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/ answers: 1 / hits: 46081
/ 10 Years ago, tue, january 13, 2015, 12:00:00
Say if I have a structure in Node.js shown below:
for (i = 0; i < 50; i++) {
//Doing a for loop.
}
function after_forloop() {
//Doing a function.
}
after_forloop();
So how could I make sure the after_forloop() function is fired after the forloop is completed?
In case if you want to see what I am actually working on:
var http = require('http');
http.createServer(function (req, res) {
res.writeHead(200, {'Content-Type': 'text/plain'});
res.end('Hello Worldn');
}).listen(1337, '127.0.0.1');
console.log('Server running at http://127.0.0.1:1337/');
var proxyChecker = require('proxy-checker');
var fs = require('fs');
function get_line(filename, line_no, callback) {
fs.readFile(filename, function (err, data) {
if (err) throw err;
var lines = data.toString('utf-8').split(n);
var firstLineBreak = data.toString('utf-8').indexOf(n);
var originalText = data.toString('utf-8');
var newText = originalText.substr(firstLineBreak + 1);
if(+line_no > lines.length){
return callback('File end reached without finding line', null);
}
callback(null, lines[+line_no], newText);
});
}
for (i = 0; i < 50; i++) {
get_line('proxy_full.txt', i, function(err, line, newText){
fs.appendFile('proxy.txt', line + 'n', function (err) {
if (err) throw err;
});
fs.writeFile('proxy_full.txt', newText, function (err) {
if (err) throw err;
});
})
}
after_forloop();
function after_forloop() {
proxyChecker.checkProxiesFromFile(
// The path to the file containing proxies
'proxy.txt',
{
// the complete URL to check the proxy
url: 'http://google.com',
// an optional regex to check for the presence of some text on the page
regex: /.*/
},
// Callback function to be called after the check
function(host, port, ok, statusCode, err) {
if (ok) {
console.log(host + ':' + port);
fs.appendFile('WorkingProxy.txt', host + ':' + port + 'n', function (err) {
if (err) throw err;
});
}
}
);
setTimeout(function(){
fs.writeFile('proxy.txt', , function (err) {
if (err) throw err;
});
console.log('Proxy Check Completed.')
process.exit(1);
}, 5000);
}
Basically I like to allow the node server run 50 test on a list proxy servers at a time (within five seconds). And then the server should save the working proxies to a new file.
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