#
# 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] @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]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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