Ansible playbooks for deploying OpenStack.
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openstack-ansible/playbooks/plugins/filters/osa-filters.py

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1.7 KiB

# Copyright 2015, Rackspace US, Inc.
#
# 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.
#
# (c) 2015, Kevin Carter <kevin.carter@rackspace.com>
import hashlib
"""Filter usage:
Simple filters that may be useful from within the stack
"""
def bit_length_power_of_2(value):
"""Return the smallest power of 2 greater than a numeric value.
:param value: Number to find the smallest power of 2
:type value: ``int``
:returns: ``int``
"""
return 2 ** (int(value) - 1).bit_length()
def string_2_int(string):
"""Return the an integer from a string.
The string is hashed, converted to a base36 int, and the modulo of 10240
is returned.
:param string: string to retrieve an int from
:type string: ``str``
:returns: ``int``
"""
# Try to encode utf-8 else pass
try:
string = string.encode('utf-8')
except AttributeError:
pass
hashed_name = hashlib.sha256(string).hexdigest()
return int(hashed_name, 36) % 10240
class FilterModule(object):
"""Ansible jinja2 filters."""
@staticmethod
def filters():
return {
'bit_length_power_of_2': bit_length_power_of_2,
'string_2_int': string_2_int
}