def _get_provider_by_uuid(context, uuid):
"""Given a UUID, return a dict of information about the resource provider
from the database.
:raises: NotFound if no such provider was found
:param uuid: The UUID to look up
"""
rpt = sa.alias(_RP_TBL, name="rp")
parent = sa.alias(_RP_TBL, name="parent")
root = sa.alias(_RP_TBL, name="root")
rp_to_root = sa.join(rpt, root, rpt.c.root_provider_id == root.c.id)
rp_to_parent = sa.outerjoin(
rp_to_root, parent,
rpt.c.parent_provider_id == parent.c.id)
cols = [
rpt.c.id,
rpt.c.uuid,
rpt.c.name,
rpt.c.generation,
root.c.uuid.label("root_provider_uuid"),
parent.c.uuid.label("parent_provider_uuid"),
rpt.c.updated_at,
rpt.c.created_at,
]
sel = sa.select(cols).select_from(rp_to_parent).where(rpt.c.uuid == uuid)
res = context.session.execute(sel).fetchone()
if not res:
raise exception.NotFound(
'No resource provider with uuid %s found' % uuid)
return dict(res)
def _delete_inventory(context, rp, resource_class):
"""Delete up to one Inventory of the given resource_class string.
:raises `exception.ResourceClassNotFound` if resource_class
cannot be found in the DB.
"""
rc_id = context.rc_cache.id_from_string(resource_class)
if not _delete_inventory_from_provider(context, rp, [rc_id]):
raise exception.NotFound('No inventory of class %s found for delete' %
resource_class)
rp.increment_generation()
def _destroy(context, _id, name):
# Don't delete the resource class if it is referred to in the
# inventories table.
num_inv = context.session.query(models.Inventory).filter(
models.Inventory.resource_class_id == _id).count()
if num_inv:
raise exception.ResourceClassInUse(resource_class=name)
res = context.session.query(models.ResourceClass).filter(
models.ResourceClass.id == _id).delete()
if not res:
raise exception.NotFound()
def _delete(context, _id):
# Do a quick check to see if the provider is a parent. If it is, don't
# allow deleting the provider. Note that the foreign key constraint on
# resource_providers.parent_provider_id will prevent deletion of the
# parent within the transaction below. This is just a quick
# short-circuit outside of the transaction boundary.
if _has_child_providers(context, _id):
raise exception.CannotDeleteParentResourceProvider()
# Don't delete the resource provider if it has allocations.
rp_allocations = context.session.query(models.Allocation).filter(
models.Allocation.resource_provider_id == _id).count()
if rp_allocations:
raise exception.ResourceProviderInUse()
# Delete any inventory associated with the resource provider
query = context.session.query(models.Inventory)
query = query.filter(models.Inventory.resource_provider_id == _id)
query.delete(synchronize_session=False)
# Delete any aggregate associations for the resource provider
# The name substitution on the next line is needed to satisfy pep8
RPA_model = models.ResourceProviderAggregate
context.session.query(RPA_model).filter(
RPA_model.resource_provider_id == _id).delete()
# delete any trait associations for the resource provider
RPT_model = models.ResourceProviderTrait
context.session.query(RPT_model).filter(
RPT_model.resource_provider_id == _id).delete()
# set root_provider_id to null to make deletion possible
query = context.session.query(models.ResourceProvider)
query = query.filter(
models.ResourceProvider.id == _id,
models.ResourceProvider.root_provider_id == _id)
query.update({'root_provider_id': None})
# Now delete the RP record
try:
result = _delete_rp_record(context, _id)
except sqla_exc.IntegrityError:
# NOTE(jaypipes): Another thread snuck in and parented this
# resource provider in between the above check for
# _has_child_providers() and our attempt to delete the record
raise exception.CannotDeleteParentResourceProvider()
if not result:
raise exception.NotFound()
