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# 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.
import netaddr
from rally.common import logging
from rally.common import utils
LOG = logging.getLogger(__name__)
_IPv4_START_CIDR = "10.2.0.0/24"
_IPv6_START_CIDR = "dead:beaf::/64"
_IPv4_CIDR_INCR = utils.RAMInt()
_IPv6_CIDR_INCR = utils.RAMInt()
def get_ip_version(ip):
return netaddr.IPNetwork(ip).version
def generate_cidr(ip_version=None, start_cidr=None):
"""Generate next CIDR for network or subnet, without IP overlapping.
This is process and thread safe, because `cidr_incr' points to
value stored directly in RAM. This guarantees that CIDRs will be
serial and unique even under hard multiprocessing/threading load.
:param ip_version: version of IP to take default value for start_cidr
:param start_cidr: start CIDR str
"""
if start_cidr is None:
if ip_version == 6:
start_cidr = _IPv6_START_CIDR
else:
start_cidr = _IPv4_START_CIDR
ip_version = get_ip_version(start_cidr)
if ip_version == 4:
cidr = str(netaddr.IPNetwork(start_cidr).next(next(_IPv4_CIDR_INCR)))
else:
cidr = str(netaddr.IPNetwork(start_cidr).next(next(_IPv6_CIDR_INCR)))
LOG.debug("CIDR generated: %s" % cidr)
return ip_version, cidr
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