| #!/usr/bin/env python |
| # |
| # Copyright 2007 Google 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. |
| # |
| """Implementations of start_response callables as defined in PEP-333.""" |
| |
| |
| |
| import cStringIO |
| |
| |
| class CapturingStartResponse(object): |
| """Capture the values passed to start_response.""" |
| |
| def __init__(self): |
| self.status = None |
| self.response_headers = None |
| self.exc_info = None |
| self.response_stream = cStringIO.StringIO() |
| |
| def __call__(self, status, response_headers, exc_info=None): |
| assert exc_info is not None or self.status is None, ( |
| 'only one call to start_response allowed') |
| self.status = status |
| self.response_headers = response_headers |
| self.exc_info = exc_info |
| return self.response_stream |
| |
| def merged_response(self, response): |
| """Merge the response stream and the values returned by the WSGI app.""" |
| return self.response_stream.getvalue() + ''.join(response) |
| |
| |
| def null_start_response(status, response_headers, exc_info=None): |
| return cStringIO.StringIO() |
