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services.py
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services.py
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# Copyright 2012 IBM Corp.
#
# 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 oslo_utils import strutils
from oslo_utils import uuidutils
import webob.exc
from nova.api.openstack import api_version_request
from nova.api.openstack.compute.schemas import services
from nova.api.openstack import wsgi
from nova.api import validation
from nova import availability_zones
from nova import compute
from nova import exception
from nova.i18n import _
from nova import objects
from nova.policies import services as services_policies
from nova.scheduler.client import report
from nova import servicegroup
from nova import utils
UUID_FOR_ID_MIN_VERSION = '2.53'
PARTIAL_CONSTRUCT_FOR_CELL_DOWN_MIN_VERSION = '2.69'
class ServiceController(wsgi.Controller):
def __init__(self):
self.host_api = compute.HostAPI()
self.aggregate_api = compute.api.AggregateAPI()
self.servicegroup_api = servicegroup.API()
self.actions = {"enable": self._enable,
"disable": self._disable,
"disable-log-reason": self._disable_log_reason}
self._placementclient = None # Lazy-load on first access.
@property
def placementclient(self):
if self._placementclient is None:
self._placementclient = report.SchedulerReportClient()
return self._placementclient
def _get_services(self, req):
# The API services are filtered out since they are not RPC services
# and therefore their state is not reported through the service group
# API, so they would always be reported as 'down' (see bug 1543625).
api_services = ('nova-osapi_compute', 'nova-metadata')
context = req.environ['nova.context']
context.can(services_policies.BASE_POLICY_NAME)
cell_down_support = api_version_request.is_supported(
req, min_version=PARTIAL_CONSTRUCT_FOR_CELL_DOWN_MIN_VERSION)
_services = [
s
for s in self.host_api.service_get_all(context, set_zones=True,
all_cells=True, cell_down_support=cell_down_support)
if s['binary'] not in api_services
]
host = ''
if 'host' in req.GET:
host = req.GET['host']
binary = ''
if 'binary' in req.GET:
binary = req.GET['binary']
if host:
_services = [s for s in _services if s['host'] == host]
if binary:
_services = [s for s in _services if s['binary'] == binary]
return _services
def _get_service_detail(self, svc, additional_fields, req,
cell_down_support=False):
# NOTE(tssurya): The below logic returns a minimal service construct
# consisting of only the host, binary and status fields for the compute
# services in the down cell.
if (cell_down_support and 'uuid' not in svc):
return {'binary': svc.binary,
'host': svc.host,
'status': "UNKNOWN"}
alive = self.servicegroup_api.service_is_up(svc)
state = (alive and "up") or "down"
active = 'enabled'
if svc['disabled']:
active = 'disabled'
updated_time = self.servicegroup_api.get_updated_time(svc)
uuid_for_id = api_version_request.is_supported(
req, min_version=UUID_FOR_ID_MIN_VERSION)
if 'availability_zone' not in svc:
# The service wasn't loaded with the AZ so we need to do it here.
# Yes this looks weird, but set_availability_zones makes a copy of
# the list passed in and mutates the objects within it, so we have
# to pull it back out from the resulting copied list.
svc.availability_zone = (
availability_zones.set_availability_zones(
req.environ['nova.context'],
[svc])[0]['availability_zone'])
service_detail = {'binary': svc['binary'],
'host': svc['host'],
'id': svc['uuid' if uuid_for_id else 'id'],
'zone': svc['availability_zone'],
'status': active,
'state': state,
'updated_at': updated_time,
'disabled_reason': svc['disabled_reason']}
for field in additional_fields:
service_detail[field] = svc[field]
return service_detail
def _get_services_list(self, req, additional_fields=()):
_services = self._get_services(req)
cell_down_support = api_version_request.is_supported(req,
min_version=PARTIAL_CONSTRUCT_FOR_CELL_DOWN_MIN_VERSION)
return [self._get_service_detail(svc, additional_fields, req,
cell_down_support=cell_down_support) for svc in _services]
def _enable(self, body, context):
"""Enable scheduling for a service."""
return self._enable_disable(body, context, "enabled",
{'disabled': False,
'disabled_reason': None})
def _disable(self, body, context, reason=None):
"""Disable scheduling for a service with optional log."""
return self._enable_disable(body, context, "disabled",
{'disabled': True,
'disabled_reason': reason})
def _disable_log_reason(self, body, context):
"""Disable scheduling for a service with a log."""
try:
reason = body['disabled_reason']
except KeyError:
msg = _('Missing disabled reason field')
raise webob.exc.HTTPBadRequest(explanation=msg)
return self._disable(body, context, reason)
def _enable_disable(self, body, context, status, params_to_update):
"""Enable/Disable scheduling for a service."""
reason = params_to_update.get('disabled_reason')
ret_value = {
'service': {
'host': body['host'],
'binary': body['binary'],
'status': status
},
}
if reason:
ret_value['service']['disabled_reason'] = reason
self._update(context, body['host'], body['binary'], params_to_update)
return ret_value
def _forced_down(self, body, context):
"""Set or unset forced_down flag for the service"""
try:
forced_down = strutils.bool_from_string(body["forced_down"])
except KeyError:
msg = _('Missing forced_down field')
raise webob.exc.HTTPBadRequest(explanation=msg)
host = body['host']
binary = body['binary']
ret_value = {'service': {'host': host,
'binary': binary,
'forced_down': forced_down}}
self._update(context, host, binary, {"forced_down": forced_down})
return ret_value
def _update(self, context, host, binary, payload):
"""Do the actual PUT/update"""
# If the user tried to perform an action
# (disable/enable/force down) on a non-nova-compute
# service, provide a more useful error message.
if binary != 'nova-compute':
msg = (_(
'Updating a %(binary)s service is not supported. Only '
'nova-compute services can be updated.') % {'binary': binary})
raise webob.exc.HTTPBadRequest(explanation=msg)
try:
self.host_api.service_update(context, host, binary, payload)
except (exception.HostBinaryNotFound,
exception.HostMappingNotFound) as exc:
raise webob.exc.HTTPNotFound(explanation=exc.format_message())
def _perform_action(self, req, id, body, actions):
"""Calculate action dictionary dependent on provided fields"""
context = req.environ['nova.context']
context.can(services_policies.BASE_POLICY_NAME)
try:
action = actions[id]
except KeyError:
msg = _("Unknown action")
raise webob.exc.HTTPNotFound(explanation=msg)
return action(body, context)
@wsgi.response(204)
@wsgi.expected_errors((400, 404, 409))
def delete(self, req, id):
"""Deletes the specified service."""
context = req.environ['nova.context']
context.can(services_policies.BASE_POLICY_NAME)
if api_version_request.is_supported(
req, min_version=UUID_FOR_ID_MIN_VERSION):
if not uuidutils.is_uuid_like(id):
msg = _('Invalid uuid %s') % id
raise webob.exc.HTTPBadRequest(explanation=msg)
else:
try:
utils.validate_integer(id, 'id')
except exception.InvalidInput as exc:
raise webob.exc.HTTPBadRequest(
explanation=exc.format_message())
try:
service = self.host_api.service_get_by_id(context, id)
# remove the service from all the aggregates in which it's included
if service.binary == 'nova-compute':
# Check to see if there are any instances on this compute host
# because if there are, we need to block the service (and
# related compute_nodes record) delete since it will impact
# resource accounting in Placement and orphan the compute node
# resource provider.
# TODO(mriedem): Use a COUNT SQL query-based function instead
# of InstanceList.get_uuids_by_host for performance.
instance_uuids = objects.InstanceList.get_uuids_by_host(
context, service['host'])
if instance_uuids:
raise webob.exc.HTTPConflict(
explanation=_('Unable to delete compute service that '
'is hosting instances. Migrate or '
'delete the instances first.'))
aggrs = self.aggregate_api.get_aggregates_by_host(context,
service.host)
for ag in aggrs:
self.aggregate_api.remove_host_from_aggregate(context,
ag.id,
service.host)
# remove the corresponding resource provider record from
# placement for this compute node
self.placementclient.delete_resource_provider(
context, service.compute_node, cascade=True)
# remove the host_mapping of this host.
try:
hm = objects.HostMapping.get_by_host(context, service.host)
hm.destroy()
except exception.HostMappingNotFound:
# It's possible to startup a nova-compute service and then
# delete it (maybe it was accidental?) before mapping it to
# a cell using discover_hosts, so we just ignore this.
pass
service.destroy()
except exception.ServiceNotFound:
explanation = _("Service %s not found.") % id
raise webob.exc.HTTPNotFound(explanation=explanation)
except exception.ServiceNotUnique:
explanation = _("Service id %s refers to multiple services.") % id
raise webob.exc.HTTPBadRequest(explanation=explanation)
@validation.query_schema(services.index_query_schema)
@wsgi.expected_errors(())
def index(self, req):
"""Return a list of all running services. Filter by host & service
name
"""
if api_version_request.is_supported(req, min_version='2.11'):
_services = self._get_services_list(req, ['forced_down'])
else:
_services = self._get_services_list(req)
return {'services': _services}
@wsgi.Controller.api_version('2.1', '2.52')
@wsgi.expected_errors((400, 404))
@validation.schema(services.service_update, '2.0', '2.10')
@validation.schema(services.service_update_v211, '2.11', '2.52')
def update(self, req, id, body):
"""Perform service update
Before microversion 2.53, the body contains a host and binary value
to identify the service on which to perform the action. There is no
service ID passed on the path, just the action, for example
PUT /os-services/disable.
"""
if api_version_request.is_supported(req, min_version='2.11'):
actions = self.actions.copy()
actions["force-down"] = self._forced_down
else:
actions = self.actions
return self._perform_action(req, id, body, actions)
@wsgi.Controller.api_version(UUID_FOR_ID_MIN_VERSION) # noqa F811
@wsgi.expected_errors((400, 404))
@validation.schema(services.service_update_v2_53, UUID_FOR_ID_MIN_VERSION)
def update(self, req, id, body):
"""Perform service update
Starting with microversion 2.53, the service uuid is passed in on the
path of the request to uniquely identify the service record on which to
perform a given update, which is defined in the body of the request.
"""
service_id = id
# Validate that the service ID is a UUID.
if not uuidutils.is_uuid_like(service_id):
msg = _('Invalid uuid %s') % service_id
raise webob.exc.HTTPBadRequest(explanation=msg)
# Validate the request context against the policy.
context = req.environ['nova.context']
context.can(services_policies.BASE_POLICY_NAME)
# Get the service by uuid.
try:
service = self.host_api.service_get_by_id(context, service_id)
# At this point the context is targeted to the cell that the
# service was found in so we don't need to do any explicit cell
# targeting below.
except exception.ServiceNotFound as e:
raise webob.exc.HTTPNotFound(explanation=e.format_message())
# Return 400 if service.binary is not nova-compute.
# Before the earlier PUT handlers were made cells-aware, you could
# technically disable a nova-scheduler service, although that doesn't
# really do anything within Nova and is just confusing. Now trying to
# do that will fail as a nova-scheduler service won't have a host
# mapping so you'll get a 400. In this new microversion, we close that
# old gap and make sure you can only enable/disable and set forced_down
# on nova-compute services since those are the only ones that make
# sense to update for those operations.
if service.binary != 'nova-compute':
msg = (_('Updating a %(binary)s service is not supported. Only '
'nova-compute services can be updated.') %
{'binary': service.binary})
raise webob.exc.HTTPBadRequest(explanation=msg)
# Now determine the update to perform based on the body. We are
# intentionally not using _perform_action or the other old-style
# action functions.
if 'status' in body:
# This is a status update for either enabled or disabled.
if body['status'] == 'enabled':
# Fail if 'disabled_reason' was requested when enabling the
# service since those two combined don't make sense.
if body.get('disabled_reason'):
msg = _("Specifying 'disabled_reason' with status "
"'enabled' is invalid.")
raise webob.exc.HTTPBadRequest(explanation=msg)
service.disabled = False
service.disabled_reason = None
elif body['status'] == 'disabled':
service.disabled = True
# The disabled reason is optional.
service.disabled_reason = body.get('disabled_reason')
# This is intentionally not an elif, i.e. it's in addition to the
# status update.
if 'forced_down' in body:
service.forced_down = strutils.bool_from_string(
body['forced_down'], strict=True)
# Check to see if anything was actually updated since the schema does
# not define any required fields.
if not service.obj_what_changed():
msg = _("No updates were requested. Fields 'status' or "
"'forced_down' should be specified.")
raise webob.exc.HTTPBadRequest(explanation=msg)
# Now save our updates to the service record in the database.
service.save()
# Return the full service record details.
additional_fields = ['forced_down']
return {'service': self._get_service_detail(
service, additional_fields, req)}