79 lines
2.8 KiB
Python
79 lines
2.8 KiB
Python
# Copyright (c) 2012 OpenStack Foundation
|
|
# Copyright (c) 2015 Rushil Chugh
|
|
# 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.
|
|
|
|
"""Share-related Utilities and helpers."""
|
|
|
|
DEFAULT_POOL_NAME = '_pool0'
|
|
|
|
|
|
def extract_host(host, level='backend', use_default_pool_name=False):
|
|
"""Extract Host, Backend or Pool information from host string.
|
|
|
|
:param host: String for host, which could include host@backend#pool info
|
|
:param level: Indicate which level of information should be extracted
|
|
from host string. Level can be 'host', 'backend', 'pool',
|
|
or 'backend_name', default value is 'backend'
|
|
:param use_default_pool_name: This flag specifies what to do
|
|
if level == 'pool' and there is no 'pool' info
|
|
encoded in host string. default_pool_name=True
|
|
will return DEFAULT_POOL_NAME, otherwise it will
|
|
return None. Default value of this parameter
|
|
is False.
|
|
:return: expected level of information
|
|
|
|
For example:
|
|
host = 'HostA@BackendB#PoolC'
|
|
ret = extract_host(host, 'host')
|
|
# ret is 'HostA'
|
|
ret = extract_host(host, 'backend')
|
|
# ret is 'HostA@BackendB'
|
|
ret = extract_host(host, 'pool')
|
|
# ret is 'PoolC'
|
|
ret = extract_host(host, 'backend_name')
|
|
# ret is 'BackendB'
|
|
host = 'HostX@BackendY'
|
|
ret = extract_host(host, 'pool')
|
|
# ret is None
|
|
ret = extract_host(host, 'pool', True)
|
|
# ret is '_pool0'
|
|
"""
|
|
if level == 'host':
|
|
# Make sure pool is not included
|
|
hst = host.split('#')[0]
|
|
return hst.split('@')[0]
|
|
if level == 'backend_name':
|
|
hst = host.split('#')[0]
|
|
return hst.split('@')[1]
|
|
elif level == 'backend':
|
|
return host.split('#')[0]
|
|
elif level == 'pool':
|
|
lst = host.split('#')
|
|
if len(lst) == 2:
|
|
return lst[1]
|
|
elif use_default_pool_name is True:
|
|
return DEFAULT_POOL_NAME
|
|
else:
|
|
return None
|
|
|
|
|
|
def append_host(host, pool):
|
|
"""Encode pool into host info."""
|
|
if not host or not pool:
|
|
return host
|
|
|
|
new_host = "#".join([host, pool])
|
|
return new_host
|