ceilometer.api.hooks

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_log import log
import oslo_messaging
from oslo_policy import policy

from pecan import hooks

from ceilometer import messaging
from ceilometer import storage

LOG = log.getLogger(__name__)


[docs]class ConfigHook(hooks.PecanHook): """Attach the configuration object to the request. That allows controllers to get it. """ def __init__(self, conf): super(ConfigHook, self).__init__() self.conf = conf self.enforcer = policy.Enforcer(conf) self.enforcer.load_rules()
[docs] def on_route(self, state): state.request.cfg = self.conf state.request.enforcer = self.enforcer
[docs]class DBHook(hooks.PecanHook): def __init__(self, conf): self.storage_connection = self.get_connection(conf) if not self.storage_connection: raise Exception( "API failed to start. Failed to connect to database")
[docs] def before(self, state): state.request.storage_conn = self.storage_connection
[docs] @staticmethod def get_connection(conf): try: return storage.get_connection_from_config(conf) except Exception as err: LOG.exception("Failed to connect to db" "retry later: %s", err)
[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, conf): transport = messaging.get_transport(conf) self.notifier = oslo_messaging.Notifier( transport, driver=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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