explore-services/services/cache/mecache/cache.js

'use strict'

var express = require('express');
var app = express();
var mcache = require('memory-cache');
const request = require('superagent');

var cors = require('cors')
app.use(cors())

var cache = (duration) => {
  return (req, res, next) => {

    let key = '__express__' + req.originalUrl || req.url
    let cachedBody = mcache.get(key)
    if (cachedBody) {

      res.send(JSON.parse(cachedBody))
      return
    } else {
      res.sendResponse = res.send
      res.send = (body) => {
        mcache.put(key, body, duration * 1000);
        res.sendResponse(body)

      }
      next()
    }
  }
}


app.get('/get',cache(10), cors(), (req, res) => {
  setTimeout(() => {
    const url = (req.query)?req.query.url:null;
    if (!url){
        res.status(404).send('Not Found'); //not found

    }else{
     request.get(url, function (err, response) {
       // res.header("Access-Control-Allow-Origin", "http://localhost:3000");
       res.header("Access-Control-Allow-Headers", "Origin, Content-Type,  Content-Length");
       res.header("Access-Control-Allow-Methods", "GET,  OPTIONS");
       res.header("Access-Control-Allow-Methods", "GET,  OPTIONS");
       res.header("Content-Type","application/json");

          if (err) throw err;
          res.send(response.body);
    })
  }
})
});

app.use((req, res) => {
  res.status(404).send('Not Found') //not found
})

app.listen(process.env.PORT, function () {
  console.log(`Example app listening on port ${process.env.PORT}!`)
})