I have WSGI middleware that needs to capture the HTTP status (e.g. 200 OK
) that inner layers of middleware return by calling start_response
. Currently I'm doing the following, but abusing a list doesn't seem to be the “right” solution to me:
class TransactionalMiddlewareInterface(object): def __init__(self, application, **config): self.application = application self.config = config def __call__(self, environ, start_response): status = [] def local_start(stat_str, headers=[]): status.append(int(stat_str.split(' ')[0])) return start_response(stat_str, headers) try: result = self.application(environ, local_start) finally: status = status[0] if status else 0 if status > 199 and status
The reason for the list abuse is that I can not assign a new value to the parent namespace from within a wholly contained function.
You can assign the status as an injected field of local_start
function itself rather than using status
list. I used something similar, works fine:
class TransactionalMiddlewareInterface(object):
def __init__(self, application, **config):
self.application = application
self.config = config
def __call__(self, environ, start_response):
def local_start(stat_str, headers=[]):
local_start.status = int(stat_str.split(' ')[0])
return start_response(stat_str, headers)
try:
result = self.application(environ, local_start)
finally:
if local_start.status and local_start.status > 199:
pass
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