silvrgit/lib/fx.js

const http = require('http');
let fxCache = {};
exports.doFx = function (req,res) {
        console.log('FX request');
        function fxQuery(callback, r) {
            let req = r;
            let options = {
                host: 'openexchangerates.org',
                //  port: 80,
                path: '/api/latest.json?app_id=0eb932cee3bc40259f824d4b4c96c7d2',
                // method: 'GET',
                headers: {
                    /*   'Content-Type': 'application/json',
                     'Content-Length': Buffer.byteLength(data)*/

                }
            };

            http.request(options).on('response', function (response) {
                let data = '';
                response.on("data", function (chunk) {
                    data += chunk;
                });
                response.on('end', function () {
                    console.log('Data done...');
                    callback(JSON.parse(data), r);
                });
              response.on('error', function(e) {
                              console.error(e);
                          });
            }).end();
        }

        let now = new Date();
        if (now - GLOBAL.fxLastCheck > (60000 * 14)) {
            fxQuery(function (a, b) {
                console.log(a);
                fxCache = a;
                GLOBAL.fxLastCheck = now;
                res.setHeader('Content-Type', 'application/json');
                res.end(JSON.stringify(fxCache));
            }, res);
        }
        else {
            console.log("Using cache");
            res.setHeader('Content-Type', 'application/json');
            console.log('Cache length:', JSON.stringify(fxCache).length);
            console.log(JSON.stringify(fxCache).substring(0,50));
            res.end(JSON.stringify(fxCache));
        }

};