Question

请考虑以下示例：

import logging
#create a logger object:
logger = logging.getLogger("MyLogger")
#define a logging handler for the standard output:
stdoutHandler = logging.StreamHandler(sys.stdout)
logger.addHandler(stdoutHandler)
#...
#initialization code with several logging events (for example, loading a configuration file to a 'conf' object)
#...
logger.info("Log event 1")
#after configuration is loaded, a new logging handler is defined for a log file:
fileHandler = logging.FileHandler(conf.get("main","log_file"),'w')
logger.addHandler(fileHandler)
logger.info("Log event 2")

使用此示例，“日志事件1”不会出现在日志文件中（仅在stdout中）。在“Log event 1”之后，日志文件不可避免地被初始化（因为它取决于配置）。

我的问题是：
如何在新的日志处理程序（例如示例中的文件处理程序）中包含以前记录的事件（例如“日志事件1”）？

Answer 1

我对这个问题的解决方案：

定义MemoryHandler以处理FileHandler定义之前的所有事件定义FileHandler后，将其设置为MemoryHandler的刷新目标并刷新它。

import logging
import logging.handlers
#create a logger object:
logger = logging.getLogger("MyLogger")
#define a memory handler:
memHandler = logging.handlers.MemoryHandler(capacity = 1024*10)
logger.addHandler(memHandler)
#...
#initialization code with several logging events (for example, loading a configuration file to a 'conf' object)
#everything is logged by the memory handler
#...

#after configuration is loaded, a new logging handler is defined for a log file:
fileHandler = logging.FileHandler(conf.get("main","log_file"),'w')
#flush the memory handler into the new file handler:
memHandler.setTarget(fileHandler)
memHandler.flush()
memHandler.close()
logger.removeHandler(memHandler)
logger.addHandler(fileHandler)

这对我有用，所以我接受这是正确的答案，直到出现更优雅的答案。

在新的日志记录处理程序中包含以前记录的事件

1 个答案: