/usr/share/pyshared/nova/quota.py is in python-nova 2012.1.3+stable-20130423-e52e6912-0ubuntu1.4.
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# 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.
"""Quotas for instances, volumes, and floating ips."""
from nova import db
from nova.openstack.common import cfg
from nova import flags
quota_opts = [
cfg.IntOpt('quota_instances',
default=10,
help='number of instances allowed per project'),
cfg.IntOpt('quota_cores',
default=20,
help='number of instance cores allowed per project'),
cfg.IntOpt('quota_ram',
default=50 * 1024,
help='megabytes of instance ram allowed per project'),
cfg.IntOpt('quota_volumes',
default=10,
help='number of volumes allowed per project'),
cfg.IntOpt('quota_gigabytes',
default=1000,
help='number of volume gigabytes allowed per project'),
cfg.IntOpt('quota_floating_ips',
default=10,
help='number of floating ips allowed per project'),
cfg.IntOpt('quota_fixed_ips',
default=10,
help=('number of fixed ips allowed per project (this should be '
'at least the number of instances allowed)')),
cfg.IntOpt('quota_metadata_items',
default=128,
help='number of metadata items allowed per instance'),
cfg.IntOpt('quota_max_injected_files',
default=5,
help='number of injected files allowed'),
cfg.IntOpt('quota_max_injected_file_content_bytes',
default=10 * 1024,
help='number of bytes allowed per injected file'),
cfg.IntOpt('quota_max_injected_file_path_bytes',
default=255,
help='number of bytes allowed per injected file path'),
cfg.IntOpt('quota_security_groups',
default=10,
help='number of security groups per project'),
cfg.IntOpt('quota_security_group_rules',
default=20,
help='number of security rules per security group'),
]
FLAGS = flags.FLAGS
FLAGS.register_opts(quota_opts)
def _get_default_quotas():
defaults = {
'instances': FLAGS.quota_instances,
'cores': FLAGS.quota_cores,
'ram': FLAGS.quota_ram,
'volumes': FLAGS.quota_volumes,
'gigabytes': FLAGS.quota_gigabytes,
'floating_ips': FLAGS.quota_floating_ips,
'fixed_ips': FLAGS.quota_fixed_ips,
'metadata_items': FLAGS.quota_metadata_items,
'injected_files': FLAGS.quota_max_injected_files,
'injected_file_content_bytes':
FLAGS.quota_max_injected_file_content_bytes,
'security_groups': FLAGS.quota_security_groups,
'security_group_rules': FLAGS.quota_security_group_rules,
}
# -1 in the quota flags means unlimited
for key in defaults.keys():
if defaults[key] == -1:
defaults[key] = None
return defaults
def get_project_quotas(context, project_id):
rval = _get_default_quotas()
quota = db.quota_get_all_by_project(context, project_id)
for key in rval.keys():
if key in quota:
rval[key] = quota[key]
return rval
def _get_request_allotment(requested, used, quota):
if quota is None:
return requested
return quota - used
def allowed_instances(context, requested_instances, instance_type):
"""Check quota and return min(requested_instances, allowed_instances)."""
project_id = context.project_id
context = context.elevated()
requested_cores = requested_instances * instance_type['vcpus']
requested_ram = requested_instances * instance_type['memory_mb']
usage = db.instance_data_get_for_project(context, project_id)
used_instances, used_cores, used_ram = usage
quota = get_project_quotas(context, project_id)
allowed_instances = _get_request_allotment(requested_instances,
used_instances,
quota['instances'])
allowed_cores = _get_request_allotment(requested_cores, used_cores,
quota['cores'])
allowed_ram = _get_request_allotment(requested_ram, used_ram, quota['ram'])
if instance_type['vcpus']:
allowed_instances = min(allowed_instances,
allowed_cores // instance_type['vcpus'])
if instance_type['memory_mb']:
allowed_instances = min(allowed_instances,
allowed_ram // instance_type['memory_mb'])
return min(requested_instances, allowed_instances)
def allowed_volumes(context, requested_volumes, size):
"""Check volume quotas and return breached if any."""
project_id = context.project_id
context = context.elevated()
size = int(size)
allowed = {}
overs = []
used_volumes, used_gigabytes = db.volume_data_get_for_project(context,
project_id)
usages = dict(volumes=used_volumes, gigabytes=used_gigabytes)
quotas = get_project_quotas(context, project_id)
def _check_allowed(resource, requested):
allow = _get_request_allotment(requested,
usages[resource],
quotas[resource])
if requested and allow < requested:
overs.append(resource)
allowed[resource] = allow
_check_allowed('volumes', requested_volumes)
_check_allowed('gigabytes', requested_volumes * size)
if size != 0:
allowed['volumes'] = min(allowed['volumes'],
int(allowed['gigabytes'] // size))
return dict(overs=overs, usages=usages, quotas=quotas, allowed=allowed)
def allowed_floating_ips(context, requested_floating_ips):
"""Check quota and return min(requested, allowed) floating ips."""
project_id = context.project_id
context = context.elevated()
used_floating_ips = db.floating_ip_count_by_project(context, project_id)
quota = get_project_quotas(context, project_id)
allowed_floating_ips = _get_request_allotment(requested_floating_ips,
used_floating_ips,
quota['floating_ips'])
return min(requested_floating_ips, allowed_floating_ips)
def allowed_fixed_ips(context, requested_fixed_ips):
"""Check quota and return min(requested, allowed) fixed ips."""
project_id = context.project_id
context = context.elevated()
used_fixed_ips = db.fixed_ip_count_by_project(context, project_id)
quota = get_project_quotas(context, project_id)
allowed_fixed_ips = _get_request_allotment(requested_fixed_ips,
used_fixed_ips,
quota['fixed_ips'])
return min(requested_fixed_ips, allowed_fixed_ips)
def allowed_security_groups(context, requested_security_groups):
"""Check quota and return min(requested, allowed) security groups."""
project_id = context.project_id
context = context.elevated()
used_sec_groups = db.security_group_count_by_project(context, project_id)
quota = get_project_quotas(context, project_id)
allowed_sec_groups = _get_request_allotment(requested_security_groups,
used_sec_groups,
quota['security_groups'])
return min(requested_security_groups, allowed_sec_groups)
def allowed_security_group_rules(context, security_group_id,
requested_rules):
"""Check quota and return min(requested, allowed) sec group rules."""
project_id = context.project_id
context = context.elevated()
used_rules = db.security_group_rule_count_by_group(context,
security_group_id)
quota = get_project_quotas(context, project_id)
allowed_rules = _get_request_allotment(requested_rules,
used_rules,
quota['security_group_rules'])
return min(requested_rules, allowed_rules)
def _calculate_simple_quota(context, resource, requested):
"""Check quota for resource; return min(requested, allowed)."""
quota = get_project_quotas(context, context.project_id)
allowed = _get_request_allotment(requested, 0, quota[resource])
return min(requested, allowed)
def allowed_metadata_items(context, requested_metadata_items):
"""Return the number of metadata items allowed."""
return _calculate_simple_quota(context, 'metadata_items',
requested_metadata_items)
def allowed_injected_files(context, requested_injected_files):
"""Return the number of injected files allowed."""
return _calculate_simple_quota(context, 'injected_files',
requested_injected_files)
def allowed_injected_file_content_bytes(context, requested_bytes):
"""Return the number of bytes allowed per injected file content."""
resource = 'injected_file_content_bytes'
return _calculate_simple_quota(context, resource, requested_bytes)
def allowed_injected_file_path_bytes(context):
"""Return the number of bytes allowed in an injected file path."""
return FLAGS.quota_max_injected_file_path_bytes
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