92 lines
3.6 KiB
Python
92 lines
3.6 KiB
Python
# Copyright 2018 Canonical Ltd
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#
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# Licensed under the Apache License, Version 2.0 (the "License");
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# you may not use this file except in compliance with the License.
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# You may obtain a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.
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# NOTE(fnordahl) imported dependencies are included in the reactive charm
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# ``wheelhouse.txt`` and are isolated from any system installed payload managed
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# by the charm.
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#
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# An alternative could be to execute the openstack CLI to manage the resources,
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# but at the time of this writing we can not due to it producing invalid JSON
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# and YAML for the ``fixed_ips`` field when providing details for a Neutron
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# port.
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from keystoneauth1 import identity as keystone_identity
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from keystoneauth1 import session as keystone_session
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from keystoneauth1 import exceptions as keystone_exceptions
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from novaclient import client as nova_client
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class APIUnavailable(Exception):
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def __init__(self, service_type, resource_type, upstream_exception):
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self.service_type = service_type
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self.resource_type = resource_type
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self.upstream_exception = upstream_exception
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def session_from_identity_service(identity_service):
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"""Get Keystone Session from `identity-service` relation.
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:param identity_service: reactive Endpoint
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:type identity_service: RelationBase
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:returns: Keystone session
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:rtype: keystone_session.Session
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"""
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auth = keystone_identity.Password(
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auth_url='{}://{}:{}/'
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.format(identity_service.auth_protocol(),
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identity_service.auth_host(),
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identity_service.auth_port()),
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user_domain_name=identity_service.service_domain(),
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username=identity_service.service_username(),
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password=identity_service.service_password(),
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project_domain_name=identity_service.service_domain(),
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project_name=identity_service.service_tenant(),
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)
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return keystone_session.Session(auth=auth)
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def get_nova_flavor(identity_service):
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"""Get or create private Nova flavor for use with Octavia.
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A side effect of calling this function is that Nova flavors are
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created if they do not already exist.
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Handle exceptions ourself without Tenacity so we can detect Nova API
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readiness. At present we do not have a relation or interface to inform us
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about Nova API readiness. This function also executes just one or two API
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calls.
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:param identity_service: reactive Endpoint of type ``identity-service``
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:type identity_service: RelationBase class
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:returns: Nova Flavor Resource object
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:rtype: novaclient.v2.flavors.Flavor
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"""
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try:
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session = session_from_identity_service(identity_service)
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nova = nova_client.Client('2', session=session)
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flavors = nova.flavors.list(is_public=False)
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for flavor in flavors:
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if flavor.name == 'charm-octavia':
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return flavor
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# create flavor
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return nova.flavors.create('charm-octavia', 1024, 1, 8,
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is_public=False)
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except (keystone_exceptions.catalog.EndpointNotFound,
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keystone_exceptions.connection.ConnectFailure,
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nova_client.exceptions.ConnectionRefused,
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nova_client.exceptions.ClientException) as e:
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raise APIUnavailable('nova', 'flavors', e)
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