routing_app.js

const express = require('express');
const request = require('request');
const bodyParser = require('body-parser');
const fs = require('fs');

const app = express();

app.use(express.json());
app.use(bodyParser.urlencoded({extended: false}));

const addressDetails = JSON.parse(fs.readFileSync('address.json'));

const remote = JSON.parse(fs.readFileSync('ips.json'));

app.post('/slack/actions', function (req, res) {
	console.log('[ROUTING APP]: Received http POST from slack, routing to endpoints...');
        var info = req.body.payload;
        for (var i = 0; i < remote.length; i++) {
                var ip = remote[i];
                console.log('[' + ip + ']: Sending http POST...')
                request.post('http://' + ip + ':5000/slack/actions', {
                  form: {
                    payload: info
                  }
                }, function (err, httpResponse, body) {
                        if(httpResponse) {
                                console.log('[' + httpResponse.connection.remoteAddress + ']: Received httpStatusCode ' + httpResponse.statusCode)
                        }
                })
        }
	res.end();
});

app.listen(addressDetails.port, addressDetails.ip, function () {
	console.log('[ROUTING APP]: Read %s ips from database: [%s]', remote.length, remote);
	console.log('[ROUTING APP]: Starting server on %s:%s', addressDetails.ip, addressDetails.port);
});