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# -*- coding: utf-8 -*-
# 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 random
from ovsdbapp import constants
# NOTE(twilson) This code was copied from the neutron/neutron-lib trees
def get_random_string(length):
"""Get a random hex string of the specified length.
:param length: The length for the hex string.
:returns: A random hex string of the said length.
"""
return "{0:0{1}x}".format(random.getrandbits(length * 4), length)
def get_rand_name(max_length=None, prefix='test'):
"""Return a random string.
The string will start with 'prefix' and will be exactly 'max_length'.
If 'max_length' is None, then exactly 8 random characters, each
hexadecimal, will be added. In case len(prefix) <= len(max_length),
ValueError will be raised to indicate the problem.
"""
return get_related_rand_names([prefix], max_length)[0]
def get_rand_device_name(prefix='test'):
return get_rand_name(
max_length=constants.DEVICE_NAME_MAX_LEN, prefix=prefix)
def get_related_rand_names(prefixes, max_length=None):
"""Returns a list of the prefixes with the same random characters appended
:param prefixes: A list of prefix strings
:param max_length: The maximum length of each returned string
:returns: A list with each prefix appended with the same random characters
"""
if max_length:
length = max_length - max(len(p) for p in prefixes)
if length <= 0:
raise ValueError("'max_length' must be longer than all prefixes")
else:
length = 8
rndchrs = get_random_string(length)
return [p + rndchrs for p in prefixes]
def get_related_rand_device_names(prefixes):
return get_related_rand_names(prefixes,
max_length=constants.DEVICE_NAME_MAX_LEN)
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