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sahara/plugins/hdp/configprovider.py

 

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# Copyright (c) 2013 Hortonworks, Inc.

 

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#

 

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# Licensed under the Apache License, Version 2.0 (the "License");

 

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# you may not use this file except in compliance with the License.

 

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# You may obtain 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,

 

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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or

 

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# implied.

 

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# See the License for the specific language governing permissions and

 

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# limitations under the License.

 

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from sahara import exceptions

 

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from sahara.i18n import _

 

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from sahara.plugins import provisioning as p

 

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class ConfigurationProvider:

 

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    def __init__(self, config):

 

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        self.config = config

 

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        self.config_mapper = {}

 

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        self.config_items = []

 

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        self._initialize(config)

 

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    def get_config_items(self):

 

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        return self.config_items

 

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    def get_applicable_target(self, name):

 

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        return self.config_mapper.get(name)

 

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    def _get_target(self, apptarget):

 

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        if apptarget == 'TODO':

 

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            apptarget = 'general'

 

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        return apptarget

 

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    def _initialize(self, config):

 

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        for configuration in self.config['configurations']:

 

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            for service_property in configuration['properties']:

 

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                config = p.Config(service_property['name'],

 

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                                  self._get_target(

 

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                                      service_property['applicable_target']),

 

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                                  service_property['scope'],

 

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                                  config_type=service_property['config_type'],

 

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                                  default_value=service_property

 

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                                  ['default_value'],

 

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                                  is_optional=service_property[

 

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                                      'is_optional'],

 

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                                  description=service_property[

 

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                                      'description'])

 

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                setattr(config, 'tag', configuration['tag'].rsplit(".", 1)[0])

 

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                self.config_items.append(config)

 

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                # TODO(jspeidel): an assumption is made that property names

 

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                # are unique across configuration sections which is dangerous

 

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                property_name = service_property['name']

 

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                # if property already exists, throw an exception

 

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                if property_name in self.config_mapper:

 

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                    # internal error

 

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                    # ambari-config-resource contains duplicates

 

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                    raise exceptions.InvalidDataException(

 

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                        _('Internal Error. Duplicate property '

 

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                          'name detected: %s') % property_name)

 

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                self.config_mapper[service_property['name']] = (

 

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                    self._get_target(

 

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                        service_property['applicable_target']))

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