async def __call__(self, environ, on_response):
request, response = None, None
try:
request = await self.create_request(environ)
response = await self.full_dispatch_request(request)
except Exception as ex:
try:
exception = await self.exception_handler.process_exception(
request, ex)
except IGNORE_EXCEPTIONS:
response = None
else:
if isinstance(exception, self.exception_class):
response = exception.get_response()
elif isinstance(exception, self.response_class):
response = exception
else:
response = None
if not on_response:
return response
if response:
await on_response(response)
elif not self.is_websocket:
message = "Caught handled exception, response object empty."
self.logger.error(message)
await on_response(
self.exception_handler.process_exception(
request, ServerError(message)).get_response())
async def make_response(self, response):
if isinstance(response, self.response_class):
pass
elif isinstance(response, self.exception_class):
return response.get_response()
else:
raise ServerError(
'The view function did not return a valid http response. The'
' function must returned a statement.')
return response
async def make_response(self, response):
if callable(response):
response = response()
if isinstance(response, self.response_class):
pass
elif isinstance(response, self.exception_class):
return response.get_response()
else:
raise ServerError("Response Object Type invalid!")
return response
async def full_dispatch_request(self, request):
try:
signals.request_started.send(self)
response = await self.preprocess_request(request)
if response is None:
response = await self.dispatch_request(request)
response = await self.finalize_request(request, response)
return await self.finalize_response(response)
except Exception as ex:
exception = await self.exception_handler.process_exception(
request, ex)
if issubclass(type(exception), BaseException):
raise exception
try:
return await self.make_response(exception)
except ServerError:
message = "Caught handled exception: %s." % str(exception)
self.logger.error(message)
raise ServerError(message)