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OpenStack Study: vendordata_json.py**** CubicPower OpenStack Study ****
# Copyright 2013 Canonical Ltd # All Rights Reserved. # # 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. """Render Vendordata as stored in configured file.""" import errno from oslo.config import cfg from nova.api.metadata import base from nova.openstack.common.gettextutils import _ from nova.openstack.common import jsonutils from nova.openstack.common import log as logging file_opt = cfg.StrOpt('vendordata_jsonfile_path', help='File to load json formatted vendor data from') CONF = cfg.CONF CONF.register_opt(file_opt) LOG = logging.getLogger(__name__)
**** CubicPower OpenStack Study **** class JsonFileVendorData(base.VendorDataDriver):
**** CubicPower OpenStack Study **** def __init__(self, *args, **kwargs): super(JsonFileVendorData, self).__init__(*args, **kwargs) data = {} fpath = CONF.vendordata_jsonfile_path logprefix = "%s[%s]: " % (file_opt.name, fpath) if fpath: try: with open(fpath, "r") as fp: data = jsonutils.load(fp) except IOError as e: if e.errno == errno.ENOENT: LOG.warn(logprefix + _("file does not exist")) else: LOG.warn(logprefix + _("Unexpected IOError when reading")) raise e except ValueError: LOG.warn(logprefix + _("failed to load json")) raise self._data = data
**** CubicPower OpenStack Study **** def get(self): return self._data
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