# 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.

"""Defines interface for DB access.

The underlying driver is loaded as a :class:`LazyPluggable`.

Functions in this module are imported into the cinder.db namespace. Call these
functions from cinder.db namespace, not the cinder.db.api namespace.

All functions in this module return objects that implement a dictionary-like
interface. Currently, many of these objects are sqlalchemy objects that
implement a dictionary interface. However, a future goal is to have all of
these objects be simple dictionaries.


**Related Flags**

:backend:  string to lookup in the list of LazyPluggable backends.
           `sqlalchemy` is the only supported backend right now.

:connection:  string specifying the sqlalchemy connection to use, like:
              `sqlite:///var/lib/cinder/cinder.sqlite`.

:enable_new_services:  when adding a new service to the database, is it in the
                       pool of available hardware (Default: True)

"""

from oslo.config import cfg
from oslo.db import concurrency as db_concurrency
from oslo.db import options as db_options


db_opts = [
    # TODO(rpodolyaka): this option is deprecated but still passed to
    #                   LazyPluggable class which doesn't support retrieving
    #                   of options put into groups. Nova's version of this
    #                   class supports this. Perhaps, we should put it to Oslo
    #                   and then reuse here.
    cfg.StrOpt('db_backend',
               default='sqlalchemy',
               help='The backend to use for db'),
    cfg.BoolOpt('enable_new_services',
                default=True,
                help='Services to be added to the available pool on create'),
    cfg.StrOpt('volume_name_template',
               default='volume-%s',
               help='Template string to be used to generate volume names'),
    cfg.StrOpt('snapshot_name_template',
               default='snapshot-%s',
               help='Template string to be used to generate snapshot names'),
    cfg.StrOpt('backup_name_template',
               default='backup-%s',
               help='Template string to be used to generate backup names'), ]


CONF = cfg.CONF
CONF.register_opts(db_opts)
db_options.set_defaults(CONF)
CONF.set_default('sqlite_db', 'cinder.sqlite', group='database')

_BACKEND_MAPPING = {'sqlalchemy': 'cinder.db.sqlalchemy.api'}


IMPL = db_concurrency.TpoolDbapiWrapper(CONF, _BACKEND_MAPPING)


###################


def service_destroy(context, service_id):
    """Destroy the service or raise if it does not exist."""
    return IMPL.service_destroy(context, service_id)


def service_get(context, service_id):
    """Get a service or raise if it does not exist."""
    return IMPL.service_get(context, service_id)


def service_get_by_host_and_topic(context, host, topic):
    """Get a service by host it's on and topic it listens to."""
    return IMPL.service_get_by_host_and_topic(context, host, topic)


def service_get_all(context, disabled=None):
    """Get all services."""
    return IMPL.service_get_all(context, disabled)


def service_get_all_by_topic(context, topic, disabled=None):
    """Get all services for a given topic."""
    return IMPL.service_get_all_by_topic(context, topic, disabled=disabled)


def service_get_all_by_host(context, host):
    """Get all services for a given host."""
    return IMPL.service_get_all_by_host(context, host)


def service_get_all_volume_sorted(context):
    """Get all volume services sorted by volume count.

    :returns: a list of (Service, volume_count) tuples.

    """
    return IMPL.service_get_all_volume_sorted(context)


def service_get_by_args(context, host, binary):
    """Get the state of an service by node name and binary."""
    return IMPL.service_get_by_args(context, host, binary)


def service_create(context, values):
    """Create a service from the values dictionary."""
    return IMPL.service_create(context, values)


def service_update(context, service_id, values):
    """Set the given properties on an service and update it.

    Raises NotFound if service does not exist.

    """
    return IMPL.service_update(context, service_id, values)


###################


def iscsi_target_count_by_host(context, host):
    """Return count of export devices."""
    return IMPL.iscsi_target_count_by_host(context, host)


def iscsi_target_create_safe(context, values):
    """Create an iscsi_target from the values dictionary.

    The device is not returned. If the create violates the unique
    constraints because the iscsi_target and host already exist,
    no exception is raised.

    """
    return IMPL.iscsi_target_create_safe(context, values)


###############

def volume_allocate_iscsi_target(context, volume_id, host):
    """Atomically allocate a free iscsi_target from the pool."""
    return IMPL.volume_allocate_iscsi_target(context, volume_id, host)


def volume_attached(context, volume_id, instance_id, host_name, mountpoint):
    """Ensure that a volume is set as attached."""
    return IMPL.volume_attached(context, volume_id, instance_id, host_name,
                                mountpoint)


def volume_create(context, values):
    """Create a volume from the values dictionary."""
    return IMPL.volume_create(context, values)


def volume_data_get_for_host(context, host, count_only=False):
    """Get (volume_count, gigabytes) for project."""
    return IMPL.volume_data_get_for_host(context,
                                         host,
                                         count_only)


def volume_data_get_for_project(context, project_id):
    """Get (volume_count, gigabytes) for project."""
    return IMPL.volume_data_get_for_project(context, project_id)


def finish_volume_migration(context, src_vol_id, dest_vol_id):
    """Perform database updates upon completion of volume migration."""
    return IMPL.finish_volume_migration(context, src_vol_id, dest_vol_id)


def volume_destroy(context, volume_id):
    """Destroy the volume or raise if it does not exist."""
    return IMPL.volume_destroy(context, volume_id)


def volume_detached(context, volume_id):
    """Ensure that a volume is set as detached."""
    return IMPL.volume_detached(context, volume_id)


def volume_get(context, volume_id):
    """Get a volume or raise if it does not exist."""
    return IMPL.volume_get(context, volume_id)


def volume_get_all(context, marker, limit, sort_key, sort_dir,
                   filters=None):
    """Get all volumes."""
    return IMPL.volume_get_all(context, marker, limit, sort_key, sort_dir,
                               filters=filters)


def volume_get_all_by_host(context, host):
    """Get all volumes belonging to a host."""
    return IMPL.volume_get_all_by_host(context, host)


def volume_get_all_by_group(context, group_id):
    """Get all volumes belonging to a consistency group."""
    return IMPL.volume_get_all_by_group(context, group_id)


def volume_get_all_by_project(context, project_id, marker, limit, sort_key,
                              sort_dir, filters=None):
    """Get all volumes belonging to a project."""
    return IMPL.volume_get_all_by_project(context, project_id, marker, limit,
                                          sort_key, sort_dir, filters=filters)


def volume_get_iscsi_target_num(context, volume_id):
    """Get the target num (tid) allocated to the volume."""
    return IMPL.volume_get_iscsi_target_num(context, volume_id)


def volume_update(context, volume_id, values):
    """Set the given properties on an volume and update it.

    Raises NotFound if volume does not exist.

    """
    return IMPL.volume_update(context, volume_id, values)


####################


def snapshot_create(context, values):
    """Create a snapshot from the values dictionary."""
    return IMPL.snapshot_create(context, values)


def snapshot_destroy(context, snapshot_id):
    """Destroy the snapshot or raise if it does not exist."""
    return IMPL.snapshot_destroy(context, snapshot_id)


def snapshot_get(context, snapshot_id):
    """Get a snapshot or raise if it does not exist."""
    return IMPL.snapshot_get(context, snapshot_id)


def snapshot_get_all(context):
    """Get all snapshots."""
    return IMPL.snapshot_get_all(context)


def snapshot_get_all_by_project(context, project_id):
    """Get all snapshots belonging to a project."""
    return IMPL.snapshot_get_all_by_project(context, project_id)


def snapshot_get_all_for_cgsnapshot(context, project_id):
    """Get all snapshots belonging to a cgsnapshot."""
    return IMPL.snapshot_get_all_for_cgsnapshot(context, project_id)


def snapshot_get_all_for_volume(context, volume_id):
    """Get all snapshots for a volume."""
    return IMPL.snapshot_get_all_for_volume(context, volume_id)


def snapshot_update(context, snapshot_id, values):
    """Set the given properties on an snapshot and update it.

    Raises NotFound if snapshot does not exist.

    """
    return IMPL.snapshot_update(context, snapshot_id, values)


def snapshot_data_get_for_project(context, project_id, volume_type_id=None):
    """Get count and gigabytes used for snapshots for specified project."""
    return IMPL.snapshot_data_get_for_project(context,
                                              project_id,
                                              volume_type_id)


def snapshot_get_active_by_window(context, begin, end=None, project_id=None):
    """Get all the snapshots inside the window.

    Specifying a project_id will filter for a certain project.
    """
    return IMPL.snapshot_get_active_by_window(context, begin, end, project_id)


####################


def snapshot_metadata_get(context, snapshot_id):
    """Get all metadata for a snapshot."""
    return IMPL.snapshot_metadata_get(context, snapshot_id)


def snapshot_metadata_delete(context, snapshot_id, key):
    """Delete the given metadata item."""
    return IMPL.snapshot_metadata_delete(context, snapshot_id, key)


def snapshot_metadata_update(context, snapshot_id, metadata, delete):
    """Update metadata if it exists, otherwise create it."""
    return IMPL.snapshot_metadata_update(context, snapshot_id,
                                         metadata, delete)


####################


def volume_metadata_get(context, volume_id):
    """Get all metadata for a volume."""
    return IMPL.volume_metadata_get(context, volume_id)


def volume_metadata_delete(context, volume_id, key):
    """Delete the given metadata item."""
    return IMPL.volume_metadata_delete(context, volume_id, key)


def volume_metadata_update(context, volume_id, metadata, delete):
    """Update metadata if it exists, otherwise create it."""
    return IMPL.volume_metadata_update(context, volume_id, metadata, delete)


##################


def volume_admin_metadata_get(context, volume_id):
    """Get all administration metadata for a volume."""
    return IMPL.volume_admin_metadata_get(context, volume_id)


def volume_admin_metadata_delete(context, volume_id, key):
    """Delete the given metadata item."""
    return IMPL.volume_admin_metadata_delete(context, volume_id, key)


def volume_admin_metadata_update(context, volume_id, metadata, delete):
    """Update metadata if it exists, otherwise create it."""
    return IMPL.volume_admin_metadata_update(context, volume_id, metadata,
                                             delete)


##################


def volume_type_create(context, values):
    """Create a new volume type."""
    return IMPL.volume_type_create(context, values)


def volume_type_get_all(context, inactive=False):
    """Get all volume types."""
    return IMPL.volume_type_get_all(context, inactive)


def volume_type_get(context, id, inactive=False):
    """Get volume type by id."""
    return IMPL.volume_type_get(context, id, inactive)


def volume_type_get_by_name(context, name):
    """Get volume type by name."""
    return IMPL.volume_type_get_by_name(context, name)


def volume_types_get_by_name_or_id(context, volume_type_list):
    """Get volume types by name or id."""
    return IMPL.volume_types_get_by_name_or_id(context, volume_type_list)


def volume_type_qos_associations_get(context, qos_specs_id, inactive=False):
    """Get volume types that are associated with specific qos specs."""
    return IMPL.volume_type_qos_associations_get(context,
                                                 qos_specs_id,
                                                 inactive)


def volume_type_qos_associate(context, type_id, qos_specs_id):
    """Associate a volume type with specific qos specs."""
    return IMPL.volume_type_qos_associate(context, type_id, qos_specs_id)


def volume_type_qos_disassociate(context, qos_specs_id, type_id):
    """Disassociate a volume type from specific qos specs."""
    return IMPL.volume_type_qos_disassociate(context, qos_specs_id, type_id)


def volume_type_qos_disassociate_all(context, qos_specs_id):
    """Disassociate all volume types from specific qos specs."""
    return IMPL.volume_type_qos_disassociate_all(context,
                                                 qos_specs_id)


def volume_type_qos_specs_get(context, type_id):
    """Get all qos specs for given volume type."""
    return IMPL.volume_type_qos_specs_get(context, type_id)


def volume_type_destroy(context, id):
    """Delete a volume type."""
    return IMPL.volume_type_destroy(context, id)


def volume_get_active_by_window(context, begin, end=None, project_id=None):
    """Get all the volumes inside the window.

    Specifying a project_id will filter for a certain project.
    """
    return IMPL.volume_get_active_by_window(context, begin, end, project_id)


####################


def volume_type_extra_specs_get(context, volume_type_id):
    """Get all extra specs for a volume type."""
    return IMPL.volume_type_extra_specs_get(context, volume_type_id)


def volume_type_extra_specs_delete(context, volume_type_id, key):
    """Delete the given extra specs item."""
    return IMPL.volume_type_extra_specs_delete(context, volume_type_id, key)


def volume_type_extra_specs_update_or_create(context,
                                             volume_type_id,
                                             extra_specs):
    """Create or update volume type extra specs. This adds or modifies the
    key/value pairs specified in the extra specs dict argument
    """
    return IMPL.volume_type_extra_specs_update_or_create(context,
                                                         volume_type_id,
                                                         extra_specs)


###################


def volume_type_encryption_get(context, volume_type_id, session=None):
    return IMPL.volume_type_encryption_get(context, volume_type_id, session)


def volume_type_encryption_delete(context, volume_type_id):
    return IMPL.volume_type_encryption_delete(context, volume_type_id)


def volume_type_encryption_create(context, volume_type_id, encryption_specs):
    return IMPL.volume_type_encryption_create(context, volume_type_id,
                                              encryption_specs)


def volume_type_encryption_update(context, volume_type_id, encryption_specs):
    return IMPL.volume_type_encryption_update(context, volume_type_id,
                                              encryption_specs)


def volume_type_encryption_volume_get(context, volume_type_id, session=None):
    return IMPL.volume_type_encryption_volume_get(context, volume_type_id,
                                                  session)


def volume_encryption_metadata_get(context, volume_id, session=None):
    return IMPL.volume_encryption_metadata_get(context, volume_id, session)


###################


def qos_specs_create(context, values):
    """Create a qos_specs."""
    return IMPL.qos_specs_create(context, values)


def qos_specs_get(context, qos_specs_id):
    """Get all specification for a given qos_specs."""
    return IMPL.qos_specs_get(context, qos_specs_id)


def qos_specs_get_all(context, inactive=False, filters=None):
    """Get all qos_specs."""
    return IMPL.qos_specs_get_all(context, inactive, filters)


def qos_specs_get_by_name(context, name):
    """Get all specification for a given qos_specs."""
    return IMPL.qos_specs_get_by_name(context, name)


def qos_specs_associations_get(context, qos_specs_id):
    """Get all associated volume types for a given qos_specs."""
    return IMPL.qos_specs_associations_get(context, qos_specs_id)


def qos_specs_associate(context, qos_specs_id, type_id):
    """Associate qos_specs from volume type."""
    return IMPL.qos_specs_associate(context, qos_specs_id, type_id)


def qos_specs_disassociate(context, qos_specs_id, type_id):
    """Disassociate qos_specs from volume type."""
    return IMPL.qos_specs_disassociate(context, qos_specs_id, type_id)


def qos_specs_disassociate_all(context, qos_specs_id):
    """Disassociate qos_specs from all entities."""
    return IMPL.qos_specs_disassociate_all(context, qos_specs_id)


def qos_specs_delete(context, qos_specs_id):
    """Delete the qos_specs."""
    return IMPL.qos_specs_delete(context, qos_specs_id)


def qos_specs_item_delete(context, qos_specs_id, key):
    """Delete specified key in the qos_specs."""
    return IMPL.qos_specs_item_delete(context, qos_specs_id, key)


def qos_specs_update(context, qos_specs_id, specs):
    """Update qos specs.

    This adds or modifies the key/value pairs specified in the
    specs dict argument for a given qos_specs.
    """
    return IMPL.qos_specs_update(context, qos_specs_id, specs)


###################


def volume_glance_metadata_create(context, volume_id, key, value):
    """Update the Glance metadata for the specified volume."""
    return IMPL.volume_glance_metadata_create(context,
                                              volume_id,
                                              key,
                                              value)


def volume_glance_metadata_get_all(context):
    """Return the glance metadata for all volumes."""
    return IMPL.volume_glance_metadata_get_all(context)


def volume_glance_metadata_get(context, volume_id):
    """Return the glance metadata for a volume."""
    return IMPL.volume_glance_metadata_get(context, volume_id)


def volume_snapshot_glance_metadata_get(context, snapshot_id):
    """Return the Glance metadata for the specified snapshot."""
    return IMPL.volume_snapshot_glance_metadata_get(context, snapshot_id)


def volume_glance_metadata_copy_to_snapshot(context, snapshot_id, volume_id):
    """Update the Glance metadata for a snapshot.

    This will copy all of the key:value pairs from the originating volume,
    to ensure that a volume created from the snapshot will retain the
    original metadata.
    """
    return IMPL.volume_glance_metadata_copy_to_snapshot(context, snapshot_id,
                                                        volume_id)


def volume_glance_metadata_copy_to_volume(context, volume_id, snapshot_id):
    """Update the Glance metadata from a volume (created from a snapshot).

    This will copy all of the key:value pairs from the originating snapshot,
    to ensure that the Glance metadata from the original volume is retained.
    """
    return IMPL.volume_glance_metadata_copy_to_volume(context, volume_id,
                                                      snapshot_id)


def volume_glance_metadata_delete_by_volume(context, volume_id):
    """Delete the glance metadata for a volume."""
    return IMPL.volume_glance_metadata_delete_by_volume(context, volume_id)


def volume_glance_metadata_delete_by_snapshot(context, snapshot_id):
    """Delete the glance metadata for a snapshot."""
    return IMPL.volume_glance_metadata_delete_by_snapshot(context, snapshot_id)


def volume_glance_metadata_copy_from_volume_to_volume(context,
                                                      src_volume_id,
                                                      volume_id):
    """Update the Glance metadata for a volume by copying all of the key:value
    pairs from the originating volume.

    This is so that a volume created from the volume (clone) will retain the
    original metadata.
    """
    return IMPL.volume_glance_metadata_copy_from_volume_to_volume(
        context,
        src_volume_id,
        volume_id)


###################


def quota_create(context, project_id, resource, limit):
    """Create a quota for the given project and resource."""
    return IMPL.quota_create(context, project_id, resource, limit)


def quota_get(context, project_id, resource):
    """Retrieve a quota or raise if it does not exist."""
    return IMPL.quota_get(context, project_id, resource)


def quota_get_all_by_project(context, project_id):
    """Retrieve all quotas associated with a given project."""
    return IMPL.quota_get_all_by_project(context, project_id)


def quota_update(context, project_id, resource, limit):
    """Update a quota or raise if it does not exist."""
    return IMPL.quota_update(context, project_id, resource, limit)


def quota_destroy(context, project_id, resource):
    """Destroy the quota or raise if it does not exist."""
    return IMPL.quota_destroy(context, project_id, resource)


###################


def quota_class_create(context, class_name, resource, limit):
    """Create a quota class for the given name and resource."""
    return IMPL.quota_class_create(context, class_name, resource, limit)


def quota_class_get(context, class_name, resource):
    """Retrieve a quota class or raise if it does not exist."""
    return IMPL.quota_class_get(context, class_name, resource)


def quota_class_get_default(context):
    """Retrieve all default quotas."""
    return IMPL.quota_class_get_default(context)


def quota_class_get_all_by_name(context, class_name):
    """Retrieve all quotas associated with a given quota class."""
    return IMPL.quota_class_get_all_by_name(context, class_name)


def quota_class_update(context, class_name, resource, limit):
    """Update a quota class or raise if it does not exist."""
    return IMPL.quota_class_update(context, class_name, resource, limit)


def quota_class_destroy(context, class_name, resource):
    """Destroy the quota class or raise if it does not exist."""
    return IMPL.quota_class_destroy(context, class_name, resource)


def quota_class_destroy_all_by_name(context, class_name):
    """Destroy all quotas associated with a given quota class."""
    return IMPL.quota_class_destroy_all_by_name(context, class_name)


###################


def quota_usage_get(context, project_id, resource):
    """Retrieve a quota usage or raise if it does not exist."""
    return IMPL.quota_usage_get(context, project_id, resource)


def quota_usage_get_all_by_project(context, project_id):
    """Retrieve all usage associated with a given resource."""
    return IMPL.quota_usage_get_all_by_project(context, project_id)


###################


def quota_reserve(context, resources, quotas, deltas, expire,
                  until_refresh, max_age, project_id=None):
    """Check quotas and create appropriate reservations."""
    return IMPL.quota_reserve(context, resources, quotas, deltas, expire,
                              until_refresh, max_age, project_id=project_id)


def reservation_commit(context, reservations, project_id=None):
    """Commit quota reservations."""
    return IMPL.reservation_commit(context, reservations,
                                   project_id=project_id)


def reservation_rollback(context, reservations, project_id=None):
    """Roll back quota reservations."""
    return IMPL.reservation_rollback(context, reservations,
                                     project_id=project_id)


def quota_destroy_all_by_project(context, project_id):
    """Destroy all quotas associated with a given project."""
    return IMPL.quota_destroy_all_by_project(context, project_id)


def reservation_expire(context):
    """Roll back any expired reservations."""
    return IMPL.reservation_expire(context)


###################


def backup_get(context, backup_id):
    """Get a backup or raise if it does not exist."""
    return IMPL.backup_get(context, backup_id)


def backup_get_all(context, filters=None):
    """Get all backups."""
    return IMPL.backup_get_all(context, filters=filters)


def backup_get_all_by_host(context, host):
    """Get all backups belonging to a host."""
    return IMPL.backup_get_all_by_host(context, host)


def backup_create(context, values):
    """Create a backup from the values dictionary."""
    return IMPL.backup_create(context, values)


def backup_get_all_by_project(context, project_id, filters=None):
    """Get all backups belonging to a project."""
    return IMPL.backup_get_all_by_project(context, project_id,
                                          filters=filters)


def backup_update(context, backup_id, values):
    """Set the given properties on a backup and update it.

    Raises NotFound if backup does not exist.
    """
    return IMPL.backup_update(context, backup_id, values)


def backup_destroy(context, backup_id):
    """Destroy the backup or raise if it does not exist."""
    return IMPL.backup_destroy(context, backup_id)


###################


def transfer_get(context, transfer_id):
    """Get a volume transfer record or raise if it does not exist."""
    return IMPL.transfer_get(context, transfer_id)


def transfer_get_all(context):
    """Get all volume transfer records."""
    return IMPL.transfer_get_all(context)


def transfer_get_all_by_project(context, project_id):
    """Get all volume transfer records for specified project."""
    return IMPL.transfer_get_all_by_project(context, project_id)


def transfer_create(context, values):
    """Create an entry in the transfers table."""
    return IMPL.transfer_create(context, values)


def transfer_destroy(context, transfer_id):
    """Destroy a record in the volume transfer table."""
    return IMPL.transfer_destroy(context, transfer_id)


def transfer_accept(context, transfer_id, user_id, project_id):
    """Accept a volume transfer."""
    return IMPL.transfer_accept(context, transfer_id, user_id, project_id)


###################


def consistencygroup_get(context, consistencygroup_id):
    """Get a consistencygroup or raise if it does not exist."""
    return IMPL.consistencygroup_get(context, consistencygroup_id)


def consistencygroup_get_all(context):
    """Get all consistencygroups."""
    return IMPL.consistencygroup_get_all(context)


def consistencygroup_get_all_by_host(context, host):
    """Get all consistencygroups belonging to a host."""
    return IMPL.consistencygroup_get_all_by_host(context, host)


def consistencygroup_create(context, values):
    """Create a consistencygroup from the values dictionary."""
    return IMPL.consistencygroup_create(context, values)


def consistencygroup_get_all_by_project(context, project_id):
    """Get all consistencygroups belonging to a project."""
    return IMPL.consistencygroup_get_all_by_project(context, project_id)


def consistencygroup_update(context, consistencygroup_id, values):
    """Set the given properties on a consistencygroup and update it.

    Raises NotFound if consistencygroup does not exist.
    """
    return IMPL.consistencygroup_update(context, consistencygroup_id, values)


def consistencygroup_destroy(context, consistencygroup_id):
    """Destroy the consistencygroup or raise if it does not exist."""
    return IMPL.consistencygroup_destroy(context, consistencygroup_id)


###################


def cgsnapshot_get(context, cgsnapshot_id):
    """Get a cgsnapshot or raise if it does not exist."""
    return IMPL.cgsnapshot_get(context, cgsnapshot_id)


def cgsnapshot_get_all(context):
    """Get all cgsnapshots."""
    return IMPL.cgsnapshot_get_all(context)


def cgsnapshot_get_all_by_host(context, host):
    """Get all cgsnapshots belonging to a host."""
    return IMPL.cgsnapshot_get_all_by_host(context, host)


def cgsnapshot_create(context, values):
    """Create a cgsnapshot from the values dictionary."""
    return IMPL.cgsnapshot_create(context, values)


def cgsnapshot_get_all_by_group(context, group_id):
    """Get all cgsnapshots belonging to a consistency group."""
    return IMPL.cgsnapshot_get_all_by_group(context, group_id)


def cgsnapshot_get_all_by_project(context, project_id):
    """Get all cgsnapshots belonging to a project."""
    return IMPL.cgsnapshot_get_all_by_project(context, project_id)


def cgsnapshot_update(context, cgsnapshot_id, values):
    """Set the given properties on a cgsnapshot and update it.

    Raises NotFound if cgsnapshot does not exist.
    """
    return IMPL.cgsnapshot_update(context, cgsnapshot_id, values)


def cgsnapshot_destroy(context, cgsnapshot_id):
    """Destroy the cgsnapshot or raise if it does not exist."""
    return IMPL.cgsnapshot_destroy(context, cgsnapshot_id)
