def periodic_callback(self):
# save statistics values
for topo in self.topologies.values():
stats = topo.get_stats()
if not stats.save_if_changed() and stats.get_idle_time_sec() > MAX_INACTIVE_TOPOLOGY_LIFE_SEC:
self.stop_topology(topo, 'topology exceeded maximum idle time (%dsec)' % MAX_INACTIVE_TOPOLOGY_LIFE_SEC)
elif stats.get_num_sec_connected() > MAX_TOPOLOGY_LIFE_SEC:
self.stop_topology(topo, 'topology exceeded maximum lifetime (%dsec)' % MAX_TOPOLOGY_LIFE_SEC)
# see if there is any admin message to be sent to all clients
try:
bts = db.SystemInfo.objects.get(name='banner_to_send')
msg_for_clients = bts.value
bts.delete()
logging.info('sending message to clients: %s' % msg_for_clients)
for conn in self.clients.keys():
for m in VNSBanner.get_banners(msg_for_clients):
conn.send(m)
except db.SystemInfo.DoesNotExist:
pass
# note in the db that the reactor thread is still running
try:
latest = db.SystemInfo.objects.get(name='last_alive_time')
except db.SystemInfo.DoesNotExist:
latest = db.SystemInfo()
latest.name = 'last_alive_time'
latest.value = str(int(time()))
latest.save()
reactor.callLater(30, self.periodic_callback)
def send_motd_to_client(self, conn):
"""Sends a message to a newly connected client, if such a a message is set."""
# see if there is any admin message to be sent to a client upon connecting
try:
msg_for_client = DBService.run_and_wait(lambda: db.SystemInfo.objects.get(name='motd')).value
logging.info('sending message to clients: %s' % msg_for_client)
for m in VNSBanner.get_banners(msg_for_client):
conn.send(m)
except db.SystemInfo.DoesNotExist:
pass
def send_motd_to_client(self, conn):
"""Sends a message to a newly connected client, if such a a message is set."""
# see if there is any admin message to be sent to a client upon connecting
try:
msg_for_client = db.SystemInfo.objects.get(name='motd').value
logging.info('sending message to clients: %s' % msg_for_client)
for m in VNSBanner.get_banners(msg_for_client):
conn.send(m)
except db.SystemInfo.DoesNotExist:
pass
def periodic_callback(self):
# save statistics values
for topo in self.topologies.values():
stats = topo.get_stats()
stats_deferred = DBService.run_in_db_thread(stats.save_if_changed)
stats_deferred.addCallback(lambda c: self.__stop_topo_if_necessary(topo, c))
# see if there is any admin message to be sent to all clients
try:
bts = DBService.run_and_wait(db.SystemInfo.objects.get(name='banner_to_send'))
msg_for_clients = bts.value
bts.delete()
logging.info('sending message to clients: %s' % msg_for_clients)
for conn in self.clients.keys():
for m in VNSBanner.get_banners(msg_for_clients):
conn.send(m)
except db.SystemInfo.DoesNotExist:
pass
# note in the db that the reactor thread is still running
def __update_reactor_alive_time():
try:
latest = db.SystemInfo.objects.get(name='last_alive_time')
except db.SystemInfo.DoesNotExist:
latest = db.SystemInfo()
latest.name = 'last_alive_time'
latest.value = str(int(time()))
latest.save()
DBService.run_in_db_thread(__update_reactor_alive_time)
# see if there are any topologies to be deleted
jtd = DBService.run_and_wait(db.JournalTopologyDelete.objects.all)
for je in jtd:
try:
topo = self.topologies[je.topology.id]
except KeyError:
# this topology is not in use, we can just delete it from
# the db - this also deletes the journal entry
DBService.run_in_db_thread(je.topology.delete)
else:
# the topology is in use; stop it and then delete it
self.stop_topology(topo, "topology has been deleted")
DBService.run_in_db_thread(je.topology.delete)
reactor.callLater(30, self.periodic_callback)
