__init__.py 文件源码

def _set_cache(self, app, config):
        import_me = config['CACHE_TYPE']
        if '.' not in import_me:
            from . import backends

            try:
                cache_obj = getattr(backends, import_me)
            except AttributeError:
                raise ImportError("%s is not a valid FlaskCache backend" % (
                                  import_me))
        else:
            cache_obj = import_string(import_me)

        cache_args = config['CACHE_ARGS'][:]
        cache_options = {'default_timeout': config['CACHE_DEFAULT_TIMEOUT']}

        if config['CACHE_OPTIONS']:
            cache_options.update(config['CACHE_OPTIONS'])

        if not hasattr(app, 'extensions'):
            app.extensions = {}

        app.extensions.setdefault('cache', {})
        app.extensions['cache'][self] = cache_obj(
                app, config, cache_args, cache_options)