英文:
File rotation and deletion on json files
问题
如何在 JSON 文件上实现文件轮换？我知道Python的日志模块中存在一个文件轮换处理程序，但那是用于轮换和删除日志文件的。
我的程序正在使用JSON模块进行读写，尽管我也可以使用日志模块以JSON格式写入文件，但我认为这不是一个好的做法。
是否有其他库可以使用，还是我需要编写自己的脚本来进行轮换和删除操作？
英文:
How can I implement fileRotation on json files. I know there exists a fileRotation handler in logging module of python but that is used to rotate and delete log files.
My program is reading and writing using json module, although I can also use logging module to write in json form into the files but I don't think that is a good practice.
Is there any other library I can use or will I have to write my own script to do rotation and deletion?
答案1
得分: 2
你可以使用logging和json模块来实现这个，如下所示：
import logging
import json
import os
from logging.handlers import RotatingFileHandler
def rotate_json_file(file_path, max_bytes, backup_count):
logger = logging.getLogger(__name__)
logger.setLevel(logging.INFO)
file_handler = RotatingFileHandler(file_path, mode='a', maxBytes=max_bytes, backupCount=backup_count)
file_handler.setFormatter(logging.Formatter('%(message)s'))
logger.addHandler(file_handler)
json_data = {'key': 'value'}
logger.info(json.dumps(json_data))
logger.removeHandler(file_handler)
file_handler.close()
record = logging.makeLogRecord(json_data)
if file_handler.shouldRollover(record):
# 获取旋转后的文件名
rotated_files = [file_path] + [file_path + '.{}'.format(i) for i in range(1, backup_count + 1)]
os.remove(rotated_files[-1])
for i in range(len(rotated_files) - 1, 0, -1):
os.rename(rotated_files[i - 1], rotated_files[i])
open(file_path, 'a').close()
如果你想要基于时间进行旋转：
```python
import logging
import json
import os
from logging.handlers import TimedRotatingFileHandler
def rotate_json_file(file_path, when, interval, backup_count):
logger = logging.getLogger(__name__)
logger.setLevel(logging.INFO)
file_handler = TimedRotatingFileHandler(file_path, when=when, interval=interval, backupCount=backup_count)
file_handler.setFormatter(logging.Formatter('%(message)s'))
logger.addHandler(file_handler)
json_data = {'key': 'value'}
logger.info(json.dumps(json_data))
logger.removeHandler(file_handler)
file_handler.close()
record = logging.makeLogRecord(json_data)
if file_handler.shouldRollover(record):
# 获取旋转后的文件名
rotated_files = [file_handler.baseFilename] + file_handler.getFilesToDelete()
os.remove(rotated_files[-1])
for i in range(len(rotated_files) - 1, 0, -1):
os.rename(rotated_files[i - 1], rotated_files[i])
open(file_handler.baseFilename, 'a').close()
在这里我们使用了"TimedRotatingFileHandler"。
英文:
You can use the logging and json modules to achieve this as follows:
import logging
import json
import os
from logging.handlers import RotatingFileHandler
def rotate_json_file(file_path, max_bytes, backup_count):
logger = logging.getLogger(__name__)
logger.setLevel(logging.INFO)
file_handler = RotatingFileHandler(file_path, mode='a', maxBytes=max_bytes, backupCount=backup_count)
file_handler.setFormatter(logging.Formatter('%(message)s'))
logger.addHandler(file_handler)
json_data = {'key': 'value'}
logger.info(json.dumps(json_data))
logger.removeHandler(file_handler)
file_handler.close()
record = logging.makeLogRecord(json_data)
if file_handler.shouldRollover(record):
# Get the rotated file names
rotated_files = [file_path] + [file_path + '.{}'.format(i) for i in range(1, backup_count + 1)]
os.remove(rotated_files[-1])
for i in range(len(rotated_files) - 1, 0, -1):
os.rename(rotated_files[i - 1], rotated_files[i])
open(file_path, 'a').close()
If you would like it to be Time based:
import logging
import json
import os
from logging.handlers import TimedRotatingFileHandler
def rotate_json_file(file_path, when, interval, backup_count):
logger = logging.getLogger(__name__)
logger.setLevel(logging.INFO)
file_handler = TimedRotatingFileHandler(file_path, when=when, interval=interval, backupCount=backup_count)
file_handler.setFormatter(logging.Formatter('%(message)s'))
logger.addHandler(file_handler)
json_data = {'key': 'value'}
logger.info(json.dumps(json_data))
logger.removeHandler(file_handler)
file_handler.close()
record = logging.makeLogRecord(json_data)
if file_handler.shouldRollover(record):
# Get the rotated file names
rotated_files = [file_handler.baseFilename] + file_handler.getFilesToDelete()
os.remove(rotated_files[-1])
for i in range(len(rotated_files) - 1, 0, -1):
os.rename(rotated_files[i - 1], rotated_files[i])
open(file_handler.baseFilename, 'a').close()
Where we use the "TimedRotatingFileHandler" instead.
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