125 lines
4.0 KiB
Python
125 lines
4.0 KiB
Python
# Copyright 2012 OpenStack Foundationc
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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 os.path
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import six
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from keystone.catalog.backends import kvs
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from keystone.catalog import core
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from keystone import config
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from keystone import exception
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from keystone.i18n import _LC
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from keystone.openstack.common import log
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LOG = log.getLogger(__name__)
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CONF = config.CONF
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def parse_templates(template_lines):
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o = {}
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for line in template_lines:
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if ' = ' not in line:
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continue
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k, v = line.strip().split(' = ')
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if not k.startswith('catalog.'):
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continue
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parts = k.split('.')
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region = parts[1]
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# NOTE(termie): object-store insists on having a dash
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service = parts[2].replace('_', '-')
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key = parts[3]
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region_ref = o.get(region, {})
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service_ref = region_ref.get(service, {})
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service_ref[key] = v
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region_ref[service] = service_ref
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o[region] = region_ref
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return o
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class Catalog(kvs.Catalog):
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"""A backend that generates endpoints for the Catalog based on templates.
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It is usually configured via config entries that look like:
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catalog.$REGION.$SERVICE.$key = $value
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and is stored in a similar looking hierarchy. Where a value can contain
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values to be interpolated by standard python string interpolation that look
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like (the % is replaced by a $ due to paste attempting to interpolate on
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its own:
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http://localhost:$(public_port)s/
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When expanding the template it will pass in a dict made up of the conf
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instance plus a few additional key-values, notably tenant_id and user_id.
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It does not care what the keys and values are but it is worth noting that
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keystone_compat will expect certain keys to be there so that it can munge
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them into the output format keystone expects. These keys are:
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name - the name of the service, most likely repeated for all services of
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the same type, across regions.
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adminURL - the url of the admin endpoint
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publicURL - the url of the public endpoint
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internalURL - the url of the internal endpoint
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"""
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def __init__(self, templates=None):
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super(Catalog, self).__init__()
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if templates:
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self.templates = templates
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else:
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template_file = CONF.catalog.template_file
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if not os.path.exists(template_file):
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template_file = CONF.find_file(template_file)
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self._load_templates(template_file)
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def _load_templates(self, template_file):
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try:
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self.templates = parse_templates(open(template_file))
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except IOError:
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LOG.critical(_LC('Unable to open template file %s'), template_file)
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raise
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def get_catalog(self, user_id, tenant_id, metadata=None):
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substitutions = dict(six.iteritems(CONF))
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substitutions.update({'tenant_id': tenant_id, 'user_id': user_id})
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catalog = {}
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for region, region_ref in six.iteritems(self.templates):
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catalog[region] = {}
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for service, service_ref in six.iteritems(region_ref):
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service_data = {}
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try:
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for k, v in six.iteritems(service_ref):
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service_data[k] = core.format_url(v, substitutions)
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except exception.MalformedEndpoint:
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continue # this failure is already logged in format_url()
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catalog[region][service] = service_data
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return catalog
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