OpenStack Study: utils.py

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# vim: tabstop=4 shiftwidth=4 softtabstop=4

# Copyright 2013 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.

import hashlib

from neutron.api.v2.attributes import is_attr_set

from neutron.openstack.common import log

from neutron.version import version_info

LOG = log.getLogger(__name__)

MAX_DISPLAY_NAME_LEN = 40

NEUTRON_VERSION = version_info.release_string()

# Allowed network types for the NSX Plugin

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class NetworkTypes:

"""Allowed provider network types for the NSX Plugin."""

L3_EXT = 'l3_ext'

STT = 'stt'

GRE = 'gre'

FLAT = 'flat'

VLAN = 'vlan'

BRIDGE = 'bridge'

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def get_tags(**kwargs):

    tags = ([dict(tag=value, scope=key)

            for key, value in kwargs.iteritems()])

    tags.append({"tag": NEUTRON_VERSION, "scope": "quantum"})

    return tags

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def device_id_to_vm_id(device_id, obfuscate=False):

    # device_id can be longer than 40 characters, for example

    # a device_id for a dhcp port is like the following:

    #

    # dhcp83b5fdeb-e3b4-5e18-ac5f-55161...80747326-47d7-46c2-a87a-cf6d5194877c

    #

    # To fit it into an NSX tag we need to hash it, however device_id

    # used for ports associated to VM's are small enough so let's skip the

    # hashing

    if len(device_id) > MAX_DISPLAY_NAME_LEN or obfuscate:

        return hashlib.sha1(device_id).hexdigest()

    else:

        return device_id

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def check_and_truncate(display_name):

    if is_attr_set(display_name) and len(display_name) > MAX_DISPLAY_NAME_LEN:

        LOG.debug(_("Specified name:'%s' exceeds maximum length. "

                    "It will be truncated on NSX"), display_name)

        return display_name[:MAX_DISPLAY_NAME_LEN]

    return display_name or ''