Configuration

{
   "version": 1,
   "filters": {
      "defaultsetter": {
         "()": "jsonscribe.AttributeSetter",
         "add_fields": {
            "correlation_id": "ext://UUID"
         }
      }
   },
   "formatters": {
      "jsonlines": {
         "()": "jsonscribe.JSONFormatter",
         "include_fields": [
            "name",
            "levelname",
            "asctime",
            "message",
            "module",
            "correlation_id",
            "exc_info"
         ],
      }
   },
   "handlers": {
      "loggly": {
         "class": "logging.StreamHandler",
         "formatter": "jsonlines",
         "filters": ["defaultsetter"],
         "stream": "ext://sys.stdout"
      }
   },
   "loggers": {
      "somepackage": {
         "level": "DEBUG",
      }
   },
   "root": {
      "level": "INFO",
      "handlers": ["jsonlines"]
   }
}

Logging

The following snippet is the simplest usage. It is nothing more than the textbook usage of the logging module. It uses the logging configuration from above and generates a JSON blob.

import logging.config
import json

if __name__ == '__main__':
   config = json.load(open('config.json'))
   logging.config.dictConfig(config)
   logger = logging.getLogger(__package__).getChild('main')
   logger.info('processing request')

The JSON message looks something like the following. It is reformatted to make it readable. The default is to render it as compact JSON.

{
   "name": "somepackage.main",
   "levelname": "INFO",
   "asctime": "2018-08-09T07:44:54.231",
   "module": "somepackage.entrypoints",
   "correlation_id": "33CA3FB3-D66F-4D32-83A5-D5A8C3D92A6E",
   "message": "processing request",
   "exc_info": null
}