Carlos Roman carlochess

This article has been given a more permanent home on my blog. Also, since it was first written, the development of the Promises/A+ specification has made the original emphasis on Promises/A seem somewhat outdated.

You're Missing the Point of Promises

Promises are a software abstraction that makes working with asynchronous operations much more pleasant. In the most basic definition, your code will move from continuation-passing style:

getTweetsFor("domenic", function (err, results) {
 // the rest of your code goes here.

How to setup your own CA with OpenSSL

For educational reasons I've decided to create my own CA. Here is what I learned.

First things first

Lets get some context first.

LInux

Three system configuration parameters must be set to support a large number of open files and TCP connections with large bursts of messages. Changes can be made using the /etc/rc.d/rc.local or /etc/sysctl.conf script to preserve changes after reboot.

1. /proc/sys/fs/file-max: The maximum number of concurrently open files.

fs.file-max = 1000000

2. /proc/sys/net/ipv4/tcp_max_syn_backlog: Maximum number of remembered connection requests, which are still did not receive an acknowledgment from connecting client. The default value is 1024 for systems with more than 128Mb of memory, and 128 for low memory machines.

net.ipv4.tcp_max_syn_backlog = 3240000

3. /proc/sys/net/core/somaxconn: Limit of socket listen() backlog, known in userspace as SOMAXCONN. Defaults to 128.

net.core.somaxconn = 3240000

A quick overview of the node.js streams interface with basic examples.

This is based on @brycebaril's presentation, Node.js Streams2 Demystified

Overview

Streams are a first-class construct in Node.js for handling data.

Think of them as as lazy evaluation applied to data.

Dynamic Dispatch
Dynamic Method
Ghost Methods
Dynamic Proxies
Blank Slate
Kernel Method
Flattening the Scope (aka Nested Lexical Scopes)
Context Probe
Class Eval (not really a 'spell' more just a demonstration of its usage)
Class Macros

Initialize

gitflow	git
`git flow init`	`git init`
	`git commit --allow-empty -m "Initial commit"`
	`git checkout -b develop master`

	#!/usr/bin/env python
	#
	# Proof of Concept: UDP Hole Punching
	# Two client connect to a server and get redirected to each other.
	#
	# This is the client.
	#
	# Koen Bollen <meneer koenbollen nl>
	# 2010 GPL
	#

	#include <sys/epoll.h>
	#include <fcntl.h>
	#include <string.h>

	#include "chicken.h"

	#define MAX_EVENTS 24

	extern void SCM_epoll_wait_cb(C_word vec);

	#!/usr/bin/env python

	import socket
	import random
	import itertools
	import sys

	HOSTS=["www.bbc.co.uk", "guardian.co.uk", "dailymail.co.uk", "reddit.com"]

	request = '''

	#!/bin/bash
	# This script will help you setup Docker for TLS authentication.
	# Run it passing in the arguement for the FQDN of your docker server
	#
	# For example:
	# ./create-docker-tls.sh myhost.docker.com
	#
	# The script will also create a profile.d (if it exists) entry
	# which configures your docker client to use TLS
	#