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
112 lines
3.4 KiB
Python
112 lines
3.4 KiB
Python
# -*- encoding: utf-8 -*-
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# Copyright (c) 2015 b<>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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import threading
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from oslo_log import log
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from watcher._i18n import _LW
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LOG = log.getLogger(__name__)
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class Mapping(object):
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def __init__(self, model):
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self.model = model
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self.compute_node_mapping = {}
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self.instance_mapping = {}
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self.lock = threading.Lock()
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def map(self, node, instance):
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"""Select the node where the instance is launched
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:param node: the node
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:param instance: the virtual machine or instance
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"""
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try:
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self.lock.acquire()
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# init first
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if node.uuid not in self.compute_node_mapping.keys():
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self.compute_node_mapping[node.uuid] = set()
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# map node => instances
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self.compute_node_mapping[node.uuid].add(instance.uuid)
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# map instance => node
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self.instance_mapping[instance.uuid] = node.uuid
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finally:
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self.lock.release()
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def unmap(self, node, instance):
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"""Remove the instance from the node
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:param node: the node
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:param instance: the virtual machine or instance
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"""
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self.unmap_from_id(node.uuid, instance.uuid)
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def unmap_from_id(self, node_uuid, instance_uuid):
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"""Remove the instance (by id) from the node (by id)
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:rtype : object
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"""
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try:
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self.lock.acquire()
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if str(node_uuid) in self.compute_node_mapping:
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self.compute_node_mapping[str(node_uuid)].remove(
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str(instance_uuid))
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# remove instance
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self.instance_mapping.pop(instance_uuid)
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else:
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LOG.warning(
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_LW("Trying to delete the instance %(instance)s but it "
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"was not found on node %(node)s") %
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{'instance': instance_uuid, 'node': node_uuid})
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finally:
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self.lock.release()
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def get_mapping(self):
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return self.compute_node_mapping
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def get_node_from_instance(self, instance):
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return self.get_node_from_instance_id(instance.uuid)
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def get_node_from_instance_id(self, instance_uuid):
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"""Getting host information from the guest instance
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:param instance: the uuid of the instance
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:return: node
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"""
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return self.model.get_node_from_id(
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self.instance_mapping[str(instance_uuid)])
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def get_node_instances(self, node):
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"""Get the list of instances running on the node
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:param node:
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:return:
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"""
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return self.get_node_instances_from_id(node.uuid)
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def get_node_instances_from_id(self, node_uuid):
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if str(node_uuid) in self.compute_node_mapping.keys():
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return self.compute_node_mapping[str(node_uuid)]
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else:
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# empty
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return set()
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