Falcon logging middleware

falcon-logging-middleware.py

import falcon
import logging

logger = logging.getLogger(__name__)
logger.addHandler(logging.FileHandler('test.log'))
logger.setLevel(logging.INFO)

class ResponseLoggerMiddleware(object):
    def process_response(self, req, resp):
        logger.info('{0} {1} {2}'.format(req.method, req.relative_uri, resp.status[:3]))

class TestResource(object):
    def on_post(self, req, resp):
        if req.content_type != 'application/json':
            raise falcon.HTTPUnsupportedMediaType('JSON please!')
        else:
            resp.status = falcon.HTTP_201

application = falcon.API(middleware=[ResponseLoggerMiddleware()])
application.add_route('/test', TestResource())

status-code-logged-incorrectly

$ http POST localhost:8000/test foo=bar Content-Type:application/json
HTTP/1.1 201 Created
$ http POST localhost:8000/test foo=bar Content-Type:application/xml
HTTP/1.1 415 Unsupported Media Type

# test.log
POST /test 201
POST /test 200

With current falcon, it seems the signature for process_response has to be

def process_response(self, req, resp, resource, req_succeeded):

i was trying to add a logger in the process_request method of interceptor. But logger.info() is not writing to the configured log file, but there are no exceptions or errors. Not just that, logger is working perfectly in the rest of the code. Is there any reason or explanation for this? Thanks Ranjith~

Thanks for sharing 🙏

FYI ⬇️ is better to avoid logging-not-lazy.

logger.info('%s %s %s', req.method, req.relative_uri, resp.status[:3])