113 lines
4.2 KiB
Python
113 lines
4.2 KiB
Python
# Licensed under the Apache License, Version 2.0 (the "License"); you may
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# not use this file except in compliance with the License. You may obtain
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# 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, WITHOUT
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# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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# License for the specific language governing permissions and limitations
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# under the License.
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from neutron._i18n import _LI
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from neutron.common import exceptions as n_exc
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from oslo_config import cfg
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from oslo_log import log as logging
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import stevedore
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from gbpservice.neutron.services.servicechain.plugins.ncp import config # noqa
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from gbpservice.neutron.services.servicechain.plugins.ncp import model
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LOG = logging.getLogger(__name__)
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class NodeDriverManager(stevedore.named.NamedExtensionManager):
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"""Route servicechain APIs to servicechain node drivers.
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"""
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def __init__(self):
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# Registered node drivers, keyed by name.
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self.drivers = {}
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# Ordered list of node drivers.
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self.ordered_drivers = []
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names = cfg.CONF.node_composition_plugin.node_drivers
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LOG.info(_LI("Configured service chain node driver names: %s"), names)
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super(NodeDriverManager,
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self).__init__(
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'gbpservice.neutron.servicechain.ncp_drivers', names,
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invoke_on_load=True, name_order=True)
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LOG.info(_LI(
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"Loaded service chain node driver names: %s"), self.names())
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self._register_drivers()
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def _register_drivers(self):
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"""Register all service chain node drivers."""
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for ext in self:
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self.drivers[ext.name] = ext
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self.ordered_drivers.append(ext)
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LOG.info(_LI("Registered service chain node drivers: %s"),
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[driver.name for driver in self.ordered_drivers])
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def initialize(self):
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"""Initialize all the service chain node drivers."""
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self.native_bulk_support = True
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for driver in self.ordered_drivers:
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LOG.info(_LI("Initializing service chain node drivers '%s'"),
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driver.name)
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driver.obj.initialize(driver.name)
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self.native_bulk_support &= getattr(driver.obj,
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'native_bulk_support', True)
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def schedule_deploy(self, context):
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"""Schedule Node Driver for Node creation.
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Given a NodeContext, this method returns the driver capable of creating
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the specific node.
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"""
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for driver in self.ordered_drivers:
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try:
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driver.obj.validate_create(context)
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model.set_node_owner(context, driver.obj.name)
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return driver.obj
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except n_exc.NeutronException as e:
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LOG.warning(e.message)
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def schedule_destroy(self, context):
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"""Schedule Node Driver for Node disruption.
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Given a NodeContext, this method returns the driver capable of
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destroying the specific node.
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"""
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driver = self.get_owning_driver(context)
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if driver:
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model.unset_node_owner(context)
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return driver
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def schedule_update(self, context):
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"""Schedule Node Driver for Node Update.
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Given a NodeContext, this method returns the driver capable of updating
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the specific node.
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"""
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driver = self.get_owning_driver(context)
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if driver:
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driver.validate_update(context)
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return driver
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def clear_node_owner(self, context):
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"""Remove Node Driver ownership set for a Node
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Given a NodeContext, this method removes the Node owner mapping in DB.
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This method is used when we want to perform a disruptive chain update
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by deleting and recreating the Node instances
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"""
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model.unset_node_owner(context)
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def get_owning_driver(self, context):
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owner = model.get_node_owner(context)
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if owner:
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driver = self.drivers.get(owner[0].driver_name)
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return driver.obj if driver else None
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