def create_servicechain_instance(self, context, servicechain_instance):
"""Instance created.
When a Servicechain Instance is created, all its nodes need to be
instantiated.
"""
instance = self._process_commit_phase(context)
if instance:
return instance
deployers = {}
# REVISIT: Consider adding ensure_tenant() call here
with db_api.CONTEXT_WRITER.using(context):
instance = super(NodeCompositionPlugin,
self).create_servicechain_instance(
context, servicechain_instance)
if len(instance['servicechain_specs']) > 1:
raise exc.OneSpecPerInstanceAllowed()
deployers = self._get_scheduled_drivers(context, instance,
'deploy')
if not gutils.is_precommit_policy_driver_configured():
# Actual node deploy
try:
self._deploy_servicechain_nodes(context, deployers)
except Exception:
# Some node could not be deployed
with excutils.save_and_reraise_exception():
LOG.error(
"Node deployment failed, "
"deleting servicechain_instance %s", instance['id'])
self.delete_servicechain_instance(context, instance['id'])
return instance
def create_servicechain_instance(self, context, servicechain_instance):
"""Instance created.
When a Servicechain Instance is created, all its nodes need to be
instantiated.
"""
session = context.session
deployers = {}
with session.begin(subtransactions=True):
instance = super(NodeCompositionPlugin,
self).create_servicechain_instance(
context, servicechain_instance)
if len(instance['servicechain_specs']) > 1:
raise exc.OneSpecPerInstanceAllowed()
deployers = self._get_scheduled_drivers(context, instance,
'deploy')
# Actual node deploy
try:
self._deploy_servicechain_nodes(context, deployers)
except Exception:
# Some node could not be deployed
with excutils.save_and_reraise_exception():
LOG.error(
_LE("Node deployment failed, "
"deleting servicechain_instance %s"), instance['id'])
self.delete_servicechain_instance(context, instance['id'])
return instance
def update_servicechain_instance(self, context, servicechain_instance_id,
servicechain_instance):
"""Instance updated.
When a Servicechain Instance is updated and the spec changed, all the
nodes of the previous spec should be destroyed and the newer ones
created.
"""
session = context.session
deployers = {}
destroyers = {}
with session.begin(subtransactions=True):
original_instance = self.get_servicechain_instance(
context, servicechain_instance_id)
updated_instance = super(NodeCompositionPlugin,
self).update_servicechain_instance(
context, servicechain_instance_id,
servicechain_instance)
if (original_instance['servicechain_specs'] !=
updated_instance['servicechain_specs']):
if len(updated_instance['servicechain_specs']) > 1:
raise exc.OneSpecPerInstanceAllowed()
destroyers = self._get_scheduled_drivers(
context, original_instance, 'destroy')
deployers = self._get_scheduled_drivers(
context, updated_instance, 'deploy')
self._destroy_servicechain_nodes(context, destroyers)
self._deploy_servicechain_nodes(context, deployers)
return updated_instance
def update_servicechain_instance(self, context, servicechain_instance_id,
servicechain_instance):
"""Instance updated.
When a Servicechain Instance is updated and the spec changed, all the
nodes of the previous spec should be destroyed and the newer ones
created.
"""
instance = self._process_commit_phase(context)
if instance:
return instance
session = context.session
deployers = {}
updaters = {}
destroyers = {}
with session.begin(subtransactions=True):
original_instance = self.get_servicechain_instance(
context, servicechain_instance_id)
updated_instance = super(NodeCompositionPlugin,
self).update_servicechain_instance(
context, servicechain_instance_id,
servicechain_instance)
if (original_instance['servicechain_specs'] !=
updated_instance['servicechain_specs']):
if len(updated_instance['servicechain_specs']) > 1:
raise exc.OneSpecPerInstanceAllowed()
destroyers = self._get_scheduled_drivers(
context, original_instance, 'destroy')
else: # Could be classifier update
updaters = self._get_scheduled_drivers(context,
original_instance,
'update')
if (original_instance['servicechain_specs'] !=
updated_instance['servicechain_specs']):
self._destroy_servicechain_nodes(context, destroyers)
deployers = self._get_scheduled_drivers(context, updated_instance,
'deploy')
context.deployers = deployers
context.servicechain_instance = updated_instance
if not gutils.is_precommit_policy_driver_configured():
self._deploy_servicechain_nodes(context, deployers)
else:
self._update_servicechain_nodes(context, updaters)
return updated_instance
def _get_resource(self, context, resource_name, resource_id, fields=None):
session = context.session
deployers = {}
with session.begin(subtransactions=True):
resource = getattr(super(NodeCompositionPlugin, self),
'get_' + resource_name)(context, resource_id)
if resource_name == 'servicechain_instance':
if len(resource['servicechain_specs']) > 1:
raise exc.OneSpecPerInstanceAllowed()
try:
deployers = self._get_scheduled_drivers(
context, resource, 'get')
except Exception:
LOG.warning(_LW("Failed to get node driver"))
# Invoke drivers only if status attributes are requested
if not fields or STATUS_SET.intersection(set(fields)):
_resource = self._get_resource_status(context, resource_name,
deployers)
if _resource:
updated_status = _resource['status']
updated_status_details = _resource['status_details']
if resource['status'] != updated_status or (
resource['status_details'] != updated_status_details):
new_status = {
resource_name: {
'status': updated_status,
'status_details': updated_status_details
}
}
session = context.session
with session.begin(subtransactions=True):
getattr(super(NodeCompositionPlugin, self),
'update_' + resource_name)(context,
resource['id'],
new_status)
resource['status'] = updated_status
resource['status_details'] = updated_status_details
return self._fields(resource, fields)
