let answer = redis_client.get('counter', (e, r) => {
    console.log(r);
});
console.log(answer);

const client = Promise.promisifyAll(redis_client);

async function doSOmething(){
    let r = await redis_client.getAsync('counter');
    console.log(r);

    console.log(answer);
    // много остального кода
}