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ignoring some default fields from SimpleJsonFormatter


shradhattx at gmail.com wrote:

> I am using for my logger
> 
> handler.setFormatter(SimpleJsonFormatter(json.dumps))

Where does SimpleJsonFormatter come from?

If it uses the json.dumps argument to serialize a dict you may pass a 
modified version instead:

# untested
KEYS_TO_IGNORE = {"fields", "you", "do", "not", "want"}

def my_pruning_dumps(d):
    for k in KEYS_TO_IGNORE:
        try:
            del d[k]
        except KeyError:
            pass
    return json.dumps(d)

handler.setFormatter(SimpleJsonFormatter(my_pruning_dumps))

> It had some default fields - timestamp, function, line_number, module,
> level
> 
> and flexibility to provide extra fields in json log with use of
> 
>    logger.info("my test message", extra={"anotherfield1": "test"})
> 
> I am using decorator functions so some of the default fields provided ex-
> function, line_number, module are not useful as it gives information on
> decorator module, line_number. I like to remove some fields from being
> logged while retaining others, keeping also the use of "extra"
> 
> This is what I tried -
>      logging.Formatter('{"timestamp": "%(asctime)s.%(msecs)06d",
>      "level":"%(levelname)s"}',
>                         '%Y-%m-%dT%H:%M:%S')
> 
> The problem is that it doesn't print the fields given in 'extra'
> 
> 
> How do I accomplish this?