The problem is that this function returns an empty array. The array im talking about is hoster.

gistfile1.txt

portal.getHosterByStream = function(stream, callback) {
	request(URL + stream, function (error, response, body) {
		if (!error && response.statusCode === 200) {
			var hoster = [];
			var $ = cheerio.load(body);
			var information = $('body div[id=frmMain] div[id=dontbeevil] div[id=Vadda]').html();
			var items_hoster = $(information).find("ul[id=HosterList]").html();
			
			$(items_hoster).each(function (i, item) {
				var rel = $(item).attr('rel');

				if (rel != undefined) {
					request(MIRROR + rel, function (error, response, body) {
						if (!error && response.statusCode === 200) {
							var host = JSON.parse(body);

							var href = "";
							var positionHref = 9;
							var i = 0;
							
							while (host.Stream.substr(positionHref + i, 1) != '"') {
								href = util.format('%s%s', href, host.Stream.substr(positionHref + i, 1));

								i++;
							}
							hoster.push(href);
						} else {
							console.log('error second request');
						}
					});
				}
			});
			callback(hoster);
		} else {
			console.log('error request page');
		}
	});
}

Not tested, but i think i got this problem before.
The each at Line 9 returns imidiately, so the callback Line 33 get executed before the array is filed.
You might have a look at array filter/map (and/or take the nodeschool.io functional programming lesson).