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borgend/exprotect.py@6993964140bd

borgend/exprotect.py

Wed, 07 Feb 2018 20:39:01 +0000

author

Tuomo Valkonen <tuomov@iki.fi>

date

Wed, 07 Feb 2018 20:39:01 +0000

changeset 113

6993964140bd

parent 106

a7bdc239ef62

permissions

-rw-r--r--

Time snapshot fixes.
Python's default arguments are purely idiotic (aka. pythonic): generated
only once. This makes sense in a purely functional language, which Python
lightyears away from, but severely limits their usefulness in an imperative
language. Decorators also seem clumsy for this, as one would have to tell
the number of positional arguments for things to work nice, being able to
pass the snapshot both positionally and as keyword. No luck.
So have to do things the old-fashioned hard way.

#
# Borgend by Tuomo Valkonen, 2018
#
# Except-catching decocators to catch bugs in callbacks
#

import logging

logger=logging.getLogger(__name__)

def protect_noreturn(fn):
    name=fn.__name__
    def wrapper(*args, **kwargs):
        try:
            fn(*args, **kwargs)
        except:
            logger.exception('bug in ' + name)
    return wrapper


def protect_return(default):
    def wrap(fn):
        name=fn.__name__
        def wrapper(*args, **kwargs):
            try:
                return fn(*args, **kwargs)
            except:
                logger.exception('bug in ' + name)
                return default
        return wrapper
    return wrap