Create DHCP agent tap device from port ID

Fixes bug 1022806

Change-Id: If29ffdc35d02f8e18789173f250c1eab28a258fc

quantum/agent/dhcp_agent.py

@@ -206,8 +206,10 @@ class DeviceManager(object):
             LOG.error(_('You must specify an interface driver'))
         self.driver = importutils.import_object(conf.interface_driver, conf)
 
-    def get_interface_name(self, network):
+    def get_interface_name(self, network, port=None):
-        return ('tap' + network.id)[:self.driver.DEV_NAME_LEN]
+        if not port:
+            port = self._get_or_create_port(network)
+        return ('tap' + port.id)[:self.driver.DEV_NAME_LEN]
 
     def get_device_id(self, network):
         # There could be more than one dhcp server per network, so create
@@ -217,8 +219,8 @@ class DeviceManager(object):
         return 'dhcp%s-%s' % (host_uuid, network.id)
 
     def setup(self, network, reuse_existing=False):
-        interface_name = self.get_interface_name(network)
         port = self._get_or_create_port(network)
+        interface_name = self.get_interface_name(network, port)
 
         if ip_lib.device_exists(interface_name):
             if not reuse_existing:

quantum/agent/linux/interface.py

@@ -139,10 +139,6 @@ class BridgeInterfaceDriver(LinuxInterfaceDriver):
 
     def plug(self, network_id, port_id, device_name, mac_address):
         """Plugin the interface."""
-        bridge = self.get_bridge(network_id)
-
-        self.check_bridge_exists(bridge)
-
         if not ip_lib.device_exists(device_name):
             device = ip_lib.IPDevice(device_name, self.conf.root_helper)
             try:

quantum/tests/unit/test_dhcp_agent.py

@@ -233,7 +233,7 @@ class TestDeviceManager(unittest.TestCase):
                                  tenant_id='aaaaaaaa-aaaa-aaaa-aaaaaaaaaaaa',
                                  subnets=fake_subnets)
 
-        fake_port = FakeModel('12345678-aaaa-aaaa-1234567890ab',
+        fake_port = FakeModel('12345678-1234-aaaa-1234567890ab',
                               mac_address='aa:bb:cc:dd:ee:ff')
 
         port_dict = dict(mac_address='aa:bb:cc:dd:ee:ff', allocations=[], id=1)
@@ -270,7 +270,7 @@ class TestDeviceManager(unittest.TestCase):
 
         self.mock_driver.assert_has_calls([
             mock.call.plug('12345678-1234-5678-1234567890ab',
-                           '12345678-aaaa-aaaa-1234567890ab',
+                           '12345678-1234-aaaa-1234567890ab',
                            'tap12345678-12',
                            'aa:bb:cc:dd:ee:ff'),
             mock.call.init_l3(mock.ANY, 'tap12345678-12')]
@@ -284,13 +284,43 @@ class TestDeviceManager(unittest.TestCase):
                                  tenant_id='aaaaaaaa-aaaa-aaaa-aaaaaaaaaaaa',
                                  subnets=fake_subnets)
 
+        fake_port = FakeModel('12345678-1234-aaaa-1234567890ab',
+                              mac_address='aa:bb:cc:dd:ee:ff')
+
+        port_dict = dict(mac_address='aa:bb:cc:dd:ee:ff', allocations=[], id=1)
+
+        self.client_inst.create_port.return_value = dict(port=port_dict)
+        self.device_exists.return_value = False
+
+        # fake the db
+        filter_by_result = mock.Mock()
+        filter_by_result.one = mock.Mock(return_value=fake_port)
+
+        self.filter_called = False
+
+        def get_filter_results(*args, **kwargs):
+            if self.filter_called:
+                return filter_by_result
+            else:
+                self.filter_called = True
+                raise sqlsoup.SQLAlchemyError()
+
+            return filter_results.pop(0)
+
+        mock_db = mock.Mock()
+        mock_db.ports = mock.Mock(name='ports2')
+        mock_db.ports.filter_by = mock.Mock(
+            name='filter_by',
+            side_effect=get_filter_results)
+
         with mock.patch('quantum.agent.linux.interface.NullDriver') as dvr_cls:
             mock_driver = mock.MagicMock()
             mock_driver.DEV_NAME_LEN = (
                 interface.LinuxInterfaceDriver.DEV_NAME_LEN)
+            mock_driver.port = fake_port
             dvr_cls.return_value = mock_driver
 
-            dh = dhcp_agent.DeviceManager(self.conf, None)
+            dh = dhcp_agent.DeviceManager(self.conf, mock_db)
             dh.destroy(fake_network)
 
             dvr_cls.assert_called_once_with(self.conf)