# -*- encoding: utf-8 -*-
#
# Copyright 2013 Hewlett-Packard Development Company, L.P.
#
# 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.
"""
Base classes for storage engines
"""

import abc

from oslo_config import cfg
from oslo_db import api as db_api


_BACKEND_MAPPING = {'sqlalchemy': 'ironic.db.sqlalchemy.api'}
IMPL = db_api.DBAPI.from_config(cfg.CONF, backend_mapping=_BACKEND_MAPPING,
                                lazy=True)


def get_instance():
    """Return a DB API instance."""
    return IMPL


class Connection(object, metaclass=abc.ABCMeta):
    """Base class for storage system connections."""

    @abc.abstractmethod
    def __init__(self):
        """Constructor."""

    @abc.abstractmethod
    def get_nodeinfo_list(self, columns=None, filters=None, limit=None,
                          marker=None, sort_key=None, sort_dir=None):
        """Get specific columns for matching nodes.

        Return a list of the specified columns for all nodes that match the
        specified filters.

        :param columns: List of column names to return.
                        Defaults to 'id' column when columns == None.
        :param filters: Filters to apply. Defaults to None.

                        :associated: True | False
                        :chassis_uuid: uuid of chassis
                        :conductor_group: conductor group name
                        :console_enabled: True | False
                        :description_contains: substring in description
                        :driver: driver's name
                        :fault: current fault type
                        :id: numeric ID
                        :inspection_started_before:
                            nodes with inspection_started_at field before this
                            interval in seconds
                        :instance_uuid: uuid of instance
                        :lessee: node's lessee (e.g. project ID)
                        :maintenance: True | False
                        :owner: node's owner (e.g. project ID)
                        :project: either owner or lessee
                        :reserved: True | False
                        :reserved_by_any_of: [conductor1, conductor2]
                        :resource_class: resource class name
                        :retired: True | False
                        :shard_in: shard (multiple possibilities)
                        :provision_state: provision state of node
                        :provision_state_in:
                            provision state of node (multiple possibilities)
                        :provisioned_before:
                            nodes with provision_updated_at field before this
                            interval in seconds
                        :uuid: uuid of node
                        :uuid_in: uuid of node (multiple possibilities)
                        :with_power_state: True | False
        :param limit: Maximum number of nodes to return.
        :param marker: the last item of the previous page; we return the next
                       result set.
        :param sort_key: Attribute by which results should be sorted.
        :param sort_dir: direction in which results should be sorted.
                         (asc, desc)
        :returns: A list of tuples of the specified columns.
        """

    @abc.abstractmethod
    def get_node_list(self, filters=None, limit=None, marker=None,
                      sort_key=None, sort_dir=None, fields=None):
        """Return a list of nodes.

        :param filters: Filters to apply. Defaults to None.

                        :associated: True | False
                        :reserved: True | False
                        :maintenance: True | False
                        :chassis_uuid: uuid of chassis
                        :driver: driver's name
                        :provision_state: provision state of node
                        :provisioned_before:
                            nodes with provision_updated_at field before this
                            interval in seconds
                        :shard: nodes with the given shard
        :param limit: Maximum number of nodes to return.
        :param marker: the last item of the previous page; we return the next
                       result set.
        :param sort_key: Attribute by which results should be sorted.
        :param sort_dir: direction in which results should be sorted.
                         (asc, desc)
        :param fields: Comma separated field list to return, to allow for
                       only specific fields to be returned to have maximum
                       API performance calls where not all columns are
                       needed from the database.
        """

    @abc.abstractmethod
    def check_node_list(self, idents):
        """Check a list of node identities and map it to UUIDs.

        This call takes a list of node names and/or UUIDs and tries to convert
        them to UUIDs. It fails early if any identities cannot possible be used
        as names or UUIDs.

        :param idents: List of identities.
        :returns: A mapping from requests identities to node UUIDs.
        :raises: NodeNotFound if some identities were not found or cannot be
            valid names or UUIDs.
        """

    @abc.abstractmethod
    def reserve_node(self, tag, node_id):
        """Reserve a node.

        To prevent other ManagerServices from manipulating the given
        Node while a Task is performed, mark it reserved by this host.

        :param tag: A string uniquely identifying the reservation holder.
        :param node_id: A node id or uuid.
        :returns: A Node object.
        :raises: NodeNotFound if the node is not found.
        :raises: NodeLocked if the node is already reserved.
        """

    @abc.abstractmethod
    def release_node(self, tag, node_id):
        """Release the reservation on a node.

        :param tag: A string uniquely identifying the reservation holder.
        :param node_id: A node id or uuid.
        :raises: NodeNotFound if the node is not found.
        :raises: NodeLocked if the node is reserved by another host.
        :raises: NodeNotLocked if the node was found to not have a
                 reservation at all.
        """

    @abc.abstractmethod
    def create_node(self, values):
        """Create a new node.

        :param values: A dict containing several items used to identify
                       and track the node, and several dicts which are passed
                       into the Drivers when managing this node. For example:

                       ::

                        {
                         'uuid': uuidutils.generate_uuid(),
                         'instance_uuid': None,
                         'power_state': states.POWER_OFF,
                         'provision_state': states.AVAILABLE,
                         'driver': 'ipmi',
                         'driver_info': { ... },
                         'properties': { ... },
                         'extra': { ... },
                        }
        :raises: InvalidParameterValue if 'values' contains 'tags' or 'traits'.
        :returns: A node.
        """

    @abc.abstractmethod
    def get_node_by_id(self, node_id):
        """Return a node.

        :param node_id: The id of a node.
        :returns: A node.
        """

    @abc.abstractmethod
    def get_node_by_uuid(self, node_uuid):
        """Return a node.

        :param node_uuid: The uuid of a node.
        :returns: A node.
        """

    @abc.abstractmethod
    def get_node_by_name(self, node_name):
        """Return a node.

        :param node_name: The logical name of a node.
        :returns: A node.
        """

    @abc.abstractmethod
    def get_node_by_instance(self, instance):
        """Return a node.

        :param instance: The instance uuid to search for.
        :returns: A node.
        :raises: InstanceNotFound if the instance is not found.
        :raises: InvalidUUID if the instance uuid is invalid.
        """

    @abc.abstractmethod
    def destroy_node(self, node_id):
        """Destroy a node and its associated resources.

        Destroy a node, including any associated ports, port groups,
        tags, traits, volume connectors, and volume targets.

        :param node_id: The ID or UUID of a node.
        """

    @abc.abstractmethod
    def update_node(self, node_id, values):
        """Update properties of a node.

        :param node_id: The id or uuid of a node.
        :param values: Dict of values to update.
                       May be a partial list, eg. when setting the
                       properties for a driver. For example:

                       ::

                        {
                         'driver_info':
                             {
                              'my-field-1': val1,
                              'my-field-2': val2,
                             }
                        }
        :returns: A node.
        :raises: NodeAssociated
        :raises: NodeNotFound
        """

    @abc.abstractmethod
    def get_port_by_id(self, port_id):
        """Return a network port representation.

        :param port_id: The id of a port.
        :returns: A port.
        """

    @abc.abstractmethod
    def get_port_by_uuid(self, port_uuid):
        """Return a network port representation.

        :param port_uuid: The uuid of a port.
        :returns: A port.
        """

    @abc.abstractmethod
    def get_port_by_address(self, address):
        """Return a network port representation.

        :param address: The MAC address of a port.
        :returns: A port.
        """

    @abc.abstractmethod
    def get_port_by_name(self, port_name):
        """Return a network port representation.

        :param port_name: The name of a port.
        :returns: A port.
        """

    @abc.abstractmethod
    def get_port_list(self, limit=None, marker=None,
                      sort_key=None, sort_dir=None):
        """Return a list of ports.

        :param limit: Maximum number of ports to return.
        :param marker: the last item of the previous page; we return the next
                       result set.
        :param sort_key: Attribute by which results should be sorted.
        :param sort_dir: direction in which results should be sorted.
                         (asc, desc)
        """

    @abc.abstractmethod
    def get_ports_by_shards(self, shards, limit=None, marker=None,
                            sort_key=None, sort_dir=None):
        """Return a list of ports contained in the provided shards.

        :param shard_ids: A list of shards to filter ports by.
        """

    @abc.abstractmethod
    def get_ports_by_node_id(self, node_id, limit=None, marker=None,
                             sort_key=None, sort_dir=None):
        """List all the ports for a given node.

        :param node_id: The integer node ID.
        :param limit: Maximum number of ports to return.
        :param marker: the last item of the previous page; we return the next
                       result set.
        :param sort_key: Attribute by which results should be sorted
        :param sort_dir: direction in which results should be sorted
                         (asc, desc)
        :returns: A list of ports.
        """

    @abc.abstractmethod
    def get_ports_by_portgroup_id(self, portgroup_id, limit=None, marker=None,
                                  sort_key=None, sort_dir=None):
        """List all the ports for a given portgroup.

        :param portgroup_id: The integer portgroup ID.
        :param limit: Maximum number of ports to return.
        :param marker: The last item of the previous page; we return the next
                       result set.
        :param sort_key: Attribute by which results should be sorted
        :param sort_dir: Direction in which results should be sorted
                         (asc, desc)
        :returns: A list of ports.
        """

    @abc.abstractmethod
    def create_port(self, values):
        """Create a new port.

        :param values: Dict of values.
        """

    @abc.abstractmethod
    def update_port(self, port_id, values):
        """Update properties of an port.

        :param port_id: The id or MAC of a port.
        :param values: Dict of values to update.
        :returns: A port.
        """

    @abc.abstractmethod
    def destroy_port(self, port_id):
        """Destroy an port.

        :param port_id: The id or MAC of a port.
        """

    @abc.abstractmethod
    def get_portgroup_by_id(self, portgroup_id):
        """Return a network portgroup representation.

        :param portgroup_id: The id of a portgroup.
        :returns: A portgroup.
        :raises: PortgroupNotFound
        """

    @abc.abstractmethod
    def get_portgroup_by_uuid(self, portgroup_uuid):
        """Return a network portgroup representation.

        :param portgroup_uuid: The uuid of a portgroup.
        :returns: A portgroup.
        :raises: PortgroupNotFound
        """

    @abc.abstractmethod
    def get_portgroup_by_address(self, address, project=None):
        """Return a network portgroup representation.

        :param address: The MAC address of a portgroup.
        :param project: A node owner or lessee to filter by.
        :returns: A portgroup.
        :raises: PortgroupNotFound
        """

    @abc.abstractmethod
    def get_portgroup_by_name(self, name):
        """Return a network portgroup representation.

        :param name: The logical name of a portgroup.
        :returns: A portgroup.
        :raises: PortgroupNotFound
        """

    @abc.abstractmethod
    def get_portgroup_list(self, limit=None, marker=None,
                           sort_key=None, sort_dir=None,
                           project=None):
        """Return a list of portgroups.

        :param limit: Maximum number of portgroups to return.
        :param marker: The last item of the previous page; we return the next
                       result set.
        :param sort_key: Attribute by which results should be sorted.
        :param sort_dir: Direction in which results should be sorted.
                         (asc, desc)
        :param project: A node owner or lessee to filter by.
        :returns: A list of portgroups.
        """

    @abc.abstractmethod
    def get_portgroups_by_node_id(self, node_id, limit=None, marker=None,
                                  sort_key=None, sort_dir=None,
                                  project=None):
        """List all the portgroups for a given node.

        :param node_id: The integer node ID.
        :param limit: Maximum number of portgroups to return.
        :param marker: The last item of the previous page; we return the next
                       result set.
        :param sort_key: Attribute by which results should be sorted
        :param sort_dir: Direction in which results should be sorted
                         (asc, desc)
        :param project: A node owner or lessee to filter by.
        :returns: A list of portgroups.
        """

    @abc.abstractmethod
    def create_portgroup(self, values):
        """Create a new portgroup.

        :param values: Dict of values with the following keys:
                       'id'
                       'uuid'
                       'name'
                       'node_id'
                       'address'
                       'extra'
                       'created_at'
                       'updated_at'
        :returns: A portgroup
        :raises: PortgroupDuplicateName
        :raises: PortgroupMACAlreadyExists
        :raises: PortgroupAlreadyExists
        """

    @abc.abstractmethod
    def update_portgroup(self, portgroup_id, values):
        """Update properties of a portgroup.

        :param portgroup_id: The UUID or MAC of a portgroup.
        :param values: Dict of values to update.
                       May contain the following keys:
                       'uuid'
                       'name'
                       'node_id'
                       'address'
                       'extra'
                       'created_at'
                       'updated_at'
        :returns: A portgroup.
        :raises: InvalidParameterValue
        :raises: PortgroupNotFound
        :raises: PortgroupDuplicateName
        :raises: PortgroupMACAlreadyExists
        """

    @abc.abstractmethod
    def destroy_portgroup(self, portgroup_id):
        """Destroy a portgroup.

        :param portgroup_id: The UUID or MAC of a portgroup.
        :raises: PortgroupNotEmpty
        :raises: PortgroupNotFound
        """

    @abc.abstractmethod
    def create_chassis(self, values):
        """Create a new chassis.

        :param values: Dict of values.
        """

    @abc.abstractmethod
    def get_chassis_by_id(self, chassis_id):
        """Return a chassis representation.

        :param chassis_id: The id of a chassis.
        :returns: A chassis.
        """

    @abc.abstractmethod
    def get_chassis_by_uuid(self, chassis_uuid):
        """Return a chassis representation.

        :param chassis_uuid: The uuid of a chassis.
        :returns: A chassis.
        """

    @abc.abstractmethod
    def get_chassis_list(self, limit=None, marker=None,
                         sort_key=None, sort_dir=None):
        """Return a list of chassis.

        :param limit: Maximum number of chassis to return.
        :param marker: the last item of the previous page; we return the next
                       result set.
        :param sort_key: Attribute by which results should be sorted.
        :param sort_dir: direction in which results should be sorted.
                         (asc, desc)
        """

    @abc.abstractmethod
    def update_chassis(self, chassis_id, values):
        """Update properties of an chassis.

        :param chassis_id: The id or the uuid of a chassis.
        :param values: Dict of values to update.
        :returns: A chassis.
        """

    @abc.abstractmethod
    def destroy_chassis(self, chassis_id):
        """Destroy a chassis.

        :param chassis_id: The id or the uuid of a chassis.
        """

    @abc.abstractmethod
    def register_conductor(self, values, update_existing=False):
        """Register an active conductor with the cluster.

        :param values: A dict of values which must contain the following:

                       ::

                        {
                         'hostname': the unique hostname which identifies
                                     this Conductor service.
                         'drivers': a list of supported drivers.
                         'version': the version of the object.Conductor
                        }
        :param update_existing: When false, registration will raise an
                                exception when a conflicting online record
                                is found. When true, will overwrite the
                                existing record. Default: False.
        :returns: A conductor.
        :raises: ConductorAlreadyRegistered
        """

    @abc.abstractmethod
    def get_conductor_list(self, limit=None, marker=None,
                           sort_key=None, sort_dir=None):
        """Return a list of conductors.

        :param limit: Maximum number of conductors to return.
        :param marker: the last item of the previous page; we return the next
                       result set.
        :param sort_key: Attribute by which results should be sorted.
        :param sort_dir: direction in which results should be sorted.
                         (asc, desc)
        """

    @abc.abstractmethod
    def get_conductor(self, hostname, online=True):
        """Retrieve a conductor's service record from the database.

        :param hostname: The hostname of the conductor service.
        :param online: Specify the filter value on the `online` field when
                       querying conductors. The ``online`` field is ignored if
                       this value is set to None.
        :returns: A conductor.
        :raises: ConductorNotFound if the conductor with given hostname does
                 not exist or doesn't meet the specified online expectation.
        """

    @abc.abstractmethod
    def unregister_conductor(self, hostname):
        """Remove this conductor from the service registry immediately.

        :param hostname: The hostname of this conductor service.
        :raises: ConductorNotFound
        """

    @abc.abstractmethod
    def touch_conductor(self, hostname, online=True):
        """Mark a conductor as active by updating its 'updated_at' property.

        Calling periodically with ``online=False`` will result in the conductor
        appearing unregistered, but recently enough to prevent other conductors
        failing orphan nodes. This improves the behaviour of graceful and drain
        shutdown.

        :param hostname: The hostname of this conductor service.
        :param online: Whether the conductor is online.
        :raises: ConductorNotFound
        """

    @abc.abstractmethod
    def get_active_hardware_type_dict(self, use_groups=False):
        """Retrieve hardware types for the registered and active conductors.

        :param use_groups: Whether to factor conductor_group into the keys.
        :returns: A dict which maps hardware type names to the set of hosts
                  which support them. For example:

                  ::

                    {hardware-type-a: set([host1, host2]),
                     hardware-type-b: set([host2, host3])}
        """

    @abc.abstractmethod
    def get_offline_conductors(self, field='hostname'):
        """Get a list conductors that are offline (dead).

        :param field: A field to return, hostname by default.
        :returns: A list of requested fields of offline conductors.
        """

    @abc.abstractmethod
    def get_online_conductors(self):
        """Get a list conductor hostnames that are online and active.

        :returns: A list of conductor hostnames.
        """

    @abc.abstractmethod
    def list_conductor_hardware_interfaces(self, conductor_id):
        """List all registered hardware interfaces for a conductor.

        :param conductor_id: Database ID of conductor.
        :returns: List of ``ConductorHardwareInterfaces`` objects.
        """

    @abc.abstractmethod
    def list_hardware_type_interfaces(self, hardware_types):
        """List registered hardware interfaces for given hardware types.

        This is restricted to only active conductors.
        :param hardware_types: list of hardware types to filter by.
        :returns: list of ``ConductorHardwareInterfaces`` objects.
        """

    @abc.abstractmethod
    def register_conductor_hardware_interfaces(self, conductor_id,
                                               hardware_type, interface_type,
                                               interfaces, default_interface):
        """Registers hardware interfaces for a conductor.

        :param conductor_id: Database ID of conductor to register for.
        :param hardware_type: Name of hardware type for the interfaces.
        :param interface_type: Type of interfaces, e.g. 'deploy' or 'boot'.
        :param interfaces: List of interface names to register.
        :param default_interface: String, the default interface for this
                                  hardware type and interface type.
        :raises: ConductorHardwareInterfacesAlreadyRegistered if at least one
                 of the interfaces in the combination of all parameters is
                 already registered.
        """

    @abc.abstractmethod
    def unregister_conductor_hardware_interfaces(self, conductor_id):
        """Unregisters all hardware interfaces for a conductor.

        :param conductor_id: Database ID of conductor to unregister for.
        """

    @abc.abstractmethod
    def touch_node_provisioning(self, node_id):
        """Mark the node's provisioning as running.

        Mark the node's provisioning as running by updating its
        'provision_updated_at' property.

        :param node_id: The id of a node.
        :raises: NodeNotFound
        """

    @abc.abstractmethod
    def set_node_tags(self, node_id, tags):
        """Replace all of the node tags with specified list of tags.

        This ignores duplicate tags in the specified list.

        :param node_id: The id of a node.
        :param tags: List of tags.
        :returns: A list of NodeTag objects.
        :raises: NodeNotFound if the node is not found.
        """

    @abc.abstractmethod
    def unset_node_tags(self, node_id):
        """Remove all tags of the node.

        :param node_id: The id of a node.
        :raises: NodeNotFound if the node is not found.
        """

    @abc.abstractmethod
    def get_node_tags_by_node_id(self, node_id):
        """Get node tags based on its id.

        :param node_id: The id of a node.
        :returns: A list of NodeTag objects.
        :raises: NodeNotFound if the node is not found.
        """

    @abc.abstractmethod
    def add_node_tag(self, node_id, tag):
        """Add tag to the node.

        If the node_id and tag pair already exists, this should still
        succeed.

        :param node_id: The id of a node.
        :param tag: A tag string.
        :returns: the NodeTag object.
        :raises: NodeNotFound if the node is not found.
        """

    @abc.abstractmethod
    def delete_node_tag(self, node_id, tag):
        """Delete specified tag from the node.

        :param node_id: The id of a node.
        :param tag: A tag string.
        :raises: NodeNotFound if the node is not found.
        :raises: NodeTagNotFound if the tag is not found.
        """

    @abc.abstractmethod
    def node_tag_exists(self, node_id, tag):
        """Check if the specified tag exist on the node.

        :param node_id: The id of a node.
        :param tag: A tag string.
        :returns: True if the tag exists otherwise False.
        :raises: NodeNotFound if the node is not found.
        """

    @abc.abstractmethod
    def get_node_by_port_addresses(self, addresses):
        """Find a node by any matching port address.

        :param addresses: list of port addresses (e.g. MACs).
        :returns: Node object.
        :raises: NodeNotFound if none or several nodes are found.
        """

    @abc.abstractmethod
    def get_volume_connector_list(self, limit=None, marker=None,
                                  sort_key=None, sort_dir=None,
                                  project=None):
        """Return a list of volume connectors.

        :param limit: Maximum number of volume connectors to return.
        :param marker: The last item of the previous page; we return the next
                       result set.
        :param sort_key: Attribute by which results should be sorted.
        :param sort_dir: Direction in which results should be sorted.
                         (asc, desc)
        :param project: The associated node project to search with.
        :returns: a list of :class:`VolumeConnector` objects
        :returns: A list of volume connectors.
        :raises: InvalidParameterValue If sort_key does not exist.
        """

    @abc.abstractmethod
    def get_volume_connector_by_id(self, db_id):
        """Return a volume connector representation.

        :param db_id: The integer database ID of a volume connector.
        :returns: A volume connector with the specified ID.
        :raises: VolumeConnectorNotFound If a volume connector
                 with the specified ID is not found.
        """

    @abc.abstractmethod
    def get_volume_connector_by_uuid(self, connector_uuid):
        """Return a volume connector representation.

        :param connector_uuid: The UUID of a connector.
        :returns: A volume connector with the specified UUID.
        :raises: VolumeConnectorNotFound If a volume connector
                 with the specified UUID is not found.
        """

    @abc.abstractmethod
    def get_volume_connectors_by_node_id(self, node_id, limit=None,
                                         marker=None, sort_key=None,
                                         sort_dir=None, project=None):
        """List all the volume connectors for a given node.

        :param node_id: The integer node ID.
        :param limit: Maximum number of volume connectors to return.
        :param marker: The last item of the previous page; we return the next
                       result set.
        :param sort_key: Attribute by which results should be sorted
        :param sort_dir: Direction in which results should be sorted
                         (asc, desc)
        :param project: The associated node project to search with.
        :returns: a list of :class:`VolumeConnector` objects
        :returns: A list of volume connectors.
        :raises: InvalidParameterValue If sort_key does not exist.
        """

    @abc.abstractmethod
    def create_volume_connector(self, connector_info):
        """Create a new volume connector.

        :param connector_info: Dictionary containing information about the
                               connector. Example::

                                   {
                                       'uuid': '000000-..',
                                       'type': 'wwnn',
                                       'connector_id': '00:01:02:03:04:05:06',
                                       'node_id': 2
                                   }

        :returns: A volume connector.
        :raises: VolumeConnectorTypeAndIdAlreadyExists If a connector
                 already exists with a matching type and connector_id.
        :raises: VolumeConnectorAlreadyExists If a volume connector with
                 the same UUID already exists.
        """

    @abc.abstractmethod
    def update_volume_connector(self, ident, connector_info):
        """Update properties of a volume connector.

        :param ident: The UUID or integer ID of a volume connector.
        :param connector_info: Dictionary containing the information about
                               connector to update.
        :returns: A volume connector.
        :raises: VolumeConnectorTypeAndIdAlreadyExists If another
                 connector already exists with a matching type and
                 connector_id field.
        :raises: VolumeConnectorNotFound If a volume connector
                 with the specified ident does not exist.
        :raises: InvalidParameterValue When a UUID is included in
                 connector_info.
        """

    @abc.abstractmethod
    def destroy_volume_connector(self, ident):
        """Destroy a volume connector.

        :param ident: The UUID or integer ID of a volume connector.
        :raises: VolumeConnectorNotFound If a volume connector
                 with the specified ident does not exist.
        """

    @abc.abstractmethod
    def get_volume_target_list(self, limit=None, marker=None,
                               sort_key=None, sort_dir=None,
                               project=None):
        """Return a list of volume targets.

        :param limit: Maximum number of volume targets to return.
        :param marker: the last item of the previous page; we return the next
                       result set.
        :param sort_key: Attribute by which results should be sorted.
        :param sort_dir: direction in which results should be sorted.
                         (asc, desc)
        :param project: The associated node project to search with.
        :returns: a list of :class:`VolumeConnector` objects
        :returns: A list of volume targets.
        :raises: InvalidParameterValue if sort_key does not exist.
        """

    @abc.abstractmethod
    def get_volume_target_by_id(self, db_id):
        """Return a volume target representation.

        :param db_id: The database primary key (integer) ID of a volume target.
        :returns: A volume target.
        :raises: VolumeTargetNotFound if no volume target with this ID
                 exists.
        """

    @abc.abstractmethod
    def get_volume_target_by_uuid(self, uuid):
        """Return a volume target representation.

        :param uuid: The UUID of a volume target.
        :returns: A volume target.
        :raises: VolumeTargetNotFound if no volume target with this UUID
                 exists.
        """

    @abc.abstractmethod
    def get_volume_targets_by_node_id(self, node_id, limit=None,
                                      marker=None, sort_key=None,
                                      sort_dir=None, project=None):
        """List all the volume targets for a given node.

        :param node_id: The integer node ID.
        :param limit: Maximum number of volume targets to return.
        :param marker: the last item of the previous page; we return the next
                       result set.
        :param sort_key: Attribute by which results should be sorted
        :param sort_dir: direction in which results should be sorted
                         (asc, desc)
        :param project: The associated node project to search with.
        :returns: a list of :class:`VolumeConnector` objects
        :returns: A list of volume targets.
        :raises: InvalidParameterValue if sort_key does not exist.
        """

    @abc.abstractmethod
    def get_volume_targets_by_volume_id(self, volume_id, limit=None,
                                        marker=None, sort_key=None,
                                        sort_dir=None, project=None):
        """List all the volume targets for a given volume id.

        :param volume_id: The UUID of the volume.
        :param limit: Maximum number of volume targets to return.
        :param marker: the last item of the previous page; we return the next
                       result set.
        :param sort_key: Attribute by which results should be sorted
        :param sort_dir: direction in which results should be sorted
                         (asc, desc)
        :returns: A list of volume targets.
        :raises: InvalidParameterValue if sort_key does not exist.
        """

    @abc.abstractmethod
    def create_volume_target(self, target_info):
        """Create a new volume target.

        :param target_info: Dictionary containing the information about the
                            volume target. Example::

                                   {
                                       'uuid': '000000-..',
                                       'node_id': 2,
                                       'boot_index': 0,
                                       'volume_id': '12345678-...'
                                       'volume_type': 'some type',
                                   }
        :returns: A volume target.
        :raises: VolumeTargetBootIndexAlreadyExists if a volume target already
                 exists with the same boot index and node ID.
        :raises: VolumeTargetAlreadyExists if a volume target with the same
                 UUID exists.
        """

    @abc.abstractmethod
    def update_volume_target(self, ident, target_info):
        """Update information for a volume target.

        :param ident: The UUID or integer ID of a volume target.
        :param target_info: Dictionary containing the information about
                            volume target to update.
        :returns: A volume target.
        :raises: InvalidParameterValue if a UUID is included in target_info.
        :raises: VolumeTargetBootIndexAlreadyExists if a volume target already
                 exists with the same boot index and node ID.
        :raises: VolumeTargetNotFound if no volume target with this ident
                 exists.
        """

    @abc.abstractmethod
    def destroy_volume_target(self, ident):
        """Destroy a volume target.

        :param ident: The UUID or integer ID of a volume target.
        :raises: VolumeTargetNotFound if a volume target with the specified
                 ident does not exist.
        """

    @abc.abstractmethod
    def check_versions(self, ignore_models=()):
        """Checks the whole database for incompatible objects.

        This scans all the tables in search of objects that are not supported;
        i.e., those that are not specified in
        `ironic.common.release_mappings.RELEASE_MAPPING`.

        :param ignore_models: List of model names to skip.
        :returns: A Boolean. True if all the objects have supported versions;
                  False otherwise.
        """

    @abc.abstractmethod
    def update_to_latest_versions(self, context, max_count):
        """Updates objects to their latest known versions.

        This scans all the tables and for objects that are not in their latest
        version, updates them to that version.

        :param context: the admin context
        :param max_count: The maximum number of objects to migrate. Must be
                          >= 0. If zero, all the objects will be migrated.
        :returns: A 2-tuple, 1. the total number of objects that need to be
                  migrated (at the beginning of this call) and 2. the number
                  of migrated objects.
        """

    @abc.abstractmethod
    def set_node_traits(self, node_id, traits, version):
        """Replace all of the node traits with specified list of traits.

        This ignores duplicate traits in the specified list.

        :param node_id: The id of a node.
        :param traits: List of traits.
        :param version: the version of the object.Trait.
        :returns: A list of NodeTrait objects.
        :raises: InvalidParameterValue if setting the traits would exceed the
            per-node traits limit.
        :raises: NodeNotFound if the node is not found.
        """

    @abc.abstractmethod
    def unset_node_traits(self, node_id):
        """Remove all traits of the node.

        :param node_id: The id of a node.
        :raises: NodeNotFound if the node is not found.
        """

    @abc.abstractmethod
    def get_node_traits_by_node_id(self, node_id):
        """Get node traits based on its id.

        :param node_id: The id of a node.
        :returns: A list of NodeTrait objects.
        :raises: NodeNotFound if the node is not found.
        """

    @abc.abstractmethod
    def add_node_trait(self, node_id, trait, version):
        """Add trait to the node.

        If the node_id and trait pair already exists, this should still
        succeed.

        :param node_id: The id of a node.
        :param trait: A trait string.
        :param version: the version of the object.Trait.
        :returns: the NodeTrait object.
        :raises: InvalidParameterValue if adding the trait would exceed the
            per-node traits limit.
        :raises: NodeNotFound if the node is not found.
        """

    @abc.abstractmethod
    def delete_node_trait(self, node_id, trait):
        """Delete specified trait from the node.

        :param node_id: The id of a node.
        :param trait: A trait string.
        :raises: NodeNotFound if the node is not found.
        :raises: NodeTraitNotFound if the trait is not found.
        """

    @abc.abstractmethod
    def node_trait_exists(self, node_id, trait):
        """Check if the specified trait exists on the node.

        :param node_id: The id of a node.
        :param trait: A trait string.
        :returns: True if the trait exists otherwise False.
        :raises: NodeNotFound if the node is not found.
        """

    @abc.abstractmethod
    def create_bios_setting_list(self, node_id, settings, version):
        """Create a list of BIOSSetting records for a given node.

        :param node_id: The node id.
        :param settings: A list of BIOS Settings to be created.

                       ::

                        [
                          {
                           'name': String,
                           'value': String,
                           additional settings from BIOS registry
                          },
                          {
                           'name': String,
                           'value': String,
                           additional settings from BIOS registry
                          },
                          ...
                        ]
        :param version: the version of the object.BIOSSetting.
        :returns: A list of BIOSSetting object.
        :raises: NodeNotFound if the node is not found.
        :raises: BIOSSettingAlreadyExists if any of the setting records
            already exists.
        """

    @abc.abstractmethod
    def update_bios_setting_list(self, node_id, settings, version):
        """Update a list of BIOSSetting records.

        :param node_id: The node id.
        :param settings: A list of BIOS Settings to be updated.

                       ::

                        [
                          {
                           'name': String,
                           'value': String,
                           additional settings from BIOS registry
                          },
                          {
                           'name': String,
                           'value': String,
                           additional settings from BIOS registry
                          },
                          ...
                        ]
        :param version: the version of the object.BIOSSetting.
        :returns: A list of BIOSSetting objects.
        :raises: NodeNotFound if the node is not found.
        :raises: BIOSSettingNotFound if any of the settings is not found.
        """

    @abc.abstractmethod
    def delete_bios_setting_list(self, node_id, names):
        """Delete a list of BIOS settings.

        :param node_id: The node id.
        :param names: List of BIOS setting names to be deleted.
        :raises: NodeNotFound if the node is not found.
        :raises: BIOSSettingNotFound if any of BIOS setting name is not found.
        """

    @abc.abstractmethod
    def get_bios_setting(self, node_id, name):
        """Retrieve BIOS setting value.

        :param node_id: The node id.
        :param name: String containing name of BIOS setting to be retrieved.
        :returns: The BIOSSetting object.
        :raises: NodeNotFound if the node is not found.
        :raises: BIOSSettingNotFound if the BIOS setting is not found.
        """

    @abc.abstractmethod
    def get_bios_setting_list(self, node_id):
        """Retrieve BIOS settings of a given node.

        :param node_id: The node id.
        :returns: A list of BIOSSetting objects.
        :raises: NodeNotFound if the node is not found.
        """

    @abc.abstractmethod
    def get_allocation_by_id(self, allocation_id):
        """Return an allocation representation.

        :param allocation_id: The id of an allocation.
        :returns: An allocation.
        :raises: AllocationNotFound
        """

    @abc.abstractmethod
    def get_allocation_by_uuid(self, allocation_uuid):
        """Return an allocation representation.

        :param allocation_uuid: The uuid of an allocation.
        :returns: An allocation.
        :raises: AllocationNotFound
        """

    @abc.abstractmethod
    def get_allocation_by_name(self, name):
        """Return an allocation representation.

        :param name: The logical name of an allocation.
        :returns: An allocation.
        :raises: AllocationNotFound
        """

    @abc.abstractmethod
    def get_allocation_list(self, filters=None, limit=None, marker=None,
                            sort_key=None, sort_dir=None):
        """Return a list of allocations.

        :param filters: Filters to apply. Defaults to None.

                        :node_uuid: uuid of node
                        :state: allocation state
                        :resource_class: requested resource class
        :param limit: Maximum number of allocations to return.
        :param marker: The last item of the previous page; we return the next
                       result set.
        :param sort_key: Attribute by which results should be sorted.
        :param sort_dir: Direction in which results should be sorted.
                         (asc, desc)
        :returns: A list of allocations.
        """

    @abc.abstractmethod
    def create_allocation(self, values):
        """Create a new allocation.

        :param values: Dict of values to create an allocation with
        :returns: An allocation
        :raises: AllocationDuplicateName
        :raises: AllocationAlreadyExists
        """

    @abc.abstractmethod
    def update_allocation(self, allocation_id, values, update_node=True):
        """Update properties of an allocation.

        :param allocation_id: Allocation ID
        :param values: Dict of values to update.
        :param update_node: If True and node_id is updated, update the node
            with instance_uuid and traits from the allocation
        :returns: An allocation.
        :raises: AllocationNotFound
        :raises: AllocationDuplicateName
        :raises: InstanceAssociated
        :raises: NodeAssociated
        """

    @abc.abstractmethod
    def take_over_allocation(self, allocation_id, old_conductor_id,
                             new_conductor_id):
        """Do a take over for an allocation.

        The allocation is only updated if the old conductor matches the
        provided value, thus guarding against races.

        :param allocation_id: Allocation ID
        :param old_conductor_id: The conductor ID we expect to be the current
            ``conductor_affinity`` of the allocation.
        :param new_conductor_id: The conductor ID of the new
            ``conductor_affinity``.
        :returns: True if the take over was successful, False otherwise.
        :raises: AllocationNotFound
        """

    @abc.abstractmethod
    def destroy_allocation(self, allocation_id):
        """Destroy an allocation.

        :param allocation_id: Allocation ID
        :raises: AllocationNotFound
        """

    @abc.abstractmethod
    def create_deploy_template(self, values):
        """Create a deployment template.

        :param values: A dict describing the deployment template. For example:

                     ::

                      {
                       'uuid': uuidutils.generate_uuid(),
                       'name': 'CUSTOM_DT1',
                      }
        :raises: DeployTemplateDuplicateName if a deploy template with the same
            name exists.
        :raises: DeployTemplateAlreadyExists if a deploy template with the same
            UUID exists.
        :returns: A deploy template.
        """

    @abc.abstractmethod
    def update_deploy_template(self, template_id, values):
        """Update a deployment template.

        :param template_id: ID of the deployment template to update.
        :param values: A dict describing the deployment template. For example:

                     ::

                      {
                       'uuid': uuidutils.generate_uuid(),
                       'name': 'CUSTOM_DT1',
                      }
        :raises: DeployTemplateDuplicateName if a deploy template with the same
            name exists.
        :raises: DeployTemplateNotFound if the deploy template does not exist.
        :returns: A deploy template.
        """

    @abc.abstractmethod
    def destroy_deploy_template(self, template_id):
        """Destroy a deployment template.

        :param template_id: ID of the deployment template to destroy.
        :raises: DeployTemplateNotFound if the deploy template does not exist.
        """

    @abc.abstractmethod
    def get_deploy_template_by_id(self, template_id):
        """Retrieve a deployment template by ID.

        :param template_id: ID of the deployment template to retrieve.
        :raises: DeployTemplateNotFound if the deploy template does not exist.
        :returns: A deploy template.
        """

    @abc.abstractmethod
    def get_deploy_template_by_uuid(self, template_uuid):
        """Retrieve a deployment template by UUID.

        :param template_uuid: UUID of the deployment template to retrieve.
        :raises: DeployTemplateNotFound if the deploy template does not exist.
        :returns: A deploy template.
        """

    @abc.abstractmethod
    def get_deploy_template_by_name(self, template_name):
        """Retrieve a deployment template by name.

        :param template_name: name of the deployment template to retrieve.
        :raises: DeployTemplateNotFound if the deploy template does not exist.
        :returns: A deploy template.
        """

    @abc.abstractmethod
    def get_deploy_template_list(self, limit=None, marker=None,
                                 sort_key=None, sort_dir=None):
        """Retrieve a list of deployment templates.

        :param limit: Maximum number of deploy templates to return.
        :param marker: The last item of the previous page; we return the next
                       result set.
        :param sort_key: Attribute by which results should be sorted.
        :param sort_dir: Direction in which results should be sorted.
                         (asc, desc)
        :returns: A list of deploy templates.
        """

    @abc.abstractmethod
    def get_deploy_template_list_by_names(self, names):
        """Return a list of deployment templates with one of a list of names.

        :param names: List of names to filter by.
        :returns: A list of deploy templates.
        """

    @abc.abstractmethod
    def create_node_history(self, values):
        """Create a new history record.

        :param values: Dict of values.
        """

    @abc.abstractmethod
    def destroy_node_history_by_uuid(self, history_uuid):
        """Destroy a history record.

        :param history_uuid: The uuid of a history record
        """

    @abc.abstractmethod
    def get_node_history_by_id(self, history_id):
        """Return a node history representation.

        :param history_id: The id of a history record.
        :returns: A history.
        """

    @abc.abstractmethod
    def get_node_history_by_uuid(self, history_uuid):
        """Return a node history representation.

        :param history_uuid: The uuid of a history record
        :returns: A history.
        """

    @abc.abstractmethod
    def get_node_history_list(self, limit=None, marker=None,
                              sort_key=None, sort_dir=None):
        """Return a list of node history records

        :param limit: Maximum number of history records to return.
        :param marker: the last item of the previous page; we return the next
                       result set.
        :param sort_key: Attribute by which results should be sorted.
        :param sort_dir: direction in which results should be sorted.
                         (asc, desc)
        """

    @abc.abstractmethod
    def get_node_history_by_node_id(self, node_id, limit=None, marker=None,
                                    sort_key=None, sort_dir=None):
        """List all the history records for a given node.

        :param node_id: The integer node ID.
        :param limit: Maximum number of history records to return.
        :param marker: the last item of the previous page; we return the next
                       result set.
        :param sort_key: Attribute by which results should be sorted
        :param sort_dir: direction in which results should be sorted
                         (asc, desc)
        :returns: A list of histories.
        """

    @abc.abstractmethod
    def query_node_history_records_for_purge(self, conductor_id):
        """Utility method to identify nodes to clean history records for.

        :param conductor_id: Id value for the conductor to perform this
                             query on behalf of.
        :returns: A dictionary with key values of node database ID values
                  and a list of values associated with the node.
        """

    @abc.abstractmethod
    def bulk_delete_node_history_records(self, node_id, limit):
        """Utility method to bulk delete node history entries.

        :param entries: A list of node history entry id's to be
                        queried for deletion.
        """

    @abc.abstractmethod
    def count_nodes_in_provision_state(self, state):
        """Count the number of nodes in given provision state.

        :param state: A provision_state value to match for the
                      count operation. This can be a single provision
                      state value or a list of values.
        """

    @abc.abstractmethod
    def create_node_inventory(self, values):
        """Create a new inventory record.

        :param values: Dict of values.
        """

    @abc.abstractmethod
    def destroy_node_inventory_by_node_id(self, inventory_node_id):
        """Destroy a inventory record.

        :param inventory_uuid: The uuid of a inventory record
        """

    @abc.abstractmethod
    def get_node_inventory_by_node_id(self, node_id):
        """Get the node inventory for a given node.

        :param node_id: The integer node ID.
        :returns: An inventory of a node.
        """

    @abc.abstractmethod
    def get_shard_list(self):
        """Retrieve a list of shards.

        :returns: list of dicts containing shard names and count
        """

    @abc.abstractclassmethod
    def create_firmware_component(self, values):
        """Create a FirmwareComponent record for a given node.

        :param values: a dictionary with the necessary information to create
            a FirmwareComponent.

                     ::

                      {
                        'component': String,
                        'initial_version': String,
                        'current_version': String,
                        'last_version_flashed': String
                      }
        :returns: A FirmwareComponent object.
        :raises: FirmwareComponentAlreadyExists if any  of the component
            records already exists.
        """

    @abc.abstractclassmethod
    def update_firmware_component(self, node_id, component, values):
        """Update a FirmwareComponent record.

        :param node_id: The node id.
        :param component: The component of the node to update.
        :param values: A dictionary with the new information about the
            FirmwareComponent.

                     ::

                      {
                        'current_version': String,
                        'last_version_flashed': String
                      }
        :returns: A FirmwareComponent object.
        :raises: FirmwareComponentNotFound the component
            is not found.
        """

    @abc.abstractmethod
    def get_firmware_component(self, node_id, name):
        """Retrieve Firmware Component.

        :param node_id: The node id.
        :param name: name of Firmware component.
        :returns: The FirmwareComponent object.
        :raises: NodeNotFound if the node is not found.
        :raises: FirmwareComponentNotFound if the Firmware component
            is not found.
        """

    @abc.abstractclassmethod
    def get_firmware_component_list(self, node_id):
        """Retrieve a list Firmware Components of a given node.

        :param node_id: The node id.
        :returns: A list of FirmwareComponent objects.
        :raises: NodeNotFound if the node is not found.
        """
