Skip to main content

Decorators for actions executed in case of an exception

Project description

This package is intended to provide decorators which execute custom actions in case of exceptions. Let’s see an example:

First we need an object with some methods. These methods we decorate with the PrintOnFailure-decorator. This simple example decorator prints a given message in case of an exception.

>>> from failureaction import ConflictError
>>> from failureaction import PrintOnFailure
>>> class TestOb(object):
...    @PrintOnFailure(msg='Some numeric calculation went wrong!')
...    def divide(self, a, b):
...        return a/b
...    @PrintOnFailure()
...    def doraise(self):
...        raise ConflictError

We have two methods. One (divide) does numerical division of two numbers and another raises a custom defined ConflictError. Now let’s see the methods in action:

>>> ob = TestOb()
>>> ob.divide(4, 2)
>>> ob.divide(42, 0)
Some numeric calculation went wrong!
>>> ob.doraise()
Traceback (most recent call last):

The ActionOnFailure decorator provided by the module is intended to be overriden by a custom class. Like this:

>>> from failureaction import ActionOnFailure
>>> class MailOnFailure(ActionOnFailure):
...     def __init__(self, subject):
...         self.subject = subject
...     def _doaction(self, context, e):
...         """ send a mail, if an exception was raised """
...         print "Subject:", self.subject
...         print e
>>> class TestOb2(object):
...     @MailOnFailure(subject='An error occured')
...     def critical(self):
...         import _not_existent_hopefully_
>>> ob2 = TestOb2()
>>> ob2.critical()
Subject: An error occured
No module named _not_existent_hopefully_

Project details

Download files

Download the file for your platform. If you're not sure which to choose, learn more about installing packages.

Filename, size & hash SHA256 hash help File type Python version Upload date
failureaction-1.0a1.tar.gz (2.4 kB) Copy SHA256 hash SHA256 Source None Aug 26, 2010

Supported by

Elastic Elastic Search Pingdom Pingdom Monitoring Google Google BigQuery Sentry Sentry Error logging AWS AWS Cloud computing DataDog DataDog Monitoring Fastly Fastly CDN DigiCert DigiCert EV certificate StatusPage StatusPage Status page