nova/nova/tests/unit/api/openstack/test_faults.py

# Copyright 2013 IBM Corp.
# 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 mock
from oslo.serialization import jsonutils
import webob
import webob.dec
import webob.exc

import nova.api.openstack
from nova.api.openstack import wsgi
from nova import exception
from nova import test


class TestFaultWrapper(test.NoDBTestCase):
    """Tests covering `nova.api.openstack:FaultWrapper` class."""

    @mock.patch('oslo.i18n.translate')
    @mock.patch('nova.i18n.get_available_languages')
    def test_safe_exception_translated(self, mock_languages, mock_translate):
        def fake_translate(value, locale):
            return "I've been translated!"

        mock_translate.side_effect = fake_translate

        # Create an exception, passing a translatable message with a
        # known value we can test for later.
        safe_exception = exception.NotFound('Should be translated.')
        safe_exception.safe = True
        safe_exception.code = 404

        req = webob.Request.blank('/')

        def raiser(*args, **kwargs):
            raise safe_exception

        wrapper = nova.api.openstack.FaultWrapper(raiser)
        response = req.get_response(wrapper)

        # The text of the exception's message attribute (replaced
        # above with a non-default value) should be passed to
        # translate().
        mock_translate.assert_any_call(u'Should be translated.', None)
        # The return value from translate() should appear in the response.
        self.assertIn("I've been translated!", unicode(response.body))


class TestFaults(test.NoDBTestCase):
    """Tests covering `nova.api.openstack.faults:Fault` class."""

    def _prepare_xml(self, xml_string):
        """Remove characters from string which hinder XML equality testing."""
        xml_string = xml_string.replace("  ", "")
        xml_string = xml_string.replace("\n", "")
        xml_string = xml_string.replace("\t", "")
        return xml_string

    def test_400_fault_json(self):
        # Test fault serialized to JSON via file-extension and/or header.
        requests = [
            webob.Request.blank('/.json'),
            webob.Request.blank('/', headers={"Accept": "application/json"}),
        ]

        for request in requests:
            fault = wsgi.Fault(webob.exc.HTTPBadRequest(explanation='scram'))
            response = request.get_response(fault)

            expected = {
                "badRequest": {
                    "message": "scram",
                    "code": 400,
                },
            }
            actual = jsonutils.loads(response.body)

            self.assertEqual(response.content_type, "application/json")
            self.assertEqual(expected, actual)

    def test_413_fault_json(self):
        # Test fault serialized to JSON via file-extension and/or header.
        requests = [
            webob.Request.blank('/.json'),
            webob.Request.blank('/', headers={"Accept": "application/json"}),
        ]

        for request in requests:
            exc = webob.exc.HTTPRequestEntityTooLarge
            # NOTE(aloga): we intentionally pass an integer for the
            # 'Retry-After' header. It should be then converted to a str
            fault = wsgi.Fault(exc(explanation='sorry',
                        headers={'Retry-After': 4}))
            response = request.get_response(fault)

            expected = {
                "overLimit": {
                    "message": "sorry",
                    "code": 413,
                    "retryAfter": "4",
                },
            }
            actual = jsonutils.loads(response.body)

            self.assertEqual(response.content_type, "application/json")
            self.assertEqual(expected, actual)

    def test_429_fault_json(self):
        # Test fault serialized to JSON via file-extension and/or header.
        requests = [
            webob.Request.blank('/.json'),
            webob.Request.blank('/', headers={"Accept": "application/json"}),
        ]

        for request in requests:
            exc = webob.exc.HTTPTooManyRequests
            # NOTE(aloga): we intentionally pass an integer for the
            # 'Retry-After' header. It should be then converted to a str
            fault = wsgi.Fault(exc(explanation='sorry',
                        headers={'Retry-After': 4}))
            response = request.get_response(fault)

            expected = {
                "overLimit": {
                    "message": "sorry",
                    "code": 429,
                    "retryAfter": "4",
                },
            }
            actual = jsonutils.loads(response.body)

            self.assertEqual(response.content_type, "application/json")
            self.assertEqual(expected, actual)

    def test_fault_has_status_int(self):
        # Ensure the status_int is set correctly on faults.
        fault = wsgi.Fault(webob.exc.HTTPBadRequest(explanation='what?'))
        self.assertEqual(fault.status_int, 400)