vmware-nsx/neutron/api/api_common.py
Mark McClain ee3fe4e836 Rename Quantum to Neutron
This change renames everything to Neutron while providing backwards
compatible adjustments for Grizzly configuration files.

implements blueprint: remove-use-of-quantum

Change-Id: Ie7d07ba7c89857e13d4ddc8f0e9b68de020a3d19
2013-07-06 15:02:43 -04:00

330 lines
10 KiB
Python

# vim: tabstop=4 shiftwidth=4 softtabstop=4
# Copyright 2011 Citrix System.
# 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 urllib
from oslo.config import cfg
from webob import exc
from neutron.common import constants
from neutron.common import exceptions
from neutron.openstack.common import log as logging
LOG = logging.getLogger(__name__)
def get_filters(request, attr_info, skips=[]):
"""Extracts the filters from the request string.
Returns a dict of lists for the filters:
check=a&check=b&name=Bob&
becomes:
{'check': [u'a', u'b'], 'name': [u'Bob']}
"""
res = {}
for key, values in request.GET.dict_of_lists().iteritems():
if key in skips:
continue
values = [v for v in values if v]
key_attr_info = attr_info.get(key, {})
if 'convert_list_to' in key_attr_info:
values = key_attr_info['convert_list_to'](values)
elif 'convert_to' in key_attr_info:
convert_to = key_attr_info['convert_to']
values = [convert_to(v) for v in values]
if values:
res[key] = values
return res
def get_previous_link(request, items, id_key):
params = request.GET.copy()
params.pop('marker', None)
if items:
marker = items[0][id_key]
params['marker'] = marker
params['page_reverse'] = True
return "%s?%s" % (request.path_url, urllib.urlencode(params))
def get_next_link(request, items, id_key):
params = request.GET.copy()
params.pop('marker', None)
if items:
marker = items[-1][id_key]
params['marker'] = marker
params.pop('page_reverse', None)
return "%s?%s" % (request.path_url, urllib.urlencode(params))
def get_limit_and_marker(request):
"""Return marker, limit tuple from request.
:param request: `wsgi.Request` possibly containing 'marker' and 'limit'
GET variables. 'marker' is the id of the last element
the client has seen, and 'limit' is the maximum number
of items to return. If limit == 0, it means we needn't
pagination, then return None.
"""
max_limit = _get_pagination_max_limit()
limit = _get_limit_param(request, max_limit)
if max_limit > 0:
limit = min(max_limit, limit) or max_limit
if not limit:
return None, None
marker = request.GET.get('marker', None)
return limit, marker
def _get_pagination_max_limit():
max_limit = -1
if (cfg.CONF.pagination_max_limit.lower() !=
constants.PAGINATION_INFINITE):
try:
max_limit = int(cfg.CONF.pagination_max_limit)
if max_limit == 0:
raise ValueError()
except ValueError:
LOG.warn(_("Invalid value for pagination_max_limit: %s. It "
"should be an integer greater to 0"),
cfg.CONF.pagination_max_limit)
return max_limit
def _get_limit_param(request, max_limit):
"""Extract integer limit from request or fail."""
try:
limit = int(request.GET.get('limit', 0))
if limit >= 0:
return limit
except ValueError:
pass
msg = _("Limit must be an integer 0 or greater and not '%d'")
raise exceptions.BadRequest(resource='limit', msg=msg)
def list_args(request, arg):
"""Extracts the list of arg from request."""
return [v for v in request.GET.getall(arg) if v]
def get_sorts(request, attr_info):
"""Extract sort_key and sort_dir from request.
Return as: [(key1, value1), (key2, value2)]
"""
sort_keys = list_args(request, "sort_key")
sort_dirs = list_args(request, "sort_dir")
if len(sort_keys) != len(sort_dirs):
msg = _("The number of sort_keys and sort_dirs must be same")
raise exc.HTTPBadRequest(explanation=msg)
valid_dirs = [constants.SORT_DIRECTION_ASC, constants.SORT_DIRECTION_DESC]
absent_keys = [x for x in sort_keys if x not in attr_info]
if absent_keys:
msg = _("%s is invalid attribute for sort_keys") % absent_keys
raise exc.HTTPBadRequest(explanation=msg)
invalid_dirs = [x for x in sort_dirs if x not in valid_dirs]
if invalid_dirs:
msg = (_("%(invalid_dirs)s is invalid value for sort_dirs, "
"valid value is '%(asc)s' and '%(desc)s'") %
{'invalid_dirs': invalid_dirs,
'asc': constants.SORT_DIRECTION_ASC,
'desc': constants.SORT_DIRECTION_DESC})
raise exc.HTTPBadRequest(explanation=msg)
return zip(sort_keys,
[x == constants.SORT_DIRECTION_ASC for x in sort_dirs])
def get_page_reverse(request):
data = request.GET.get('page_reverse', 'False')
return data.lower() == "true"
def get_pagination_links(request, items, limit,
marker, page_reverse, key="id"):
key = key if key else 'id'
links = []
if not limit:
return links
if not (len(items) < limit and not page_reverse):
links.append({"rel": "next",
"href": get_next_link(request, items,
key)})
if not (len(items) < limit and page_reverse):
links.append({"rel": "previous",
"href": get_previous_link(request, items,
key)})
return links
class PaginationHelper(object):
def __init__(self, request, primary_key='id'):
self.request = request
self.primary_key = primary_key
def update_fields(self, original_fields, fields_to_add):
pass
def update_args(self, args):
pass
def paginate(self, items):
return items
def get_links(self, items):
return {}
class PaginationEmulatedHelper(PaginationHelper):
def __init__(self, request, primary_key='id'):
super(PaginationEmulatedHelper, self).__init__(request, primary_key)
self.limit, self.marker = get_limit_and_marker(request)
self.page_reverse = get_page_reverse(request)
def update_fields(self, original_fields, fields_to_add):
if not original_fields:
return
if self.primary_key not in original_fields:
original_fields.append(self.primary_key)
fields_to_add.append(self.primary_key)
def paginate(self, items):
if not self.limit:
return items
i = -1
if self.marker:
for item in items:
i = i + 1
if item[self.primary_key] == self.marker:
break
if self.page_reverse:
return items[i - self.limit:i]
return items[i + 1:i + self.limit + 1]
def get_links(self, items):
return get_pagination_links(
self.request, items, self.limit, self.marker,
self.page_reverse, self.primary_key)
class PaginationNativeHelper(PaginationEmulatedHelper):
def update_args(self, args):
if self.primary_key not in dict(args.get('sorts', [])).keys():
args.setdefault('sorts', []).append((self.primary_key, True))
args.update({'limit': self.limit, 'marker': self.marker,
'page_reverse': self.page_reverse})
def paginate(self, items):
return items
class NoPaginationHelper(PaginationHelper):
pass
class SortingHelper(object):
def __init__(self, request, attr_info):
pass
def update_args(self, args):
pass
def update_fields(self, original_fields, fields_to_add):
pass
def sort(self, items):
return items
class SortingEmulatedHelper(SortingHelper):
def __init__(self, request, attr_info):
super(SortingEmulatedHelper, self).__init__(request, attr_info)
self.sort_dict = get_sorts(request, attr_info)
def update_fields(self, original_fields, fields_to_add):
if not original_fields:
return
for key in dict(self.sort_dict).keys():
if key not in original_fields:
original_fields.append(key)
fields_to_add.append(key)
def sort(self, items):
def cmp_func(obj1, obj2):
for key, direction in self.sort_dict:
ret = cmp(obj1[key], obj2[key])
if ret:
return ret * (1 if direction else -1)
return 0
return sorted(items, cmp=cmp_func)
class SortingNativeHelper(SortingHelper):
def __init__(self, request, attr_info):
self.sort_dict = get_sorts(request, attr_info)
def update_args(self, args):
args['sorts'] = self.sort_dict
class NoSortingHelper(SortingHelper):
pass
class NeutronController(object):
"""Base controller class for Neutron API."""
# _resource_name will be redefined in sub concrete controller
_resource_name = None
def __init__(self, plugin):
self._plugin = plugin
super(NeutronController, self).__init__()
def _prepare_request_body(self, body, params):
"""Verifies required parameters are in request body.
Sets default value for missing optional parameters.
Body argument must be the deserialized body.
"""
try:
if body is None:
# Initialize empty resource for setting default value
body = {self._resource_name: {}}
data = body[self._resource_name]
except KeyError:
# raise if _resource_name is not in req body.
raise exc.HTTPBadRequest(_("Unable to find '%s' in request body") %
self._resource_name)
for param in params:
param_name = param['param-name']
param_value = data.get(param_name)
# If the parameter wasn't found and it was required, return 400
if param_value is None and param['required']:
msg = (_("Failed to parse request. "
"Parameter '%s' not specified") % param_name)
LOG.error(msg)
raise exc.HTTPBadRequest(msg)
data[param_name] = param_value or param.get('default-value')
return body