Python flask_cache 模块，Cache() 实例源码

def build_cache_from_config(app):
    cfg = app.config
    cache_type = cfg.get('CACHE_TYPE')

    if cache_type is None:
        return None

    cache_config = {'CACHE_TYPE': cache_type}

    if cache_type == 'redis':
        cache_config.update({
            'CACHE_KEY_PREFIX': cfg['CACHE_KEY_PREFIX'],
            'CACHE_REDIS_HOST': cfg['CACHE_REDIS_HOST'],
            'CACHE_REDIS_PORT': cfg['CACHE_REDIS_PORT'],
            'CACHE_REDIS_URL': cfg['CACHE_REDIS_URL']
        })

    cache = Cache(config=cache_config)

    return cache

def cache(self):
        # Remove annoying depcration warning from flask-cache
        from flask.exthook import ExtDeprecationWarning
        warnings.simplefilter('ignore', ExtDeprecationWarning)

        if hasattr(self, '_cache'):
            return self._cache
        if CACHE_BACKEND_URI == 'memory://':
            cache = Cache(app, config={'CACHE_TYPE': 'simple'})
        elif CACHE_BACKEND_URI.startswith('redis://'):
            try:
                from redis import from_url as redis_from_url
                redis_from_url(CACHE_BACKEND_URI)
            except:
                print('BAD REDIS URL PROVIDED BY (CACHE_BACKEND_URI)')
                exit(1)

            cache = Cache(app, config={
                'CACHE_TYPE': 'redis',
                'CACHE_REDIS_URL': CACHE_BACKEND_URI,
                'CACHE_DEFAULT_TIMEOUT': 0  # NEVER EXPIRES
            })

        cache.init_app(self.app)
        self._cache = cache
        return self._cache

def configure_cache(app, config):
    cache_config = {
        'CACHE_TYPE': config.get('cache', 'type')
    }

    if cache_config['CACHE_TYPE'] == 'redis':
        cache_config['CACHE_REDIS_HOST'] = config.get('redis', 'host')
        cache_config['CACHE_REDIS_PORT'] = config.getint('redis', 'port')

    cache = Cache(app, config=cache_config)
    return cache

def _config_caching(self):
        from flask_cache import Cache
        self.cache = Cache(self)