def bind_router(self, context, router_id, chosen_agent):
"""Bind the router to the l3 agent which has been chosen."""
try:
with context.session.begin(subtransactions=True):
binding = l3_agentschedulers_db.RouterL3AgentBinding()
binding.l3_agent = chosen_agent
binding.router_id = router_id
context.session.add(binding)
except db_exc.DBDuplicateEntry:
LOG.debug(
'Router %(router_id)s has already been scheduled '
'to L3 agent %(agent_id)s.', {
'agent_id': chosen_agent.id,
'router_id': router_id
})
return
except db_exc.DBReferenceError:
LOG.debug(
'Router %s has already been removed '
'by concurrent operation', router_id)
return
LOG.debug(
'Router %(router_id)s is scheduled to L3 agent '
'%(agent_id)s', {
'router_id': router_id,
'agent_id': chosen_agent.id
})
def bind_dvr_router_servicenode(self, context, router_id,
chosen_snat_agent):
"""Bind the IR router to service node if not already hosted."""
query = (context.session.query(
l3agent_sch_db.RouterL3AgentBinding).filter_by(
router_id=router_id))
for bind in query:
if bind.l3_agent_id == chosen_snat_agent.id:
LOG.debug(
'Distributed Router %(router_id)s already hosted '
'on snat l3_agent %(snat_id)s', {
'router_id': router_id,
'snat_id': chosen_snat_agent.id
})
return
with context.session.begin(subtransactions=True):
binding = l3agent_sch_db.RouterL3AgentBinding()
binding.l3_agent = chosen_snat_agent
binding.router_id = router_id
context.session.add(binding)
LOG.debug(
'Binding the distributed router %(router_id)s to '
'the snat agent %(snat_id)s', {
'router_id': router_id,
'snat_id': chosen_snat_agent.id
})
def _binding_router_to_agent(self, context, router_ids, agent_id):
for r_id in router_ids:
LOG.debug('_binding_router_to_agent, process:%s-%s' %
(r_id, agent_id))
query = context.session.query(l3_agentschedulers_db.
RouterL3AgentBinding)
query = query.filter(l3_agentschedulers_db.RouterL3AgentBinding.
router_id == r_id,
l3_agentschedulers_db.RouterL3AgentBinding.
l3_agent_id == agent_id)
try:
query.one()
LOG.debug('find old router_agent_binding %s-%s '
% (r_id, agent_id))
except sa_exc.NoResultFound:
with context.session.begin(subtransactions=True):
binding = l3_agentschedulers_db.RouterL3AgentBinding()
binding.l3_agent_id = agent_id
binding.router_id = r_id
try:
context.session.add(binding)
LOG.debug('add router_agent_binding %s-%s'
% (r_id, agent_id))
except db_exc.DBError:
LOG.debug('add router_agent_binding %s-%s fail'
% (r_id, agent_id))
def bind_router(self, context, router_id, chosen_agent):
"""Bind the router to the l3 agent which has been chosen."""
with context.session.begin(subtransactions=True):
binding = l3_agentschedulers_db.RouterL3AgentBinding()
binding.l3_agent = chosen_agent
binding.router_id = router_id
context.session.add(binding)
LOG.debug(_('Router %(router_id)s is scheduled to '
'L3 agent %(agent_id)s'),
{'router_id': router_id,
'agent_id': chosen_agent.id})
def bind_router(self,
context,
router_id,
chosen_agent,
binding_index=l3_agentschedulers_db.LOWEST_BINDING_INDEX):
"""Bind the router to the l3 agent which has been chosen."""
# Pre-cache the agent's id so that if an exception is raised we can
# safely access its value. Otherwise, sqlalchemy will try to fetch it
# from the database during a rollback, which is bad for us.
agent_id = chosen_agent.id
try:
with context.session.begin(subtransactions=True):
binding = l3_agentschedulers_db.RouterL3AgentBinding()
binding.l3_agent = chosen_agent
binding.router_id = router_id
binding.binding_index = binding_index
context.session.add(binding)
except db_exc.DBDuplicateEntry as error:
LOG.debug(
'Router %(router_id)s has already been scheduled '
'to L3 agent %(agent_id)s (tried to bind with '
'binding_index %(binding_index)d). The conflict was '
'with columns %(columns)r.', {
'agent_id': agent_id,
'router_id': router_id,
'binding_index': binding_index,
'columns': error.columns
})
return
except db_exc.DBReferenceError:
LOG.debug(
'Router %s has already been removed '
'by concurrent operation', router_id)
return
LOG.debug(
'Router %(router_id)s is scheduled to L3 agent '
'%(agent_id)s with binding_index %(binding_index)d', {
'router_id': router_id,
'agent_id': agent_id,
'binding_index': binding_index
})
return binding
def schedule(self, plugin, context, router_id):
"""Schedule the router to an active L3 agent if there
is no enable L3 agent hosting it.
"""
with context.session.begin(subtransactions=True):
# allow one router is hosted by just
# one enabled l3 agent hosting since active is just a
# timing problem. Non-active l3 agent can return to
# active any time
l3_agents = plugin.get_l3_agents_hosting_routers(
context, [router_id], admin_state_up=True)
if l3_agents:
LOG.debug(
_('Router %(router_id)s has already been hosted'
' by L3 agent %(agent_id)s'), {
'router_id': router_id,
'agent_id': l3_agents[0]['id']
})
return
sync_router = plugin.get_router(context, router_id)
active_l3_agents = plugin.get_l3_agents(context, active=True)
if not active_l3_agents:
LOG.warn(_('No active L3 agents'))
return
candidates = plugin.get_l3_agent_candidates(
sync_router, active_l3_agents)
if not candidates:
LOG.warn(_('No L3 agents can host the router %s'),
sync_router['id'])
return
chosen_agent = random.choice(candidates)
binding = l3_agentschedulers_db.RouterL3AgentBinding()
binding.l3_agent = chosen_agent
binding.router_id = sync_router['id']
context.session.add(binding)
LOG.debug(
_('Router %(router_id)s is scheduled to '
'L3 agent %(agent_id)s'), {
'router_id': sync_router['id'],
'agent_id': chosen_agent['id']
})
return chosen_agent
def auto_schedule_routers(self, plugin, context, host, router_ids):
"""Schedule non-hosted routers to L3 Agent running on host.
If router_ids is given, each router in router_ids is scheduled
if it is not scheduled yet. Otherwise all unscheduled routers
are scheduled.
Don't schedule the routers which are hosted already
by active l3 agents.
"""
with context.session.begin(subtransactions=True):
# query if we have valid l3 agent on the host
query = context.session.query(agents_db.Agent)
query = query.filter(
agents_db.Agent.agent_type == constants.AGENT_TYPE_L3,
agents_db.Agent.host == host,
agents_db.Agent.admin_state_up == True)
try:
l3_agent = query.one()
except (exc.MultipleResultsFound, exc.NoResultFound):
LOG.debug(_('No enabled L3 agent on host %s'), host)
return False
if agents_db.AgentDbMixin.is_agent_down(
l3_agent.heartbeat_timestamp):
LOG.warn(_('L3 agent %s is not active'), l3_agent.id)
# check if each of the specified routers is hosted
if router_ids:
unscheduled_router_ids = []
for router_id in router_ids:
l3_agents = plugin.get_l3_agents_hosting_routers(
context, [router_id], admin_state_up=True)
if l3_agents:
LOG.debug(
_('Router %(router_id)s has already been'
' hosted by L3 agent %(agent_id)s'), {
'router_id': router_id,
'agent_id': l3_agents[0]['id']
})
else:
unscheduled_router_ids.append(router_id)
if not unscheduled_router_ids:
# all (specified) routers are already scheduled
return False
else:
# get all routers that are not hosted
#TODO(gongysh) consider the disabled agent's router
stmt = ~exists().where(l3_db.Router.id == l3_agentschedulers_db
.RouterL3AgentBinding.router_id)
unscheduled_router_ids = [
router_id_[0] for router_id_ in context.session.query(
l3_db.Router.id).filter(stmt)
]
if not unscheduled_router_ids:
LOG.debug(_('No non-hosted routers'))
return False
# check if the configuration of l3 agent is compatible
# with the router
routers = plugin.get_routers(
context, filters={'id': unscheduled_router_ids})
to_removed_ids = []
for router in routers:
candidates = plugin.get_l3_agent_candidates(router, [l3_agent])
if not candidates:
to_removed_ids.append(router['id'])
router_ids = set([r['id'] for r in routers]) - set(to_removed_ids)
if not router_ids:
LOG.warn(
_('No routers compatible with L3 agent configuration'
' on host %s'), host)
return False
# binding
for router_id in router_ids:
binding = l3_agentschedulers_db.RouterL3AgentBinding()
binding.l3_agent = l3_agent
binding.router_id = router_id
binding.default = True
context.session.add(binding)
return True
def schedule(self, plugin, context, router_id):
"""Schedule the router to the least utilized active L3 agent
if there is no enable L3 agent hosting it.
"""
with context.session.begin(subtransactions=True):
# allow one router is hosted by just
# one enabled l3 agent hosting since active is just a
# timing problem. Non-active l3 agent can return to
# active any time
# get router object from router_id
sync_router = plugin.get_router(context, router_id)
l3_agents = plugin.get_l3_agents_hosting_routers(
context, [sync_router['id']], admin_state_up=True)
if l3_agents:
LOG.debug(_('Router %(router_id)s has already been hosted'
' by L3 agent %(agent_id)s'),
{'router_id': sync_router['id'],
'agent_id': l3_agents[0]['id']})
return
active_l3_agents = plugin.get_l3_agents(context, active=True)
if not active_l3_agents:
LOG.warn(_('No active L3 agents'))
return
candidates = plugin.get_l3_agent_candidates(sync_router,
active_l3_agents)
if not candidates:
LOG.warn(_('No L3 agents can host the router %s'),
sync_router['id'])
return
for candidate in candidates:
routers = plugin.list_routers_on_l3_agent(context,
candidate['id'])
LOG.debug(_('Router Scheduler found router hosted count='
'%(router_count)s s for agent_id=%(agent_id)s'),
{'router_count': len(routers['routers']),
'agent_id': candidate['id']})
candidate['router_count'] = len(routers['routers'])
ordered_agents = sorted(candidates, key=lambda k: k['router_count'])
chosen_agent = None
for l3_agent in ordered_agents:
if agents_db.AgentDbMixin.is_agent_down(l3_agent.heartbeat_timestamp):
LOG.debug(_('Router Skipping Preferred agent_id=%s which is down'), l3_agent['id'])
continue
else:
chosen_agent = l3_agent
# make sure the agent with the least hosted routers is chosen
break
LOG.debug(_('Router Scheduler choosing agent=%r'), chosen_agent)
binding = l3_agentschedulers_db.RouterL3AgentBinding()
binding.l3_agent = chosen_agent
binding.router_id = sync_router['id']
context.session.add(binding)
LOG.debug(_('Router %(router_id)s is scheduled to '
'L3 agent %(agent_id)s'),
{'router_id': sync_router['id'],
'agent_id': chosen_agent['id']})
return chosen_agent
def auto_schedule_routers(self, plugin, context, host, router_ids):
"""Schedule non-hosted routers to L3 Agent running on host.
If router_ids is given, each router in router_ids is scheduled
if it is not scheduled yet. Otherwise all unscheduled routers
are scheduled.
Don't schedule the routers which are hosted already
by active l3 agents.
"""
with context.session.begin(subtransactions=True):
# query if we have valid l3 agent on the host
query = context.session.query(agents_db.Agent)
query = query.filter(agents_db.Agent.agent_type ==
constants.AGENT_TYPE_L3,
agents_db.Agent.admin_state_up == True)
agents = []
for agent in query.all():
router_query = context.session.query(l3_agentschedulers_db.RouterL3AgentBinding)
router_count = router_query.filter(l3_agentschedulers_db.RouterL3AgentBinding.l3_agent_id == agent['id']).count()
agent['router_count'] = router_count
agents.append(agent)
LOG.debug(_('Router Scheduler found router hosted count='
'%(router_count)s s for agent_id=%(agent_id)s'),
{'router_count': agent['router_count'],
'agent_id': agent['id']})
if not agents:
LOG.debug(_('No enabled L3 agents available to schedule to'))
return False
ordered_agents = sorted(agents, key=lambda k: k['router_count'])
l3_agent = None
for chosen_agent in ordered_agents:
if agents_db.AgentDbMixin.is_agent_down(chosen_agent.heartbeat_timestamp):
LOG.debug(_('Router Skipping Preferred agent_id=%s which is down'), chosen_agent['id'])
continue
else:
l3_agent = chosen_agent
# make sure the agent with the least hosted routers is chosen
break
LOG.debug(_('Router Scheduler choosing agent_id=%s'), l3_agent['id'])
if agents_db.AgentDbMixin.is_agent_down(
l3_agent.heartbeat_timestamp):
LOG.warn(_('L3 agent %s is not active'), l3_agent.id)
# check if each of the specified routers is hosted
if router_ids:
if not isinstance(router_ids, (list, tuple)):
router_ids = [router_ids]
unscheduled_router_ids = []
for router_id in router_ids:
l3_agents = plugin.get_l3_agents_hosting_routers(
context, [router_id], admin_state_up=True)
if l3_agents:
LOG.debug(_('Router %(router_id)s has already been'
' hosted by L3 agent %(agent_id)s'),
{'router_id': router_id,
'agent_id': l3_agents[0]['id']})
else:
unscheduled_router_ids.append(router_id)
LOG.info(_("Router is appending router_id=%r to unscheduled_router_ids"), router_id)
if not unscheduled_router_ids:
# all (specified) routers are already scheduled
return False
else:
# get all routers that are not hosted
#TODO(gongysh) consider the disabled agent's router
stmt = ~exists().where(
l3_db.Router.id ==
l3_agentschedulers_db.RouterL3AgentBinding.router_id)
unscheduled_router_ids = [router_id_[0] for router_id_ in
context.session.query(
l3_db.Router.id).filter(stmt)]
if not unscheduled_router_ids:
LOG.debug(_('No non-hosted routers'))
return False
else:
LOG.info(_("Router RouterL3AgentBinding returned unscheduled_router_ids=%r"), unscheduled_router_ids)
# check if the configuration of l3 agent is compatible
# with the router
routers = plugin.get_routers(
context, filters={'id': unscheduled_router_ids})
to_removed_ids = []
for router in routers:
candidates = plugin.get_l3_agent_candidates(router, [l3_agent])
if not candidates:
to_removed_ids.append(router['id'])
router_ids = set(unscheduled_router_ids) - set(to_removed_ids)
if not router_ids:
LOG.warn(_('No routers compatible with L3 agent configuration'
' on host %s'), host)
return False
# binding
for router_id in router_ids:
LOG.info(_("Router iterating over router_ids=%r and got router_id=%s" % (router_ids, router_id)))
binding = l3_agentschedulers_db.RouterL3AgentBinding()
binding.l3_agent = l3_agent
binding.router_id = router_id
binding.default = True
context.session.add(binding)
return True
