129 lines
3.9 KiB
Python
129 lines
3.9 KiB
Python
# Copyright 2014 DreamHost, LLC
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#
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# Author: DreamHost, LLC
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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 json
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import logging
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from astara_router.defaults import internal_metadata_port
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from astara_router.drivers import base
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from astara_router.utils import execute, replace_file
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LOG = logging.getLogger(__name__)
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CONF_PATH = '/etc/metadata.conf'
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class MetadataManager(base.Manager):
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"""
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A class to provide facilities to interact with the Nova metadata service.
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"""
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def __init__(self, root_helper='sudo'):
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"""
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Initializes MetataManager class.
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:type root_helper: str
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:param root_helper: System utility used to gain escalate privileges.
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"""
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super(MetadataManager, self).__init__(root_helper)
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def networks_have_changed(self, config):
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"""
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This function determines if the networks have changed since <config>
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was initialized.
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:type config: astara_router.models.Configuration
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:param config: An astara_router.models.Configuration object containing
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the current configuration of the system's networks.
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:rtype: bool
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"""
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net_ids = set(
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[net.id for net in config.networks if net.is_tenant_network]
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)
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try:
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config_dict = json.load(open(CONF_PATH))
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except:
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# If we can't read the file, assume networks were added/removed
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return True
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config_dict.pop('tenant_id')
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return net_ids != set(config_dict.keys())
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def save_config(self, config):
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"""
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Writes <config> to the metadata configuration file (<CONF_PATH>).
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:type config: astara_router.models.Configuration
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:param config: An astara_router.models.Configuration object containing
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the configuration of metadata service.
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"""
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config_data = build_config(config)
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replace_file(
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'/tmp/metadata.conf',
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json.dumps(config_data, sort_keys=True)
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)
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execute(['mv', '/tmp/metadata.conf', CONF_PATH], self.root_helper)
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def ensure_started(self):
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"""
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Checks if the metadata service is started and starts it if it is
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determined to be stopped.
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"""
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try:
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execute(['/etc/init.d/metadata', 'status'], self.root_helper)
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except:
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execute(['/etc/init.d/metadata', 'start'], self.root_helper)
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def restart(self):
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"""
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Restarts the metadata service using the init script.
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"""
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try:
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execute(['/etc/init.d/metadata', 'stop'], self.root_helper)
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except:
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# failure is ok here
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pass
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execute(['/etc/init.d/metadata', 'start'], self.root_helper)
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def build_config(config):
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"""
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Determines the configuration of the metadata service.
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:type config: astara_router.models.Configuration
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:param config:
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:rtype: astara_router.models.Configuration
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"""
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config_data = {}
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for net in config.networks:
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if not net.is_tenant_network:
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continue
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ip_instance_map = {}
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for a in net.address_allocations:
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for ip in a.ip_addresses:
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ip_instance_map[ip] = a.device_id
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config_data[net.id] = {
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'listen_port': internal_metadata_port(net.interface.ifname),
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'ip_instance_map': ip_instance_map
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}
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config_data['tenant_id'] = config.tenant_id
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return config_data
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