110 lines
4.1 KiB
Python
110 lines
4.1 KiB
Python
# vim: tabstop=4 shiftwidth=4 softtabstop=4
|
|
|
|
# Copyright 2013 Netease, LLC.
|
|
# 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.
|
|
|
|
"""The Extended Availability Zone Status API extension."""
|
|
|
|
from nova.api.openstack import extensions
|
|
from nova.api.openstack import wsgi
|
|
from nova.api.openstack import xmlutil
|
|
from nova import availability_zones
|
|
from nova.openstack.common import memorycache
|
|
|
|
# NOTE(vish): azs don't change that often, so cache them for an hour to
|
|
# avoid hitting the db multiple times on every request.
|
|
AZ_CACHE_SECONDS = 60 * 60
|
|
authorize = extensions.soft_extension_authorizer('compute',
|
|
'extended_availability_zone')
|
|
|
|
|
|
class ExtendedAZController(wsgi.Controller):
|
|
def __init__(self):
|
|
self.mc = memorycache.get_client()
|
|
|
|
def _get_host_az(self, context, instance):
|
|
host = str(instance.get('host'))
|
|
if not host:
|
|
return None
|
|
cache_key = "azcache-%s" % host
|
|
az = self.mc.get(cache_key)
|
|
if not az:
|
|
elevated = context.elevated()
|
|
az = availability_zones.get_host_availability_zone(elevated, host)
|
|
self.mc.set(cache_key, az, AZ_CACHE_SECONDS)
|
|
return az
|
|
|
|
def _extend_server(self, context, server, instance):
|
|
key = "%s:availability_zone" % Extended_availability_zone.alias
|
|
server[key] = self._get_host_az(context, instance)
|
|
|
|
@wsgi.extends
|
|
def show(self, req, resp_obj, id):
|
|
context = req.environ['nova.context']
|
|
if authorize(context):
|
|
resp_obj.attach(xml=ExtendedAZTemplate())
|
|
server = resp_obj.obj['server']
|
|
db_instance = req.get_db_instance(server['id'])
|
|
self._extend_server(context, server, db_instance)
|
|
|
|
@wsgi.extends
|
|
def detail(self, req, resp_obj):
|
|
context = req.environ['nova.context']
|
|
if authorize(context):
|
|
resp_obj.attach(xml=ExtendedAZsTemplate())
|
|
servers = list(resp_obj.obj['servers'])
|
|
for server in servers:
|
|
db_instance = req.get_db_instance(server['id'])
|
|
self._extend_server(context, server, db_instance)
|
|
|
|
|
|
class Extended_availability_zone(extensions.ExtensionDescriptor):
|
|
"""Extended Server Attributes support."""
|
|
|
|
name = "ExtendedAvailabilityZone"
|
|
alias = "OS-EXT-AZ"
|
|
namespace = ("http://docs.openstack.org/compute/ext/"
|
|
"extended_availability_zone/api/v2")
|
|
updated = "2013-01-30T00:00:00+00:00"
|
|
|
|
def get_controller_extensions(self):
|
|
controller = ExtendedAZController()
|
|
extension = extensions.ControllerExtension(self, 'servers', controller)
|
|
return [extension]
|
|
|
|
|
|
def make_server(elem):
|
|
elem.set('{%s}availability_zone' % Extended_availability_zone.namespace,
|
|
'%s:availability_zone' % Extended_availability_zone.alias)
|
|
|
|
|
|
class ExtendedAZTemplate(xmlutil.TemplateBuilder):
|
|
def construct(self):
|
|
root = xmlutil.TemplateElement('server', selector='server')
|
|
make_server(root)
|
|
alias = Extended_availability_zone.alias
|
|
namespace = Extended_availability_zone.namespace
|
|
return xmlutil.SlaveTemplate(root, 1, nsmap={alias: namespace})
|
|
|
|
|
|
class ExtendedAZsTemplate(xmlutil.TemplateBuilder):
|
|
def construct(self):
|
|
root = xmlutil.TemplateElement('servers')
|
|
elem = xmlutil.SubTemplateElement(root, 'server', selector='servers')
|
|
make_server(elem)
|
|
alias = Extended_availability_zone.alias
|
|
namespace = Extended_availability_zone.namespace
|
|
return xmlutil.SlaveTemplate(root, 1, nsmap={alias: namespace})
|