Python logging.lastResort方法代碼示例

# 需要導入模塊: import logging [as 別名]
# 或者: from logging import lastResort [as 別名]
def callHandlers(self, record):
		# this is the same as Python 3.5's logging.Logger.callHandlers
		c = self
		found = 0
		while c:
			for hdlr in c.handlers:
				found = found + 1
				if record.levelno >= hdlr.level:
					hdlr.handle(record)
			if not c.propagate:
				c = None  # break out
			else:
				c = c.parent
		if (found == 0):
			if logging.lastResort:
				if record.levelno >= logging.lastResort.level:
					logging.lastResort.handle(record)
			elif logging.raiseExceptions and not self.manager.emittedNoHandlerWarning:
				sys.stderr.write("No handlers could be found for logger"
								 " \"%s\"\n" % self.name)
				self.manager.emittedNoHandlerWarning = True 

# 需要導入模塊: import logging [as 別名]
# 或者: from logging import lastResort [as 別名]
def test_last_resort(self):
        # Test the last resort handler
        root = self.root_logger
        root.removeHandler(self.root_hdlr)
        old_lastresort = logging.lastResort
        old_raise_exceptions = logging.raiseExceptions

        try:
            with support.captured_stderr() as stderr:
                root.debug('This should not appear')
                self.assertEqual(stderr.getvalue(), '')
                root.warning('Final chance!')
                self.assertEqual(stderr.getvalue(), 'Final chance!\n')

            # No handlers and no last resort, so 'No handlers' message
            logging.lastResort = None
            with support.captured_stderr() as stderr:
                root.warning('Final chance!')
                msg = 'No handlers could be found for logger "root"\n'
                self.assertEqual(stderr.getvalue(), msg)

            # 'No handlers' message only printed once
            with support.captured_stderr() as stderr:
                root.warning('Final chance!')
                self.assertEqual(stderr.getvalue(), '')

            # If raiseExceptions is False, no message is printed
            root.manager.emittedNoHandlerWarning = False
            logging.raiseExceptions = False
            with support.captured_stderr() as stderr:
                root.warning('Final chance!')
                self.assertEqual(stderr.getvalue(), '')
        finally:
            root.addHandler(self.root_hdlr)
            logging.lastResort = old_lastresort
            logging.raiseExceptions = old_raise_exceptions 

# 需要導入模塊: import logging [as 別名]
# 或者: from logging import lastResort [as 別名]
def test_last_resort(self):
        # Test the last resort handler
        root = self.root_logger
        root.removeHandler(self.root_hdlr)
        old_stderr = sys.stderr
        old_lastresort = logging.lastResort
        old_raise_exceptions = logging.raiseExceptions
        try:
            sys.stderr = sio = io.StringIO()
            root.debug('This should not appear')
            self.assertEqual(sio.getvalue(), '')
            root.warning('This is your final chance!')
            self.assertEqual(sio.getvalue(), 'This is your final chance!\n')
            #No handlers and no last resort, so 'No handlers' message
            logging.lastResort = None
            sys.stderr = sio = io.StringIO()
            root.warning('This is your final chance!')
            self.assertEqual(sio.getvalue(), 'No handlers could be found for logger "root"\n')
            # 'No handlers' message only printed once
            sys.stderr = sio = io.StringIO()
            root.warning('This is your final chance!')
            self.assertEqual(sio.getvalue(), '')
            root.manager.emittedNoHandlerWarning = False
            #If raiseExceptions is False, no message is printed
            logging.raiseExceptions = False
            sys.stderr = sio = io.StringIO()
            root.warning('This is your final chance!')
            self.assertEqual(sio.getvalue(), '')
        finally:
            sys.stderr = old_stderr
            root.addHandler(self.root_hdlr)
            logging.lastResort = old_lastresort
            logging.raiseExceptions = old_raise_exceptions 

# 需要導入模塊: import logging [as 別名]
# 或者: from logging import lastResort [as 別名]
def configure_standard_logging(verbosity: int, mode: LoggingMode):
    """Configure the standard library's `logging` module.

    Get `logging` working with options consistent with Twisted. NOTE CAREFULLY
    that `django.utils.log.DEFAULT_LOGGING` may have been applied (though only
    if installed and if configured in this environment). Those settings and
    the settings this function applies must be mentally combined to understand
    the resultant behaviour.

    :param verbosity: See `get_logging_level`.
    :param mode: The mode in which to configure logging. See `LoggingMode`.
    """
    set_standard_verbosity(verbosity)
    # Make sure that `logging` is not configured to capture warnings.
    logging.captureWarnings(False)
    # If a logger is ever configured `propagate=False` but without handlers
    # `logging.Logger.callHandlers` will employ the `lastResort` handler in
    # order that the log is not lost. This goes to standard error by default.
    # Here we arrange for these situations to be logged more distinctively so
    # that they're easier to diagnose.
    logging.lastResort = logging.StreamHandler(
        twistedModern.LoggingFile(
            logger=twistedModern.Logger("lost+found"),
            level=twistedModern.LogLevel.error,
        )
    ) 

# 需要導入模塊: import logging [as 別名]
# 或者: from logging import lastResort [as 別名]
def revision_call_handlers(self, record):  # 對logging標準模塊打猴子補丁。主要是使父命名空間的handler不重複記錄當前命名空間日誌已有種類的handler。
    """
    重要。這可以使同名logger或父logger隨意添加同種類型的handler，確保不會重複打印。

    :param self:
    :param record:
    :return:
    """

    """
    Pass a record to all relevant handlers.

    Loop through all handlers for this logger and its parents in the
    logger hierarchy. If no handler was found, output a one-off error
    message to sys.stderr. Stop searching up the hierarchy whenever a
    logger with the "propagate" attribute set to zero is found - that
    will be the last logger whose handlers are called.
    """
    c = self
    found = 0
    hdlr_type_set = set()

    while c:
        for hdlr in c.handlers:
            hdlr_type = type(hdlr)
            if hdlr_type == logging.StreamHandler:  # REMIND 因為很多handler都是繼承自StreamHandler，包括filehandler，直接判斷會邏輯出錯。
                hdlr_type = ColorHandler
            found = found + 1
            if record.levelno >= hdlr.level:
                if hdlr_type not in hdlr_type_set:
                    hdlr.handle(record)
                hdlr_type_set.add(hdlr_type)
        if not c.propagate:
            c = None  # break out
        else:
            c = c.parent
    # noinspection PyRedundantParentheses
    if (found == 0):
        if logging.lastResort:
            if record.levelno >= logging.lastResort.level:
                logging.lastResort.handle(record)
        elif logging.raiseExceptions and not self.manager.emittedNoHandlerWarning:
            sys.stderr.write("No handlers could be found for logger"
                             " \"%s\"\n" % self.name)
            self.manager.emittedNoHandlerWarning = True


# noinspection PyProtectedMember