Fixed missing attribute in the data model

Querying compute.node.* with Ceilometer requires some additional
information in the cluster data model in order to build the
resource_id. This patchset add the attribute hostname and change
the query.

Change-Id: Ifcefcd70a6d0f5967ab4f638ce077e38ef214f64
Closes-Bug: #1521559

watcher/decision_engine/model/compute_resource.py

@@ -15,11 +15,12 @@
 # limitations under the License.
 
 
-class NamedElement(object):
+class ComputeResource(object):
 
     def __init__(self):
         self._uuid = ""
         self._human_id = ""
+        self._hostname = ""
 
     @property
     def uuid(self):
@@ -29,6 +30,14 @@ class NamedElement(object):
     def uuid(self, u):
         self._uuid = u
 
+    @property
+    def hostname(self):
+        return self._hostname
+
+    @hostname.setter
+    def hostname(self, h):
+        self._hostname = h
+
     @property
     def human_id(self):
         return self._human_id

watcher/decision_engine/model/hypervisor.py

@@ -13,13 +13,15 @@
 # implied.
 # See the License for the specific language governing permissions and
 # limitations under the License.
+
+from watcher.decision_engine.model.compute_resource import ComputeResource
 from watcher.decision_engine.model.hypervisor_state import HypervisorState
-from watcher.decision_engine.model.named_element import NamedElement
 from watcher.decision_engine.model.power_state import PowerState
 
 
-class Hypervisor(NamedElement):
+class Hypervisor(ComputeResource):
     def __init__(self):
+        super(Hypervisor, self).__init__()
         self._state = HypervisorState.ONLINE
         self._status = HypervisorState.ENABLED
         self._power_state = PowerState.g0

watcher/decision_engine/model/vm.py

@@ -13,12 +13,13 @@
 # implied.
 # See the License for the specific language governing permissions and
 # limitations under the License.
-from watcher.decision_engine.model.named_element import NamedElement
+from watcher.decision_engine.model.compute_resource import ComputeResource
 from watcher.decision_engine.model.vm_state import VMState
 
 
-class VM(NamedElement):
+class VM(ComputeResource):
     def __init__(self):
+        super(VM, self).__init__()
         self._state = VMState.ACTIVE.value
 
     @property

watcher/decision_engine/strategy/basic_consolidation.py

@@ -257,8 +257,10 @@ class BasicConsolidation(BaseStrategy):
             :param model:
             :return:
             """
+        resource_id = "{0}_{1}".format(hypervisor.uuid,
+                                       hypervisor.hostname)
         cpu_avg_vm = self.ceilometer. \
-            statistic_aggregation(resource_id=hypervisor.uuid,
+            statistic_aggregation(resource_id=resource_id,
                                   meter_name='compute.node.cpu.percent',
                                   period="7200",
                                   aggregate='avg'
@@ -266,7 +268,7 @@ class BasicConsolidation(BaseStrategy):
         if cpu_avg_vm is None:
             LOG.error(
                 "No values returned for {0} compute.node.cpu.percent".format(
-                    hypervisor.uuid))
+                    resource_id))
             cpu_avg_vm = 100
 
         cpu_capacity = model.get_resource_from_id(