Flask DEBUG 日志记录不适用于 dictConfig 根配置

Question

我似乎无法进行日志记录工作。以下不会向控制台打印任何内容。 我一直在深入研究官方文档、SO，甚至 Reddit...但似乎没有什么对我有用:/

from flask import Flask, request, jsonify
from logging.config import dictConfig
import urllib.request
import logging
import sys
import os

def create_app():
    
    # https://betterstack.com/community/guides/logging/how-to-start-logging-with-flask/
    dictConfig(
        {
            "version": 1,
            "formatters": {
                "default": {
                    "format": "[%(asctime)s] %(levelname)s in %(module)s: %(message)s",
                }
            },
            "handlers": {
                "console": {
                    "class": "logging.StreamHandler",
                    "stream": "ext://sys.stdout",
                    "formatter": "default",
                }
            },
            "root": {"level": "DEBUG", "handlers": ["console"]},
        }
    )
    app = Flask(__name__)

    LOGGER = logging.getLogger("root")

    @app.get('/whatever')
    def view_zuerivelo_publibike() -> Flask.response_class:
        LOGGER.info('HELLO!') // nothing gets logged here

        # fetch raw XML
        try:
            response = urllib.request.urlopen(some_uri).read()
        except Exception as e:
            return jsonify({ 'message': e }), 500

        LOGGER.info(response) // nothing gets logged here
        
        return jsonify(response), 200
    
    return app

if __name__ == '__main__':
    create_app().run(debug=True, use_reloader=False)

Answer 1

虽然您已经配置了根记录器，但 Flask 默认情况下使用自己的记录器。您可以显式设置 app.logger 以使用自定义记录器或配置根记录器和flask.app 记录器。

"loggers": {
            "flask.app": {"level": "DEBUG", "handlers": ["console"], "propagate": False},
        }

然后设置

LOGGER = logging.getLogger("flask.app") 

from flask import Flask, request, jsonify
from logging.config import dictConfig
import logging


def create_app():
    dictConfig(
        {
            "version": 1,
            "formatters": {
                "default": {
                    "format": "[%(asctime)s] %(levelname)s in %(module)s: %(message)s",
                }
            },
            "handlers": {
                "console": {
                    "class": "logging.StreamHandler",
                    "stream": "ext://sys.stdout",
                    "formatter": "default",
                }
            },
            "root": {"level": "DEBUG", "handlers": ["console"]},
            "loggers": {
                "flask.app": {
                    "level": "DEBUG",
                    "handlers": ["console"],
                    "propagate": False,
                },
            },
        }
    )

    app = Flask(__name__)
    LOGGER = logging.getLogger("flask.app")

    @app.get("/whatever")
    def view_zuerivelo_publibike():
        LOGGER.info("HELLO!")
        try:
            some_uri = "http://example.com/data.xml"
            response = "Hello, World!"
        except Exception as e:
            LOGGER.error(f"Error fetching URI: {e}")
            return jsonify({"message": str(e)}), 500

        LOGGER.info(response)
        return jsonify(response), 200

    return app


if __name__ == "__main__":
    create_app().run(debug=True, use_reloader=False)