api.py 文件源码

def _retry_on_deadlock(f):
    """Decorator to retry a DB API call if Deadlock was received."""
    @functools.wraps(f)
    def wrapped(*args, **kwargs):
        while True:
            try:
                return f(*args, **kwargs)
            except db_exc.DBDeadlock:
                LOG.warning(_LW("Deadlock detected when running "
                                "'%(func_name)s': Retrying..."),
                            dict(func_name=f.__name__))
                # Retry!
                time.sleep(0.5)
                continue
    functools.update_wrapper(wrapped, f)
    return wrapped