117 lines
4.1 KiB
Python
117 lines
4.1 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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from oslo_config import cfg
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from oslo_log import log
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from freezer_dr.evacuators.common.driver import EvacuatorBaseDriver
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from freezer_dr.common.utils import get_os_client
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import time
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CONF = cfg.CONF
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LOG = log.getLogger(__name__)
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class StandardEvacuator(EvacuatorBaseDriver):
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def __init__(self, nodes, evacuator_conf, fencer):
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super(StandardEvacuator, self).__init__(nodes, evacuator_conf, fencer)
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# initialize the OS client!
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self.client = get_os_client()
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self.wait = evacuator_conf.get('wait')
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self.retires = evacuator_conf.get('retries', 1)
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if self.retires <= 0:
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self.retires = 1
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def _disable_node(self, node):
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if not self.is_node_disabled(node):
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return self.disable_node(node)
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else:
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True
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def evacuate(self, enable_fencing=True):
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# try to disable node
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# @todo needs more error handling like if the status didn't update or
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# we are unable to disable the node ???
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failed_nodes = [] # maintain nodes that are going to fail at any state
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succeeded_nodes = []
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for node in self.nodes:
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status = False
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for i in range(0, self.retires):
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status = self._disable_node(node)
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# if True ( node disabled ) break the loop
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if status:
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break
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else:
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status = False
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node['status'] = status
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# make sure the disable request was successful
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if not self.get_node_status(node):
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# if the node failed at any step no reason to move it to
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# the next step
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failed_nodes.append(node)
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self.nodes.remove(node) #
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else:
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succeeded_nodes.append(node)
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nodes = succeeded_nodes
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if enable_fencing:
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nodes = self.fencer.fence(nodes=nodes)
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"""
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@todo this code needs to be commented for the time being till we fix
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nova bug found in state, which always go up afer enable or disable. We
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will use get_node_details for the time being from the main script to
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get nodes details before evacuating ...
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succeeded_nodes = []
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for node in nodes:
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node['instances'] = self.driver.get_node_instances(node)
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succeeded_nodes.append(node)
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nodes = succeeded_nodes
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"""
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# Start evacuation calls ...
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evacuated_nodes = []
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for i in range(0, self.retires):
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try:
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time.sleep(self.wait)
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nodes = self.evacuate_nodes(nodes)
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if not nodes:
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break
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evacuated_nodes = nodes
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except Exception as e:
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LOG.error(e)
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return evacuated_nodes, failed_nodes
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def get_node_instances(self, node):
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return self.client.get_hypervisor_instances(node)
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def disable_node(self, node):
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return self.client.disable_node(node)
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def get_node_status(self, node):
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return self.client.get_node_status(node)
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def is_node_disabled(self, node):
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return self.client.get_node_status(node)
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def evacuate_nodes(self, nodes):
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return self.client.evacuate(
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nodes, shared_storage=self.evacuator_conf['shared_storage'])
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def get_info(self):
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"""
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To be implemented.
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Get Driver Information
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:return: Dict contains driver information
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"""
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raise NotImplementedError
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