Redis

Redis is an open-source, in-memory data structure store, used as a database, cache, and message broker

One of the key features of Redis is its ability to keep all data in memory, which allows for high performance and low latency access to data.

Starting redis locally

 docker run --name my-redis -d -p 6379:6379 redis
 docker exec -it container_id /bin/bash
 redis-cli

HSET user:100 name "Sumit Nair" email "sumit.nair26@gmail.com" age "30"
HGET user:100 name
HGET user:100 email

You can also push to a topic / queue on Redis and other processes can pop from it.

The last argument represents the timeout before the blocking should be stopped

There are various clients that exist that let you talk to redis via Node.js

Let’s initialize a simple Node.js express server that takes a problem submission as input and sends it to the queue.

Let’s also create a worker service that picks up a problem, waits for 2 seconds and then proceeds to pick the next one.

To run this project locally, follow these steps:

git clone https://github.com/sumitnair26/redis-nodejs

Go to Postman

Send Post Request to http://localhost:3000/submit - Params :

 {   
 	    "problemId":"1",
 	    "code":"Some Code",
 	    "language":"Hindi"
 }