246 lines
11 KiB
Python
246 lines
11 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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import logging
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from oslo_db import exception as odb_exceptions
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from oslo_utils import excutils
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import pecan
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from wsme import types as wtypes
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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.controllers import health_monitor
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from octavia.api.v1.controllers import member
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from octavia.api.v1.types import pool as pool_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 PoolsController(base.BaseController):
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def __init__(self, load_balancer_id, listener_id=None):
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super(PoolsController, 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.handler = self.handler.pool
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@wsme_pecan.wsexpose(pool_types.PoolResponse, wtypes.text)
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def get(self, id):
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"""Gets a pool's details."""
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context = pecan.request.context.get('octavia_context')
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db_pool = self._get_db_pool(context.session, id)
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return self._convert_db_to_type(db_pool, pool_types.PoolResponse)
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@wsme_pecan.wsexpose([pool_types.PoolResponse], wtypes.text)
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def get_all(self, listener_id=None):
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"""Lists all pools on a listener or loadbalancer."""
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context = pecan.request.context.get('octavia_context')
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if listener_id is not None:
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self.listener_id = listener_id
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if self.listener_id:
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pools = self._get_db_listener(context.session,
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self.listener_id).pools
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else:
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pools = self.repositories.pool.get_all(
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context.session, load_balancer_id=self.load_balancer_id)
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return self._convert_db_to_type(pools, [pool_types.PoolResponse])
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def _get_affected_listener_ids(self, session, pool=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 pool:
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listener_ids = [l.id for l 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, pool=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, pool)):
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LOG.info("Pool cannot be created or modified because the Load "
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"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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def _validate_create_pool(self, lock_session, pool_dict):
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"""Validate creating pool on load balancer.
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Update database for load balancer and (optional) listener based on
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provisioning status.
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"""
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try:
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return self.repositories.create_pool_on_load_balancer(
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lock_session, pool_dict, listener_id=self.listener_id)
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except odb_exceptions.DBDuplicateEntry as de:
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if ['id'] == de.columns:
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raise exceptions.IDAlreadyExists()
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except odb_exceptions.DBError:
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# TODO(blogan): will have to do separate validation protocol
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# before creation or update since the exception messages
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# do not give any information as to what constraint failed
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raise exceptions.InvalidOption(value='', option='')
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def _send_pool_to_handler(self, session, db_pool):
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try:
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LOG.info("Sending Creation of Pool %s to handler", db_pool.id)
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self.handler.create(db_pool)
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except Exception:
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for listener_id in self._get_affected_listener_ids(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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session, listener_id, operating_status=constants.ERROR)
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db_pool = self._get_db_pool(session, db_pool.id)
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return self._convert_db_to_type(db_pool, pool_types.PoolResponse)
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@wsme_pecan.wsexpose(pool_types.PoolResponse, body=pool_types.PoolPOST,
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status_code=202)
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def post(self, pool):
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"""Creates a pool on a load balancer or listener.
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Note that this can optionally take a listener_id with which the pool
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should be associated as the listener's default_pool. If specified,
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the pool creation will fail if the listener specified already has
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a default_pool.
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"""
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# For some API requests the listener_id will be passed in the
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# pool_dict:
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context = pecan.request.context.get('octavia_context')
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pool.project_id = self._get_lb_project_id(context.session,
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self.load_balancer_id)
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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.Pool,
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pool.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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pool_dict = db_prepare.create_pool(
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pool.to_dict(render_unsets=True))
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if 'listener_id' in pool_dict:
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if pool_dict['listener_id'] is not None:
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self.listener_id = pool_dict.pop('listener_id')
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else:
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del pool_dict['listener_id']
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listener_repo = self.repositories.listener
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if self.listener_id and listener_repo.has_default_pool(
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lock_session, self.listener_id):
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raise exceptions.DuplicatePoolEntry()
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self._test_lb_and_listener_statuses(lock_session)
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pool_dict['operating_status'] = constants.OFFLINE
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pool_dict['load_balancer_id'] = self.load_balancer_id
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db_pool = self._validate_create_pool(lock_session, pool_dict)
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lock_session.commit()
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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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return self._send_pool_to_handler(context.session, db_pool)
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@wsme_pecan.wsexpose(pool_types.PoolResponse, wtypes.text,
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body=pool_types.PoolPUT, status_code=202)
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def put(self, id, pool):
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"""Updates a pool on a load balancer."""
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context = pecan.request.context.get('octavia_context')
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db_pool = self._get_db_pool(context.session, id)
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self._test_lb_and_listener_statuses(context.session, pool=db_pool)
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try:
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LOG.info("Sending Update of Pool %s to handler", id)
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self.handler.update(db_pool, pool)
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except Exception:
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with excutils.save_and_reraise_exception(reraise=False):
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for listener in db_pool.listeners:
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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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self.repositories.pool.update(
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context.session, db_pool.id,
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operating_status=constants.ERROR)
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db_pool = self._get_db_pool(context.session, id)
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return self._convert_db_to_type(db_pool, pool_types.PoolResponse)
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@wsme_pecan.wsexpose(None, wtypes.text, status_code=202)
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def delete(self, id):
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"""Deletes a pool from a load balancer."""
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context = pecan.request.context.get('octavia_context')
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db_pool = self._get_db_pool(context.session, id)
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if len(db_pool.l7policies) > 0:
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raise exceptions.PoolInUseByL7Policy(
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id=db_pool.id, l7policy_id=db_pool.l7policies[0].id)
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self._test_lb_and_listener_statuses(context.session, pool=db_pool)
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try:
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LOG.info("Sending Deletion of Pool %s to handler", db_pool.id)
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self.handler.delete(db_pool)
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except Exception:
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with excutils.save_and_reraise_exception(reraise=False):
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for listener in db_pool.listeners:
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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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self.repositories.pool.update(
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context.session, db_pool.id,
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operating_status=constants.ERROR)
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db_pool = self.repositories.pool.get(context.session, id=db_pool.id)
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return self._convert_db_to_type(db_pool, pool_types.PoolResponse)
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@pecan.expose()
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def _lookup(self, pool_id, *remainder):
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"""Overridden pecan _lookup method for custom routing.
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Verifies that the pool passed in the url exists, and if so decides
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which controller, if any, should control be passed.
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"""
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context = pecan.request.context.get('octavia_context')
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if pool_id and len(remainder) and (remainder[0] == 'members' or
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remainder[0] == 'healthmonitor'):
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controller = remainder[0]
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remainder = remainder[1:]
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db_pool = self.repositories.pool.get(context.session, id=pool_id)
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if not db_pool:
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LOG.info("Pool %s not found.", pool_id)
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raise exceptions.NotFound(resource=data_models.Pool._name(),
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id=pool_id)
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if controller == 'members':
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return member.MembersController(
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load_balancer_id=self.load_balancer_id,
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pool_id=db_pool.id,
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listener_id=self.listener_id), remainder
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elif controller == 'healthmonitor':
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return health_monitor.HealthMonitorController(
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load_balancer_id=self.load_balancer_id,
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pool_id=db_pool.id,
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listener_id=self.listener_id), remainder
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