OpenStack Study: migrate_server.py

OpenStack Index

**** CubicPower OpenStack Study ****

# 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 webob

from webob import exc

from nova.api.openstack import common

from nova.api.openstack import extensions

from nova.api.openstack import wsgi

from nova import compute

from nova import exception

from nova.openstack.common.gettextutils import _

from nova.openstack.common import log as logging

from nova.openstack.common import strutils

LOG = logging.getLogger(__name__)

ALIAS = "os-migrate-server"

**** CubicPower OpenStack Study ****

def authorize(context, action_name):

action = 'v3:%s:%s' % (ALIAS, action_name)

extensions.extension_authorizer('compute', action)(context)

**** CubicPower OpenStack Study ****

class MigrateServerController(wsgi.Controller):

**** CubicPower OpenStack Study ****

def __init__(self, *args, **kwargs):

super(MigrateServerController, self).__init__(*args, **kwargs)

self.compute_api = compute.API()

@extensions.expected_errors((400, 404, 409, 413))

@wsgi.action('migrate')

**** CubicPower OpenStack Study ****

def _migrate(self, req, id, body):

"""Permit admins to migrate a server to a new host."""

context = req.environ['nova.context']

authorize(context, 'migrate')

instance = common.get_instance(self.compute_api, context, id,

want_objects=True)

try:

self.compute_api.resize(req.environ['nova.context'], instance)

except exception.TooManyInstances as e:

raise exc.HTTPRequestEntityTooLarge(explanation=e.format_message())

except exception.QuotaError as error:

raise exc.HTTPRequestEntityTooLarge(

explanation=error.format_message(),

headers={'Retry-After': 0})

except exception.InstanceIsLocked as e:

raise exc.HTTPConflict(explanation=e.format_message())

except exception.InstanceInvalidState as state_error:

common.raise_http_conflict_for_instance_invalid_state(state_error,

'migrate')

except exception.InstanceNotFound as e:

raise exc.HTTPNotFound(explanation=e.format_message())

return webob.Response(status_int=202)

@extensions.expected_errors((400, 404, 409))

@wsgi.action('migrate_live')

**** CubicPower OpenStack Study ****

def _migrate_live(self, req, id, body):

"""Permit admins to (live) migrate a server to a new host."""

context = req.environ["nova.context"]

authorize(context, 'migrate_live')

try:

block_migration = body["migrate_live"]["block_migration"]

disk_over_commit = body["migrate_live"]["disk_over_commit"]

host = body["migrate_live"]["host"]

except (TypeError, KeyError):

msg = _("host, block_migration and disk_over_commit must "

"be specified for live migration.")

raise exc.HTTPBadRequest(explanation=msg)

try:

block_migration = strutils.bool_from_string(block_migration,

strict=True)

disk_over_commit = strutils.bool_from_string(disk_over_commit,

strict=True)

except ValueError as err:

raise exc.HTTPBadRequest(explanation=str(err))

try:

instance = common.get_instance(self.compute_api, context, id,

want_objects=True)

self.compute_api.live_migrate(context, instance, block_migration,

disk_over_commit, host)

except (exception.ComputeServiceUnavailable,

exception.InvalidHypervisorType,

exception.UnableToMigrateToSelf,

exception.DestinationHypervisorTooOld,

exception.NoValidHost,

exception.InvalidLocalStorage,

exception.InvalidSharedStorage,

exception.MigrationPreCheckError) as ex:

raise exc.HTTPBadRequest(explanation=ex.format_message())

except exception.InstanceInvalidState as state_error:

common.raise_http_conflict_for_instance_invalid_state(state_error,

'migrate_live')

return webob.Response(status_int=202)

**** CubicPower OpenStack Study ****

class MigrateServer(extensions.V3APIExtensionBase):

"""Enable migrate and live-migrate server actions."""

name = "MigrateServer"

alias = ALIAS

namespace = "http://docs.openstack.org/compute/ext/%s/api/v3" % ALIAS

version = 1

**** CubicPower OpenStack Study ****

def get_controller_extensions(self):

controller = MigrateServerController()

extension = extensions.ControllerExtension(self, 'servers', controller)

return [extension]

**** CubicPower OpenStack Study ****

def get_resources(self):

return []