decorate webapp.RequestHandler each method , for trap any Exceptions

safeweb.py

#!/usr/bin/env python

import functools, logging

from django.utils import simplejson

def safeweb(srcfunc):
    def decorated(self, *vargs, **kwargs):
        try:
            return srcfunc(self, *vargs, **kwargs)
        except Exception, err:
            self.response.out.write( repr(err) )
            logging.warn( [ self.request.uri, srcfunc.__name__, repr(err) ] )
    decorated.__name__ = srcfunc.__name__
    decorated.__dict__ = srcfunc.__dict__
    return decorated

def safejson(srcfunc):
    def decorated(self, *vargs, **kwargs):
        try:
            return srcfunc(self, *vargs, **kwargs)
        except Exception, err:
            self.response.headers["content-type"] = "application/x-json"
            self.response.out.write( simplejson.dumps( repr(err) ) )
            logging.warn( [ self.request.uri, srcfunc.__name__, repr(err) ] )
    decorated.__name__ = srcfunc.__name__
    decorated.__dict__ = srcfunc.__dict__
    return decorated