CODEWITHSUNDEEP
pythonflaskflask-restful
arcologies
arcologies

Reputation: 752

Flask restful - Exception handling traceback?

I am using Flask Restful to build an API. I have a number of model classes with methods that may raise custom exceptions (for example: AuthFailed exception on my User model class). I am using the custom error handling, documented here, to handle this (so that when auth fails, an appropriate response is sent). So far so good. However, I notice that when the exception is raised although the correct response JSON and status is sent back, I still get a traceback which is not ideal. Usually, if I handle an error (outside of flask) with a try-except block, the except can catch the error and handle it (preventing the traceback). So what is the correct approach here? Am I misunderstanding how to use the errors feature?

Upvotes: 3

Views: 1712

Answers (1)

mxscho
mxscho

Reputation: 2170

Unfortunately for you, it is handled this way "by design" of the Flask-RESTful APIs errors functionality. The exceptions which are thrown are logged and the corresponding response defined in the errors dict is returned.

However, you can change the level of log output by modifying the log level of Flask's logger like this:

app = Flask(__name__)
app.logger.setLevel(logging.CRITICAL)

I think you would actually have to set it to CRITICAL because these errors are still getting logged even on log level ERROR as far as I know.

Furthermore, both Flask and Flask-RESTful are open-source. That being said, after looking at the code I found the function of a Flask app that is responsible for adding the exception traceback to the log (Flask version 0.11.1). Of course you could just create your own App class (extending the original class of Flask) which overrides this method (or a caller of it) and does something else instead. However, you should be careful when updating your Flask version if you make use of undocumented stuff like this.

Upvotes: 1

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