Question

我一直在查看与上下文记录相关的示例： Logging Cookbook

但是，我无法使用以下示例。该示例应该演示自定义适配器的使用，并继续如下：

然而，无论我尝试过什么，我总是会遇到一个关键错误：

bla bla bla bla bla bla
bla bla bla bla bla bla
bla bla bla bla bla bla
bla bla     *doAction*

我做错了什么？

---解决方案：EDIT_01 ---

我更改了代码，以便使用# Here is a simple example: class CustomAdapter(logging.LoggerAdapter): """ This example adapter expects the passed in dict-like object to have a 'connid' key, whose value in brackets is prepended to the log message. """ def process(self, msg, kwargs): return '[%s] %s' % (self.extra['connid'], msg), kwargs # which you can use like this: logger = logging.getLogger(__name__) adapter = CustomAdapter(logger, {'connid': some_conn_id}) # Then any events that you log to the adapter will have the value of some_conn_id prepended to the log messages.。它奏效了。但是，我不得不从格式化程序中删除logger = logging.getLogger(__name__) syslog = logging.StreamHandler() formatter = logging.Formatter('%(asctime)s <<<CONTEXT: %(my_context)s>>> : %(message)s') syslog.setFormatter(formatter) adapter = CustomAdapter(logger, {'my_context': '1956'}) logger.setLevel(logging.INFO) logger.addHandler(syslog) logger.info('The sky is so blue', {'my_context': '6642'}) Traceback (most recent call last): File "/Users/me/apps/Darwin64/python2.7/lib/python2.7/logging/__init__.py", line 859, in emit msg = self.format(record) File "/Users/me/apps/Darwin64/python2.7/lib/python2.7/logging/__init__.py", line 732, in format return fmt.format(record) File "/Users/me/apps/Darwin64/python2.7/lib/python2.7/logging/__init__.py", line 474, in format s = self._fmt % record.__dict__ KeyError: 'my_context' Logged from file myApp.py, line 62。但是，使用下面的代码，adapter.info('The sky is so blue', {'my_context': '6642'})位是硬编码的，无论我通过记录器传入什么，它都会显示初始值。有没有办法将一些值传递给适配器？

my_context

这总会产生：

my_context

即使我们将logger = logging.getLogger(__name__) syslog = logging.StreamHandler() formatter = logging.Formatter('%(asctime)s %(message)s') syslog.setFormatter(formatter) logger.addHandler(syslog) adapter = CustomAdapter(logger, {'my_context': '1956'}) logger.setLevel(logging.INFO) adapter.info('The sky is so blue', {'my_context': '6642'})传递给记录器。

Answer 1

您必须使用适配器进行日志记录，而不是记录器。试试这个：

import logging

class CustomAdapter(logging.LoggerAdapter):
    def process(self, msg, kwargs):
        # use my_context from kwargs or the default given on instantiation
        my_context = kwargs.pop('my_context', self.extra['my_context'])
        return '[%s] %s' % (my_context, msg), kwargs

logger = logging.getLogger(__name__)
syslog = logging.StreamHandler()
formatter = logging.Formatter('%(asctime)s %(message)s')
syslog.setFormatter(formatter)
logger.addHandler(syslog)
adapter = CustomAdapter(logger, {'my_context': '1956'})
logger.setLevel(logging.INFO)

adapter.info('The sky is so blue', my_context='6642')
adapter.info('The sky is so blue')

输出：

2016-09-13 14:49:28,539 [6642] The sky is so blue
2016-09-13 14:49:28,540 [1956] The sky is so blue

无法使此自定义日志记录适配器示例正常工作

1 个答案: