Python AOP Framework
Python AOP Framework is a minimal Framework to use Aspect-Oriented Programming on your Python applications
Examples
Definition of Aspects
>>> import logging
>>> from aop import Aspect
>>>
>>> class InvocationLoggerAspect(Aspect):
... def __init__(self, *args, **kwargs):
... super().__init__(*args, **kwargs)
... self.logger = logging.getLogger('python-aop')
... self.logger.setLevel(logging.DEBUG)
...
... fh = logging.FileHandler('auth.log')
... fh.setLevel(logging.DEBUG)
...
... self.logger.addHandler(fh)
...
... def before(self, *args, **kwargs):
... self.logger.info(
... 'Invocation: name=%s, args=%s, kwargs=%s' % (
... self.function,
... args,
... kwargs
... )
... )
...
>>>
Use of Aspect over functions
If we want to log each invocation attempt we can apply the aspect directly to a function
>>> def auth(user, password):
... if user == 'aop' and password == '#$%3&23%#$(%':
... return True
... return False
...
>>>
>>> auth = InvocationLoggerAspect(auth)
>>>
>>> auth('aop', '#$%3&23%#$(%')
True
>>> auth('aop', '')
False
>>>
The content of auth.log:
Invocation: name=<function auth at 0x7f1e30282290>, args=('aop', '#$%3&23%#$(%'), kwargs={}
Invocation: name=<function auth at 0x7f1e30282290>, args=('aop', ''), kwargs={}
Use of AspectType
>>> import logging
>>> from aop import Aspect, AspectType
>>>
>>> class InvocationLoggerAspect(Aspect):
... def __init__(self, *args, **kwargs):
... super().__init__(*args, **kwargs)
... self.logger = logging.getLogger('python-aop')
... self.logger.setLevel(logging.DEBUG)
...
... fh = logging.FileHandler('auth.log')
... fh.setLevel(logging.DEBUG)
...
... self.logger.addHandler(fh)
...
... def before(self, *args, **kwargs):
... self.logger.info(
... 'Invocation: name=%s, args=%s, kwargs=%s' % (
... self.function,
... args,
... kwargs
... )
... )
...
>>>
>>> class AuthenticationBackend(metaclass=AspectType):
... def auth(self, user, password):
... if user == 'aop' and password == '#$%3&23%#$(%':
... return True
... return False
...
>>> AuthenticationBackend.pointcut('auth', InvocationLoggerAspect)
>>>
>>> backend = AuthenticationBackend()
>>> backend.auth('aop', '#$%3&23%#$(%')
True
>>> backend.auth('aop', '')
False
>>>
