Hardware introspection daemon for OpenStack Ironic
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# 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.
"""Generic Rest Api tools."""
import functools
import flask
from oslo_config import cfg
from oslo_utils import uuidutils
from ironic_inspector.common.i18n import _
from ironic_inspector import utils
CONF = cfg.CONF
def raises_coercion_exceptions(fn):
"""Convert coercion function exceptions to utils.Error.
:raises: utils.Error when the coercion function raises an
AssertionError or a ValueError
"""
@functools.wraps(fn)
def inner(*args, **kwargs):
try:
ret = fn(*args, **kwargs)
except (AssertionError, ValueError) as exc:
raise utils.Error(_('Bad request: %s') % exc, code=400)
return ret
return inner
def request_field(field_name):
"""Decorate a function that coerces the specified field.
:param field_name: name of the field to fetch
:returns: a decorator
"""
def outer(fn):
@functools.wraps(fn)
def inner(*args, **kwargs):
default = kwargs.pop('default', None)
field = flask.request.args.get(field_name, default=default)
if field == default:
# field not found or the same as the default, just return
return default
return fn(field, *args, **kwargs)
return inner
return outer
@request_field('marker')
@raises_coercion_exceptions
def marker_field(value):
"""Fetch the pagination marker field from flask.request.args.
:returns: an uuid
"""
assert uuidutils.is_uuid_like(value), _('Marker not UUID-like')
return value
@request_field('limit')
@raises_coercion_exceptions
def limit_field(value):
"""Fetch the pagination limit field from flask.request.args.
:returns: the limit
"""
# limit of zero means the default limit
value = int(value) or CONF.api_max_limit
assert value >= 0, _('Limit cannot be negative')
assert value <= CONF.api_max_limit, _('Limit over %s') % CONF.api_max_limit
return value