/
resource_provider.py
4122 lines (3623 loc) · 177 KB
/
resource_provider.py
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# 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.
import collections
import copy
import itertools
import random
# NOTE(cdent): The resource provider objects are designed to never be
# used over RPC. Remote manipulation is done with the placement HTTP
# API. The 'remotable' decorators should not be used, the objects should
# not be registered and there is no need to express VERSIONs nor handle
# obj_make_compatible.
import os_traits
from oslo_concurrency import lockutils
from oslo_config import cfg
from oslo_db import api as oslo_db_api
from oslo_db import exception as db_exc
from oslo_log import log as logging
from oslo_utils import encodeutils
from oslo_versionedobjects import base
from oslo_versionedobjects import fields
import six
import sqlalchemy as sa
from sqlalchemy import exc as sqla_exc
from sqlalchemy import func
from sqlalchemy import sql
from sqlalchemy.sql import null
from nova.api.openstack.placement import db_api
from nova.api.openstack.placement import exception
from nova.api.openstack.placement.objects import consumer as consumer_obj
from nova.api.openstack.placement.objects import project as project_obj
from nova.api.openstack.placement.objects import user as user_obj
from nova.db.sqlalchemy import api_models as models
from nova.db.sqlalchemy import resource_class_cache as rc_cache
from nova.i18n import _
from nova import rc_fields
_TRAIT_TBL = models.Trait.__table__
_ALLOC_TBL = models.Allocation.__table__
_INV_TBL = models.Inventory.__table__
_RP_TBL = models.ResourceProvider.__table__
# Not used in this file but used in tests.
_RC_TBL = models.ResourceClass.__table__
_AGG_TBL = models.PlacementAggregate.__table__
_RP_AGG_TBL = models.ResourceProviderAggregate.__table__
_RP_TRAIT_TBL = models.ResourceProviderTrait.__table__
_PROJECT_TBL = models.Project.__table__
_USER_TBL = models.User.__table__
_CONSUMER_TBL = models.Consumer.__table__
_RC_CACHE = None
_TRAIT_LOCK = 'trait_sync'
_TRAITS_SYNCED = False
CONF = cfg.CONF
LOG = logging.getLogger(__name__)
@db_api.placement_context_manager.reader
def _ensure_rc_cache(ctx):
"""Ensures that a singleton resource class cache has been created in the
module's scope.
:param ctx: `nova.context.RequestContext` that may be used to grab a DB
connection.
"""
global _RC_CACHE
if _RC_CACHE is not None:
return
_RC_CACHE = rc_cache.ResourceClassCache(ctx)
@oslo_db_api.wrap_db_retry(max_retries=5, retry_on_deadlock=True)
# Bug #1760322: If the caller raises an exception, we don't want the trait
# sync rolled back; so use an .independent transaction
@db_api.placement_context_manager.writer.independent
def _trait_sync(ctx):
"""Sync the os_traits symbols to the database.
Reads all symbols from the os_traits library, checks if any of them do
not exist in the database and bulk-inserts those that are not. This is
done once per process using this code if either Trait.get_by_name or
TraitList.get_all is called.
:param ctx: `nova.context.RequestContext` that may be used to grab a DB
connection.
"""
# Create a set of all traits in the os_traits library.
std_traits = set(os_traits.get_traits())
sel = sa.select([_TRAIT_TBL.c.name])
res = ctx.session.execute(sel).fetchall()
# Create a set of all traits in the db that are not custom
# traits.
db_traits = set(
r[0] for r in res
if not os_traits.is_custom(r[0])
)
# Determine those traits which are in os_traits but not
# currently in the database, and insert them.
need_sync = std_traits - db_traits
ins = _TRAIT_TBL.insert()
batch_args = [
{'name': six.text_type(trait)}
for trait in need_sync
]
if batch_args:
try:
ctx.session.execute(ins, batch_args)
LOG.info("Synced traits from os_traits into API DB: %s",
need_sync)
except db_exc.DBDuplicateEntry:
pass # some other process sync'd, just ignore
def ensure_trait_sync(ctx):
"""Ensures that the os_traits library is synchronized to the traits db.
If _TRAITS_SYNCED is False then this process has not tried to update the
traits db. Do so by calling _trait_sync. Since the placement API server
could be multi-threaded, lock around testing _TRAITS_SYNCED to avoid
duplicating work.
Different placement API server processes that talk to the same database
will avoid issues through the power of transactions.
:param ctx: `nova.context.RequestContext` that may be used to grab a DB
connection.
"""
global _TRAITS_SYNCED
# If another thread is doing this work, wait for it to complete.
# When that thread is done _TRAITS_SYNCED will be true in this
# thread and we'll simply return.
with lockutils.lock(_TRAIT_LOCK):
if not _TRAITS_SYNCED:
_trait_sync(ctx)
_TRAITS_SYNCED = True
def _get_current_inventory_resources(ctx, rp):
"""Returns a set() containing the resource class IDs for all resources
currently having an inventory record for the supplied resource provider.
:param ctx: `nova.context.RequestContext` that may be used to grab a DB
connection.
:param rp: Resource provider to query inventory for.
"""
cur_res_sel = sa.select([_INV_TBL.c.resource_class_id]).where(
_INV_TBL.c.resource_provider_id == rp.id)
existing_resources = ctx.session.execute(cur_res_sel).fetchall()
return set([r[0] for r in existing_resources])
def _delete_inventory_from_provider(ctx, rp, to_delete):
"""Deletes any inventory records from the supplied provider and set() of
resource class identifiers.
If there are allocations for any of the inventories to be deleted raise
InventoryInUse exception.
:param ctx: `nova.context.RequestContext` that contains an oslo_db Session
:param rp: Resource provider from which to delete inventory.
:param to_delete: set() containing resource class IDs for records to
delete.
"""
allocation_query = sa.select(
[_ALLOC_TBL.c.resource_class_id.label('resource_class')]).where(
sa.and_(_ALLOC_TBL.c.resource_provider_id == rp.id,
_ALLOC_TBL.c.resource_class_id.in_(to_delete))
).group_by(_ALLOC_TBL.c.resource_class_id)
allocations = ctx.session.execute(allocation_query).fetchall()
if allocations:
resource_classes = ', '.join([_RC_CACHE.string_from_id(alloc[0])
for alloc in allocations])
raise exception.InventoryInUse(resource_classes=resource_classes,
resource_provider=rp.uuid)
del_stmt = _INV_TBL.delete().where(sa.and_(
_INV_TBL.c.resource_provider_id == rp.id,
_INV_TBL.c.resource_class_id.in_(to_delete)))
res = ctx.session.execute(del_stmt)
return res.rowcount
def _add_inventory_to_provider(ctx, rp, inv_list, to_add):
"""Inserts new inventory records for the supplied resource provider.
:param ctx: `nova.context.RequestContext` that contains an oslo_db Session
:param rp: Resource provider to add inventory to.
:param inv_list: InventoryList object
:param to_add: set() containing resource class IDs to search inv_list for
adding to resource provider.
"""
for rc_id in to_add:
rc_str = _RC_CACHE.string_from_id(rc_id)
inv_record = inv_list.find(rc_str)
ins_stmt = _INV_TBL.insert().values(
resource_provider_id=rp.id,
resource_class_id=rc_id,
total=inv_record.total,
reserved=inv_record.reserved,
min_unit=inv_record.min_unit,
max_unit=inv_record.max_unit,
step_size=inv_record.step_size,
allocation_ratio=inv_record.allocation_ratio)
ctx.session.execute(ins_stmt)
def _update_inventory_for_provider(ctx, rp, inv_list, to_update):
"""Updates existing inventory records for the supplied resource provider.
:param ctx: `nova.context.RequestContext` that contains an oslo_db Session
:param rp: Resource provider on which to update inventory.
:param inv_list: InventoryList object
:param to_update: set() containing resource class IDs to search inv_list
for updating in resource provider.
:returns: A list of (uuid, class) tuples that have exceeded their
capacity after this inventory update.
"""
exceeded = []
for rc_id in to_update:
rc_str = _RC_CACHE.string_from_id(rc_id)
inv_record = inv_list.find(rc_str)
allocation_query = sa.select(
[func.sum(_ALLOC_TBL.c.used).label('usage')]).\
where(sa.and_(
_ALLOC_TBL.c.resource_provider_id == rp.id,
_ALLOC_TBL.c.resource_class_id == rc_id))
allocations = ctx.session.execute(allocation_query).first()
if (allocations
and allocations['usage'] is not None
and allocations['usage'] > inv_record.capacity):
exceeded.append((rp.uuid, rc_str))
upd_stmt = _INV_TBL.update().where(sa.and_(
_INV_TBL.c.resource_provider_id == rp.id,
_INV_TBL.c.resource_class_id == rc_id)).values(
total=inv_record.total,
reserved=inv_record.reserved,
min_unit=inv_record.min_unit,
max_unit=inv_record.max_unit,
step_size=inv_record.step_size,
allocation_ratio=inv_record.allocation_ratio)
res = ctx.session.execute(upd_stmt)
if not res.rowcount:
raise exception.InventoryWithResourceClassNotFound(
resource_class=rc_str)
return exceeded
def _increment_provider_generation(ctx, rp):
"""Increments the supplied provider's generation value, supplying the
currently-known generation. Returns whether the increment succeeded.
:param ctx: `nova.context.RequestContext` that contains an oslo_db Session
:param rp: `ResourceProvider` whose generation should be updated.
:returns: The new resource provider generation value if successful.
:raises nova.exception.ConcurrentUpdateDetected: if another thread updated
the same resource provider's view of its inventory or allocations
in between the time when this object was originally read
and the call to set the inventory.
"""
rp_gen = rp.generation
new_generation = rp_gen + 1
upd_stmt = _RP_TBL.update().where(sa.and_(
_RP_TBL.c.id == rp.id,
_RP_TBL.c.generation == rp_gen)).values(
generation=(new_generation))
res = ctx.session.execute(upd_stmt)
if res.rowcount != 1:
raise exception.ConcurrentUpdateDetected
return new_generation
@db_api.placement_context_manager.writer
def _add_inventory(context, rp, inventory):
"""Add one Inventory that wasn't already on the provider.
:raises `exception.ResourceClassNotFound` if inventory.resource_class
cannot be found in either the standard classes or the DB.
"""
_ensure_rc_cache(context)
rc_id = _RC_CACHE.id_from_string(inventory.resource_class)
inv_list = InventoryList(objects=[inventory])
_add_inventory_to_provider(
context, rp, inv_list, set([rc_id]))
rp.generation = _increment_provider_generation(context, rp)
@db_api.placement_context_manager.writer
def _update_inventory(context, rp, inventory):
"""Update an inventory already on the provider.
:raises `exception.ResourceClassNotFound` if inventory.resource_class
cannot be found in either the standard classes or the DB.
"""
_ensure_rc_cache(context)
rc_id = _RC_CACHE.id_from_string(inventory.resource_class)
inv_list = InventoryList(objects=[inventory])
exceeded = _update_inventory_for_provider(
context, rp, inv_list, set([rc_id]))
rp.generation = _increment_provider_generation(context, rp)
return exceeded
@db_api.placement_context_manager.writer
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 either the standard classes or the DB.
"""
_ensure_rc_cache(context)
rc_id = _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.generation = _increment_provider_generation(context, rp)
@db_api.placement_context_manager.writer
def _set_inventory(context, rp, inv_list):
"""Given an InventoryList object, replaces the inventory of the
resource provider in a safe, atomic fashion using the resource
provider's generation as a consistent view marker.
:param context: Nova RequestContext.
:param rp: `ResourceProvider` object upon which to set inventory.
:param inv_list: `InventoryList` object to save to backend storage.
:returns: A list of (uuid, class) tuples that have exceeded their
capacity after this inventory update.
:raises nova.exception.ConcurrentUpdateDetected: if another thread updated
the same resource provider's view of its inventory or allocations
in between the time when this object was originally read
and the call to set the inventory.
:raises `exception.ResourceClassNotFound` if any resource class in any
inventory in inv_list cannot be found in either the standard
classes or the DB.
:raises `exception.InventoryInUse` if we attempt to delete inventory
from a provider that has allocations for that resource class.
"""
_ensure_rc_cache(context)
existing_resources = _get_current_inventory_resources(context, rp)
these_resources = set([_RC_CACHE.id_from_string(r.resource_class)
for r in inv_list.objects])
# Determine which resources we should be adding, deleting and/or
# updating in the resource provider's inventory by comparing sets
# of resource class identifiers.
to_add = these_resources - existing_resources
to_delete = existing_resources - these_resources
to_update = these_resources & existing_resources
exceeded = []
if to_delete:
_delete_inventory_from_provider(context, rp, to_delete)
if to_add:
_add_inventory_to_provider(context, rp, inv_list, to_add)
if to_update:
exceeded = _update_inventory_for_provider(context, rp, inv_list,
to_update)
# Here is where we update the resource provider's generation value. If
# this update updates zero rows, that means that another thread has updated
# the inventory for this resource provider between the time the caller
# originally read the resource provider record and inventory information
# and this point. We raise an exception here which will rollback the above
# transaction and return an error to the caller to indicate that they can
# attempt to retry the inventory save after reverifying any capacity
# conditions and re-reading the existing inventory information.
rp.generation = _increment_provider_generation(context, rp)
return exceeded
@db_api.placement_context_manager.reader
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")
# TODO(jaypipes): Change this to an inner join when we are sure all
# root_provider_id values are NOT NULL
rp_to_root = sa.outerjoin(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)
@db_api.placement_context_manager.reader
def _get_aggregates_by_provider_id(context, rp_id):
join_statement = sa.join(
_AGG_TBL, _RP_AGG_TBL, sa.and_(
_AGG_TBL.c.id == _RP_AGG_TBL.c.aggregate_id,
_RP_AGG_TBL.c.resource_provider_id == rp_id))
sel = sa.select([_AGG_TBL.c.uuid]).select_from(join_statement)
return [r[0] for r in context.session.execute(sel).fetchall()]
@db_api.placement_context_manager.reader
def _anchors_for_sharing_providers(context, rp_ids, get_id=False):
"""Given a list of internal IDs of sharing providers, returns a set of
tuples of (sharing provider UUID, anchor provider UUID), where each of
anchor is the unique root provider of a tree associated with the same
aggregate as the sharing provider. (These are the providers that can
"anchor" a single AllocationRequest.)
The sharing provider may or may not itself be part of a tree; in either
case, an entry for this root provider is included in the result.
If the sharing provider is not part of any aggregate, the empty list is
returned.
If get_id is True, it returns a set of tuples of (sharing provider ID,
anchor provider ID) instead.
"""
# SELECT sps.uuid, COALESCE(rps.uuid, shr_with_sps.uuid)
# FROM resource_providers AS sps
# INNER JOIN resource_provider_aggregates AS shr_aggs
# ON sps.id = shr_aggs.resource_provider_id
# INNER JOIN resource_provider_aggregates AS shr_with_sps_aggs
# ON shr_aggs.aggregate_id = shr_with_sps_aggs.aggregate_id
# INNER JOIN resource_providers AS shr_with_sps
# ON shr_with_sps_aggs.resource_provider_id = shr_with_sps.id
# LEFT JOIN resource_providers AS rps
# ON shr_with_sps.root_provider_id = rps.id
# WHERE sps.id IN $(RP_IDs)
# GROUP by shr_with_sps.root_provider_id
rps = sa.alias(_RP_TBL, name='rps')
sps = sa.alias(_RP_TBL, name='sps')
shr_aggs = sa.alias(_RP_AGG_TBL, name='shr_aggs')
shr_with_sps_aggs = sa.alias(_RP_AGG_TBL, name='shr_with_sps_aggs')
shr_with_sps = sa.alias(_RP_TBL, name='shr_with_sps')
join_chain = sa.join(
sps, shr_aggs, sps.c.id == shr_aggs.c.resource_provider_id)
join_chain = sa.join(
join_chain, shr_with_sps_aggs,
shr_aggs.c.aggregate_id == shr_with_sps_aggs.c.aggregate_id)
join_chain = sa.join(
join_chain, shr_with_sps,
shr_with_sps_aggs.c.resource_provider_id == shr_with_sps.c.id)
# TODO(efried): Change this to an inner join when we are sure all
# root_provider_id values are NOT NULL
join_chain = sa.outerjoin(
join_chain, rps, shr_with_sps.c.root_provider_id == rps.c.id)
if get_id:
sel = sa.select([sps.c.id, func.coalesce(rps.c.id, shr_with_sps.c.id)])
else:
sel = sa.select([sps.c.uuid, func.coalesce(rps.c.uuid,
shr_with_sps.c.uuid)])
sel = sel.select_from(join_chain)
sel = sel.where(sps.c.id.in_(rp_ids))
return set([(r[0], r[1]) for r in context.session.execute(sel).fetchall()])
@db_api.placement_context_manager.writer
def _set_aggregates(context, resource_provider, provided_aggregates,
increment_generation=False):
rp_id = resource_provider.id
# When aggregate uuids are persisted no validation is done
# to ensure that they refer to something that has meaning
# elsewhere. It is assumed that code which makes use of the
# aggregates, later, will validate their fitness.
# TODO(cdent): At the moment we do not delete
# a PlacementAggregate that no longer has any associations
# with at least one resource provider. We may wish to do that
# to avoid bloat if it turns out we're creating a lot of noise.
# Not doing now to move things along.
provided_aggregates = set(provided_aggregates)
existing_aggregates = set(_get_aggregates_by_provider_id(context, rp_id))
to_add = provided_aggregates - existing_aggregates
target_aggregates = list(provided_aggregates)
# Create any aggregates that do not yet exist in
# PlacementAggregates. This is different from
# the set in existing_aggregates; those are aggregates for
# which there are associations for the resource provider
# at rp_id. The following loop checks for the existence of any
# aggregate with the provided uuid. In this way we only
# create a new row in the PlacementAggregate table if the
# aggregate uuid has never been seen before. Code further
# below will update the associations.
for agg_uuid in to_add:
found_agg = context.session.query(models.PlacementAggregate.uuid).\
filter_by(uuid=agg_uuid).first()
if not found_agg:
new_aggregate = models.PlacementAggregate(uuid=agg_uuid)
try:
context.session.add(new_aggregate)
# Flush each aggregate to explicitly call the INSERT
# statement that could result in an integrity error
# if some other thread has added this agg_uuid. This
# also makes sure that the new aggregates have
# ids when the SELECT below happens.
context.session.flush()
except db_exc.DBDuplicateEntry:
# Something else has already added this agg_uuid
pass
# Remove all aggregate associations so we can refresh them
# below. This means that all associations are added, but the
# aggregates themselves stay around.
context.session.query(models.ResourceProviderAggregate).filter_by(
resource_provider_id=rp_id).delete()
# Set resource_provider_id, aggregate_id pairs to
# ResourceProviderAggregate table.
if target_aggregates:
select_agg_id = sa.select([rp_id, models.PlacementAggregate.id]).\
where(models.PlacementAggregate.uuid.in_(target_aggregates))
insert_aggregates = models.ResourceProviderAggregate.__table__.\
insert().from_select(['resource_provider_id', 'aggregate_id'],
select_agg_id)
context.session.execute(insert_aggregates)
if increment_generation:
resource_provider.generation = _increment_provider_generation(
context, resource_provider)
@db_api.placement_context_manager.reader
def _get_traits_by_provider_id(context, rp_id):
t = sa.alias(_TRAIT_TBL, name='t')
rpt = sa.alias(_RP_TRAIT_TBL, name='rpt')
join_cond = sa.and_(t.c.id == rpt.c.trait_id,
rpt.c.resource_provider_id == rp_id)
join = sa.join(t, rpt, join_cond)
sel = sa.select([t.c.id, t.c.name,
t.c.created_at, t.c.updated_at]).select_from(join)
return [dict(r) for r in context.session.execute(sel).fetchall()]
def _add_traits_to_provider(ctx, rp_id, to_add):
"""Adds trait associations to the provider with the supplied ID.
:param ctx: `nova.context.RequestContext` that has an oslo_db Session
:param rp_id: Internal ID of the resource provider on which to add
trait associations
:param to_add: set() containing internal trait IDs for traits to add
"""
for trait_id in to_add:
try:
ins_stmt = _RP_TRAIT_TBL.insert().values(
resource_provider_id=rp_id,
trait_id=trait_id)
ctx.session.execute(ins_stmt)
except db_exc.DBDuplicateEntry:
# Another thread already set this trait for this provider. Ignore
# this for now (but ConcurrentUpdateDetected will end up being
# raised almost assuredly when we go to increment the resource
# provider's generation later, but that's also fine)
pass
def _delete_traits_from_provider(ctx, rp_id, to_delete):
"""Deletes trait associations from the provider with the supplied ID and
set() of internal trait IDs.
:param ctx: `nova.context.RequestContext` that has an oslo_db Session
:param rp_id: Internal ID of the resource provider from which to delete
trait associations
:param to_delete: set() containing internal trait IDs for traits to
delete
"""
del_stmt = _RP_TRAIT_TBL.delete().where(
sa.and_(
_RP_TRAIT_TBL.c.resource_provider_id == rp_id,
_RP_TRAIT_TBL.c.trait_id.in_(to_delete)))
ctx.session.execute(del_stmt)
@db_api.placement_context_manager.writer
def _set_traits(context, rp, traits):
"""Given a ResourceProvider object and a TraitList object, replaces the set
of traits associated with the resource provider.
:raises: ConcurrentUpdateDetected if the resource provider's traits or
inventory was changed in between the time when we first started to
set traits and the end of this routine.
:param rp: The ResourceProvider object to set traits against
:param traits: A TraitList object or list of Trait objects
"""
# Get the internal IDs of our existing traits
existing_traits = _get_traits_by_provider_id(context, rp.id)
existing_traits = set(rec['id'] for rec in existing_traits)
want_traits = set(trait.id for trait in traits)
to_add = want_traits - existing_traits
to_delete = existing_traits - want_traits
if not to_add and not to_delete:
return
if to_delete:
_delete_traits_from_provider(context, rp.id, to_delete)
if to_add:
_add_traits_to_provider(context, rp.id, to_add)
rp.generation = _increment_provider_generation(context, rp)
@db_api.placement_context_manager.reader
def _has_child_providers(context, rp_id):
"""Returns True if the supplied resource provider has any child providers,
False otherwise
"""
child_sel = sa.select([_RP_TBL.c.id])
child_sel = child_sel.where(_RP_TBL.c.parent_provider_id == rp_id)
child_res = context.session.execute(child_sel.limit(1)).fetchone()
if child_res:
return True
return False
@db_api.placement_context_manager.writer
def _set_root_provider_id(context, rp_id, root_id):
"""Simply sets the root_provider_id value for a provider identified by
rp_id. Used in online data migration.
:param rp_id: Internal ID of the provider to update
:param root_id: Value to set root provider to
"""
upd = _RP_TBL.update().where(_RP_TBL.c.id == rp_id)
upd = upd.values(root_provider_id=root_id)
context.session.execute(upd)
ProviderIds = collections.namedtuple(
'ProviderIds', 'id uuid parent_id parent_uuid root_id root_uuid')
def _provider_ids_from_uuid(context, uuid):
"""Given the UUID of a resource provider, returns a namedtuple
(ProviderIds) with the internal ID, the UUID, the parent provider's
internal ID, parent provider's UUID, the root provider's internal ID and
the root provider UUID.
:returns: ProviderIds object containing the internal IDs and UUIDs of the
provider identified by the supplied UUID
:param uuid: The UUID of the provider to look up
"""
# SELECT
# rp.id, rp.uuid,
# parent.id AS parent_id, parent.uuid AS parent_uuid,
# root.id AS root_id, root.uuid AS root_uuid
# FROM resource_providers AS rp
# LEFT JOIN resource_providers AS parent
# ON rp.parent_provider_id = parent.id
# LEFT JOIN resource_providers AS root
# ON rp.root_provider_id = root.id
me = sa.alias(_RP_TBL, name="me")
parent = sa.alias(_RP_TBL, name="parent")
root = sa.alias(_RP_TBL, name="root")
cols = [
me.c.id,
me.c.uuid,
parent.c.id.label('parent_id'),
parent.c.uuid.label('parent_uuid'),
root.c.id.label('root_id'),
root.c.uuid.label('root_uuid'),
]
# TODO(jaypipes): Change this to an inner join when we are sure all
# root_provider_id values are NOT NULL
me_to_root = sa.outerjoin(me, root, me.c.root_provider_id == root.c.id)
me_to_parent = sa.outerjoin(me_to_root, parent,
me.c.parent_provider_id == parent.c.id)
sel = sa.select(cols).select_from(me_to_parent)
sel = sel.where(me.c.uuid == uuid)
res = context.session.execute(sel).fetchone()
if not res:
return None
return ProviderIds(**dict(res))
def _provider_ids_matching_aggregates(context, member_of, rp_ids=None):
"""Given a list of lists of aggregate UUIDs, return the internal IDs of all
resource providers associated with the aggregates.
:param member_of: A list containing lists of aggregate UUIDs. Each item in
the outer list is to be AND'd together. If that item contains multiple
values, they are OR'd together.
For example, if member_of is::
[
['agg1'],
['agg2', 'agg3'],
]
we will return all the resource providers that are
associated with agg1 as well as either (agg2 or agg3)
:param rp_ids: When present, returned resource providers are limited
to only those in this value
:returns: A list of internal resource provider IDs having all required
aggregate associations
"""
# Given a request for the following:
#
# member_of = [
# [agg1],
# [agg2],
# [agg3, agg4]
# ]
#
# we need to produce the following SQL expression:
#
# SELECT
# rp.id
# FROM resource_providers AS rp
# JOIN resource_provider_aggregates AS rpa1
# ON rp.id = rpa1.resource_provider_id
# AND rpa1.aggregate_id IN ($AGG1_ID)
# JOIN resource_provider_aggregates AS rpa2
# ON rp.id = rpa2.resource_provider_id
# AND rpa2.aggregate_id IN ($AGG2_ID)
# JOIN resource_provider_aggregates AS rpa3
# ON rp.id = rpa3.resource_provider_id
# AND rpa3.aggregate_id IN ($AGG3_ID, $AGG4_ID)
# # Only if we have rp_ids...
# WHERE rp.id IN ($RP_IDs)
# First things first, get a map of all the aggregate UUID to internal
# aggregate IDs
agg_uuids = set()
for members in member_of:
for member in members:
agg_uuids.add(member)
agg_tbl = sa.alias(_AGG_TBL, name='aggs')
agg_sel = sa.select([agg_tbl.c.uuid, agg_tbl.c.id])
agg_sel = agg_sel.where(agg_tbl.c.uuid.in_(agg_uuids))
agg_uuid_map = {
r[0]: r[1] for r in context.session.execute(agg_sel).fetchall()
}
rp_tbl = sa.alias(_RP_TBL, name='rp')
join_chain = rp_tbl
for x, members in enumerate(member_of):
rpa_tbl = sa.alias(_RP_AGG_TBL, name='rpa%d' % x)
agg_ids = [agg_uuid_map[member] for member in members
if member in agg_uuid_map]
if not agg_ids:
# This member_of list contains only non-existent aggregate UUIDs
# and therefore we will always return 0 results, so short-circuit
return []
join_cond = sa.and_(
rp_tbl.c.id == rpa_tbl.c.resource_provider_id,
rpa_tbl.c.aggregate_id.in_(agg_ids))
join_chain = sa.join(join_chain, rpa_tbl, join_cond)
sel = sa.select([rp_tbl.c.id]).select_from(join_chain)
if rp_ids:
sel = sel.where(rp_tbl.c.id.in_(rp_ids))
return [r[0] for r in context.session.execute(sel).fetchall()]
@db_api.placement_context_manager.writer
def _delete_rp_record(context, _id):
return context.session.query(models.ResourceProvider).\
filter(models.ResourceProvider.id == _id).\
delete(synchronize_session=False)
@base.VersionedObjectRegistry.register_if(False)
class ResourceProvider(base.VersionedObject, base.TimestampedObject):
SETTABLE_FIELDS = ('name', 'parent_provider_uuid')
fields = {
'id': fields.IntegerField(read_only=True),
'uuid': fields.UUIDField(nullable=False),
'name': fields.StringField(nullable=False),
'generation': fields.IntegerField(nullable=False),
# UUID of the root provider in a hierarchy of providers. Will be equal
# to the uuid field if this provider is the root provider of a
# hierarchy. This field is never manually set by the user. Instead, it
# is automatically set to either the root provider UUID of the parent
# or the UUID of the provider itself if there is no parent. This field
# is an optimization field that allows us to very quickly query for all
# providers within a particular tree without doing any recursive
# querying.
'root_provider_uuid': fields.UUIDField(nullable=False),
# UUID of the direct parent provider, or None if this provider is a
# "root" provider.
'parent_provider_uuid': fields.UUIDField(nullable=True, default=None),
}
def create(self):
if 'id' in self:
raise exception.ObjectActionError(action='create',
reason='already created')
if 'uuid' not in self:
raise exception.ObjectActionError(action='create',
reason='uuid is required')
if 'name' not in self:
raise exception.ObjectActionError(action='create',
reason='name is required')
if 'root_provider_uuid' in self:
raise exception.ObjectActionError(
action='create',
reason=_('root provider UUID cannot be manually set.'))
self.obj_set_defaults()
updates = self.obj_get_changes()
self._create_in_db(self._context, updates)
self.obj_reset_changes()
def destroy(self):
self._delete(self._context, self.id)
def save(self):
updates = self.obj_get_changes()
if updates and any(k not in self.SETTABLE_FIELDS
for k in updates.keys()):
raise exception.ObjectActionError(
action='save',
reason='Immutable fields changed')
self._update_in_db(self._context, self.id, updates)
self.obj_reset_changes()
@classmethod
def get_by_uuid(cls, context, uuid):
"""Returns a new ResourceProvider object with the supplied UUID.
:raises NotFound if no such provider could be found
:param uuid: UUID of the provider to search for
"""
rp_rec = _get_provider_by_uuid(context, uuid)
return cls._from_db_object(context, cls(), rp_rec)
def add_inventory(self, inventory):
"""Add one new Inventory to the resource provider.
Fails if Inventory of the provided resource class is
already present.
"""
_add_inventory(self._context, self, inventory)
self.obj_reset_changes()
def delete_inventory(self, resource_class):
"""Delete Inventory of provided resource_class."""
_delete_inventory(self._context, self, resource_class)
self.obj_reset_changes()
def set_inventory(self, inv_list):
"""Set all resource provider Inventory to be the provided list."""
exceeded = _set_inventory(self._context, self, inv_list)
for uuid, rclass in exceeded:
LOG.warning('Resource provider %(uuid)s is now over-'
'capacity for %(resource)s',
{'uuid': uuid, 'resource': rclass})
self.obj_reset_changes()
def update_inventory(self, inventory):
"""Update one existing Inventory of the same resource class.
Fails if no Inventory of the same class is present.
"""
exceeded = _update_inventory(self._context, self, inventory)
for uuid, rclass in exceeded:
LOG.warning('Resource provider %(uuid)s is now over-'
'capacity for %(resource)s',
{'uuid': uuid, 'resource': rclass})
self.obj_reset_changes()
def get_aggregates(self):
"""Get the aggregate uuids associated with this resource provider."""
return _get_aggregates_by_provider_id(self._context, self.id)
def set_aggregates(self, aggregate_uuids, increment_generation=False):
"""Set the aggregate uuids associated with this resource provider.
If an aggregate does not exist, one will be created using the
provided uuid.
The resource provider generation is incremented if and only if the
increment_generation parameter is True.
"""
_set_aggregates(self._context, self, aggregate_uuids,
increment_generation=increment_generation)
def set_traits(self, traits):
"""Replaces the set of traits associated with the resource provider
with the given list of Trait objects.
:param traits: A list of Trait objects representing the traits to
associate with the provider.
"""
_set_traits(self._context, self, traits)
self.obj_reset_changes()
@db_api.placement_context_manager.writer
def _create_in_db(self, context, updates):
parent_id = None
root_id = None
# User supplied a parent, let's make sure it exists
parent_uuid = updates.pop('parent_provider_uuid')
if parent_uuid is not None:
# Setting parent to ourselves doesn't make any sense
if parent_uuid == self.uuid:
raise exception.ObjectActionError(
action='create',
reason=_('parent provider UUID cannot be same as '
'UUID. Please set parent provider UUID to '
'None if there is no parent.'))
parent_ids = _provider_ids_from_uuid(context, parent_uuid)
if parent_ids is None:
raise exception.ObjectActionError(
action='create',
reason=_('parent provider UUID does not exist.'))
parent_id = parent_ids.id
root_id = parent_ids.root_id
updates['root_provider_id'] = root_id
updates['parent_provider_id'] = parent_id
self.root_provider_uuid = parent_ids.root_uuid
db_rp = models.ResourceProvider()
db_rp.update(updates)
context.session.add(db_rp)
context.session.flush()
self.id = db_rp.id
self.generation = db_rp.generation
if root_id is None:
# User did not specify a parent when creating this provider, so the
# root_provider_id needs to be set to this provider's newly-created
# internal ID
db_rp.root_provider_id = db_rp.id
context.session.add(db_rp)
context.session.flush()
self.root_provider_uuid = self.uuid
@staticmethod
@db_api.placement_context_manager.writer
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
context.session.query(models.Inventory).\
filter(models.Inventory.resource_provider_id == _id).\
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