manage.py 文件源码

def debug(fn):
    """
    Function/method decorator to trace calls via debug logging.
    Is a pass-thru if we're not at LOG_LEVEL=DEBUG. Normally this
    would have a lot of perf impact but this application doesn't
    have significant throughput.
    """
    @wraps(fn)
    def wrapper(*args, **kwargs):
        try:
            # because we have concurrent processes running we want
            # to tag each stack with an identifier for that process
            arg = "[{}]".format(sys.argv[1])
        except IndexError:
            arg = "[pre_start]"
        name = '{}{}{}'.format(arg, (len(inspect.stack()) * " "), fn.__name__)
        log.debug('%s' % name)
        out = apply(fn, args, kwargs)
        log.debug('%s: %s', name, out)
        return out
    return wrapper