def _add_equivalence(self, equivalence):
for entity in equivalence:
if entity in self.entity_equivalences:
# TODO(yujunz): log error and continue processing the rest
raise VitrageError('one entity should not be included in '
'multiple equivalence definitions')
self.entity_equivalences[entity] = equivalence
def _get_single_graph_vertex_by_props(self, vertex, include_deleted=False):
"""Returns a single vertex by it's defining properties
Queries the graph DB for vertices according to the
vertice's "key" properties
In case multiple vertices return from the query,
an exception is issued
:param updated_vertex: The vertex with the defining properties
:type vertex: Vertex
:param include_deleted: Include deleted entities in the query
:type include_deleted: bool
"""
received_graph_vertices = self.entity_graph.get_vertices_by_key(
PUtils.get_defining_properties(vertex))
graph_vertices = []
if include_deleted:
for tmp_vertex in received_graph_vertices:
graph_vertices.append(tmp_vertex)
else:
for tmp_vertex in received_graph_vertices:
if not tmp_vertex.get(VProps.IS_DELETED, False):
graph_vertices.append(tmp_vertex)
if len(graph_vertices) > 1:
raise VitrageError(
'found too many vertices with same properties: %s ', vertex)
graph_vertex = None if not graph_vertices else graph_vertices[0]
return graph_vertex
def _rollback_to_default(self, templates):
try:
for t in templates:
db_row = vitrage_utils.get_first_template(name=t)
vitrage_utils.delete_template(db_row['uuid'])
except Exception as e:
raise VitrageError('Rollback to default failed %s', e)
def submit_template_event(self, event):
"""Template worker to load the new/deleted template
Load the template to scenario-evaluator and run it on the entire graph
"""
template_action = event.get(TEMPLATE_ACTION)
if template_action == ADD:
templates = self._db.templates.query(status=TStatus.LOADING)
new_status = TStatus.ACTIVE
action_mode = ActionMode.DO
elif template_action == DELETE:
templates = self._db.templates.query(status=TStatus.DELETING)
new_status = TStatus.DELETED
action_mode = ActionMode.UNDO
else:
raise VitrageError('Invalid template_action %s' % template_action)
self._submit_and_wait(self._template_queues, (
TEMPLATE_ACTION,
[t.name for t in templates if t.template_type == TType.STANDARD],
action_mode,
))
for t in templates:
self._db.templates.update(t.uuid, 'status', new_status)
def extract_var(symbol_name):
if symbol_name in entities:
return entities[symbol_name], ENTITY
elif symbol_name in relationships:
return relationships[symbol_name], RELATIONSHIP
else:
raise VitrageError(
'invalid symbol name: {}'.format(symbol_name))
def _default_root_id(self):
tmp_vertices = self.entity_graph.get_vertices(
vertex_attr_filter={VProps.VITRAGE_TYPE: OPENSTACK_CLUSTER})
if not tmp_vertices:
LOG.debug("No root vertex found")
return None
if len(tmp_vertices) > 1:
raise VitrageError("Multiple root vertices found")
return tmp_vertices[0].vertex_id
def _show_template(uuid):
try:
templates = pecan.request.storage.templates.query(uuid=uuid)
if not templates:
raise VitrageError("Template %s not found", uuid)
return templates[0].file_content
except Exception:
LOG.exception('Failed to show template with uuid: %s ', uuid)
abort(404, 'Failed to show template.')
def _show_template(_id):
uuid = TemplateController._to_uuid(_id)
try:
templates = pecan.request.storage.templates.query(uuid=uuid)
if not templates or templates[0].status == TStatus.DELETED:
raise VitrageError("Template %s not found", uuid)
return templates[0].file_content
except Exception:
LOG.exception('Failed to show template with uuid: %s ', uuid)
abort(404, 'Failed to show template.')
def _show_template(uuid):
try:
templates = pecan.request.storage.templates.query(uuid=uuid)
if not templates:
raise VitrageError("Template %s not found", uuid)
return templates[0].file_content
except Exception as e:
to_unicode = encodeutils.exception_to_unicode(e)
LOG.exception('failed to show template with uuid: %s ', to_unicode)
abort(404, to_unicode)
def _validate_template(db, template, template_type):
if template_type == TType.DEFINITION:
result = template_validation.validate_definition_template(template)
elif template_type == TType.STANDARD:
result = template_validation.validate_template(template,
_load_def_templates(db))
elif template_type == TType.EQUIVALENCE:
result = base.Result("", True, "", "No Validation")
else:
raise VitrageError("Unknown template type %s", template_type)
return result
def add_api_workers(self):
"""Add Api workers
Api workers receive all graph updates, hence are updated.
Each template worker holds a disabled scenario-evaluator that does
not process changes.
These also hold a rpc server and process the incoming Api calls
"""
if self._api_queues:
raise VitrageError('add_api_workers called more than once')
workers = self._conf.api.workers
queues = [multiprocessing.Queue() for i in range(workers)]
self.add(ApiWorker, args=(self._conf, queues), workers=workers)
self._api_queues = queues
self._all_queues.extend(queues)
def add_evaluator_workers(self):
"""Add evaluator workers
Evaluator workers receive all graph updates, hence are updated.
Each evaluator worker holds an enabled scenario-evaluator and process
every change.
Each worker's scenario-evaluator runs different template scenarios.
Interface to these workers is:
submit_graph_update(..)
submit_start_evaluations(..)
submit_evaluators_reload_templates(..)
"""
if self._evaluator_queues:
raise VitrageError('add_evaluator_workers called more than once')
workers = CONF.evaluator.workers
queues = [multiprocessing.JoinableQueue() for i in range(workers)]
self.add(EvaluatorWorker, args=(queues, workers), workers=workers)
self._evaluator_queues = queues
self._all_queues.extend(queues)
def _build_equivalences(equivalence_defs):
"""equivalence stored as arrays of frozen entity props sets
equivalences:: [equivalence, ...]
equivalence:: {entity_props, ...}
entity_props:: {(k,v), ...}
"""
equivalences = []
for equivalence_def in equivalence_defs:
equivalent_entities = equivalence_def[Fields.EQUIVALENCE]
equivalence = set()
for entity_def in equivalent_entities:
entity_props = {(k, v)
for k, v in entity_def[Fields.ENTITY].items()}
entity_key = frozenset(entity_props)
if entity_key in equivalence:
raise VitrageError('duplicated entities found in '
'equivalence')
equivalence.add(entity_key)
equivalences.append(frozenset(equivalence))
return equivalences
def add_template_workers(self):
"""Add template workers
Template workers receive all graph updates, hence are updated.
Each template worker holds a disabled scenario-evaluator that does
not process changes.
The scenario-evaluator is enabled when a template add/delete arrives,
so this worker will run the added template on the entire graph.
Interface to these workers is:
submit_graph_update(..)
submit_template_event(..)
"""
if self._template_queues:
raise VitrageError('add_template_workers called more than once')
workers = 1 # currently more than one worker is not supported
queues = [multiprocessing.JoinableQueue() for i in range(workers)]
self.add(TemplateLoaderWorker,
args=(self._conf, queues, self._entity_graph),
workers=workers)
self._template_queues = queues
self._all_queues.extend(queues)
def create_predicate(query_dict):
"""Create predicate from a logical and/or/==/>/etc expression
Example Input:
--------------
query_dict = {
'and': [
{'==': {'TYPE': 'ALARM'}},
{'or': [
{'>': {'TIME': 150}},
{'==': {'IS_DELETED': True}}
]}
]
}
Example Output:
--------------
lambda item: ((item['TYPE']== 'ALARM') and
((item['TIME']> 150) or (item['IS_DELETED']== True)))
Example Usage:
--------------
match = create_predicate(query_dict)
if match(vertex):
print vertex
:param query_dict:
:return: a predicate "match(item)"
"""
try:
expression = _create_query_expression(query=query_dict)
LOG.debug('create_predicate::%s', expression)
expression = 'lambda item: ' + expression
return eval(expression)
except Exception as e:
LOG.error('invalid query format %s. Exception: %s',
query_dict, e)
raise VitrageError('invalid query format %s. Exception: %s',
query_dict, e)
def _create_query_expression(query, parent_operator=None):
expressions = []
# First element or element under logical operation
if not parent_operator and isinstance(query, dict):
(key, value) = query.copy().popitem()
return _create_query_expression(value, key)
# Continue recursion on logical (and/or) operation
elif parent_operator in logical_operations and isinstance(query, list):
for val in query:
expressions.append(_create_query_expression(val))
return _join_logical_operator(parent_operator, expressions)
# Recursion evaluate leaf (stop condition)
elif parent_operator in operators:
for key, val in query.items():
expressions.append('item.get(' + _evaluable_str(key) + ')' +
parent_operator + ' ' + _evaluable_str(val))
return _join_logical_operator('and', expressions)
else:
raise VitrageError('invalid partial query format', parent_operator,
query)
def _create_entity_graph(cls, name, num_of_alarms_per_host,
num_of_alarms_per_vm,
num_of_hosts_per_node,
num_of_vms_per_host,
num_of_tests_per_host):
start = time.time()
g = NXGraph(name)
g.add_vertex(v_node)
g.add_vertex(v_switch)
g.add_edge(e_node_to_switch)
# Add Hosts
for host_id in range(num_of_hosts_per_node):
host_to_add = add_connected_vertex(g,
RESOURCE,
NOVA_HOST_DATASOURCE,
host_id,
ELabel.CONTAINS,
v_node,
True)
g.add_edge(graph_utils.create_edge(host_to_add.vertex_id,
v_switch.vertex_id, 'USES'))
# Add Host Alarms
for j in range(num_of_alarms_per_host):
add_connected_vertex(g, ALARM, ALARM_ON_HOST,
cls.host_alarm_id, ELabel.ON,
host_to_add, False,
{VProps.RESOURCE_ID: host_id,
VProps.NAME: host_id})
cls.host_alarm_id += 1
# Add Host Tests
for j in range(num_of_tests_per_host):
add_connected_vertex(g, TEST, TEST_ON_HOST, cls.host_test_id,
ELabel.ON, host_to_add)
cls.host_test_id += 1
# Add Host Vms
for j in range(num_of_vms_per_host):
vm_to_add = add_connected_vertex(g,
RESOURCE,
NOVA_INSTANCE_DATASOURCE,
cls.vm_id,
ELabel.CONTAINS,
host_to_add,
True)
cls.vm_id += 1
cls.vms.append(vm_to_add)
# Add Instance Alarms
for k in range(num_of_alarms_per_vm):
add_connected_vertex(g, ALARM, ALARM_ON_VM,
cls.vm_alarm_id, ELabel.ON,
vm_to_add, False,
{VProps.RESOURCE_ID: cls.vm_id - 1,
VProps.NAME: cls.vm_id - 1})
cls.vm_alarm_id += 1
end = time.time()
LOG.debug('Graph creation took ' + str(end - start) +
' seconds, size is: ' + str(len(g)))
expected_graph_size = \
2 + num_of_hosts_per_node + num_of_hosts_per_node * \
num_of_alarms_per_host + num_of_hosts_per_node * \
num_of_vms_per_host + num_of_hosts_per_node * \
num_of_vms_per_host * num_of_alarms_per_vm + \
num_of_tests_per_host * num_of_hosts_per_node
if not expected_graph_size == len(g):
raise VitrageError('Init failed, graph size unexpected {0} != {1}'
.format(expected_graph_size, len(g)))
return g
