详解Pythonlogging调用Logger.info方法的处理过程_logger.info资源-CSDN下载

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详解详解Python logging调用调用Logger.info方法的处理过程方法的处理过程

本次分析一下Logger.info的流程

1. Logger.info源码源码:

def info(self, msg, *args, **kwargs):

"""

Log 'msg % args' with severity 'INFO'.

To pass exception information, use the keyword argument exc_info with

a true value, e.g.

logger.info("Houston, we have a %s", "interesting problem", exc_info=1)

"""

if self.isEnabledFor(INFO):

self._log(INFO, msg, args, **kwargs)

注释中反应了可以通过 msg和不定参数args来进行日志的格式化。

真实的调用为：_log方法：

2. Logger._log方法方法:

def _log(self, level, msg, args, exc_info=None, extra=None, stack_info=False):

"""

Low-level logging routine which creates a LogRecord and then calls

all the handlers of this logger to handle the record.

"""

sinfo = None

if _srcfile:

#IronPython doesn't track Python frames, so findCaller raises an

#exception on some versions of IronPython. We trap it here so that

#IronPython can use logging.

try:

fn, lno, func, sinfo = self.findCaller(stack_info)

except ValueError: # pragma: no cover

fn, lno, func = "(unknown file)", 0, "(unknown function)"

else: # pragma: no cover

fn, lno, func = "(unknown file)", 0, "(unknown function)"

if exc_info:

if isinstance(exc_info, BaseException):

exc_info = (type(exc_info), exc_info, exc_info.__traceback__)

elif not isinstance(exc_info, tuple):

exc_info = sys.exc_info()

record = self.makeRecord(self.name, level, fn, lno, msg, args,

exc_info, func, extra, sinfo)

self.handle(record)

最后两行：

生成日志记录：

record = self.makeRecord(self.name, level, fn, lno, msg, args, exc_info, func, extra, sinfo)

处理日志记录

self.handle(record)

2 生成日志记录:

def makeRecord(self, name, level, fn, lno, msg, args, exc_info,

func=None, extra=None, sinfo=None):

"""

A factory method which can be overridden in subclasses to create

specialized LogRecords.

"""

rv = _logRecordFactory(name, level, fn, lno, msg, args, exc_info, func,

sinfo)

if extra is not None:

for key in extra:

if (key in ["message", "asctime"]) or (key in rv.__dict__):

raise KeyError("Attempt to overwrite %r in LogRecord" % key)

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