Charlie Robbins indexzero

## domains.md

      
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                indexzero
                / domains.md
            
            
              Created
              March 15, 2013 22:15
            
          
    Node Error Handling and Domains

"Occurrences in this domain are beyond the reach of exact prediction because of the variety of factors in operation, not because of any lack of order in nature." - Albert Einstein

"Master of my domain" - Larry David

Error handling in an asynchronous language works in a unique way and presents many challenges, some unexpected. This tutorial reviews the various error handling patterns available in node, and explains how domains can be used to improve it.
There are four main error handling patterns in node:

Error return value


## range-error-ftw.js
var a = [];

a[Math.pow(2, 32) - 2] = "max index";                 // highest non-expando indexed property
console.log(a.length === Math.pow(2, 32) - 1);        // true

try {
    a.push("whoa", "EVEN MOAR WHOA");
} catch (e) {
    console.log(e instanceof RangeError);             // true
}

## index.html
<!DOCTYPE HTML>
<html>
<head>
    <title>XKCD plots in d3</title>

    <script src="http://d3js.org/d3.v2.min.js?2.10.0"></script>
    <script src="xkcd.js"></script>

<style>

## LICENSE.txt
            DO WHAT THE FUCK YOU WANT TO PUBLIC LICENSE
                    Version 2, December 2004

 Copyright (C) 2011 YOUR_NAME_HERE <YOUR_URL_HERE>

 Everyone is permitted to copy and distribute verbatim or modified
 copies of this license document, and changing it is allowed as long
 as the name is changed.

            DO WHAT THE FUCK YOU WANT TO PUBLIC LICENSE

## gist:3299220

      
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                indexzero
                / gist:3299220
            
            
              Created
              August 8, 2012 22:04
                — forked from Marak/gist:3240974
            
              
                WIP - Flatironisms
              
          
    WIP

log all incoming http requests

app.http.before.push(function(req, res){
  app.log.info(req.url);
  res.emit('next');
})

  
## seal.js
#!/usr/bin/env node

/*
 * This module can verify that packages installed during development are
 * identical to those installed during deployment. The standard npm shrinkwrap
 * only ensures that package versions are the same, but does not verify contents.
 * This module checks the shasum of the package tarballs downloaded by npm during
 * development and deployment to ensure they are the same.
 *
 * Usage:

## node-static-test.js
var vows = require('vows')
	, request = require('request')
	, assert = require('assert')
	, httpMocks = require('node-mocks-http')
		static = require('../../lib/node-static');

var fileServer = new(static.Server)(__dirname + '/../fixtures', {});

var suite = vows.describe('file-server.js');

## example-user.js
  var user = {
    validateCredentials: function (username, password) {
      return (
          (!(username += '') || username === '') ? { error: "No Username Given.", field: 'name' }
        : (!(username += '') || password === '') ? { error: "No Password Given.", field: 'pass' }
        : (username.length < 3)                  ? { error: "Username is less than 3 Characters.", field: 'name' }
        : (password.length < 4)                  ? { error: "Password is less than 4 Characters.", field: 'pass' }
        : (!/^([a-z0-9-_]+)$/i.test(username))   ? { error: "Username contains invalid characters.", field: 'name' }
        : false
      );

## gist:2331488
function toString (obj) {
  function _toString (i) {
    if (obj[i] === null) return 'null'
    if (typeof obj[i] === 'undefined') return 'undefined'
    if (obj[i].toString) return obj[i].toString()
    else return ''
  }
  return _toString
}

## app.js
var flatiron = require('flatiron'),
    app = flatiron.app;

console.log('What\'s that in your hand? Look down,');
app.use(require('./tickets'));

console.log('look up. I HAVE IT. It\'s ' + app.qty + ' TICKETS to ' + app.description + '!');

console.log('Look again.');
app.use(require('./diamonds'));
	var a = [];

	a[Math.pow(2, 32) - 2] = "max index"; // highest non-expando indexed property
	console.log(a.length === Math.pow(2, 32) - 1); // true

	try {
	a.push("whoa", "EVEN MOAR WHOA");
	} catch (e) {
	console.log(e instanceof RangeError); // true
	}
	<!DOCTYPE HTML>
	<html>
	<head>
	<title>XKCD plots in d3</title>

	<script src="http://d3js.org/d3.v2.min.js?2.10.0"></script>
	<script src="xkcd.js"></script>

	<style>
	DO WHAT THE FUCK YOU WANT TO PUBLIC LICENSE
	Version 2, December 2004

	Copyright (C) 2011 YOUR_NAME_HERE <YOUR_URL_HERE>

	Everyone is permitted to copy and distribute verbatim or modified
	copies of this license document, and changing it is allowed as long
	as the name is changed.

	DO WHAT THE FUCK YOU WANT TO PUBLIC LICENSE
	#!/usr/bin/env node

	/*
	* This module can verify that packages installed during development are
	* identical to those installed during deployment. The standard npm shrinkwrap
	* only ensures that package versions are the same, but does not verify contents.
	* This module checks the shasum of the package tarballs downloaded by npm during
	* development and deployment to ensure they are the same.
	*
	* Usage:
	var vows = require('vows')
	, request = require('request')
	, assert = require('assert')
	, httpMocks = require('node-mocks-http')
	static = require('../../lib/node-static');

	var fileServer = new(static.Server)(__dirname + '/../fixtures', {});

	var suite = vows.describe('file-server.js');
	var user = {
	validateCredentials: function (username, password) {
	return (
	(!(username += '') \|\| username === '') ? { error: "No Username Given.", field: 'name' }
	: (!(username += '') \|\| password === '') ? { error: "No Password Given.", field: 'pass' }
	: (username.length < 3) ? { error: "Username is less than 3 Characters.", field: 'name' }
	: (password.length < 4) ? { error: "Password is less than 4 Characters.", field: 'pass' }
	: (!/^([a-z0-9-_]+)$/i.test(username)) ? { error: "Username contains invalid characters.", field: 'name' }
	: false
	);
	function toString (obj) {
	function _toString (i) {
	if (obj[i] === null) return 'null'
	if (typeof obj[i] === 'undefined') return 'undefined'
	if (obj[i].toString) return obj[i].toString()
	else return ''
	}
	return _toString
	}
	var flatiron = require('flatiron'),
	app = flatiron.app;

	console.log('What\'s that in your hand? Look down,');
	app.use(require('./tickets'));

	console.log('look up. I HAVE IT. It\'s ' + app.qty + ' TICKETS to ' + app.description + '!');

	console.log('Look again.');
	app.use(require('./diamonds'));