logging errors with flask

Question

I'm trying to log an error in a decorator function using app.logger.error(''), but it just doesn't work. In addition I cant debug this well and I can only see the response from the http client:

(I'm using nginx+uwsgi+flask)

HTTP/1.1 502 Bad Gateway

Server: nginx

Date: Sun, 12 Aug 2012 15:45:09 GMT

Content-Type: text/html

Content-Length: 14

Connection: keep-alive

Everything works great with out the line: app.logger.error('panic !!!')

def mydecorator():
    def decorator(f):
        def wrapped_function(*args, **kwargs):
            try:
                ip = Mytable.query.filter_by(ip=request.remote_addr).first()
            except:
                app.logger.error('panic !!!')
            else:
                dootherthing()

            resp = make_response(f(*args, **kwargs))
            h = resp.headers
            h['add-this-header'] = ":)"
            return resp
        return update_wrapper(wrapped_function, f)
    return decorator

It seems that it is out of context or something.

Alvarolm · Accepted Answer · 2012-08-25 01:06:13Z

9

in fact, the decorator wasnt able to detect the app instance out of context, i solve this using current_app:

1st. Import the method: from flask import current_app

2nd. append any app class to current_app: current_app.logger.error('panic !!!')

info @ http://flask.pocoo.org/docs/api/#flask.current_app

"Points to the application handling the request. This is useful for extensions that want to support multiple applications running side by side. This is powered by the application context and not by the request context, so you can change the value of this proxy by using the app_context() method."

edited Aug 25, 2012 at 1:06

answered Aug 16, 2012 at 13:19

Alvarolm

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Comments

Mark Hildreth · Accepted Answer · 2012-08-12 20:36:18Z

0

Is app defined anywhere in the script that you've posted?

Also, to help with debugging, when testing you should consider using the run() method with debug mode.

app.run(debug=True)

answered Aug 12, 2012 at 20:36

Mark Hildreth

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3 Comments

Alvarolm Over a year ago

i cant, the flask app uses environ vars from nginx and when i run it in debug mode it freezes

Mark Hildreth Over a year ago

@Alvarolm: Perhaps you should consider redesigning the application so that you can run the app using a script from the command line. This will allow you to run in debug mode for testing purposes. Otherwise, you will be spending a lot of time trying to debug code without a clear idea of what is wrong.

Mark Hildreth Over a year ago

@Alvarolm: I would recommend fixing the app.debug issue first, then moving on to your other issues. Having debug mode is going to help you.

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