xo.py 文件源码

def load_toml_xo_config(filename):
    """Returns a XOConfig created by loading a TOML file from the
    filesystem.

    Args:
        filename (string): The name of the file to load the config from

    Returns:
        config (XOConfig): The XOConfig created from the stored
            toml file.

    Raises:
        LocalConfigurationError
    """
    if not os.path.exists(filename):
        LOGGER.info(
            "Skipping transaction proccesor config loading from non-existent"
            " config file: %s", filename)
        return XOConfig()

    LOGGER.info("Loading transaction processor information from config: %s",
                filename)

    try:
        with open(filename) as fd:
            raw_config = fd.read()
    except IOError as e:
        raise LocalConfigurationError(
            "Unable to load transaction processor configuration file:"
            " {}".format(str(e)))

    toml_config = toml.loads(raw_config)
    invalid_keys = set(toml_config.keys()).difference(
        ['connect'])
    if invalid_keys:
        raise LocalConfigurationError(
            "Invalid keys in transaction processor config: "
            "{}".format(", ".join(sorted(list(invalid_keys)))))

    config = XOConfig(
        connect=toml_config.get("connect", None)
    )

    return config