Problem

Python Flask Logging Log Reports An error "Another program is using this file, the process cannot be accessed"

2. Code example

#!/usr/bin/env python
# -*- coding: utf-8 -*-
# @Author:   craftsman

import os
import datetime
import decimal
import logging
from logging.handlers import TimedRotatingFileHandler
import redis
import json
from flask import Flask, request, make_response, current_app, g
from flask import render_template
from flask import jsonify
from flask import send_from_directory
from flask_sqlalchemy import SQLAlchemy
import flask.json
from config import sql_db_config

BASE_DIR = os.path.dirname(os.path.abspath(__file__))
LOG_PATH = os.path.join(BASE_DIR, 'logs')
app = Flask(__name__)
# Configure log information
# Set the log level of the log
logging.basicConfig(level=logging.INFO)
# Create a logging device, specify the path saved by the log, the maximum size of each log file, saved the number of log files
file_log_handler = TimedRotatingFileHandler(filename=os.path.join(LOG_PATH, 'info.log'),
                                            when='midnight', backupCount=31, interval=1, encoding='utf-8')
# Create a logging format log level Enter the file name row log information for log information
formatter = logging.Formatter('[%(levelname)s %(filename)s:%(lineno)d]: %(message)s')
# Set the logging format for the log recorder you just created
file_log_handler.setFormatter(formatter)
# Add a day recorder for the global log tool object (used by Flask App)
logging.getLogger().addHandler(file_log_handler)
app.logger.addHandler(file_log_handler)

3. Reason

When using RotatingFileHandler or TimerotatingFileHandler in Flask, this is the case when the log file is backed up, and it is written to the same log file, and write a conflict.

4. Solve

pip install concurrent-log-handler
After installation, the code above will not report any more, and the log will automatically back up.

appendix:
For details, please refer to: https://github.com/preston-landers/concurrent-log-handler

Plunder
Point of attention
Thank you

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