77b7fae41e
In this changeset, I implemented the notification handling (Rx only) system for consuming incoming notifications, more especially the Nova ones. The notifications handlers also contain the logic which incrementally updates the Compute model. Change-Id: Ia036a5a2be6caa64b7f180de38821b57c624300c Partially-implements: blueprint cluster-model-objects-wrapper
114 lines
4.0 KiB
Python
114 lines
4.0 KiB
Python
# -*- encoding: utf-8 -*-
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# Copyright (c) 2015 b<>com
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#
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# Authors: Jean-Emile DARTOIS <jean-emile.dartois@b-com.com>
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#
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# Licensed under the Apache License, Version 2.0 (the "License");
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# you may not use this file except in compliance with the License.
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# You may obtain a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or
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# implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.
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from oslo_log import log
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from watcher.common import nova_helper
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from watcher.decision_engine.model.collector import base
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from watcher.decision_engine.model import element
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from watcher.decision_engine.model import model_root
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from watcher.decision_engine.model.notification import nova
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LOG = log.getLogger(__name__)
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class NovaClusterDataModelCollector(base.BaseClusterDataModelCollector):
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"""nova
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*Description*
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This Nova cluster data model collector creates an in-memory representation
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of the resources exposed by the compute service.
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*Spec URL*
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<None>
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"""
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def __init__(self, config, osc=None):
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super(NovaClusterDataModelCollector, self).__init__(config, osc)
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self.wrapper = nova_helper.NovaHelper(osc=self.osc)
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@property
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def notification_endpoints(self):
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"""Associated notification endpoints
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:return: Associated notification endpoints
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:rtype: List of :py:class:`~.EventsNotificationEndpoint` instances
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"""
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return [
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nova.ServiceUpdated(self),
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nova.InstanceCreated(self),
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nova.InstanceUpdated(self),
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nova.InstanceDeletedEnd(self),
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nova.LegacyInstanceCreatedEnd(self),
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nova.LegacyInstanceUpdated(self),
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nova.LegacyInstanceDeletedEnd(self),
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nova.LegacyLiveMigratedEnd(self),
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]
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def execute(self):
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"""Build the compute cluster data model"""
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LOG.debug("Building latest Nova cluster data model")
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model = model_root.ModelRoot()
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mem = element.Resource(element.ResourceType.memory)
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num_cores = element.Resource(element.ResourceType.cpu_cores)
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disk = element.Resource(element.ResourceType.disk)
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disk_capacity = element.Resource(element.ResourceType.disk_capacity)
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model.create_resource(mem)
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model.create_resource(num_cores)
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model.create_resource(disk)
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model.create_resource(disk_capacity)
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flavor_cache = {}
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nodes = self.wrapper.get_compute_node_list()
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for n in nodes:
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service = self.wrapper.nova.services.find(id=n.service['id'])
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# create node in cluster_model_collector
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node = element.ComputeNode()
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node.uuid = service.host
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node.hostname = n.hypervisor_hostname
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# set capacity
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mem.set_capacity(node, n.memory_mb)
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disk.set_capacity(node, n.free_disk_gb)
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disk_capacity.set_capacity(node, n.local_gb)
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num_cores.set_capacity(node, n.vcpus)
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node.state = n.state
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node.status = n.status
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model.add_node(node)
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instances = self.wrapper.get_instances_by_node(str(service.host))
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for v in instances:
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# create VM in cluster_model_collector
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instance = element.Instance()
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instance.uuid = v.id
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# nova/nova/compute/instance_states.py
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instance.state = getattr(v, 'OS-EXT-STS:vm_state')
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# set capacity
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self.wrapper.get_flavor_instance(v, flavor_cache)
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mem.set_capacity(instance, v.flavor['ram'])
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disk.set_capacity(instance, v.flavor['disk'])
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num_cores.set_capacity(instance, v.flavor['vcpus'])
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model.map_instance(instance, node)
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return model
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