Custom Python logging method

Question

I'd like to use python-logstash in my Django application and need to pass 'extra' fields. Here are the docs .

extra = {"app":"app-live","source":"django_log"}

I would prefer not to go through and change all of my logger calls, for example:

logger.info('Information blah.') to logger.info('Information blah.', extra=extra)

The extra will be the same for every single call and is required. I would prefer to override the existing logger methods so that I can just do this once.

Is there a way to do this in the logging handlers in the Django settings.py or how and where can I override the logger methods to always add the extra args?

Answer 1

You should be able to do that globally with a Filter as described in the logging cookbook .

To simplify things a bit, Django provides a CallbackFilter . Your filter function would look like this:

def logstash_filter(record):
    record.app = 'app-live'
    record.source = 'django_log'
    return True

And your logging config something like this.

...
'filters': {
    'add_logstash_info': {
        '()': 'django.utils.log.CallbackFilter',
        'callback': logstash_filter,
    }
},
'handlers': {
    'logstash': {
        ...
        'filters': ['add_logstash_info'],
    },
...