stocks.js

var sys = require('util');
var rest = require('restler');
var fs = require('fs');

var database = {};
var list = [ 'AAPL', 'IBM', 'GE' ];
var done = 0;

function save_all_tickers() {
	console.log('done, all data:', database);
	fs.writeFile('output.json', JSON.stringify(database), function(done) {
		console.log('file written, program will exit.');
	});
}

function one_ticker_done(name, result) {
	console.log('one_ticker_done', name, result);
	if (result instanceof Error) {
		console.log(name + ' failed, retrying...');
		this.retry(5000);
	} else {
		console.log(name + ' got: ' + result);
		var arr = result.split(',');
		if (typeof(database[name]) == 'undefined') {
			database[name] = arr[5]; // sixth number is the actual value
			done ++;
			if (done == list.length) {
				// all done.
				save_all_tickers();
			}
		}
	}
}

function download_one_ticker(name) {
	console.log('downloading ' + name + ' ...');
	rest.get('http://finance.yahoo.com/d/quotes.csv?s=' + name + '&f=snl1d1t1ohgdr')
		.on('complete', one_ticker_done.bind(this, name));
}

list.forEach(download_one_ticker);