# Copyright (c) 2010-2011 OpenStack, LLC.
#
# 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 unittest

from webob import Request

from swift.common.middleware import catch_errors

class FakeApp(object):
    def __init__(self, error=False):
        self.error = error

    def __call__(self, env, start_response):
        if self.error:
            raise Exception('augh!')
        return "FAKE APP"

def start_response(*args):
    pass

class TestCatchErrors(unittest.TestCase):

    def test_catcherrors_passthrough(self):
        app = catch_errors.CatchErrorMiddleware(FakeApp(), {})
        req = Request.blank('/', environ={'REQUEST_METHOD': 'GET'})
        resp = app(req.environ, start_response)
        self.assertEquals(resp, 'FAKE APP')

    def test_catcherrors(self):
        app = catch_errors.CatchErrorMiddleware(FakeApp(True), {})
        req = Request.blank('/', environ={'REQUEST_METHOD': 'GET'})
        resp = app(req.environ, start_response)
        self.assertEquals(resp, ['An error occurred'])

    def test_trans_id_header(self):

        def start_response(status, headers):
            self.assert_('x-trans-id' in (x[0] for x in headers))
        app = catch_errors.CatchErrorMiddleware(FakeApp(), {})
        req = Request.blank('/v1/a')
        app(req.environ, start_response)
        app = catch_errors.CatchErrorMiddleware(FakeApp(), {})
        req = Request.blank('/v1/a/c')
        app(req.environ, start_response)
        app = catch_errors.CatchErrorMiddleware(FakeApp(), {})
        req = Request.blank('/v1/a/c/o')
        app(req.environ, start_response)
        app = catch_errors.CatchErrorMiddleware(FakeApp(True), {})
        req = Request.blank('/v1/a')
        app(req.environ, start_response)
        app = catch_errors.CatchErrorMiddleware(FakeApp(True), {})
        req = Request.blank('/v1/a/c')
        app(req.environ, start_response)
        app = catch_errors.CatchErrorMiddleware(FakeApp(True), {})
        req = Request.blank('/v1/a/c/o')
        app(req.environ, start_response)

if __name__ == '__main__':
    unittest.main()