r2c-url-shortener/src/configs/init.config.js

Quick, Reusable, Reliable, Collision-free URL shortener with Redis and Postgres support

let pool = null;
let redisClient = null;
let redisReady = null;

const initPostgres = ({ username, password, host, database, port }) => {
  const { Pool } = require('pg');
  pool = new Pool({
    user: username,
    password,
    host,
    database,
    port,
  });
  return pool;
};

const initRedis = ({ url }) => {
  const redis = require('redis');
  redisClient = redis.createClient({ url });

  redisReady = redisClient.connect()
    .then(() => {})
    .catch(err => {
      redisClient = null;
    });
};

const waitForRedis = async () => {
  if (!redisClient || !redisReady) throw new Error("Redis not initialized");
  await redisReady;
  return redisClient;
};

const getConnections = async () => {
  if (!pool || !redisClient) {
    throw new Error("Postgres or Redis not initialized. Please call initPostgres() and initRedis() first.");
  }
  await redisReady;
  return { pool, redisClient };
};

module.exports = {
  initPostgres,
  initRedis,
  getConnections,
  waitForRedis,
};