Source code for ceilometer.api.app

#
# Copyright 2012 New Dream Network, LLC (DreamHost)
#
# Author: Doug Hellmann <doug.hellmann@dreamhost.com>
#
# 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 logging
import os
import socket
from wsgiref import simple_server

import netaddr
from oslo.config import cfg
from paste import deploy
import pecan

from ceilometer.api import config as api_config
from ceilometer.api import hooks
from ceilometer.api import middleware
from ceilometer.openstack.common import log
from ceilometer import storage

LOG = log.getLogger(__name__)

CONF = cfg.CONF
CONF.import_opt('debug', 'ceilometer.openstack.common.log')

auth_opts = [
    cfg.StrOpt('api_paste_config',
               default="api_paste.ini",
               help="Configuration file for WSGI definition of API."
               ),
]

api_opts = [
    cfg.BoolOpt('pecan_debug',
                default=CONF.debug,
                help='Toggle Pecan Debug Middleware. '
                'Defaults to global debug value.'
                ),
]

CONF.register_opts(auth_opts)
CONF.register_opts(api_opts, group='api')


def get_pecan_config():
    # Set up the pecan configuration
    filename = api_config.__file__.replace('.pyc', '.py')
    return pecan.configuration.conf_from_file(filename)


def setup_app(pecan_config=None, extra_hooks=None):
    # FIXME: Replace DBHook with a hooks.TransactionHook
    app_hooks = [hooks.ConfigHook(),
                 hooks.DBHook(
                     storage.get_connection_from_config(cfg.CONF, 'metering'),
                     storage.get_connection_from_config(cfg.CONF, 'alarm'),),
                 hooks.PipelineHook(),
                 hooks.TranslationHook()]
    if extra_hooks:
        app_hooks.extend(extra_hooks)

    if not pecan_config:
        pecan_config = get_pecan_config()

    pecan.configuration.set_config(dict(pecan_config), overwrite=True)

    app = pecan.make_app(
        pecan_config.app.root,
        static_root=pecan_config.app.static_root,
        template_path=pecan_config.app.template_path,
        debug=CONF.api.pecan_debug,
        force_canonical=getattr(pecan_config.app, 'force_canonical', True),
        hooks=app_hooks,
        wrap_app=middleware.ParsableErrorMiddleware,
        guess_content_type_from_ext=False
    )

    return app


[docs]class VersionSelectorApplication(object): def __init__(self): pc = get_pecan_config() pc.app.debug = CONF.api.pecan_debug def not_found(environ, start_response): start_response('404 Not Found', []) return [] self.v1 = not_found self.v2 = setup_app(pecan_config=pc) def __call__(self, environ, start_response): if environ['PATH_INFO'].startswith('/v1/'): return self.v1(environ, start_response) return self.v2(environ, start_response)
def get_server_cls(host): """Return an appropriate WSGI server class base on provided host :param host: The listen host for the ceilometer API server. """ server_cls = simple_server.WSGIServer if netaddr.valid_ipv6(host): # NOTE(dzyu) make sure use IPv6 sockets if host is in IPv6 pattern if getattr(server_cls, 'address_family') == socket.AF_INET: class server_cls(server_cls): address_family = socket.AF_INET6 return server_cls def get_handler_cls(): cls = simple_server.WSGIRequestHandler # old-style class doesn't support super class CeilometerHandler(cls, object): def address_string(self): if cfg.CONF.api.enable_reverse_dns_lookup: return super(CeilometerHandler, self).address_string() else: # disable reverse dns lookup, directly return ip address return self.client_address[0] return CeilometerHandler def load_app(): # Build the WSGI app cfg_file = None cfg_path = cfg.CONF.api_paste_config if not os.path.isabs(cfg_path): cfg_file = CONF.find_file(cfg_path) elif os.path.exists(cfg_path): cfg_file = cfg_path if not cfg_file: raise cfg.ConfigFilesNotFoundError([cfg.CONF.api_paste_config]) LOG.info("Full WSGI config used: %s" % cfg_file) return deploy.loadapp("config:" + cfg_file) def build_server(): app = load_app() # Create the WSGI server and start it host, port = cfg.CONF.api.host, cfg.CONF.api.port server_cls = get_server_cls(host) srv = simple_server.make_server(host, port, app, server_cls, get_handler_cls()) LOG.info(_('Starting server in PID %s') % os.getpid()) LOG.info(_("Configuration:")) cfg.CONF.log_opt_values(LOG, logging.INFO) if host == '0.0.0.0': LOG.info(_( 'serving on 0.0.0.0:%(sport)s, view at http://127.0.0.1:%(vport)s') % ({'sport': port, 'vport': port})) else: LOG.info(_("serving on http://%(host)s:%(port)s") % ( {'host': host, 'port': port})) return srv def app_factory(global_config, **local_conf): return VersionSelectorApplication()