__init__.py 文件源码

def _initialize():
    import json
    import os.path
    from flask import Flask
    from flask_sqlalchemy import SQLAlchemy

    config_path = os.environ.get('LIBRARIAN_CONFIG_PATH', 'server-config.json')
    with open(config_path) as f:
        config = json.load(f)

    if 'SECRET_KEY' not in config:
        print('cannot start server: must define the Flask "secret key" as the item '
              '"SECRET_KEY" in "server-config.json"', file=sys.stderr)
        sys.exit(1)

    # TODO: configurable logging parameters will likely be helpful. We use UTC
    # for timestamps using standard ISO-8601 formatting. The Python docs claim
    # that 8601 is the default format but this does not appear to be true.
    loglevel_cfg = config.get('log_level', 'info')
    loglevel = _log_level_names.get(loglevel_cfg)
    warn_loglevel = (loglevel is None)
    if warn_loglevel:
        loglevel = logging.INFO

    logging.basicConfig(
        level=loglevel,
        format='%(asctime)s %(levelname)s: %(message)s',
        datefmt='%Y-%m-%dT%H:%M:%SZ'
    )
    import time
    logging.getLogger('').handlers[0].formatter.converter = time.gmtime
    logger = logging.getLogger('librarian')

    if warn_loglevel:
        logger.warn('unrecognized value %r for "log_level" config item', loglevel_cfg)

    tf = os.path.join(os.path.dirname(os.path.abspath(__file__)), 'templates')
    app = Flask('librarian', template_folder=tf)
    app.config.update(config)
    db = SQLAlchemy(app)
    return logger, app, db