openstack
/
neutron
Code Issues Proposed changes

Remove RPC to plugin when dhcp sets default route 

_set_default_route() was using an RPC to the plugin to get the DHCP
port for the network on the current host, and then used it to form
the tap device name. This happened on every allocation reload too.
This fix removes the RPC and gets the tap device name using local
methods instead. It also removes an unnecessary call to set the
default route in the restart method.

Closes-Bug: 1290068
Related-Bug: 1294254
Change-Id: I639bcf93725c4969d1011d2d20491d461ccfdbed
This commit is contained in:
Darragh O'Reilly 2014-03-09 15:14:03 +00:00
parent 0eb3a105d6
commit 9dbd1e5e5a
4 changed files with 97 additions and 124 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
neutron/agent/dhcp_agent.py
View File

@ -114,6 +114,8 @@ class DhcpAgent(manager.Manager):
def call_driver(self, action, network, **action_kwargs):
"""Invoke an action on a DHCP driver instance."""
LOG.debug(_('Calling driver for network: %(net)s action: %(action)s'),
{'net': network.id, 'action': action})
try:
# the Driver expects something that is duck typed similar to
# the base models.

26
neutron/agent/linux/dhcp.py
View File

@ -127,7 +127,6 @@ class DhcpBase(object):
"""Restart the dhcp service for the network."""
self.disable(retain_port=True)
self.enable()
self.device_manager.update(self.network)
@abc.abstractproperty
def active(self):
@ -399,7 +398,7 @@ class Dnsmasq(DhcpLocalProcess):
else:
LOG.debug(_('Pid %d is stale, relaunching dnsmasq'), self.pid)
LOG.debug(_('Reloading allocations for network: %s'), self.network.id)
self.device_manager.update(self.network)
self.device_manager.update(self.network, self.interface_name)
def _iter_hosts(self):
"""Iterate over hosts.
@ -702,21 +701,16 @@ class DeviceManager(object):
host_uuid = uuid.uuid5(uuid.NAMESPACE_DNS, socket.gethostname())
return 'dhcp%s-%s' % (host_uuid, network.id)
def _get_device(self, network, port):
"""Return DHCP ip_lib device for this host on the network."""
interface_name = self.get_interface_name(network, port)
return ip_lib.IPDevice(interface_name,
self.root_helper,
network.namespace)
def _set_default_route(self, network, port):
def _set_default_route(self, network, device_name):
"""Sets the default gateway for this dhcp namespace.
This method is idempotent and will only adjust the route if adjusting
it would change it from what it already is. This makes it safe to call
and avoids unnecessary perturbation of the system.
"""
device = self._get_device(network, port)
device = ip_lib.IPDevice(device_name,
self.root_helper,
network.namespace)
gateway = device.route.get_gateway()
if gateway:
gateway = gateway['gateway']
@ -851,18 +845,14 @@ class DeviceManager(object):
device.route.pullup_route(interface_name)
if self.conf.use_namespaces:
self._set_default_route(network, port)
self._set_default_route(network, interface_name)
return interface_name
def update(self, network):
def update(self, network, device_name):
"""Update device settings for the network's DHCP on this host."""
if self.conf.use_namespaces:
device_id = self.get_device_id(network)
port = self.plugin.get_dhcp_port(network.id, device_id)
if not port:
raise exceptions.NetworkNotFound(net_id=network.id)
self._set_default_route(network, port)
self._set_default_route(network, device_name)
def destroy(self, network, device_name):
"""Destroy the device used for the network's DHCP on this host."""

156
neutron/tests/unit/test_dhcp_agent.py
View File

@ -1075,6 +1075,7 @@ class FakeV4Network:
id = 'aaaaaaaa-aaaa-aaaa-aaaa-aaaaaaaaaaaa'
subnets = [FakeV4Subnet()]
ports = [FakePort1()]
namespace = 'qdhcp-aaaaaaaa-aaaa-aaaa-aaaa-aaaaaaaaaaaa'
class FakeV4NetworkNoSubnet:
@ -1165,7 +1166,7 @@ class TestDeviceManager(base.BaseTestCase):
namespace=net.namespace))
self.mock_driver.assert_has_calls(expected)
dh._set_default_route.assert_called_once_with(net, port)
dh._set_default_route.assert_called_once_with(net, 'tap12345678-12')
def test_setup(self):
cfg.CONF.set_override('enable_metadata_network', False)
@ -1308,35 +1309,26 @@ class TestDeviceManager(base.BaseTestCase):
self.assertEqual(dh.get_device_id(fake_net), expected)
uuid5.assert_called_once_with(uuid.NAMESPACE_DNS, 'localhost')
def _get_device_manager_with_mock_device(self, conf, device):
dh = dhcp.DeviceManager(conf, cfg.CONF.root_helper, None)
dh._get_device = mock.Mock(return_value=device)
return dh
def test_update(self):
# Try with namespaces and no metadata network
cfg.CONF.set_override('use_namespaces', True)
cfg.CONF.set_override('enable_metadata_network', False)
dh = dhcp.DeviceManager(cfg.CONF, cfg.CONF.root_helper, None)
dh._set_default_route = mock.Mock()
network = mock.Mock()
port = mock.Mock()
dh.plugin = mock.Mock()
dh.plugin.get_dhcp_port.return_value = port
dh.update(network)
dh._set_default_route.assert_called_once_with(network, port)
dh.update(network, 'ns-12345678-12')
dh._set_default_route.assert_called_once_with(network,
'ns-12345678-12')
# No namespaces, shouldn't set default route.
cfg.CONF.set_override('use_namespaces', False)
cfg.CONF.set_override('enable_metadata_network', False)
dh = dhcp.DeviceManager(cfg.CONF, cfg.CONF.root_helper, None)
dh._set_default_route = mock.Mock()
dh.plugin = mock.Mock()
dh.plugin.get_dhcp_port.return_value = port
dh.update(FakeV4Network())
dh.update(FakeV4Network(), 'tap12345678-12')
self.assertFalse(dh._set_default_route.called)
@ -1345,10 +1337,8 @@ class TestDeviceManager(base.BaseTestCase):
cfg.CONF.set_override('enable_metadata_network', True)
dh = dhcp.DeviceManager(cfg.CONF, cfg.CONF.root_helper, None)
dh._set_default_route = mock.Mock()
dh.plugin = mock.Mock()
dh.plugin.get_dhcp_port.return_value = port
dh.update(FakeV4Network())
dh.update(FakeV4Network(), 'ns-12345678-12')
self.assertTrue(dh._set_default_route.called)
@ -1358,123 +1348,109 @@ class TestDeviceManager(base.BaseTestCase):
dh = dhcp.DeviceManager(cfg.CONF, cfg.CONF.root_helper, None)
dh._set_default_route = mock.Mock()
dh.update(FakeV4Network())
dh.update(FakeV4Network(), 'ns-12345678-12')
self.assertFalse(dh._set_default_route.called)
def test_set_default_route(self):
device = mock.Mock()
device.route.get_gateway.return_value = None
# Basic one subnet with gateway.
dh = self._get_device_manager_with_mock_device(cfg.CONF, device)
network = FakeV4Network()
dh._set_default_route(network, mock.Mock())
dh = dhcp.DeviceManager(cfg.CONF, cfg.CONF.root_helper, None)
with mock.patch.object(dhcp.ip_lib, 'IPDevice') as mock_IPDevice:
device = mock.Mock()
mock_IPDevice.return_value = device
device.route.get_gateway.return_value = None
# Basic one subnet with gateway.
network = FakeV4Network()
dh._set_default_route(network, 'tap-name')
device.route.get_gateway.assert_called_once()
self.assertFalse(device.route.delete_gateway.called)
device.route.add_gateway.assert_called_once_with('192.168.0.1')
def test_set_default_route_no_subnet(self):
device = mock.Mock()
device.route.get_gateway.return_value = None
# Try a namespace but no subnet.
dh = self._get_device_manager_with_mock_device(cfg.CONF, device)
network = FakeV4NetworkNoSubnet()
dh._set_default_route(network, mock.Mock())
dh = dhcp.DeviceManager(cfg.CONF, cfg.CONF.root_helper, None)
with mock.patch.object(dhcp.ip_lib, 'IPDevice') as mock_IPDevice:
device = mock.Mock()
mock_IPDevice.return_value = device
device.route.get_gateway.return_value = None
network = FakeV4NetworkNoSubnet()
network.namespace = 'qdhcp-1234'
dh._set_default_route(network, 'tap-name')
device.route.get_gateway.assert_called_once()
self.assertFalse(device.route.delete_gateway.called)
self.assertFalse(device.route.add_gateway.called)
def test_set_default_route_no_subnet_delete_gateway(self):
device = mock.Mock()
device.route.get_gateway.return_value = dict(gateway='192.168.0.1')
# Try a namespace but no subnet where a gateway needs to be deleted.
dh = self._get_device_manager_with_mock_device(cfg.CONF, device)
network = FakeV4NetworkNoSubnet()
dh._set_default_route(network, mock.Mock())
dh = dhcp.DeviceManager(cfg.CONF, cfg.CONF.root_helper, None)
with mock.patch.object(dhcp.ip_lib, 'IPDevice') as mock_IPDevice:
device = mock.Mock()
mock_IPDevice.return_value = device
device.route.get_gateway.return_value = dict(gateway='192.168.0.1')
network = FakeV4NetworkNoSubnet()
network.namespace = 'qdhcp-1234'
dh._set_default_route(network, 'tap-name')
device.route.get_gateway.assert_called_once()
device.route.delete_gateway.assert_called_once_with('192.168.0.1')
self.assertFalse(device.route.add_gateway.called)
def test_set_default_route_no_gateway(self):
device = mock.Mock()
device.route.get_gateway.return_value = dict(gateway='192.168.0.1')
# Try a subnet with no gateway
dh = self._get_device_manager_with_mock_device(cfg.CONF, device)
network = FakeV4NetworkNoGateway()
dh._set_default_route(network, mock.Mock())
dh = dhcp.DeviceManager(cfg.CONF, cfg.CONF.root_helper, None)
with mock.patch.object(dhcp.ip_lib, 'IPDevice') as mock_IPDevice:
device = mock.Mock()
mock_IPDevice.return_value = device
device.route.get_gateway.return_value = dict(gateway='192.168.0.1')
network = FakeV4NetworkNoGateway()
network.namespace = 'qdhcp-1234'
dh._set_default_route(network, 'tap-name')
device.route.get_gateway.assert_called_once()
device.route.delete_gateway.assert_called_once_with('192.168.0.1')
self.assertFalse(device.route.add_gateway.called)
def test_set_default_route_do_nothing(self):
device = mock.Mock()
device.route.get_gateway.return_value = dict(gateway='192.168.0.1')
# Try a subnet where the gateway doesn't change. Should do nothing.
dh = self._get_device_manager_with_mock_device(cfg.CONF, device)
network = FakeV4Network()
dh._set_default_route(network, mock.Mock())
dh = dhcp.DeviceManager(cfg.CONF, cfg.CONF.root_helper, None)
with mock.patch.object(dhcp.ip_lib, 'IPDevice') as mock_IPDevice:
device = mock.Mock()
mock_IPDevice.return_value = device
device.route.get_gateway.return_value = dict(gateway='192.168.0.1')
network = FakeV4Network()
dh._set_default_route(network, 'tap-name')
device.route.get_gateway.assert_called_once()
self.assertFalse(device.route.delete_gateway.called)
self.assertFalse(device.route.add_gateway.called)
def test_set_default_route_change_gateway(self):
device = mock.Mock()
device.route.get_gateway.return_value = dict(gateway='192.168.0.2')
# Try a subnet with a gateway this is different than the current.
dh = self._get_device_manager_with_mock_device(cfg.CONF, device)
network = FakeV4Network()
dh._set_default_route(network, mock.Mock())
dh = dhcp.DeviceManager(cfg.CONF, cfg.CONF.root_helper, None)
with mock.patch.object(dhcp.ip_lib, 'IPDevice') as mock_IPDevice:
device = mock.Mock()
mock_IPDevice.return_value = device
device.route.get_gateway.return_value = dict(gateway='192.168.0.2')
network = FakeV4Network()
dh._set_default_route(network, 'tap-name')
device.route.get_gateway.assert_called_once()
self.assertFalse(device.route.delete_gateway.called)
device.route.add_gateway.assert_called_once_with('192.168.0.1')
def test_set_default_route_two_subnets(self):
device = mock.Mock()
device.route.get_gateway.return_value = None
# Try two subnets. Should set gateway from the first.
dh = self._get_device_manager_with_mock_device(cfg.CONF, device)
network = FakeV4Network()
subnet2 = FakeV4Subnet()
subnet2.gateway_ip = '192.168.1.1'
network.subnets = [subnet2, FakeV4Subnet()]
dh._set_default_route(network, mock.Mock())
# Try two subnets. Should set gateway from the first.
dh = dhcp.DeviceManager(cfg.CONF, cfg.CONF.root_helper, None)
with mock.patch.object(dhcp.ip_lib, 'IPDevice') as mock_IPDevice:
device = mock.Mock()
mock_IPDevice.return_value = device
device.route.get_gateway.return_value = None
network = FakeV4Network()
subnet2 = FakeV4Subnet()
subnet2.gateway_ip = '192.168.1.1'
network.subnets = [subnet2, FakeV4Subnet()]
dh._set_default_route(network, 'tap-name')
device.route.get_gateway.assert_called_once()
self.assertFalse(device.route.delete_gateway.called)
device.route.add_gateway.assert_called_once_with('192.168.1.1')
def test_get_device_dont_call_get_dhcp_port(self):
dh = dhcp.DeviceManager(cfg.CONF, cfg.CONF.root_helper, None)
dh.get_interface_name = mock.Mock()
dh.plugin = mock.Mock()
network = mock.Mock()
port = mock.Mock()
dh._get_device(network, port)
self.assertFalse(dh.plugin.get_dhcp_port.called)
dh.get_interface_name.assert_called_once_with(network, port)
class TestDictModel(base.BaseTestCase):
def test_basic_dict(self):

37
neutron/tests/unit/test_linux_dhcp.py
View File

@ -15,6 +15,7 @@
# License for the specific language governing permissions and limitations
# under the License.
import contextlib
import os
import mock
@ -1016,26 +1017,29 @@ tag:tag1,249,%s,%s""".lstrip() % (fake_v6,
exp_args = ['kill', '-HUP', 5]
with mock.patch('os.path.isdir') as isdir:
isdir.return_value = True
with mock.patch.object(dhcp.Dnsmasq, 'active') as active:
active.__get__ = mock.Mock(return_value=True)
with mock.patch.object(dhcp.Dnsmasq, 'pid') as pid:
pid.__get__ = mock.Mock(return_value=5)
dm = dhcp.Dnsmasq(self.conf, FakeDualNetwork(),
version=float(2.59))
fake_net = FakeDualNetwork()
dm = dhcp.Dnsmasq(self.conf, fake_net, version=float(2.59))
method_name = '_make_subnet_interface_ip_map'
with mock.patch.object(dhcp.Dnsmasq,
method_name) as ip_map:
ip_map.return_value = {}
dm.reload_allocations()
self.assertTrue(ip_map.called)
with contextlib.nested(
mock.patch('os.path.isdir', return_value=True),
mock.patch.object(dhcp.Dnsmasq, 'active'),
mock.patch.object(dhcp.Dnsmasq, 'pid'),
mock.patch.object(dhcp.Dnsmasq, 'interface_name'),
mock.patch.object(dhcp.Dnsmasq, '_make_subnet_interface_ip_map'),
mock.patch.object(dm, 'device_manager')
) as (isdir, active, pid, interface_name, ip_map, device_manager):
active.__get__ = mock.Mock(return_value=True)
pid.__get__ = mock.Mock(return_value=5)
interface_name.__get__ = mock.Mock(return_value='tap12345678-12')
ip_map.return_value = {}
dm.reload_allocations()
self.assertTrue(ip_map.called)
self.safe.assert_has_calls([mock.call(exp_host_name, exp_host_data),
mock.call(exp_addn_name, exp_addn_data),
mock.call(exp_opt_name, exp_opt_data)])
self.execute.assert_called_once_with(exp_args, 'sudo')
device_manager.update.assert_called_with(fake_net, 'tap12345678-12')
def test_reload_allocations_stale_pid(self):
(exp_host_name, exp_host_data,
@ -1057,8 +1061,9 @@ tag:tag1,249,%s,%s""".lstrip() % (fake_v6,
method_name = '_make_subnet_interface_ip_map'
with mock.patch.object(dhcp.Dnsmasq, method_name) as ipmap:
ipmap.return_value = {}
dm.reload_allocations()
self.assertTrue(ipmap.called)
with mock.patch.object(dhcp.Dnsmasq, 'interface_name'):
dm.reload_allocations()
self.assertTrue(ipmap.called)
self.safe.assert_has_calls([
mock.call(exp_host_name, exp_host_data),