python-3.x - flask 记录重复输出

Question

我想将 flask 日志格式更改为控制台，我试过了，

Provide extra information to Flask's app.logger

但它对我不起作用；它已经超过 3 年了，也许已经过时了？

我可以添加一个额外的控制台处理程序，它可以工作，但是我得到了重复的输出，一次来自 flask 默认控制台处理程序，一次来自我添加的处理程序。

来源，

import sys
import logging
from flask import Flask


def setup_logging(level=logging.INFO):

    # FIXME: logs are coming out "twice", once with the format from flask, and again from
    #        the format from consoleHandler.  app.logger level and the console handler
    #        level seem to be linked
    app.logger.setLevel(level)

    # Here we define our formatter
    FORMAT = "%(relativeCreated)6d %(threadName)15s %(filename)25s:%(lineno)4s - %(name)30s:%(funcName)20s() %(levelname)-5.5s : %(message)s"
    formatter = logging.Formatter(FORMAT)

    consoleHandler = logging.StreamHandler(stream=sys.stdout)
    consoleHandler.setFormatter(formatter)
    consoleHandler.setLevel(level)

    app.logger.addHandler(consoleHandler)

    # this did not work :(
    # https://stackoverflow.com/questions/27775026/provide-extra-information-to-flasks-app-logger


app = Flask(__name__)

@app.route('/')
def hello_world():
    app.logger.info("Foo Bar")
    return 'Hello, World!'


setup_logging()

app.run(host="0.0.0.0", port=6800, debug=False)

输出，

 * Serving Flask app "SO_log_01" (lazy loading)
 * Environment: production
   WARNING: Do not use the development server in a production environment.
   Use a production WSGI server instead.
 * Debug mode: off
 * Running on http://0.0.0.0:6800/ (Press CTRL+C to quit)
[2018-07-02 17:35:52,906] INFO in SO_log_01: Foo Bar
127.0.0.1 - - [02/Jul/2018 17:35:52] "GET / HTTP/1.1" 200 -
  5083        Thread-1              SO_log_01.py:  39 -                      flask.app:         hello_world() INFO  : Foo Bar
127.0.0.1 - - [02/Jul/2018 17:35:55] "GET /favicon.ico HTTP/1.1" 404 -

Answer 1

如果要替换记录器格式，则需要删除以前的记录器处理程序。

app.logger.handlers.clear()
app.logger.addHandler(consoleHandler)

https://code.luasoftware.com/tutorials/flask/change-flask-logging-output-format/