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# Copyright 2014 Mirantis Inc.
# All Rights Reserved.
#
# 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
# under the License.
import logging
from osprofiler.drivers import base
LOG = logging.getLogger(__name__)
def _noop_notifier(info, context=None):
"""Do nothing on notify()."""
# NOTE(boris-42): By default we are using noop notifier.
__notifier = _noop_notifier
__notifier_cache = {} # map: connection-string -> notifier
def notify(info):
"""Passes the profiling info to the notifier callable.
:param info: dictionary with profiling information
"""
__notifier(info)
def get():
"""Returns notifier callable."""
return __notifier
def set(notifier):
"""Service that are going to use profiler should set callable notifier.
Callable notifier is instance of callable object, that accept exactly
one argument "info". "info" - is dictionary of values that contains
profiling information.
"""
global __notifier
__notifier = notifier
def create(connection_string, *args, **kwargs):
"""Create notifier based on specified plugin_name
:param connection_string: connection string which specifies the storage
driver for notifier
:param args: args that will be passed to the driver's __init__ method
:param kwargs: kwargs that will be passed to the driver's __init__ method
:returns: Callable notifier method
"""
global __notifier_cache
if connection_string not in __notifier_cache:
try:
driver = base.get_driver(connection_string, *args, **kwargs)
__notifier_cache[connection_string] = driver.notify
LOG.info("osprofiler is enabled with connection string: %s",
connection_string)
except Exception:
LOG.exception("Could not initialize driver for connection string "
"%s, osprofiler is disabled", connection_string)
__notifier_cache[connection_string] = _noop_notifier
return __notifier_cache[connection_string]
def clear_notifier_cache():
__notifier_cache.clear()
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