Wait until all the callbacks have been executed and then exit

Question

Wait until all the callbacks have been executed and then exit

EDIT: This seems impossible to do because the createWriteStream() and other error emitters doesn't necessarily emit errors at the next tick, so this wait cannot be done. Actually, if I shutdown() that means that I want to finish the process immediately, so it's ok if I don't get any error.

var fs = require ("fs");
var s;

var init = function (cb){
    cb ();
};

var shutdown = function (cb){
    cb (wait);
};

var wait = function (){
    //Some kind of wait
    process.exit ();
};

init (function (){
    s = fs.createWriteStream ("?invalid").on ("error", console.error); //This emits an error
});

shutdown (function (cb){
    s.on ("close", function (error){
        if (error) console.error (error);
        cb ();
    });
    s.end ();
    cb ();
});

If you execute this code you won't get any error because the process is finished before the error is printed. If you change the wait() function to this,

var wait = function (){
    //Some kind of wait
    setTimeout (function (){
        process.exit ();
    }, 1000);
};

the error is printed and after 1s the process finishes. I want to wait to the error callback and then exit without setting a timer. I've tried with nextTick() but doesn't work.

node.js

Answer 1

Here's a simplified version of what you're trying to achieve:

var fs = require ("fs");
var s;

var init = function (cb){
    cb ();
};

var shutdown = function(error){
    console.log(error);
    process.exit();
};

init(function (){

    s = fs.createWriteStream("?invalid");
    s.on("error", shutdown);
    s.on ("close", shutdown);

});