# Copyright (c) 2013 OpenStack Foundation # 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. import contextlib from eventlet import greenthread from oslo_concurrency import lockutils from oslo_config import cfg from oslo_db import api as oslo_db_api from oslo_db import exception as os_db_exception from oslo_log import log from oslo_serialization import jsonutils from oslo_utils import excutils from oslo_utils import importutils from sqlalchemy import exc as sql_exc from sqlalchemy.orm import exc as sa_exc from neutron.agent import securitygroups_rpc as sg_rpc from neutron.api.rpc.agentnotifiers import dhcp_rpc_agent_api from neutron.api.rpc.handlers import dhcp_rpc from neutron.api.rpc.handlers import dvr_rpc from neutron.api.rpc.handlers import metadata_rpc from neutron.api.rpc.handlers import securitygroups_rpc from neutron.api.v2 import attributes from neutron.callbacks import events from neutron.callbacks import registry from neutron.callbacks import resources from neutron.common import constants as const from neutron.common import exceptions as exc from neutron.common import ipv6_utils from neutron.common import rpc as n_rpc from neutron.common import topics from neutron.common import utils from neutron.db import agents_db from neutron.db import agentschedulers_db from neutron.db import allowedaddresspairs_db as addr_pair_db from neutron.db import api as db_api from neutron.db import db_base_plugin_v2 from neutron.db import dvr_mac_db from neutron.db import external_net_db from neutron.db import extradhcpopt_db from neutron.db import models_v2 from neutron.db import quota_db # noqa from neutron.db import securitygroups_rpc_base as sg_db_rpc from neutron.extensions import allowedaddresspairs as addr_pair from neutron.extensions import extra_dhcp_opt as edo_ext from neutron.extensions import portbindings from neutron.extensions import providernet as provider from neutron.i18n import _LE, _LI, _LW from neutron import manager from neutron.openstack.common import uuidutils from neutron.plugins.common import constants as service_constants from neutron.plugins.ml2.common import exceptions as ml2_exc from neutron.plugins.ml2 import config # noqa from neutron.plugins.ml2 import db from neutron.plugins.ml2 import driver_api as api from neutron.plugins.ml2 import driver_context from neutron.plugins.ml2 import managers from neutron.plugins.ml2 import models from neutron.plugins.ml2 import rpc LOG = log.getLogger(__name__) MAX_BIND_TRIES = 10 # REVISIT(rkukura): Move this and other network_type constants to # providernet.py? TYPE_MULTI_SEGMENT = 'multi-segment' class Ml2Plugin(db_base_plugin_v2.NeutronDbPluginV2, dvr_mac_db.DVRDbMixin, external_net_db.External_net_db_mixin, sg_db_rpc.SecurityGroupServerRpcMixin, agentschedulers_db.DhcpAgentSchedulerDbMixin, addr_pair_db.AllowedAddressPairsMixin, extradhcpopt_db.ExtraDhcpOptMixin): """Implement the Neutron L2 abstractions using modules. Ml2Plugin is a Neutron plugin based on separately extensible sets of network types and mechanisms for connecting to networks of those types. The network types and mechanisms are implemented as drivers loaded via Python entry points. Networks can be made up of multiple segments (not yet fully implemented). """ # This attribute specifies whether the plugin supports or not # bulk/pagination/sorting operations. Name mangling is used in # order to ensure it is qualified by class __native_bulk_support = True __native_pagination_support = True __native_sorting_support = True # List of supported extensions _supported_extension_aliases = ["provider", "external-net", "binding", "quotas", "security-group", "agent", "dhcp_agent_scheduler", "multi-provider", "allowed-address-pairs", "extra_dhcp_opt"] @property def supported_extension_aliases(self): if not hasattr(self, '_aliases'): aliases = self._supported_extension_aliases[:] aliases += self.extension_manager.extension_aliases() sg_rpc.disable_security_group_extension_by_config(aliases) self._aliases = aliases return self._aliases def __init__(self): # First load drivers, then initialize DB, then initialize drivers self.type_manager = managers.TypeManager() self.extension_manager = managers.ExtensionManager() self.mechanism_manager = managers.MechanismManager() super(Ml2Plugin, self).__init__() self.type_manager.initialize() self.extension_manager.initialize() self.mechanism_manager.initialize() self._setup_rpc() # REVISIT(rkukura): Use stevedore for these? self.network_scheduler = importutils.import_object( cfg.CONF.network_scheduler_driver ) self.start_periodic_dhcp_agent_status_check() LOG.info(_LI("Modular L2 Plugin initialization complete")) def _setup_rpc(self): self.notifier = rpc.AgentNotifierApi(topics.AGENT) self.agent_notifiers[const.AGENT_TYPE_DHCP] = ( dhcp_rpc_agent_api.DhcpAgentNotifyAPI() ) def start_rpc_listeners(self): self.endpoints = [rpc.RpcCallbacks(self.notifier, self.type_manager), securitygroups_rpc.SecurityGroupServerRpcCallback(), dvr_rpc.DVRServerRpcCallback(), dhcp_rpc.DhcpRpcCallback(), agents_db.AgentExtRpcCallback(), metadata_rpc.MetadataRpcCallback()] self.topic = topics.PLUGIN self.conn = n_rpc.create_connection(new=True) self.conn.create_consumer(self.topic, self.endpoints, fanout=False) return self.conn.consume_in_threads() def _filter_nets_provider(self, context, networks, filters): return [network for network in networks if self.type_manager.network_matches_filters(network, filters) ] def _get_host_port_if_changed(self, mech_context, attrs): binding = mech_context._binding host = attrs and attrs.get(portbindings.HOST_ID) if (attributes.is_attr_set(host) and binding.host != host): return mech_context.current def _check_mac_update_allowed(self, orig_port, port, binding): unplugged_types = (portbindings.VIF_TYPE_BINDING_FAILED, portbindings.VIF_TYPE_UNBOUND) new_mac = port.get('mac_address') mac_change = (new_mac is not None and orig_port['mac_address'] != new_mac) if (mac_change and binding.vif_type not in unplugged_types): raise exc.PortBound(port_id=orig_port['id'], vif_type=binding.vif_type, old_mac=orig_port['mac_address'], new_mac=port['mac_address']) return mac_change def _process_port_binding(self, mech_context, attrs): session = mech_context._plugin_context.session binding = mech_context._binding port = mech_context.current port_id = port['id'] changes = False host = attrs and attrs.get(portbindings.HOST_ID) original_host = binding.host if (attributes.is_attr_set(host) and original_host != host): binding.host = host changes = True vnic_type = attrs and attrs.get(portbindings.VNIC_TYPE) if (attributes.is_attr_set(vnic_type) and binding.vnic_type != vnic_type): binding.vnic_type = vnic_type changes = True # treat None as clear of profile. profile = None if attrs and portbindings.PROFILE in attrs: profile = attrs.get(portbindings.PROFILE) or {} if profile not in (None, attributes.ATTR_NOT_SPECIFIED, self._get_profile(binding)): binding.profile = jsonutils.dumps(profile) if len(binding.profile) > models.BINDING_PROFILE_LEN: msg = _("binding:profile value too large") raise exc.InvalidInput(error_message=msg) changes = True # Unbind the port if needed. if changes: binding.vif_type = portbindings.VIF_TYPE_UNBOUND binding.vif_details = '' db.clear_binding_levels(session, port_id, original_host) mech_context._clear_binding_levels() if port['device_owner'] == const.DEVICE_OWNER_DVR_INTERFACE: binding.vif_type = portbindings.VIF_TYPE_DISTRIBUTED binding.vif_details = '' db.clear_binding_levels(session, port_id, original_host) mech_context._clear_binding_levels() binding.host = '' self._update_port_dict_binding(port, binding) return changes def _bind_port_if_needed(self, context, allow_notify=False, need_notify=False): plugin_context = context._plugin_context port_id = context._port['id'] # Since the mechanism driver bind_port() calls must be made # outside a DB transaction locking the port state, it is # possible (but unlikely) that the port's state could change # concurrently while these calls are being made. If another # thread or process succeeds in binding the port before this # thread commits its results, the already committed results are # used. If attributes such as binding:host_id, # binding:profile, or binding:vnic_type are updated # concurrently, this loop retries binding using the new # values. count = 0 while True: # First, determine whether it is necessary and possible to # bind the port. binding = context._binding if (binding.vif_type != portbindings.VIF_TYPE_UNBOUND or not binding.host): # We either don't need to bind the port, or can't, so # notify if needed and return. if allow_notify and need_notify: self._notify_port_updated(context) return context # Limit binding attempts to avoid any possibility of # infinite looping and to ensure an error is logged # instead. This does not need to be tunable because no # more than a couple attempts should ever be required in # normal operation. Log at info level if not 1st attempt. count += 1 if count > MAX_BIND_TRIES: LOG.error(_LE("Failed to commit binding results for %(port)s " "after %(max)s tries"), {'port': port_id, 'max': MAX_BIND_TRIES}) return context if count > 1: greenthread.sleep(0) # yield LOG.info(_LI("Attempt %(count)s to bind port %(port)s"), {'count': count, 'port': port_id}) # The port isn't already bound and the necessary # information is available, so attempt to bind the port. bind_context = self._bind_port(context) # Now try to commit result of attempting to bind the port. new_context, did_commit = self._commit_port_binding( plugin_context, port_id, binding, bind_context) if not new_context: # The port has been deleted concurrently, so just # return the unbound result from the initial # transaction that completed before the deletion. LOG.debug("Port %s has been deleted concurrently", port_id) return context # Need to notify if we succeed and our results were # committed. if did_commit and (new_context._binding.vif_type != portbindings.VIF_TYPE_BINDING_FAILED): need_notify = True context = new_context def _bind_port(self, orig_context): # Construct a new PortContext from the one from the previous # transaction. port = orig_context._port orig_binding = orig_context._binding new_binding = models.PortBinding( host=orig_binding.host, vnic_type=orig_binding.vnic_type, profile=orig_binding.profile, vif_type=portbindings.VIF_TYPE_UNBOUND, vif_details='' ) self._update_port_dict_binding(port, new_binding) new_context = driver_context.PortContext( self, orig_context._plugin_context, port, orig_context._network_context._network, new_binding, None) # Attempt to bind the port and return the context with the # result. self.mechanism_manager.bind_port(new_context) return new_context def _commit_port_binding(self, plugin_context, port_id, orig_binding, new_context): session = plugin_context.session new_binding = new_context._binding # After we've attempted to bind the port, we begin a # transaction, get the current port state, and decide whether # to commit the binding results. # # REVISIT: Serialize this operation with a semaphore to # prevent deadlock waiting to acquire a DB lock held by # another thread in the same process, leading to 'lock wait # timeout' errors. with contextlib.nested(lockutils.lock('db-access'), session.begin(subtransactions=True)): # Get the current port state and build a new PortContext # reflecting this state as original state for subsequent # mechanism driver update_port_*commit() calls. port_db, cur_binding = db.get_locked_port_and_binding(session, port_id) if not port_db: # The port has been deleted concurrently. return (None, None) oport = self._make_port_dict(port_db) port = self._make_port_dict(port_db) network = new_context.network.current if port['device_owner'] == const.DEVICE_OWNER_DVR_INTERFACE: # REVISIT(rkukura): The PortBinding instance from the # ml2_port_bindings table, returned as cur_binding # from db.get_locked_port_and_binding() above, is # currently not used for DVR distributed ports, and is # replaced here with the DVRPortBinding instance from # the ml2_dvr_port_bindings table specific to the host # on which the distributed port is being bound. It # would be possible to optimize this code to avoid # fetching the PortBinding instance in the DVR case, # and even to avoid creating the unused entry in the # ml2_port_bindings table. But the upcoming resolution # for bug 1367391 will eliminate the # ml2_dvr_port_bindings table, use the # ml2_port_bindings table to store non-host-specific # fields for both distributed and non-distributed # ports, and introduce a new ml2_port_binding_hosts # table for the fields that need to be host-specific # in the distributed case. Since the PortBinding # instance will then be needed, it does not make sense # to optimize this code to avoid fetching it. cur_binding = db.get_dvr_port_binding_by_host( session, port_id, orig_binding.host) cur_context = driver_context.PortContext( self, plugin_context, port, network, cur_binding, None, original_port=oport) # Commit our binding results only if port has not been # successfully bound concurrently by another thread or # process and no binding inputs have been changed. commit = ((cur_binding.vif_type in [portbindings.VIF_TYPE_UNBOUND, portbindings.VIF_TYPE_BINDING_FAILED]) and orig_binding.host == cur_binding.host and orig_binding.vnic_type == cur_binding.vnic_type and orig_binding.profile == cur_binding.profile) if commit: # Update the port's binding state with our binding # results. cur_binding.vif_type = new_binding.vif_type cur_binding.vif_details = new_binding.vif_details db.clear_binding_levels(session, port_id, cur_binding.host) db.set_binding_levels(session, new_context._binding_levels) cur_context._binding_levels = new_context._binding_levels # Update PortContext's port dictionary to reflect the # updated binding state. self._update_port_dict_binding(port, cur_binding) # Update the port status if requested by the bound driver. if (new_context._binding_levels and new_context._new_port_status): port_db.status = new_context._new_port_status port['status'] = new_context._new_port_status # Call the mechanism driver precommit methods, commit # the results, and call the postcommit methods. self.mechanism_manager.update_port_precommit(cur_context) if commit: self.mechanism_manager.update_port_postcommit(cur_context) # Continue, using the port state as of the transaction that # just finished, whether that transaction committed new # results or discovered concurrent port state changes. return (cur_context, commit) def _update_port_dict_binding(self, port, binding): port[portbindings.HOST_ID] = binding.host port[portbindings.VNIC_TYPE] = binding.vnic_type port[portbindings.PROFILE] = self._get_profile(binding) port[portbindings.VIF_TYPE] = binding.vif_type port[portbindings.VIF_DETAILS] = self._get_vif_details(binding) def _get_vif_details(self, binding): if binding.vif_details: try: return jsonutils.loads(binding.vif_details) except Exception: LOG.error(_LE("Serialized vif_details DB value '%(value)s' " "for port %(port)s is invalid"), {'value': binding.vif_details, 'port': binding.port_id}) return {} def _get_profile(self, binding): if binding.profile: try: return jsonutils.loads(binding.profile) except Exception: LOG.error(_LE("Serialized profile DB value '%(value)s' for " "port %(port)s is invalid"), {'value': binding.profile, 'port': binding.port_id}) return {} def _ml2_extend_port_dict_binding(self, port_res, port_db): # None when called during unit tests for other plugins. if port_db.port_binding: self._update_port_dict_binding(port_res, port_db.port_binding) db_base_plugin_v2.NeutronDbPluginV2.register_dict_extend_funcs( attributes.PORTS, ['_ml2_extend_port_dict_binding']) # Register extend dict methods for network and port resources. # Each mechanism driver that supports extend attribute for the resources # can add those attribute to the result. db_base_plugin_v2.NeutronDbPluginV2.register_dict_extend_funcs( attributes.NETWORKS, ['_ml2_md_extend_network_dict']) db_base_plugin_v2.NeutronDbPluginV2.register_dict_extend_funcs( attributes.PORTS, ['_ml2_md_extend_port_dict']) db_base_plugin_v2.NeutronDbPluginV2.register_dict_extend_funcs( attributes.SUBNETS, ['_ml2_md_extend_subnet_dict']) def _ml2_md_extend_network_dict(self, result, netdb): session = db_api.get_session() with session.begin(subtransactions=True): self.extension_manager.extend_network_dict(session, netdb, result) def _ml2_md_extend_port_dict(self, result, portdb): session = db_api.get_session() with session.begin(subtransactions=True): self.extension_manager.extend_port_dict(session, portdb, result) def _ml2_md_extend_subnet_dict(self, result, subnetdb): session = db_api.get_session() with session.begin(subtransactions=True): self.extension_manager.extend_subnet_dict( session, subnetdb, result) # Note - The following hook methods have "ml2" in their names so # that they are not called twice during unit tests due to global # registration of hooks in portbindings_db.py used by other # plugins. def _ml2_port_model_hook(self, context, original_model, query): query = query.outerjoin(models.PortBinding, (original_model.id == models.PortBinding.port_id)) return query def _ml2_port_result_filter_hook(self, query, filters): values = filters and filters.get(portbindings.HOST_ID, []) if not values: return query return query.filter(models.PortBinding.host.in_(values)) db_base_plugin_v2.NeutronDbPluginV2.register_model_query_hook( models_v2.Port, "ml2_port_bindings", '_ml2_port_model_hook', None, '_ml2_port_result_filter_hook') def _notify_port_updated(self, mech_context): port = mech_context._port segment = mech_context.bottom_bound_segment if not segment: # REVISIT(rkukura): This should notify agent to unplug port network = mech_context.network.current LOG.warning(_LW("In _notify_port_updated(), no bound segment for " "port %(port_id)s on network %(network_id)s"), {'port_id': port['id'], 'network_id': network['id']}) return self.notifier.port_update(mech_context._plugin_context, port, segment[api.NETWORK_TYPE], segment[api.SEGMENTATION_ID], segment[api.PHYSICAL_NETWORK]) def _delete_objects(self, context, resource, objects): delete_op = getattr(self, 'delete_%s' % resource) for obj in objects: try: delete_op(context, obj['result']['id']) except KeyError: LOG.exception(_LE("Could not find %s to delete."), resource) except Exception: LOG.exception(_LE("Could not delete %(res)s %(id)s."), {'res': resource, 'id': obj['result']['id']}) def _create_bulk_ml2(self, resource, context, request_items): objects = [] collection = "%ss" % resource items = request_items[collection] try: with context.session.begin(subtransactions=True): obj_creator = getattr(self, '_create_%s_db' % resource) for item in items: attrs = item[resource] result, mech_context = obj_creator(context, item) objects.append({'mech_context': mech_context, 'result': result, 'attributes': attrs}) except Exception: with excutils.save_and_reraise_exception(): LOG.exception(_LE("An exception occurred while creating " "the %(resource)s:%(item)s"), {'resource': resource, 'item': item}) try: postcommit_op = getattr(self.mechanism_manager, 'create_%s_postcommit' % resource) for obj in objects: postcommit_op(obj['mech_context']) return objects except ml2_exc.MechanismDriverError: with excutils.save_and_reraise_exception(): resource_ids = [res['result']['id'] for res in objects] LOG.exception(_LE("mechanism_manager.create_%(res)s" "_postcommit failed for %(res)s: " "'%(failed_id)s'. Deleting " "%(res)ss %(resource_ids)s"), {'res': resource, 'failed_id': obj['result']['id'], 'resource_ids': ', '.join(resource_ids)}) self._delete_objects(context, resource, objects) def _create_network_db(self, context, network): net_data = network[attributes.NETWORK] tenant_id = self._get_tenant_id_for_create(context, net_data) session = context.session with session.begin(subtransactions=True): self._ensure_default_security_group(context, tenant_id) result = super(Ml2Plugin, self).create_network(context, network) self.extension_manager.process_create_network(context, net_data, result) self._process_l3_create(context, result, net_data) net_data['id'] = result['id'] self.type_manager.create_network_segments(context, net_data, tenant_id) self.type_manager.extend_network_dict_provider(context, result) mech_context = driver_context.NetworkContext(self, context, result) self.mechanism_manager.create_network_precommit(mech_context) return result, mech_context @oslo_db_api.wrap_db_retry(max_retries=db_api.MAX_RETRIES, retry_on_request=True) def _create_network_with_retries(self, context, network): return self._create_network_db(context, network) def create_network(self, context, network): result, mech_context = self._create_network_with_retries(context, network) try: self.mechanism_manager.create_network_postcommit(mech_context) except ml2_exc.MechanismDriverError: with excutils.save_and_reraise_exception(): LOG.error(_LE("mechanism_manager.create_network_postcommit " "failed, deleting network '%s'"), result['id']) self.delete_network(context, result['id']) return result def create_network_bulk(self, context, networks): objects = self._create_bulk_ml2(attributes.NETWORK, context, networks) return [obj['result'] for obj in objects] def update_network(self, context, id, network): net_data = network[attributes.NETWORK] provider._raise_if_updates_provider_attributes(net_data) session = context.session with session.begin(subtransactions=True): original_network = super(Ml2Plugin, self).get_network(context, id) updated_network = super(Ml2Plugin, self).update_network(context, id, network) self.extension_manager.process_update_network(context, net_data, updated_network) self._process_l3_update(context, updated_network, net_data) self.type_manager.extend_network_dict_provider(context, updated_network) mech_context = driver_context.NetworkContext( self, context, updated_network, original_network=original_network) self.mechanism_manager.update_network_precommit(mech_context) # TODO(apech) - handle errors raised by update_network, potentially # by re-calling update_network with the previous attributes. For # now the error is propogated to the caller, which is expected to # either undo/retry the operation or delete the resource. self.mechanism_manager.update_network_postcommit(mech_context) return updated_network def get_network(self, context, id, fields=None): session = context.session with session.begin(subtransactions=True): result = super(Ml2Plugin, self).get_network(context, id, None) self.type_manager.extend_network_dict_provider(context, result) return self._fields(result, fields) def get_networks(self, context, filters=None, fields=None, sorts=None, limit=None, marker=None, page_reverse=False): session = context.session with session.begin(subtransactions=True): nets = super(Ml2Plugin, self).get_networks(context, filters, None, sorts, limit, marker, page_reverse) for net in nets: self.type_manager.extend_network_dict_provider(context, net) nets = self._filter_nets_provider(context, nets, filters) nets = self._filter_nets_l3(context, nets, filters) return [self._fields(net, fields) for net in nets] def _delete_ports(self, context, ports): for port in ports: try: self.delete_port(context, port.id) except exc.PortNotFound: # concurrent port deletion can be performed by # release_dhcp_port caused by concurrent subnet_delete LOG.info(_LI("Port %s was deleted concurrently"), port.id) except Exception: with excutils.save_and_reraise_exception(): LOG.exception(_LE("Exception auto-deleting port %s"), port.id) def _delete_subnets(self, context, subnets): for subnet in subnets: try: self.delete_subnet(context, subnet.id) except exc.SubnetNotFound: LOG.info(_LI("Subnet %s was deleted concurrently"), subnet.id) except Exception: with excutils.save_and_reraise_exception(): LOG.exception(_LE("Exception auto-deleting subnet %s"), subnet.id) def delete_network(self, context, id): # REVISIT(rkukura) The super(Ml2Plugin, self).delete_network() # function is not used because it auto-deletes ports and # subnets from the DB without invoking the derived class's # delete_port() or delete_subnet(), preventing mechanism # drivers from being called. This approach should be revisited # when the API layer is reworked during icehouse. LOG.debug("Deleting network %s", id) session = context.session while True: try: # REVISIT: Serialize this operation with a semaphore # to prevent deadlock waiting to acquire a DB lock # held by another thread in the same process, leading # to 'lock wait timeout' errors. # # Process L3 first, since, depending on the L3 plugin, it may # involve locking the db-access semaphore, sending RPC # notifications, and/or calling delete_port on this plugin. # Additionally, a rollback may not be enough to undo the # deletion of a floating IP with certain L3 backends. self._process_l3_delete(context, id) # Using query().with_lockmode isn't necessary. Foreign-key # constraints prevent deletion if concurrent creation happens. with contextlib.nested(lockutils.lock('db-access'), session.begin(subtransactions=True)): # Get ports to auto-delete. ports = (session.query(models_v2.Port). enable_eagerloads(False). filter_by(network_id=id).all()) LOG.debug("Ports to auto-delete: %s", ports) only_auto_del = all(p.device_owner in db_base_plugin_v2. AUTO_DELETE_PORT_OWNERS for p in ports) if not only_auto_del: LOG.debug("Tenant-owned ports exist") raise exc.NetworkInUse(net_id=id) # Get subnets to auto-delete. subnets = (session.query(models_v2.Subnet). enable_eagerloads(False). filter_by(network_id=id).all()) LOG.debug("Subnets to auto-delete: %s", subnets) if not (ports or subnets): network = self.get_network(context, id) mech_context = driver_context.NetworkContext(self, context, network) self.mechanism_manager.delete_network_precommit( mech_context) self.type_manager.release_network_segments(session, id) record = self._get_network(context, id) LOG.debug("Deleting network record %s", record) session.delete(record) # The segment records are deleted via cascade from the # network record, so explicit removal is not necessary. LOG.debug("Committing transaction") break except os_db_exception.DBError as e: with excutils.save_and_reraise_exception() as ctxt: if isinstance(e.inner_exception, sql_exc.IntegrityError): ctxt.reraise = False LOG.warning(_LW("A concurrent port creation has " "occurred")) continue self._delete_ports(context, ports) self._delete_subnets(context, subnets) try: self.mechanism_manager.delete_network_postcommit(mech_context) except ml2_exc.MechanismDriverError: # TODO(apech) - One or more mechanism driver failed to # delete the network. Ideally we'd notify the caller of # the fact that an error occurred. LOG.error(_LE("mechanism_manager.delete_network_postcommit" " failed")) self.notifier.network_delete(context, id) def _create_subnet_db(self, context, subnet): session = context.session with session.begin(subtransactions=True): result = super(Ml2Plugin, self).create_subnet(context, subnet) self.extension_manager.process_create_subnet( context, subnet[attributes.SUBNET], result) mech_context = driver_context.SubnetContext(self, context, result) self.mechanism_manager.create_subnet_precommit(mech_context) return result, mech_context def create_subnet(self, context, subnet): result, mech_context = self._create_subnet_db(context, subnet) try: self.mechanism_manager.create_subnet_postcommit(mech_context) except ml2_exc.MechanismDriverError: with excutils.save_and_reraise_exception(): LOG.error(_LE("mechanism_manager.create_subnet_postcommit " "failed, deleting subnet '%s'"), result['id']) self.delete_subnet(context, result['id']) return result def create_subnet_bulk(self, context, subnets): objects = self._create_bulk_ml2(attributes.SUBNET, context, subnets) return [obj['result'] for obj in objects] def update_subnet(self, context, id, subnet): session = context.session with session.begin(subtransactions=True): original_subnet = super(Ml2Plugin, self).get_subnet(context, id) updated_subnet = super(Ml2Plugin, self).update_subnet( context, id, subnet) self.extension_manager.process_update_subnet( context, subnet[attributes.SUBNET], updated_subnet) mech_context = driver_context.SubnetContext( self, context, updated_subnet, original_subnet=original_subnet) self.mechanism_manager.update_subnet_precommit(mech_context) # TODO(apech) - handle errors raised by update_subnet, potentially # by re-calling update_subnet with the previous attributes. For # now the error is propogated to the caller, which is expected to # either undo/retry the operation or delete the resource. self.mechanism_manager.update_subnet_postcommit(mech_context) return updated_subnet def delete_subnet(self, context, id): # REVISIT(rkukura) The super(Ml2Plugin, self).delete_subnet() # function is not used because it deallocates the subnet's addresses # from ports in the DB without invoking the derived class's # update_port(), preventing mechanism drivers from being called. # This approach should be revisited when the API layer is reworked # during icehouse. LOG.debug("Deleting subnet %s", id) session = context.session while True: # REVISIT: Serialize this operation with a semaphore to # prevent deadlock waiting to acquire a DB lock held by # another thread in the same process, leading to 'lock # wait timeout' errors. with contextlib.nested(lockutils.lock('db-access'), session.begin(subtransactions=True)): record = self._get_subnet(context, id) subnet = self._make_subnet_dict(record, None) qry_allocated = (session.query(models_v2.IPAllocation). filter_by(subnet_id=id). join(models_v2.Port)) is_auto_addr_subnet = ipv6_utils.is_auto_address_subnet(subnet) # Remove network owned ports, and delete IP allocations # for IPv6 addresses which were automatically generated # via SLAAC if is_auto_addr_subnet: self._subnet_check_ip_allocations_internal_router_ports( context, id) else: qry_allocated = ( qry_allocated.filter(models_v2.Port.device_owner. in_(db_base_plugin_v2.AUTO_DELETE_PORT_OWNERS))) allocated = qry_allocated.all() # Delete all the IPAllocation that can be auto-deleted if allocated: map(session.delete, allocated) LOG.debug("Ports to auto-deallocate: %s", allocated) # Check if there are more IP allocations, unless # is_auto_address_subnet is True. In that case the check is # unnecessary. This additional check not only would be wasteful # for this class of subnet, but is also error-prone since when # the isolation level is set to READ COMMITTED allocations made # concurrently will be returned by this query if not is_auto_addr_subnet: if self._subnet_check_ip_allocations(context, id): LOG.debug("Found IP allocations on subnet %s, " "cannot delete", id) raise exc.SubnetInUse(subnet_id=id) # If allocated is None, then all the IPAllocation were # correctly deleted during the previous pass. if not allocated: mech_context = driver_context.SubnetContext(self, context, subnet) self.mechanism_manager.delete_subnet_precommit( mech_context) LOG.debug("Deleting subnet record") session.delete(record) LOG.debug("Committing transaction") break for a in allocated: if a.port_id: # calling update_port() for each allocation to remove the # IP from the port and call the MechanismDrivers data = {attributes.PORT: {'fixed_ips': [{'subnet_id': ip.subnet_id, 'ip_address': ip.ip_address} for ip in a.ports.fixed_ips if ip.subnet_id != id]}} try: self.update_port(context, a.port_id, data) except Exception: with excutils.save_and_reraise_exception(): LOG.exception(_LE("Exception deleting fixed_ip " "from port %s"), a.port_id) try: self.mechanism_manager.delete_subnet_postcommit(mech_context) except ml2_exc.MechanismDriverError: # TODO(apech) - One or more mechanism driver failed to # delete the subnet. Ideally we'd notify the caller of # the fact that an error occurred. LOG.error(_LE("mechanism_manager.delete_subnet_postcommit failed")) def _create_port_db(self, context, port): attrs = port[attributes.PORT] attrs['status'] = const.PORT_STATUS_DOWN session = context.session with session.begin(subtransactions=True): self._ensure_default_security_group_on_port(context, port) sgids = self._get_security_groups_on_port(context, port) dhcp_opts = attrs.get(edo_ext.EXTRADHCPOPTS, []) result = super(Ml2Plugin, self).create_port(context, port) self.extension_manager.process_create_port(context, attrs, result) self._process_port_create_security_group(context, result, sgids) network = self.get_network(context, result['network_id']) binding = db.add_port_binding(session, result['id']) mech_context = driver_context.PortContext(self, context, result, network, binding, None) self._process_port_binding(mech_context, attrs) result[addr_pair.ADDRESS_PAIRS] = ( self._process_create_allowed_address_pairs( context, result, attrs.get(addr_pair.ADDRESS_PAIRS))) self._process_port_create_extra_dhcp_opts(context, result, dhcp_opts) self.mechanism_manager.create_port_precommit(mech_context) return result, mech_context def create_port(self, context, port): attrs = port[attributes.PORT] result, mech_context = self._create_port_db(context, port) new_host_port = self._get_host_port_if_changed(mech_context, attrs) # notify any plugin that is interested in port create events kwargs = {'context': context, 'port': new_host_port} registry.notify(resources.PORT, events.AFTER_CREATE, self, **kwargs) try: self.mechanism_manager.create_port_postcommit(mech_context) except ml2_exc.MechanismDriverError: with excutils.save_and_reraise_exception(): LOG.error(_LE("mechanism_manager.create_port_postcommit " "failed, deleting port '%s'"), result['id']) self.delete_port(context, result['id']) # REVISIT(rkukura): Is there any point in calling this before # a binding has been successfully established? self.notify_security_groups_member_updated(context, result) try: bound_context = self._bind_port_if_needed(mech_context) except ml2_exc.MechanismDriverError: with excutils.save_and_reraise_exception(): LOG.error(_LE("_bind_port_if_needed " "failed, deleting port '%s'"), result['id']) self.delete_port(context, result['id']) return bound_context._port def create_port_bulk(self, context, ports): objects = self._create_bulk_ml2(attributes.PORT, context, ports) # REVISIT(rkukura): Is there any point in calling this before # a binding has been successfully established? results = [obj['result'] for obj in objects] self.notify_security_groups_member_updated_bulk(context, results) for obj in objects: attrs = obj['attributes'] if attrs and attrs.get(portbindings.HOST_ID): new_host_port = self._get_host_port_if_changed( obj['mech_context'], attrs) kwargs = {'context': context, 'port': new_host_port} registry.notify( resources.PORT, events.AFTER_CREATE, self, **kwargs) try: for obj in objects: obj['bound_context'] = self._bind_port_if_needed( obj['mech_context']) return [obj['bound_context']._port for obj in objects] except ml2_exc.MechanismDriverError: with excutils.save_and_reraise_exception(): resource_ids = [res['result']['id'] for res in objects] LOG.error(_LE("_bind_port_if_needed failed. " "Deleting all ports from create bulk '%s'"), resource_ids) self._delete_objects(context, attributes.PORT, objects) def update_port(self, context, id, port): attrs = port[attributes.PORT] need_port_update_notify = False session = context.session # REVISIT: Serialize this operation with a semaphore to # prevent deadlock waiting to acquire a DB lock held by # another thread in the same process, leading to 'lock wait # timeout' errors. with contextlib.nested(lockutils.lock('db-access'), session.begin(subtransactions=True)): port_db, binding = db.get_locked_port_and_binding(session, id) if not port_db: raise exc.PortNotFound(port_id=id) mac_address_updated = self._check_mac_update_allowed( port_db, port, binding) need_port_update_notify |= mac_address_updated original_port = self._make_port_dict(port_db) updated_port = super(Ml2Plugin, self).update_port(context, id, port) self.extension_manager.process_update_port(context, attrs, updated_port) if addr_pair.ADDRESS_PAIRS in attrs: need_port_update_notify |= ( self.update_address_pairs_on_port(context, id, port, original_port, updated_port)) need_port_update_notify |= self.update_security_group_on_port( context, id, port, original_port, updated_port) network = self.get_network(context, original_port['network_id']) need_port_update_notify |= self._update_extra_dhcp_opts_on_port( context, id, port, updated_port) levels = db.get_binding_levels(session, id, binding.host) mech_context = driver_context.PortContext( self, context, updated_port, network, binding, levels, original_port=original_port) new_host_port = self._get_host_port_if_changed(mech_context, attrs) need_port_update_notify |= self._process_port_binding( mech_context, attrs) self.mechanism_manager.update_port_precommit(mech_context) # Notifications must be sent after the above transaction is complete kwargs = { 'context': context, 'port': new_host_port, 'mac_address_updated': mac_address_updated, } registry.notify(resources.PORT, events.AFTER_UPDATE, self, **kwargs) # TODO(apech) - handle errors raised by update_port, potentially # by re-calling update_port with the previous attributes. For # now the error is propogated to the caller, which is expected to # either undo/retry the operation or delete the resource. self.mechanism_manager.update_port_postcommit(mech_context) need_port_update_notify |= self.is_security_group_member_updated( context, original_port, updated_port) if original_port['admin_state_up'] != updated_port['admin_state_up']: need_port_update_notify = True bound_context = self._bind_port_if_needed( mech_context, allow_notify=True, need_notify=need_port_update_notify) return bound_context._port def _process_dvr_port_binding(self, mech_context, context, attrs): session = mech_context._plugin_context.session binding = mech_context._binding port = mech_context.current port_id = port['id'] if binding.vif_type != portbindings.VIF_TYPE_UNBOUND: binding.vif_details = '' binding.vif_type = portbindings.VIF_TYPE_UNBOUND if binding.host: db.clear_binding_levels(session, port_id, binding.host) binding.host = '' self._update_port_dict_binding(port, binding) binding.host = attrs and attrs.get(portbindings.HOST_ID) binding.router_id = attrs and attrs.get('device_id') def update_dvr_port_binding(self, context, id, port): attrs = port[attributes.PORT] host = attrs and attrs.get(portbindings.HOST_ID) host_set = attributes.is_attr_set(host) if not host_set: LOG.error(_LE("No Host supplied to bind DVR Port %s"), id) return session = context.session binding = db.get_dvr_port_binding_by_host(session, id, host) device_id = attrs and attrs.get('device_id') router_id = binding and binding.get('router_id') update_required = (not binding or binding.vif_type == portbindings.VIF_TYPE_BINDING_FAILED or router_id != device_id) if update_required: with session.begin(subtransactions=True): try: orig_port = super(Ml2Plugin, self).get_port(context, id) except exc.PortNotFound: LOG.debug("DVR Port %s has been deleted concurrently", id) return if not binding: binding = db.ensure_dvr_port_binding( session, id, host, router_id=device_id) network = self.get_network(context, orig_port['network_id']) levels = db.get_binding_levels(session, id, host) mech_context = driver_context.PortContext(self, context, orig_port, network, binding, levels, original_port=orig_port) self._process_dvr_port_binding(mech_context, context, attrs) self._bind_port_if_needed(mech_context) def delete_port(self, context, id, l3_port_check=True): LOG.debug("Deleting port %s", id) removed_routers = [] l3plugin = manager.NeutronManager.get_service_plugins().get( service_constants.L3_ROUTER_NAT) is_dvr_enabled = utils.is_extension_supported( l3plugin, const.L3_DISTRIBUTED_EXT_ALIAS) if l3plugin and l3_port_check: l3plugin.prevent_l3_port_deletion(context, id) session = context.session # REVISIT: Serialize this operation with a semaphore to # prevent deadlock waiting to acquire a DB lock held by # another thread in the same process, leading to 'lock wait # timeout' errors. with contextlib.nested(lockutils.lock('db-access'), session.begin(subtransactions=True)): port_db, binding = db.get_locked_port_and_binding(session, id) if not port_db: LOG.debug("The port '%s' was deleted", id) return port = self._make_port_dict(port_db) network = self.get_network(context, port['network_id']) bound_mech_contexts = [] device_owner = port['device_owner'] if device_owner == const.DEVICE_OWNER_DVR_INTERFACE: bindings = db.get_dvr_port_bindings(context.session, id) for bind in bindings: levels = db.get_binding_levels(context.session, id, bind.host) mech_context = driver_context.PortContext( self, context, port, network, bind, levels) self.mechanism_manager.delete_port_precommit(mech_context) bound_mech_contexts.append(mech_context) else: levels = db.get_binding_levels(context.session, id, binding.host) mech_context = driver_context.PortContext( self, context, port, network, binding, levels) if is_dvr_enabled and utils.is_dvr_serviced(device_owner): removed_routers = l3plugin.dvr_deletens_if_no_port( context, id) self.mechanism_manager.delete_port_precommit(mech_context) bound_mech_contexts.append(mech_context) if l3plugin: router_ids = l3plugin.disassociate_floatingips( context, id, do_notify=False) LOG.debug("Calling delete_port for %(port_id)s owned by %(owner)s", {"port_id": id, "owner": device_owner}) super(Ml2Plugin, self).delete_port(context, id) # now that we've left db transaction, we are safe to notify if l3plugin: if is_dvr_enabled: l3plugin.dvr_vmarp_table_update(context, port, "del") l3plugin.notify_routers_updated(context, router_ids) for router in removed_routers: l3plugin.remove_router_from_l3_agent( context, router['agent_id'], router['router_id']) try: # Note that DVR Interface ports will have bindings on # multiple hosts, and so will have multiple mech_contexts, # while other ports typically have just one. for mech_context in bound_mech_contexts: self.mechanism_manager.delete_port_postcommit(mech_context) except ml2_exc.MechanismDriverError: # TODO(apech) - One or more mechanism driver failed to # delete the port. Ideally we'd notify the caller of the # fact that an error occurred. LOG.error(_LE("mechanism_manager.delete_port_postcommit failed for" " port %s"), id) self.notifier.port_delete(context, id) self.notify_security_groups_member_updated(context, port) def get_bound_port_context(self, plugin_context, port_id, host=None): session = plugin_context.session with session.begin(subtransactions=True): try: port_db = (session.query(models_v2.Port). enable_eagerloads(False). filter(models_v2.Port.id.startswith(port_id)). one()) except sa_exc.NoResultFound: LOG.debug("No ports have port_id starting with %s", port_id) return except sa_exc.MultipleResultsFound: LOG.error(_LE("Multiple ports have port_id starting with %s"), port_id) return port = self._make_port_dict(port_db) network = self.get_network(plugin_context, port['network_id']) if port['device_owner'] == const.DEVICE_OWNER_DVR_INTERFACE: binding = db.get_dvr_port_binding_by_host( session, port['id'], host) if not binding: LOG.error(_LE("Binding info for DVR port %s not found"), port_id) return None levels = db.get_binding_levels(session, port_db.id, host) port_context = driver_context.PortContext( self, plugin_context, port, network, binding, levels) else: # since eager loads are disabled in port_db query # related attribute port_binding could disappear in # concurrent port deletion. # It's not an error condition. binding = port_db.port_binding if not binding: LOG.info(_LI("Binding info for port %s was not found, " "it might have been deleted already."), port_id) return levels = db.get_binding_levels(session, port_db.id, port_db.port_binding.host) port_context = driver_context.PortContext( self, plugin_context, port, network, binding, levels) return self._bind_port_if_needed(port_context) def update_port_status(self, context, port_id, status, host=None): """ Returns port_id (non-truncated uuid) if the port exists. Otherwise returns None. """ updated = False session = context.session # REVISIT: Serialize this operation with a semaphore to # prevent deadlock waiting to acquire a DB lock held by # another thread in the same process, leading to 'lock wait # timeout' errors. with contextlib.nested(lockutils.lock('db-access'), session.begin(subtransactions=True)): port = db.get_port(session, port_id) if not port: LOG.warning(_LW("Port %(port)s updated up by agent not found"), {'port': port_id}) return None if (port.status != status and port['device_owner'] != const.DEVICE_OWNER_DVR_INTERFACE): original_port = self._make_port_dict(port) port.status = status updated_port = self._make_port_dict(port) network = self.get_network(context, original_port['network_id']) levels = db.get_binding_levels(session, port_id, port.port_binding.host) mech_context = driver_context.PortContext( self, context, updated_port, network, port.port_binding, levels, original_port=original_port) self.mechanism_manager.update_port_precommit(mech_context) updated = True elif port['device_owner'] == const.DEVICE_OWNER_DVR_INTERFACE: binding = db.get_dvr_port_binding_by_host( session, port['id'], host) if not binding: return binding['status'] = status binding.update(binding) updated = True if (updated and port['device_owner'] == const.DEVICE_OWNER_DVR_INTERFACE): with contextlib.nested(lockutils.lock('db-access'), session.begin(subtransactions=True)): port = db.get_port(session, port_id) if not port: LOG.warning(_LW("Port %s not found during update"), port_id) return original_port = self._make_port_dict(port) network = self.get_network(context, original_port['network_id']) port.status = db.generate_dvr_port_status(session, port['id']) updated_port = self._make_port_dict(port) levels = db.get_binding_levels(session, port_id, host) mech_context = (driver_context.PortContext( self, context, updated_port, network, binding, levels, original_port=original_port)) self.mechanism_manager.update_port_precommit(mech_context) if updated: self.mechanism_manager.update_port_postcommit(mech_context) if port['device_owner'] == const.DEVICE_OWNER_DVR_INTERFACE: db.delete_dvr_port_binding_if_stale(session, binding) return port['id'] def port_bound_to_host(self, context, port_id, host): port = db.get_port(context.session, port_id) if not port: LOG.debug("No Port match for: %s", port_id) return False if port['device_owner'] == const.DEVICE_OWNER_DVR_INTERFACE: bindings = db.get_dvr_port_bindings(context.session, port_id) for b in bindings: if b.host == host: return True LOG.debug("No binding found for DVR port %s", port['id']) return False else: port_host = db.get_port_binding_host(port_id) return (port_host == host) def get_ports_from_devices(self, devices): port_ids_to_devices = dict((self._device_to_port_id(device), device) for device in devices) port_ids = port_ids_to_devices.keys() ports = db.get_ports_and_sgs(port_ids) for port in ports: # map back to original requested id port_id = next((port_id for port_id in port_ids if port['id'].startswith(port_id)), None) port['device'] = port_ids_to_devices.get(port_id) return ports def _device_to_port_id(self, device): # REVISIT(rkukura): Consider calling into MechanismDrivers to # process device names, or having MechanismDrivers supply list # of device prefixes to strip. if device.startswith(const.TAP_DEVICE_PREFIX): return device[len(const.TAP_DEVICE_PREFIX):] else: # REVISIT(irenab): Consider calling into bound MD to # handle the get_device_details RPC, then remove the 'else' clause if not uuidutils.is_uuid_like(device): port = db.get_port_from_device_mac(device) if port: return port.id return device