OpenStack Networking (Neutron)
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# Copyright 2016 Hewlett Packard Enterprise Development LP
#
# 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.
import collections
from neutron_lib.api.definitions import portbindings
from neutron_lib.plugins import directory
from oslo_log import helpers as log_helpers
from oslo_log import log as logging
import oslo_messaging
from sqlalchemy.orm import exc
from neutron.api.rpc.callbacks import events
from neutron.api.rpc.callbacks.producer import registry
from neutron.api.rpc.callbacks import resources
from neutron.api.rpc.handlers import resources_rpc
from neutron.common import rpc as n_rpc
from neutron.db import api as db_api
from neutron.objects import trunk as trunk_objects
from neutron.services.trunk import constants as trunk_consts
from neutron.services.trunk import exceptions as trunk_exc
from neutron.services.trunk.rpc import constants
LOG = logging.getLogger(__name__)
# This module contains stub (client-side) and skeleton (server-side)
# proxy code that executes in the Neutron server process space. This
# is needed if any of the trunk service plugin drivers has a remote
# component (e.g. agent), that needs to communicate with the Neutron
# Server.
# The Server side exposes the following remote methods:
#
# - lookup method to retrieve trunk details: used by the agent to learn
# about the trunk.
# - update methods for trunk and its subports: used by the agent to
# inform the server about local trunk status changes.
#
# For agent-side stub and skeleton proxy code, please look at agent.py
def trunk_by_port_provider(resource, port_id, context, **kwargs):
"""Provider callback to supply trunk information by parent port."""
return trunk_objects.Trunk.get_object(context, port_id=port_id)
class TrunkSkeleton(object):
"""Skeleton proxy code for agent->server communication."""
# API version history:
# 1.0 Initial version
target = oslo_messaging.Target(version='1.0',
namespace=constants.TRUNK_BASE_NAMESPACE)
_core_plugin = None
def __init__(self):
# Used to provide trunk lookups for the agent.
registry.provide(trunk_by_port_provider, resources.TRUNK)
self._connection = n_rpc.Connection()
self._connection.create_consumer(
constants.TRUNK_BASE_TOPIC, [self], fanout=False)
self._connection.consume_in_threads()
@property
def core_plugin(self):
if not self._core_plugin:
self._core_plugin = directory.get_plugin()
return self._core_plugin
@log_helpers.log_method_call
def update_subport_bindings(self, context, subports):
"""Update subport bindings to match trunk host binding."""
el = context.elevated()
ports_by_trunk_id = collections.defaultdict(list)
updated_ports = collections.defaultdict(list)
for s in subports:
ports_by_trunk_id[s['trunk_id']].append(s['port_id'])
for trunk_id, subport_ids in ports_by_trunk_id.items():
trunk = trunk_objects.Trunk.get_object(el, id=trunk_id)
if not trunk:
LOG.debug("Trunk not found. id: %s", trunk_id)
continue
trunk_updated_ports = self._process_trunk_subport_bindings(
el,
trunk,
subport_ids)
updated_ports[trunk.id].extend(trunk_updated_ports)
return updated_ports
def _safe_update_trunk(self, trunk, **kwargs):
for try_cnt in range(db_api.MAX_RETRIES):
try:
trunk.update(**kwargs)
break
except exc.StaleDataError as e:
if try_cnt < db_api.MAX_RETRIES - 1:
LOG.debug("Got StaleDataError exception: %s", e)
continue
else:
# re-raise when all tries failed
raise
def update_trunk_status(self, context, trunk_id, status):
"""Update the trunk status to reflect outcome of data plane wiring."""
with db_api.autonested_transaction(context.session):
trunk = trunk_objects.Trunk.get_object(context, id=trunk_id)
if trunk:
self._safe_update_trunk(trunk, status=status)
def _process_trunk_subport_bindings(self, context, trunk, port_ids):
"""Process port bindings for subports on the given trunk."""
updated_ports = []
trunk_port_id = trunk.port_id
trunk_port = self.core_plugin.get_port(context, trunk_port_id)
trunk_host = trunk_port.get(portbindings.HOST_ID)
migrating_to_host = trunk_port.get(
portbindings.PROFILE, {}).get('migrating_to')
if migrating_to_host and trunk_host != migrating_to_host:
# Trunk is migrating now, so lets update host of the subports
# to the new host already
trunk_host = migrating_to_host
# NOTE(status_police) Set the trunk in BUILD state before
# processing subport bindings. The trunk will stay in BUILD
# state until an attempt has been made to bind all subports
# passed here and the agent acknowledges the operation was
# successful.
self._safe_update_trunk(
trunk, status=trunk_consts.BUILD_STATUS)
for port_id in port_ids:
try:
updated_port = self._handle_port_binding(context, port_id,
trunk, trunk_host)
# NOTE(fitoduarte): consider trimming down the content
# of the port data structure.
updated_ports.append(updated_port)
except trunk_exc.SubPortBindingError as e:
LOG.error("Failed to bind subport: %s", e)
# NOTE(status_police) The subport binding has failed in a
# manner in which we cannot proceed and the user must take
# action to bring the trunk back to a sane state.
self._safe_update_trunk(
trunk, status=trunk_consts.ERROR_STATUS)
return []
except Exception as e:
msg = ("Failed to bind subport port %(port)s on trunk "
"%(trunk)s: %(exc)s")
LOG.error(msg, {'port': port_id, 'trunk': trunk.id, 'exc': e})
if len(port_ids) != len(updated_ports):
self._safe_update_trunk(
trunk, status=trunk_consts.DEGRADED_STATUS)
return updated_ports
def _handle_port_binding(self, context, port_id, trunk, trunk_host):
"""Bind the given port to the given host.
:param context: The context to use for the operation
:param port_id: The UUID of the port to be bound
:param trunk: The trunk that the given port belongs to
:param trunk_host: The host to bind the given port to
"""
port = self.core_plugin.update_port(
context, port_id,
{'port': {portbindings.HOST_ID: trunk_host,
'device_owner': trunk_consts.TRUNK_SUBPORT_OWNER}})
vif_type = port.get(portbindings.VIF_TYPE)
if vif_type == portbindings.VIF_TYPE_BINDING_FAILED:
raise trunk_exc.SubPortBindingError(port_id=port_id,
trunk_id=trunk.id)
return port
class TrunkStub(object):
"""Stub proxy code for server->agent communication."""
def __init__(self):
self._resource_rpc = resources_rpc.ResourcesPushRpcApi()
@log_helpers.log_method_call
def trunk_created(self, context, trunk):
"""Tell the agent about a trunk being created."""
self._resource_rpc.push(context, [trunk], events.CREATED)
@log_helpers.log_method_call
def trunk_deleted(self, context, trunk):
"""Tell the agent about a trunk being deleted."""
self._resource_rpc.push(context, [trunk], events.DELETED)
@log_helpers.log_method_call
def subports_added(self, context, subports):
"""Tell the agent about new subports to add."""
self._resource_rpc.push(context, subports, events.CREATED)
@log_helpers.log_method_call
def subports_deleted(self, context, subports):
"""Tell the agent about existing subports to remove."""
self._resource_rpc.push(context, subports, events.DELETED)