openstack/neutron
Code Issues Proposed changes

Merge "protect DHCP agent cache out of sync" into stable/pike

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Zuul 2019-01-24 00:43:17 +00:00 committed by Gerrit Code Review
commit 9799e9ae04
2 changed files with 80 additions and 35 deletions
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80
neutron/agent/dhcp/agent.py
View File

@ -428,42 +428,62 @@ class DhcpAgent(manager.Manager):
network = self.cache.get_network_by_id(updated_port.network_id)
if not network:
return
LOG.info("Trigger reload_allocations for port %s",
updated_port)
driver_action = 'reload_allocations'
if self._is_port_on_this_agent(updated_port):
orig = self.cache.get_port_by_id(updated_port['id'])
# assume IP change if not in cache
orig = orig or {'fixed_ips': []}
old_ips = {i['ip_address'] for i in orig['fixed_ips'] or []}
new_ips = {i['ip_address'] for i in updated_port['fixed_ips']}
old_subs = {i['subnet_id'] for i in orig['fixed_ips'] or []}
new_subs = {i['subnet_id'] for i in updated_port['fixed_ips']}
if new_subs != old_subs:
# subnets being serviced by port have changed, this could
# indicate a subnet_delete is in progress. schedule a
# resync rather than an immediate restart so we don't
# attempt to re-allocate IPs at the same time the server
# is deleting them.
self.schedule_resync("Agent port was modified",
updated_port.network_id)
return
elif old_ips != new_ips:
LOG.debug("Agent IPs on network %s changed from %s to %s",
network.id, old_ips, new_ips)
driver_action = 'restart'
self.cache.put_port(updated_port)
self.call_driver(driver_action, network)
self.dhcp_ready_ports.add(updated_port.id)
self.update_isolated_metadata_proxy(network)
self.reload_allocations(updated_port, network)
def reload_allocations(self, port, network):
LOG.info("Trigger reload_allocations for port %s", port)
driver_action = 'reload_allocations'
if self._is_port_on_this_agent(port):
orig = self.cache.get_port_by_id(port['id'])
# assume IP change if not in cache
orig = orig or {'fixed_ips': []}
old_ips = {i['ip_address'] for i in orig['fixed_ips'] or []}
new_ips = {i['ip_address'] for i in port['fixed_ips']}
old_subs = {i['subnet_id'] for i in orig['fixed_ips'] or []}
new_subs = {i['subnet_id'] for i in port['fixed_ips']}
if new_subs != old_subs:
# subnets being serviced by port have changed, this could
# indicate a subnet_delete is in progress. schedule a
# resync rather than an immediate restart so we don't
# attempt to re-allocate IPs at the same time the server
# is deleting them.
self.schedule_resync("Agent port was modified",
port.network_id)
return
elif old_ips != new_ips:
LOG.debug("Agent IPs on network %s changed from %s to %s",
network.id, old_ips, new_ips)
driver_action = 'restart'
self.cache.put_port(port)
self.call_driver(driver_action, network)
self.dhcp_ready_ports.add(port.id)
self.update_isolated_metadata_proxy(network)
def _is_port_on_this_agent(self, port):
thishost = utils.get_dhcp_agent_device_id(
port['network_id'], self.conf.host)
return port['device_id'] == thishost
# Use the update handler for the port create event.
port_create_end = port_update_end
@_wait_if_syncing
def port_create_end(self, context, payload):
"""Handle the port.create.end notification event."""
created_port = dhcp.DictModel(payload['port'])
with _net_lock(created_port.network_id):
network = self.cache.get_network_by_id(created_port.network_id)
if not network:
return
new_ips = {i['ip_address'] for i in created_port['fixed_ips']}
for port_cached in network.ports:
# if there are other ports cached with the same ip address in
# the same network this indicate that the cache is out of sync
cached_ips = {i['ip_address']
for i in port_cached['fixed_ips']}
if new_ips.intersection(cached_ips):
self.schedule_resync("Duplicate IP addresses found, "
"DHCP cache is out of sync",
created_port.network_id)
return
self.reload_allocations(created_port, network)
@_wait_if_syncing
def port_delete_end(self, context, payload):

35
neutron/tests/unit/agent/dhcp/test_agent.py
View File

@ -1072,19 +1072,35 @@ class TestDhcpAgentEventHandler(base.BaseTestCase):
fake_network)
def test_port_update_end(self):
payload = dict(port=fake_port2)
self.reload_allocations_p = mock.patch.object(self.dhcp,
'reload_allocations')
self.reload_allocations = self.reload_allocations_p.start()
payload = dict(port=copy.deepcopy(fake_port2))
self.cache.get_network_by_id.return_value = fake_network
self.dhcp.port_update_end(None, payload)
self.reload_allocations.assert_called_once_with(fake_port2,
fake_network)
def test_reload_allocations(self):
self.cache.get_port_by_id.return_value = fake_port2
with mock.patch.object(
self.dhcp, 'update_isolated_metadata_proxy') as ump:
self.dhcp.port_update_end(None, payload)
self.cache.assert_has_calls(
[mock.call.get_network_by_id(fake_port2.network_id),
mock.call.put_port(mock.ANY)])
self.dhcp.reload_allocations(fake_port2, fake_network)
self.cache.assert_has_calls([mock.call.put_port(mock.ANY)])
self.call_driver.assert_called_once_with('reload_allocations',
fake_network)
self.assertTrue(ump.called)
def test_port_create_end(self):
self.reload_allocations_p = mock.patch.object(self.dhcp,
'reload_allocations')
self.reload_allocations = self.reload_allocations_p.start()
payload = dict(port=copy.deepcopy(fake_port2))
self.cache.get_network_by_id.return_value = fake_network
self.dhcp.port_create_end(None, payload)
self.reload_allocations.assert_called_once_with(fake_port2,
fake_network)
def test_port_update_end_grabs_lock(self):
payload = dict(port=fake_port2)
self.cache.get_network_by_id.return_value = None
@ -1144,6 +1160,15 @@ class TestDhcpAgentEventHandler(base.BaseTestCase):
self.schedule_resync.assert_called_once_with(mock.ANY,
fake_port1.network_id)
def test_port_create_duplicate_ip_on_dhcp_agents_same_network(self):
self.cache.get_network_by_id.return_value = fake_network
payload = dict(port=copy.deepcopy(fake_port2))
duplicate_ip = fake_port1['fixed_ips'][0]['ip_address']
payload['port']['fixed_ips'][0]['ip_address'] = duplicate_ip
self.dhcp.port_create_end(None, payload)
self.schedule_resync.assert_called_once_with(mock.ANY,
fake_port2.network_id)
def test_port_update_on_dhcp_agents_port_no_ip_change(self):
self.cache.get_network_by_id.return_value = fake_network
self.cache.get_port_by_id.return_value = fake_port1