python记录器多次记录相同的条目

发布于 2024-09-14 12:29:16 字数 707 浏览 4 评论 0原文

我有一个这样的记录器初始化函数:

def generate_logger():
    import logging
    LOG_FILENAME = os.path.join(PROJECT_DIR, "mylog.log")
    FORMAT = "%(asctime)s : %(message)s"
    logger = logging.getLogger()
    logger.setLevel(logging.INFO)
    fh = logging.FileHandler(LOG_FILENAME)
    formatter = logging.Formatter(FORMAT)
    fh.setFormatter(formatter)
    logger.addHandler(fh)
    return logger

在我的代码的某些部分,我有这样的异常捕获:

logger = generate_logger()
except AttributeError:
    logger.error('Opps we got an error')

奇怪的是,我将相同的错误写入两次,并且只能捕获一次,一旦我更改 logger.error('Opps we遇到错误') 使用 print "test",我打印了一次“test”。

问题是什么以及解决方案是什么?

I have a such logger initializing function:

def generate_logger():
    import logging
    LOG_FILENAME = os.path.join(PROJECT_DIR, "mylog.log")
    FORMAT = "%(asctime)s : %(message)s"
    logger = logging.getLogger()
    logger.setLevel(logging.INFO)
    fh = logging.FileHandler(LOG_FILENAME)
    formatter = logging.Formatter(FORMAT)
    fh.setFormatter(formatter)
    logger.addHandler(fh)
    return logger

And at some part of my code I have such exception catching:

logger = generate_logger()
except AttributeError:
    logger.error('Opps we got an error')

Weirdly I get same error written 2 times and it can be caugh only once, once I change logger.error('Opps we got an error') with print "test", I get "test" printed once.

What can be the problem and the solution?

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评论(5

独闯女儿国 2024-09-21 12:29:16

每次调用该函数时,都会向根记录器添加一个新的 FileHandler:不带名称参数的 logger.getLogger() 调用每次都会返回相同的记录器对象。

您应该仅调用 generate_logger() 一次,然后通过调用 logger.getLogger() 获取相同的记录器对象:(

generate_logger()

# .... some time later

log = logger.getLogger()
except AttributeError:
   log.error('Opps we got an error')

请注意,您不需要 generate_logger( ) 现在返回一个值)

You are adding a new FileHandler to the root logger every time you call that function: the call to logger.getLogger() without a name argument returns the same logger object every time.

You should call generate_logger() only once and then simply get the same logger object by calling logger.getLogger():

generate_logger()

# .... some time later

log = logger.getLogger()
except AttributeError:
   log.error('Opps we got an error')

(note that you do not need generate_logger() to return a value now)

烟燃烟灭 2024-09-21 12:29:16

我也遇到了同样的问题并遇到了这个页面。是的,我还创建了多个处理程序。在generate_logger()中,您可以检查是否有任何其他处理程序并将其删除。

def generate_logger():
    import logging
    LOG_FILENAME = os.path.join(PROJECT_DIR, "mylog.log")
    FORMAT = "%(asctime)s : %(message)s"
    logger = logging.getLogger()
    logger.setLevel(logging.INFO)
    # Reset the logger.handlers if it already exists.
    if logger.handlers:
        logger.handlers = []
    fh = logging.FileHandler(LOG_FILENAME)
    formatter = logging.Formatter(FORMAT)
    fh.setFormatter(formatter)
    logger.addHandler(fh)
    return logger

I also faced the same problem and came across this page. Yes, I was also creating multiple handlers. In generate_logger(), you can check if there's any other handlers and delete them.

def generate_logger():
    import logging
    LOG_FILENAME = os.path.join(PROJECT_DIR, "mylog.log")
    FORMAT = "%(asctime)s : %(message)s"
    logger = logging.getLogger()
    logger.setLevel(logging.INFO)
    # Reset the logger.handlers if it already exists.
    if logger.handlers:
        logger.handlers = []
    fh = logging.FileHandler(LOG_FILENAME)
    formatter = logging.Formatter(FORMAT)
    fh.setFormatter(formatter)
    logger.addHandler(fh)
    return logger
玩心态 2024-09-21 12:29:16

我认为您可能会以某种方式将两个处理程序添加到记录器中。也许在某个时候会添加隐式处理程序。

I think you're probably getting two handlers added to the logger somehow. Perhaps at some point an implicit handler is being added.

深爱成瘾 2024-09-21 12:29:16

您可能有两个处理程序处理相同的结果日志。

您要创建多少个处理程序?您执行了多少次generate_logger?每次执行generate_logger时,您都会为同一文件创建另一个处理程序,从而导致潜在的重复。

You probably have two handlers going to the same resulting log.

How many handlers are you creating? How many times are you executing generate_logger? Each time you execute generate_logger you'll create another handler to the same file, leading to potential duplication.

相思故 2024-09-21 12:29:16

为此可以使用单例设计模式:

43 class Singleton(type):
44“”“
45 定义一个实例操作,让客户端访问其唯一的
46 个实例。
47“”“
48
49 def init(cls, 名称, 基础, attrs, **kwargs):
50 super().init(名称、基础、属性)
51 cls._instance = 无
52
53 def 调用(cls, *args, **kwargs):
54 如果 cls._instance 为 None:
55 cls._instance = super().调用(*args, **kwargs)
56 返回 cls._instance
57
58
59
60 def _setup_logger(名称, log_file, level=logging.INFO):
61 """功能设置任意数量的记录器"""
62
63 handler =logging.FileHandler(log_file)
64 handler.setFormatter(格式化程序)
65 logger =logging.getLogger(名称)
66 logger.setLevel(级别)
67 logger.addHandler(处理程序)
68
69 返回记录器
70
71类Logger(metaclass=Singleton):
72
73 def init(self, file_name, level):
74 if not (isinstance(file_name, str) and
75 isinstance(level, int)):
76 引发 ValueError("无效参数")
77
78 self.log_inf = _setup_logger('inf', file_name+'.inf', level)
79 self.log_err = _setup_logger('err', file_name+'.err', level)

use can use singleton design pattern for this:

43 class Singleton(type):
44 """
45 Define an Instance operation that lets clients access its unique
46 instance.
47 """
48
49 def init(cls, name, bases, attrs, **kwargs):
50 super().init(name, bases, attrs)
51 cls._instance = None
52
53 def call(cls, *args, **kwargs):
54 if cls._instance is None:
55 cls._instance = super().call(*args, **kwargs)
56 return cls._instance
57
58
59
60 def _setup_logger(name, log_file, level=logging.INFO):
61 """Function setup as many loggers as you want"""
62
63 handler = logging.FileHandler(log_file)
64 handler.setFormatter(formatter)
65 logger = logging.getLogger(name)
66 logger.setLevel(level)
67 logger.addHandler(handler)
68
69 return logger
70
71 class Logger(metaclass=Singleton):
72
73 def init(self, file_name, level):
74 if not (isinstance(file_name, str) and
75 isinstance(level, int)):
76 raise ValueError("Invalid Args")
77
78 self.log_inf = _setup_logger('inf', file_name+'.inf', level)
79 self.log_err = _setup_logger('err', file_name+'.err', level)

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