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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
# 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 import exception
from nova import flags
flags.DEFINE_integer('quota_instances', 10,
'number of instances allowed per project')
flags.DEFINE_integer('quota_cores', 20,
'number of instance cores allowed per project')
flags.DEFINE_integer('quota_ram', 50 * 1024,
'megabytes of instance ram allowed per project')
flags.DEFINE_integer('quota_volumes', 10,
'number of volumes allowed per project')
flags.DEFINE_integer('quota_gigabytes', 1000,
'number of volume gigabytes allowed per project')
flags.DEFINE_integer('quota_floating_ips', 10,
'number of floating ips allowed per project')
flags.DEFINE_integer('quota_metadata_items', 128,
'number of metadata items allowed per instance')
flags.DEFINE_integer('quota_max_injected_files', 5,
'number of injected files allowed')
flags.DEFINE_integer('quota_max_injected_file_content_bytes', 10 * 1024,
'number of bytes allowed per injected file')
flags.DEFINE_integer('quota_max_injected_file_path_bytes', 255,
'number of bytes allowed per injected file path')
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,
'metadata_items': FLAGS.quota_metadata_items,
'injected_files': FLAGS.quota_max_injected_files,
# -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,
allowed_cores = _get_request_allotment(requested_cores, used_cores,
allowed_ram = _get_request_allotment(requested_ram, used_ram, quota['ram'])
allowed_instances = min(allowed_instances,
allowed_cores // instance_type['vcpus'],
allowed_ram // instance_type['memory_mb'])
return min(requested_instances, allowed_instances)
def allowed_volumes(context, requested_volumes, size):
"""Check quota and return min(requested_volumes, allowed_volumes)."""
project_id = context.project_id
context = context.elevated()
size = int(size)
requested_gigabytes = requested_volumes * size
used_volumes, used_gigabytes = db.volume_data_get_for_project(context,
quota = get_project_quotas(context, project_id)
allowed_volumes = _get_request_allotment(requested_volumes, used_volumes,
allowed_gigabytes = _get_request_allotment(requested_gigabytes,
if size != 0:
allowed_volumes = min(allowed_volumes,
int(allowed_gigabytes // size))
return min(requested_volumes, allowed_volumes)
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,
return min(requested_floating_ips, allowed_floating_ips)
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',
def allowed_injected_files(context, requested_injected_files):
"""Return the number of injected files allowed."""
return _calculate_simple_quota(context, '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
class QuotaError(exception.ApiError):
"""Quota Exceeded."""
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