text: # Copyright 2010 OpenStack Foundation
  # 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.
  
  import webob
  
  from nova.api.openstack.compute.views import flavors as flavors_view
  from nova.api.openstack import extensions
  from nova.api.openstack import wsgi
  from nova.compute import flavors
  from nova import exception
  from nova.openstack.common.gettextutils import _
  from nova.openstack.common import strutils
  from nova import utils
  
  
  class FlavorsController(wsgi.Controller):
      """Flavor controller for the OpenStack API."""
  
      _view_builder_class = flavors_view.V3ViewBuilder
  
      @extensions.expected_errors(400)
      def index(self, req):
          """Return all flavors in brief."""
          limited_flavors = self._get_flavors(req)
          return self._view_builder.index(req, limited_flavors)
  
      @extensions.expected_errors(400)
      def detail(self, req):
          """Return all flavors in detail."""
          limited_flavors = self._get_flavors(req)
          req.cache_db_flavors(limited_flavors)
          return self._view_builder.detail(req, limited_flavors)
  
      @extensions.expected_errors(404)
      def show(self, req, id):
          """Return data about the given flavor id."""
          context = req.environ['nova.context']
          try:
              flavor = flavors.get_flavor_by_flavor_id(id, ctxt=context)
              req.cache_db_flavor(flavor)
          except exception.FlavorNotFound as e:
              raise webob.exc.HTTPNotFound(explanation=e.format_message())
  
          return self._view_builder.show(req, flavor)
  
      def _parse_is_public(self, is_public):
          """Parse is_public into something usable."""
  
          if is_public is None:
              # preserve default value of showing only public flavors
              return True
          elif utils.is_none_string(is_public):
              return None
          else:
              try:
                  return strutils.bool_from_string(is_public, strict=True)
              except ValueError:
                  msg = _('Invalid is_public filter [%s]') % is_public
                  raise webob.exc.HTTPBadRequest(explanation=msg)
  
      def _get_flavors(self, req):
          """Helper function that returns a list of flavor dicts."""
          filters = {}
          sort_key = req.params.get('sort_key') or 'flavorid'
          sort_dir = req.params.get('sort_dir') or 'asc'
          limit = req.params.get('limit') or None
          marker = req.params.get('marker') or None
  
          context = req.environ['nova.context']
          if context.is_admin:
              # Only admin has query access to all flavor types
              filters['is_public'] = self._parse_is_public(
                      req.params.get('is_public', None))
          else:
              filters['is_public'] = True
              filters['disabled'] = False
  
          if 'min_ram' in req.params:
              try:
                  filters['min_memory_mb'] = int(req.params['min_ram'])
              except ValueError:
                  msg = _('Invalid min_ram filter [%s]') % req.params['min_ram']
                  raise webob.exc.HTTPBadRequest(explanation=msg)
  
          if 'min_disk' in req.params:
              try:
                  filters['min_root_gb'] = int(req.params['min_disk'])
              except ValueError:
                  msg = (_('Invalid min_disk filter [%s]') %
                         req.params['min_disk'])
                  raise webob.exc.HTTPBadRequest(explanation=msg)
  
          try:
              limited_flavors = flavors.get_all_flavors_sorted_list(context,
                  filters=filters, sort_key=sort_key, sort_dir=sort_dir,
                  limit=limit, marker=marker)
          except exception.MarkerNotFound:
              msg = _('marker [%s] not found') % marker
              raise webob.exc.HTTPBadRequest(explanation=msg)
  
          return limited_flavors
  
  
  class Flavors(extensions.V3APIExtensionBase):
      """Flavors Extension."""
      name = "Flavors"
      alias = "flavors"
      version = 1
  
      def get_resources(self):
          collection_actions = {'detail': 'GET'}
          member_actions = {'action': 'POST'}
  
          resources = [
              extensions.ResourceExtension('flavors',
                                           FlavorsController(),
                                           member_name='flavor',
                                           collection_actions=collection_actions,
                                           member_actions=member_actions)
              ]
          return resources
  
      def get_controller_extensions(self):
          return []
  