def ensure_response(request):
rv = yield from self._provider.local_dispatcher(request)
status_or_headers = headers = None
if isinstance(rv, tuple):
rv, status_or_headers, headers = rv + (None,) * (3 - len(rv))
if rv is None:
raise HTTPInternalServerError()
if isinstance(status_or_headers, (list, dict)):
headers, status_or_headers = status_or_headers, None
if not isinstance(rv, Response):
data = rv
rv = Response(headers=headers, status=status_or_headers or 200,
content_type='application/json')
rv.text = json_serializer(data)
headers = status_or_headers = None
if status_or_headers is not None:
if isinstance(status_or_headers, int):
rv.status = status_or_headers
if headers:
rv.headers.extend(headers)
return rv
