promise-error-recovery.js

var HTTP = require("http-client");
var Q = require("promise");

// recovery
var httpReadRetryLoop = function (url, timeout, times) {
    return Q.when(HTTP.read(url), function (content) {
        return content;
    }, function (error) {
        if (times == 0)
            return error;
        return Q.when(delay(timeout), function () {
            return httpReadRetryLoop(url, timeout, times - 1);
        });
    });
}

// promise-based wrapper for setTimeout
var delay = function (timeout) {
    var deferred = Q.Deferred();
    setTimeout(function () {
        deferred.resolve();
    }, timeout);
    return deferred.promise;
};