拦截Python中的方法调用 [英] Intercept method calls in Python

问题描述

我正在用 python 实现一个 RESTful Web 服务，并希望通过拦截函数调用并记录它们的执行时间等来添加一些 QOS 日志记录功能.

I'm implementing a RESTful web service in python and would like to add some QOS logging functionality by intercepting function calls and logging their execution time and so on.

基本上我想到了一个所有其他服务都可以继承的类，它自动覆盖默认方法实现并将它们包装在记录器函数中.实现这一目标的最佳方法是什么?

Basically i thought of a class from which all other services can inherit, that automatically overrides the default method implementations and wraps them in a logger function. What's the best way to achieve this?

推荐答案

类似这样的事情?这隐含地向您的方法添加了一个装饰器(如果您愿意，也可以基于此创建一个显式装饰器):

Something like this? This implictly adds a decorator to your method (you can also make an explicit decorator based on this if you prefer that):

class Foo(object):
    def __getattribute__(self,name):
        attr = object.__getattribute__(self, name)
        if hasattr(attr, '__call__'):
            def newfunc(*args, **kwargs):
                print('before calling %s' %attr.__name__)
                result = attr(*args, **kwargs)
                print('done calling %s' %attr.__name__)
                return result
            return newfunc
        else:
            return attr

当您现在尝试以下操作时:

when you now try something like:

class Bar(Foo):
    def myFunc(self, data):
        print("myFunc: %s"% data)

bar = Bar()
bar.myFunc(5)

你会得到:

before calling myFunc
myFunc:  5
done calling myFunc

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