Node.js - Express Clustered URL shortener service in PostgreSQL

db.mjs

import { DataTypes, Sequelize } from "sequelize";

const dbUser = process.env.dbUser;
const dbUserPass = process.env.dbUserPass;
const dbName = process.env.dbName;

const sequelize = new Sequelize(
  `postgres://${dbUser}:${dbUserPass}@localhost:5432/${dbName}`,
  {
    logging: false,
    pool: {
      max: 10,
      min: 10,
    },
  },
);
await sequelize.authenticate();

const ShortenedUrl = sequelize.define("shortenedurl", {
  id: {
    type: DataTypes.STRING,
    primaryKey: true,
  },
  srcurl: DataTypes.STRING,
  created: DataTypes.DATE,
  lastaccessed: DataTypes.DATE,
}, {
  timestamps: false,
});

export async function save(id, srcUrl) {
  await ShortenedUrl.create({
    id,
    srcurl: srcUrl,
    created: new Date(),
    lastaccessed: new Date(),
  });
  return true;
}

expressController.mjs

import { shorten } from "./service.mjs";

export async function handleRequest(req, res) {
  if (!(req.body && req.body.srcUrl)) {
    return res.status(400).send({ errMsg: "Parameter 'srcUrl' is missing" });
  }

  const srcUrl = req.body.srcUrl;
  if (srcUrl.length > 250) {
    return res.status(400).send({
      errMsg: "Parameter 'srcUrl' must not be more than 250 characters",
    });
  }
  if (!(srcUrl.startsWith("http://") || srcUrl.startsWith("https://"))) {
    return res.status(400).send({
      errMsg: "Parameter 'srcUrl' must start with http:// or https://",
    });
  }

  const shortenedUrl = await shorten(srcUrl);
  if (!shortenedUrl) {
    return res.status(500).send({ errMsg: "Failed to shorten" });
  }
  res.json({ srcUrl, shortenedUrl });
}

main.mjs

import cluster from "node:cluster";
import express from "express";
import { handleRequest } from "./expressController.mjs";

const numClusterWorkers = parseInt(process.argv[2] || 1);

if (cluster.isPrimary) {
  for (let i = 0; i < numClusterWorkers; i++) {
    cluster.fork();
  }

  cluster.on(
    "exit",
    (worker, code, signal) => console.log(`worker ${worker.process.pid} died`),
  );
} else {
  const app = express();
  app.use(express.json());

  app.post("/shorten", handleRequest);

  app.listen(3000);
}

service.mjs

import { nanoid } from "nanoid";
import { save } from "./db.mjs";
const baseUrl = "http://test.short/";

export async function shorten(srcUrl) {
  if (!srcUrl) {
    return;
  }

  const urlId = nanoid(10);
  const shortenedUrl = `${baseUrl}${urlId}`;

  const dbStatus = await save(urlId, srcUrl);
  return dbStatus ? shortenedUrl : undefined;
}