OpenStack Networking (Neutron)
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# Copyright 2016 Hewlett Packard Enterprise Development, LP
#
# All Rights Reserved.
#
# 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 neutron_lib.callbacks import events
from neutron_lib.callbacks import registry
from neutron_lib.callbacks import resources
from neutron_lib import constants
from neutron_lib.db import api as db_api
from neutron_lib.db import resource_extend
from neutron_lib.db import utils as db_utils
from neutron_lib import exceptions as n_exc
from neutron_lib.plugins import directory
from oslo_concurrency import lockutils
from oslo_config import cfg
from oslo_db import exception as db_exc
from oslo_log import helpers as log_helpers
from oslo_utils import uuidutils
from neutron.db import segments_db as db
from neutron.extensions import segment as extension
from neutron import manager
from neutron.objects import base as base_obj
from neutron.objects import network
from neutron.services.segments import exceptions
_USER_CONFIGURED_SEGMENT_PLUGIN = None
FOR_NET_DELETE = 'for_net_delete'
def check_user_configured_segment_plugin():
global _USER_CONFIGURED_SEGMENT_PLUGIN
# _USER_CONFIGURED_SEGMENT_PLUGIN will contain 3 possible values:
# 1. None, this just happens during neutron-server startup.
# 2. True, this means that users configure the 'segments'
# service plugin in neutron config file.
# 3. False, this means that can not find 'segments' service
# plugin in neutron config file.
# This function just load once to store the result
# into _USER_CONFIGURED_SEGMENT_PLUGIN during neutron-server startup.
if _USER_CONFIGURED_SEGMENT_PLUGIN is None:
segment_class = 'neutron.services.segments.plugin.Plugin'
_USER_CONFIGURED_SEGMENT_PLUGIN = any(
p in cfg.CONF.service_plugins for p in ['segments', segment_class])
return _USER_CONFIGURED_SEGMENT_PLUGIN
class SegmentDbMixin(object):
"""Mixin class to add segment."""
@staticmethod
def _make_segment_dict(segment_obj, fields=None):
res = {'id': segment_obj['id'],
'network_id': segment_obj['network_id'],
'name': segment_obj['name'],
'description': segment_obj['description'],
db.PHYSICAL_NETWORK: segment_obj[db.PHYSICAL_NETWORK],
db.NETWORK_TYPE: segment_obj[db.NETWORK_TYPE],
db.SEGMENTATION_ID: segment_obj[db.SEGMENTATION_ID],
'hosts': segment_obj['hosts'],
'segment_index': segment_obj['segment_index']}
resource_extend.apply_funcs('segments', res, segment_obj.db_obj)
return db_utils.resource_fields(res, fields)
def _get_segment(self, context, segment_id):
segment = network.NetworkSegment.get_object(context, id=segment_id)
if not segment:
raise exceptions.SegmentNotFound(segment_id=segment_id)
return segment
@log_helpers.log_method_call
def create_segment(self, context, segment):
"""Create a segment."""
segment = segment['segment']
segment_id = segment.get('id') or uuidutils.generate_uuid()
try:
new_segment = self._create_segment_db(context, segment_id, segment)
except db_exc.DBReferenceError:
raise n_exc.NetworkNotFound(net_id=segment['network_id'])
registry.notify(resources.SEGMENT, events.AFTER_CREATE, self,
context=context, segment=new_segment)
return self._make_segment_dict(new_segment)
def _create_segment_db(self, context, segment_id, segment):
with db_api.CONTEXT_WRITER.using(context):
network_id = segment['network_id']
physical_network = segment[extension.PHYSICAL_NETWORK]
if physical_network == constants.ATTR_NOT_SPECIFIED:
physical_network = None
network_type = segment[extension.NETWORK_TYPE]
segmentation_id = segment[extension.SEGMENTATION_ID]
if segmentation_id == constants.ATTR_NOT_SPECIFIED:
segmentation_id = None
name = segment['name']
if name == constants.ATTR_NOT_SPECIFIED:
name = None
description = segment['description']
if description == constants.ATTR_NOT_SPECIFIED:
description = None
args = {'id': segment_id,
'network_id': network_id,
'name': name,
'description': description,
db.PHYSICAL_NETWORK: physical_network,
db.NETWORK_TYPE: network_type,
db.SEGMENTATION_ID: segmentation_id}
# Calculate the index of segment
segment_index = 0
segments = self.get_segments(
context,
filters={'network_id': [network_id]},
fields=['segment_index'],
sorts=[('segment_index', True)])
if segments:
# NOTE(xiaohhui): The new index is the last index + 1, this
# may cause discontinuous segment_index. But segment_index
# can functionally work as the order index for segments.
segment_index = (segments[-1].get('segment_index') + 1)
args['segment_index'] = segment_index
new_segment = network.NetworkSegment(context, **args)
new_segment.create()
# Do some preliminary operations before committing the segment to
# db
registry.notify(
resources.SEGMENT, events.PRECOMMIT_CREATE, self,
context=context, segment=new_segment)
# The new segment might have been updated by the callbacks
# subscribed to the PRECOMMIT_CREATE event. So update it in the DB
new_segment.update()
return new_segment
@log_helpers.log_method_call
def update_segment(self, context, uuid, segment):
"""Update an existing segment."""
segment = segment['segment']
with db_api.CONTEXT_WRITER.using(context):
curr_segment = self._get_segment(context, uuid)
curr_segment.update_fields(segment)
curr_segment.update()
return self._make_segment_dict(curr_segment)
@log_helpers.log_method_call
def get_segment(self, context, uuid, fields=None):
segment_db = self._get_segment(context, uuid)
return self._make_segment_dict(segment_db, fields)
@log_helpers.log_method_call
def get_segments(self, context, filters=None, fields=None,
sorts=None, limit=None, marker=None,
page_reverse=False):
filters = filters or {}
pager = base_obj.Pager(sorts, limit, page_reverse, marker)
segment_objs = network.NetworkSegment.get_objects(
context, _pager=pager, **filters)
return [self._make_segment_dict(obj) for obj in segment_objs]
@log_helpers.log_method_call
def get_segments_count(self, context, filters=None):
filters = filters or {}
return network.NetworkSegment.count(context, **filters)
@log_helpers.log_method_call
def get_segments_by_hosts(self, context, hosts):
if not hosts:
return []
segment_host_mapping = network.SegmentHostMapping.get_objects(
context, host=hosts)
return list({mapping.segment_id for mapping in segment_host_mapping})
@log_helpers.log_method_call
def delete_segment(self, context, uuid, for_net_delete=False):
"""Delete an existing segment."""
segment_dict = self.get_segment(context, uuid)
# Do some preliminary operations before deleting the segment
registry.publish(resources.SEGMENT, events.BEFORE_DELETE,
self.delete_segment,
payload=events.DBEventPayload(
context, metadata={
FOR_NET_DELETE: for_net_delete},
states=(segment_dict,),
resource_id=uuid))
# Delete segment in DB
with db_api.CONTEXT_WRITER.using(context):
if not network.NetworkSegment.delete_objects(context, id=uuid):
raise exceptions.SegmentNotFound(segment_id=uuid)
# Do some preliminary operations before deleting segment in db
registry.notify(resources.SEGMENT, events.PRECOMMIT_DELETE,
self.delete_segment, context=context,
segment=segment_dict,
for_net_delete=for_net_delete)
registry.publish(resources.SEGMENT, events.AFTER_DELETE,
self.delete_segment,
payload=events.DBEventPayload(
context, metadata={
FOR_NET_DELETE: for_net_delete},
states=(segment_dict,),
resource_id=uuid))
@db_api.retry_if_session_inactive()
@lockutils.synchronized('update_segment_host_mapping')
def update_segment_host_mapping(context, host, current_segment_ids):
with db_api.CONTEXT_WRITER.using(context):
segment_host_mapping = network.SegmentHostMapping.get_objects(
context, host=host)
previous_segment_ids = {
seg_host['segment_id'] for seg_host in segment_host_mapping}
for segment_id in current_segment_ids - previous_segment_ids:
network.SegmentHostMapping(
context, segment_id=segment_id, host=host).create()
stale_segment_ids = previous_segment_ids - current_segment_ids
if stale_segment_ids:
for entry in segment_host_mapping:
if entry.segment_id in stale_segment_ids:
entry.delete()
def get_hosts_mapped_with_segments(context):
"""Get hosts that are mapped with segments.
L2 providers can use this method to get an overview of SegmentHostMapping,
and then delete the stale SegmentHostMapping.
"""
segment_host_mapping = network.SegmentHostMapping.get_objects(context)
return {row.host for row in segment_host_mapping}
def _get_phys_nets(agent):
configurations_dict = agent.get('configurations', {})
mappings = configurations_dict.get('bridge_mappings', {})
mappings.update(configurations_dict.get('interface_mappings', {}))
mappings.update(configurations_dict.get('device_mappings', {}))
return list(mappings.keys())
reported_hosts = set()
# NOTE: Module level variable of segments plugin. It should be removed once
# segments becomes a default plugin.
segments_plugin = None
def get_segments_with_phys_nets(context, phys_nets):
"""Get segments from physical networks.
L2 providers usually have information of hostname and physical networks.
They could use this method to get related segments and then update
SegmentHostMapping.
"""
phys_nets = list(phys_nets)
if not phys_nets:
return []
with db_api.CONTEXT_READER.using(context):
return network.NetworkSegment.get_objects(
context, physical_network=phys_nets)
def map_segment_to_hosts(context, segment_id, hosts):
"""Map segment to a collection of hosts."""
with db_api.CONTEXT_WRITER.using(context):
for host in hosts:
network.SegmentHostMapping(
context, segment_id=segment_id, host=host).create()
def _update_segment_host_mapping_for_agent(resource, event, trigger,
payload=None):
plugin = payload.metadata.get('plugin')
agent = payload.desired_state
host = payload.metadata.get('host')
context = payload.context
check_segment_for_agent = getattr(plugin, 'check_segment_for_agent', None)
if (not check_user_configured_segment_plugin() or
not check_segment_for_agent):
return
phys_nets = _get_phys_nets(agent)
if not phys_nets:
return
start_flag = agent.get('start_flag', None)
if host in reported_hosts and not start_flag:
return
reported_hosts.add(host)
if (len(payload.states) > 1 and
payload.states[1] is not None and
agent.get('configurations') == payload.states[1].get(
'configurations')):
return
segments = get_segments_with_phys_nets(context, phys_nets)
current_segment_ids = {
segment['id'] for segment in segments
if check_segment_for_agent(segment, agent)}
update_segment_host_mapping(context, host, current_segment_ids)
registry.publish(resources.SEGMENT_HOST_MAPPING, events.AFTER_CREATE,
plugin, payload=events.DBEventPayload(
context,
metadata={
'host': host,
'current_segment_ids': current_segment_ids}))
def _add_segment_host_mapping_for_segment(resource, event, trigger,
context, segment):
if not context.session.is_active:
# The session might be in partial rollback state, due to errors in
# peer callback. In that case, there is no need to add the mapping.
# Just return here.
return
if not segment.physical_network:
return
cp = directory.get_plugin()
check_segment_for_agent = getattr(cp, 'check_segment_for_agent', None)
if not check_user_configured_segment_plugin() or not hasattr(
cp, 'get_agents') or not check_segment_for_agent:
# not an agent-supporting plugin
registry.unsubscribe(_add_segment_host_mapping_for_segment,
resources.SEGMENT, events.PRECOMMIT_CREATE)
return
hosts = {agent['host'] for agent in cp.get_agents(context)
if check_segment_for_agent(segment, agent)}
map_segment_to_hosts(context, segment.id, hosts)
def _delete_segments_for_network(resource, event, trigger,
context, network_id, **kwargs):
admin_ctx = context.elevated()
global segments_plugin
if not segments_plugin:
segments_plugin = manager.NeutronManager.load_class_for_provider(
'neutron.service_plugins', 'segments')()
segments = segments_plugin.get_segments(
admin_ctx, filters={'network_id': [network_id]})
for segment in segments:
segments_plugin.delete_segment(admin_ctx, segment['id'],
for_net_delete=True)
def subscribe():
registry.subscribe(_update_segment_host_mapping_for_agent,
resources.AGENT,
events.AFTER_CREATE)
registry.subscribe(_update_segment_host_mapping_for_agent,
resources.AGENT,
events.AFTER_UPDATE)
registry.subscribe(_add_segment_host_mapping_for_segment,
resources.SEGMENT, events.PRECOMMIT_CREATE)
registry.subscribe(_delete_segments_for_network,
resources.NETWORK,
events.PRECOMMIT_DELETE)
subscribe()