neutron核心资源拓展开发

背景：接触openstack开发后，一直做的是非核心资源的开发，大多是CRUD操作，其开发过程比较单一，前段时间接到了一个需求，需求如下：port资源的CRUD操作内加入两个新的字段，接到需求后，未经调研，以为与非核心资源开发类似，因此报了个很短的排期，着手开发后，发现核心资源开发逻辑很乱，因此熬夜加班，花了两倍＋的工时才将操作完成，因此记录此开发过程。

流程图：红色为新建文件，蓝色为修改文件。

neutron_lib内文件更改(红色加粗代码为add代码)

涉及文件：
- neutron_lib/api/definitions/__init__.py
- neutron_lib/api/definitions/base.py
- neutron_lib/api/definitions/flow_limit.py 新加的文件
- neutron_lib/api/definitions/flow_setup_limit.py 新加的文件

　代码：

flow_limit.py　

from neutron_lib.api import converters
from neutron_lib.api.definitions import port


# The alias of the extension.
ALIAS = 'flow_limit'

# The label to lookup the plugin in the plugin directory. It can match the
# alias, as required.
LABEL = 'flow_limit'

# Whether or not this extension is simply signaling behavior to the user
# or it actively modifies the attribute map.
IS_SHIM_EXTENSION = False

# Whether the extension is marking the adoption of standardattr model for
# legacy resources, or introducing new standardattr attributes. False or
# None if the standardattr model is adopted since the introduction of
# resource extension.
# If this is True, the alias for the extension should be prefixed with
# 'standard-attr-'.
IS_STANDARD_ATTR_EXTENSION = False

# The name of the extension.
NAME = 'Flow limit'

# A prefix for API resources. An empty prefix means that the API is going
# to be exposed at the v2/ level as any other core resource.
API_PREFIX = ''

# The description of the extension.
DESCRIPTION = "Provides flow limit"

# A timestamp of when the extension was introduced.
UPDATED_TIMESTAMP = "2012-07-23T10:00:00-00:00"

# Extension
RESOURCE_ATTRIBUTE_MAP = {
    port.COLLECTION_NAME: {
        'flow_limit': {'allow_post': True, 'allow_put': True,
                        'default': 50000,
                        'convert_to': converters.convert_to_int,
                        'enforce_policy': True,
                        'validate': {'type:range_or_none': [1,500000]},
                        'is_visible': True}
    }
}

# The subresource attribute map for the extension. It adds child resources
# to main extension's resource. The subresource map must have a parent and
# a parameters entry. If an extension does not need such a map, None can
# be specified (mandatory).
SUB_RESOURCE_ATTRIBUTE_MAP = {}

# The action map: it associates verbs with methods to be performed on
# the API resource.
ACTION_MAP = {}

# The action status.
ACTION_STATUS = {
}

# The list of required extensions.
REQUIRED_EXTENSIONS = []

# The list of optional extensions.
OPTIONAL_EXTENSIONS = []

flow_setup_limit.py

from neutron_lib.api import converters
from neutron_lib.api.definitions import port




# The alias of the extension.
ALIAS = 'flow_setup_limit'

# The label to lookup the plugin in the plugin directory. It can match the
# alias, as required.
LABEL = 'flow_setup_limit'

# Whether or not this extension is simply signaling behavior to the user
# or it actively modifies the attribute map.
IS_SHIM_EXTENSION = False

# Whether the extension is marking the adoption of standardattr model for
# legacy resources, or introducing new standardattr attributes. False or
# None if the standardattr model is adopted since the introduction of
# resource extension.
# If this is True, the alias for the extension should be prefixed with
# 'standard-attr-'.
IS_STANDARD_ATTR_EXTENSION = False

# The name of the extension.
NAME = 'Flow Setup limit'

# A prefix for API resources. An empty prefix means that the API is going
# to be exposed at the v2/ level as any other core resource.
API_PREFIX = ''

# The description of the extension.
DESCRIPTION = "Provides flow setup limit"

# A timestamp of when the extension was introduced.
UPDATED_TIMESTAMP = "2012-07-23T10:00:00-00:00"


RESOURCE_ATTRIBUTE_MAP = {
    port.COLLECTION_NAME: {
        'flow_setup_limit': {'allow_post': True, 'allow_put': True,
                        'default': 2000,
                        'convert_to': converters.convert_to_int,
                        'enforce_policy': True,
                        'validate': {'type:range_or_none': [1,40000]},
                        'is_visible': True}
    }
}

# The subresource attribute map for the extension. It adds child resources
# to main extension's resource. The subresource map must have a parent and
# a parameters entry. If an extension does not need such a map, None can
# be specified (mandatory).
SUB_RESOURCE_ATTRIBUTE_MAP = {}

# The action map: it associates verbs with methods to be performed on
# the API resource.
ACTION_MAP = {}

# The action status.
ACTION_STATUS = {
}

# The list of required extensions.
REQUIRED_EXTENSIONS = []

# The list of optional extensions.
OPTIONAL_EXTENSIONS = []

　__init__.py

from neutron_lib.api.definitions import agent
from neutron_lib.api.definitions import auto_allocated_topology
from neutron_lib.api.definitions import bgpvpn
from neutron_lib.api.definitions import bgpvpn_routes_control
from neutron_lib.api.definitions import data_plane_status
from neutron_lib.api.definitions import dns
from neutron_lib.api.definitions import dns_domain_ports
from neutron_lib.api.definitions import expose_port_forwarding_in_fip
from neutron_lib.api.definitions import external_net
from neutron_lib.api.definitions import extra_dhcp_opt
from neutron_lib.api.definitions import flow_limit
from neutron_lib.api.definitions import flow_setup_limit
from neutron_lib.api.definitions import fip64
from neutron_lib.api.definitions import firewall
from neutron_lib.api.definitions import firewall_v2
from neutron_lib.api.definitions import firewallrouterinsertion
from neutron_lib.api.definitions import floating_ip_port_forwarding
from neutron_lib.api.definitions import ip_substring_port_filtering
from neutron_lib.api.definitions import l3
from neutron_lib.api.definitions import logging
from neutron_lib.api.definitions import logging_resource
from neutron_lib.api.definitions import network
from neutron_lib.api.definitions import network_mtu
from neutron_lib.api.definitions import port
from neutron_lib.api.definitions import port_security
from neutron_lib.api.definitions import portbindings
from neutron_lib.api.definitions import portbindings_extended
from neutron_lib.api.definitions import provider_net
from neutron_lib.api.definitions import router_interface_fip
from neutron_lib.api.definitions import subnet
from neutron_lib.api.definitions import subnetpool
from neutron_lib.api.definitions import trunk
from neutron_lib.api.definitions import trunk_details


_ALL_API_DEFINITIONS = {
    address_scope,
    agent,
    auto_allocated_topology,
    bgpvpn,
    bgpvpn_routes_control,
    data_plane_status,
    dns,
    dns_domain_ports,
    external_net,
    expose_port_forwarding_in_fip,
    extra_dhcp_opt,
    flow_limit,
    flow_setup_limit,
    fip64,
    firewall,
    firewall_v2,
    firewallrouterinsertion,
    floating_ip_port_forwarding,
    ip_substring_port_filtering,
    l3,
    logging,
    logging_resource,
    network,

base.py

    'data-plane-status',
    'default-subnetpools',
    'dhcp_agent_scheduler',
    'dns-domain-ports',
    'dns-integration',
    'dvr',
    'expose-port-forwarding-in-fip',
    'ext-gw-mode',
    'external-net',
    'extra_dhcp_opt',
    'flow_limit',
    'flow_setup_limit',
    'extraroute',
    'flavors',
    'floating-ip-port-forwarding',
    'ip-substring-filtering',
    'l3-ha',
    'l3_agent_scheduler',
    'logging',
    'metering',
    'multi-provider',
    'net-mtu',

neutron内文件更改(以flow_limit为例）

涉及文件：

neutron/extensions/flow_limit.py

from neutron_lib.api.definitions import flow_limit
from neutron_lib.api import extensions


class Flow_limit(extensions.APIExtensionDescriptor):
    api_definition = flow_limit

neutron/objects/port/extensions/flow_limit.py 定义与port绑定的extension

#    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_versionedobjects import fields as obj_fields

from neutron.db.flow_limit import models
from neutron.objects import base
from neutron.objects import common_types



@base.NeutronObjectRegistry.register
class FlowLimit(base.NeutronDbObject):
    # Version 1.0: Initial version
    VERSION = '1.0'

    db_model = models.FlowLimit

    fields = {
         'id': common_types.UUIDField(),
         'flow_limit': obj_fields.IntegerField(),
    }

    foreign_keys = {
        'Port': {'id': 'id'},
    }

    fields_need_translation = {'id': 'port_id'}

neutron/objects/ports.py （引入拓展）

  ),
        'binding': obj_fields.ObjectField(
            'PortBinding', nullable=True
        ),
        'data_plane_status': obj_fields.ObjectField(
            'PortDataPlaneStatus', nullable=True
        ),
        'dhcp_options': obj_fields.ListOfObjectsField(
            'ExtraDhcpOpt', nullable=True
        ),
        'flow_limit': obj_fields.ObjectField(
            'FlowLimit', nullable=True
        ),
        'flow_setup_limit': obj_fields.ObjectField(
            'FlowSetupLimit', nullable=True
        ),
        'distributed_binding': obj_fields.ObjectField(
            'DistributedPortBinding', nullable=True
        ),
        'dns': obj_fields.ObjectField('PortDNS', nullable=True),
        'fixed_ips': obj_fields.ListOfObjectsField(
            'IPAllocation', nullable=True
        ),
        # TODO(ihrachys): consider converting to boolean
        'security': obj_fields.ObjectField(
            'PortSecurity', nullable=True
        ),
        'security_group_ids': common_types.SetOfUUIDsField(
            nullable=True,
            # TODO(ihrachys): how do we safely pass a mutable default?
            default=None,
        ),
        'qos_policy_id': common_types.UUIDField(nullable=True, default=None),

        'binding_levels': obj_fields.ListOfObjectsField(
            'PortBindingLevel', nullable=True
        ),

        # TODO(ihrachys): consider adding a 'dns_assignment' fully synthetic
        # field in later object iterations
    }

    extra_filter_names = {'security_group_ids'}

    fields_no_update = ['project_id', 'network_id']

    synthetic_fields = [
        'allowed_address_pairs',
        'binding',
        'binding_levels',
        'data_plane_status',
        'dhcp_options',
        'distributed_binding',
        'dns',
        'fixed_ips',
        'qos_policy_id',
        'security',
        'flow_limit',
        'flow_setup_limit',
        'security_group_ids',
    ]

    fields_need_translation = {
        'binding': 'port_binding',
        'dhcp_options': 'dhcp_opts',
        'distributed_binding': 'distributed_port_binding',
        'security': 'port_security',
        'flow_limit': 'flow_limit',
        'flow_setup_limit': 'flow_setup_limit',
    }

    def create(self):
        fields = self.obj_get_changes()
        with self.db_context_writer(self.obj_context):
            sg_ids = self.security_group_ids
            if sg_ids is None:
                sg_ids = set()
            qos_policy_id = self.qos_policy_id
            super(Port, self).create()
            if 'security_group_ids' in fields:
                self._attach_security_groups(sg_ids)
            if 'qos_policy_id' in fields:
                self._attach_qos_policy(qos_policy_id)

    def update(self):
        fields = self.obj_get_changes()
        with self.db_context_writer(self.obj_context):
            super(Port, self).update()
            if 'security_group_ids' in fields:
                self._attach_security_groups(fields['security_group_ids'])
            if 'qos_policy_id' in fields:
                self._attach_qos_policy(fields['qos_policy_id'])

    def _attach_qos_policy(self, qos_policy_id):
        binding.QosPolicyPortBinding.delete_objects(
            self.obj_context, port_id=self.id)
        if qos_policy_id:
            port_binding_obj = binding.QosPolicyPortBinding(
                self.obj_context, policy_id=qos_policy_id, port_id=self.id)
            port_binding_obj.create()

        self.qos_policy_id = qos_policy_id
        self.obj_reset_changes(['qos_policy_id'])

    def _attach_security_groups(self, sg_ids):
        # TODO(ihrachys): consider introducing an (internal) object for the
        # binding to decouple database operations a bit more
        obj_db_api.delete_objects(
            SecurityGroupPortBinding, self.obj_context, port_id=self.id)
        if sg_ids:
            for sg_id in sg_ids:
                self._attach_security_group(sg_id)
        self.security_group_ids = sg_ids
        self.obj_reset_changes(['security_group_ids'])

    def _attach_security_group(self, sg_id):
        obj_db_api.create_object(
            SecurityGroupPortBinding, self.obj_context,
            {'port_id': self.id, 'security_group_id': sg_id}
        )

    # TODO(rossella_s): get rid of it once we switch the db model to using
    # custom types.
    @classmethod
    def modify_fields_to_db(cls, fields):
        result = super(Port, cls).modify_fields_to_db(fields)
        if 'mac_address' in result:
            result['mac_address'] = cls.filter_to_str(result['mac_address'])
        return result

    # TODO(rossella_s): get rid of it once we switch the db model to using
    # custom types.
    @classmethod
    def modify_fields_from_db(cls, db_obj):
        fields = super(Port, cls).modify_fields_from_db(db_obj)
        if 'mac_address' in fields:
            fields['mac_address'] = utils.AuthenticEUI(fields['mac_address'])
        distributed_port_binding = fields.get('distributed_binding')
        if distributed_port_binding:
            fields['distributed_binding'] = fields['distributed_binding'][0]
        else:
            fields['distributed_binding'] = None
        return fields

    def from_db_object(self, db_obj):
        super(Port, self).from_db_object(db_obj)
        # extract security group bindings
        if db_obj.get('security_groups', []):
            self.security_group_ids = {
                sg.security_group_id
                for sg in db_obj.security_groups
            }
        else:
            self.security_group_ids = set()
        self.obj_reset_changes(['security_group_ids'])

        # extract qos policy binding
        if db_obj.get('qos_policy_binding'):
            self.qos_policy_id = (
                db_obj.qos_policy_binding.policy_id
            )
        else:
            self.qos_policy_id = None
        self.obj_reset_changes(['qos_policy_id'])

    def obj_make_compatible(self, primitive, target_version):
        _target_version = versionutils.convert_version_to_tuple(target_version)

        if _target_version < (1, 1):
            primitive.pop('data_plane_status', None)

    @classmethod
    def get_ports_by_router(cls, context, router_id, owner, subnet):
        rport_qry = context.session.query(models_v2.Port).join(
            l3.RouterPort)
        ports = rport_qry.filter(
            l3.RouterPort.router_id == router_id,
            l3.RouterPort.port_type == owner,
            models_v2.Port.network_id == subnet['network_id']
        )
        return [cls._load_object(context, db_obj) for db_obj in ports.all()]

    @classmethod
    def get_ports_by_vnic_type_and_host(
            cls, context, vnic_type, host):
        query = context.session.query(models_v2.Port).join(
            ml2_models.PortBinding)
        query = query.filter(
            ml2_models.PortBinding.vnic_type == vnic_type,
            ml2_models.PortBinding.host == host)
        return [cls._load_object(context, db_obj) for db_obj in query.all()]

neutron/db/flow_limit/models.py 定义model

from neutron_lib.db import model_base
import sqlalchemy as sa
from sqlalchemy import orm

from neutron.db import models_v2


class FlowLimit(model_base.BASEV2):
    port_id = sa.Column(sa.String(36),
                        sa.ForeignKey('ports.id', ondelete="CASCADE"),
                        primary_key=True)
    flow_limit = sa.Column(sa.Integer, nullable=False)
    # Add a relationship to the Port model in order to be to able to
    # instruct SQLAlchemy to eagerly load port flow limit
    port = orm.relationship(
        models_v2.Port, load_on_pending=True,
        backref=orm.backref("flow_limit", uselist=False,
                            cascade='delete', lazy='joined'))
    revises_on_change = ('port', )

neutron/db/flowlimit_db.py
定义db操作

from neutron_lib.api.definitions import port as port_def
from neutron.db import api as db_api
from neutron.db import _resource_extend as resource_extend
from neutron.objects.port.extensions import flow_limit as obj_flow_limit


@resource_extend.has_resource_extenders
class FlowlimitDbMixin(object):
    """Mixin class to add extra options to the Flow limit file
    and associate them to a port.
    """

    def _process_port_create_flow_limit(self, context, port,
                                             flow_limit):
        with db_api.context_manager.writer.using(context):
                flow_limit_obj = obj_flow_limit.FlowLimit(
                    context,
                    id=port['id'],
                    flow_limit=flow_limit
                    )
                flow_limit_obj.create()
        return self._extend_port_flow_limit_dict(context, port)

    def _extend_port_flow_limit_dict(self, context, port):
        port['flow_limit'] = self._get_port_flow_limit_binding(
            context, port['id'])

    def _get_port_flow_limit_binding(self, context, port_id):
        opt = obj_flow_limit.FlowLimit.get_object(
                            context, id=port_id)
        return opt['flow_limit']

    def _update_flow_limit_on_port(self, context, id, port,
                                        updated_port=None):
        flt = port['port'].get('flow_limit')
        if flt:
            port_update = port['port']
            port_update["id"] = id
            opt = obj_flow_limit.FlowLimit.get_object(
                                context, id=id)
            if opt:
                with db_api.context_manager.writer.using(context):
                    opt.flow_limit = flt
                    opt.update()
            else:
                self._process_port_create_flow_limit(context, port_update, flt)
        return bool(flt)

    @staticmethod
    @resource_extend.extends([port_def.COLLECTION_NAME])
    def _extend_port_dict_flow_limit(res, port):
        flow_limit = port.flow_limit
        if flow_limit:
            res['flow_limit'] = flow_limit['flow_limit']
        return res

neutron/plugins/ml2/plugin.py plugin内创建更新时，直接调用db内定义的方法即可

from neutron.db import _utils as db_utils
from neutron.db import address_scope_db
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 flowlimit_db
from neutron.db import flowsetuplimit_db
from neutron.db.models import securitygroup as sg_models
from neutron.db import models_v2
from neutron.db import provisioning_blocks
from neutron.db.quota import driver  # noqa
from neutron.db import securitygroups_rpc_base as sg_db_rpc
from neutron.db import segments_db
from neutron.db import subnet_service_type_db_models as service_type_db
from neutron.db import vlantransparent_db
from neutron.extensions import allowedaddresspairs as addr_pair
from neutron.extensions import availability_zone as az_ext
from neutron.extensions import netmtu_writable as mtu_ext
from neutron.extensions import providernet as provider
from neutron.extensions import vlantransparent
from neutron.objects import ports as ports_obj
from neutron.objects.qos import policy as policy_object
from neutron.plugins.common import utils as p_utils
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_context
from neutron.plugins.ml2.extensions import qos as qos_ext
from neutron.plugins.ml2 import managers
from neutron.plugins.ml2 import models
from neutron.plugins.ml2 import ovo_rpc
from neutron.plugins.ml2 import rpc
from neutron.quota import resource_registry
from neutron.services.qos import qos_consts
from neutron.services.qos import qos_checker_ext
from neutron.services.segments import plugin as segments_plugin
from neutron.tooz import dist_lock

LOG = log.getLogger(__name__)

MAX_BIND_TRIES = 10


SERVICE_PLUGINS_REQUIRED_DRIVERS = {
    'qos': [qos_ext.QOS_EXT_DRIVER_ALIAS]
}


def _ml2_port_result_filter_hook(query, filters):
    values = filters and filters.get(portbindings.HOST_ID, [])
    if not values:
        return query
    bind_criteria = models.PortBinding.host.in_(values)
    return query.filter(models_v2.Port.port_binding.has(bind_criteria))


@resource_extend.has_resource_extenders
@registry.has_registry_receivers
class Ml2Plugin(db_base_plugin_v2.NeutronDbPluginV2,
                dvr_mac_db.DVRDbMixin,
                external_net_db.External_net_db_mixin,
                sg_db_rpc.SecurityGroupServerRpcMixin,
                agentschedulers_db.AZDhcpAgentSchedulerDbMixin,
                addr_pair_db.AllowedAddressPairsMixin,
                vlantransparent_db.Vlantransparent_db_mixin,
                extradhcpopt_db.ExtraDhcpOptMixin,
                flowlimit_db.FlowlimitDbMixin,
                flowsetuplimit_db.FlowsetuplimitDbMixin,
                address_scope_db.AddressScopeDbMixin,
                service_type_db.SubnetServiceTypeMixin):

    """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", "subnet_allocation",
                                    "net-mtu", "net-mtu-writable",
                                    "vlan-transparent", "flow_limit",
                                    "address-scope", "flow_setup_limit",
                                    "availability_zone",
                                    "network_availability_zone",
                                    "default-subnetpools",
                                    "subnet-service-types",
                                    "ip-substring-filtering"]

    @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)
            vlantransparent.disable_extension_by_config(aliases)
            self._aliases = aliases
        return self._aliases

    def __new__(cls, *args, **kwargs):
        model_query.register_hook(
            models_v2.Port,
            "ml2_port_bindings",
            query_hook=None,
            filter_hook=None,
            result_filters=_ml2_port_result_filter_hook)
        return super(Ml2Plugin, cls).__new__(cls, *args, **kwargs)

    @resource_registry.tracked_resources(
        network=models_v2.Network,
        port=models_v2.Port,
        subnet=models_v2.Subnet,
        subnetpool=models_v2.SubnetPool,
        security_group=sg_models.SecurityGroup,
        security_group_rule=sg_models.SecurityGroupRule)
    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_dhcp()
        self._start_rpc_notifiers()
        self.add_agent_status_check_worker(self.agent_health_check)
        self.add_workers(self.mechanism_manager.get_workers())
        self._verify_service_plugins_requirements()
        self.qos_checker = cfg.CONF.qos_checker
        if cfg.CONF.tooz.enabled:
            dist_lock.COORDINATOR.start()
            LOG.info("Tooz lock has Start.")
        LOG.info("Modular L2 Plugin initialization complete")

    def _setup_rpc(self):
        """Initialize components to support agent communication."""
        self.endpoints = [
            rpc.RpcCallbacks(self.notifier, self.type_manager),
            securitygroups_rpc.SecurityGroupServerRpcCallback(),
            dvr_rpc.DVRServerRpcCallback(),
            dhcp_rpc.DhcpRpcCallback(),
            agents_db.AgentExtRpcCallback(),
            metadata_rpc.MetadataRpcCallback(),
            resources_rpc.ResourcesPullRpcCallback()
        ]

    def _setup_dhcp(self):
        """Initialize components to support DHCP."""
        self.network_scheduler = importutils.import_object(
            cfg.CONF.network_scheduler_driver
        )
        self.add_periodic_dhcp_agent_status_check()

    def _verify_service_plugins_requirements(self):
        for service_plugin in cfg.CONF.service_plugins:
            extension_drivers = SERVICE_PLUGINS_REQUIRED_DRIVERS.get(
                service_plugin, []
            )
            for extension_driver in extension_drivers:
                if extension_driver not in self.extension_manager.names():
                    raise ml2_exc.ExtensionDriverNotFound(
                        driver=extension_driver, service_plugin=service_plugin
                    )

    @registry.receives(resources.PORT,
                       [provisioning_blocks.PROVISIONING_COMPLETE])
    def _port_provisioned(self, rtype, event, trigger, context, object_id,
                          **kwargs):
        port_id = object_id
        port = db.get_port(context, port_id)
        if not port or not port.port_binding:
            LOG.debug("Port %s was deleted so its status cannot be updated.",
                      port_id)
            return
        if port.port_binding.vif_type in (portbindings.VIF_TYPE_BINDING_FAILED,
                                          portbindings.VIF_TYPE_UNBOUND):
            # NOTE(kevinbenton): we hit here when a port is created without
            # a host ID and the dhcp agent notifies that its wiring is done
            LOG.debug("Port %s cannot update to ACTIVE because it "
                      "is not bound.", port_id)
            return
        else:
            # port is bound, but we have to check for new provisioning blocks
            # one last time to detect the case where we were triggered by an
            # unbound port and the port became bound with new provisioning
            # blocks before 'get_port' was called above
            if provisioning_blocks.is_object_blocked(context, port_id,
                                                     resources.PORT):
                LOG.debug("Port %s had new provisioning blocks added so it "
                          "will not transition to active.", port_id)
                return
        self.update_port_status(context, port_id, const.PORT_STATUS_ACTIVE)

    @log_helpers.log_method_call
    def _start_rpc_notifiers(self):
        """Initialize RPC notifiers for agents."""
        self.ovo_notifier = ovo_rpc.OVOServerRpcInterface()
        self.notifier = rpc.AgentNotifierApi(topics.AGENT)
        self.agent_notifiers[const.AGENT_TYPE_DHCP] = (
            dhcp_rpc_agent_api.DhcpAgentNotifyAPI()
        )

    @log_helpers.log_method_call
    def start_rpc_listeners(self):
        """Start the RPC loop to let the plugin communicate with agents."""
        self._setup_rpc()
        self.topic = topics.PLUGIN
        self.conn = n_rpc.create_connection()
        self.conn.create_consumer(self.topic, self.endpoints, fanout=False)
        self.conn.create_consumer(
            topics.SERVER_RESOURCE_VERSIONS,
            [resources_rpc.ResourcesPushToServerRpcCallback()],
            fanout=True)
        # process state reports despite dedicated rpc workers
        self.conn.create_consumer(topics.REPORTS,
                                  [agents_db.AgentExtRpcCallback()],
                                  fanout=False)
        return self.conn.consume_in_threads()

    def start_rpc_state_reports_listener(self):
        self.conn_reports = n_rpc.create_connection()
        self.conn_reports.create_consumer(topics.REPORTS,
                                          [agents_db.AgentExtRpcCallback()],
                                          fanout=False)
        return self.conn_reports.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 _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):
        plugin_context = mech_context._plugin_context
        binding = mech_context._binding
        port = mech_context.current
        port_id = port['id']
        changes = False

        host = const.ATTR_NOT_SPECIFIED
        if attrs and portbindings.HOST_ID in attrs:
            host = attrs.get(portbindings.HOST_ID) or ''

        original_host = binding.host
        if (validators.is_attr_set(host) and
            original_host != host):
            binding.host = host
            changes = True

        vnic_type = attrs.get(portbindings.VNIC_TYPE) if attrs else None
        if (validators.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, const.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
            # Note(jetlee): other vnic_type haven't 'anti_affinity_group'
            # expect direct port.
            # Updating port, the vnic_type isn't in attrs, so we should
            # retrieve it from port info.
            if not validators.is_attr_set(vnic_type):
                vnic_type = port.get('binding:vnic_type')
            if 'anti_affinity_group' in binding.profile and vnic_type != \
                    portbindings.VNIC_DIRECT:
                msg = _("Normal port hasn't set anti_affinity_group!!!")
                raise exc.InvalidInput(error_message=msg)

        # Unbind the port if needed.
        if changes:
            binding.vif_type = portbindings.VIF_TYPE_UNBOUND
            binding.vif_details = ''
            db.clear_binding_levels(plugin_context, port_id, original_host)
            mech_context._clear_binding_levels()
            port['status'] = const.PORT_STATUS_DOWN
            super(Ml2Plugin, self).update_port(
                mech_context._plugin_context, port_id,
                {port_def.RESOURCE_NAME: {'status': const.PORT_STATUS_DOWN}})

        if port['device_owner'] == const.DEVICE_OWNER_DVR_INTERFACE:
            binding.vif_type = portbindings.VIF_TYPE_UNBOUND
            binding.vif_details = ''
            db.clear_binding_levels(plugin_context, port_id, original_host)
            mech_context._clear_binding_levels()
            binding.host = ''

        self._update_port_dict_binding(port, binding)
        binding.persist_state_to_session(plugin_context.session)
        return changes

    @db_api.retry_db_errors
    def _bind_port_if_needed(self, context, allow_notify=False,
                             need_notify=False):
        if not context.network.network_segments:
            LOG.debug("Network %s has no segments, skipping binding",
                      context.network.current['id'])
            return context
        for count in range(1, MAX_BIND_TRIES + 1):
            if count > 1:
                # yield for binding retries so that we give other threads a
                # chance to do their work
                greenthread.sleep(0)

                # multiple attempts shouldn't happen very often so we log each
                # attempt after the 1st.
                LOG.info("Attempt %(count)s to bind port %(port)s",
                         {'count': count, 'port': context.current['id']})

            bind_context, need_notify, try_again = self._attempt_binding(
                context, need_notify)

            if count == MAX_BIND_TRIES or not try_again:
                if self._should_bind_port(context):
                    # At this point, we attempted to bind a port and reached
                    # its final binding state. Binding either succeeded or
                    # exhausted all attempts, thus no need to try again.
                    # Now, the port and its binding state should be committed.
                    context, need_notify, try_again = (
                        self._commit_port_binding(context, bind_context,
                                                  need_notify, try_again))
                else:
                    context = bind_context

            if not try_again:
                if allow_notify and need_notify:
                    self._notify_port_updated(context)
                return context

        LOG.error("Failed to commit binding results for %(port)s "
                  "after %(max)s tries",
                  {'port': context.current['id'], 'max': MAX_BIND_TRIES})
        return context

    def _should_bind_port(self, context):
        return (context._binding.host and context._binding.vif_type
                in (portbindings.VIF_TYPE_UNBOUND,
                    portbindings.VIF_TYPE_BINDING_FAILED))

    def _attempt_binding(self, context, need_notify):
        try_again = False

        if self._should_bind_port(context):
            bind_context = self._bind_port(context)

            if bind_context.vif_type != portbindings.VIF_TYPE_BINDING_FAILED:
                # Binding succeeded. Suggest notifying of successful binding.
                need_notify = True
            else:
                # Current attempt binding failed, try to bind again.
                try_again = True
            context = bind_context

        return context, need_notify, try_again

    def _bind_port(self, orig_context):
        # Construct a new PortContext from the one from the previous
        # transaction.
        port = orig_context.current
        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.current, new_binding, None,
            original_port=orig_context.original)

        # 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, orig_context, bind_context,
                             need_notify, try_again):
        port_id = orig_context.current['id']
        plugin_context = orig_context._plugin_context
        orig_binding = orig_context._binding
        new_binding = bind_context._binding

        # TODO(yamahata): revise what to be passed or new resource
        # like PORTBINDING should be introduced?
        # It would be addressed during EventPayload conversion.
        registry.notify(resources.PORT, events.BEFORE_UPDATE, self,
                        context=plugin_context, port=orig_context.current,
                        original_port=orig_context.current,
                        orig_binding=orig_binding, new_binding=new_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.
        with db_api.context_manager.writer.using(plugin_context):
            # Get the current port state and build a new PortContext
            # reflecting this state as original state for subsequent
            # mechanism driver update_port_*commit() calls.
            try:
                port_db = self._get_port(plugin_context, port_id)
                cur_binding = port_db.port_binding
            except exc.PortNotFound:
                port_db, cur_binding = None, None
            if not port_db or not cur_binding:
                # 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 orig_context, False, False
            # 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, the try_again
            # flag is returned to indicate that the commit was unsuccessful.
            oport = self._make_port_dict(port_db)
            port = self._make_port_dict(port_db)
            network = bind_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 port_db.port_binding above, is
                # currently not used for DVR distributed ports, and is
                # replaced here with the DistributedPortBinding instance from
                # the ml2_distributed_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_distributed_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_distributed_port_binding_by_host(
                    plugin_context, 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(plugin_context, port_id,
                                        cur_binding.host)
                db.set_binding_levels(plugin_context,
                                      bind_context._binding_levels)
                # refresh context with a snapshot of updated state
                cur_context._binding = driver_context.InstanceSnapshot(
                    cur_binding)
                cur_context._binding_levels = bind_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 (bind_context._binding_levels and
                    bind_context._new_port_status):
                    port_db.status = bind_context._new_port_status
                    port['status'] = bind_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:
            # Continue, using the port state as of the transaction that
            # just finished, whether that transaction committed new
            # results or discovered concurrent port state changes.
            # Also, Trigger notification for successful binding commit.
            kwargs = {
                'context': plugin_context,
                'port': self._make_port_dict(port_db),  # ensure latest state
                'mac_address_updated': False,
                'original_port': oport,
            }
            registry.notify(resources.PORT, events.AFTER_UPDATE,
                            self, **kwargs)
            self.mechanism_manager.update_port_postcommit(cur_context)
            need_notify = True
            try_again = False
        else:
            try_again = True

        return cur_context, need_notify, try_again

    def _update_port_dict_binding(self, port, binding):
        port[portbindings.VNIC_TYPE] = binding.vnic_type
        port[portbindings.PROFILE] = self._get_profile(binding)
        if port['device_owner'] == const.DEVICE_OWNER_DVR_INTERFACE:
            port[portbindings.HOST_ID] = ''
            port[portbindings.VIF_TYPE] = portbindings.VIF_TYPE_DISTRIBUTED
            port[portbindings.VIF_DETAILS] = {}
        else:
            port[portbindings.HOST_ID] = binding.host
            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("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("Serialized profile DB value '%(value)s' for "
                          "port %(port)s is invalid",
                          {'value': binding.profile,
                           'port': binding.port_id})
        return {}

    @staticmethod
    @resource_extend.extends([port_def.COLLECTION_NAME])
    def _ml2_extend_port_dict_binding(port_res, port_db):
        plugin = directory.get_plugin()
        # None when called during unit tests for other plugins.
        if port_db.port_binding:
            plugin._update_port_dict_binding(port_res, port_db.port_binding)

    # ML2's resource extend functions allow extension drivers that extend
    # attributes for the resources to add those attributes to the result.

    @staticmethod
    @resource_extend.extends([net_def.COLLECTION_NAME])
    def _ml2_md_extend_network_dict(result, netdb):
        plugin = directory.get_plugin()
        session = plugin._object_session_or_new_session(netdb)
        plugin.extension_manager.extend_network_dict(session, netdb, result)

    @staticmethod
    @resource_extend.extends([port_def.COLLECTION_NAME])
    def _ml2_md_extend_port_dict(result, portdb):
        plugin = directory.get_plugin()
        session = plugin._object_session_or_new_session(portdb)
        plugin.extension_manager.extend_port_dict(session, portdb, result)

    @staticmethod
    @resource_extend.extends([subnet_def.COLLECTION_NAME])
    def _ml2_md_extend_subnet_dict(result, subnetdb):
        plugin = directory.get_plugin()
        session = plugin._object_session_or_new_session(subnetdb)
        plugin.extension_manager.extend_subnet_dict(session, subnetdb, result)

    @staticmethod
    def _object_session_or_new_session(sql_obj):
        session = sqlalchemy.inspect(sql_obj).session
        if not session:
            session = db_api.get_reader_session()
        return session

    def _notify_port_updated(self, mech_context):
        port = mech_context.current
        segment = mech_context.bottom_bound_segment
        if not segment:
            # REVISIT(rkukura): This should notify agent to unplug port
            network = mech_context.network.current
            LOG.debug("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("Could not find %s to delete.",
                              resource)
            except Exception:
                LOG.exception("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]
        obj_before_create = getattr(self, '_before_create_%s' % resource)
        for item in items:
            obj_before_create(context, item)
        with db_api.context_manager.writer.using(context):
            obj_creator = getattr(self, '_create_%s_db' % resource)
            for item in items:
                try:
                    attrs = item[resource]
                    result, mech_context = obj_creator(context, item)
                    objects.append({'mech_context': mech_context,
                                    'result': result,
                                    'attributes': attrs})

                except Exception as e:
                    with excutils.save_and_reraise_exception():
                        utils.attach_exc_details(
                            e, ("An exception occurred while creating "
                                "the %(resource)s:%(item)s"),
                            {'resource': resource, 'item': item})

        postcommit_op = getattr(self, '_after_create_%s' % resource)
        for obj in objects:
            try:
                postcommit_op(context, obj['result'], obj['mech_context'])
            except Exception:
                with excutils.save_and_reraise_exception():
                    resource_ids = [res['result']['id'] for res in objects]
                    LOG.exception("ML2 _after_create_%(res)s "
                                  "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)})
                    # _after_handler will have deleted the object that threw
                    to_delete = [o for o in objects if o != obj]
                    self._delete_objects(context, resource, to_delete)
        return objects

    def _get_network_mtu(self, network_db, validate=True):
        mtus = []
        try:
            segments = network_db['segments']
        except KeyError:
            segments = [network_db]
        for s in segments:
            segment_type = s.get('network_type')
            if segment_type is None:
                continue
            try:
                type_driver = self.type_manager.drivers[segment_type].obj
            except KeyError:
                # NOTE(ihrachys) This can happen when type driver is not loaded
                # for an existing segment, or simply when the network has no
                # segments at the specific time this is computed.
                # In the former case, while it's probably an indication of
                # a bad setup, it's better to be safe than sorry here. Also,
                # several unit tests use non-existent driver types that may
                # trigger the exception here.
                if segment_type and s['segmentation_id']:
                    LOG.warning(
                        "Failed to determine MTU for segment "
                        "%(segment_type)s:%(segment_id)s; network "
                        "%(network_id)s MTU calculation may be not "
                        "accurate",
                        {
                            'segment_type': segment_type,
                            'segment_id': s['segmentation_id'],
                            'network_id': network_db['id'],
                        }
                    )
            else:
                mtu = type_driver.get_mtu(s['physical_network'])
                # Some drivers, like 'local', may return None; the assumption
                # then is that for the segment type, MTU has no meaning or
                # unlimited, and so we should then ignore those values.
                if mtu:
                    mtus.append(mtu)

        max_mtu = min(mtus) if mtus else p_utils.get_deployment_physnet_mtu()
        net_mtu = network_db.get('mtu')

        if validate:
            # validate that requested mtu conforms to allocated segments
            if net_mtu and max_mtu and max_mtu < net_mtu:
                msg = _("Requested MTU is too big, maximum is %d") % max_mtu
                raise exc.InvalidInput(error_message=msg)

        # if mtu is not set in database, use the maximum possible
        return net_mtu or max_mtu

    def _before_create_network(self, context, network):
        net_data = network[net_def.RESOURCE_NAME]
        registry.notify(resources.NETWORK, events.BEFORE_CREATE, self,
                        context=context, network=net_data)

    def _create_network_db(self, context, network):
        net_data = network[net_def.RESOURCE_NAME]
        tenant_id = net_data['tenant_id']
        with db_api.context_manager.writer.using(context):
            net_db = self.create_network_db(context, network)
            net_data['id'] = net_db.id
            self.type_manager.create_network_segments(context, net_data,
                                                      tenant_id)
            net_db.mtu = self._get_network_mtu(net_db, validate=False)

            result = self._make_network_dict(net_db, process_extensions=False,
                                             context=context)

            self.extension_manager.process_create_network(
                context,
                # NOTE(ihrachys) extensions expect no id in the dict
                {k: v for k, v in net_data.items() if k != 'id'},
                result)

            self._process_l3_create(context, result, net_data)
            self.type_manager.extend_network_dict_provider(context, result)

            # Update the transparent vlan if configured
            if utils.is_extension_supported(self, 'vlan-transparent'):
                vlt = vlantransparent.get_vlan_transparent(net_data)
                net_db['vlan_transparent'] = vlt
                result['vlan_transparent'] = vlt

            if az_ext.AZ_HINTS in net_data:
                self.validate_availability_zones(context, 'network',
                                                 net_data[az_ext.AZ_HINTS])
                az_hints = az_ext.convert_az_list_to_string(
                                                net_data[az_ext.AZ_HINTS])
                net_db[az_ext.AZ_HINTS] = az_hints
                result[az_ext.AZ_HINTS] = az_hints
            registry.notify(resources.NETWORK, events.PRECOMMIT_CREATE, self,
                            context=context, request=net_data, network=result)

            resource_extend.apply_funcs('networks', result, net_db)
            mech_context = driver_context.NetworkContext(self, context,
                                                         result)
            self.mechanism_manager.create_network_precommit(mech_context)
        return result, mech_context

    @utils.transaction_guard
    @db_api.retry_if_session_inactive()
    def create_network(self, context, network):
        self._before_create_network(context, network)
        result, mech_context = self._create_network_db(context, network)
        return self._after_create_network(context, result, mech_context)

    def _after_create_network(self, context, result, mech_context):
        kwargs = {'context': context, 'network': result}
        registry.notify(resources.NETWORK, events.AFTER_CREATE, self, **kwargs)
        try:
            self.mechanism_manager.create_network_postcommit(mech_context)
        except ml2_exc.MechanismDriverError:
            with excutils.save_and_reraise_exception():
                LOG.error("mechanism_manager.create_network_postcommit "
                          "failed, deleting network '%s'", result['id'])
                self.delete_network(context, result['id'])

        return result

    @utils.transaction_guard
    @db_api.retry_if_session_inactive()
    def create_network_bulk(self, context, networks):
        objects = self._create_bulk_ml2(
            net_def.RESOURCE_NAME, context, networks)
        return [obj['result'] for obj in objects]

    @utils.transaction_guard
    @db_api.retry_if_session_inactive()
    def update_network(self, context, id, network):
        net_data = network[net_def.RESOURCE_NAME]
        provider._raise_if_updates_provider_attributes(net_data)
        need_network_update_notify = False

        with db_api.context_manager.writer.using(context):
            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)

            # ToDO(QoS): This would change once EngineFacade moves out
            db_network = self._get_network(context, id)
            # Expire the db_network in current transaction, so that the join
            # relationship can be updated.
            context.session.expire(db_network)

            if mtu_ext.MTU in net_data:
                db_network.mtu = self._get_network_mtu(db_network,
                                                       validate=False)
                # agents should now update all ports to reflect new MTU
                need_network_update_notify = True

            updated_network = self._make_network_dict(
                db_network, context=context)
            self.type_manager.extend_network_dict_provider(
                context, updated_network)

            kwargs = {'context': context, 'network': updated_network,
                      'original_network': original_network,
                      'request': net_data}
            registry.notify(
                resources.NETWORK, events.PRECOMMIT_UPDATE, self, **kwargs)

            # TODO(QoS): Move out to the extension framework somehow.
            qos_update_notify = (
                qos_consts.QOS_POLICY_ID in net_data and
                original_network[qos_consts.QOS_POLICY_ID] !=
                updated_network[qos_consts.QOS_POLICY_ID])
            # Do qos check if qos updated and has qos_checker
            if self.qos_checker and qos_update_notify:
                self._qos_check(context,
                                original_network[qos_consts.QOS_POLICY_ID],
                                updated_network[qos_consts.QOS_POLICY_ID],
                                network=id)
            need_network_update_notify |= qos_update_notify

            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 propagated to the caller, which is expected to
        # either undo/retry the operation or delete the resource.
        kwargs = {'context': context, 'network': updated_network,
                  'original_network': original_network}
        registry.notify(resources.NETWORK, events.AFTER_UPDATE, self, **kwargs)
        self.mechanism_manager.update_network_postcommit(mech_context)
        if need_network_update_notify:
            self.notifier.network_update(context, updated_network)
        return updated_network

    def _qos_check(self, context, original_qos_policy_id,
                   updated_qos_policy_id, network=None,
                   port=None):
        # Note(jetlee): check associated qos policy could change or not
        dvalue = {}
        original_qos_policy = policy_object.QosPolicy.get_object(
            context, id=original_qos_policy_id)
        updated_qos_policy = policy_object.QosPolicy.get_object(
            context, id=updated_qos_policy_id)
        for u_rule in updated_qos_policy.rules:
            direction = u_rule.direction
            o_rule_updated = False
            if original_qos_policy:
                for o_rule in original_qos_policy.rules:
                    if o_rule.direction != direction:
                        continue
                    o_rule_updated = True
                    value_tmp = u_rule.max_kbps - \
                                        o_rule.max_kbps
                    # if rule max_kbps was decreased, we shouldn't
                    # take care of it
                    if value_tmp > 0:
                        dvalue[direction] = value_tmp
            # if original rule hasn't this direction
            if not o_rule_updated:
                dvalue[direction] = u_rule.max_kbps

        if dvalue:
            self._validate_qos_policy_could_change(context,
                                                   updated_qos_policy,
                                                   dvalue,
                                                   network=network,
                                                   port=port)

    def _validate_qos_policy_could_change(self, context, policy, dvalue,
                                          network=None, port=None):
        # get all ports, which associated network
        if network:
            ports = super(Ml2Plugin, self).get_ports(context,
                                    filters={'network_id': [network]})
        else:
            # get details of specified port
            ports = [port]

        compute_nodes = []
        ports_host_map = {}
        ports_sub = []
        cn_bandwidth = {}

        # get all compute_nodes name and filter a part of ports
        # which are active instance port
        for port in ports:
            if const.DEVICE_OWNER_COMPUTE_PREFIX in port.get('device_owner') \
                    and port.get('status') == const.PORT_STATUS_ACTIVE:
                hostname = port.get('binding:host_id')
                compute_nodes.append(hostname)
                ports_sub.append(port)
                if hostname in ports_host_map:
                    ports_host_map[hostname].append(port.get('id'))
                else:
                    ports_host_map[hostname] = [port.get('id')]

        # get bandwidth information of all compute nodes
        cn_bandwidth = \
            qos_checker_ext.get_all_compute_nodes_bandwidth(compute_nodes)
        LOG.debug("Those ports %(ports)s remain in host, and these hosts "
                  "bandwidth are %(bandwidth)s.\n",
                  {'ports': ports_host_map, 'bandwidth': cn_bandwidth})

        # compute bandwidth of compute nodes have enough resources or not
        for port in ports_sub:
            hostname = port.get('binding:host_id')
            port_binding_profile = port.get("binding:profile")
            # Note(jetlee): if host hasn't bandwidth, we should skip it
            if hostname not in cn_bandwidth:
                continue
            # SRIOV port
            if port.get('binding:vif_type') == \
                    portbindings.VIF_TYPE_HW_VEB and \
                    cn_bandwidth[hostname].get('pci_devices'):
                port_pci_slot = port_binding_profile.get('pci_slot')
                port_pci_slot = port_pci_slot.replace(':', '_')
                port_pci_slot = port_pci_slot.replace('.', '_')
                port_pci_slot = 'pci_' + port_pci_slot
                parent_addr = \
                    cn_bandwidth[hostname]['pci_devices'].get(port_pci_slot)
                if not parent_addr:
                    continue
                for nic in cn_bandwidth[hostname]:
                    # If extra_resources hasn't 'pci_slot', we should skip it
                    if not cn_bandwidth[hostname][nic].get('pci_slot'):
                        continue
                    for direction in dvalue:
                        if parent_addr == \
                                cn_bandwidth[hostname][nic].get('pci_slot'):
                            cn_bandwidth[hostname][nic][direction] -= \
                                dvalue[direction]
                            if cn_bandwidth[hostname][nic][direction] < 0:
                                qos_updated_obj = network if network \
                                    else port.get('id')
                                raise n_exc.QosPolicyCannotUpdate(
                                    network_or_port=qos_updated_obj,
                                    policy_id=policy.id,
                                    hostname=hostname,
                                    ports=ports_host_map[hostname])
            # OVS port
            elif port.get('binding:vif_type') in (portbindings.VIF_TYPE_OVS,
                    portbindings.VIF_TYPE_VHOST_USER):
                for nic in cn_bandwidth[hostname]:
                    for direction in dvalue:
                        cn_bandwidth[hostname][nic][direction] -= \
                            dvalue[direction]
                        if cn_bandwidth[hostname][nic][direction] < 0:
                            qos_updated_obj = network if network \
                                else port.get('id')
                            raise n_exc.QosPolicyCannotUpdate(
                                network_or_port=qos_updated_obj,
                                policy_id=policy.id,
                                hostname=hostname,
                                ports=ports_host_map[hostname])
            # we don't take unbound or other vif_type into consideration
            else:
                continue

    @db_api.retry_if_session_inactive()
    def get_network(self, context, id, fields=None):
        with db_api.context_manager.reader.using(context):
            net_db = self._get_network(context, id)

            net_data = self._make_network_dict(net_db, context=context)
            self.type_manager.extend_network_dict_provider(context, net_data)

        return db_utils.resource_fields(net_data, fields)

    @db_api.retry_if_session_inactive()
    def get_networks(self, context, filters=None, fields=None,
                     sorts=None, limit=None, marker=None, page_reverse=False):
        with db_api.context_manager.reader.using(context):
            nets_db = super(Ml2Plugin, self)._get_networks(
                context, filters, None, sorts, limit, marker, page_reverse)

            net_data = []
            for net in nets_db:
                net_data.append(self._make_network_dict(net, context=context))

            self.type_manager.extend_networks_dict_provider(context, net_data)
            nets = self._filter_nets_provider(context, net_data, filters)
        return [db_utils.resource_fields(net, fields) for net in nets]

    def get_network_contexts(self, context, network_ids):
        """Return a map of network_id to NetworkContext for network_ids."""
        net_filters = {'id': list(set(network_ids))}
        nets_by_netid = {
            n['id']: n for n in self.get_networks(context,
                                                  filters=net_filters)
        }
        segments_by_netid = segments_db.get_networks_segments(
            context, list(nets_by_netid.keys()))
        netctxs_by_netid = {
            net_id: driver_context.NetworkContext(
                self, context, nets_by_netid[net_id],
                segments=segments_by_netid[net_id])
            for net_id in nets_by_netid.keys()
        }
        return netctxs_by_netid

    @utils.transaction_guard
    def delete_network(self, context, id):
        # the only purpose of this override is to protect this from being
        # called inside of a transaction.
        return super(Ml2Plugin, self).delete_network(context, id)

    @registry.receives(resources.NETWORK, [events.PRECOMMIT_DELETE])
    def _network_delete_precommit_handler(self, rtype, event, trigger,
                                          context, network_id, **kwargs):
        network = self.get_network(context, network_id)
        mech_context = driver_context.NetworkContext(self,
                                                     context,
                                                     network)
        # TODO(kevinbenton): move this mech context into something like
        # a 'delete context' so it's not polluting the real context object
        setattr(context, '_mech_context', mech_context)
        self.mechanism_manager.delete_network_precommit(
            mech_context)

    @registry.receives(resources.NETWORK, [events.AFTER_DELETE])
    def _network_delete_after_delete_handler(self, rtype, event, trigger,
                                             context, network, **kwargs):
        try:
            self.mechanism_manager.delete_network_postcommit(
                context._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("mechanism_manager.delete_network_postcommit"
                      " failed")
        self.notifier.network_delete(context, network['id'])

    def _before_create_subnet(self, context, subnet):
        # TODO(kevinbenton): BEFORE notification should be added here
        pass

    def _create_subnet_db(self, context, subnet):
        with db_api.context_manager.writer.using(context):
            result, net_db, ipam_sub = self._create_subnet_precommit(
                context, subnet)

            self.extension_manager.process_create_subnet(
                context, subnet[subnet_def.RESOURCE_NAME], result)
            network = self._make_network_dict(net_db, context=context)
            self.type_manager.extend_network_dict_provider(context, network)
            mech_context = driver_context.SubnetContext(self, context,
                                                        result, network)
            self.mechanism_manager.create_subnet_precommit(mech_context)

        # TODO(kevinbenton): move this to '_after_subnet_create'
        # db base plugin post commit ops
        self._create_subnet_postcommit(context, result, net_db, ipam_sub)

        return result, mech_context

    @utils.transaction_guard
    @db_api.retry_if_session_inactive()
    def create_subnet(self, context, subnet):
        self._before_create_subnet(context, subnet)
        result, mech_context = self._create_subnet_db(context, subnet)
        return self._after_create_subnet(context, result, mech_context)

    def _after_create_subnet(self, context, result, mech_context):
        kwargs = {'context': context, 'subnet': result}
        registry.notify(resources.SUBNET, events.AFTER_CREATE, self, **kwargs)
        try:
            self.mechanism_manager.create_subnet_postcommit(mech_context)
        except ml2_exc.MechanismDriverError:
            with excutils.save_and_reraise_exception():
                LOG.error("mechanism_manager.create_subnet_postcommit "
                          "failed, deleting subnet '%s'", result['id'])
                self.delete_subnet(context, result['id'])
        return result

    @utils.transaction_guard
    @db_api.retry_if_session_inactive()
    def create_subnet_bulk(self, context, subnets):
        objects = self._create_bulk_ml2(
            subnet_def.RESOURCE_NAME, context, subnets)
        return [obj['result'] for obj in objects]

    @utils.transaction_guard
    @db_api.retry_if_session_inactive()
    def update_subnet(self, context, id, subnet):
        with db_api.context_manager.writer.using(context):
            updated_subnet, original_subnet = self._update_subnet_precommit(
                context, id, subnet)
            self.extension_manager.process_update_subnet(
                context, subnet[subnet_def.RESOURCE_NAME], updated_subnet)
            updated_subnet = self.get_subnet(context, id)
            mech_context = driver_context.SubnetContext(
                self, context, updated_subnet, network=None,
                original_subnet=original_subnet)
            self.mechanism_manager.update_subnet_precommit(mech_context)

        self._update_subnet_postcommit(context, original_subnet,
                                       updated_subnet)
        # TODO(apech) - handle errors raised by update_subnet, potentially
        # by re-calling update_subnet with the previous attributes. For
        # now the error is propagated 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

    @utils.transaction_guard
    def delete_subnet(self, context, id):
        # the only purpose of this override is to protect this from being
        # called inside of a transaction.
        return super(Ml2Plugin, self).delete_subnet(context, id)

    @registry.receives(resources.SUBNET, [events.PRECOMMIT_DELETE])
    def _subnet_delete_precommit_handler(self, rtype, event, trigger,
                                         context, subnet_id, **kwargs):
        record = self._get_subnet(context, subnet_id)
        subnet = self._make_subnet_dict(record, context=context)
        network = self.get_network(context, subnet['network_id'])
        mech_context = driver_context.SubnetContext(self, context,
                                                    subnet, network)
        # TODO(kevinbenton): move this mech context into something like
        # a 'delete context' so it's not polluting the real context object
        setattr(context, '_mech_context', mech_context)
        self.mechanism_manager.delete_subnet_precommit(mech_context)

    @registry.receives(resources.SUBNET, [events.AFTER_DELETE])
    def _subnet_delete_after_delete_handler(self, rtype, event, trigger,
                                            context, subnet, **kwargs):
        try:
            self.mechanism_manager.delete_subnet_postcommit(
                context._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("mechanism_manager.delete_subnet_postcommit failed")

    # TODO(yalei) - will be simplified after security group and address pair be
    # converted to ext driver too.
    def _portsec_ext_port_create_processing(self, context, port_data, port):
        attrs = port[port_def.RESOURCE_NAME]
        port_security = ((port_data.get(psec.PORTSECURITY) is None) or
                         port_data[psec.PORTSECURITY])

        # allowed address pair checks
        if self._check_update_has_allowed_address_pairs(port):
            if not port_security:
                raise addr_pair.AddressPairAndPortSecurityRequired()
        else:
            # remove ATTR_NOT_SPECIFIED
            attrs[addr_pair.ADDRESS_PAIRS] = []

        if port_security:
            self._ensure_default_security_group_on_port(context, port)
        elif self._check_update_has_security_groups(port):
            raise psec_exc.PortSecurityAndIPRequiredForSecurityGroups()

    def _setup_dhcp_agent_provisioning_component(self, context, port):
        subnet_ids = [f['subnet_id'] for f in port['fixed_ips']]
        if (db.is_dhcp_active_on_any_subnet(context, subnet_ids) and
            len(self.get_dhcp_agents_hosting_networks(context,
                                                      [port['network_id']]))):
            # the agents will tell us when the dhcp config is ready so we setup
            # a provisioning component to prevent the port from going ACTIVE
            # until a dhcp_ready_on_port notification is received.
            provisioning_blocks.add_provisioning_component(
                context, port['id'], resources.PORT,
                provisioning_blocks.DHCP_ENTITY)
        else:
            provisioning_blocks.remove_provisioning_component(
                context, port['id'], resources.PORT,
                provisioning_blocks.DHCP_ENTITY)

    def _before_create_port(self, context, port):
        attrs = port[port_def.RESOURCE_NAME]
        if not attrs.get('status'):
            attrs['status'] = const.PORT_STATUS_DOWN

        registry.notify(resources.PORT, events.BEFORE_CREATE, self,
                        context=context, port=attrs)

    def _create_port_db(self, context, port):
        attrs = port[port_def.RESOURCE_NAME]
        with db_api.context_manager.writer.using(context):
            dhcp_opts = attrs.get(edo_ext.EXTRADHCPOPTS, [])
            flow_limit = attrs.get('flow_limit')
            flow_setup_limit = attrs.get('flow_setup_limit')
            # NOTE(jetlee): now, we get the network info, then create the db.
            network = self.get_network(context, port['port']['network_id'])
            if network['router:external']:
                external_net_flag = True
            else:
                external_net_flag = False
            context.external_net_flag = external_net_flag
            port_db = self.create_port_db(context, port)
            result = self._make_port_dict(port_db, process_extensions=False)
            self.extension_manager.process_create_port(context, attrs, result)
            self._portsec_ext_port_create_processing(context, result, port)

            # sgs must be got after portsec checked with security group
            sgs = self._get_security_groups_on_port(context, port)
            self._process_port_create_security_group(context, result, sgs)
            #network = self.get_network(context, result['network_id'])
            binding = db.add_port_binding(context, 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._process_port_create_flow_limit(context, result,
                                                      flow_limit)
            self._process_port_create_flow_setup_limit(context, result,
                                                      flow_setup_limit)
            kwargs = {'context': context, 'port': result}
            # NOTE(jetlee): it's possible to deliver network and port
            # obj to qos plugin? we try to do it.
            kwargs['network_qos_policy_id'] = network.get('qos_policy_id')
            registry.notify(
                resources.PORT, events.PRECOMMIT_CREATE, self, **kwargs)
            self.mechanism_manager.create_port_precommit(mech_context)
            self._setup_dhcp_agent_provisioning_component(context, result)

        resource_extend.apply_funcs('ports', result, port_db)
        # NOTE(jetlee): return a new param - network
        return result, mech_context, network

    @utils.transaction_guard
    @db_api.retry_if_session_inactive()
    def create_port(self, context, port):
        self._before_create_port(context, port)
        try:
            result, mech_context, network = \
                self._create_port_db(context, port)
        finally:
            # NOTE(jetlee): now we must release the lock, whether the
            # create_port_db is success.
            if cfg.CONF.tooz.enabled and cfg.CONF.tooz.ip_lock and \
                    cfg.CONF.tooz.release_lock:
                # NOTE(zhaimengdong): If ip address was configured, context
                # will not have lock_dict, so we should determine whether the
                # context has lock_dict before release tooz lock
                if hasattr(context, 'lock_dict'):
                    lockName = context.lock_dict[context.request_id]
                    dist_lock.release_tooz_lock(lockName)
        # NOTE(jetlee): add a network to the after method
        return self._after_create_port(context, result, mech_context, network)

    def _after_create_port(self, context, result, mech_context, network=None):
        # notify any plugin that is interested in port create events
        kwargs = {'context': context, 'port': result}
        # NOTE(jetlee): deliver the network info to the 'after method'
        if network:
            kwargs['network'] = network
        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("mechanism_manager.create_port_postcommit "
                          "failed, deleting port '%s'", result['id'])
                self.delete_port(context, result['id'], l3_port_check=False)
        try:
            bound_context = self._bind_port_if_needed(mech_context)
        except ml2_exc.MechanismDriverError:
            with excutils.save_and_reraise_exception():
                LOG.error("_bind_port_if_needed "
                          "failed, deleting port '%s'", result['id'])
                self.delete_port(context, result['id'], l3_port_check=False)

        return bound_context.current

    @utils.transaction_guard
    @db_api.retry_if_session_inactive()
    def create_port_bulk(self, context, ports):
        objects = self._create_bulk_ml2(port_def.RESOURCE_NAME, context, ports)
        return [obj['result'] for obj in objects]

    # TODO(yalei) - will be simplified after security group and address pair be
    # converted to ext driver too.
    def _portsec_ext_port_update_processing(self, updated_port, context, port,
                                            id):
        port_security = ((updated_port.get(psec.PORTSECURITY) is None) or
                         updated_port[psec.PORTSECURITY])

        if port_security:
            return

        # check the address-pairs
        if self._check_update_has_allowed_address_pairs(port):
            #  has address pairs in request
            raise addr_pair.AddressPairAndPortSecurityRequired()
        elif (not
         self._check_update_deletes_allowed_address_pairs(port)):
            # not a request for deleting the address-pairs
            updated_port[addr_pair.ADDRESS_PAIRS] = (
                    self.get_allowed_address_pairs(context, id))

            # check if address pairs has been in db, if address pairs could
            # be put in extension driver, we can refine here.
            if updated_port[addr_pair.ADDRESS_PAIRS]:
                raise addr_pair.AddressPairAndPortSecurityRequired()

        # checks if security groups were updated adding/modifying
        # security groups, port security is set
        if self._check_update_has_security_groups(port):
            raise psec_exc.PortSecurityAndIPRequiredForSecurityGroups()
        elif (not
          self._check_update_deletes_security_groups(port)):
            if not utils.is_extension_supported(self, 'security-group'):
                return
            # Update did not have security groups passed in. Check
            # that port does not have any security groups already on it.
            filters = {'port_id': [id]}
            security_groups = (
                super(Ml2Plugin, self)._get_port_security_group_bindings(
                        context, filters)
                     )
            if security_groups:
                raise psec_exc.PortSecurityPortHasSecurityGroup()

    @staticmethod
    def _add_port_security_enabled_attr(attrs, original_port):
        # Add 'port_security_enabled=True' to attrs for cloudos demands when
        # booting or updating instance ports with no security groups by
        # default.
        # The logic listed as follows:
        #   1. update port with sg, then update port_security_enabled to True
        #   2. remove port sg, then update port_security_enabled to False
        if 'security_groups' in attrs:
            if not attrs['security_groups'] and \
                    original_port['port_security_enabled']:
                # To allow all packets in/out from port
                attrs['port_security_enabled'] = False
            else:
                attrs['port_security_enabled'] = True

    @utils.transaction_guard
    @db_api.retry_if_session_inactive()
    def update_port(self, context, id, port):
        attrs = port[port_def.RESOURCE_NAME]
        need_port_update_notify = False
        bound_mech_contexts = []
        original_port = self.get_port(context, id)
        if cfg.CONF.SECURITYGROUP.allow_all_traffic_with_no_security_groups:
            self._add_port_security_enabled_attr(attrs, original_port)
        registry.notify(resources.PORT, events.BEFORE_UPDATE, self,
                        context=context, port=attrs,
                        original_port=original_port)
        with db_api.context_manager.writer.using(context):
            port_db = self._get_port(context, id)
            binding = port_db.port_binding
            if not binding:
                raise exc.PortNotFound(port_id=id)
            mac_address_updated = self._check_mac_update_allowed(
                port_db, attrs, 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)
            self._portsec_ext_port_update_processing(updated_port, context,
                                                     port, id)

            if (psec.PORTSECURITY in attrs) and (
                        original_port[psec.PORTSECURITY] !=
                        updated_port[psec.PORTSECURITY]):
                need_port_update_notify = True
            # TODO(QoS): Move out to the extension framework somehow.
            # Follow https://review.openstack.org/#/c/169223 for a solution.
            if (qos_consts.QOS_POLICY_ID in attrs and
                    original_port[qos_consts.QOS_POLICY_ID] !=
                    updated_port[qos_consts.QOS_POLICY_ID]):
                need_port_update_notify = True
                if self.qos_checker and \
                        const.DEVICE_OWNER_COMPUTE_PREFIX in \
                        original_port.get('device_owner') and \
                    original_port.get('status') == \
                        const.PORT_STATUS_ACTIVE:
                    self._qos_check(context,
                                    original_port[qos_consts.QOS_POLICY_ID],
                                    updated_port[qos_consts.QOS_POLICY_ID],
                                    port=original_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)
            need_port_update_notify |= self._update_flow_limit_on_port(
                context, id, port, updated_port)
            need_port_update_notify |= self._update_flow_setup_limit_on_port(
                context, id, port, updated_port)
            levels = db.get_binding_levels(context, id, binding.host)
            # one of the operations above may have altered the model call
            # _make_port_dict again to ensure latest state is reflected so mech
            # drivers, callback handlers, and the API caller see latest state.
            # We expire here to reflect changed relationships on the obj.
            # Repeatable read will ensure we still get the state from this
            # transaction in spite of concurrent updates/deletes.
            context.session.expire(port_db)
            updated_port.update(self._make_port_dict(port_db))
            mech_context = driver_context.PortContext(

posted @ 2022-11-07 17:31 fazzer 阅读(175) 评论(0) 收藏举报

刷新页面返回顶部

neutron核心资源拓展开发

公告