107 lines
3.5 KiB
Python
107 lines
3.5 KiB
Python
#
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# Copyright 2012 New Dream Network, LLC (DreamHost)
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#
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# Licensed under the Apache License, Version 2.0 (the "License"); you may
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# not use this file except in compliance with the License. You may obtain
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# a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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# License for the specific language governing permissions and limitations
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# under the License.
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import threading
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from oslo_config import cfg
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from oslo_log import log
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import oslo_messaging
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from pecan import hooks
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from ceilometer.i18n import _LE
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from ceilometer import messaging
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from ceilometer import storage
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LOG = log.getLogger(__name__)
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cfg.CONF.import_opt('telemetry_driver', 'ceilometer.publisher.messaging',
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group='publisher_notifier')
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class ConfigHook(hooks.PecanHook):
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"""Attach the configuration object to the request.
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That allows controllers to get it.
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"""
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@staticmethod
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def before(state):
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state.request.cfg = cfg.CONF
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class DBHook(hooks.PecanHook):
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def __init__(self):
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self.storage_connection = DBHook.get_connection('metering')
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self.event_storage_connection = DBHook.get_connection('event')
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self.alarm_storage_connection = DBHook.get_connection('alarm')
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if (not self.storage_connection and
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not self.event_storage_connection and
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not self.alarm_storage_connection):
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raise Exception("Api failed to start. Failed to connect to "
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"databases, purpose: %s" %
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', '.join(['metering', 'event', 'alarm']))
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def before(self, state):
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state.request.storage_conn = self.storage_connection
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state.request.event_storage_conn = self.event_storage_connection
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state.request.alarm_storage_conn = self.alarm_storage_connection
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@staticmethod
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def get_connection(purpose):
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try:
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return storage.get_connection_from_config(cfg.CONF, purpose)
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except Exception as err:
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params = {"purpose": purpose, "err": err}
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LOG.exception(_LE("Failed to connect to db, purpose %(purpose)s "
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"retry later: %(err)s") % params)
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class NotifierHook(hooks.PecanHook):
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"""Create and attach a notifier to the request.
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Usually, samples will be push to notification bus by notifier when they
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are posted via /v2/meters/ API.
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"""
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def __init__(self):
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transport = messaging.get_transport()
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self.notifier = oslo_messaging.Notifier(
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transport, driver=cfg.CONF.publisher_notifier.telemetry_driver,
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publisher_id="ceilometer.api")
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def before(self, state):
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state.request.notifier = self.notifier
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class TranslationHook(hooks.PecanHook):
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def __init__(self):
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# Use thread local storage to make this thread safe in situations
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# where one pecan instance is being used to serve multiple request
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# threads.
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self.local_error = threading.local()
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self.local_error.translatable_error = None
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def before(self, state):
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self.local_error.translatable_error = None
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def after(self, state):
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if hasattr(state.response, 'translatable_error'):
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self.local_error.translatable_error = (
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state.response.translatable_error)
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