/usr/lib/python2.7/dist-packages/gnocchi/rest/app.py is in python-gnocchi 3.0.4-3.
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#
# Copyright © 2014-2015 eNovance
#
# 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 os
import uuid
from oslo_config import cfg
from oslo_log import log
from oslo_middleware import cors
from oslo_policy import policy
from paste import deploy
import pecan
import webob.exc
from gnocchi import exceptions
from gnocchi import indexer as gnocchi_indexer
from gnocchi import json
from gnocchi import service
from gnocchi import storage as gnocchi_storage
LOG = log.getLogger(__name__)
class GnocchiHook(pecan.hooks.PecanHook):
def __init__(self, storage, indexer, conf):
self.storage = storage
self.indexer = indexer
self.conf = conf
self.policy_enforcer = policy.Enforcer(conf)
def on_route(self, state):
state.request.storage = self.storage
state.request.indexer = self.indexer
state.request.conf = self.conf
state.request.policy_enforcer = self.policy_enforcer
class OsloJSONRenderer(object):
@staticmethod
def __init__(*args, **kwargs):
pass
@staticmethod
def render(template_path, namespace):
return json.dumps(namespace)
class NotImplementedMiddleware(object):
def __init__(self, app):
self.app = app
def __call__(self, environ, start_response):
try:
return self.app(environ, start_response)
except exceptions.NotImplementedError:
raise webob.exc.HTTPNotImplemented(
"Sorry, this Gnocchi server does "
"not implement this feature 😞")
# NOTE(sileht): pastedeploy uses ConfigParser to handle
# global_conf, since python 3 ConfigParser doesn't
# allow to store object as config value, only strings are
# permit, so to be able to pass an object created before paste load
# the app, we store them into a global var. But the each loaded app
# store it's configuration in unique key to be concurrency safe.
global APPCONFIGS
APPCONFIGS = {}
def load_app(conf, appname=None, indexer=None, storage=None,
not_implemented_middleware=True):
global APPCONFIGS
# NOTE(sileht): We load config, storage and indexer,
# so all
if not storage:
storage = gnocchi_storage.get_driver(conf)
if not indexer:
indexer = gnocchi_indexer.get_driver(conf)
indexer.connect()
# Build the WSGI app
cfg_path = conf.api.paste_config
if not os.path.isabs(cfg_path):
cfg_path = conf.find_file(cfg_path)
if cfg_path is None or not os.path.exists(cfg_path):
raise cfg.ConfigFilesNotFoundError([conf.api.paste_config])
config = dict(conf=conf, indexer=indexer, storage=storage,
not_implemented_middleware=not_implemented_middleware)
configkey = str(uuid.uuid4())
APPCONFIGS[configkey] = config
LOG.info("WSGI config used: %s" % cfg_path)
app = deploy.loadapp("config:" + cfg_path, name=appname,
global_conf={'configkey': configkey})
return cors.CORS(app, conf=conf)
def _setup_app(root, conf, indexer, storage, not_implemented_middleware):
app = pecan.make_app(
root,
debug=conf.api.pecan_debug,
hooks=(GnocchiHook(storage, indexer, conf),),
guess_content_type_from_ext=False,
custom_renderers={'json': OsloJSONRenderer},
)
if not_implemented_middleware:
app = webob.exc.HTTPExceptionMiddleware(NotImplementedMiddleware(app))
return app
def app_factory(global_config, **local_conf):
global APPCONFIGS
appconfig = APPCONFIGS.get(global_config.get('configkey'))
return _setup_app(root=local_conf.get('root'), **appconfig)
def build_wsgi_app():
return load_app(service.prepare_service())
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