const cacheManager = require('cache-manager');
const fsStore = require('cache-manager-fs-hash');

const diskCache = cacheManager.caching({
    store: fsStore,
    options: {
        path: 'diskcache', //path for cached files
        ttl: 60 * 60,      //time to life in seconds
        subdirs: true,     //create subdirectories to reduce the
                           //files in a single dir (default: false)
        zip: true,         //zip files to save diskspace (default: false)
    }
});


(async () => {

    await diskCache.set('key', 'value');
    console.log(await diskCache.get('key')); //"value"
    await diskCache.del('key');
    console.log(await diskCache.get('key')); //undefined


    console.log(await getUserCached(5)); //{id: 5, name: '...'}
    console.log(await getUserCached(5)); //{id: 5, name: '...'}

    await diskCache.reset();

    function getUserCached(userId) {
        return diskCache.wrap(userId /* cache key */, function () {
            return getUser(userId);
        });
    }

    async function getUser(userId) {
        return {id: userId, name: '...'};
    }

})();