main.py 文件源码

def override_config(config, override):
    '''Overrides the given config by tornado.options'''

    # Init config object
    if 'tornado' not in config:
        config['tornado'] = {}
    if config['tornado'].get('server') is None:
        config['tornado']['server'] = {}
    if config['tornado'].get('app_settings') is None:
        config['tornado']['app_settings'] = {}
    if 'db' not in config:
        config['db'] = {}


    # Handle host, port, base, with the following priorities
    # 1. command line arg (by tornado.options)
    # 2. config file
    # 3. hardcoded default
    server_cfg = config['tornado']['server']
    host = find_first([override.get('host'), server_cfg.get('host'), DEFAULT_HOST])
    port = find_first([override.get('port'), server_cfg.get('port'), DEFAULT_PORT])
    base = find_first([override.get('base'), server_cfg.get('base'), DEFAULT_BASE])
    config['tornado']['server'].update(dict(host=host, port=port, base=base))

    # If the debug flag is set, save it in app_settings and activate db echo
    if override.get('debug') is not None:
        config['tornado']['app_settings']['debug'] = override.get('debug')
        config['db']['echo'] = override.get('debug') == 2

    # Set up default database uri if it is not given
    db_uri = find_first([override.get('db_path'), config['db'].get('uri'), DEFAULT_DEV_DB_URI])
    config['db']['uri'] = db_uri

    # Set up default cookie secret if it is not given
    cookie_secret = config['tornado']['app_settings'].get('cookie_secret')
    cookie_secret = find_first([cookie_secret, DEFAULT_COOKIE_SECRET])
    config['tornado']['app_settings']['cookie_secret'] = cookie_secret