def _create_migration(self, ctxt, migration_ref):
"""
Migration setps:
Step - 1: Get resource object, R
Step - 2: Get the source cloud, S
Step - 3: Get the destination cloud, D
Step - 4: Check if D is destination
Step - 5: Check if S support R migration
Step - 6: Check if D support R migration
Step - 7: Load source driver, source_driver
Step - 8: Load destination driver, dest_driver
Step - 9: Call R's migration method
"""
utils.migration_status_update(migration_ref, 'INITIATING', 'validating')
try:
# NOTE(Step - 1): Get resource object, R
resource = objects.Resource.get_by_id(ctxt,
migration_ref.resource_id)
# NOTE(Step - 2): Get the source cloud, S
source = objects.Cloud.get_by_id(ctxt, resource.cloud_id)
# NOTE(Step - 3): Get the destination cloud, D
dest = objects.Cloud.get_by_id(ctxt,
migration_ref.destination_cloud_id)
except exception.GutsException as error:
LOG.exception(error.message)
utils.migration_status_update(migration_ref, 'FAILED', '-', error.message)
raise exception.MigrationFailed(messaage=error.message)
except Exception as error:
LOG.exception(error.message)
utils.migration_status_update(migration_ref, 'FAILED', '-', error.message)
raise exception.MigrationFailed(message=error.message)
LOG.info(_LI('Starting %(r_name)s migration from %(s_name)s cloud '
'to %(d_name)s cloud.') % {'r_name': resource.name,
's_name': source.name,
'd_name': dest.name})
# NOTE(Step - 4): Verify D supports R migration
if dest.type != "destination":
msg = (_('Cloud %(cloud_name)s is not a destination Cloud.'),
{'cloud_name': dest.name})
LOG.exception(msg)
utils.migration_status_update(migration_ref, 'FAILED', '-', msg)
raise exception.MigrationFailed(message=msg)
# NOTE(Step - 5): Check if S support R migration
if resource.type not in ast.literal_eval(source.capabilities):
msg = (_('%(resource_type)s resource migration not supported by '
'the source cloud %(cloud_name)s.'),
{'resource_type': resource.type,
'cloud_name': source.name})
LOG.exception(msg)
utils.migration_status_update(migration_ref, 'FAILED', '-', msg)
raise exception.MigrationFailed(message=msg)
# NOTE(Step - 6): Check if D support R migration
if resource.type not in ast.literal_eval(dest.capabilities):
msg = (_('%(resource_type)s resource migration not supported by '
'the destination cloud %(cloud_name)s.'),
{'resource_type': resource.type,
'cloud_name': dest.name})
LOG.exception(msg)
utils.migration_status_update(migration_ref, 'FAILED', '-', msg)
raise exception.MigrationFailed(message=msg)
# NOTE(Step - 7): Load source driver, source_driver
try:
source_driver = importutils.import_object(source.driver,
cloud=source)
except Exception:
msg = (_('Failed to load source driver: %s') % source.driver)
LOG.exception(msg)
utils.migration_status_update(migration_ref, 'FAILED', '-', msg)
raise exception.MigrationFailed(message=msg)
# NOTE(Step - 8): Load destination driver, dest_driver
try:
dest_driver = importutils.import_object(dest.driver, cloud=dest)
except Exception:
msg = (_('Failed to load destination driver: %s') % dest.driver)
LOG.exception(msg)
utils.migration_status_update(migration_ref, 'FAILED', '-', msg)
raise exception.MigrationFailed(message=msg)
# NOTE(Step - 9): Call migration method
try:
self._migrate_resource(migration_ref, resource, source_driver, dest_driver)
except AttributeError:
msg = (_('Method %(name)s not implemented in the manager:')
% {'name': method_name})
LOG.exception(msg)
utils.migration_status_update(migration_ref, 'FAILED', '-', msg)
raise exception.MigrationFailed(message=msg)
except exception.OpenStackException as error:
msg = (_('Failed fetch resource %(r_name)s properties from '
'%(s_name)s cloud: %(err)s') % {'r_name': resource.name,
's_name': source.name,
'err': error})
LOG.exception(msg)
utils.migration_status_update(migration_ref, 'FAILED', '-', msg)
raise exception.MigrationFailed(message=msg)
def _migrate_resource(self, migration_ref, resource_ref,
source_driver, dest_driver):
"""
Steps to migrate users
Step - 1: Check if user still exist on source cloud, get
properties, if exists
Step - 2: Get the required params list from destination cloud,
to create user
Step - 3: Asign source user properties to the destination params
Step - 4: Send assigned properties to destination to create user
"""
utils.migration_status_update(migration_ref, 'INPROGRESS', 'fetching from source')
# NOTE(Step - 1): Check if user still exist on source cloud, get
# properties, if exists
source_resource_id = resource_ref.id_at_source
try:
meth = getattr(source_driver, 'get_%s' % resource_ref.type)
if resource_ref.type in ['instance', 'image', 'volume']:
con_dir = create_con_dir(migration_ref.id)
source_resource_properties = meth(source_resource_id, con_dir)
else:
source_resource_properties = meth(source_resource_id)
except Exception as error:
msg = (_('Failed to fetch resource %(resource_id)s properties from source '
'cloud. Reason: %(reason)s') % {'resource_id': source_resource_id,
'reason': error.message})
LOG.exception(msg)
utils.migration_status_update(migration_ref, 'FAILED', '-', msg)
raise exception.MigrationFailed(message=msg)
# NOTE(Step - 2): Get the required params list from destination cloud,
# to create user
try:
meth = getattr(dest_driver, 'get_%s_params' % resource_ref.type)
required_params = meth()
except Exception as error:
msg = (_('Failed to fetch required resource properties from destination '
'cloud. Reason: %s') % error.message)
LOG.exception(msg)
utils.migration_status_update(migration_ref, 'FAILED', '-', msg)
raise exception.MigrationFailed(message=msg)
resource_params = {}
# NOTE(Step - 3): Asign source user properties to the destination params
utils.migration_status_update(migration_ref, event='creating at destination')
for param in required_params['from_source'].keys():
from_source = source_resource_properties.get(param)
from_user = migration_ref.properties.get(param)
val = from_user or from_source
if val:
required_params['from_source'][param] = val
for param in required_params['from_user'].keys():
val = migration_ref.properties.get(param)
if val:
required_params['from_user'][param] = val
# NOTE(Step - 4): Send assigned properties to destination to create resource
resource_params = required_params['from_source'].copy()
resource_params.update(required_params['from_user'])
try:
meth = getattr(dest_driver, 'create_%s' % resource_ref.type)
meth(resource_params)
except Exception as error:
msg = (_('Failed to create resource at the destination with '
'params: %(param)s. Reason: %(err)s') % {'param': resource_params,
'err': error})
LOG.exception(msg)
utils.migration_status_update(migration_ref, 'FAILED', '-', msg)
raise exception.MigrationFailed(message=msg)
utils.migration_status_update(migration_ref, 'SUCCESS', '-')
def create_migration(self, ctxt, migration_ref):
try:
self._create_migration(ctxt, migration_ref)
except Exception as error:
msg = (_('%s') % error)
utils.migration_status_update(migration_ref, 'FAILED', '-', msg)
