+ measures = self.client.metric.get_measures(
+ openstack_metric_name,
+ aggregation=aggregation,
+ start=time.time() - 1200,
+ resource_id=resource_id,
+ )
+ if measures:
+ value = measures[-1][2]
+ except (
+ gnocchiclient.exceptions.NotFound,
+ gnocchiclient.exceptions.BadRequest,
+ TypeError,
+ ) as e:
+ # CPU metric in previous Openstack versions do not support rate:mean aggregation method
+ # Gnocchi in some Openstack versions raise TypeError instead of NotFound or BadRequest
+ if openstack_metric_name == "cpu":
+ log.debug(
+ "No metric %s found for instance %s: %s",
+ openstack_metric_name,
+ resource_id,
+ e,
+ )
+ log.info(
+ "Retrying to get metric %s for instance %s without aggregation",
+ openstack_metric_name,
+ resource_id,
+ )
+ measures = self.client.metric.get_measures(
+ openstack_metric_name, resource_id=resource_id, limit=1
+ )
+ else:
+ raise e
+ # measures[-1] is the last measure
+ # measures[-2] is the previous measure
+ # measures[x][2] is the value of the metric
+ if measures and len(measures) >= 2:
+ value = measures[-1][2] - measures[-2][2]
+ if value:
+ # measures[-1][0] is the time of the reporting interval
+ # measures[-1][1] is the duration of the reporting interval
+ if aggregation:
+ # If this is an aggregate, we need to divide the total over the reported time period.
+ # Even if the aggregation method is not supported by Openstack, the code will execute it
+ # because aggregation is specified in METRIC_AGGREGATORS
+ value = value / measures[-1][1]
+ if openstack_metric_name in METRIC_MULTIPLIERS:
+ value = value * METRIC_MULTIPLIERS[openstack_metric_name]
+ except gnocchiclient.exceptions.NotFound as e:
+ log.debug(
+ "No metric %s found for instance %s: %s",
+ openstack_metric_name,
+ resource_id,
+ e,
+ )
+ return value
+
+
+class CeilometerBackend(OpenstackBackend):
+ def __init__(self, vim_account: dict, vim_session: object):
+ self.client = self._build_ceilometer_client(vim_account, vim_session)
+
+ def _build_ceilometer_client(self, vim_account: dict, vim_session: object) -> ceilometer_client.Client:
+ return ceilometer_client.Client("2", session=vim_session)
+
+ def collect_metric(
+ self, metric_type: MetricType, metric_name: str, resource_id: str
+ ):
+ if metric_type != MetricType.INSTANCE:
+ raise NotImplementedError(
+ "Ceilometer backend only support instance metrics"
+ )
+ measures = self.client.samples.list(
+ meter_name=metric_name,
+ limit=1,
+ q=[{"field": "resource_id", "op": "eq", "value": resource_id}],
+ )
+ return measures[0].counter_volume if measures else None