Remove unneeded call to fetch network info on shutdown

There is no reason to fetch the network_info from the network api on shutdown
since we can just pull it out of the local cache. There are probably other
places where this call to the network api call can be removed but this patch
just handles the case for shutdown.

Note: the following test was removed 'test_terminate_no_fixed_ips' as
the call to the network api is no longer done so this test would be the
same as test_terminate_no_network.

Closes-bug: #1288392

Change-Id: Ifbf751739c215e566926719f481c03e2c064163a

nova/api/ec2/cloud.py

@@ -1388,7 +1388,7 @@ class CloudController(object):
     def _ec2_ids_to_instances(self, context, instance_id, objects=False):
         """Get all instances first, to prevent partial executions."""
         instances = []
-        extra = ['system_metadata', 'metadata']
+        extra = ['system_metadata', 'metadata', 'info_cache']
         for ec2_id in instance_id:
             validate_ec2_id(ec2_id)
             instance_uuid = ec2utils.ec2_inst_id_to_uuid(context, ec2_id)

nova/compute/manager.py

@@ -2131,12 +2131,7 @@ class ComputeManager(manager.Manager):
             self._notify_about_instance_usage(context, instance,
                                               "shutdown.start")
 
-        # get network info before tearing down
-        try:
-            network_info = self._get_instance_nw_info(context, instance)
-        except (exception.NetworkNotFound, exception.NoMoreFixedIps,
-                exception.InstanceInfoCacheNotFound):
-            network_info = network_model.NetworkInfo()
+        network_info = compute_utils.get_nw_info_for_instance(instance)
 
         # NOTE(vish) get bdms before destroying the instance
         vol_bdms = [bdm for bdm in bdms if bdm.is_volume]

nova/network/neutronv2/api.py

@@ -19,9 +19,9 @@ import time
 
 from neutronclient.common import exceptions as neutron_client_exc
 from oslo.config import cfg
-import six
 
 from nova.compute import flavors
+from nova.compute import utils as compute_utils
 from nova import conductor
 from nova import exception
 from nova.network import base_api
@@ -31,7 +31,6 @@ from nova.network.neutronv2 import constants
 from nova.network.security_group import openstack_driver
 from nova.openstack.common import excutils
 from nova.openstack.common.gettextutils import _
-from nova.openstack.common import jsonutils
 from nova.openstack.common import log as logging
 from nova.openstack.common import uuidutils
 
@@ -488,12 +487,7 @@ class API(base_api.NetworkAPI):
                        " networks as not none.")
             raise exception.NovaException(message=message)
 
-        # Unfortunately, this is sometimes in unicode and sometimes not
-        if isinstance(instance['info_cache']['network_info'], six.text_type):
-            ifaces = jsonutils.loads(instance['info_cache']['network_info'])
-        else:
-            ifaces = instance['info_cache']['network_info']
-
+        ifaces = compute_utils.get_nw_info_for_instance(instance)
         # This code path is only done when refreshing the network_cache
         if port_ids is None:
             port_ids = [iface['id'] for iface in ifaces]

nova/tests/compute/test_compute.py

@@ -1726,40 +1726,6 @@ class ComputeTestCase(BaseTestCase):
         instances = db.instance_get_all(self.context)
         LOG.info(_("Running instances: %s"), instances)
         self.assertEqual(len(instances), 1)
-
-        # Make it look like this is no instance
-        self.mox.StubOutWithMock(self.compute, '_get_instance_nw_info')
-        self.compute._get_instance_nw_info(
-                mox.IgnoreArg(),
-                mox.IgnoreArg()).AndRaise(
-                    exception.NetworkNotFound(network_id='fake')
-                )
-        self.mox.ReplayAll()
-
-        self.compute.terminate_instance(self.context,
-                self._objectify(instance), [], [])
-
-        instances = db.instance_get_all(self.context)
-        LOG.info(_("After terminating instances: %s"), instances)
-        self.assertEqual(len(instances), 0)
-
-    def test_terminate_no_fixed_ips(self):
-        # This is as reported in LP bug 1192893
-        instance = jsonutils.to_primitive(self._create_fake_instance())
-
-        self.compute.run_instance(self.context, instance, {}, {}, [], None,
-                None, True, None, False)
-
-        instances = db.instance_get_all(self.context)
-        LOG.info(_("Running instances: %s"), instances)
-        self.assertEqual(len(instances), 1)
-
-        self.mox.StubOutWithMock(self.compute, '_get_instance_nw_info')
-        self.compute._get_instance_nw_info(
-                mox.IgnoreArg(),
-                mox.IgnoreArg()).AndRaise(
-                    exception.NoMoreFixedIps()
-                )
         self.mox.ReplayAll()
 
         self.compute.terminate_instance(self.context,

nova/tests/compute/test_compute_utils.py

@@ -428,6 +428,7 @@ class UsageInfoTestCase(test.TestCase):
         inst['ami_launch_index'] = 0
         inst['root_gb'] = 0
         inst['ephemeral_gb'] = 0
+        inst['info_cache'] = {'network_info': '[]'}
         inst.update(params)
         return db.instance_create(self.context, inst)['id']
 
@@ -472,7 +473,7 @@ class UsageInfoTestCase(test.TestCase):
         # Ensure 'exists' notification generates appropriate usage data.
         instance_id = self._create_instance()
         instance = instance_obj.Instance.get_by_id(self.context, instance_id,
-                expected_attrs=['metadata', 'system_metadata'])
+                expected_attrs=['metadata', 'system_metadata', 'info_cache'])
         # Set some system metadata
         sys_metadata = {'image_md_key1': 'val1',
                         'image_md_key2': 'val2',