Source code for ceilometer.api.hooks

#
# 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.

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')


[docs]class ConfigHook(hooks.PecanHook): """Attach the configuration object to the request. That allows controllers to get it. """ @staticmethod
[docs] def before(state): state.request.cfg = cfg.CONF
[docs]class DBHook(hooks.PecanHook): def __init__(self): self.storage_connection = DBHook.get_connection('metering') self.event_storage_connection = DBHook.get_connection('event') if (not self.storage_connection and not self.event_storage_connection): raise Exception("Api failed to start. Failed to connect to " "databases, purpose: %s" % ', '.join(['metering', 'event']))
[docs] def before(self, state): state.request.storage_conn = self.storage_connection state.request.event_storage_conn = self.event_storage_connection
@staticmethod
[docs] 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)
[docs]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")
[docs] def before(self, state): state.request.notifier = self.notifier
[docs]class TranslationHook(hooks.PecanHook):
[docs] def after(self, state): # After a request has been done, we need to see if # ClientSideError has added an error onto the response. # If it has we need to get it info the thread-safe WSGI # environ to be used by the ParsableErrorMiddleware. if hasattr(state.response, 'translatable_error'): state.request.environ['translatable_error'] = ( state.response.translatable_error)

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