91 lines
2.7 KiB
Python
91 lines
2.7 KiB
Python
# (c) Copyright 2014,2015 Hewlett-Packard Development Company, L.P.
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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 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 abc
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import six
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@six.add_metaclass(abc.ABCMeta)
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class EvacuatorBaseDriver(object):
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"""
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Abstract class for all evacuation drivers should implement to have
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a unified interface
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"""
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def __init__(self, wait, retries, **kwargs):
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"""
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Initialize Evacuation driver with the config args
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:param wait: time in seconds that the evcauator should wait before
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retrying to disable the node
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:param retries: Number of times the evacuator will try to disable the
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compute node
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:param kwargs: Dict of arguments that any future driver may need to
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load it from the config file
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:return: None
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"""
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self.wait = wait
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self.retries = retries
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self.options = kwargs
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@abc.abstractmethod
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def disable_node(self, node):
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"""
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Disable the compute node from accepting any new VMs or requests
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:param node: dict contains node's hostname
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:return: True pr False
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"""
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pass
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@abc.abstractmethod
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def is_node_disabled(self, node):
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"""
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Check if node is already disabled or not
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:param node: dict contains node's hostname
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:return: True or False
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"""
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pass
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@abc.abstractmethod
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def evacuate_nodes(self, nodes):
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"""
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Will evacuate all running VMs on the required nodes
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:param nodes: list of nodes
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:return: list of nodes with updated status
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"""
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pass
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@abc.abstractmethod
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def get_node_instances(self, node):
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"""
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List instances on a compute host
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:param node: dict contains node's hostname
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:return: List contains running VMs on a given node
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"""
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pass
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def get_info(self):
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"""
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Get Driver Information
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:return: Dict contains driver information
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"""
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pass
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@abc.abstractmethod
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def get_node_status(self, node):
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"""
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Check the node status and report it
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:param node: dict contains node's hostname
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:return: dict with key 'status': 'True or False'
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"""
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pass
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