78 lines
2.5 KiB
Python
78 lines
2.5 KiB
Python
# Copyright 2012 OpenStack Foundation
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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 jinja2
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from trove.common import cfg
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from trove.common import exception
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from trove.openstack.common import log as logging
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CONF = cfg.CONF
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LOG = logging.getLogger(__name__)
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ENV = jinja2.Environment(loader=jinja2.ChoiceLoader([
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jinja2.FileSystemLoader(CONF.template_path),
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jinja2.PackageLoader("trove", "templates"),
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]))
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class SingleInstanceConfigTemplate(object):
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""" This class selects a single configuration file by database type for
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rendering on the guest """
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def __init__(self, datastore_manager, flavor_dict, instance_id):
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""" Constructor
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:param datastore_manager: The datastore manager.
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:type name: str.
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:param flavor_dict: dict containing flavor details for use in jinja.
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:type flavor_dict: dict.
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:param instance_id: trove instance id
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:type: instance_id: str
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"""
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self.flavor_dict = flavor_dict
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template_filename = "%s/config.template" % datastore_manager
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self.template = ENV.get_template(template_filename)
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self.instance_id = instance_id
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def render(self):
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""" Renders the jinja template
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:returns: str -- The rendered configuration file
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"""
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server_id = self._calculate_unique_id()
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self.config_contents = self.template.render(
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flavor=self.flavor_dict, server_id=server_id)
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return self.config_contents
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def _calculate_unique_id(self):
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"""
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Returns a positive unique id based off of the instance id
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:return: a positive integer
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"""
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return abs(hash(self.instance_id) % (2 ** 31))
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def load_heat_template(datastore_manager):
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template_filename = "%s/heat.template" % datastore_manager
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try:
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template_obj = ENV.get_template(template_filename)
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return template_obj
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except jinja2.TemplateNotFound:
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msg = "Missing heat template for %s" % datastore_manager
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LOG.error(msg)
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raise exception.TroveError(msg)
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