OpenStack Study: version.py

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# Copyright 2012 VMware, Inc.

#

# 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.

#

from neutron.openstack.common import log as logging

LOG = logging.getLogger(__name__)

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def find_version(headers):

    """Retrieve NSX controller version from response headers."""

    for (header_name, header_value) in (headers or ()):

        try:

            if header_name == 'server':

                return Version(header_value.split('/')[1])

        except IndexError:

            LOG.warning(_("Unable to fetch NSX version from response "

                          "headers :%s"), headers)

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class Version(object):

"""Abstracts NSX version by exposing major and minor."""

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    def __init__(self, version):

        self.full_version = version.split('.')

        self.major = int(self.full_version[0])

        self.minor = int(self.full_version[1])

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    def __str__(self):

        return '.'.join(self.full_version)