So I'm currently trying to make an http status code checker. But for some reason the response hostname is returning undefined, yet i can retrieve the response statusCode. Am I grabbing it properly?
var fs = require('fs');
var http = require('http');
var stdin = process.openStdin();
stdin.addListener('data', function (userInput) {
var urlListPath = userInput.toString().trim();
fs.readFile(urlListPath, function (err, data) {
if (err) {
return console.log(err);
}
var urlArray = data.toString().split("\n");
urlArray = urlArray.filter(Boolean);
for (var i = 0; i < urlArray.length; i++){
http.get({hostname: urlArray[i]}, function(res){
console.log(res.hostname + ' | ' + res.statusCode + ' | ' + res.statusMessage);
});
}
});
});
Solved by wrapping in a function as #bluesman suggested:
var fs = require('fs');
var http = require('http');
var stdin = process.openStdin();
stdin.addListener('data', function (userInput) {
var urlListPath = userInput.toString().trim();
fs.readFile(urlListPath, function (err, data) {
if (err) {
return console.log(err);
}
var urlArray = data.toString().split("\n");
urlArray = urlArray.filter(Boolean);
for (var i = 0; i < urlArray.length; i++){
getHttpInfo(urlArray[i]);
}
});
});
function getHttpInfo(url){
http.get({hostname: url}, function(res){
console.log(url + ' : ' + res.statusCode + ' | ' + res.statusMessage);
});
}
Related
When I go to an image all I get is a square box
This is running latest node as of today I've tried opening the binary file in utf8 and tried not specifying the encoding
var fs = require("fs");
var net = require("net");
var tls = require("tls");
var config = require("config");
var clients = [];
mount = ";";
function get(data) {
var r = /GET\s(.+)\sHTTP/gms;
var rt = r.exec(data)
if (rt != null) { return rt[1] }
}
function handle_data(data, socket) {
if (get(data) == "/") {
var read = fs.readFile("index.html", function(err, data) {
if (err){
console.log(err);
}
var data = data.toString();
var content = data.replace("{port}", config.JCasterPort).replace("{mount}", mount);
var length = content.length
var header = config.HTTP_RESP.replace("{length}", length).replace("{cts}", content).replace("{type}", "text/html");
socket.write(header)
});
}
if (get(data) == "/img/content-bg.png") {
var read = fs.readFile("img/content-bg.png", "utf8", function(err, data) {
if (err){
console.log(err);
}
var data = data.toString();
var content = data;
var length = content.length
var header = config.HTTP_RESP.replace("{length}", length).replace("{cts}", content).replace("{type}", "image/png");
socket.write(header)
});
}
if (get(data) == "/img/background.gif") {
var read = fs.readFile("img/background.gif", "utf8", function(err, data) {
if (err){
console.log(err);
}
var data = data.toString();
var content = data;
var length = content.length
var header = config.HTTP_RESP.replace("{length}", length).replace("{cts}", content).replace("{type}", "image/gif");
socket.write(header)
});
}
if (get(data) == "/img/background.jpg") {
var read = fs.readFile("img/background.jpg", function(err, data) {
if (err){
console.log(err);
}
var data = data.toString()
var content = data;
var length = content.length
var header = config.HTTP_RESP.replace("{length}", length).replace("{cts}", content).replace("{type}", "image/jpg");
socket.write(header)
});
}
}
if (config.JCasterSSL) {
var key = config.JCasterKey;
var cert = config.JCasterCert;
var options = {
key: fs.readFileSync(key),
cert: fs.readFileSync(cert)
};
var server = tls.createServer(options, function(socket) {
socket.on("data", function(data) {
var data = data.toString();
handle_data(data, socket)
});
});
server.listen(config.JCasterPort, function(){
console.log("Listening on port: " + config.JCasterPort)
});
} else {
}
//HTTP_RESP = HTTP/1.1 200 OK\r\nContent-Type: {type}\r\nContent-Length: {length}\r\n\r\n{cts}
My goal is to display the images I know I can use the built in http/https library but I need it to be able to broadcast audio data
the only thing I haven't tried was encoding to ASCII
I want to download multiple files from the web using this code:
var fs = require('fs');
var http = require('http');
var request = require('request');
var file;
for(var i = 1; i <= 5; i++) {
//CHECK IF REMOTE FILE EXISTS
request('http://webaddress.com/filename' + i + '.jar', function (err, resp) {
//IF EXISTS DO
if (resp.statusCode == 200) {
//DOWNLOAD DATA AND CREATE A NEW .JAR FILE
file = fs.createWriteStream('D:\\filename' + i + '.jar');
http.get('http://webaddress.com/filename' + i + '.jar', function(response) {
response.pipe(file);
file.on('finish', function() {
file.close();
});
});
}
//FILE DOES NOT EXIST
});
}
The result I want is: multiple files downloaded with filenames filename1-5.jar. The result I am getting is just 1 file with filename filename5.jar (or the last value of the i var in the loop). What am I doing wrong?
Like #Ionut said your requests are async so you need to wait for it
let fs = require('fs');
let request = require('request');
let download = (uri, filename) => {
return new Promise ((resolve, reject) => {
request.head(uri, function(err, res) {
if (res.statusCode === 200) {
request(uri).pipe(fs.createWriteStream(filename)).on('close', resolve);
} else {
reject(res.statusCode);
}
});
});
};
let promises = [];
for(let i = 1; i <= 5; i++) {
promises.push(download('http://webaddress.com/filename' + i + '.jar', 'D:\\filename' + i + '.jar'));
}
Promise.all(promises).then(() => {
process.exit(0);
});
Your request is asynchronous and it will execute only after your loop finishes hence the 5 from the filename. A solution for this is to threat your code separately by creating a new function and call it inside the loop:
var fs = require('fs');
var http = require('http');
var request = require('request');
var file;
function customRequest(i){
//CHECK IF REMOTE FILE EXISTS
return request('http://webaddress.com/filename' + i + '.jar', function(err, resp) {
//IF EXISTS DO
if (resp.statusCode == 200) {
//DOWNLOAD DATA AND CREATE A NEW .JAR FILE
file = fs.createWriteStream('D:\\filename' + i + '.jar');
http.get('http://webaddress.com/filename' + i + '.jar', function(response) {
response.pipe(file);
file.on('finish', function() {
file.close();
});
});
}
//FILE DOES NOT EXIST
});
}
for (var i = 1; i <= 5; i++) {
customRequest(i)
}
I have just started learning to code about 5 days ago and what I'm struggling to achieve, is to have an rssfeed-to-twitter script that posts a shortened url instead of a full website/article feed url. I found a node.js module called TinyURL that could do that but i struggle to get it to work. Here's the full script:
var simpleTwitter = require('simple-twitter');
var fs = require('fs');
var http = require('http');
http.createServer(function (req, res) {
res.writeHead(200, {'Content-Type' : 'text/plain'});
res.end('RSS Twitter Bot\n');
}).listen(5693);
var timeInterval = 300000; // run every 30m
var timerVar = setInterval (function () {runBot()}, timeInterval);
function runBot(){
var lastCompleted = Date.parse(new Date(0));
console.log(lastCompleted);
try {
var lastcompletedData = fs.readFileSync('./lastCompleted.json', 'utf8');
var timeData = JSON.parse(lastcompletedData);
var lastCompletedFromFile = Date.parse(new Date(timeData.lastCompleted));
if ( isNaN(lastCompletedFromFile) == false ) {
lastCompleted = lastCompletedFromFile;
}
} catch (e) {
console.log(e);
}
fs.readFile('./config.json', 'utf8', function (err, data) {
if (err) console.log(err); // we'll not consider error handling for now
var configData = JSON.parse(data);
console.log(configData);
var twitter = new simpleTwitter( configData.consumerKey //consumer key from twitter api
, configData.consumerSecret //consumer secret key from twitter api
, configData.accessToken //access token from twitter api
, configData.accessTokenSecret //access token secret from twitter api
, 3600);
var dateNow = Date.parse(new Date());
var FeedParser = require('feedparser');
var request = require('request');
var req = request(configData.feedUrl);
var feedparser = new FeedParser();
req.on('error', function (error) {
console.log(error);
});
req.on('response', function (res){
var stream = this;
if (res.statusCode != 200 ) return this.emit('error', new Error('Bad status code'));
stream.pipe(feedparser);
});
feedparser.on('error', function(error) {
console.log(error);
});
feedparser.on('readable', function() {
var stream = this;
var meta = this.meta;
var item;
while (item = stream.read()) {
var itemDate = Date.parse(item.date);
//check to not publish older articles
if (itemDate > lastCompleted){
var titleLength = item.title.length;
var itemTitle = item.title;
var itemLink = item.link;
if (titleLength > 100) {
itemTitle = itemTitle.substring(0, 100);
}
twitter.post('statuses/update'
, {'status' : itemTitle + ' ' + itemLink + " " + configData.tags}
, function (error, data) {
console.dir(data);
});
console.log(itemTitle + ' ' + item.link + configData.tags);
}
}
//TO KNOW WHEN FROM TO START POSTING
var dateCompleted = new Date();
console.log('loop completed at ' + dateCompleted);
var outputData = {
lastCompleted : dateCompleted
}
var outputFilename = './lastCompleted.json';
fs.writeFile(outputFilename, JSON.stringify(outputData, null, 4), function(err) {
if(err) {
console.log(err);
} else {
console.log("JSON saved to " + outputFilename);
}
});
});
});
}
And this is the TinyURL node.js module
var TinyURL = require('tinyurl');
TinyURL.shorten('http://google.com', function(res) {
console.log(res); //Returns a tinyurl
});
Changing the 'http://google.com' string to itemLink var works just fine and prints it in the terminal as expected.
TinyURL.shorten(itemLink, function(res) {
console.log(res); //Returns a tinyurl
});
What i'm trying to achieve is:
twitter.post('statuses/update', {'status' : itemTitle + ' ' + tinyurlLink + " " + configData.tags}
How can i get the response turned into a e.g var tinyurlLink to replace the itemLink var? Any help would be much appreciated!
As suggested by #zerkms sending a tweet from inside the TinyURL.shorten worked!
I'm currently trying to retrieve data from a sqlite query in node.js, the sql function is on a diferent file so i'm exporting it as a module and then call the function from the index.js. But when i try to retrieve the data the function returns a null value.
Here is my code
Index.js
var express = require("express");
var body_parser = require("body-parser");
var app = express();
var db = require('./dbhandler.js');
app.set("view engine", "jade");
app.get("/data",function(req,res){
let data = db.select();
res.send(data);
});
app.get("/",function(req,res){
res.render("index");
});
app.listen(8888);
dbhandler.js
var sqlite3 = require("sqlite3");
const file = "hr";
exports.select = function (){
var lista = [];
var db = new sqlite3.Database(file);
db.all("SELECT * FROM usuarios", function(err,rows){
let contador = 0;
rows.forEach(function (row) {
lista[contador] = row.nombre + ";" + row.cedula + ";" + row.edad + ";" + row.pais;
});
});
db.close();
return lista;
}
Node is asynchronous!!!. lista is returned from the module before the db.all function completes.
You either need to pass a callback into the select function or return a promise. The callback approach would look something like this:
exports.select = function (cb){
var lista = [];
var db = new sqlite3.Database(file);
db.all("SELECT * FROM usuarios", function(err,rows){
if(err) return cb(err);
let contador = 0;
rows.forEach(function (row) {
lista[contador] = row.nombre + ";" + row.cedula + ";" + row.edad + ";"
+ row.pais; });
db.close();
return cb(null, lists);
});
}
I am just learning server-side JavaScript so please bear with any glaring mistakes I've made.
I am trying to write a file parser that operates on HTML files in a directory and returns a JSON string once all files have been parsed. I started it with a single file and it works fine. it loads the resource from Apache running on the same machine, injects jquery, does the parsing and returns my JSON.
var request = require('request'),
jsdom = require('jsdom'),
sys = require('sys'),
http = require('http');
http.createServer(function (req, res) {
request({uri:'http://localhost/tfrohe/Car3E.html'}, function (error, response, body) {
if (!error && response.statusCode == 200) {
var window = jsdom.jsdom(body).createWindow();
jsdom.jQueryify(window, 'http://ajax.googleapis.com/ajax/libs/jquery/1.4.4/jquery.min.js', function (window, jquery) {
// jQuery is now loaded on the jsdom window created from 'body'
var emps = {};
jquery("tr td img").parent().parent().each(function(){
var step = 0;
jquery(this).children().each(function(index){
if (jquery(this).children('img').attr('src') !== undefined) {
step++;
var name = jquery(this).parent().next().next().children('td:nth-child('+step+')').children().children().text();
var name_parts = name.split(",");
var last = name_parts[0];
var name_parts = name_parts[1].split(/\u00a0/g);
var first = name_parts[2];
emps[last + ",_" + first] = jquery(this).children('img').attr('src');
}
});
});
emps = JSON.stringify(emps);
//console.log(emps);
res.writeHead(200, {'Content-Type': 'text/plain'});
res.end(emps);
});
} else {
res.writeHead(200, {"Content-Type": "text/plain"});
res.end("empty");
//console.log(response.statusCode);
}
});
}).listen(8124);
Now I am trying to extend this to using the regular file system (fs) and get all HTML files in the directory and parse them the same way and return a single combined JSON object once all files have been parsed. Here is what I have so far but it does not work.
var sys = require("sys"),
fs = require("fs"),
jsdom = require("jsdom"),
emps = {};
//path = '/home/inet/www/media/employees/';
readDirectory = function(path) {
fs.readdir(path, function(err, files) {
var htmlfiles = [];
files.forEach(function(name) {
if(name.substr(-4) === "html") {
htmlfiles.push(name);
}
});
var count = htmlfiles.length;
htmlfiles.forEach(function(filename) {
fs.readFile(path + filename, "binary", function(err, data) {
if(err) throw err;
window = jsdom.jsdom(data).createWindow();
jsdom.jQueryify(window, 'http://ajax.googleapis.com/ajax/libs/jquery/1.4.4/jquery.min.js', function (window, jquery) {
jquery("tr td img").parent().parent().each(function(){
var step = 0;
jquery(this).children().each(function(index){
if (jquery(this).children('img').attr('src') !== undefined) {
step++;
var empname = jquery(this).parent().next().next().children('td:nth-child('+step+')').children().children().text();
var name_parts = empname.split(",");
var last = name_parts[0];
var name_parts = name_parts[1].split(/\u00a0/g);
var first = name_parts[2]
emps[last + ",_" + first] = jquery(this).children('img').attr('src');
}
});
});
});
});
});
});
}
readDirectory('/home/inet/www/media/employees/', function() {
console.log(emps);
});
In this particular case, there are 2 html files in the directory. If i console.log(emps) during the htmlfiles.forEach() it shows me the results from the first file then the results for both files together the way I expect. how do I get emps to be returned to readDirectory so i can output it as desired?
Completed Script
After the answers below, here is the completed script with a httpServer to serve up the detail.
var sys = require('sys'),
fs = require("fs"),
http = require('http'),
jsdom = require('jsdom'),
emps = {};
var timed = setInterval(function() {
emps = {};
readDirectory('/home/inet/www/media/employees/', function(emps) {
});
}, 3600000);
readDirectory = function(path, callback) {
fs.readdir(path, function(err, files) {
var htmlfiles = [];
files.forEach(function(name) {
if(name.substr(-4) === "html") {
htmlfiles.push(name);
}
});
var count = htmlfiles.length;
htmlfiles.forEach(function(filename) {
fs.readFile(path + filename, "binary", function(err, data) {
if(err) throw err;
window = jsdom.jsdom(data).createWindow();
jsdom.jQueryify(window, 'http://ajax.googleapis.com/ajax/libs/jquery/1.4.4/jquery.min.js', function (window, jquery) {
var imagecount = jquery("tr td img").length;
jquery("tr td img").parent().parent().each(function(){
var step = 0;
jquery(this).children().each(function(index){
if (jquery(this).children('img').attr('src') !== undefined) {
step += 1;
var empname = jquery(this).parent().next().next().children('td:nth-child('+step+')').children().children().text();
var name_parts = empname.split(",");
var last = name_parts[0];
var name_parts = name_parts[1].split(/\u00a0/g);
var first = name_parts[2]
emps[last + ",_" + first] = jquery(this).children('img').attr('src');
}
});
});
count -= 1;
if (count <= 0) {
callback(JSON.stringify(emps));
}
});
});
});
});
}
var init = readDirectory('/home/inet/www/media/employees/', function(emps) {
});
http.createServer(function (req, res) {
res.writeHead(200, {'Content-Type': 'text/plain'});
res.end(JSON.stringify(emps));
}).listen(8124);
That sure is a lot of code a couple of mistakes.
You're never calling the callback function you supply to readDirectory
You need to keep track of the files you have parsed, when you parsed all of them, call the callback and supply the emps
This should work:
var sys = require("sys"),
fs = require("fs"),
jsdom = require("jsdom"),
//path = '/home/inet/www/media/employees/';
// This is a nicer way
function readDirectory(path, callback) {
fs.readdir(path, function(err, files) {
// make this local
var emps = {};
var htmlfiles = [];
files.forEach(function(name) {
if(name.substr(-4) === "html") {
htmlfiles.push(name);
}
});
// Keep track of the number of files we have parsed
var count = htmlfiles.length;
var done = 0;
htmlfiles.forEach(function(filename) {
fs.readFile(path + filename, "binary", function(err, data) {
if(err) throw err;
window = jsdom.jsdom(data).createWindow();
jsdom.jQueryify(window, 'http://ajax.googleapis.com/ajax/libs/jquery/1.4.4/jquery.min.js', function (window, jquery) {
jquery("tr td img").parent().parent().each(function(){
var step = 0;
jquery(this).children().each(function(index){
if (jquery(this).children('img').attr('src') !== undefined) {
step++;
var empname = jquery(this).parent().next().next().children('td:nth-child('+step+')').children().children().text();
var name_parts = empname.split(",");
var last = name_parts[0];
var name_parts = name_parts[1].split(/\u00a0/g);
var first = name_parts[2]
emps[last + ",_" + first] = jquery(this).children('img').attr('src');
}
});
});
// As soon as all have finished call the callback and supply emps
done++;
if (done === count) {
callback(emps);
}
});
});
});
});
}
readDirectory('/home/inet/www/media/employees/', function(emps) {
console.log(emps);
});
You seem to be doing this a tad wrong
readDirectory('/home/inet/www/media/employees/', function() {
console.log(emps);
});
But you've defined your function as:
readDirectory = function(path) {
Where is the callback argument? Try this:
readDirectory = function(path, callback) {
then under emps[last + ",_" + first] = jquery(this).children('img').attr('src'); put
callback.call(null, emps);
Your callback function will be called however many times your loop goes on for. If you want it to return all of them at once, you'll need to get a count of how many times the loop is going to run for, count up until that number then call your callback when the emps array is full of the data you need.