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Probando las promesas en node con Q (versión 2)
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"use strict" | |
// Dependencias | |
var Q = require('q'); // Necesario instalar con $npm install Q | |
var http = require('http'); // Parte del core de node, no necesario instalar. | |
// Código de la función que devuelve una promesa | |
var promesa = function () { | |
console.log('Soy promesa: empiezo'); | |
var d = Q.defer(); | |
http.get("http://www.google.com/index.html", | |
function(res) { | |
d.resolve(res); | |
console.log("Got response: " + res.statusCode); | |
}) | |
.on('error', | |
function(e) { | |
console.log("Got error: " + e.message); | |
d.reject(err); | |
}); | |
console.log('Soy promesa: acabo'); | |
return d.promise; | |
}; | |
// Función para separar el tratamiento correcto | |
var onSuccess = function (obj) { | |
console.log('soy onSuccess'); | |
console.log(obj.headers.location); | |
}; | |
// Función para separar el tratamiento erróneo | |
var errorHandler = function (error) { | |
console.log('errorHandler'); | |
console.log(errors); | |
}; | |
// Lanzamos la promesa | |
console.log('Antes de lanzar la promesa:'); | |
var reply = promesa(); | |
reply | |
.then(onSuccess) | |
.fail(errorHandler) | |
.done(function() { console.log('fin')}); | |
console.log('Tras de lanzar la promesa:'); | |
console.log('EOF'); |
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