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api.py
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api.py
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# vim: tabstop=4 shiftwidth=4 softtabstop=4
# 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 datetime
import warnings
from nova import db
from nova import exception
from nova import flags
from nova import ipv6
from nova import utils
from nova import log as logging
from nova.db.sqlalchemy import models
from nova.db.sqlalchemy.session import get_session
from sqlalchemy import or_
from sqlalchemy.exc import IntegrityError
from sqlalchemy.orm import joinedload
from sqlalchemy.orm import joinedload_all
from sqlalchemy.sql import exists
from sqlalchemy.sql import func
from sqlalchemy.sql.expression import literal_column
FLAGS = flags.FLAGS
LOG = logging.getLogger("nova.db.sqlalchemy")
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 that the request context has permission to access the
given project.
"""
if is_user_context(context):
if not context.project:
raise exception.NotAuthorized()
elif context.project_id != project_id:
raise exception.NotAuthorized()
def authorize_user_context(context, user_id):
"""Ensures that the request context has permission to access the
given user.
"""
if is_user_context(context):
if not context.user:
raise exception.NotAuthorized()
elif context.user_id != user_id:
raise exception.NotAuthorized()
def can_read_deleted(context):
"""Indicates if the context has access to deleted objects."""
if not context:
return False
return context.read_deleted
def require_admin_context(f):
"""Decorator used to indicate that the method requires an
administrator 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 used to indicate that the method requires either
an administrator or normal user context.
"""
def wrapper(*args, **kwargs):
if not is_admin_context(args[0]) and not is_user_context(args[0]):
raise exception.AdminRequired()
return f(*args, **kwargs)
return wrapper
###################
@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 == 'compute' and \
len(service_ref.compute_node) != 0:
for c in service_ref.compute_node:
c.delete(session=session)
@require_admin_context
def service_get(context, service_id, session=None):
if not session:
session = get_session()
result = session.query(models.Service).\
options(joinedload('compute_node')).\
filter_by(id=service_id).\
filter_by(deleted=can_read_deleted(context)).\
first()
if not result:
raise exception.ServiceNotFound(service_id=service_id)
return result
@require_admin_context
def service_get_all(context, disabled=None):
session = get_session()
query = session.query(models.Service).\
filter_by(deleted=can_read_deleted(context))
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):
session = get_session()
return session.query(models.Service).\
filter_by(deleted=False).\
filter_by(disabled=False).\
filter_by(topic=topic).\
all()
@require_admin_context
def service_get_by_host_and_topic(context, host, topic):
session = get_session()
return session.query(models.Service).\
filter_by(deleted=False).\
filter_by(disabled=False).\
filter_by(host=host).\
filter_by(topic=topic).\
first()
@require_admin_context
def service_get_all_by_host(context, host):
session = get_session()
return session.query(models.Service).\
filter_by(deleted=False).\
filter_by(host=host).\
all()
@require_admin_context
def service_get_all_compute_by_host(context, host):
topic = 'compute'
session = get_session()
result = session.query(models.Service).\
options(joinedload('compute_node')).\
filter_by(deleted=False).\
filter_by(host=host).\
filter_by(topic=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 session.query(models.Service, func.coalesce(sort_value, 0)).\
filter_by(topic=topic).\
filter_by(deleted=False).\
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 = 'compute'
label = 'instance_cores'
subq = session.query(models.Instance.host,
func.sum(models.Instance.vcpus).label(label)).\
filter_by(deleted=False).\
group_by(models.Instance.host).\
subquery()
return _service_get_all_topic_subquery(context,
session,
topic,
subq,
label)
@require_admin_context
def service_get_all_network_sorted(context):
session = get_session()
with session.begin():
topic = 'network'
label = 'network_count'
subq = session.query(models.Network.host,
func.count(models.Network.id).label(label)).\
filter_by(deleted=False).\
group_by(models.Network.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 = 'volume'
label = 'volume_gigabytes'
subq = session.query(models.Volume.host,
func.sum(models.Volume.size).label(label)).\
filter_by(deleted=False).\
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):
session = get_session()
result = session.query(models.Service).\
filter_by(host=host).\
filter_by(binary=binary).\
filter_by(deleted=can_read_deleted(context)).\
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)
###################
@require_admin_context
def compute_node_get(context, compute_id, session=None):
if not session:
session = get_session()
result = session.query(models.ComputeNode).\
filter_by(id=compute_id).\
filter_by(deleted=can_read_deleted(context)).\
first()
if not result:
raise exception.ComputeHostNotFound(host=compute_id)
return result
@require_admin_context
def compute_node_create(context, values):
compute_node_ref = models.ComputeNode()
compute_node_ref.update(values)
compute_node_ref.save()
return compute_node_ref
@require_admin_context
def compute_node_update(context, compute_id, values):
session = get_session()
with session.begin():
compute_ref = compute_node_get(context, compute_id, session=session)
compute_ref.update(values)
compute_ref.save(session=session)
###################
@require_admin_context
def certificate_get(context, certificate_id, session=None):
if not session:
session = get_session()
result = session.query(models.Certificate).\
filter_by(id=certificate_id).\
filter_by(deleted=can_read_deleted(context)).\
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_destroy(context, certificate_id):
session = get_session()
with session.begin():
certificate_ref = certificate_get(context,
certificate_id,
session=session)
certificate_ref.delete(session=session)
@require_admin_context
def certificate_get_all_by_project(context, project_id):
session = get_session()
return session.query(models.Certificate).\
filter_by(project_id=project_id).\
filter_by(deleted=False).\
all()
@require_admin_context
def certificate_get_all_by_user(context, user_id):
session = get_session()
return session.query(models.Certificate).\
filter_by(user_id=user_id).\
filter_by(deleted=False).\
all()
@require_admin_context
def certificate_get_all_by_user_and_project(_context, user_id, project_id):
session = get_session()
return session.query(models.Certificate).\
filter_by(user_id=user_id).\
filter_by(project_id=project_id).\
filter_by(deleted=False).\
all()
@require_admin_context
def certificate_update(context, certificate_id, values):
session = get_session()
with session.begin():
certificate_ref = certificate_get(context,
certificate_id,
session=session)
for (key, value) in values.iteritems():
certificate_ref[key] = value
certificate_ref.save(session=session)
###################
@require_context
def floating_ip_allocate_address(context, host, project_id):
authorize_project_context(context, project_id)
session = get_session()
with session.begin():
floating_ip_ref = session.query(models.FloatingIp).\
filter_by(host=host).\
filter_by(fixed_ip_id=None).\
filter_by(project_id=None).\
filter_by(deleted=False).\
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 db.NoMoreAddresses()
floating_ip_ref['project_id'] = project_id
session.add(floating_ip_ref)
return floating_ip_ref['address']
@require_context
def floating_ip_create(context, values):
floating_ip_ref = models.FloatingIp()
floating_ip_ref.update(values)
floating_ip_ref.save()
return floating_ip_ref['address']
@require_context
def floating_ip_count_by_project(context, project_id):
authorize_project_context(context, project_id)
session = get_session()
# TODO(tr3buchet): why leave auto_assigned floating IPs out?
return session.query(models.FloatingIp).\
filter_by(project_id=project_id).\
filter_by(auto_assigned=False).\
filter_by(deleted=False).\
count()
@require_context
def floating_ip_fixed_ip_associate(context, floating_address, fixed_address):
session = get_session()
with session.begin():
# TODO(devcamcar): How to ensure floating_id belongs to user?
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 = fixed_ip_ref
floating_ip_ref.save(session=session)
@require_context
def floating_ip_deallocate(context, address):
session = get_session()
with session.begin():
# TODO(devcamcar): How to ensure floating id belongs to user?
floating_ip_ref = floating_ip_get_by_address(context,
address,
session=session)
floating_ip_ref['project_id'] = 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():
# TODO(devcamcar): Ensure address belongs to user.
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():
# TODO(devcamcar): Ensure address belongs to user.
# Does get_floating_ip_by_address handle this?
floating_ip_ref = floating_ip_get_by_address(context,
address,
session=session)
fixed_ip_ref = floating_ip_ref.fixed_ip
if fixed_ip_ref:
fixed_ip_address = fixed_ip_ref['address']
else:
fixed_ip_address = None
floating_ip_ref.fixed_ip = 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)
@require_admin_context
def floating_ip_get_all(context):
session = get_session()
return session.query(models.FloatingIp).\
options(joinedload_all('fixed_ip.instance')).\
filter_by(deleted=False).\
all()
@require_admin_context
def floating_ip_get_all_by_host(context, host):
session = get_session()
return session.query(models.FloatingIp).\
options(joinedload_all('fixed_ip.instance')).\
filter_by(host=host).\
filter_by(deleted=False).\
all()
@require_context
def floating_ip_get_all_by_project(context, project_id):
authorize_project_context(context, project_id)
session = get_session()
# TODO(tr3buchet): why do we not want auto_assigned floating IPs here?
return session.query(models.FloatingIp).\
options(joinedload_all('fixed_ip.instance')).\
filter_by(project_id=project_id).\
filter_by(auto_assigned=False).\
filter_by(deleted=False).\
all()
@require_context
def floating_ip_get_by_address(context, address, session=None):
# TODO(devcamcar): Ensure the address belongs to user.
if not session:
session = get_session()
result = session.query(models.FloatingIp).\
options(joinedload_all('fixed_ip.network')).\
filter_by(address=address).\
filter_by(deleted=can_read_deleted(context)).\
first()
if not result:
raise exception.FloatingIpNotFound(address=address)
return result
@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 fixed_ip_associate(context, address, instance_id):
session = get_session()
with session.begin():
instance = instance_get(context, instance_id, session=session)
fixed_ip_ref = session.query(models.FixedIp).\
filter_by(address=address).\
filter_by(deleted=False).\
filter_by(instance=None).\
with_lockmode('update').\
first()
# NOTE(vish): if with_lockmode isn't supported, as in sqlite,
# then this has concurrency issues
if not fixed_ip_ref:
raise db.NoMoreAddresses()
fixed_ip_ref.instance = instance
session.add(fixed_ip_ref)
@require_admin_context
def fixed_ip_associate_pool(context, network_id, instance_id):
session = get_session()
with session.begin():
network_or_none = or_(models.FixedIp.network_id == network_id,
models.FixedIp.network_id == None)
fixed_ip_ref = session.query(models.FixedIp).\
filter(network_or_none).\
filter_by(reserved=False).\
filter_by(deleted=False).\
filter_by(instance=None).\
with_lockmode('update').\
first()
# NOTE(vish): if with_lockmode isn't supported, as in sqlite,
# then this has concurrency issues
if not fixed_ip_ref:
raise db.NoMoreAddresses()
if not fixed_ip_ref.network:
fixed_ip_ref.network = network_get(context,
network_id,
session=session)
fixed_ip_ref.instance = instance_get(context,
instance_id,
session=session)
session.add(fixed_ip_ref)
return fixed_ip_ref['address']
@require_context
def fixed_ip_create(_context, values):
fixed_ip_ref = models.FixedIp()
fixed_ip_ref.update(values)
fixed_ip_ref.save()
return fixed_ip_ref['address']
@require_context
def fixed_ip_disassociate(context, address):
session = get_session()
with session.begin():
fixed_ip_ref = fixed_ip_get_by_address(context,
address,
session=session)
fixed_ip_ref.instance = None
fixed_ip_ref.mac_address = None
fixed_ip_ref.save(session=session)
@require_admin_context
def fixed_ip_disassociate_all_by_timeout(_context, host, time):
session = get_session()
inner_q = session.query(models.Network.id).\
filter_by(host=host).\
subquery()
result = session.query(models.FixedIp).\
filter(models.FixedIp.network_id.in_(inner_q)).\
filter(models.FixedIp.updated_at < time).\
filter(models.FixedIp.instance_id != None).\
filter_by(allocated=0).\
update({'instance_id': None,
'mac_address_id': None,
'leased': 0,
'updated_at': datetime.datetime.utcnow()},
synchronize_session='fetch')
return result
@require_admin_context
def fixed_ip_get_all(context, session=None):
if not session:
session = get_session()
result = session.query(models.FixedIp).all()
if not result:
raise exception.NoFixedIpsDefined()
return result
@require_admin_context
def fixed_ip_get_all_by_host(context, host=None):
session = get_session()
result = session.query(models.FixedIp).\
join(models.FixedIp.instance).\
filter_by(state=1).\
filter_by(host=host).\
all()
if not result:
raise exception.NoFixedIpsDefinedForHost(host=host)
return result
@require_context
def fixed_ip_get_by_address(context, address, session=None):
if not session:
session = get_session()
result = session.query(models.FixedIp).\
filter_by(address=address).\
filter_by(deleted=can_read_deleted(context)).\
options(joinedload('network')).\
options(joinedload('instance')).\
first()
if not result:
raise exception.FixedIpNotFound(address=address)
if is_user_context(context):
authorize_project_context(context, result.instance.project_id)
return result
@require_context
def fixed_ip_get_instance(context, address):
fixed_ip_ref = fixed_ip_get_by_address(context, address)
return fixed_ip_ref.instance
@require_context
def fixed_ip_get_all_by_instance(context, instance_id):
session = get_session()
rv = session.query(models.FixedIp).\
filter_by(instance_id=instance_id).\
filter_by(deleted=False).\
all()
if not rv:
raise exception.NoFixedIpsFoundForInstance(instance_id=instance_id)
return rv
@require_context
def fixed_ip_get_by_instance_and_network(context, instance_id,
network_id):
session = get_session()
rv = session.query(models.FixedIp).\
filter_by(instance_id=instance_id).\
filter_by(network_id=network_id).\
filter_by(deleted=False).\
first()
if not rv:
raise exception.NoFixedIpsFoundForInstance(instance_id=instance_id)
return rv
@require_context
def fixed_ip_get_all_by_mac_address(context, mac_address_id):
session = get_session()
rv = session.query(models.FixedIp).\
filter_by(mac_address_id=mac_address_id).\
filter_by(deleted=False).\
all()
if not rv:
raise exception.NoFixedIpFoundForMacAddress(mac_id=mac_id)
return rv
@require_context
def fixed_ip_get_instance_v6(context, address):
session = get_session()
# convert IPv6 address to mac
mac = ipv6.to_mac(address)
# get mac address row
mac_ref = mac_address_get_by_address(context, mac)
# look up instance based on instance_id from mac address row
result = session.query(models.Instance).\
filter_by(id=mac_ref.instance_id)
return result
@require_admin_context
def fixed_ip_get_network(context, address):
fixed_ip_ref = fixed_ip_get_by_address(context, address)
return fixed_ip_ref.network
@require_context
def fixed_ip_update(context, address, values):
session = get_session()
with session.begin():
fixed_ip_ref = fixed_ip_get_by_address(context,
address,
session=session)
fixed_ip_ref.update(values)
fixed_ip_ref.save(session=session)
###################
@require_context
def mac_address_create(context, values):
"""create a new mac address record in teh database
context = request context object
values = dict containing column values
"""
mac_address_ref = models.MacAddress()
mac_address_ref.update(values)
mac_address_ref.save()
return mac_address_ref
@require_context
def mac_address_get(context, mac_address_id):
"""gets a mac address from the table
context = request context object
mac_address_id = id of the mac_address
"""
session = get_session()
with session.begin():
mac_address_ref = session.query(models.MacAddress).\
filter_by(id=mac_address_id).\
options(joinedload('network')).\
options(joinedload('instance')).\
first()
return mac_address_ref
@require_context
def mac_address_get_by_address(context, address):
"""gets a mac address from the table
context = request context object
address = the mac you're looking to get
"""
session = get_session()
with session.begin():
mac_address_ref = session.query(models.MacAddress).\
filter_by(address=address).\
options(joinedload('network')).\
options(joinedload('instance')).\
first()
return mac_address_ref
@require_context
def mac_address_get_by_fixed_ip(context, fixed_ip_id):
"""gets a mac address for a fixed_ip
context = request context object
fixed_ip_id = id of the fixed_ip you're looking to get mac for
"""
session = get_session()
with session.begin():
mac_address_ref = session.query(models.MacAddress).\
filter_by(fixed_ip_id=fixed_ip_id).\
options(joinedload('fixed_ips')).\
options(joinedload('network')).\
options(joinedload('instance')).\
first()
return mac_address_ref
@require_context
def mac_address_get_all_by_instance(context, instance_id):
"""gets all mac addresses for instance
context = request context object
instance_id = instance to retreive macs for
"""
session = get_session()
with session.begin():
mac_address_refs = session.query(models.MacAddress).\
filter_by(instance_id=instance_id).\
options(joinedload('network')).\
options(joinedload('instance')).\
all()
return mac_address_refs
@require_context
def mac_address_get_by_instance_and_network(context, instance_id,
network_id):
"""gets mac address for instance that's associated with network"""
session = get_session()
with session.begin():
mac_address_ref = session.query(models.MacAddress).\
filter_by(instance_id=instance_id).\
filter_by(network_id=network_id).\
options(joinedload('network')).\
options(joinedload('instance')).\
first()
return mac_address_ref
@require_admin_context
def mac_address_get_all_by_network(context, network_id):
"""gets all mac addresses for instance
context = request context object
network_id = network to retreive macs for
"""
session = get_session()
with session.begin():
mac_address_refs = session.query(models.MacAddress).\
filter_by(network_id=network_id).\
options(joinedload('network')).\
options(joinedload('instance')).\
all()
return mac_address_refs
@require_context
def mac_address_delete(context, address):
"""delete mac address record in teh database
context = request context object
instance_id = instance to remove macs for
"""
mac_address = mac_address_get_by_address(address)
session = get_session()
with session.begin():
for fixed_ip in mac_address['fixed_ips']:
fixed_ip.mac_address = None
session.delete(mac_address)
@require_context
def mac_address_delete_by_instance(context, instance_id):
"""delete mac address records in the database that are associated
with the instance given by instance_id
context = request context object
instance_id = instance to remove macs for
"""
refs = mac_address_get_all_by_instance(instance_id)
for ref in refs:
self.mac_address_delete(ref)
###################
@require_context
def instance_create(context, values):
"""Create a new Instance record in the database.
context - request context object
values - dict containing column values.
"""
metadata = values.get('metadata')
metadata_refs = []
if metadata:
for k, v in metadata.iteritems():
metadata_ref = models.InstanceMetadata()
metadata_ref['key'] = k
metadata_ref['value'] = v
metadata_refs.append(metadata_ref)
values['metadata'] = metadata_refs
instance_ref = models.Instance()
instance_ref.update(values)
session = get_session()
with session.begin():
instance_ref.save(session=session)
return instance_ref
@require_admin_context
def instance_data_get_for_project(context, project_id):
session = get_session()
result = session.query(func.count(models.Instance.id),
func.sum(models.Instance.vcpus)).\
filter_by(project_id=project_id).\
filter_by(deleted=False).\
first()
# NOTE(vish): convert None to 0
return (result[0] or 0, result[1] or 0)
@require_context
def instance_destroy(context, instance_id):
session = get_session()
with session.begin():