def __init__(self, urllist, wrappers=None, options={}):
self.urldispatcher = URLDispatcher(urllist)
self.options = options
if 'secret_key' not in options:
raise ConfigurationException("Error, a secret_key must be specified!")
self.middleware = self.__init_middlware(wrappers)
class WSGIHandler:
def __init__(self, urllist, wrappers=None, options={}):
self.urldispatcher = URLDispatcher(urllist)
self.options = options
if 'secret_key' not in options:
raise ConfigurationException("Error, a secret_key must be specified!")
self.middleware = self.__init_middlware(wrappers)
def __init_middlware(self, wrappers):
middleware = list()
for wrapper, wopts in wrappers:
options = self.options.copy()
options.update(wrappers.default_options)
options.update(wopts)
if isinstance(wrapper, str):
wrapper = import_entity(wrapper)
middleware.append(wrapper(options))
return middleware
def process_request(self, request):
called_middleware = list()
for middleware in self.middleware:
try:
response = middleware.request(request)
if isinstance(response, Response):
self.process_response(called_middleware, response)
return response
except NotImplemented:
pass
finally:
called_middleware.append(middleware)
return called_middleware
def process_response(self, called_middleware, response):
while len(called_middleware) > 0:
middleware = called_middleware.pop()
middleware.response(response)
def __call__(self, environ, response_callback):
# Turn the environment object into an actual request object.
environ['options'] = self.options
request = Request(environ)
try:
# Call request middleware. If the response is an
# Response object then return that, assume that
# a middleware objected and responded itself.
called_middleware = self.process_request(request)
if isinstance(called_middleware, Response):
return called_middleware
try:
response = self.urldispatcher.call(request.path_info[1:], request)
if not isinstance(response, Response):
raise Server500Exception(
"The view did not return a Response object!",
request.path_info
)
except Server403Exception, e:
if 'login_url' in self.options:
response = LinkResponse(request, self.options['login_url'],
query={'next': request.path_info})
else:
response = ServerErrorResponse(request, e)
except ServerException, e:
response = ServerErrorResponse(request, e)
# The drawback to this design is that when critical/unhandled
# exceptions ocurr the response middleware is not called.
self.process_response(called_middleware, response)