Prosen-Ghosh

const Redis = require("ioredis");
const redis = new Redis();

app.post("/login", async (req, res) => {
    const userId = req.body.userId;
    const timestamp = Date.now();
    const bitmapKey = `user_login:${userId}`;
    const offset = Math.floor(timestamp / (24 * 60 * 60 * 1000));

    await redis.setbit(bitmapKey, offset, 1);

Prosen-Ghosh

const Redis = require("ioredis");
const redis = new Redis();

app.use(async (req, res, next) => {
    const userIp = req.ip;
    const currentTime = Date.now();
    const rateLimit = 100; // Number of requests per hour
    const rateLimitPeriod = 3600; // 1 hour
    const rateLimitKey = `rate_limit:${userIp}`;

Prosen-Ghosh

sudo apt-get install redis-server
sudo service redis-server start

Prosen-Ghosh

const Redis = require("ioredis");
const redis = new Redis();

// Acquire lock
const lock = await redis.set("lock:resource", "locked", "EX", 10, "NX");

if (lock === "OK") {
    // Do something with the resource
    console.log("Lock acquired");
    // Release lock

Prosen-Ghosh

const Redis = require("ioredis");
const redis = new Redis();

redis.get("page:home").then(cacheData => {
  if (cacheData) {
    console.log(JSON.parse(cacheData));
  } else {
    // Fetch data from database
    const data = await fetchDataFromDb();
    // set cache data for page

Prosen-Ghosh

const Redis = require("ioredis");
const redis = new Redis();

// Fetch data from database
const data = await fetchDataFromDb();

// set cache data for page
redis.set("page:home", JSON.stringify(data));

Prosen-Ghosh

const Redis = require("ioredis");
const redis = new Redis();

redis.get("session:user1").then(sessionData => {
  console.log(JSON.parse(sessionData));
  // Output: { username: "user1", email: "user1@example.com" }
});

Prosen-Ghosh

const Redis = require("ioredis");
const redis = new Redis();

// set session data for user
redis.set("session:user1", JSON.stringify({
  username: "user1",
  email: "user1@example.com"
}));

Prosen-Ghosh

var button = document.getElementById("myButton");

button.addEventListener("click", function() {
    document.body.style.overflow = 'hidden';
});

Prosen-Ghosh

// Disable scrolling
document.getElementById("content-area").style.position = "fixed";
document.getElementById("content-area").style.top = "0";

// Enable scrolling
document.getElementById("content-area").style.position = "relative";
document.getElementById("content-area").style.top = "auto";