fc5e46802e
Implements blueprint embrane-lbaas-driver This commit implements Embrane's driver for LBaaS, which uses Embrane's heleos(tm) appliances to provide Load Balancing. Change-Id: Ia76fbc8881d178cfe6df11a2cfe8e77d3f36094f
109 lines
4.5 KiB
Python
109 lines
4.5 KiB
Python
# Copyright 2014 Embrane, Inc.
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# All Rights Reserved.
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#
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# 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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#
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# @author: Ivar Lazzaro, Embrane, Inc. ivar@embrane.com
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from eventlet import greenthread
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from eventlet import queue
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from heleosapi import exceptions as h_exc
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from neutron.openstack.common import log as logging
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from neutron.plugins.embrane.common import contexts as ctx
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from neutron.services.loadbalancer.drivers.embrane.agent import lb_operations
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from neutron.services.loadbalancer.drivers.embrane import constants as econ
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LOG = logging.getLogger(__name__)
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class Dispatcher(object):
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def __init__(self, driver, async=True):
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self._async = async
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self._driver = driver
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self.sync_items = dict()
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self.handlers = lb_operations.handlers
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def dispatch_lb(self, d_context, *args, **kwargs):
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item = d_context.item
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event = d_context.event
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n_context = d_context.n_context
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chain = d_context.chain
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item_id = item["id"]
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if event in self.handlers:
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for f in self.handlers[event]:
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first_run = False
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if item_id not in self.sync_items:
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self.sync_items[item_id] = [queue.Queue()]
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first_run = True
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self.sync_items[item_id][0].put(
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ctx.OperationContext(event, n_context, item, chain, f,
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args, kwargs))
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if first_run:
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t = greenthread.spawn(self._consume_lb,
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item_id,
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self.sync_items[item_id][0],
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self._driver,
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self._async)
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self.sync_items[item_id].append(t)
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if not self._async:
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t = self.sync_items[item_id][1]
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t.wait()
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def _consume_lb(self, sync_item, sync_queue, driver, a_sync):
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current_state = None
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while True:
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try:
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if current_state == econ.DELETED:
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del self.sync_items[sync_item]
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return
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try:
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operation_context = sync_queue.get(
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block=a_sync,
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timeout=econ.QUEUE_TIMEOUT)
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except queue.Empty:
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del self.sync_items[sync_item]
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return
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(operation_context.chain and
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operation_context.chain.execute_all())
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transient_state = None
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try:
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transient_state = operation_context.function(
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driver, operation_context.n_context,
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operation_context.item, *operation_context.args,
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**operation_context.kwargs)
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except (h_exc.PendingDva, h_exc.DvaNotFound,
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h_exc.BrokenInterface, h_exc.DvaCreationFailed,
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h_exc.BrokenDva, h_exc.ConfigurationFailed) as ex:
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LOG.warning(econ.error_map[type(ex)], ex.message)
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except h_exc.DvaDeleteFailed as ex:
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LOG.warning(econ.error_map[type(ex)], ex.message)
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transient_state = econ.DELETED
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finally:
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# if the returned transient state is None, no operations
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# are required on the DVA status
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if transient_state == econ.DELETED:
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current_state = driver._delete_vip(
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operation_context.n_context,
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operation_context.item)
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# Error state cannot be reverted
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else:
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driver._update_vip_graph_state(
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operation_context.n_context,
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operation_context.item)
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except Exception:
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LOG.exception(_('Unhandled exception occurred'))
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