def scale_cluster(cluster, node_group_names_map, plugin):
# Now let's work with real node_groups, not names:
node_groups_map = {}
for ng in cluster.node_groups:
if ng.name in node_group_names_map:
node_groups_map.update({ng: node_group_names_map[ng.name]})
instances_list = []
try:
instances_list = _scale_cluster_instances(
cluster, node_groups_map, plugin)
_clean_cluster_from_empty_ng(cluster)
_await_instances(cluster)
volumes.attach_to_instances(instances_list)
except Exception as ex:
LOG.warn("Can't scale cluster '%s' (reason: %s)", cluster.name, ex)
with excutils.save_and_reraise_exception():
_rollback_cluster_scaling(cluster, instances_list, ex)
instances_list = []
_clean_cluster_from_empty_ng(cluster)
if cluster.status == 'Decommissioning':
context.model_update(cluster, status='Error')
else:
context.model_update(cluster, status='Active')
# we should be here with valid cluster: if instances creation
# was not successful all extra-instances will be removed above
if instances_list:
_configure_instances(cluster)
return instances_list
def scale_cluster(cluster_id, data):
cluster = get_cluster(id=cluster_id)
plugin = plugin_base.PLUGINS.get_plugin(cluster.plugin_name)
existing_node_groups = data.get("resize_node_groups", [])
additional_node_groups = data.get("add_node_groups", [])
# the next map is the main object we will work with
# to_be_enlarged : {node_group_name: desired_amount_of_instances}
to_be_enlarged = {}
for ng in existing_node_groups:
to_be_enlarged.update({ng["name"]: ng["count"]})
additional = construct_ngs_for_scaling(additional_node_groups)
try:
context.model_update(cluster, status="Validating")
plugin.validate_scaling(cluster, to_be_enlarged, additional)
except Exception:
with excutils.save_and_reraise_exception():
context.model_update(cluster, status="Active")
# If we are here validation is successful.
# So let's update bd and to_be_enlarged map:
for add_n_g in additional:
cluster.node_groups.append(add_n_g)
to_be_enlarged.update({add_n_g.name: additional[add_n_g]})
context.model_save(cluster)
context.spawn(_provision_nodes, cluster_id, to_be_enlarged)
return cluster
def terminate_cluster(**args):
cluster = get_cluster(**args)
context.model_update(cluster, status="Deleting")
plugin = plugin_base.PLUGINS.get_plugin(cluster.plugin_name)
plugin.on_terminate_cluster(cluster)
i.shutdown_cluster(cluster)
s.terminate_cluster(cluster)
def test_model_update(self):
_insert_test_object()
t = context.current().session.query(TestModel).first()
context.model_update(t, test_field=42)
db_t = context.model_query(TestModel).first()
self.assertEqual(t.id, db_t.id)
self.assertEqual(42, db_t.test_field)
def create_cluster(values):
cluster = s.create_cluster(values)
plugin = plugin_base.PLUGINS.get_plugin(cluster.plugin_name)
# validating cluster
try:
context.model_update(cluster, status="Validating")
plugin.validate(cluster)
except Exception as ex:
with excutils.save_and_reraise_exception():
context.model_update(cluster, status="Error", status_description=str(ex))
context.spawn(_provision_cluster, cluster.id)
return cluster
def _provision_nodes(cluster_id, node_group_names_map):
cluster = get_cluster(id=cluster_id)
plugin = plugin_base.PLUGINS.get_plugin(cluster.plugin_name)
context.model_update(cluster, status="Scaling")
instances = i.scale_cluster(cluster, node_group_names_map, plugin)
if instances:
context.model_update(cluster, status="Configuring")
plugin.scale_cluster(cluster, instances)
# cluster is now up and ready
context.model_update(cluster, status="Active")
def create_cluster(cluster):
try:
# create all instances
context.model_update(cluster, status='Spawning')
_create_instances(cluster)
# wait for all instances are up and accessible
context.model_update(cluster, status='Waiting')
_await_instances(cluster)
# attach volumes
volumes.attach(cluster)
# prepare all instances
context.model_update(cluster, status='Preparing')
_configure_instances(cluster)
except Exception as ex:
LOG.warn("Can't start cluster '%s' (reason: %s)", cluster.name, ex)
with excutils.save_and_reraise_exception():
context.model_update(cluster, status='Error',
status_description=str(ex))
_rollback_cluster_creation(cluster, ex)
def _provision_cluster(cluster_id):
cluster = get_cluster(id=cluster_id)
plugin = plugin_base.PLUGINS.get_plugin(cluster.plugin_name)
# updating cluster infra
context.model_update(cluster, status="InfraUpdating")
plugin.update_infra(cluster)
# creating instances and configuring them
i.create_cluster(cluster)
# configure cluster
context.model_update(cluster, status="Configuring")
plugin.configure_cluster(cluster)
# starting prepared and configured cluster
context.model_update(cluster, status="Starting")
plugin.start_cluster(cluster)
# cluster is now up and ready
context.model_update(cluster, status="Active")
return cluster
