base.py 文件源码

def action_peek_json(body):
    """Determine action to invoke."""

    try:
        decoded = jsonutils.loads(body)
    except ValueError:
        msg = "cannot understand JSON"
        raise exception.MalformedRequestBody(reason=msg)

    # Make sure there's exactly one key...
    if len(decoded) != 1:
        msg = "too many body keys"
        raise exception.MalformedRequestBody(reason=msg)

    # Return the action and the decoded body...
    return list(decoded.keys())[0]