# octavia.api.v2.controllers.l7policy

# Source code for octavia.api.v2.controllers.l7policy

    #    Copyright 2016 Blue Box, an IBM Company
    #
    #    Licensed under the Apache License, Version 2.0 (the "License"); you may
    #    not use this file except in compliance with the License. You may obtain
    #    a copy of the License at
    #
    #         http://www.apache.org/licenses/LICENSE-2.0
    #
    #    Unless required by applicable law or agreed to in writing, software
    #    distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
    #    WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
    #    License for the specific language governing permissions and limitations
    #    under the License.

    from oslo_config import cfg
    from oslo_db import exception as odb_exceptions
    from oslo_log import log as logging
    from oslo_utils import excutils
    from pecan import expose as pecan_expose
    from pecan import request as pecan_request
    from wsme import types as wtypes
    from wsmeext import pecan as wsme_pecan

    from octavia.api.drivers import data_models as driver_dm
    from octavia.api.drivers import driver_factory
    from octavia.api.drivers import utils as driver_utils
    from octavia.api.v2.controllers import base
    from octavia.api.v2.controllers import l7rule
    from octavia.api.v2.types import l7policy as l7policy_types
    from octavia.common import constants
    from octavia.common import data_models
    from octavia.common import exceptions
    from octavia.common import validate
    from octavia.db import api as db_api
    from octavia.db import prepare as db_prepare

    CONF = cfg.CONF
    LOG = logging.getLogger(__name__)

    class L7PolicyController(base.BaseController):
        RBAC_TYPE = constants.RBAC_L7POLICY

        def __init__(self):
            super(L7PolicyController, self).__init__()

        @wsme_pecan.wsexpose(l7policy_types.L7PolicyRootResponse, wtypes.text,
                             [wtypes.text], ignore_extra_args=True)
        def get(self, id, fields=None):
            """Gets a single l7policy's details."""
            context = pecan_request.context.get('octavia_context')
            db_l7policy = self._get_db_l7policy(context.session, id,
                                                show_deleted=False)

            self._auth_validate_action(context, db_l7policy.project_id,
                                       constants.RBAC_GET_ONE)

            result = self._convert_db_to_type(
                db_l7policy, l7policy_types.L7PolicyResponse)
            if fields is not None:
                result = self._filter_fields([result], fields)[0]
            return l7policy_types.L7PolicyRootResponse(l7policy=result)

        @wsme_pecan.wsexpose(l7policy_types.L7PoliciesRootResponse, wtypes.text,
                             [wtypes.text], ignore_extra_args=True)
        def get_all(self, project_id=None, fields=None):
            """Lists all l7policies of a listener."""
            pcontext = pecan_request.context
            context = pcontext.get('octavia_context')

            query_filter = self._auth_get_all(context, project_id)

            db_l7policies, links = self.repositories.l7policy.get_all_API_list(
                context.session, show_deleted=False,
                pagination_helper=pcontext.get(constants.PAGINATION_HELPER),
                **query_filter)
            result = self._convert_db_to_type(
                db_l7policies, [l7policy_types.L7PolicyResponse])
            if fields is not None:
                result = self._filter_fields(result, fields)
            return l7policy_types.L7PoliciesRootResponse(
                l7policies=result, l7policies_links=links)

        def _test_lb_and_listener_statuses(self, session, lb_id, listener_ids):
            """Verify load balancer is in a mutable state."""
            if not self.repositories.test_and_set_lb_and_listeners_prov_status(
                    session, lb_id,
                    constants.PENDING_UPDATE, constants.PENDING_UPDATE,
                    listener_ids=listener_ids):
                LOG.info("L7Policy cannot be created or modified because the "
                         "Load Balancer is in an immutable state")
                raise exceptions.ImmutableObject(resource='Load Balancer',
                                                 id=lb_id)

        def _validate_create_l7policy(self, lock_session, l7policy_dict):
            try:
                # Set the default HTTP redirect code here so it's explicit
                if ((l7policy_dict.get('redirect_url') or
                    l7policy_dict.get('redirect_prefix')) and
                        not l7policy_dict.get('redirect_http_code')):
                    l7policy_dict['redirect_http_code'] = 302

                return self.repositories.l7policy.create(lock_session,
                                                         **l7policy_dict)
            except odb_exceptions.DBDuplicateEntry:
                raise exceptions.IDAlreadyExists()
            except odb_exceptions.DBError:
                # TODO(blogan): will have to do separate validation protocol
                # before creation or update since the exception messages
                # do not give any information as to what constraint failed
                raise exceptions.InvalidOption(value='', option='')

        @wsme_pecan.wsexpose(l7policy_types.L7PolicyRootResponse,
                             body=l7policy_types.L7PolicyRootPOST, status_code=201)
        def post(self, l7policy_):
            """Creates a l7policy on a listener."""
            l7policy = l7policy_.l7policy
            context = pecan_request.context.get('octavia_context')
            # Verify the parent listener exists
            listener_id = l7policy.listener_id
            listener = self._get_db_listener(
                context.session, listener_id)
            load_balancer_id = listener.load_balancer_id
            l7policy.project_id, provider = self._get_lb_project_id_provider(
                context.session, load_balancer_id)
            # Make sure any pool specified by redirect_pool_id exists
            if l7policy.redirect_pool_id:
                db_pool = self._get_db_pool(
                    context.session, l7policy.redirect_pool_id)
                self._validate_protocol(listener.protocol, db_pool.protocol)

            self._auth_validate_action(context, l7policy.project_id,
                                       constants.RBAC_POST)

            # Load the driver early as it also provides validation
            driver = driver_factory.get_driver(provider)

            lock_session = db_api.get_session(autocommit=False)
            try:
                if self.repositories.check_quota_met(
                        context.session,
                        lock_session,
                        data_models.L7Policy,
                        l7policy.project_id):
                    raise exceptions.QuotaException(
                        resource=data_models.L7Policy._name())

                l7policy_dict = db_prepare.create_l7policy(
                    l7policy.to_dict(render_unsets=True),
                    load_balancer_id, listener_id)

                self._test_lb_and_listener_statuses(
                    lock_session, lb_id=load_balancer_id,
                    listener_ids=[listener_id])
                db_l7policy = self._validate_create_l7policy(
                    lock_session, l7policy_dict)

                # Prepare the data for the driver data model
                provider_l7policy = (
                    driver_utils.db_l7policy_to_provider_l7policy(db_l7policy))

                # Dispatch to the driver
                LOG.info("Sending create L7 Policy %s to provider %s",
                         db_l7policy.id, driver.name)
                driver_utils.call_provider(
                    driver.name, driver.l7policy_create, provider_l7policy)

                lock_session.commit()
            except Exception:
                with excutils.save_and_reraise_exception():
                    lock_session.rollback()

            db_l7policy = self._get_db_l7policy(context.session, db_l7policy.id)
            result = self._convert_db_to_type(db_l7policy,
                                              l7policy_types.L7PolicyResponse)
            return l7policy_types.L7PolicyRootResponse(l7policy=result)

        def _graph_create(self, lock_session, policy_dict):
            load_balancer_id = policy_dict.pop('load_balancer_id', None)
            listener_id = policy_dict['listener_id']
            policy_dict = db_prepare.create_l7policy(
                policy_dict, load_balancer_id, listener_id)
            rules = policy_dict.pop('l7rules', []) or []
            db_policy = self._validate_create_l7policy(lock_session, policy_dict)

            new_rules = []
            for r in rules:
                r['project_id'] = db_policy.project_id
                new_rules.append(
                    l7rule.L7RuleController(db_policy.id)._graph_create(
                        lock_session, r))

            db_policy.l7rules = new_rules
            return db_policy

        @wsme_pecan.wsexpose(l7policy_types.L7PolicyRootResponse,
                             wtypes.text, body=l7policy_types.L7PolicyRootPUT,
                             status_code=200)
        def put(self, id, l7policy_):
            """Updates a l7policy."""
            l7policy = l7policy_.l7policy
            l7policy_dict = validate.sanitize_l7policy_api_args(
                l7policy.to_dict(render_unsets=False))
            # Reset renamed attributes
            for attr, val in l7policy_types.L7PolicyPUT._type_to_model_map.items():
                if val in l7policy_dict:
                    l7policy_dict[attr] = l7policy_dict.pop(val)
            sanitized_l7policy = l7policy_types.L7PolicyPUT(**l7policy_dict)
            context = pecan_request.context.get('octavia_context')

            db_l7policy = self._get_db_l7policy(context.session, id,
                                                show_deleted=False)
            listener = self._get_db_listener(
                context.session, db_l7policy.listener_id)
            # Make sure any specified redirect_pool_id exists
            if l7policy_dict.get('redirect_pool_id'):
                db_pool = self._get_db_pool(
                    context.session, l7policy_dict['redirect_pool_id'])
                self._validate_protocol(listener.protocol, db_pool.protocol)
            load_balancer_id, listener_id = self._get_listener_and_loadbalancer_id(
                db_l7policy)
            project_id, provider = self._get_lb_project_id_provider(
                context.session, load_balancer_id)

            self._auth_validate_action(context, project_id, constants.RBAC_PUT)

            # Load the driver early as it also provides validation
            driver = driver_factory.get_driver(provider)

            with db_api.get_lock_session() as lock_session:

                self._test_lb_and_listener_statuses(lock_session,
                                                    lb_id=load_balancer_id,
                                                    listener_ids=[listener_id])

                # Prepare the data for the driver data model
                l7policy_dict = sanitized_l7policy.to_dict(render_unsets=False)
                l7policy_dict['id'] = id
                provider_l7policy_dict = (
                    driver_utils.l7policy_dict_to_provider_dict(l7policy_dict))

                # Also prepare the baseline object data
                old_provider_l7policy = (
                    driver_utils.db_l7policy_to_provider_l7policy(db_l7policy))

                # Dispatch to the driver
                LOG.info("Sending update L7 Policy %s to provider %s",
                         id, driver.name)
                driver_utils.call_provider(
                    driver.name, driver.l7policy_update,
                    old_provider_l7policy,
                    driver_dm.L7Policy.from_dict(provider_l7policy_dict))

                # Update the database to reflect what the driver just accepted
                sanitized_l7policy.provisioning_status = constants.PENDING_UPDATE
                db_l7policy_dict = sanitized_l7policy.to_dict(render_unsets=False)
                self.repositories.l7policy.update(lock_session, id,
                                                  **db_l7policy_dict)

            # Force SQL alchemy to query the DB, otherwise we get inconsistent
            # results
            context.session.expire_all()
            db_l7policy = self._get_db_l7policy(context.session, id)
            result = self._convert_db_to_type(db_l7policy,
                                              l7policy_types.L7PolicyResponse)
            return l7policy_types.L7PolicyRootResponse(l7policy=result)

        @wsme_pecan.wsexpose(None, wtypes.text, status_code=204)
        def delete(self, id):
            """Deletes a l7policy."""
            context = pecan_request.context.get('octavia_context')
            db_l7policy = self._get_db_l7policy(context.session, id,
                                                show_deleted=False)
            load_balancer_id, listener_id = self._get_listener_and_loadbalancer_id(
                db_l7policy)
            project_id, provider = self._get_lb_project_id_provider(
                context.session, load_balancer_id)

            self._auth_validate_action(context, project_id, constants.RBAC_DELETE)

            if db_l7policy.provisioning_status == constants.DELETED:
                return

            # Load the driver early as it also provides validation
            driver = driver_factory.get_driver(provider)

            with db_api.get_lock_session() as lock_session:

                self._test_lb_and_listener_statuses(lock_session,
                                                    lb_id=load_balancer_id,
                                                    listener_ids=[listener_id])
                self.repositories.l7policy.update(
                    lock_session, db_l7policy.id,
                    provisioning_status=constants.PENDING_DELETE)

                LOG.info("Sending delete L7 Policy %s to provider %s",
                         id, driver.name)
                provider_l7policy = driver_utils.db_l7policy_to_provider_l7policy(
                    db_l7policy)
                driver_utils.call_provider(driver.name, driver.l7policy_delete,
                                           provider_l7policy)

        @pecan_expose()
        def _lookup(self, l7policy_id, *remainder):
            """Overridden pecan _lookup method for custom routing.

            Verifies that the l7policy passed in the url exists, and if so decides
            which controller, if any, should control be passed.
            """
            context = pecan_request.context.get('octavia_context')
            if l7policy_id and remainder and remainder[0] == 'rules':
                remainder = remainder[1:]
                db_l7policy = self.repositories.l7policy.get(
                    context.session, id=l7policy_id)
                if not db_l7policy:
                    LOG.info("L7Policy %s not found.", l7policy_id)
                    raise exceptions.NotFound(
                        resource='L7Policy', id=l7policy_id)
                return l7rule.L7RuleController(
                    l7policy_id=db_l7policy.id), remainder
            return None

this page last updated: 2020-04-10 18:17:54

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