121 lines
3.8 KiB
Python
121 lines
3.8 KiB
Python
# Copyright 2013 Mirantis Inc.
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# Copyright 2014 Cloudbase Solutions Srl
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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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from oslo_config import cfg
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from oslo_log import log as oslo_logging
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import yaml
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from cloudbaseinit.plugins.common import execcmd
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from cloudbaseinit.plugins.common.userdataplugins import base
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from cloudbaseinit.plugins.common.userdataplugins.cloudconfigplugins import (
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factory
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)
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LOG = oslo_logging.getLogger(__name__)
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OPTS = [
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cfg.ListOpt(
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'cloud_config_plugins',
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default=[],
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help=(
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'List which contains the name of the cloud config plugins '
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'ordered by priority.'
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),
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)
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]
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CONF = cfg.CONF
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CONF.register_opts(OPTS)
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DEFAULT_ORDER_VALUE = 999
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class CloudConfigError(Exception):
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pass
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class CloudConfigPluginExecutor(object):
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"""A simple executor class for processing cloud-config plugins.
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:kwarg plugins:
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Pairs of plugin names and the values corresponding to that plugin.
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"""
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def __init__(self, **plugins):
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def _lookup_priority(plugin):
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try:
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return CONF.cloud_config_plugins.index(plugin)
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except ValueError:
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# If the plugin was not specified in the order
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# list, then default to a sane and unreachable value.
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return DEFAULT_ORDER_VALUE
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self._expected_plugins = sorted(
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plugins.items(),
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key=lambda item: _lookup_priority(item[0]))
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@classmethod
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def from_yaml(cls, stream):
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"""Initialize an executor from an yaml stream."""
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loader = getattr(yaml, 'CLoader', yaml.Loader)
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try:
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content = yaml.load(stream, Loader=loader)
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except (TypeError, ValueError, AttributeError):
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msg = "Invalid yaml stream provided."
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LOG.error(msg)
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raise CloudConfigError(msg)
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return cls(**content)
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def execute(self):
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"""Call each plugin, in the order requested by the user."""
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reboot = execcmd.NO_REBOOT
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plugins = factory.load_plugins()
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for plugin_name, value in self._expected_plugins:
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method = plugins.get(plugin_name)
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if not method:
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LOG.error("Plugin %r is currently not supported", plugin_name)
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continue
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try:
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requires_reboot = method(value)
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if requires_reboot:
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reboot = execcmd.RET_END
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except Exception:
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LOG.exception("Processing plugin %s failed", plugin_name)
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return reboot
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class CloudConfigPlugin(base.BaseUserDataPlugin):
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def __init__(self):
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super(CloudConfigPlugin, self).__init__("text/cloud-config")
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def process_non_multipart(self, part):
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"""Process the given data, if it can be loaded through yaml.
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If any plugin requires a reboot, it will return a particular
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value, which will be processed on a higher level.
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"""
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try:
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executor = CloudConfigPluginExecutor.from_yaml(part)
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except CloudConfigError:
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LOG.error("Could not process the type %r", type(part))
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else:
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return executor.execute()
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def process(self, part):
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payload = part.get_payload()
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return self.process_non_multipart(payload)
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