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#!/usr/bin/python -S
#
# Copyright 2010 Canonical Ltd. This software is licensed under the
# GNU Affero General Public License version 3 (see the file LICENSE).
"""Calculate database replication lag and cache it."""
__metaclass__ = type
__all__ = []
import _pythonpath
import sys
import time
import psycopg2
from canonical.database.sqlbase import connect, ISOLATION_LEVEL_AUTOCOMMIT
from canonical.launchpad.scripts import db_options, logger
from lp.scripts.helpers import LPOptionParser
def main(args=None):
parser = LPOptionParser()
db_options(parser)
parser.add_option(
"-s", "--sleep", dest="sleep", type="int", default=5,
metavar="SECS", help="Wait SECS seconds between refreshes.")
(options, args) = parser.parse_args(args)
if len(args) != 0:
parser.error("Too many arguments.")
log = logger(options)
while True:
try:
con = connect(user="lagmon", isolation=ISOLATION_LEVEL_AUTOCOMMIT)
cur = con.cursor()
while True:
cur.execute("SELECT update_replication_lag_cache()")
if cur.fetchone()[0]:
log.info("Updated.")
else:
log.error("update_replication_lag_cache() failed.")
time.sleep(options.sleep)
except psycopg2.Error, x:
log.error("%s. Retrying.", str(x).strip())
time.sleep(options.sleep)
if __name__ == '__main__':
sys.exit(main())
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