Setup logging configuration

logging.json

{
  "version": 1,
  "disable_existing_loggers": false,
  "formatters": {
    "default": {
      "format": "%(asctime)s - %(name)s - %(levelname)s: %(message)s"
    },
    "console": {
      "format": "%(name)-12s: %(message)s"
    }
  },
  "handlers": {
    "console": {
      "class": "logging.StreamHandler",
      "level": "INFO",
      "formatter": "console",
      "stream": "ext://sys.stdout"
    },
    "err": {
      "class": "logging.StreamHandler",
      "level": "INFO",
      "formatter": "console",
      "stream": "ext://sys.stderr"
    },
    "main": {
      "class": "logging.handlers.RotatingFileHandler",
      "level": "DEBUG",
      "formatter": "default",
      "filename": "/path/to/main.log",
      "maxBytes": 20971520,
      "backupCount": 6,
      "encoding": "utf8"
    }
  },
  "loggers": {
    "": {
      "handlers": ["main", "console"],
      "level": "DEBUG",
      "propagate": true
    }
  }
}

setup_logging.py

def setup_logging(default_path="logging.json", default_level=logging.INFO):
    """Setup logging configuration"""
    path = default_path
    if os.path.exists(path):
        with open(path, 'rt') as f:
            config = json.load(f)
        logging.config.dictConfig(config)
    else:
        logging.basicConfig(level=default_level)