deb-ceilometer/ceilometer/api/hooks.py
liu-sheng 9ad75552c5 Add support for posting samples to notification-agent via API
This change make the ceilometer-api getting rid the pipeline. samples will
be push to notification bus when creating via /v2/meters API.

To avoid the ceilometer-api's dependency of notification-agent, especially
in some testing scenarios, this change also provide a optional parameter
that allow samples posted to storage directly.

NOTE: This change reverting the reverted patch[1] and merging it with
patch[2], the original patch[1] has caused the related bug so has been
reverted by patch[3], the patch[2] tried to fix the related bug before
the patch[1] been reverted.

[1] https://review.openstack.org/#/c/193472/

[2] https://review.openstack.org/#/c/195866/

[3] https://review.openstack.org/#/c/195570/

Related-bug: #1468697
Partially implements: blueprint api-no-pipeline

Change-Id: I88cbd83910dcf79bed8a0f9616f98e4346362ab3
2015-06-27 12:46:28 +00:00

107 lines
3.5 KiB
Python

#
# Copyright 2012 New Dream Network, LLC (DreamHost)
#
# 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 threading
from oslo_config import cfg
from oslo_log import log
import oslo_messaging
from pecan import hooks
from ceilometer.i18n import _LE
from ceilometer import messaging
from ceilometer import storage
LOG = log.getLogger(__name__)
cfg.CONF.import_opt('telemetry_driver', 'ceilometer.publisher.messaging',
group='publisher_notifier')
class ConfigHook(hooks.PecanHook):
"""Attach the configuration object to the request.
That allows controllers to get it.
"""
@staticmethod
def before(state):
state.request.cfg = cfg.CONF
class DBHook(hooks.PecanHook):
def __init__(self):
self.storage_connection = DBHook.get_connection('metering')
self.event_storage_connection = DBHook.get_connection('event')
self.alarm_storage_connection = DBHook.get_connection('alarm')
if (not self.storage_connection and
not self.event_storage_connection and
not self.alarm_storage_connection):
raise Exception("Api failed to start. Failed to connect to "
"databases, purpose: %s" %
', '.join(['metering', 'event', 'alarm']))
def before(self, state):
state.request.storage_conn = self.storage_connection
state.request.event_storage_conn = self.event_storage_connection
state.request.alarm_storage_conn = self.alarm_storage_connection
@staticmethod
def get_connection(purpose):
try:
return storage.get_connection_from_config(cfg.CONF, purpose)
except Exception as err:
params = {"purpose": purpose, "err": err}
LOG.exception(_LE("Failed to connect to db, purpose %(purpose)s "
"retry later: %(err)s") % params)
class NotifierHook(hooks.PecanHook):
"""Create and attach a notifier to the request.
Usually, samples will be push to notification bus by notifier when they
are posted via /v2/meters/ API.
"""
def __init__(self):
transport = messaging.get_transport()
self.notifier = oslo_messaging.Notifier(
transport, driver=cfg.CONF.publisher_notifier.telemetry_driver,
publisher_id="ceilometer.api")
def before(self, state):
state.request.notifier = self.notifier
class TranslationHook(hooks.PecanHook):
def __init__(self):
# Use thread local storage to make this thread safe in situations
# where one pecan instance is being used to serve multiple request
# threads.
self.local_error = threading.local()
self.local_error.translatable_error = None
def before(self, state):
self.local_error.translatable_error = None
def after(self, state):
if hasattr(state.response, 'translatable_error'):
self.local_error.translatable_error = (
state.response.translatable_error)