Question

Does any one Has every configure nack for the Rails Projects I happen to tried the dummy code

var http = require('http'); 
var nack = require('nack');
var app = nack.createProcess("/home/viren/myapp/config.ru");
http.createServer(function (req, res) {   app.proxy(req, res); }).listen(8124, "127.0.0.1");

but it reported me with the following error

events.js:94

throw new Error(‘addListener only takes instances of Function’);

^ Error: addListener only takes instances of Function

at BufferedRequest. (events.js:94:11)

at Process. (/home/viren/node_modules/nack/lib/process.js:257:21)

at Process.proxy (/home/viren/node_modules/nack/lib/process.js:3:63)

at Server. (/home/viren/simple.proxy.js:7:7)

at Server.emit (events.js:67:17)

at HTTPParser.onIncoming (http.js:1124:12)

at HTTPParser.onHeadersComplete (http.js:108:31)

at Socket.ondata (http.js:1019:22)

at Socket._onReadable (net.js:683:27)

at IOWatcher.onReadable [as callback] (net.js:177:10)

here is my custom rack-file

require "config/environment"

use Rails::Rack::LogTailer
use ActionDispatch::Static
run ActionController::Dispatcher.new

Answer 1

According the source at node_modules/nack/lib/process.js:257 nack is expecting app.proxy to have a signature of app.proxy(req, res, next) with is a common idiom with connect apps. In connect, calling next(“some value”) is a convention as most apps have a catch all error handler at the bottom of the middleware chain. Since your not using connect, just create your own error handler.

I also created a pull request, so hopefully using next will be optional in the future. https://github.com/josh/nack/pull/25

var http = require('http'); var nack = require('nack');

var app = nack.createProcess("/home/viren/myapp/config.ru");

http.createServer(function (req, res) { app.proxy(req, res, logNackError); }).listen(8124, "127.0.0.1");

function logNackError(err) {
  console.log('nack error:', err);
}