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# Licensed to the Apache Software Foundation (ASF) under one or more
# contributor license agreements. See the NOTICE file distributed with
# this work for additional information regarding copyright ownership.
# The ASF licenses this file to You 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.
"""
ARIA core module.
"""
from . import exceptions
from .parser import consumption
from .parser.loading.location import UriLocation
from .orchestrator import topology
class Core(object):
def __init__(self,
model_storage,
resource_storage,
plugin_manager):
self._model_storage = model_storage
self._resource_storage = resource_storage
self._plugin_manager = plugin_manager
@property
def model_storage(self):
return self._model_storage
@property
def resource_storage(self):
return self._resource_storage
@property
def plugin_manager(self):
return self._plugin_manager
def validate_service_template(self, service_template_path):
self._parse_service_template(service_template_path)
def create_service_template(self, service_template_path, service_template_dir,
service_template_name):
context = self._parse_service_template(service_template_path)
service_template = context.modeling.template
service_template.name = service_template_name
self.model_storage.service_template.put(service_template)
self.resource_storage.service_template.upload(
entry_id=str(service_template.id), source=service_template_dir)
return service_template.id
def delete_service_template(self, service_template_id):
service_template = self.model_storage.service_template.get(service_template_id)
if service_template.services:
raise exceptions.DependentServicesError(
'Can\'t delete service template `{0}` - service template has existing services'
.format(service_template.name))
self.model_storage.service_template.delete(service_template)
self.resource_storage.service_template.delete(entry_id=str(service_template.id))
def create_service(self, service_template_id, inputs, service_name=None):
service_template = self.model_storage.service_template.get(service_template_id)
storage_session = self.model_storage._all_api_kwargs['session']
# setting no autoflush for the duration of instantiation - this helps avoid dependency
# constraints as they're being set up
with storage_session.no_autoflush:
topology_ = topology.Topology()
service = topology_.instantiate(
service_template, inputs=inputs, plugins=self.model_storage.plugin.list())
topology_.coerce(service, report_issues=True)
topology_.validate(service)
topology_.satisfy_requirements(service)
topology_.coerce(service, report_issues=True)
topology_.validate_capabilities(service)
topology_.assign_hosts(service)
topology_.configure_operations(service)
topology_.coerce(service, report_issues=True)
if topology_.dump_issues():
raise exceptions.InstantiationError('Failed to instantiate service template `{0}`'
.format(service_template.name))
storage_session.flush() # flushing so service.id would auto-populate
service.name = service_name or '{0}_{1}'.format(service_template.name, service.id)
self.model_storage.service.put(service)
return service
def delete_service(self, service_id, force=False):
service = self.model_storage.service.get(service_id)
active_executions = [e for e in service.executions if e.is_active()]
if active_executions:
raise exceptions.DependentActiveExecutionsError(
'Can\'t delete service `{0}` - there is an active execution for this service. '
'Active execution ID: {1}'.format(service.name, active_executions[0].id))
if not force:
available_nodes = [str(n.id) for n in service.nodes.itervalues() if n.is_available()]
if available_nodes:
raise exceptions.DependentAvailableNodesError(
'Can\'t delete service `{0}` - there are available nodes for this service. '
'Available node IDs: {1}'.format(service.name, ', '.join(available_nodes)))
self.model_storage.service.delete(service)
@staticmethod
def _parse_service_template(service_template_path):
context = consumption.ConsumptionContext()
context.presentation.location = UriLocation(service_template_path)
# Most of the parser uses the topology package in order to manipulate the models.
# However, here we use the Consumer mechanism, but this should change in the future.
consumption.ConsumerChain(
context,
(
consumption.Read,
consumption.Validate,
consumption.ServiceTemplate
)).consume()
if context.validation.dump_issues():
raise exceptions.ParsingError('Failed to parse service template')
return context
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