Cache / Idempotent controller for ExpressJs

const express = require('express')
const app = express() 
const idempotency = require('express-idempotent-redis');
let redis = require("redis"),
    client = redis.createClient();

let counter = 0;
app.use(idempotency({
    redisClient: client
}));

app.get('/', (req, res) =>  {
    counter++;
    res.send(`Hello. This route was executed ${counter} times`);
})

app.listen(3000, () => console.log('Example app listening on port 3000!'))

Installation

This is a Node.js module available through the npm registry.

Before installing, download and install Node.js. Node.js 0.10 or higher is required.

Installation is done using the npm install command:

$ npm install express
$ npm install redis
$ npm install express-idempotent-redis 

Features

• Works as Cache for Express using Redis
• Focus on high performance
• Guarantees Idempotent calls for all HTTP verbs

Guide

• The API caller needs to send a IdEmpotent key on header (Default is 'IDEmpKey')
• The builder accepts the following parameters:
  • redisClient => Mandatory. This will be your already initiated Redis Client
  • idempotencyKey => The key that will be monitored (Default is 'IDEmpKey')
  • sleepTime => As your route will only be executed once, this is how long subsequent calls should wait for the main (first) request to finish (in miliseconds)
  • secondsToCache => How long the request should be cached

Important

The middleware parses all results. If you want to receive a non parsed JSON string. You should add avoidParse: True to the header [npm-url]: https://www.npmjs.com/package/express-idempotent-redis [downloads-url]: https://npmjs.org/package/express-idempotent-redis