app.js

const express = require('express');

const {OrderBook, Order} = require('./lib/orderbook');

// create order book
const orderBook = new OrderBook();

// init generating random orders
orderBook.generateOrders();

let app = express();

app.get('/reset', (req, res) => {
    orderBook.reset();

    console.log('RESET');

    res.header('Access-Control-Allow-Origin', '*');
    res.header('Content-Type', 'application/json');
    res.send(JSON.stringify({'reset': true}));
});

app.get('/listOrders', (req, res) => {
    const start = parseInt(req.query.start, 10) || 0;
    const size = Math.min(parseInt(req.query.size, 10), 200) || 10;

    const orders = orderBook.getOrders(start, start + size);

    res.header('Access-Control-Allow-Origin', '*');
    res.header('Content-Type', 'application/json');
    res.send(JSON.stringify(orders));
});

console.log('Starting listening on: ' + (process.env.PORT || 5001));
app.listen(process.env.PORT || 5001);