def expire_servers(self, timeout):
"""set servers whose last_updated is before current - timeout as dead
"""
from sqlalchemy.sql.expression import func, text
Server = tables.Server
OnAir = tables.OnAir
now = tables.now_func()
if isinstance(now, datetime.datetime):
deadline = now - datetime.timedelta(seconds=timeout)
else:
deadline = func.timestampadd(text('second'), -timeout, now)
query = self.session \
.query(Server.id) \
.filter(Server.alive) \
.filter(Server.last_updated < deadline)
# delete on airs of broadcast server
broadcasts = query \
.filter_by(type='broadcast') \
.subquery()
self.session \
.query(OnAir) \
.filter(OnAir.server_id.in_(broadcasts)) \
.delete('fetch')
# update server state to dead
count = query.count()
query.update(dict(alive=False), False)
self.session.flush()
self.logger.info('Expire %s servers', count)
def expire_hosts(self, timeout):
"""set hosts whose last_updated is before current - timeout as dead
"""
from sqlalchemy.sql.expression import func, text
Host = tables.Host
# delete out-dated hosts
# func.timestampadd()
now = tables.now_func()
if isinstance(now, datetime.datetime):
deadline = now - datetime.timedelta(seconds=timeout)
else:
deadline = func.timestampadd(text('second'), -timeout, now)
query = self.session \
.query(Host) \
.filter(Host.alive) \
.filter(Host.last_updated < deadline)
count = query.count()
query.update(dict(alive=False), False)
self.session.flush()
self.logger.info('Expire %s hosts', count)
