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api.py
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api.py
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# vim: tabstop=4 shiftwidth=4 softtabstop=4
# Copyright (c) 2011 X.commerce, a business unit of eBay Inc.
# Copyright 2010 United States Government as represented by the
# Administrator of the National Aeronautics and Space Administration.
# All Rights Reserved.
#
# Licensed under the Apache License, Version 2.0 (the "License"); you may
# not use this file except in compliance with the License. You may obtain
# a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
# License for the specific language governing permissions and limitations
# under the License.
"""Implementation of SQLAlchemy backend."""
import collections
import copy
import datetime
import functools
import warnings
from nova import block_device
from nova.common.sqlalchemyutils import paginate_query
from nova.compute import vm_states
from nova import db
from nova.db.sqlalchemy import models
from nova.db.sqlalchemy.session import get_session
from nova import exception
from nova import flags
from nova.openstack.common import log as logging
from nova.openstack.common import timeutils
from nova import utils
from sqlalchemy import and_
from sqlalchemy.exc import IntegrityError
from sqlalchemy import or_
from sqlalchemy.orm import joinedload
from sqlalchemy.orm import joinedload_all
from sqlalchemy.sql.expression import asc
from sqlalchemy.sql.expression import desc
from sqlalchemy.sql.expression import literal_column
from sqlalchemy.sql import func
FLAGS = flags.FLAGS
LOG = logging.getLogger(__name__)
def is_admin_context(context):
"""Indicates if the request context is an administrator."""
if not context:
warnings.warn(_('Use of empty request context is deprecated'),
DeprecationWarning)
raise Exception('die')
return context.is_admin
def is_user_context(context):
"""Indicates if the request context is a normal user."""
if not context:
return False
if context.is_admin:
return False
if not context.user_id or not context.project_id:
return False
return True
def authorize_project_context(context, project_id):
"""Ensures a request has permission to access the given project."""
if is_user_context(context):
if not context.project_id:
raise exception.NotAuthorized()
elif context.project_id != project_id:
raise exception.NotAuthorized()
def authorize_user_context(context, user_id):
"""Ensures a request has permission to access the given user."""
if is_user_context(context):
if not context.user_id:
raise exception.NotAuthorized()
elif context.user_id != user_id:
raise exception.NotAuthorized()
def authorize_quota_class_context(context, class_name):
"""Ensures a request has permission to access the given quota class."""
if is_user_context(context):
if not context.quota_class:
raise exception.NotAuthorized()
elif context.quota_class != class_name:
raise exception.NotAuthorized()
def require_admin_context(f):
"""Decorator to require admin request context.
The first argument to the wrapped function must be the context.
"""
def wrapper(*args, **kwargs):
if not is_admin_context(args[0]):
raise exception.AdminRequired()
return f(*args, **kwargs)
return wrapper
def require_context(f):
"""Decorator to require *any* user or admin context.
This does no authorization for user or project access matching, see
:py:func:`authorize_project_context` and
:py:func:`authorize_user_context`.
The first argument to the wrapped function must be the context.
"""
def wrapper(*args, **kwargs):
if not is_admin_context(args[0]) and not is_user_context(args[0]):
raise exception.NotAuthorized()
return f(*args, **kwargs)
return wrapper
def require_instance_exists(f):
"""Decorator to require the specified instance to exist.
Requires the wrapped function to use context and instance_id as
their first two arguments.
"""
@functools.wraps(f)
def wrapper(context, instance_id, *args, **kwargs):
db.instance_get(context, instance_id)
return f(context, instance_id, *args, **kwargs)
return wrapper
def require_instance_exists_using_uuid(f):
"""Decorator to require the specified instance to exist.
Requires the wrapped function to use context and instance_uuid as
their first two arguments.
"""
@functools.wraps(f)
def wrapper(context, instance_uuid, *args, **kwargs):
db.instance_get_by_uuid(context, instance_uuid)
return f(context, instance_uuid, *args, **kwargs)
return wrapper
def require_volume_exists(f):
"""Decorator to require the specified volume to exist.
Requires the wrapped function to use context and volume_id as
their first two arguments.
"""
def wrapper(context, volume_id, *args, **kwargs):
db.volume_get(context, volume_id)
return f(context, volume_id, *args, **kwargs)
wrapper.__name__ = f.__name__
return wrapper
def require_aggregate_exists(f):
"""Decorator to require the specified aggregate to exist.
Requires the wrapped function to use context and aggregate_id as
their first two arguments.
"""
@functools.wraps(f)
def wrapper(context, aggregate_id, *args, **kwargs):
db.aggregate_get(context, aggregate_id)
return f(context, aggregate_id, *args, **kwargs)
return wrapper
def model_query(context, model, *args, **kwargs):
"""Query helper that accounts for context's `read_deleted` field.
:param context: context to query under
:param session: if present, the session to use
:param read_deleted: if present, overrides context's read_deleted field.
:param project_only: if present and context is user-type, then restrict
query to match the context's project_id. If set to 'allow_none',
restriction includes project_id = None.
"""
session = kwargs.get('session') or get_session()
read_deleted = kwargs.get('read_deleted') or context.read_deleted
project_only = kwargs.get('project_only', False)
query = session.query(model, *args)
if read_deleted == 'no':
query = query.filter_by(deleted=False)
elif read_deleted == 'yes':
pass # omit the filter to include deleted and active
elif read_deleted == 'only':
query = query.filter_by(deleted=True)
else:
raise Exception(
_("Unrecognized read_deleted value '%s'") % read_deleted)
if is_user_context(context) and project_only:
if project_only == 'allow_none':
query = query.filter(or_(model.project_id == context.project_id,
model.project_id == None))
else:
query = query.filter_by(project_id=context.project_id)
return query
def exact_filter(query, model, filters, legal_keys):
"""Applies exact match filtering to a query.
Returns the updated query. Modifies filters argument to remove
filters consumed.
:param query: query to apply filters to
:param model: model object the query applies to, for IN-style
filtering
:param filters: dictionary of filters; values that are lists,
tuples, sets, or frozensets cause an 'IN' test to
be performed, while exact matching ('==' operator)
is used for other values
:param legal_keys: list of keys to apply exact filtering to
"""
filter_dict = {}
# Walk through all the keys
for key in legal_keys:
# Skip ones we're not filtering on
if key not in filters:
continue
# OK, filtering on this key; what value do we search for?
value = filters.pop(key)
if key == 'metadata':
column_attr = getattr(model, key)
if isinstance(value, list):
for item in value:
for k, v in item.iteritems():
query = query.filter(column_attr.any(key=k))
query = query.filter(column_attr.any(value=v))
else:
for k, v in value.iteritems():
query = query.filter(column_attr.any(key=k))
query = query.filter(column_attr.any(value=v))
elif isinstance(value, (list, tuple, set, frozenset)):
# Looking for values in a list; apply to query directly
column_attr = getattr(model, key)
query = query.filter(column_attr.in_(value))
else:
# OK, simple exact match; save for later
filter_dict[key] = value
# Apply simple exact matches
if filter_dict:
query = query.filter_by(**filter_dict)
return query
###################
def constraint(**conditions):
return Constraint(conditions)
def equal_any(*values):
return EqualityCondition(values)
def not_equal(*values):
return InequalityCondition(values)
class Constraint(object):
def __init__(self, conditions):
self.conditions = conditions
def apply(self, model, query):
for key, condition in self.conditions.iteritems():
for clause in condition.clauses(getattr(model, key)):
query = query.filter(clause)
return query
class EqualityCondition(object):
def __init__(self, values):
self.values = values
def clauses(self, field):
return or_([field == value for value in self.values])
class InequalityCondition(object):
def __init__(self, values):
self.values = values
def clauses(self, field):
return [field != value for value in self.values]
###################
@require_admin_context
def service_destroy(context, service_id):
session = get_session()
with session.begin():
service_ref = service_get(context, service_id, session=session)
service_ref.delete(session=session)
if (service_ref.topic == FLAGS.compute_topic and
service_ref.compute_node):
for c in service_ref.compute_node:
c.delete(session=session)
@require_admin_context
def service_get(context, service_id, session=None):
result = model_query(context, models.Service, session=session).\
options(joinedload('compute_node')).\
filter_by(id=service_id).\
first()
if not result:
raise exception.ServiceNotFound(service_id=service_id)
return result
@require_admin_context
def service_get_all(context, disabled=None):
query = model_query(context, models.Service)
if disabled is not None:
query = query.filter_by(disabled=disabled)
return query.all()
@require_admin_context
def service_get_all_by_topic(context, topic):
return model_query(context, models.Service, read_deleted="no").\
filter_by(disabled=False).\
filter_by(topic=topic).\
all()
@require_admin_context
def service_get_by_host_and_topic(context, host, topic):
return model_query(context, models.Service, read_deleted="no").\
filter_by(disabled=False).\
filter_by(host=host).\
filter_by(topic=topic).\
first()
@require_admin_context
def service_get_all_by_host(context, host):
return model_query(context, models.Service, read_deleted="no").\
filter_by(host=host).\
all()
@require_admin_context
def service_get_all_compute_by_host(context, host):
result = model_query(context, models.Service, read_deleted="no").\
options(joinedload('compute_node')).\
filter_by(host=host).\
filter_by(topic=FLAGS.compute_topic).\
all()
if not result:
raise exception.ComputeHostNotFound(host=host)
return result
@require_admin_context
def _service_get_all_topic_subquery(context, session, topic, subq, label):
sort_value = getattr(subq.c, label)
return model_query(context, models.Service,
func.coalesce(sort_value, 0),
session=session, read_deleted="no").\
filter_by(topic=topic).\
filter_by(disabled=False).\
outerjoin((subq, models.Service.host == subq.c.host)).\
order_by(sort_value).\
all()
@require_admin_context
def service_get_all_compute_sorted(context):
session = get_session()
with session.begin():
# NOTE(vish): The intended query is below
# SELECT services.*, COALESCE(inst_cores.instance_cores,
# 0)
# FROM services LEFT OUTER JOIN
# (SELECT host, SUM(instances.vcpus) AS instance_cores
# FROM instances GROUP BY host) AS inst_cores
# ON services.host = inst_cores.host
topic = FLAGS.compute_topic
label = 'instance_cores'
subq = model_query(context, models.Instance.host,
func.sum(models.Instance.vcpus).label(label),
session=session, read_deleted="no").\
group_by(models.Instance.host).\
subquery()
return _service_get_all_topic_subquery(context,
session,
topic,
subq,
label)
@require_admin_context
def service_get_all_volume_sorted(context):
session = get_session()
with session.begin():
topic = FLAGS.volume_topic
label = 'volume_gigabytes'
subq = model_query(context, models.Volume.host,
func.sum(models.Volume.size).label(label),
session=session, read_deleted="no").\
group_by(models.Volume.host).\
subquery()
return _service_get_all_topic_subquery(context,
session,
topic,
subq,
label)
@require_admin_context
def service_get_by_args(context, host, binary):
result = model_query(context, models.Service).\
filter_by(host=host).\
filter_by(binary=binary).\
first()
if not result:
raise exception.HostBinaryNotFound(host=host, binary=binary)
return result
@require_admin_context
def service_create(context, values):
service_ref = models.Service()
service_ref.update(values)
if not FLAGS.enable_new_services:
service_ref.disabled = True
service_ref.save()
return service_ref
@require_admin_context
def service_update(context, service_id, values):
session = get_session()
with session.begin():
service_ref = service_get(context, service_id, session=session)
service_ref.update(values)
service_ref.save(session=session)
###################
def compute_node_get(context, compute_id, session=None):
result = model_query(context, models.ComputeNode, session=session).\
filter_by(id=compute_id).\
options(joinedload('service')).\
options(joinedload('stats')).\
first()
if not result:
raise exception.ComputeHostNotFound(host=compute_id)
return result
@require_admin_context
def compute_node_get_all(context, session=None):
return model_query(context, models.ComputeNode, session=session).\
options(joinedload('service')).\
options(joinedload('stats')).\
all()
@require_admin_context
def compute_node_search_by_hypervisor(context, hypervisor_match):
field = models.ComputeNode.hypervisor_hostname
return model_query(context, models.ComputeNode).\
options(joinedload('service')).\
filter(field.like('%%%s%%' % hypervisor_match)).\
all()
def _prep_stats_dict(values):
"""Make list of ComputeNodeStats"""
stats = []
d = values.get('stats', {})
for k, v in d.iteritems():
stat = models.ComputeNodeStat()
stat['key'] = k
stat['value'] = v
stats.append(stat)
values['stats'] = stats
@require_admin_context
def compute_node_create(context, values, session=None):
"""Creates a new ComputeNode and populates the capacity fields
with the most recent data."""
_prep_stats_dict(values)
if not session:
session = get_session()
with session.begin(subtransactions=True):
compute_node_ref = models.ComputeNode()
session.add(compute_node_ref)
compute_node_ref.update(values)
return compute_node_ref
def _update_stats(context, new_stats, compute_id, session, prune_stats=False):
existing = model_query(context, models.ComputeNodeStat, session=session,
read_deleted="no").filter_by(compute_node_id=compute_id).all()
statmap = {}
for stat in existing:
key = stat['key']
statmap[key] = stat
stats = []
for k, v in new_stats.iteritems():
old_stat = statmap.pop(k, None)
if old_stat:
# update existing value:
old_stat.update({'value': v})
stats.append(old_stat)
else:
# add new stat:
stat = models.ComputeNodeStat()
stat['compute_node_id'] = compute_id
stat['key'] = k
stat['value'] = v
stats.append(stat)
if prune_stats:
# prune un-touched old stats:
for stat in statmap.values():
session.add(stat)
stat.update({'deleted': True})
# add new and updated stats
for stat in stats:
session.add(stat)
@require_admin_context
def compute_node_update(context, compute_id, values, prune_stats=False):
"""Updates the ComputeNode record with the most recent data"""
stats = values.pop('stats', {})
session = get_session()
with session.begin(subtransactions=True):
_update_stats(context, stats, compute_id, session, prune_stats)
compute_ref = compute_node_get(context, compute_id, session=session)
compute_ref.update(values)
return compute_ref
def compute_node_get_by_host(context, host):
"""Get all capacity entries for the given host."""
session = get_session()
with session.begin():
node = session.query(models.ComputeNode).\
join('service').\
filter(models.Service.host == host).\
filter_by(deleted=False)
return node.first()
def compute_node_statistics(context):
"""Compute statistics over all compute nodes."""
result = model_query(context,
func.count(models.ComputeNode.id),
func.sum(models.ComputeNode.vcpus),
func.sum(models.ComputeNode.memory_mb),
func.sum(models.ComputeNode.local_gb),
func.sum(models.ComputeNode.vcpus_used),
func.sum(models.ComputeNode.memory_mb_used),
func.sum(models.ComputeNode.local_gb_used),
func.sum(models.ComputeNode.free_ram_mb),
func.sum(models.ComputeNode.free_disk_gb),
func.sum(models.ComputeNode.current_workload),
func.sum(models.ComputeNode.running_vms),
func.sum(models.ComputeNode.disk_available_least),
read_deleted="no").first()
# Build a dict of the info--making no assumptions about result
fields = ('count', 'vcpus', 'memory_mb', 'local_gb', 'vcpus_used',
'memory_mb_used', 'local_gb_used', 'free_ram_mb', 'free_disk_gb',
'current_workload', 'running_vms', 'disk_available_least')
return dict((field, int(result[idx] or 0))
for idx, field in enumerate(fields))
###################
@require_admin_context
def certificate_get(context, certificate_id, session=None):
result = model_query(context, models.Certificate, session=session).\
filter_by(id=certificate_id).\
first()
if not result:
raise exception.CertificateNotFound(certificate_id=certificate_id)
return result
@require_admin_context
def certificate_create(context, values):
certificate_ref = models.Certificate()
for (key, value) in values.iteritems():
certificate_ref[key] = value
certificate_ref.save()
return certificate_ref
@require_admin_context
def certificate_get_all_by_project(context, project_id):
return model_query(context, models.Certificate, read_deleted="no").\
filter_by(project_id=project_id).\
all()
@require_admin_context
def certificate_get_all_by_user(context, user_id):
return model_query(context, models.Certificate, read_deleted="no").\
filter_by(user_id=user_id).\
all()
@require_admin_context
def certificate_get_all_by_user_and_project(context, user_id, project_id):
return model_query(context, models.Certificate, read_deleted="no").\
filter_by(user_id=user_id).\
filter_by(project_id=project_id).\
all()
###################
@require_context
def floating_ip_get(context, id):
result = model_query(context, models.FloatingIp, project_only=True).\
filter_by(id=id).\
first()
if not result:
raise exception.FloatingIpNotFound(id=id)
return result
@require_context
def floating_ip_get_pools(context):
pools = []
for result in model_query(context, models.FloatingIp.pool).distinct():
pools.append({'name': result[0]})
return pools
@require_context
def floating_ip_allocate_address(context, project_id, pool):
authorize_project_context(context, project_id)
session = get_session()
with session.begin():
floating_ip_ref = model_query(context, models.FloatingIp,
session=session, read_deleted="no").\
filter_by(fixed_ip_id=None).\
filter_by(project_id=None).\
filter_by(pool=pool).\
with_lockmode('update').\
first()
# NOTE(vish): if with_lockmode isn't supported, as in sqlite,
# then this has concurrency issues
if not floating_ip_ref:
raise exception.NoMoreFloatingIps()
floating_ip_ref['project_id'] = project_id
session.add(floating_ip_ref)
return floating_ip_ref['address']
@require_context
def floating_ip_bulk_create(context, ips):
existing_ips = {}
for floating in _floating_ip_get_all(context).all():
existing_ips[floating['address']] = floating
session = get_session()
with session.begin():
for ip in ips:
addr = ip['address']
if (addr in existing_ips and
ip.get('id') != existing_ips[addr]['id']):
raise exception.FloatingIpExists(**dict(existing_ips[addr]))
model = models.FloatingIp()
model.update(ip)
session.add(model)
def _ip_range_splitter(ips, block_size=256):
"""Yields blocks of IPs no more than block_size elements long."""
out = []
count = 0
for ip in ips:
out.append(ip['address'])
count += 1
if count > block_size - 1:
yield out
out = []
count = 0
if out:
yield out
@require_context
def floating_ip_bulk_destroy(context, ips):
session = get_session()
with session.begin():
for ip_block in _ip_range_splitter(ips):
model_query(context, models.FloatingIp).\
filter(models.FloatingIp.address.in_(ip_block)).\
update({'deleted': True,
'deleted_at': timeutils.utcnow()},
synchronize_session='fetch')
@require_context
def floating_ip_create(context, values, session=None):
if not session:
session = get_session()
floating_ip_ref = models.FloatingIp()
floating_ip_ref.update(values)
# check uniqueness for not deleted addresses
if not floating_ip_ref.deleted:
try:
floating_ip = floating_ip_get_by_address(context,
floating_ip_ref.address,
session)
except exception.FloatingIpNotFoundForAddress:
pass
else:
if floating_ip.id != floating_ip_ref.id:
raise exception.FloatingIpExists(**dict(floating_ip_ref))
floating_ip_ref.save(session=session)
return floating_ip_ref['address']
@require_context
def floating_ip_count_by_project(context, project_id, session=None):
authorize_project_context(context, project_id)
# TODO(tr3buchet): why leave auto_assigned floating IPs out?
return model_query(context, models.FloatingIp, read_deleted="no",
session=session).\
filter_by(project_id=project_id).\
filter_by(auto_assigned=False).\
count()
@require_context
def floating_ip_fixed_ip_associate(context, floating_address,
fixed_address, host):
session = get_session()
with session.begin():
floating_ip_ref = floating_ip_get_by_address(context,
floating_address,
session=session)
fixed_ip_ref = fixed_ip_get_by_address(context,
fixed_address,
session=session)
floating_ip_ref.fixed_ip_id = fixed_ip_ref["id"]
floating_ip_ref.host = host
floating_ip_ref.save(session=session)
@require_context
def floating_ip_deallocate(context, address):
session = get_session()
with session.begin():
floating_ip_ref = floating_ip_get_by_address(context,
address,
session=session)
floating_ip_ref['project_id'] = None
floating_ip_ref['host'] = None
floating_ip_ref['auto_assigned'] = False
floating_ip_ref.save(session=session)
@require_context
def floating_ip_destroy(context, address):
session = get_session()
with session.begin():
floating_ip_ref = floating_ip_get_by_address(context,
address,
session=session)
floating_ip_ref.delete(session=session)
@require_context
def floating_ip_disassociate(context, address):
session = get_session()
with session.begin():
floating_ip_ref = floating_ip_get_by_address(context,
address,
session=session)
fixed_ip_ref = fixed_ip_get(context,
floating_ip_ref['fixed_ip_id'])
if fixed_ip_ref:
fixed_ip_address = fixed_ip_ref['address']
else:
fixed_ip_address = None
floating_ip_ref.fixed_ip_id = None
floating_ip_ref.host = None
floating_ip_ref.save(session=session)
return fixed_ip_address
@require_context
def floating_ip_set_auto_assigned(context, address):
session = get_session()
with session.begin():
floating_ip_ref = floating_ip_get_by_address(context,
address,
session=session)
floating_ip_ref.auto_assigned = True
floating_ip_ref.save(session=session)
def _floating_ip_get_all(context, session=None):
return model_query(context, models.FloatingIp, read_deleted="no",
session=session)
@require_admin_context
def floating_ip_get_all(context):
floating_ip_refs = _floating_ip_get_all(context).all()
if not floating_ip_refs:
raise exception.NoFloatingIpsDefined()
return floating_ip_refs
@require_admin_context
def floating_ip_get_all_by_host(context, host):
floating_ip_refs = _floating_ip_get_all(context).\
filter_by(host=host).\
all()
if not floating_ip_refs:
raise exception.FloatingIpNotFoundForHost(host=host)
return floating_ip_refs
@require_context
def floating_ip_get_all_by_project(context, project_id):
authorize_project_context(context, project_id)
# TODO(tr3buchet): why do we not want auto_assigned floating IPs here?
return _floating_ip_get_all(context).\
filter_by(project_id=project_id).\
filter_by(auto_assigned=False).\
all()
@require_context
def floating_ip_get_by_address(context, address, session=None):
result = model_query(context, models.FloatingIp, session=session).\
filter_by(address=address).\
first()
if not result:
raise exception.FloatingIpNotFoundForAddress(address=address)
# If the floating IP has a project ID set, check to make sure
# the non-admin user has access.
if result.project_id and is_user_context(context):
authorize_project_context(context, result.project_id)
return result
@require_context
def floating_ip_get_by_fixed_address(context, fixed_address, session=None):
if not session:
session = get_session()
fixed_ip = fixed_ip_get_by_address(context, fixed_address, session)
fixed_ip_id = fixed_ip['id']
return model_query(context, models.FloatingIp, session=session).\
filter_by(fixed_ip_id=fixed_ip_id).\
all()
# NOTE(tr3buchet) please don't invent an exception here, empty list is fine
@require_context
def floating_ip_get_by_fixed_ip_id(context, fixed_ip_id, session=None):
if not session:
session = get_session()
return model_query(context, models.FloatingIp, session=session).\
filter_by(fixed_ip_id=fixed_ip_id).\
all()
@require_context
def floating_ip_update(context, address, values):
session = get_session()
with session.begin():
floating_ip_ref = floating_ip_get_by_address(context, address, session)
for (key, value) in values.iteritems():
floating_ip_ref[key] = value
floating_ip_ref.save(session=session)
@require_context
def _dnsdomain_get(context, session, fqdomain):
return model_query(context, models.DNSDomain,
session=session, read_deleted="no").\
filter_by(domain=fqdomain).\
with_lockmode('update').\
first()
@require_context
def dnsdomain_get(context, fqdomain):
session = get_session()
with session.begin():
return _dnsdomain_get(context, session, fqdomain)
@require_admin_context
def _dnsdomain_get_or_create(context, session, fqdomain):
domain_ref = _dnsdomain_get(context, session, fqdomain)
if not domain_ref:
dns_ref = models.DNSDomain()
dns_ref.update({'domain': fqdomain,
'availability_zone': None,
'project_id': None})
return dns_ref
return domain_ref
@require_admin_context
def dnsdomain_register_for_zone(context, fqdomain, zone):
session = get_session()
with session.begin():
domain_ref = _dnsdomain_get_or_create(context, session, fqdomain)
domain_ref.scope = 'private'
domain_ref.availability_zone = zone
domain_ref.save(session=session)
@require_admin_context
def dnsdomain_register_for_project(context, fqdomain, project):
session = get_session()