# Copyright (c) 2011-2016 Rackspace US, Inc.
#
# 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.


from lunr.common import logger


def filter_factory(global_conf, **local_conf):

    def except_filter(app):
        def catch_error(env, start_response):
            try:
                return app(env, start_response)
            except Exception, err:
                logger.exception('Unhandled error in WSGI app: %s', err)
                start_response('500 Internal Server Error',
                               [('content-type', 'text/html')])
                return ['An error occurred handling your request.']
        return catch_error

    return except_filter
