243 lines
11 KiB
Python
243 lines
11 KiB
Python
# Copyright 2014 Rackspace
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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 prepare as db_prepare
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from octavia.i18n import _LI
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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):
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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.repositories.pool.get(context.session, id=id)
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if not db_pool:
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LOG.info(_LI("Pool %s not found."), id)
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raise exceptions.NotFound(resource=data_models.Pool._name(), id=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])
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def get_all(self):
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"""Lists all pools on a listener."""
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context = pecan.request.context.get('octavia_context')
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default_pool = self.repositories.listener.get(
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context.session, id=self.listener_id).default_pool
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if default_pool:
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default_pool = [default_pool]
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else:
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default_pool = []
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return self._convert_db_to_type(default_pool,
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[pool_types.PoolResponse])
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def _test_lb_status(self, session):
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"""Verify load balancer is in a mutable status."""
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if not self.repositories.test_and_set_lb_and_listener_prov_status(
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session, self.load_balancer_id, self.listener_id,
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constants.PENDING_UPDATE, constants.PENDING_UPDATE):
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LOG.info(_LI("Pool cannot be created 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, session, sp_dict, pool_dict):
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"""Validate creating pool on load balancer.
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Update database for load balancer and listener based on provisioning
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status.
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"""
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try:
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db_pool = self.repositories.create_pool_on_listener(
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session, self.listener_id, pool_dict, sp_dict=sp_dict)
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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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# Setting LB and Listener back to active because this is just a
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# validation failure
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self.repositories.load_balancer.update(
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session, self.load_balancer_id,
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provisioning_status=constants.ACTIVE)
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self.repositories.listener.update(
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session, self.listener_id,
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provisioning_status=constants.ACTIVE)
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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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try:
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LOG.info(_LI("Sending Creation of Pool %s to handler"),
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db_pool.id)
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self.handler.create(db_pool)
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except Exception:
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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, self.listener_id,
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operating_status=constants.ERROR)
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db_pool = self.repositories.pool.get(session, id=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 listener.
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This does not allow more than one pool to be on a listener so once one
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is created, another cannot be created until the first one has been
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deleted.
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"""
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context = pecan.request.context.get('octavia_context')
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if self.repositories.listener.has_pool(
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context.session, self.listener_id):
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raise exceptions.DuplicatePoolEntry()
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# Verify load balancer is in a mutable status. If so it can be assumed
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# that the listener is also in a mutable status because a load balancer
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# will only be ACTIVE when all it's listeners as ACTIVE.
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self._test_lb_status(context.session)
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pool_dict = db_prepare.create_pool(pool.to_dict())
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sp_dict = pool_dict.pop('session_persistence', None)
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return self._validate_create_pool(context.session, sp_dict, pool_dict)
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def _test_lb_status_put(self, session):
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"""Verify load balancer is in a mutable status for put method."""
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if not self.repositories.test_and_set_lb_and_listener_prov_status(
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session, self.load_balancer_id, self.listener_id,
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constants.PENDING_UPDATE, constants.PENDING_UPDATE):
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LOG.info(_LI("Pool %s cannot be updated because the Load "
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"Balancer is in an immutable state"), id)
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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(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 listener."""
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context = pecan.request.context.get('octavia_context')
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db_pool = self.repositories.pool.get(context.session, id=id)
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if not db_pool:
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LOG.info(_LI("Pool %s not found."), id)
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raise exceptions.NotFound(resource=data_models.Pool._name(), id=id)
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# Verify load balancer is in a mutable status. If so it can be assumed
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# that the listener is also in a mutable status because a load balancer
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# will only be ACTIVE when all it's listeners as ACTIVE.
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self._test_lb_status_put(context.session)
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try:
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LOG.info(_LI("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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self.repositories.listener.update(
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context.session, self.listener_id,
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operating_status=constants.ERROR)
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db_pool = self.repositories.pool.get(context.session, id=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 listener."""
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context = pecan.request.context.get('octavia_context')
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db_pool = self.repositories.pool.get(context.session, id=id)
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if not db_pool:
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LOG.info(_LI("Pool %s not found."), id)
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raise exceptions.NotFound(resource=data_models.Pool._name(), id=id)
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# Verify load balancer is in a mutable status. If so it can be assumed
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# that the listener is also in a mutable status because a load balancer
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# will only be ACTIVE when all it's listeners as ACTIVE.
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if not self.repositories.test_and_set_lb_and_listener_prov_status(
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context.session, self.load_balancer_id, self.listener_id,
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constants.PENDING_UPDATE, constants.PENDING_UPDATE):
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LOG.info(_LI("Pool %s cannot be deleted because the Load "
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"Balancer is in an immutable state"), id)
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lb_repo = self.repositories.load_balancer
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db_lb = lb_repo.get(context.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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db_pool = self.repositories.pool.get(context.session, id=id)
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try:
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LOG.info(_LI("Sending Deletion of Pool %s to handler"),
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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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self.repositories.listener.update(
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context.session, self.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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"""Overriden 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':
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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(_LI("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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return member.MembersController(
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load_balancer_id=self.load_balancer_id,
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listener_id=self.listener_id,
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pool_id=db_pool.id), remainder
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if pool_id and len(remainder) and remainder[0] == 'healthmonitor':
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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(_LI("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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return health_monitor.HealthMonitorController(
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load_balancer_id=self.load_balancer_id,
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listener_id=self.listener_id,
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pool_id=db_pool.id), remainder
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