Getting rid of Django IOErrors

Extending the solution by @dlowe for Django 1.3, we can write the full working example as:

settings.py

LOGGING = {
    'version': 1,
    'disable_existing_loggers': False,
    'filters': {
        'supress_unreadable_post': {
            '()': 'common.logging.SuppressUnreadablePost',
        }
    },
    'handlers': {
        'mail_admins': {
            'level': 'ERROR',
            'class': 'django.utils.log.AdminEmailHandler',
            'filters': ['supress_unreadable_post'],
        }
    },
    'loggers': {
        'django.request': {
            'handlers': ['mail_admins'],
            'level': 'ERROR',
            'propagate': True,
        },
    }
}

common/logging.py

import sys, traceback

class SuppressUnreadablePost(object):
    def filter(self, record):
        _, exception, tb = sys.exc_info()
        if isinstance(exception, IOError):
            for _, _, function, _ in traceback.extract_tb(tb):
                if function == '_get_raw_post_data':
                    return False
        return True

You should be able to write a Middleware to catch the exception and you can then "silence" those specific exceptions.

https://docs.djangoproject.com/en/2.2/topics/http/middleware/

In django 1.3 and up, you can use a logging filter class to suppress the exceptions which you aren't interested in. Here's the logging filter class I'm using to narrowly suppress IOError exceptions raised from _get_raw_post_data():

import sys, traceback
class _SuppressUnreadablePost(object):
    def filter(self, record):
        _, exception, tb = sys.exc_info()
        if isinstance(exception, IOError):
            for _, _, function, _ in traceback.extract_tb(tb):
                if function == '_get_raw_post_data':
                    return False
        return True

In Django 1.4, you will be able to do away with most of the complexity and suppress the new exception class UnreadablePostError. (See this patch).