# 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 openstack import _log
from openstack.baremetal.v1 import _common
from openstack.baremetal.v1 import allocation as _allocation
from openstack.baremetal.v1 import chassis as _chassis
from openstack.baremetal.v1 import driver as _driver
from openstack.baremetal.v1 import node as _node
from openstack.baremetal.v1 import port as _port
from openstack.baremetal.v1 import port_group as _portgroup
from openstack import proxy
from openstack import utils


_logger = _log.setup_logging('openstack')


class Proxy(proxy.Proxy):

    retriable_status_codes = _common.RETRIABLE_STATUS_CODES

    def chassis(self, details=False, **query):
        """Retrieve a generator of chassis.

        :param details: A boolean indicating whether the detailed information
                        for every chassis should be returned.
        :param dict query: Optional query parameters to be sent to
            restrict the chassis to be returned. Available parameters include:

            * ``fields``: A list containing one or more fields to be returned
              in the response. This may lead to some performance gain
              because other fields of the resource are not refreshed.
            * ``limit``: Requests at most the specified number of items be
              returned from the query.
            * ``marker``: Specifies the ID of the last-seen chassis. Use the
              ``limit`` parameter to make an initial limited request and
              use the ID of the last-seen chassis from the response as
              the ``marker`` value in a subsequent limited request.
            * ``sort_dir``: Sorts the response by the requested sort direction.
              A valid value is ``asc`` (ascending) or ``desc``
              (descending). Default is ``asc``. You can specify multiple
              pairs of sort key and sort direction query parameters. If
              you omit the sort direction in a pair, the API uses the
              natural sorting direction of the server attribute that is
              provided as the ``sort_key``.
            * ``sort_key``: Sorts the response by the this attribute value.
              Default is ``id``. You can specify multiple pairs of sort
              key and sort direction query parameters. If you omit the
              sort direction in a pair, the API uses the natural sorting
              direction of the server attribute that is provided as the
              ``sort_key``.

        :returns: A generator of chassis instances.
        """
        return _chassis.Chassis.list(self, details=details, **query)

    def create_chassis(self, **attrs):
        """Create a new chassis from attributes.

        :param dict attrs: Keyword arguments that will be used to create a
             :class:`~openstack.baremetal.v1.chassis.Chassis`.

        :returns: The results of chassis creation.
        :rtype: :class:`~openstack.baremetal.v1.chassis.Chassis`.
        """
        return self._create(_chassis.Chassis, **attrs)

    def find_chassis(self, name_or_id, ignore_missing=True):
        """Find a single chassis.

        :param str name_or_id: The ID of a chassis.
        :param bool ignore_missing: When set to ``False``, an exception of
            :class:`~openstack.exceptions.ResourceNotFound` will be raised
            when the chassis does not exist.  When set to `True``, None will
            be returned when attempting to find a nonexistent chassis.
        :returns: One :class:`~openstack.baremetal.v1.chassis.Chassis` object
            or None.
        """
        return self._find(_chassis.Chassis, name_or_id,
                          ignore_missing=ignore_missing)

    def get_chassis(self, chassis):
        """Get a specific chassis.

        :param chassis: The value can be the ID of a chassis or a
            :class:`~openstack.baremetal.v1.chassis.Chassis` instance.

        :returns: One :class:`~openstack.baremetal.v1.chassis.Chassis`
        :raises: :class:`~openstack.exceptions.ResourceNotFound` when no
            chassis matching the name or ID could be found.
        """
        return self._get(_chassis.Chassis, chassis)

    def update_chassis(self, chassis, **attrs):
        """Update a chassis.

        :param chassis: Either the ID of a chassis, or an instance
            of :class:`~openstack.baremetal.v1.chassis.Chassis`.
        :param dict attrs: The attributes to update on the chassis represented
            by the ``chassis`` parameter.

        :returns: The updated chassis.
        :rtype: :class:`~openstack.baremetal.v1.chassis.Chassis`
        """
        return self._update(_chassis.Chassis, chassis, **attrs)

    def delete_chassis(self, chassis, ignore_missing=True):
        """Delete a chassis.

        :param chassis: The value can be either the ID of a chassis or
            a :class:`~openstack.baremetal.v1.chassis.Chassis` instance.
        :param bool ignore_missing: When set to ``False``, an exception
            :class:`~openstack.exceptions.ResourceNotFound` will be raised
            when the chassis could not be found. When set to ``True``, no
            exception will be raised when attempting to delete a non-existent
            chassis.

        :returns: The instance of the chassis which was deleted.
        :rtype: :class:`~openstack.baremetal.v1.chassis.Chassis`.
        """
        return self._delete(_chassis.Chassis, chassis,
                            ignore_missing=ignore_missing)

    def drivers(self, details=False):
        """Retrieve a generator of drivers.

        :param bool details: A boolean indicating whether the detailed
            information for every driver should be returned.
        :returns: A generator of driver instances.
        """
        kwargs = {}
        # NOTE(dtantsur): details are available starting with API microversion
        # 1.30. Thus we do not send any value if not needed.
        if details:
            kwargs['details'] = True
        return self._list(_driver.Driver, **kwargs)

    def get_driver(self, driver):
        """Get a specific driver.

        :param driver: The value can be the name of a driver or a
            :class:`~openstack.baremetal.v1.driver.Driver` instance.

        :returns: One :class:`~openstack.baremetal.v1.driver.Driver`
        :raises: :class:`~openstack.exceptions.ResourceNotFound` when no
            driver matching the name could be found.
        """
        return self._get(_driver.Driver, driver)

    def nodes(self, details=False, **query):
        """Retrieve a generator of nodes.

        :param details: A boolean indicating whether the detailed information
                        for every node should be returned.
        :param dict query: Optional query parameters to be sent to restrict
            the nodes returned. Available parameters include:

            * ``associated``: Only return those which are, or are not,
              associated with an ``instance_id``.
            * ``conductor_group``: Only return those in the specified
              ``conductor_group``.
            * ``driver``: Only return those with the specified ``driver``.
            * ``fault``: Only return those with the specified fault type.
            * ``fields``: A list containing one or more fields to be returned
              in the response. This may lead to some performance gain
              because other fields of the resource are not refreshed.
            * ``instance_id``: Only return the node with this specific instance
              UUID or an empty set if not found.
            * ``is_maintenance``: Only return those with ``maintenance`` set to
              ``True`` or ``False``.
            * ``limit``: Requests at most the specified number of nodes be
              returned from the query.
            * ``marker``: Specifies the ID of the last-seen node. Use the
              ``limit`` parameter to make an initial limited request and
              use the ID of the last-seen node from the response as
              the ``marker`` value in a subsequent limited request.
            * ``provision_state``: Only return those nodes with the specified
              ``provision_state``.
            * ``resource_class``: Only return those with the specified
              ``resource_class``.
            * ``sort_dir``: Sorts the response by the requested sort direction.
              A valid value is ``asc`` (ascending) or ``desc``
              (descending). Default is ``asc``. You can specify multiple
              pairs of sort key and sort direction query parameters. If
              you omit the sort direction in a pair, the API uses the
              natural sorting direction of the server attribute that is
              provided as the ``sort_key``.
            * ``sort_key``: Sorts the response by the this attribute value.
              Default is ``id``. You can specify multiple pairs of sort
              key and sort direction query parameters. If you omit the
              sort direction in a pair, the API uses the natural sorting
              direction of the server attribute that is provided as the
              ``sort_key``.

        :returns: A generator of :class:`~openstack.baremetal.v1.node.Node`
        """
        return _node.Node.list(self, details=details, **query)

    def create_node(self, **attrs):
        """Create a new node from attributes.

        :param dict attrs: Keyword arguments that will be used to create a
             :class:`~openstack.baremetal.v1.node.Node`.

        :returns: The results of node creation.
        :rtype: :class:`~openstack.baremetal.v1.node.Node`.
        """
        return self._create(_node.Node, **attrs)

    def find_node(self, name_or_id, ignore_missing=True):
        """Find a single node.

        :param str name_or_id: The name or ID of a node.
        :param bool ignore_missing: When set to ``False``, an exception of
            :class:`~openstack.exceptions.ResourceNotFound` will be raised
            when the node does not exist.  When set to `True``, None will
            be returned when attempting to find a nonexistent node.
        :returns: One :class:`~openstack.baremetal.v1.node.Node` object
            or None.
        """
        return self._find(_node.Node, name_or_id,
                          ignore_missing=ignore_missing)

    def get_node(self, node):
        """Get a specific node.

        :param node: The value can be the name or ID of a node or a
            :class:`~openstack.baremetal.v1.node.Node` instance.

        :returns: One :class:`~openstack.baremetal.v1.node.Node`
        :raises: :class:`~openstack.exceptions.ResourceNotFound` when no
            node matching the name or ID could be found.
        """
        return self._get(_node.Node, node)

    def update_node(self, node, retry_on_conflict=True, **attrs):
        """Update a node.

        :param chassis: Either the name or the ID of a node or an instance
            of :class:`~openstack.baremetal.v1.node.Node`.
        :param bool retry_on_conflict: Whether to retry HTTP CONFLICT error.
            Most of the time it can be retried, since it is caused by the node
            being locked. However, when setting ``instance_id``, this is
            a normal code and should not be retried.
        :param dict attrs: The attributes to update on the node represented
            by the ``node`` parameter.

        :returns: The updated node.
        :rtype: :class:`~openstack.baremetal.v1.node.Node`
        """
        res = self._get_resource(_node.Node, node, **attrs)
        return res.commit(self, retry_on_conflict=retry_on_conflict)

    def set_node_provision_state(self, node, target, config_drive=None,
                                 clean_steps=None, rescue_password=None,
                                 wait=False, timeout=None):
        """Run an action modifying node's provision state.

        This call is asynchronous, it will return success as soon as the Bare
        Metal service acknowledges the request.

        :param node: The value can be the name or ID of a node or a
            :class:`~openstack.baremetal.v1.node.Node` instance.
        :param target: Provisioning action, e.g. ``active``, ``provide``.
            See the Bare Metal service documentation for available actions.
        :param config_drive: Config drive to pass to the node, only valid
            for ``active` and ``rebuild`` targets. You can use functions from
            :mod:`openstack.baremetal.configdrive` to build it.
        :param clean_steps: Clean steps to execute, only valid for ``clean``
            target.
        :param rescue_password: Password for the rescue operation, only valid
            for ``rescue`` target.
        :param wait: Whether to wait for the node to get into the expected
            state. The expected state is determined from a combination of
            the current provision state and ``target``.
        :param timeout: If ``wait`` is set to ``True``, specifies how much (in
            seconds) to wait for the expected state to be reached. The value of
            ``None`` (the default) means no client-side timeout.

        :returns: The updated :class:`~openstack.baremetal.v1.node.Node`
        :raises: ValueError if ``config_drive``, ``clean_steps`` or
            ``rescue_password`` are provided with an invalid ``target``.
        """
        res = self._get_resource(_node.Node, node)
        return res.set_provision_state(self, target, config_drive=config_drive,
                                       clean_steps=clean_steps,
                                       rescue_password=rescue_password,
                                       wait=wait, timeout=timeout)

    def wait_for_nodes_provision_state(self, nodes, expected_state,
                                       timeout=None,
                                       abort_on_failed_state=True):
        """Wait for the nodes to reach the expected state.

        :param nodes: List of nodes - name, ID or
            :class:`~openstack.baremetal.v1.node.Node` instance.
        :param expected_state: The expected provisioning state to reach.
        :param timeout: If ``wait`` is set to ``True``, specifies how much (in
            seconds) to wait for the expected state to be reached. The value of
            ``None`` (the default) means no client-side timeout.
        :param abort_on_failed_state: If ``True`` (the default), abort waiting
            if any node reaches a failure state which does not match the
            expected one. Note that the failure state for ``enroll`` ->
            ``manageable`` transition is ``enroll`` again.

        :return: The list of :class:`~openstack.baremetal.v1.node.Node`
            instances that reached the requested state.
        """
        log_nodes = ', '.join(n.id if isinstance(n, _node.Node) else n
                              for n in nodes)

        finished = []
        remaining = nodes
        for count in utils.iterate_timeout(
                timeout,
                "Timeout waiting for nodes %(nodes)s to reach "
                "target state '%(state)s'" % {'nodes': log_nodes,
                                              'state': expected_state}):
            nodes = [self.get_node(n) for n in remaining]
            remaining = []
            for n in nodes:
                if n._check_state_reached(self, expected_state,
                                          abort_on_failed_state):
                    finished.append(n)
                else:
                    remaining.append(n)

            if not remaining:
                return finished

            _logger.debug('Still waiting for nodes %(nodes)s to reach state '
                          '"%(target)s"',
                          {'nodes': ', '.join(n.id for n in remaining),
                           'target': expected_state})

    def set_node_power_state(self, node, target):
        """Run an action modifying node's power state.

        This call is asynchronous, it will return success as soon as the Bare
        Metal service acknowledges the request.

        :param node: The value can be the name or ID of a node or a
            :class:`~openstack.baremetal.v1.node.Node` instance.
        :param target: Target power state, e.g. "rebooting", "power on".
            See the Bare Metal service documentation for available actions.
        """
        self._get_resource(_node.Node, node).set_power_state(self, target)

    def wait_for_node_reservation(self, node, timeout=None):
        """Wait for a lock on the node to be released.

        Bare metal nodes in ironic have a reservation lock that
        is used to represent that a conductor has locked the node
        while performing some sort of action, such as changing
        configuration as a result of a machine state change.

        This lock can occur during power syncronization, and prevents
        updates to objects attached to the node, such as ports.

        Note that nothing prevents a conductor from acquiring the lock again
        after this call returns, so it should be treated as best effort.

        Returns immediately if there is no reservation on the node.

        :param node: The value can be the name or ID of a node or a
            :class:`~openstack.baremetal.v1.node.Node` instance.
        :param timeout: How much (in seconds) to wait for the lock to be
            released. The value of ``None`` (the default) means no timeout.

        :returns: The updated :class:`~openstack.baremetal.v1.node.Node`
        """
        res = self._get_resource(_node.Node, node)
        return res.wait_for_reservation(self, timeout=timeout)

    def validate_node(self, node, required=('boot', 'deploy', 'power')):
        """Validate required information on a node.

        :param node: The value can be either the name or ID of a node or
            a :class:`~openstack.baremetal.v1.node.Node` instance.
        :param required: List of interfaces that are required to pass
            validation. The default value is the list of minimum required
            interfaces for provisioning.

        :return: dict mapping interface names to
            :class:`~openstack.baremetal.v1.node.ValidationResult` objects.
        :raises: :exc:`~openstack.exceptions.ValidationException` if validation
            fails for a required interface.
        """
        res = self._get_resource(_node.Node, node)
        return res.validate(self, required=required)

    def delete_node(self, node, ignore_missing=True):
        """Delete a node.

        :param node: The value can be either the name or ID of a node or
            a :class:`~openstack.baremetal.v1.node.Node` instance.
        :param bool ignore_missing: When set to ``False``, an exception
            :class:`~openstack.exceptions.ResourceNotFound` will be raised
            when the node could not be found. When set to ``True``, no
            exception will be raised when attempting to delete a non-existent
            node.

        :returns: The instance of the node which was deleted.
        :rtype: :class:`~openstack.baremetal.v1.node.Node`.
        """
        return self._delete(_node.Node, node, ignore_missing=ignore_missing)

    def ports(self, details=False, **query):
        """Retrieve a generator of ports.

        :param details: A boolean indicating whether the detailed information
                        for every port should be returned.
        :param dict query: Optional query parameters to be sent to restrict
            the ports returned. Available parameters include:

            * ``address``: Only return ports with the specified physical
              hardware address, typically a MAC address.
            * ``driver``: Only return those with the specified ``driver``.
            * ``fields``: A list containing one or more fields to be returned
              in the response. This may lead to some performance gain
              because other fields of the resource are not refreshed.
            * ``limit``: Requests at most the specified number of ports be
              returned from the query.
            * ``marker``: Specifies the ID of the last-seen port. Use the
              ``limit`` parameter to make an initial limited request and
              use the ID of the last-seen port from the response as
              the ``marker`` value in a subsequent limited request.
            * ``node``:only return the ones associated with this specific node
              (name or UUID), or an empty set if not found.
            * ``node_id``:only return the ones associated with this specific
              node UUID, or an empty set if not found.
            * ``portgroup``: only return the ports associated with this
              specific Portgroup (name or UUID), or an empty set if not
              found.  Added in API microversion 1.24.
            * ``sort_dir``: Sorts the response by the requested sort direction.
              A valid value is ``asc`` (ascending) or ``desc``
              (descending). Default is ``asc``. You can specify multiple
              pairs of sort key and sort direction query parameters. If
              you omit the sort direction in a pair, the API uses the
              natural sorting direction of the server attribute that is
              provided as the ``sort_key``.
            * ``sort_key``: Sorts the response by the this attribute value.
              Default is ``id``. You can specify multiple pairs of sort
              key and sort direction query parameters. If you omit the
              sort direction in a pair, the API uses the natural sorting
              direction of the server attribute that is provided as the
              ``sort_key``.

        :returns: A generator of port instances.
        """
        return _port.Port.list(self, details=details, **query)

    def create_port(self, **attrs):
        """Create a new port from attributes.

        :param dict attrs: Keyword arguments that will be used to create a
             :class:`~openstack.baremetal.v1.port.Port`.

        :returns: The results of port creation.
        :rtype: :class:`~openstack.baremetal.v1.port.Port`.
        """
        return self._create(_port.Port, **attrs)

    def find_port(self, name_or_id, ignore_missing=True):
        """Find a single port.

        :param str name_or_id: The ID of a port.
        :param bool ignore_missing: When set to ``False``, an exception of
            :class:`~openstack.exceptions.ResourceNotFound` will be raised
            when the port does not exist.  When set to `True``, None will
            be returned when attempting to find a nonexistent port.
        :returns: One :class:`~openstack.baremetal.v1.port.Port` object
            or None.
        """
        return self._find(_port.Port, name_or_id,
                          ignore_missing=ignore_missing)

    def get_port(self, port, **query):
        """Get a specific port.

        :param port: The value can be the ID of a port or a
            :class:`~openstack.baremetal.v1.port.Port` instance.
        :param dict query: Optional query parameters to be sent to restrict
            the port properties returned. Available parameters include:

            * ``fields``: A list containing one or more fields to be returned
              in the response. This may lead to some performance gain
              because other fields of the resource are not refreshed.

        :returns: One :class:`~openstack.baremetal.v1.port.Port`
        :raises: :class:`~openstack.exceptions.ResourceNotFound` when no
            port matching the name or ID could be found.
        """
        return self._get(_port.Port, port, **query)

    def update_port(self, port, **attrs):
        """Update a port.

        :param chassis: Either the ID of a port or an instance
            of :class:`~openstack.baremetal.v1.port.Port`.
        :param dict attrs: The attributes to update on the port represented
            by the ``port`` parameter.

        :returns: The updated port.
        :rtype: :class:`~openstack.baremetal.v1.port.Port`
        """
        return self._update(_port.Port, port, **attrs)

    def delete_port(self, port, ignore_missing=True):
        """Delete a port.

        :param port: The value can be either the ID of a port or
            a :class:`~openstack.baremetal.v1.port.Port` instance.
        :param bool ignore_missing: When set to ``False``, an exception
            :class:`~openstack.exceptions.ResourceNotFound` will be raised
            when the port could not be found. When set to ``True``, no
            exception will be raised when attempting to delete a non-existent
            port.

        :returns: The instance of the port which was deleted.
        :rtype: :class:`~openstack.baremetal.v1.port.Port`.
        """
        return self._delete(_port.Port, port, ignore_missing=ignore_missing)

    def port_groups(self, details=False, **query):
        """Retrieve a generator of port groups.

        :param details: A boolean indicating whether the detailed information
                        for every port group should be returned.
        :param dict query: Optional query parameters to be sent to restrict
            the port groups returned. Available parameters include:

            * ``address``: Only return portgroups with the specified physical
              hardware address, typically a MAC address.
            * ``fields``: A list containing one or more fields to be returned
              in the response. This may lead to some performance gain
              because other fields of the resource are not refreshed.
            * ``limit``: Requests at most the specified number of portgroups
              returned from the query.
            * ``marker``: Specifies the ID of the last-seen portgroup. Use the
              ``limit`` parameter to make an initial limited request and
              use the ID of the last-seen portgroup from the response as
              the ``marker`` value in a subsequent limited request.
            * ``node``:only return the ones associated with this specific node
              (name or UUID), or an empty set if not found.
            * ``sort_dir``: Sorts the response by the requested sort direction.
              A valid value is ``asc`` (ascending) or ``desc``
              (descending). Default is ``asc``. You can specify multiple
              pairs of sort key and sort direction query parameters. If
              you omit the sort direction in a pair, the API uses the
              natural sorting direction of the server attribute that is
              provided as the ``sort_key``.
            * ``sort_key``: Sorts the response by the this attribute value.
              Default is ``id``. You can specify multiple pairs of sort
              key and sort direction query parameters. If you omit the
              sort direction in a pair, the API uses the natural sorting
              direction of the server attribute that is provided as the
              ``sort_key``.

        :returns: A generator of port group instances.
        """
        return _portgroup.PortGroup.list(self, details=details, **query)

    def create_port_group(self, **attrs):
        """Create a new portgroup from attributes.

        :param dict attrs: Keyword arguments that will be used to create a
             :class:`~openstack.baremetal.v1.port_group.PortGroup`.

        :returns: The results of portgroup creation.
        :rtype: :class:`~openstack.baremetal.v1.port_group.PortGroup`.
        """
        return self._create(_portgroup.PortGroup, **attrs)

    def find_port_group(self, name_or_id, ignore_missing=True):
        """Find a single port group.

        :param str name_or_id: The name or ID of a portgroup.
        :param bool ignore_missing: When set to ``False``, an exception of
            :class:`~openstack.exceptions.ResourceNotFound` will be raised
            when the port group does not exist.  When set to `True``, None will
            be returned when attempting to find a nonexistent port group.
        :returns: One :class:`~openstack.baremetal.v1.port_group.PortGroup`
            object or None.
        """
        return self._find(_portgroup.PortGroup, name_or_id,
                          ignore_missing=ignore_missing)

    def get_port_group(self, port_group, **query):
        """Get a specific port group.

        :param port_group: The value can be the name or ID of a chassis or a
            :class:`~openstack.baremetal.v1.port_group.PortGroup` instance.
        :param dict query: Optional query parameters to be sent to restrict
            the port group properties returned. Available parameters include:

            * ``fields``: A list containing one or more fields to be returned
              in the response. This may lead to some performance gain
              because other fields of the resource are not refreshed.

        :returns: One :class:`~openstack.baremetal.v1.port_group.PortGroup`
        :raises: :class:`~openstack.exceptions.ResourceNotFound` when no
            port group matching the name or ID could be found.
        """
        return self._get(_portgroup.PortGroup, port_group, **query)

    def update_port_group(self, port_group, **attrs):
        """Update a port group.

        :param chassis: Either the name or the ID of a port group or
            an instance of
            :class:`~openstack.baremetal.v1.port_group.PortGroup`.
        :param dict attrs: The attributes to update on the port group
            represented by the ``port_group`` parameter.

        :returns: The updated port group.
        :rtype: :class:`~openstack.baremetal.v1.port_group.PortGroup`
        """
        return self._update(_portgroup.PortGroup, port_group, **attrs)

    def delete_port_group(self, port_group, ignore_missing=True):
        """Delete a port group.

        :param port_group: The value can be either the name or ID of
            a port group or a
            :class:`~openstack.baremetal.v1.port_group.PortGroup`
            instance.
        :param bool ignore_missing: When set to ``False``, an exception
            :class:`~openstack.exceptions.ResourceNotFound` will be raised
            when the port group could not be found. When set to ``True``, no
            exception will be raised when attempting to delete a non-existent
            port group.

        :returns: The instance of the port group which was deleted.
        :rtype: :class:`~openstack.baremetal.v1.port_group.PortGroup`.
        """
        return self._delete(_portgroup.PortGroup, port_group,
                            ignore_missing=ignore_missing)

    def attach_vif_to_node(self, node, vif_id, retry_on_conflict=True):
        """Attach a VIF to the node.

        The exact form of the VIF ID depends on the network interface used by
        the node. In the most common case it is a Network service port
        (NOT a Bare Metal port) ID. A VIF can only be attached to one node
        at a time.

        :param node: The value can be either the name or ID of a node or
            a :class:`~openstack.baremetal.v1.node.Node` instance.
        :param string vif_id: Backend-specific VIF ID.
        :param retry_on_conflict: Whether to retry HTTP CONFLICT errors.
            This can happen when either the VIF is already used on a node or
            the node is locked. Since the latter happens more often, the
            default value is True.
        :return: ``None``
        :raises: :exc:`~openstack.exceptions.NotSupported` if the server
            does not support the VIF API.
        """
        res = self._get_resource(_node.Node, node)
        res.attach_vif(self, vif_id, retry_on_conflict=retry_on_conflict)

    def detach_vif_from_node(self, node, vif_id, ignore_missing=True):
        """Detach a VIF from the node.

        The exact form of the VIF ID depends on the network interface used by
        the node. In the most common case it is a Network service port
        (NOT a Bare Metal port) ID.

        :param node: The value can be either the name or ID of a node or
            a :class:`~openstack.baremetal.v1.node.Node` instance.
        :param string vif_id: Backend-specific VIF ID.
        :param bool ignore_missing: When set to ``False``
                    :class:`~openstack.exceptions.ResourceNotFound` will be
                    raised when the VIF does not exist. Otherwise, ``False``
                    is returned.
        :return: ``True`` if the VIF was detached, otherwise ``False``.
        :raises: :exc:`~openstack.exceptions.NotSupported` if the server
            does not support the VIF API.
        """
        res = self._get_resource(_node.Node, node)
        return res.detach_vif(self, vif_id, ignore_missing=ignore_missing)

    def list_node_vifs(self, node):
        """List IDs of VIFs attached to the node.

        The exact form of the VIF ID depends on the network interface used by
        the node. In the most common case it is a Network service port
        (NOT a Bare Metal port) ID.

        :param node: The value can be either the name or ID of a node or
            a :class:`~openstack.baremetal.v1.node.Node` instance.
        :return: List of VIF IDs as strings.
        :raises: :exc:`~openstack.exceptions.NotSupported` if the server
            does not support the VIF API.
        """
        res = self._get_resource(_node.Node, node)
        return res.list_vifs(self)

    def allocations(self, **query):
        """Retrieve a generator of allocations.

        :param dict query: Optional query parameters to be sent to restrict
            the allocation to be returned. Available parameters include:

            * ``fields``: A list containing one or more fields to be returned
              in the response. This may lead to some performance gain
              because other fields of the resource are not refreshed.
            * ``limit``: Requests at most the specified number of items be
              returned from the query.
            * ``marker``: Specifies the ID of the last-seen allocation. Use the
              ``limit`` parameter to make an initial limited request and
              use the ID of the last-seen allocation from the response as
              the ``marker`` value in a subsequent limited request.
            * ``sort_dir``: Sorts the response by the requested sort direction.
              A valid value is ``asc`` (ascending) or ``desc``
              (descending). Default is ``asc``. You can specify multiple
              pairs of sort key and sort direction query parameters. If
              you omit the sort direction in a pair, the API uses the
              natural sorting direction of the server attribute that is
              provided as the ``sort_key``.
            * ``sort_key``: Sorts the response by the this attribute value.
              Default is ``id``. You can specify multiple pairs of sort
              key and sort direction query parameters. If you omit the
              sort direction in a pair, the API uses the natural sorting
              direction of the server attribute that is provided as the
              ``sort_key``.

        :returns: A generator of allocation instances.
        """
        return _allocation.Allocation.list(self, **query)

    def create_allocation(self, **attrs):
        """Create a new allocation from attributes.

        :param dict attrs: Keyword arguments that will be used to create a
             :class:`~openstack.baremetal.v1.allocation.Allocation`.

        :returns: The results of allocation creation.
        :rtype: :class:`~openstack.baremetal.v1.allocation.Allocation`.
        """
        return self._create(_allocation.Allocation, **attrs)

    def get_allocation(self, allocation):
        """Get a specific allocation.

        :param allocation: The value can be the name or ID of an allocation or
            a :class:`~openstack.baremetal.v1.allocation.Allocation` instance.

        :returns: One :class:`~openstack.baremetal.v1.allocation.Allocation`
        :raises: :class:`~openstack.exceptions.ResourceNotFound` when no
            allocation matching the name or ID could be found.
        """
        return self._get(_allocation.Allocation, allocation)

    def delete_allocation(self, allocation, ignore_missing=True):
        """Delete an allocation.

        :param allocation: The value can be the name or ID of an allocation or
            a :class:`~openstack.baremetal.v1.allocation.Allocation` instance.
        :param bool ignore_missing: When set to ``False``, an exception
            :class:`~openstack.exceptions.ResourceNotFound` will be raised
            when the allocation could not be found. When set to ``True``, no
            exception will be raised when attempting to delete a non-existent
            allocation.

        :returns: The instance of the allocation which was deleted.
        :rtype: :class:`~openstack.baremetal.v1.allocation.Allocation`.
        """
        return self._delete(_allocation.Allocation, allocation,
                            ignore_missing=ignore_missing)

    def wait_for_allocation(self, allocation, timeout=None,
                            ignore_error=False):
        """Wait for the allocation to become active.

        :param allocation: The value can be the name or ID of an allocation or
            a :class:`~openstack.baremetal.v1.allocation.Allocation` instance.
        :param timeout: How much (in seconds) to wait for the allocation.
            The value of ``None`` (the default) means no client-side timeout.
        :param ignore_error: If ``True``, this call will raise an exception
            if the allocation reaches the ``error`` state. Otherwise the error
            state is considered successful and the call returns.

        :returns: The instance of the allocation.
        :rtype: :class:`~openstack.baremetal.v1.allocation.Allocation`.
        """
        res = self._get_resource(_allocation.Allocation, allocation)
        return res.wait(self, timeout=timeout, ignore_error=ignore_error)
