
self.batch = 6 * 60 * 60 # 6 hours
self.execute_timeout = 20
self.keep_history_days = 30 # 1 months to keep history, by default
self.db_engine = None
self.log = logging.getLogger('HistoryCleaner')
self.db_type = 'sqlite'
self.server_id = None
# db_type = mysql
# db_type = postgresql
def set_db_engine(self, engine):
self.db_engine = engine
def set_config(self, config):
self.keep_history_days = int(config.get('keep_history_days',
self.keep_history_days))
self.period = int(config.get('period', 60)) * 60
self.db_type = config.get('db_type', self.db_type)
self.server_id = config.get('server_id', 'localhost')
def time_threshold(self):
return int(self.now - self.keep_history_days*24*60*60)
@staticmethod
def clean_old_snapshots(ts_to):
for uid in os.listdir(lvestats.lib.snapshot.SNAPSHOT_PATH):
snap = lvestats.lib.snapshot.Snapshot({'uid': uid})
snap.delete_old(ts_to)
def execute(self, lve_data):
t_min = self.time_threshold()
# tables to clean: history, history_gov, incident, snapshot
self.log.debug('Records with timestamp less then %d will be erased' % t_min)
if os.path.exists(lvestats.lib.snapshot.SNAPSHOT_PATH):
self.clean_old_snapshots(t_min)
self.log.debug('Deleting old records from database')
with reboot_lock():
session = sessionmaker(bind=self.db_engine)()
start_time = timeit.default_timer()
try:
self.delete(session, history_x60, history_x60.created, t_min)
self.delete(session, history_gov, history_gov.ts, t_min)
self.delete(session, incident, incident.incident_end_time, t_min)
session.commit()
first_created = session.query(func.min(history.created)).filter(history.server_id == self.server_id).one()[0] or t_min
for iteration, timestamp in enumerate(range(int(first_created) + self.batch, int(t_min), self.batch)):
self.delete(session, history, history.created, timestamp)
session.commit()
if timeit.default_timer() - start_time > self.execute_timeout:
self.log.debug(
"Iterations: %s. Deleted: %sh",
iteration,
(timestamp - first_created) / (60 * 60))
break
else:
self.delete(session, history, history.created, t_min)
session.commit()
except OperationalError as e:
session.rollback()
self.log.warning(str(e))
except LveStatsPluginTerminated:
self.log.debug('Cleaner terminated. Trying to rollback')
session.rollback()
session.close()
raise LveStatsPluginTerminated()
finally:
elapsed = (timeit.default_timer() - start_time) * 1000 # Milliseconds
self.log.debug('Execution time: %d' % elapsed)
session.close()
def delete(self, session, table, ts_column, limit):
session.query(table) \
.filter(ts_column < limit, table.server_id == self.server_id) \
.delete(synchronize_session=False)
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