Verbose Python JSON logging for local dev

dan_formatter.py

import json
import logging


def recursive_dict(obj, converted_objs=()):
    converted_objs = converted_objs or set()
    try:
        attrs = obj.__dict__
    except AttributeError:
        if isinstance(obj, dict):
            attrs = obj
        else:
            return obj

    converted_objs.add(id(obj))
    result = {}
    for k, v in attrs.items():
        if id(v) in converted_objs:
            result[str(k)] = '<recursive>'
        else:
            result[str(k)] = recursive_dict(v, converted_objs)
    return result


class DanFormatter(logging.Formatter):

    def format(self, record):
        record.message = record.getMessage()
        record.asctime = self.formatTime(record, self.datefmt)
        if record.exc_info:
            record.exc_text = self.formatException(record.exc_info)

        flat_objs = recursive_dict(record)
        return json.dumps(flat_objs, default=str)