Creating custom stream in nodejs

Question

I'm trying to add ping results (isAlive) to the stream below so that later I can pipe to http response but I received the following error

events.js:85
throw er; // Unhandled 'error' event

I don't understand what it means and would be grateful for any help afforded to me?

var Readable = require('stream').Readable;
var s = new Readable;
var ping = require('ping');

var hosts = ['192.168.1.1', 'google.com', 'yahoo.com'];
hosts.forEach(function(host){
    ping.sys.probe(host, function(isAlive){
        var msg = isAlive ? 'host ' + host + ' is alive' : 'host ' + host + ' is dead';
        //console.log(msg);
        s.push(msg)
    });
});
//s.push(null) ;
//s.pipe(process.stdout);

Which version of node are you using?

Chance
– Chance

2015-09-28 15:22:27 +00:00
Commented Sep 28, 2015 at 15:22 — Chance
– Chance, Commented Sep 28, 2015 at 15:22

Chance · Accepted Answer · 2015-09-29 02:13:10Z

1

I modified your code:

var Readable = require('stream').Readable;
var s = new Readable();
var ping = require('ping');

s.on('error', function(err){
  console.error(err)
})

var hosts = ['192.168.1.1', 'google.com', 'yahoo.com'];
hosts.forEach(function(host){
    ping.sys.probe(host, function(isAlive){
        var msg = isAlive ? 'host ' + host + ' is alive' : 'host ' + host + ' is dead';
        //console.log(msg);
        s.push(msg);
    })
});

You were missing the () on var s = new Readable()

By adding the error listener to your reader, you'll see that the tool you're using is throwing the following error: Error: not implemented

Sorry, I thought I had sent this earlier. Fortunately stack saves unsubmitted posts.

answered Sep 29, 2015 at 2:13

Chance

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