195 lines
8.4 KiB
Python
195 lines
8.4 KiB
Python
# Copyright 2014 Rackspace
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# Copyright 2016 Blue Box, an IBM Company
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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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from oslo_db import exception as odb_exceptions
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from oslo_log import log as logging
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from oslo_utils import excutils
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import pecan
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from wsmeext import pecan as wsme_pecan
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from octavia.api.v1.controllers import base
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from octavia.api.v1.types import health_monitor as hm_types
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from octavia.common import constants
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from octavia.common import data_models
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from octavia.common import exceptions
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from octavia.db import api as db_api
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from octavia.db import prepare as db_prepare
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LOG = logging.getLogger(__name__)
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class HealthMonitorController(base.BaseController):
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def __init__(self, load_balancer_id, pool_id, listener_id=None):
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super(HealthMonitorController, self).__init__()
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self.load_balancer_id = load_balancer_id
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self.listener_id = listener_id
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self.pool_id = pool_id
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self.handler = self.handler.health_monitor
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def _get_db_hm(self, session):
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"""Gets the current health monitor object from the database."""
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db_hm = self.repositories.health_monitor.get(
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session, pool_id=self.pool_id)
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if not db_hm:
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LOG.info("Health Monitor for Pool %s was not found",
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self.pool_id)
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raise exceptions.NotFound(
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resource=data_models.HealthMonitor._name(),
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id=self.pool_id)
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return db_hm
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@wsme_pecan.wsexpose(hm_types.HealthMonitorResponse)
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def get_all(self):
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"""Gets a single health monitor's details."""
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# NOTE(blogan): since a pool can only have one health monitor
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# we are using the get_all method to only get the single health monitor
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context = pecan.request.context.get('octavia_context')
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db_hm = self._get_db_hm(context.session)
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return self._convert_db_to_type(db_hm, hm_types.HealthMonitorResponse)
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def _get_affected_listener_ids(self, session, hm=None):
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"""Gets a list of all listeners this request potentially affects."""
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listener_ids = []
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if hm:
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listener_ids = [l.id for l in hm.pool.listeners]
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else:
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pool = self._get_db_pool(session, self.pool_id)
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listener_ids = [listener.id for listener in pool.listeners]
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if self.listener_id and self.listener_id not in listener_ids:
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listener_ids.append(self.listener_id)
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return listener_ids
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def _test_lb_and_listener_statuses(self, session, hm=None):
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"""Verify load balancer is in a mutable state."""
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# We need to verify that any listeners referencing this pool are also
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# mutable
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if not self.repositories.test_and_set_lb_and_listeners_prov_status(
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session, self.load_balancer_id,
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constants.PENDING_UPDATE, constants.PENDING_UPDATE,
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listener_ids=self._get_affected_listener_ids(session, hm)):
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LOG.info("Health Monitor cannot be created or modified "
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"because the Load Balancer is in an immutable state")
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lb_repo = self.repositories.load_balancer
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db_lb = lb_repo.get(session, id=self.load_balancer_id)
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raise exceptions.ImmutableObject(resource=db_lb._name(),
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id=self.load_balancer_id)
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@wsme_pecan.wsexpose(hm_types.HealthMonitorResponse,
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body=hm_types.HealthMonitorPOST, status_code=202)
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def post(self, health_monitor):
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"""Creates a health monitor on a pool."""
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context = pecan.request.context.get('octavia_context')
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health_monitor.project_id = self._get_lb_project_id(
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context.session, self.load_balancer_id)
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try:
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db_hm = self.repositories.health_monitor.get(
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context.session, pool_id=self.pool_id)
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if db_hm:
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raise exceptions.DuplicateHealthMonitor()
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except exceptions.NotFound:
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pass
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lock_session = db_api.get_session(autocommit=False)
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if self.repositories.check_quota_met(
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context.session,
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lock_session,
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data_models.HealthMonitor,
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health_monitor.project_id):
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lock_session.rollback()
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raise exceptions.QuotaException
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try:
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hm_dict = db_prepare.create_health_monitor(
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health_monitor.to_dict(render_unsets=True), self.pool_id)
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self._test_lb_and_listener_statuses(lock_session)
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db_hm = self.repositories.health_monitor.create(lock_session,
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**hm_dict)
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db_new_hm = self._get_db_hm(lock_session)
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lock_session.commit()
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except odb_exceptions.DBError:
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lock_session.rollback()
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raise exceptions.InvalidOption(value=hm_dict.get('type'),
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option='type')
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except Exception:
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with excutils.save_and_reraise_exception():
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lock_session.rollback()
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try:
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LOG.info("Sending Creation of Health Monitor for Pool %s to "
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"handler", self.pool_id)
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self.handler.create(db_hm)
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except Exception:
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for listener_id in self._get_affected_listener_ids(
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context.session):
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with excutils.save_and_reraise_exception(reraise=False):
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self.repositories.listener.update(
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context.session, listener_id,
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operating_status=constants.ERROR)
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return self._convert_db_to_type(db_new_hm,
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hm_types.HealthMonitorResponse)
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@wsme_pecan.wsexpose(hm_types.HealthMonitorResponse,
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body=hm_types.HealthMonitorPUT, status_code=202)
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def put(self, health_monitor):
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"""Updates a health monitor.
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Updates a health monitor on a pool if it exists. Only one health
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monitor is allowed per pool so there is no need for a health monitor
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id.
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"""
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context = pecan.request.context.get('octavia_context')
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db_hm = self._get_db_hm(context.session)
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self._test_lb_and_listener_statuses(context.session, hm=db_hm)
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try:
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LOG.info("Sending Update of Health Monitor for Pool %s to handler",
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self.pool_id)
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self.handler.update(db_hm, health_monitor)
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except Exception:
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with excutils.save_and_reraise_exception(reraise=False):
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for listener_id in self._get_affected_listener_ids(
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context.session, db_hm):
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self.repositories.listener.update(
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context.session, listener_id,
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operating_status=constants.ERROR)
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db_hm = self._get_db_hm(context.session)
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return self._convert_db_to_type(db_hm, hm_types.HealthMonitorResponse)
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@wsme_pecan.wsexpose(None, status_code=202)
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def delete(self):
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"""Deletes a health monitor."""
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context = pecan.request.context.get('octavia_context')
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db_hm = self._get_db_hm(context.session)
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self._test_lb_and_listener_statuses(context.session, hm=db_hm)
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try:
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LOG.info("Sending Deletion of Health Monitor for Pool %s to "
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"handler", self.pool_id)
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self.handler.delete(db_hm)
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except Exception:
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with excutils.save_and_reraise_exception(reraise=False):
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for listener_id in self._get_affected_listener_ids(
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context.session, db_hm):
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self.repositories.listener.update(
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context.session, listener_id,
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operating_status=constants.ERROR)
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db_hm = self.repositories.health_monitor.get(
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context.session, pool_id=self.pool_id)
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return self._convert_db_to_type(db_hm, hm_types.HealthMonitorResponse)
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