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# vim: tabstop=4 shiftwidth=4 softtabstop=4
# Copyright 2012 OpenStack LLC
#
# 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.path
from keystone.catalog.backends import kvs
from keystone.catalog import core
from keystone.common import logging
from keystone import config
LOG = logging.getLogger(__name__)
CONF = config.CONF
config.register_str('template_file',
default='default_catalog.templates',
group='catalog')
def parse_templates(template_lines):
o = {}
for line in template_lines:
if ' = ' not in line:
continue
k, v = line.strip().split(' = ')
if not k.startswith('catalog.'):
continue
parts = k.split('.')
region = parts[1]
# NOTE(termie): object-store insists on having a dash
service = parts[2].replace('_', '-')
key = parts[3]
region_ref = o.get(region, {})
service_ref = region_ref.get(service, {})
service_ref[key] = v
region_ref[service] = service_ref
o[region] = region_ref
return o
# TODO(jaypipes): should be templated.Catalog,
# not templated.TemplatedCatalog to be consistent with
# other catalog backends
class TemplatedCatalog(kvs.Catalog):
"""A backend that generates endpoints for the Catalog based on templates.
It is usually configured via config entries that look like:
catalog.$REGION.$SERVICE.$key = $value
and is stored in a similar looking hierarchy. Where a value can contain
values to be interpolated by standard python string interpolation that look
like (the % is replaced by a $ due to paste attmepting to interpolate on
its own:
http://localhost:$(public_port)s/
When expanding the template it will pass in a dict made up of the conf
instance plus a few additional key-values, notably tenant_id and user_id.
It does not care what the keys and values are but it is worth noting that
keystone_compat will expect certain keys to be there so that it can munge
them into the output format keystone expects. These keys are:
name - the name of the service, most likely repeated for all services of
the same type, across regions.
adminURL - the url of the admin endpoint
publicURL - the url of the public endpoint
internalURL - the url of the internal endpoint
"""
def __init__(self, templates=None):
if templates:
self.templates = templates
else:
template_file = CONF.catalog.template_file
if not os.path.exists(template_file):
template_file = CONF.find_file(template_file)
self._load_templates(template_file)
super(TemplatedCatalog, self).__init__()
def _load_templates(self, template_file):
try:
self.templates = parse_templates(open(template_file))
except IOError:
LOG.critical(_('Unable to open template file %s') % template_file)
raise
def get_catalog(self, user_id, tenant_id, metadata=None):
d = dict(CONF.iteritems())
d.update({'tenant_id': tenant_id,
'user_id': user_id})
o = {}
for region, region_ref in self.templates.iteritems():
o[region] = {}
for service, service_ref in region_ref.iteritems():
o[region][service] = {}
for k, v in service_ref.iteritems():
o[region][service][k] = core.format_url(v, d)
return o
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