old-silvrgit/lib/btc.js

 var http = require('http');
var btcCache = {};
exports.doBTC = function (req,res) {
        console.log('Bitcoin request');
        function btcQuery(callback, r) {
            var req = r;
            var options = {
                host: 'api.coindesk.com',
                //  port: 80,
                path: '/v1/bpi/currentprice.json',
                // method: 'GET',
                headers: {
                    /*   'Content-Type': 'application/json',
                     'Content-Length': Buffer.byteLength(data)*/

                }
            };

            http.request(options).on('response', function (response) {
                var data = '';
                response.on("data", function (chunk) {
                    data += chunk;
                });
                response.on('end', function () {
                    callback(JSON.parse(data), r);
                });
            }).end();
        }

        var now = new Date();
        if (now - GLOBAL.lastcheck > (59000 )) {
            btcQuery(function (a, b) {
               // console.log(a);
                console.log('Got btc data.')
                btcCache = a;
                GLOBAL.lastcheck = now;
                res.setHeader('Content-Type', 'application/json');
                res.end(JSON.stringify(btcCache));
            }, res)
        }
        else {
            console.log("Using cache");
            res.setHeader('Content-Type', 'application/json');
            res.end(JSON.stringify(btcCache));
        }
    };