Source code for ironic.common.metrics_utils

# Copyright 2016 Rackspace Hosting
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#
#    Licensed under the Apache License, Version 2.0 (the "License"); you may
#    not use this file except in compliance with the License. You may obtain
#    a copy of the License at
#
#         http://www.apache.org/licenses/LICENSE-2.0
#
#    Unless required by applicable law or agreed to in writing, software
#    distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
#    WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
#    License for the specific language governing permissions and limitations
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from oslo_config import cfg

from ironic.common import exception
from ironic.common.i18n import _
from ironic.common import metrics
from ironic.common import metrics_collector
from ironic.common import metrics_statsd


CONF = cfg.CONF


[docs] def get_metrics_logger(prefix='', backend=None, host=None, delimiter='.'): """Return a metric logger with the specified prefix. The format of the prefix is: [global_prefix<delim>][host_name<delim>]prefix where <delim> is the delimiter (default is '.') :param prefix: Prefix for this metric logger. Value should be a string or None. :param backend: Backend to use for the metrics system. Possible values are 'noop' and 'statsd'. :param host: Name of this node. :param delimiter: Delimiter to use for the metrics name. :return: The new MetricLogger. """ if not isinstance(prefix, str): msg = (_("This metric prefix (%s) is of unsupported type. " "Value should be a string or None") % str(prefix)) raise exception.InvalidMetricConfig(msg) if CONF.metrics.prepend_host and host: if CONF.metrics.prepend_host_reverse: host = '.'.join(reversed(host.split('.'))) if prefix: prefix = delimiter.join([host, prefix]) else: prefix = host if CONF.metrics.global_prefix: if prefix: prefix = delimiter.join([CONF.metrics.global_prefix, prefix]) else: prefix = CONF.metrics.global_prefix backend = backend or CONF.metrics.backend if backend == 'statsd': return metrics_statsd.StatsdMetricLogger(prefix, delimiter=delimiter) elif backend == 'noop': return metrics.NoopMetricLogger(prefix, delimiter=delimiter) elif backend == 'collector': return metrics_collector.DictCollectionMetricLogger( prefix, delimiter=delimiter) else: msg = (_("The backend is set to an unsupported type: " "%s. Value should be 'noop' or 'statsd'.") % backend) raise exception.InvalidMetricConfig(msg)