VMware: spawn refactor - phase 1 - execute_create_vm

Moves the inner function "execute_create_vm" from the spawn method
to vm_util. Additionally, return the vm_ref after VM creation so
an extra call to retrieve the vm_ref does not need to take place
after the fact.

partial blueprint vmware-spawn-refactor
Co-authored-by: Tracy Jones <tjones@vmware.com>

Change-Id: I67c3c8c14b6c01b160611cc001d51f1da29ffb24

nova/tests/virt/vmwareapi/test_vm_util.py

@@ -17,6 +17,7 @@
 import collections
 import re
 
+import contextlib
 import mock
 
 from nova import exception
@@ -39,6 +40,9 @@ class fake_session(object):
         self.ind = (self.ind + 1) % len(self.ret)
         return self.ret[self.ind - 1]
 
+    def _wait_for_task(self):
+        pass
+
     def _get_vim(self):
         fake_vim = fake.DataObject()
         client = fake.DataObject()
@@ -632,6 +636,48 @@ class VMwareVMUtilTestCase(test.NoDBTestCase):
         result = re.sub(r'\s+', '', repr(result))
         self.assertEqual(expected, result)
 
+    def test_create_vm(self):
+
+        method_list = ['CreateVM_Task', 'get_dynamic_property']
+
+        def fake_call_method(module, method, *args, **kwargs):
+            expected_method = method_list.pop(0)
+            self.assertEqual(expected_method, method)
+            if (expected_method == 'CreateVM_Task'):
+                return 'fake_create_vm_task'
+            elif (expected_method == 'get_dynamic_property'):
+                task_info = mock.Mock(state="success", result="fake_vm_ref")
+                return task_info
+            else:
+                self.fail('Should not get here....')
+
+        def fake_wait_for_task(self, *args):
+            task_info = mock.Mock(state="success", result="fake_vm_ref")
+            return task_info
+
+        session = fake_session()
+        fake_instance = mock.MagicMock()
+        fake_call_mock = mock.Mock(side_effect=fake_call_method)
+        fake_wait_mock = mock.Mock(side_effect=fake_wait_for_task)
+        with contextlib.nested(
+                mock.patch.object(session, '_wait_for_task',
+                                  fake_wait_mock),
+                mock.patch.object(session, '_call_method',
+                                  fake_call_mock)
+        ) as (wait_for_task, call_method):
+            vm_ref = vm_util.create_vm(
+                session,
+                fake_instance,
+                'fake_vm_folder',
+                'fake_config_spec',
+                'fake_res_pool_ref')
+            self.assertEqual('fake_vm_ref', vm_ref)
+
+            call_method.assert_called_once_with(mock.ANY, 'CreateVM_Task',
+                'fake_vm_folder', config='fake_config_spec',
+                pool='fake_res_pool_ref')
+            wait_for_task.assert_called_once_with('fake_create_vm_task')
+
     def test_convert_vif_model(self):
         expected = "VirtualE1000"
         result = vm_util._convert_vif_model(network_model.VIF_MODEL_E1000)

nova/virt/vmwareapi/fake.py

@@ -1098,7 +1098,7 @@ class FakeVim(object):
         _create_object("VirtualMachine", virtual_machine)
         res_pool = _get_object(pool)
         res_pool.vm.ManagedObjectReference.append(virtual_machine.obj)
-        task_mdo = create_task(method, "success")
+        task_mdo = create_task(method, "success", result=virtual_machine.obj)
         return task_mdo.obj
 
     def _reconfig_vm(self, method, *args, **kwargs):

nova/virt/vmwareapi/vm_util.py

@@ -1379,6 +1379,18 @@ def get_vmdk_adapter_type(adapter_type):
     return vmdk_adapter_type
 
 
+def create_vm(session, instance, vm_folder, config_spec, res_pool_ref):
+    """Create VM on ESX host."""
+    LOG.debug(_("Creating VM on the ESX host"), instance=instance)
+    vm_create_task = session._call_method(
+        session._get_vim(),
+        "CreateVM_Task", vm_folder,
+        config=config_spec, pool=res_pool_ref)
+    task_info = session._wait_for_task(vm_create_task)
+    LOG.debug(_("Created VM on the ESX host"), instance=instance)
+    return task_info.result
+
+
 def clone_vmref_for_instance(session, instance, vm_ref, host_ref, ds_ref,
                                 vmfolder_ref):
     """Clone VM and link the cloned VM to the instance.

nova/virt/vmwareapi/vmops.py

@@ -259,33 +259,14 @@ class VMwareVMOps(object):
         # for example when the spawn of a rescue instance takes place.
         if not instance_name:
             instance_name = instance['uuid']
-        # Get the create vm config spec
+
+        # Create the VM
         config_spec = vm_util.get_vm_create_spec(
                             client_factory, instance, instance_name,
                             data_store_name, vif_infos, os_type)
 
-        def _execute_create_vm():
-            """Create VM on ESX host."""
-            LOG.debug(_("Creating VM on the ESX host"), instance=instance)
-            # Create the VM on the ESX host
-            vm_create_task = self._session._call_method(
-                                    self._session._get_vim(),
-                                    "CreateVM_Task", dc_info.vmFolder,
-                                    config=config_spec, pool=res_pool_ref)
-            self._session._wait_for_task(vm_create_task)
-
-            LOG.debug(_("Created VM on the ESX host"), instance=instance)
-
-        _execute_create_vm()
-
-        # In the case of a rescue disk the instance_name is not the same as
-        # instance UUID. In this case the VM reference is accessed via the
-        # instance name.
-        if instance_name != instance['uuid']:
-            vm_ref = vm_util.get_vm_ref_from_name(self._session,
-                                                  instance_name)
-        else:
-            vm_ref = vm_util.get_vm_ref(self._session, instance)
+        vm_ref = vm_util.create_vm(self._session, instance, dc_info.vmFolder,
+                                   config_spec, res_pool_ref)
 
         # Set the machine.id parameter of the instance to inject
         # the NIC configuration inside the VM